UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE TO

TENDER OFFER STATEMENT UNDER SECTION 14(d)(1) or 13(e)(1) OF THE SECURITIES EXCHANGE ACT OF 1934

Corcept Therapeutics Incorporated

(Name of Subject Company (Issuer) and Filing Person (Offeror))

Common Stock, $0.001 par value

(Title of Class of Securities)

218352102

(CUSIP Number of Class of Securities)

Atabak Mokari

Chief Financial Officer

Corcept Therapeutics Incorporated

149 Commonwealth Drive

Menlo Park, CA 94025

(650) 327-3270

(Name, address and telephone number of person authorized to receive notices and communications on behalf of filing person)

Copy to:

Jeffrey T. Hartlin

Samantha Eldredge

Paul Hastings LLP

1117 S. California Avenue

Palo Alto, CA 94034

Telephone: (650) 320-1800

Facsimile: (650) 320-1900

Check the appropriate boxes below to designate any transactions to which the statement relates:

Check the following box if the filing is a final amendment reporting the results of the tender offer:  ☐

If applicable, check the appropriate box(es) below to designate the appropriate rule provision(s) relied upon:

SCHEDULE TO

This Tender Offer Statement on Schedule TO relates to the offer by Corcept Therapeutics Incorporated, a Delaware corporation (“Corcept” or the “Company”), to purchase up to 7,500,000 shares of its common stock, par value $0.001 per share (the “Shares”), at a price not greater than $22.00 nor less than $19.25 per Share, as defined in the Offer to Purchase (defined below), to the seller in cash, less any applicable withholding taxes and without interest. The Company’s offer is being made upon the terms and subject to the conditions set forth in the Offer to Purchase, dated March 6, 2023 (together with any amendments or supplements thereto, the “Offer to Purchase”), the related Letter of Transmittal (together with any amendments or supplements thereto, the “Letter of Transmittal”) and other related materials as may be amended or supplemented from time to time (collectively, with the Offer to Purchase and the Letter of Transmittal, the “Tender Offer”). This Tender Offer Statement on Schedule TO is intended to satisfy the reporting requirements of Rule 13e-4(c)(2) under the Securities Exchange Act of 1934, as amended.

The information in the Offer to Purchase and the Letter of Transmittal, copies of which are filed with this Schedule TO as Exhibits (a)(1)(A) and (a)(1)(B), respectively, are incorporated by reference in answer to Items 1 through 11 in this Tender Offer Statement on Schedule TO.

The information set forth in the section captioned “Summary Term Sheet” of the Offer to Purchase, a copy of which is filed with this Schedule TO as Exhibit (a)(1)(A), is incorporated herein by reference.

(a) Name and Address: The name of the subject company is Corcept Therapeutics Incorporated, a Delaware corporation. The address and telephone number of its principal executive offices are: 149 Commonwealth Drive, Menlo Park, CA 94025 (650-327-3270). The information set forth in Section 11 (“Certain Information Concerning Us”) of the Offer to Purchase is incorporated herein by reference.

(b) Securities: The information set forth in the section of the Offer to Purchase captioned “Introduction” and in Section 12 (“Interests of Directors and Executive Officers; Transactions and Arrangements Concerning the Shares”) of the Offer to Purchase is incorporated herein by reference.

(c) Trading Market and Price: The information set forth in the section of the Offer to Purchase captioned “Introduction” and Section 8 (“Price Range of Shares; Dividends”) of the Offer to Purchase is incorporated herein by reference.

(a) Name and Address: The name of the filing person is Corcept Therapeutics Incorporated, a Delaware corporation. The address and telephone number of its principal executive offices are: 149 Commonwealth Drive, Menlo Park, CA 94025 (650-327-3270). The information set forth in Section 11 (“Certain Information Concerning Us”) and Section 12 (“Interests of Directors and Executive Officers; Transactions and Arrangements Concerning the Shares”) of the Offer to Purchase and in Schedule I to the Offer to Purchase is incorporated herein by reference.

(a) Material Terms: The information set forth in the sections of the Offer to Purchase captioned “Introduction” and “Summary Term Sheet,” and in Section 1 (“Number of Shares; Price; Proration”), Section 2 (“Purpose of the

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Offer; Certain Effects of the Offer; Plans and Proposals”), Section 3 (“Procedures for Tendering Shares”), Section 4 (“Withdrawal Rights”), Section 5 (“Purchase of Shares and Payment of Purchase Price”), Section 6 (“Conditional Tender of Shares”), Section 7 (“Conditions of the Offer”), Section 10 (“Source and Amount of Funds”), Section 12 (“Interests of Directors and Executive Officers; Transactions and Arrangements Concerning the Shares”), Section 14 (“Certain U.S. Federal Income Tax Considerations”), Section 15 (“Extension of the Offer; Termination; Amendment”) and Section 17 (“Miscellaneous”) of the Offer to Purchase is incorporated herein by reference.

(b) Purchases: The information set forth in Section 12 (“Interests of Directors and Executive Officers; Transactions and Arrangements Concerning the Shares”) of the Offer to Purchase is incorporated herein by reference.

(a) Agreements Involving the Subject Company’s Securities: The information set forth in Section 12 (“Interests of Directors and Executive Officers; Transactions and Arrangements Concerning the Shares”) of the Offer to Purchase is incorporated herein by reference.

(a) Purposes: The information set forth in the section of the Offer to Purchase captioned “Summary Term Sheet” and in Section 2 (“Purpose of the Offer; Certain Effects of the Offer; Plans and Proposals”) of the Offer to Purchase is incorporated herein by reference.

(b) Use of the Securities Acquired: The information set forth in Section 2 (“Purpose of the Offer; Certain Effects of the Offer; Plans and Proposals”) of the Offer to Purchase is incorporated herein by reference.

(c) Plans: The information set forth in Section 2 (“Purpose of the Offer; Certain Effects of the Offer; Plans and Proposals”) of the Offer to Purchase is incorporated herein by reference.

(a) Source of Funds: The information set forth in the section of the Offer to Purchase captioned “Summary Term Sheet” and in Section 10 (“Source and Amount of Funds”) of the Offer to Purchase is incorporated herein by reference.

(b) Conditions: The information set forth in the section of the Offer to Purchase captioned “Summary Term Sheet” and in Section 10 (“Source and Amount of Funds”) of the Offer to Purchase is incorporated herein by reference.

(c) Borrowed Funds: The information set forth in the section of the Offer to Purchase captioned “Summary Term Sheet” and in Section 10 (“Source and Amount of Funds”) of the Offer to Purchase is incorporated herein by reference.

(a) Securities Ownership: The information set forth in Section 12 (“Interests of Directors and Executive Officers; Transactions and Arrangements Concerning the Shares”) of the Offer to Purchase is incorporated herein by reference.

(b) Securities Transactions: The information set forth in Section 12 (“Interests of Directors and Executive Officers; Transactions and Arrangements Concerning the Shares”) of the Offer to Purchase is incorporated herein by reference.

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(a) Solicitations or Recommendations: The information set forth in Section 16 (“Fees and Expenses”) of the Offer to Purchase is incorporated herein by reference.

(a) and (b) Not applicable.

(a) Agreements, Regulatory Requirements and Legal Proceedings: The information set forth in Section 2 (“Purpose of the Offer; Certain Effects of the Offer; Plans and Proposals”), Section 12 (“Interests of Directors and Executive Officers; Transactions and Arrangements Concerning the Shares”) and Section 13 (“Certain Legal Matters; Regulatory Approvals”) of the Offer to Purchase is incorporated herein by reference.

(b) Other Material Information: The information in the Offer to Purchase and the Letter of Transmittal, copies of which are filed with this Schedule TO as Exhibits (a)(1)(A) and (a)(1)(B), respectively, is incorporated herein by reference.

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Not applicable.

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SIGNATURE

After due inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

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INDEX TO EXHIBITS

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EXHIBIT (a)(1)(A)

Offer to Purchase

by

Corcept Therapeutics Incorporated

Up to 7,500,000 Shares of its Common Stock

At a Cash Purchase Price Not Greater than $22.00 per Share Nor Less than $19.25 per Share

CUSIP: 218352102

Corcept Therapeutics Incorporated, a Delaware corporation (the “Company,” “Corcept,” “we,” “us” or “our”), invites our stockholders to tender up to 7,500,000 shares of our issued and outstanding shares of common stock, par value $0.001 per share (each, a “Share,” and collectively, “Shares”), for purchase by us at a price calculated as described herein that is a price not greater than $22.00 nor less than $19.25 per Share to the seller in cash, less any applicable withholding taxes and without interest, upon the terms and subject to the conditions described in this Offer to Purchase (together with any amendments or supplements thereto, the “Offer to Purchase”), in the related Letter of Transmittal (together with any amendments or supplements thereto, the “Letter of Transmittal”) and in other related materials as may be amended or supplemented from time to time (collectively, with the Offer to Purchase and Letter of Transmittal, the “Offer”).

Upon the terms and subject to the conditions of the Offer, we will determine a single per Share price that we will pay for Shares properly tendered and not properly withdrawn from the Offer, taking into account the total number of Shares properly tendered and the prices specified, or deemed specified, by tendering stockholders. This single per Share price (the “Final Purchase Price”) will be the lowest single purchase price, not greater than $22.00 nor less than $19.25 per Share, that would allow us to purchase (i) 7,500,000 Shares, if 7,500,000 or more Shares are properly tendered and not properly withdrawn, or (ii) all Shares properly tendered and not properly withdrawn in the event that less than 7,500,000 Shares are properly tendered and not properly withdrawn.

Upon the terms and subject to the conditions of the Offer, if 7,500,000 Shares or less are properly tendered and not properly withdrawn, we will purchase all Shares properly tendered at or below the Final Purchase Price and not properly withdrawn prior to the Expiration Date. All Shares acquired, if any, in the Offer will be acquired at the Final Purchase Price, including those Shares tendered at a price lower than the Final Purchase Price. Only Shares properly tendered at prices at or below the Final Purchase Price, and not properly withdrawn, will be purchased. However, because of proration, “Odd Lot” priority and the conditional tender provisions described in this Offer to Purchase, we may not purchase all of the Shares tendered at or below the Final Purchase Price if more than 7,500,000 Shares are properly tendered and not properly withdrawn. Shares not purchased in the Offer will be returned to the tendering stockholders promptly after the Expiration Date.

We reserve the right, in our sole discretion, to change the per Share purchase price range and to increase or decrease the number of Shares sought in the Offer, subject to applicable law. In accordance with the rules of the Securities and Exchange Commission (the “SEC”), if more than 7,500,000 Shares are tendered in the Offer at or below the Final Purchase Price, we may increase the number of Shares accepted for payment in the Offer by no more than 2% of the outstanding Shares without extending the Offer. See Section 1.

THE OFFER IS CONDITIONED ON AT LEAST 3,000,000 SHARES BEING TENDERED. THE OFFER IS ALSO SUBJECT TO CERTAIN OTHER CONDITIONS. SEE SECTION 7.

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The Shares are listed and traded on The Nasdaq Stock Market (“Nasdaq”) under the trading symbol “CORT.” On March 3, 2023, one trading day prior to the commencement of the Offer, the last reported sale price of the Shares was $19.20 per Share. Stockholders are urged to obtain current market quotations for the Shares before deciding whether and at what purchase price or purchase prices to tender their Shares. See Section 8.

OUR BOARD OF DIRECTORS HAS AUTHORIZED US TO MAKE THE OFFER. HOWEVER, NONE OF THE COMPANY, THE MEMBERS OF OUR BOARD OF DIRECTORS, PIPER SANDLER & CO. (THE “DEALER MANAGER”), D.F. KING & CO., INC., THE INFORMATION AGENT FOR THE OFFER (THE “INFORMATION AGENT”), OR CONTINENTAL STOCK TRANSFER & TRUST COMPANY, THE DEPOSITARY FOR THE OFFER (THE “DEPOSITARY”), MAKES ANY RECOMMENDATION TO YOU AS TO WHETHER YOU SHOULD TENDER OR REFRAIN FROM TENDERING YOUR SHARES OR AS TO THE PURCHASE PRICE OR PURCHASE PRICES AT WHICH YOU MAY CHOOSE TO TENDER YOUR SHARES. NEITHER WE NOR ANY MEMBER OF OUR BOARD OF DIRECTORS, THE DEALER MANAGER, THE INFORMATION AGENT OR THE DEPOSITARY HAS AUTHORIZED ANY PERSON TO MAKE ANY RECOMMENDATION WITH RESPECT TO THE OFFER. YOU MUST MAKE YOUR OWN DECISION AS TO WHETHER TO TENDER YOUR SHARES AND, IF SO, HOW MANY SHARES TO TENDER AND THE PURCHASE PRICE OR PURCHASE PRICES AT WHICH YOU WILL TENDER THEM. WE RECOMMEND THAT YOU CONSULT YOUR OWN FINANCIAL AND TAX ADVISORS, AND READ CAREFULLY AND EVALUATE THE INFORMATION IN THIS OFFER TO PURCHASE AND IN THE LETTER OF TRANSMITTAL, INCLUDING OUR REASONS FOR MAKING THE OFFER, BEFORE TAKING ANY ACTION WITH RESPECT TO THE OFFER. SEE SECTION 2.

THE OFFER HAS NOT BEEN APPROVED BY THE SEC OR ANY STATE SECURITIES COMMISSION NOR HAS THE SEC OR ANY STATE SECURITIES COMMISSION PASSED UPON THE FAIRNESS OR MERITS OF THE OFFER OR UPON THE ACCURACY OF THE INFORMATION CONTAINED IN THIS OFFER TO PURCHASE AND ANY RELATED DOCUMENTS, AND ANY REPRESENTATION TO THE CONTRARY IS UNLAWFUL AND MAY BE A CRIMINAL OFFENSE.

If you have questions or need assistance, you should contact the Information Agent, or the Dealer Manager at their respective addresses and telephone numbers set forth on the back cover of this Offer to Purchase. If you require additional copies of this Offer to Purchase, the Letter of Transmittal, the Notice of Guaranteed Delivery or other related materials, you should contact the Information Agent.

The Dealer Manager for the Offer is:

Piper Sandler & Co.

Piper Sandler & Co.

800 Nicollet Mall

Minneapolis, Minnesota 55402

Direct: Mark Cieciura

Email: Mark.cieciura@psc.com

(312) 267-5100

Offer to Purchase dated March 6, 2023

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IMPORTANT

If you want to tender all or part of your Shares, you must do one of the following before the Offer expires at one minute after 11:59 P.M., New York City time, on March 31, 2023 (unless the Offer is extended):

If you wish to tender your Shares, but (a) the certificates for your Shares are not immediately available or cannot be delivered to the Depositary by the Expiration Date, (b) you cannot comply with the procedures for book-entry transfer by the Expiration Date, or (c) your other required documents cannot be delivered to the Depositary by the Expiration Date, you can still tender your Shares if you comply with the guaranteed delivery procedures described in Section 3.

If you wish to maximize the chance that your Shares will be purchased in the Offer, you should check the box in the section of the Letter of Transmittal captioned “Shares Tendered At Price Determined Under The Offer.” If you agree to accept the Final Purchase Price determined in the Offer, your Shares will be deemed to be tendered at $19.25 per Share, which is the low end of the price range in the Offer. You should understand that this election may lower the Final Purchase Price and could result in your Shares being purchased at $19.25 per Share, which is the low end of the price range in the Offer, less any applicable withholding taxes and without interest. The low end of the price range in the Offer could be below the last reported sale price of the Shares on Nasdaq on the Expiration Date.

We are not making the Offer to, and will not accept any tendered Shares from, stockholders in any jurisdiction where it would be illegal to do so. However, we may, at our discretion and subject to applicable law, take any actions necessary for us to make the Offer to stockholders in any such jurisdiction.

You may contact the Information Agent, the Dealer Manager or your broker, dealer, commercial bank, trust company or other nominee for assistance. The contact information for the Information Agent and the Dealer Manager is set forth on the back cover of this Offer to Purchase.

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OUR BOARD OF DIRECTORS HAS AUTHORIZED US TO MAKE THE OFFER. HOWEVER, NONE OF THE COMPANY, THE MEMBERS OF OUR BOARD OF DIRECTORS, THE DEALER MANAGER, THE INFORMATION AGENT OR THE DEPOSITARY HAS MADE ANY RECOMMENDATION AS TO WHETHER YOU SHOULD TENDER OR REFRAIN FROM TENDERING YOUR SHARES OR AS TO THE PURCHASE PRICE OR PURCHASE PRICES AT WHICH YOU MAY CHOOSE TO TENDER YOUR SHARES. NONE OF THE COMPANY, THE MEMBERS OF OUR BOARD OF DIRECTORS, THE DEALER MANAGER, THE INFORMATION AGENT OR THE DEPOSITARY HAS AUTHORIZED ANY PERSON TO MAKE ANY RECOMMENDATION ON OUR BEHALF AS TO WHETHER YOU SHOULD TENDER OR REFRAIN FROM TENDERING YOUR SHARES OR AS TO THE PURCHASE PRICE OR PURCHASE PRICES AT WHICH YOU MAY CHOOSE TO TENDER YOUR SHARES. NONE OF THE COMPANY, THE MEMBERS OF OUR BOARD OF DIRECTORS, THE DEALER MANAGER, THE INFORMATION AGENT OR THE DEPOSITARY HAS AUTHORIZED ANY PERSON TO GIVE ANY INFORMATION OR TO MAKE ANY REPRESENTATION IN CONNECTION WITH THE OFFER OTHER THAN THOSE CONTAINED IN THIS OFFER TO PURCHASE OR IN THE LETTER OF TRANSMITTAL. YOU SHOULD NOT RELY ON ANY RECOMMENDATION, OR ANY SUCH REPRESENTATION OR INFORMATION, AS HAVING BEEN AUTHORIZED BY US, ANY MEMBER OF OUR BOARD OF DIRECTORS, THE DEALER MANAGER, THE INFORMATION AGENT OR THE DEPOSITARY.

THE STATEMENTS MADE IN THIS OFFER TO PURCHASE ARE MADE AS OF THE DATE ON THE COVER PAGE, AND THE STATEMENTS INCORPORATED BY REFERENCE ARE MADE AS OF THE DATE OF THE DOCUMENTS INCORPORATED BY REFERENCE. THE DELIVERY OF THIS OFFER TO PURCHASE AND THE RELATED LETTER OF TRANSMITTAL SHALL NOT UNDER ANY CIRCUMSTANCES CREATE ANY IMPLICATION THAT THE INFORMATION CONTAINED HEREIN OR INCORPORATED BY REFERENCE IS CORRECT AS OF A LATER DATE OR THAT THERE HAS NOT BEEN ANY CHANGE IN SUCH INFORMATION OR IN OUR AFFAIRS SINCE SUCH DATES.

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TABLE OF CONTENTS

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SUMMARY TERM SHEET

We are providing this summary term sheet for your convenience. The information contained in this Summary Term Sheet is a summary only and is not meant to be a substitute for the more detailed description and information contained in the remainder of this Offer to Purchase (together with any amendments or supplements thereto, the “Offer to Purchase”), the accompanying Letter of Transmittal (together with any amendments or supplements thereto, the “Letter of Transmittal”), and other related materials as may be amended or supplemented from time to time (collectively, with the Offer to Purchase and Letter of Transmittal, the “Offer”). To understand the Offer fully and for a more complete description of the terms of the Offer, we urge you to read carefully this Offer to Purchase, the Letter of Transmittal and the other related materials that constitute part of the Offer in their entirety. We have included references to the sections of this Offer to Purchase where you will find a more complete description of the topics in this summary.

Who is offering to purchase my Shares?

The issuer of the Shares, Corcept Therapeutics Incorporated, a Delaware corporation (the “Company,” “Corcept,” “we,” “us” or “our”), is offering to purchase the Shares (as defined below). See Section 1.

What is Corcept offering to purchase?

We are offering to purchase up to 7,500,000 shares of our common stock, par value $0.001 per share (each, a “Share,” and collectively, “Shares”), at a price calculated as described herein that is a price not greater than $22.00 nor less than $19.25 per Share to the seller in cash, less any applicable withholding taxes and without interest, upon the terms and subject to the conditions of the Offer. See Section 1.

What is the purpose of the Offer?

We believe that the repurchase of Shares is consistent with our long-term goal of maximizing stockholder value.

We believe that the Offer set forth in this Offer to Purchase represents an efficient mechanism to provide our stockholders with the opportunity to tender all or a portion of their Shares and thereby receive a return of some or all of their investment in the Shares if they so elect. The Offer may also provide our stockholders with an efficient way to sell their Shares without incurring brokerage fees or commissions associated with open market sales. In addition, if we complete the Offer, stockholders who do not participate in the Offer, or who retain an equity interest as a result of a partial or conditional tender of Shares or proration, will have increased their relative percentage ownership interest in the Company at no cost to them. See Section 2.

In determining to proceed with the Offer, our management and Board of Directors evaluated the Company’s operations, financial condition, capital needs, strategy and expectations for the future and believe that the Offer is a prudent use of our financial resources. We believe that we will have adequate cash generating capacity, and we expect that our current cash balances and anticipated cash flows from operations will exceed our capital requirements for normal operations, capital expenditures and any potential acquisitions and other opportunities for growth that may arise for the foreseeable future. See Section 2 for additional information about the purpose of the Offer.

How many Shares will we purchase in the Offer?

Upon the terms and subject to the conditions of the Offer, we will purchase up to 7,500,000 Shares in the Offer or a lower amount depending on the number of Shares properly tendered and not properly withdrawn pursuant to the Offer. We will select the lowest single purchase price, not greater than $22.00 nor less than $19.25 per Share, that will allow us to purchase (i) 7,500,000 Shares, if 7,500,000 or more Shares are properly tendered and not properly withdrawn, or (ii) all Shares properly tendered and not properly withdrawn in the event that less than 7,500,000 Shares are properly tendered and not properly withdrawn.

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We expressly reserve the right to purchase additional Shares in the Offer, subject to applicable law. The Offer is conditioned on at least 3,000,000 Shares being tendered and is subject to certain other conditions. See Section 7. In accordance with the rules of the Securities and Exchange Commission (the “SEC”), if more than 7,500,000 Shares are tendered in the Offer at or below the Final Purchase Price, we may increase the number of Shares accepted for payment in the Offer by no more than 2% of the outstanding Shares without extending the Offer. See Section 1.

What will be the purchase price for the Shares and what will be the form of payment?

We are conducting the Offer through a procedure commonly called a modified “Dutch auction.” This procedure allows you to select the price, within a price range specified by us, at which you are willing to tender your Shares. The price range for the Final Purchase Price is $19.25 to $22.00 per Share. The Final Purchase Price will be a single per Share price, equal to the lowest single purchase price, not greater than $22.00 nor less than $19.25 per Share, that would allow us to purchase (i) 7,500,000 Shares, if 7,500,000 or more Shares are properly tendered and not properly withdrawn, or (ii) all Shares properly tendered and not properly withdrawn in the event that less than 7,500,000 Shares are properly tendered and not properly withdrawn. We will purchase all Shares at the Final Purchase Price, less any applicable withholding taxes and without interest, even if you have selected a purchase price lower than the Final Purchase Price, but we will not purchase any Shares tendered at a price above the Final Purchase Price.

If you wish to maximize your chances of having your Shares purchased in the Offer, you should check the box in the subsection entitled “Shares Tendered At Price Determined Under The Offer” (in the section captioned “Price (In Dollars) Per Share At Which Shares Are Being Tendered”) in the Letter of Transmittal, which will indicate that you will accept the Final Purchase Price as determined by us in accordance with the terms of and subject to the conditions of the Offer. If you agree to accept the Final Purchase Price, your Shares will be deemed to have been tendered at $19.25 per Share, which is the low end of the price range in the Offer. You should understand that this election may have the effect of lowering the Final Purchase Price and could result in your Shares being purchased at $19.25 per Share, which is the low end of the price range in the Offer, less any applicable withholding taxes and without interest. The low end of the price range in the Offer could be below the last reported sale price of the Shares on Nasdaq on the Expiration Date.

If we purchase your Shares in the Offer, we will pay you the Final Purchase Price in cash, less any applicable withholding taxes and without interest, promptly after the Expiration Date. Under no circumstances will we pay interest on the Final Purchase Price, even if there is a delay in making payment. See the Introduction, Section 1 and Section 3.

Stockholders are urged to obtain current market quotations for the Shares before deciding whether and at what price or prices to tender their Shares. See Section 8.

How will we pay for the Shares?

Assuming that 7,500,000 Shares are tendered in the Offer, the aggregate purchase price will be between approximately $144.4 million and $165.0 million. We expect that our fees and expenses related to the Offer, excluding any excise taxes incurred in connection with the Offer, will be approximately $1.4 million.

We intend to pay for the Shares and fees and expenses applicable to the Offer with cash on hand or with proceeds from the sale of available-for-sale securities. In accordance with the rules of the SEC, if more than 7,500,000 Shares are tendered in the Offer at or below the Final Purchase Price, we may increase the number of Shares accepted for payment in the Offer by no more than 2% of the outstanding Shares without extending the Offer. See Section 1.

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How long do I have to tender my Shares?

You may tender your Shares until the Offer expires. The Offer will expire one minute after 11:59 P.M., New York City time, on March 31, 2023, unless we extend or terminate the Offer (such date and time, as they may be extended, the “Expiration Date”). When used together with a specific time, the term Expiration Date refers to the date on which the Offer expires. See Section 1. We may choose to extend the Offer at any time and for any reason, subject to applicable laws. We cannot assure you, however, that we will extend the Offer or, if we extend it, for how long. See Section 1 and Section 15.

Beneficial owners holding their Shares through a broker, dealer, commercial bank, trust company or other nominee should be aware that their broker, dealer, commercial bank, trust company or other nominee may establish its own earlier deadlines for you to instruct it to accept the Offer on your behalf. Accordingly, beneficial owners wishing to participate in the Offer should contact their broker, dealer, commercial bank, trust company or other nominee as soon as possible in order to determine the times by which such owner must take action in order to participate in the Offer. We urge you to contact the broker, dealer, commercial bank, trust company or other nominee that holds your Shares to find out its deadline. See Section 3.

Can the Offer be extended, amended or terminated, and if so, under what circumstances?

Yes. We can extend or amend the Offer in our sole discretion at any time, subject to applicable laws. We may, however, decide not to extend the Expiration Date for the Offer. If we extend the Expiration Date for the Offer, we cannot indicate, at this time, the length of any extension that we may provide. In any event, if we extend the Expiration Date for the Offer, we will delay the acceptance of any Shares that have been tendered. See Section 15. We can also amend or terminate the Offer under certain circumstances and subject to applicable law. See Section 7.

How will I be notified if you extend the Offer or amend the terms of the Offer?

If we extend the Offer, we will issue a press release not later than 9:00 a.m., New York City time, on the first business day after the previously scheduled Expiration Date. If we extend the Offer, you may withdraw your Shares until the Expiration Date, as extended. We will announce any amendment to the Offer by making a public announcement of the amendment. In the event that the terms of the Offer are amended, we will file an amendment to the Schedule TO describing the amendment to the Offer. See Section 15.

Are there any conditions to the Offer?

Yes. Our obligation to accept for payment and pay for your tendered Shares depends upon a number of conditions that must be satisfied in our reasonable judgment or waived on or prior to the Expiration Date, including, among others:

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If any of the conditions in Section 7 is not satisfied, we may:

If we waive any of the conditions described above, we may be required to extend the Expiration Date.

For a more detailed discussion of these and other conditions to the Offer, please see Section 7.

How do I tender my Shares?

If you want to tender all or part of your Shares, you must do one of the following by the Expiration Date:

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If you wish to tender your Shares, but (a) the certificates for your Shares are not immediately available or cannot be delivered to the Depositary by the Expiration Date, (b) you cannot comply with the procedure for book-entry transfer by the Expiration Date, or (c) your other required documents cannot be delivered to the Depositary by the Expiration Date, you can still tender your Shares if you comply with the guaranteed delivery procedures described in Section 3.

We are not making the Offer to, and will not accept any tendered Shares from, stockholders in any jurisdiction where it would be illegal to do so. However, we may, at our discretion and subject to applicable law, take any actions necessary for us to make the Offer to stockholders in any such jurisdiction.

You may contact the Information Agent, the Dealer Manager or your broker, dealer, commercial bank, trust company or other nominee for assistance. The contact information for the Information Agent and the Dealer Manager is set forth on the back cover of this Offer to Purchase. See Section 3 and the Instructions to the Letter of Transmittal.

Once I have tendered Shares in the Offer, may I withdraw my tendered Shares?

Except as otherwise provided in Section 4, tenders of Shares pursuant to the Offer are irrevocable. Shares tendered pursuant to the Offer may be withdrawn at any time before the Expiration Date. If, following the Expiration Date, we have not accepted for payment the Shares you have tendered to us by one minute after 11:59 P.M., New York City time, on April 28, 2023, the 40th business day from the commencement of the Offer, you may also withdraw your Shares at any time thereafter.

How do I withdraw Shares I previously tendered?

If you are a registered holder of Shares, to properly withdraw your Shares, you must deliver on a timely basis a written notice of your withdrawal to the Depositary at one of the addresses appearing on the back cover of this Offer to Purchase. Your notice of withdrawal must specify your name, the number of Shares to be withdrawn and the name of the registered holder of the Shares. Some additional requirements apply if the certificates for Shares to be withdrawn have been delivered to the Depositary or if your Shares have been tendered under the procedure for book-entry transfer set forth in Section 3. If you hold Shares through a broker, dealer, commercial bank, trust company or similar institution, you should consult that institution on the procedures you must comply with and the time by which such procedures must be completed in order for that institution to provide a written notice of withdrawal. See Section 4.

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In what order will you purchase the tendered Shares?

If the terms and conditions of the Offer have been satisfied or waived and 7,500,000 Shares or less are properly tendered and not properly withdrawn prior to the Expiration Date, we will buy all Shares properly tendered at prices at or below the Final Purchase Price and not properly withdrawn.

If the conditions to the Offer have been satisfied or waived and more than 7,500,000 Shares have been properly tendered and not properly withdrawn prior to the Expiration Date, we will purchase Shares on the following basis:

Therefore, because of “Odd Lot” priority, proration and conditional tender provisions described above, we may not purchase all of the Shares that you tender even if you tender them at or below the Final Purchase Price. See Section 1 and Section 6.

If I own fewer than 100 Shares and I tender all of my Shares, will I be subject to proration?

If you (i) own, beneficially or of record, fewer than 100 Shares in the aggregate; (ii) properly tender all of these Shares at or below the Final Purchase Price and do not properly withdraw them before the Expiration Date; and (iii) complete the section(s) entitled “Odd Lots” in the Letter of Transmittal and, if applicable, in the Notice of Guaranteed Delivery, we will purchase all of your Shares without subjecting them to the proration procedure. See Section 1.

Has the Company or its Board of Directors adopted a position on the Offer?

Our Board of Directors has authorized us to make the Offer. However, none of the Company, the members of our Board of Directors, the Dealer Manager, the Depositary or the Information Agent makes any recommendation to you as to whether you should tender or refrain from tendering your Shares or as to the purchase price or purchase prices at which you may choose to tender your Shares. We cannot predict how our shares will trade after the Expiration Date, and it is possible that our share price will trade above the Final Purchase Price after the Expiration Date. You must make your own decision as to whether to tender your Shares and, if so, how many Shares to tender and the purchase price or purchase prices at which you will tender them. We recommend that you read carefully the information in this Offer to Purchase, the Letter of Transmittal and the other related materials that constitute part of the Offer, including our reasons for making the Offer, before taking any action with respect to the Offer. See Section 2. In addition, you should discuss whether to tender your Shares with your broker or other financial or tax advisors.

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If I decide not to tender, how will the Offer affect my Shares?

Stockholders who decide not to tender will own a greater percentage interest in the outstanding Shares following the consummation of the Offer. See Section 2.

Following the Offer, will you continue as a public company?

Yes. The Shares will continue to be listed on Nasdaq and we will continue to be subject to the periodic reporting requirements of the Exchange Act. See Section 2.

When and how will you pay me for the Shares I tender?

We will pay the Final Purchase Price to the seller, in cash, less applicable withholding taxes and without interest, for the Shares we purchase promptly after the Expiration Date. We will announce the preliminary results of the Offer, including price and preliminary information about any expected proration, on the next business day following the Expiration Date. We do not expect, however, to announce the final results of any proration or the Final Purchase Price and to begin paying for tendered Shares until after the Expiration Date. We will pay for the Shares accepted for purchase by depositing the aggregate purchase price with the Depositary promptly after the Expiration Date. The Depositary will act as your agent and will transmit to you the payment for all of your Shares accepted for payment. See Section 1 and Section 5.

If I am a holder of vested stock options, how do I participate in the Offer?

If you are a holder of vested options, you may exercise your vested options and tender any Shares issued upon such exercise. You must exercise your options sufficiently in advance of the Expiration Date to receive your Shares in order to tender. An exercise of an option cannot be revoked, even if Shares received upon the exercise thereof are tendered in the Offer but are not purchased in the Offer for any reason. See Section 3.

What is the last reported sale price of my Shares?

The Shares are listed and traded on Nasdaq under the symbol “CORT.” On March 3, 2023, one trading day before the commencement of the Offer, the last reported sale price of the Shares on Nasdaq was $19.20 per Share. You are urged to obtain current market quotations for the Shares before deciding whether and at what purchase price or purchase prices to tender your Shares. See Section 8.

Will I have to pay brokerage commissions if I tender my Shares?

If you are a registered stockholder and you tender your Shares directly to the Depositary, you will not incur any brokerage commissions. If you hold Shares through a broker, dealer, commercial bank, trust company or other nominee, we urge you to consult your broker, dealer, commercial bank, trust company or other nominee to determine whether any transaction costs are applicable. See the Introduction and Section 3.

Will I have to pay share transfer tax if I tender my Shares?

If you instruct the Depositary in the Letter of Transmittal to make the payment for tendered Shares to the registered holder of such Shares, you will not incur any share transfer tax. If you give special instructions to the Depositary in connection with your tender of Shares, or if tendered certificates for Shares are registered in the name of someone other than the person signing the Letter of Transmittal, then share transfer taxes may apply. See Section 5.

What are the U.S. federal income tax consequences if I tender my Shares?

Generally, if you are a U.S. Holder (as defined in Section 14), your receipt of cash from us in exchange for the Shares you tender will be a taxable transaction for U.S. federal income tax purposes. The cash you receive for

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your tendered Shares will generally be treated for U.S. federal income tax purposes either as consideration received in respect of a sale or exchange of the Shares purchased by us or as a distribution from us in respect of Shares. See Section 14 for a more detailed discussion of the tax treatment of the Offer. We urge you to consult your own tax advisor as to the particular tax consequences to you of the Offer.

If you are a Non-U.S. Holder (as defined in Section 14), because it is unclear whether the cash you receive in connection with the Offer will be treated (i) as proceeds of a sale or exchange or (ii) as a distribution, the Company intends to treat such payment as a dividend distribution for withholding purposes. Accordingly, if you are a Non-U.S. Holder, you will be subject to withholding on payments to you at a rate of 30% of the gross proceeds paid, unless you establish an entitlement to a reduced or zero rate of withholding by timely completing, under penalties of perjury, the applicable IRS Form W-8. See Section 14 for a more detailed discussion of the tax treatment of the Offer. Non-U.S. Holders are urged to consult their tax advisors regarding the application of U.S. federal income tax withholding and backup withholding, including eligibility for a withholding tax reduction or exemption and the refund procedure.

Whom should I contact with questions about the Offer?

The Information Agent or the Dealer Manager can help answer your questions. The Information Agent is D.F. King & Co., Inc. and the Dealer Manager is Piper Sandler & Co. Their contact information is set forth below.

The Information Agent for the Offer is:

D.F. King

D.F. King & Co., Inc.

48 Wall Street, 22nd Floor

New York, New York 10005

Stockholders, Banks and Brokers

Call: 1 (212) 269-5550

Call Toll-Free: 1 (800) 821-8781

Email: cort@dfking.com

The Dealer Manager for the Offer is:

Piper Sandler & Co.

Piper Sandler & Co.

800 Nicollet Mall

Minneapolis, Minnesota 55402

Direct: Mark Cieciura

Email: Mark.cieciura@psc.com

(312) 267-5100

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FORWARD-LOOKING STATEMENTS

This Offer to Purchase and other documents we file with the SEC contain forward-looking statements that are based on current expectations, estimates, forecasts and projections and our management’s belief and assumptions about us, our future performance and our business. In addition, we, or others on our behalf, may make forward-looking statements in press releases or written statements, or in our communications and discussions with investors and analysts in the normal course of business through meetings, webcasts, phone calls and conference calls. Such words as “believe,” “anticipate,” “intend,” “plan,” “estimate,” “expect,” “may,” “will,” “should,” “would,” “could,” “seek” and similar expressions are forward-looking statements based on management’s current expectations. Examples of forward-looking statements in this Offer to Purchase include those regarding cash balances, cash flows from operations, issued and outstanding shares and capital expenditures following the Offer. These statements are not guarantees and involve certain risks, uncertainties and assumptions that are difficult to predict. We describe our respective risks, uncertainties and assumptions that could affect the outcome or results of operations in the “Risk Factors” section of our Annual Report on Form 10-K for the fiscal year ended December 31, 2022. We have based our forward-looking statements on our management’s beliefs and assumptions based on information available to our management at the time the statements are made. We caution you that actual outcomes and results may differ materially from what is expressed, implied or forecast by our forward-looking statements.

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INTRODUCTION

To the holders of our shares of common stock:

We invite our stockholders to tender up to 7,500,000 shares of our common stock, par value $0.001 per share (each, a “Share,” and collectively, “Shares”), for purchase by us at a price calculated as described herein that is a price not greater than $22.00 nor less than $19.25 per Share to the seller in cash, less any applicable withholding taxes and without interest, upon the terms and subject to the conditions described in this Offer to Purchase (together with any amendments or supplements thereto, the “Offer to Purchase”), in the related Letter of Transmittal (together with any amendments or supplements thereto, the “Letter of Transmittal”) and in other related materials as may be amended or supplemented from time to time (collectively, with the Offer to Purchase and Letter of Transmittal, the “Offer”).

Upon the terms and subject to the conditions of the Offer, we will determine a single per Share price that we will pay for Shares properly tendered and not properly withdrawn from the Offer, taking into account the total number of Shares properly tendered and the prices specified, or deemed specified, by tendering stockholders. This single per Share price (the “Final Purchase Price”) will be the lowest single purchase price, not greater than $22.00 nor less than $19.25 per Share, that would allow us to purchase (i) 7,500,000 Shares, if 7,500,000 or more Shares are properly tendered and not properly withdrawn, or (ii) all Shares properly tendered and not properly withdrawn in the event that less than 7,500,000 Shares are properly tendered and not properly withdrawn.

We may not purchase all of the Shares tendered at or below the Final Purchase Price because of proration, “Odd Lot” priority and conditional tender provisions described in this Offer to Purchase.

Upon the terms and subject to the conditions of the Offer, if 7,500,000 Shares or less are properly tendered and not properly withdrawn, we will purchase all Shares properly tendered at or below the Final Purchase Price and not properly withdrawn prior to the Expiration Date. Shares not purchased in the Offer, including Shares tendered at prices in excess of the Final Purchase Price and Shares not purchased because of proration or conditional tender, will be returned to the tendering stockholders promptly after the Expiration Date. See Section 1.

We expressly reserve the right, in our sole discretion, to change the per Share purchase price range and to increase or decrease the number of Shares sought in the Offer, subject to applicable law. See Section 1.

If you are a holder of vested options, you may exercise your vested options and tender any of the Shares issued upon exercise. You must exercise your options sufficiently in advance of the Expiration Date to receive your Shares in order to tender. An exercise of an option cannot be revoked, even if Shares received upon the exercise thereof are tendered in the Offer but are not purchased in the Offer for any reason.

THE OFFER IS CONDITIONED ON AT LEAST 3,000,000 SHARES BEING TENDERED. THE OFFER IS ALSO SUBJECT TO CERTAIN OTHER CONDITIONS. SEE SECTION 7.

OUR BOARD OF DIRECTORS HAS AUTHORIZED US TO MAKE THE OFFER. HOWEVER, NONE OF THE COMPANY, THE MEMBERS OF OUR BOARD OF DIRECTORS, PIPER SANDLER & CO. (THE “DEALER MANAGER”), D.F. KING & CO., INC., THE INFORMATION AGENT FOR THE OFFER (THE “INFORMATION AGENT”), OR CONTINENTAL STOCK TRANSFER & TRUST COMPANY, THE DEPOSITARY FOR THE OFFER (THE “DEPOSITARY”), MAKES ANY RECOMMENDATION TO YOU AS TO WHETHER YOU SHOULD TENDER OR REFRAIN FROM TENDERING YOUR SHARES OR AS TO THE PURCHASE PRICE OR PURCHASE PRICES AT WHICH YOU MAY CHOOSE TO TENDER YOUR SHARES. NEITHER WE NOR ANY MEMBER OF OUR BOARD OF DIRECTORS, THE DEALER MANAGER, THE INFORMATION AGENT OR THE

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DEPOSITARY HAS AUTHORIZED ANY PERSON TO MAKE ANY RECOMMENDATION WITH RESPECT TO THE OFFER. YOU MUST MAKE YOUR OWN DECISION AS TO WHETHER TO TENDER YOUR SHARES AND, IF SO, HOW MANY SHARES TO TENDER AND THE PURCHASE PRICE OR PURCHASE PRICES AT WHICH YOU WILL TENDER THEM. WE RECOMMEND THAT YOU CONSULT YOUR OWN FINANCIAL AND TAX ADVISORS, AND READ CAREFULLY AND EVALUATE THE INFORMATION IN THIS OFFER TO PURCHASE AND IN THE LETTER OF TRANSMITTAL, INCLUDING OUR REASONS FOR MAKING THE OFFER, BEFORE TAKING ANY ACTION WITH RESPECT TO THE OFFER. SEE SECTION 2.

We will pay reasonable out-of-pocket fees and expenses incurred in connection with the Offer by the Dealer Manager, the Information Agent and the Depositary. See Section 16.

As of February 21, 2023, we had 107,899,316 issued and outstanding Shares. The 7,500,000 Shares that we are offering to purchase hereunder represent approximately 7% of the total number of our issued and outstanding Shares as of February 21, 2023. If the Offer is fully subscribed, we would have approximately 100,399,316 Shares outstanding immediately following the purchase of Shares tendered in the Offer. The actual number of Shares outstanding immediately following completion of the Offer will depend on the number of Shares tendered and purchased in the Offer. As of February 21, 2023, an aggregate of 8,441,169 Shares remained available for future awards under our equity incentive plans, 25,283,018 Shares were subject to currently outstanding options and 675,515 Shares were subject to currently outstanding restricted stock units and restricted stock awards. See Section 12. The Shares are listed and traded on Nasdaq under the symbol “CORT.”

On March 3, 2023, one trading day prior to the commencement of the Offer, the last reported sale price of the Shares was $19.20 per Share. Stockholders are urged to obtain current market quotations for the Shares before deciding whether and at what purchase price or purchase prices to tender their Shares. See Section 8 and Section 11.

The addresses and phone numbers for our principal executive offices are: 149 Commonwealth Drive, Menlo Park, CA 94025 (telephone number: (650) 327-3270).

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THE OFFER

Upon the terms and subject to the conditions of the Offer, if 7,500,000 Shares or less are properly tendered at or below the Final Purchase Price and not properly withdrawn prior to the Expiration Date, we will purchase all Shares properly tendered and not properly withdrawn.

The term “Expiration Date” means one minute after 11:59 P.M., New York City time, on March 31, 2023, unless and until we, in our sole discretion, shall have extended the period of time during which the Offer will remain open, in which event the term “Expiration Date” shall refer to the latest time and date at which the Offer, as so extended by us, shall expire or unless we terminate the Offer. When used together with a specific time, the term Expiration Date refers to the date on which the Offer expires. See Section 15 for a description of our right to extend, delay, terminate or amend the Offer.

In accordance with Instruction 5 of the Letter of Transmittal, stockholders desiring to tender Shares must either (i) specify that they are willing to sell their Shares to us at the Final Purchase Price (which could result in the tendering stockholder receiving a purchase price per Share as low as $19.25, the low end of the price range in the Offer, less any applicable withholding taxes and without interest) or (ii) specify the price or prices, not greater than $22.00 nor less than $19.25 per Share, at which they are willing to sell their Shares to us under the Offer. In the event that a stockholder specifies such a purchase price or purchase prices that exceeds the Final Purchase Price, the Company shall not purchase the Shares of such stockholder. Prices may be specified in multiples of $0.25. Promptly following the Expiration Date, we will determine the Final Purchase Price that we will pay for Shares properly tendered and not properly withdrawn, taking into account the number of Shares tendered and the prices specified, or deemed specified, by tendering stockholders. The Final Purchase Price will be a single per Share price, equal to the lowest single purchase price, not greater than $22.00 nor less than $19.25 per Share, that would allow us to purchase (i) 7,500,000 Shares, if 7,500,000 or more Shares are properly tendered and not properly withdrawn, or (ii) all Shares properly tendered and not properly withdrawn in the event that less than 7,500,000 Shares are properly tendered and not properly withdrawn.

We will pay the Final Purchase Price for all Shares purchased in the Offer, less any applicable withholding taxes and without interest, promptly after the Expiration Date. We will not purchase any Shares at a price in excess of the Final Purchase Price.

If you specify that you are willing to sell your Shares to us at the Final Purchase Price (which could result in you receiving a purchase price per Share as low as $19.25, the low end of the price range in the Offer, less any applicable withholding taxes and without interest), your Shares will be deemed to be tendered at $19.25 per Share, which is the low end of the price range in the Offer, for purposes of determining the Final Purchase Price. You should understand that this election may effectively lower the Final Purchase Price and could result in your Shares being purchased at $19.25 per Share, which is the low end of the price range in the Offer, less any applicable withholding taxes and without interest; and that the Final Purchase Price could be below the last reported sale price of the Shares on Nasdaq on the Expiration Date.

Throughout the Offer, certain information relating to the trading price of our Shares shall be available via the Information Agent at the address and telephone number set forth on the back cover page of this Offer to Purchase. We will announce the Final Purchase Price by press release as promptly as practicable after it has been determined. Such press release will also be filed as an amendment to our Issuer Tender Offer Statement on Schedule TO (the “Schedule TO”) that we have filed with the Securities and Exchange Commission (the “SEC”) relating to the Offer. We do not expect, however, to announce the final results of any proration or the Final Purchase Price and to begin paying for tendered Shares until after the Expiration Date.

We will only purchase Shares properly tendered at prices at or below the Final Purchase Price and not properly withdrawn. However, because of proration, “Odd Lot” priority and the conditional tender provisions described in

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this Offer to Purchase, we may not purchase all of the Shares tendered at or below the Final Purchase Price if more than 7,500,000 Shares are properly tendered and not properly withdrawn. We will return all Shares tendered and not purchased pursuant to the Offer, including Shares tendered at prices in excess of the Final Purchase Price and Shares not purchased because of proration or conditional tenders, to the tendering stockholders at our expense promptly following the Expiration Date.

By following the Instructions to the Letter of Transmittal, stockholders can specify different minimum purchase prices for specified portions of their Shares, but a separate Letter of Transmittal must be submitted for Shares tendered at each price. Stockholders can also specify the order in which the specified portions will be purchased in the event that, as a result of proration or otherwise, some but not all of the tendered Shares are purchased pursuant to the Offer. In the event a stockholder does not designate such order and fewer than all Shares are purchased due to proration, the Depositary will select the order of Shares purchased.

We expressly reserve the right, in our sole discretion, to change the per Share purchase price range and to increase or decrease the number of Shares sought in the Offer, subject to applicable law. In accordance with the rules of the SEC, if more than 7,500,000 Shares are tendered in the Offer at or below the Final Purchase Price, we may increase the number of Shares accepted for payment in the Offer by no more than 2% of the outstanding Shares without extending the Offer. However, if we purchase an additional number of Shares in excess of 2% of the outstanding Shares, we will amend and extend the Offer to the extent required by applicable law. See Section 15.

In the event of an over-subscription of the Offer as described below, Shares tendered at or below the Final Purchase Price prior to the Expiration Date will be subject to proration, except for Odd Lots as described below. The proration period and withdrawal rights also expire on the Expiration Date.

THE OFFER IS CONDITIONED ON AT LEAST 3,000,000 SHARES BEING TENDERED. THE OFFER IS ALSO SUBJECT TO CERTAIN OTHER CONDITIONS. SEE SECTION 7.

Priority of Purchases

If the terms and conditions of the Offer have been satisfied or waived and 7,500,000 Shares or less are properly tendered and not properly withdrawn prior to the Expiration Date, we will buy all Shares properly tendered at prices at or below the Final Purchase Price and not properly withdrawn.

If the conditions to the Offer have been satisfied or waived and more than 7,500,000 Shares have been properly tendered and not properly withdrawn prior to the Expiration Date, we will purchase properly tendered Shares on the basis set forth below:

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As a result of the foregoing priorities applicable to the purchase of Shares tendered, it is possible that fewer than all Shares tendered by a stockholder will be purchased or that, if a tender is conditioned upon the purchase of a specified number of Shares, none of those Shares will be purchased even though those Shares were tendered at prices at or below the Final Purchase Price.

As we noted above, we may elect to purchase more than 7,500,000 Shares in the Offer, subject to applicable law. If we do so, the preceding provisions will apply to the greater number of Shares.

Odd Lots

The term “Odd Lots” means all Shares tendered by any person (such person, an “Odd Lot Holder”) who owned, beneficially or of record, an aggregate of fewer than 100 Shares and certifies such fact in the appropriate place on the Letter of Transmittal and, if applicable, on the Notice of Guaranteed Delivery. This preference is not available to partial tenders or beneficial or record holders of 100 or more Shares, even if such holders have separate accounts or certificates representing fewer than 100 Shares. Odd Lots will be accepted for payment at the same time as other tendered Shares.

Proration

If proration of tendered Shares is required, we will determine the proration for each stockholder tendering Shares, if any, promptly following the Expiration Date. Proration for each stockholder tendering Shares (excluding Odd Lot Holders) will be based on the ratio of the number of Shares properly tendered and not properly withdrawn by such stockholder to the total number of Shares properly tendered and not properly withdrawn by all stockholders (excluding Odd Lot Holders) at or below the Final Purchase Price, subject to the provisions governing conditional tenders described in Section 6, any adjustment to avoid the purchase of fractional Shares and the terms and conditions of the Offer. Due to the difficulty in determining the number of Shares properly tendered and not properly withdrawn, the conditional tender procedure described in Section 6 and the guaranteed delivery procedure described in Section 3, we expect that we will not be able to announce the final proration for each stockholder or commence payment for any Shares purchased pursuant to the Offer until after the Expiration Date. The preliminary results of any proration will be announced by press release as promptly as practicable after the Expiration Date.

As described in Section 14, the number of Shares that we will purchase from a stockholder pursuant to the Offer may affect the U.S. federal income tax consequences to the stockholder of the purchase and, therefore, may be relevant to a stockholder’s decision whether to tender Shares. The Letter of Transmittal affords each stockholder who tenders Shares registered in such stockholder’s name directly to the Depositary the opportunity to designate the order of priority in which Shares tendered are to be purchased in the event of proration as well as the ability to condition such tender on a minimum number of Shares being purchased.

This Offer to Purchase and the Letter of Transmittal will be mailed to record holders of the Shares and will be furnished to brokers, dealers, commercial banks, trust companies and other nominees and similar persons whose names, or whose nominees’ names, appear on our stockholder list or, if applicable, who are listed as participants in a clearing agency’s security position listing for subsequent transmittal to beneficial owners of Shares.

Purpose of the Offer

We believe that the repurchase of Shares is consistent with our long-term goal of maximizing stockholder value.

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We believe that the Offer set forth in this Offer to Purchase represents an efficient mechanism to provide our stockholders with the opportunity to tender all or a portion of their Shares and thereby receive a return of some or all of their investment in the Shares if they so elect. The Offer may also provide our stockholders with an efficient way to sell their Shares without incurring brokerage fees or commissions associated with open market sales. In addition, if we complete the Offer, stockholders who do not participate in the Offer, or who retain an equity interest as a result of a partial or conditional tender of Shares or proration, will have increased their relative percentage ownership interest in the Company at no cost to them.

In determining to proceed with the Offer, our management and Board of Directors evaluated the Company’s operations, financial condition, capital needs, strategy and expectations for the future and believe that the Offer is a prudent use of our financial resources. We believe that we will have adequate cash generating capacity, and we expect that our current cash balances and anticipated cash flows from operations will exceed our capital requirements for normal operations, capital expenditures and any potential acquisitions and other opportunities for growth that may arise. In considering the Offer, our management and our Board of Directors took into account the expected financial impact of the Offer.

In addition to those factors described above, our Board of Directors determined to conduct a “modified Dutch auction” tender offer at a price range of $19.25 to $22.00 per Share for the Shares after considering, among other things, recent stock trading ranges and volumes for the Shares and liquidity opportunities available to our stockholders.

Certain Effects of the Offer

As of February 21, 2023, we had 107,899,316 issued and outstanding Shares. The 7,500,000 Shares that we are offering to purchase hereunder represent approximately 7% of the total number of our issued and outstanding Shares as of February 21, 2023. If the Offer is fully subscribed, we would have approximately 100,399,316 Shares outstanding immediately following the purchase of Shares tendered in the Offer. The actual number of Shares outstanding immediately following completion of the Offer will depend on the number of Shares tendered and purchased in the Offer.

If we complete the Offer, stockholders who do not participate in the Offer will automatically increase their relative percentage ownership interest in us. These stockholders will also continue to bear the risks associated with owning the Shares. Stockholders may be able to sell non-tendered Shares in the future on Nasdaq or otherwise at a net price significantly higher or lower than the Final Purchase Price. We can give no assurance as to the price at which a stockholder may be able to sell his or her Shares in the future.

There will be a sufficient number of Shares outstanding and publicly traded following completion of the Offer to ensure a continued trading market for the Shares. Based upon published guidelines of Nasdaq and the conditions of the Offer, our purchase of Shares under the Offer will not cause our remaining outstanding Shares to be delisted from Nasdaq. The Shares are registered under the Exchange Act, which requires, among other things, that we furnish certain information to our stockholders and comply with proxy rules in connection with meetings of our stockholders. Our purchase of Shares under the Offer will not result in the Shares becoming eligible for deregistration under the Exchange Act.

OUR BOARD OF DIRECTORS HAS AUTHORIZED US TO MAKE THE OFFER. HOWEVER, NONE OF THE COMPANY, THE MEMBERS OF OUR BOARD OF DIRECTORS, THE DEALER MANAGER, THE INFORMATION AGENT OR THE DEPOSITARY MAKES ANY RECOMMENDATION TO YOU AS TO WHETHER YOU SHOULD TENDER OR REFRAIN FROM TENDERING YOUR SHARES OR AS TO THE PURCHASE PRICE OR PURCHASE PRICES AT WHICH YOU MAY CHOOSE TO TENDER YOUR SHARES. NEITHER WE NOR ANY MEMBER OF OUR BOARD OF DIRECTORS, THE DEALER MANAGER, THE INFORMATION AGENT OR THE DEPOSITARY HAS AUTHORIZED ANY PERSON TO MAKE ANY RECOMMENDATION TO YOU AS TO WHETHER YOU SHOULD TENDER OR

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REFRAIN FROM TENDERING YOUR SHARES OR AS TO THE PURCHASE PRICE OR PURCHASE PRICES AT WHICH YOU MAY CHOOSE TO TENDER YOUR SHARES. YOU MUST MAKE YOUR OWN DECISION AS TO WHETHER TO TENDER YOUR SHARES AND, IF SO, HOW MANY SHARES TO TENDER AND THE PURCHASE PRICE OR PURCHASE PRICES AT WHICH YOU WILL TENDER THEM. IN DOING SO, YOU SHOULD CONSULT YOUR OWN FINANCIAL AND TAX ADVISORS, AND READ CAREFULLY AND EVALUATE THE INFORMATION IN THIS OFFER TO PURCHASE AND IN THE LETTER OF TRANSMITTAL, INCLUDING OUR REASONS FOR MAKING THE OFFER.

We intend to hold the Shares we acquire pursuant to the Offer in treasury.

Plans and Proposals

Except as disclosed or incorporated by reference in this Offer to Purchase, we have no current definitive plans, proposals or negotiations that relate to or would result in:

While we have no definitive plans or proposals regarding any of the foregoing as of the date of this Offer to Purchase, our management considers from time to time, and may undertake or plan actions that relate to or could result in, one or more of the matters listed above. We reserve the right to change our plans and intentions at any time after the date of this Offer to Purchase, subject to our obligation to update this Offer to Purchase to reflect material changes in the information contained herein. Stockholders tendering Shares in the Offer may run the risk of foregoing the benefit of any appreciation in the market price of the Shares resulting from such potential future events.

Proper Tender of Shares

For Shares to be properly tendered pursuant to the Offer, the certificates for such Shares (or confirmation of receipt of such Shares pursuant to the procedure for book-entry transfer set forth below), together with a properly completed and duly executed Letter of Transmittal, including any required signature guarantees, or an “Agent’s

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Message” (as defined below), and any other documents required by the Letter of Transmittal, must be received before the Expiration Date by the Depositary at one of its addresses set forth on the back cover of this Offer to Purchase. Beneficial owners should be aware that their broker, dealer, commercial bank, trust company or other nominee may establish its own earlier deadlines for participation in the Offer on their behalf. Accordingly, beneficial owners wishing to participate in the Offer should contact their broker, dealer, commercial bank, trust company or other nominee as soon as possible in order to determine the times by which such owner must take action in order to participate in the Offer.

In the alternative, the tendering stockholder must, before the Expiration Date, comply with the guaranteed delivery procedures described below.

In accordance with Instruction 5 of the Letter of Transmittal, each stockholder desiring to tender Shares in the Offer must complete the section captioned “Price (In Dollars) Per Share At Which Shares Are Being Tendered” by either (i) checking the box in the subsection entitled “Shares Tendered At Price Determined Under The Offer,” which will indicate that you will accept the Final Purchase Price as determined by us in accordance with the terms of and subject to the conditions of the Offer, or (ii) checking one of the boxes in the subsection entitled “Shares Tendered At Price Determined By Stockholder,” indicating the price at which Shares are being tendered.

Stockholders who desire to tender Shares at more than one price must complete a separate Letter of Transmittal for each price at which Shares are tendered, provided that the same Shares cannot be tendered (unless such Shares were properly withdrawn in accordance with Section 4) at more than one price. To tender Shares properly, one and only one box must be checked in the section captioned “Price (In Dollars) Per Share At Which Shares Are Being Tendered” in the Letter of Transmittal.

If you wish to maximize your chances of having your Shares purchased in the Offer, you should check the box in the subsection entitled “Shares Tendered At Price Determined Under The Offer” (in the section captioned “Price (In Dollars) Per Share At Which Shares Are Being Tendered”) in the Letter of Transmittal, which will indicate that you will accept the Final Purchase Price as determined by us in accordance with the terms of and subject to the conditions of the Offer. If you agree to accept the Final Purchase Price, your Shares will be deemed to have been tendered at $19.25 per Share, which is the low end of the price range in the Offer. You should understand that this election may have the effect of lowering the Final Purchase Price and could result in the tendered Shares being purchased at $19.25 per Share, which is the low end of the price range in the Offer, less any applicable withholding taxes and without interest. If tendering stockholders wish to indicate a specific price (in multiples of $0.25) at which their Shares are being tendered, they must check the appropriate box in the subsection entitled “Shares Tendered At Price Determined By Stockholder” in the section captioned “Price (In Dollars) Per Share At Which Shares Are Being Tendered” in the Letter of Transmittal. Tendering stockholders should be aware that this election could mean that none of their Shares will be purchased if they check a box other than the box representing the price at or below the Final Purchase Price.

Stockholders holding their Shares through a broker, dealer, commercial bank, trust company or other nominee must contact the nominee in order to tender their Shares. Stockholders who hold Shares through nominees are urged to consult their nominees to determine whether transaction costs may apply if stockholders tender Shares through the nominees and not directly to the Depositary.

Stockholders may tender Shares subject to the condition that all, or a specified minimum number of Shares, be purchased. Any stockholder desiring to make such a conditional tender should so indicate in the box entitled “Conditional Tender” in the Letter of Transmittal. It is the tendering stockholder’s responsibility to determine the minimum number of Shares to be purchased. Stockholders should consult their own financial and tax advisors with respect to the effect of proration of the Offer and the advisability of making a conditional tender. See Section 6 and Section 14.

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Signature Guarantees and Method of Delivery

No signature guarantee is required if:

If a certificate for Shares is registered in the name of a person other than the person executing the Letter of Transmittal, or if payment is to be made, or new certificates for Shares not purchased or tendered are to be issued, to a person other than the registered holder, then the certificate must be endorsed or accompanied by an appropriate stock power, signed in either case exactly as the name of the registered holder appears on the certificate, with the signature guaranteed by an Eligible Institution.

Payment for Shares tendered and accepted for payment pursuant to the Offer will be made only after timely receipt by the Depositary of:

Odd Lot Holders who tender all of their Shares must also complete the section captioned “Odd Lots” in the Letter of Transmittal and, if applicable, in the Notice of Guaranteed Delivery to qualify for the priority treatment available to Odd Lot Holders as set forth in Section 1.

The method of delivery of all documents, including certificates for Shares, the Letter of Transmittal and any other required documents, is at the sole election and risk of the tendering stockholder. If delivery is by mail, then registered mail with return receipt requested, properly insured, is recommended. Shares will be deemed delivered only when actually received by the Depositary (including, in the case of a book-entry transfer, by book-entry confirmation). In all cases, sufficient time should be allowed to ensure timely delivery.

All deliveries in connection with the Offer, including a Letter of Transmittal and certificates for Shares, must be made to the Depositary and not to us, the Dealer Manager, the Information Agent or the Book-Entry Transfer Facility. ANY DOCUMENTS DELIVERED TO US, THE DEALER MANAGER, THE INFORMATION AGENT OR THE BOOK-ENTRY TRANSFER FACILITY WILL NOT BE FORWARDED TO THE DEPOSITARY AND WILL NOT BE DEEMED TO BE PROPERLY TENDERED.

Book-Entry Delivery

The Depositary will establish an account with respect to the Shares for purposes of the Offer at the Book-Entry Transfer Facility within two business days after the date of this Offer to Purchase, and any financial institution that is a participant in the Book-Entry Transfer Facility’s system may make book-entry delivery of the Shares by

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means of a book-entry transfer by causing the Book-Entry Transfer Facility to transfer Shares into the Depositary’s account in accordance with the Book-Entry Transfer Facility’s procedures for transfer. Although delivery of Shares may be effected through a book-entry transfer into the Depositary’s account at the Book-Entry Transfer Facility, a properly completed and duly executed Letter of Transmittal, including any required signature guarantees, or an Agent’s Message, and any other required documents must, in any case, be transmitted to and received by the Depositary at one of its addresses set forth on the back cover of this Offer to Purchase before the Expiration Date, or the tendering stockholder must comply with the guaranteed delivery procedures described below. Delivery of the Letter of Transmittal and any other required documents to the Book-Entry Transfer Facility does not constitute delivery to the Depositary.

The term “Agent’s Message” means a message transmitted by the Book-Entry Transfer Facility to, and received by, the Depositary, which states that the Book-Entry Transfer Facility has received an express acknowledgment from the participant in the Book-Entry Transfer Facility tendering the Shares that such participant has received and agrees to be bound by the terms of the Letter of Transmittal and that we may enforce such agreement against the participant.

Guaranteed Delivery

If you wish to tender Shares in the Offer and your certificates for Shares are not immediately available or the procedures for book-entry transfer cannot be completed on a timely basis or time will not permit all required documents to reach the Depositary prior to the Expiration Date, your tender may be effected if all the following conditions are met:

A Notice of Guaranteed Delivery must be delivered to the Depositary by overnight courier, email transmission (at Reorg+CorceptTender2023@continentalstock.com) or mail before the Expiration Date and must include a guarantee by an Eligible Institution in the form set forth in the Notice of Guaranteed Delivery.

The Notice of Guaranteed Delivery form is filed as an exhibit to the Schedule TO. Copies of the form may also be obtained from the Information Agent, who may be contacted at any of its telephone numbers listed on the back cover of this Offer to Purchase.

If you hold Shares through a broker, dealer, commercial bank, trust company or similar institution, that institution must tender your Shares on your behalf. The Book-Entry Transfer Facility is expected to remain open until 5:00 p.m., New York City time, on the Expiration Date, and institutions may be able to process tenders for our Shares through the Book-Entry Transfer Facility during that time (although there is no assurance that this will be the case). Once the Book-Entry Transfer Facility has closed, participants in the Book-Entry Transfer Facility whose name appears on the Book-Entry Transfer Facility security position listing as the owner of Shares will still be able to tender their Shares by delivering a Notice of Guaranteed Delivery to the Depositary via email (at Reorg+CorceptTender2023@continentalstock.com). If you hold Shares through a broker, dealer, commercial

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bank, trust company or similar institution, that institution must submit any Notice of Guaranteed Delivery on your behalf. It will generally not be possible to direct such an institution to submit a Notice of Guaranteed Delivery once that institution has closed for the day. You should consult with such institution on the procedures that must be complied with and the time by which such procedures must be completed to ensure that the institution has ample time to submit a Notice of Guaranteed Delivery on your behalf prior to the Expiration Date. In addition, any such institution, if it is not an eligible institution, will need to obtain a Medallion guarantee from an eligible institution in the form set forth in the applicable Notice of Guaranteed Delivery in connection with the delivery of those Shares.

As described above under “Guaranteed Delivery,” once the Notice of Guaranteed Delivery is delivered, which must occur prior to the Expiration Date, you or your institution will have two Nasdaq trading days following such delivery to meet the conditions described above in order to effect the tender of your Shares. Therefore, the earliest your tender could be effected is at 8:00 a.m., New York City time, on the next Nasdaq trading day when the Book-Entry Transfer Facility reopens, assuming all such conditions have been met. The form of Notice of Guaranteed Delivery can be obtained from the website described above.

Procedures for Stock Options

We are not offering, as part of the Offer, to purchase any outstanding stock options, and tenders of stock options will not be accepted. Holders of vested stock options may exercise options and tender the Shares received upon exercise in the Offer. Options must be exercised sufficiently in advance of the Expiration Date in order to have time for the exercise to settle before the Shares received upon exercise of the options may be tendered. An exercise of an option cannot be revoked, even if Shares received upon the exercise thereof are tendered in the Offer but are not purchased in the Offer for any reason.

If you are a holder of vested but unexercised options, you should evaluate this Offer to Purchase carefully to determine if participation would be advantageous to you, based on the exercise prices of your stock options, the dates of your stock option grants, the remaining term in which you may exercise your options and the provisions for prorated purchases described in Section 1.

Return of Unpurchased Shares

If any properly tendered Shares are not purchased under the Offer or are properly withdrawn before the Expiration Date upon the terms and subject to the conditions of the Offer, or if less than all Shares evidenced by a stockholder’s certificate(s) are tendered, we will credit the certificates to book-entry for unpurchased Shares promptly after the expiration or termination of the Offer or, in the case of Shares tendered by book-entry transfer at the Book-Entry Transfer Facility, the Shares will be credited to the appropriate account maintained by the tendering stockholder at the Book-Entry Transfer Facility, in each case without expense to the stockholder.

Determination of Validity; Rejection of Shares; Waiver of Defects; No Obligation to Give Notice of Defects

All questions as to the number of Shares to be accepted, the Final Purchase Price to be paid for Shares to be accepted and the validity, form, eligibility (including time of receipt) and acceptance for payment of any tender of Shares will be determined by us, in our sole discretion, and our determination will be final and binding on all parties absent a finding to the contrary by a court of competent jurisdiction. We reserve the absolute right to reject any or all tenders of any Shares that we determine are not in proper form or the acceptance for payment of or payment for which may, in the opinion of our counsel, be unlawful. We also reserve the absolute right to waive any of the conditions of the Offer on or prior to the Expiration Date, or any defect or irregularity in any tender with respect to any particular Shares or any particular stockholder (whether or not we waive similar defects or irregularities in the case of other stockholders), and our interpretation of the terms of the Offer will be final and binding on all parties absent a finding to the contrary by a court of competent jurisdiction. In the event a condition is waived with respect to any particular stockholder, the same condition will be waived with respect to

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all stockholders. No tender of Shares will be deemed to have been properly made until all defects or irregularities have been cured by the tendering stockholder or waived by us. We will not be liable for failure to waive any condition of the Offer, or any defect or irregularity in any tender of Shares. None of the Company, the Dealer Manager, the Depositary, the Information Agent or any other person will be obligated to give notice of any defects or irregularities in tenders, nor will any of the foregoing incur any liability for failure to give any such notification.

Tendering Stockholder’s Representation and Warranty; Our Acceptance Constitutes an Agreement

It is a violation of Exchange Act Rule 14e-4 for a person acting alone or in concert with others, directly or indirectly, to tender Shares for that person’s own account unless, at the time of tender and at the end of the proration period or period during which Shares are accepted by lot (including any extensions of such period), the person so tendering (i) has a “net long position” equal to or greater than the amount of Shares tendered in (a) Shares or (b) other securities convertible into or exchangeable or exercisable for Shares and, upon acceptance of the tender, will acquire the Shares by conversion, exchange or exercise and (ii) will deliver or cause to be delivered the Shares in accordance with the terms of the Offer. Rule 14e-4 also provides a similar restriction applicable to a tender on behalf of another person.

A tender of Shares in accordance with any of the procedures described above will constitute the tendering stockholder’s acceptance of the terms and conditions of the Offer, as well as the tendering stockholder’s representation and warranty to us that (i) the stockholder has a “net long position,” within the meaning of Rule 14e-4 promulgated under the Exchange Act, in the Shares or equivalent securities at least equal to the Shares being tendered, and (ii) the tender of Shares complies with Rule 14e-4. Our acceptance for payment of Shares tendered pursuant to the Offer will constitute a binding agreement between the tendering stockholder and us on the terms and subject to the conditions of the Offer, which agreement will be governed by, and construed in accordance with, the laws of the State of Delaware.

A tender of Shares made pursuant to any method of delivery set forth herein will also constitute a representation and warranty to us that the tendering stockholder has full power and authority to tender, sell, assign and transfer the Shares tendered, and that, when the same are accepted for purchase by us, we will acquire good, marketable and unencumbered title thereto, free and clear of all security interests, liens, restrictions, claims, encumbrances and other obligations relating to the sale or transfer of the Shares, and the same will not be subject to any adverse claim or right.

Any such tendering stockholder will, on request by the Depositary or us, execute and deliver any additional documents deemed by the Depositary or us to be necessary or desirable to complete the sale, assignment and transfer of the Shares tendered, all in accordance with the terms of the Offer.

All authority conferred or agreed to be conferred by delivery of the Letter of Transmittal shall be binding on the successors, assigns, heirs, personal representatives, executors, administrators and other legal representatives of the tendering stockholder and shall not be affected by, and shall survive, the death or incapacity of such tendering stockholder.

Lost or Destroyed Certificates

Stockholders whose certificates for part or all of their Shares have been lost, destroyed or stolen may contact Continental Stock Transfer & Trust Company as transfer agent at the number (917) 262-2378 or at the address set forth on the back cover of this Offer to Purchase for instructions to obtain a replacement certificate. Those certificates will then be required to be submitted together with the Letter of Transmittal in order to receive payment for Shares that are tendered and accepted for payment. A bond may be required to be posted by the stockholder to secure against the risk that the certificates may be subsequently recirculated. The Letter of Transmittal and related documents cannot be processed until the procedures for replacing lost or destroyed certificates have been followed. Stockholders are requested to contact Continental Stock Transfer & Trust

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Company immediately in order to permit timely processing of this documentation. Certificates for Shares, together with a properly completed Letter of Transmittal and any other documents required by the Letter of Transmittal, must be delivered to the Depositary and not to us, the Dealer Manager, or the Information Agent. Any certificates delivered to us, the Dealer Manager, or the Information Agent will not be forwarded to the Depositary and will not be deemed to be properly tendered.

Except as otherwise provided in this Section 4, tenders of Shares pursuant to the Offer are irrevocable. Shares tendered pursuant to the Offer may be withdrawn at any time before the Expiration Date. If, following the Expiration Date, we have not accepted for payment the Shares you have tendered to us by one minute after 11:59 P.M., New York City time, on April 28, 2023, the 40th business day from the commencement of the Offer, you may also withdraw your Shares at any time thereafter.

If you are a registered holder of Shares, for a withdrawal to be effective, a notice of withdrawal, in written form, must be received in a timely manner by the Depositary at one of its addresses set forth on the back cover of this Offer to Purchase. Any notice of withdrawal must specify the name of the tendering stockholder, the number of Shares to be withdrawn and the name of the registered holder of the Shares. If certificates for Shares to be withdrawn have been delivered or otherwise identified to the Depositary, then, before the release of the certificates, the tendering stockholder must also submit the serial numbers shown on the particular certificates for Shares to be withdrawn and the signature(s) on the written notice of withdrawal must be guaranteed by an Eligible Institution (except in the case of Shares tendered for the account of an Eligible Institution). If Shares have been tendered pursuant to the procedures for book-entry transfer described in Section 3, the notice of withdrawal also must specify the name and the number of the account at the Book-Entry Transfer Facility to be credited with the withdrawn Shares and must otherwise comply with the Book-Entry Transfer Facility’s procedures. If a stockholder has used more than one Letter of Transmittal or has otherwise tendered Shares in more than one group of Shares, the stockholder may withdraw Shares using either separate written notices of withdrawal or a combined written notice of withdrawal, so long as the information specified above is included.

If you hold Shares through a broker, dealer, commercial bank, trust company or similar institution, you should consult that institution on the procedures you must comply with and the time by which such procedures must be completed in order for that institution to provide a written notice of withdrawal.

We will determine all questions as to the form and validity, including the time of receipt, of any notice of withdrawal, in our sole discretion, which determination will be final and binding on all parties absent a finding to the contrary by a court of competent jurisdiction. Neither we nor the Dealer Manager, the Depositary, the Information Agent or any other person will be obligated to give notice of any defects or irregularities in any notice of withdrawal, nor will any of the foregoing incur liability for failure to give any such notification. Withdrawals may not be rescinded, and any Shares properly withdrawn will be deemed not properly tendered for purposes of the Offer. However, withdrawn Shares may be re-tendered before the Expiration Date by again following one of the procedures described in Section 3.

If we extend the Offer, are delayed in our purchase of Shares or are unable to purchase Shares pursuant to the Offer for any reason, then, without prejudice to our rights under the Offer, the Depositary may, subject to applicable law, retain tendered Shares on our behalf, and the Shares may not be withdrawn except to the extent tendering stockholders are entitled to withdrawal rights as described in this Section 4. Our reservation of the right to delay payment for Shares that we have accepted for payment is limited by Exchange Act Rule 13e-4(f)(5), which requires that we must pay the consideration offered or return the Shares tendered promptly after termination or withdrawal of the Offer.

If you hold Shares through a broker, dealer, commercial bank, trust company or similar institution, any notice of withdrawal must be delivered by that institution on your behalf. The Book-Entry Transfer Facility is expected to remain open until 5:00 p.m., New York City time, on the Expiration Date and institutions may be able to process

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withdrawals of Shares through the Book-Entry Transfer Facility during that time (although there can be no assurance that this will be the case). Once the Book-Entry Transfer Facility has closed, if you beneficially own Shares that were previously delivered through the Book-Entry Transfer Facility, then in order to properly withdraw your Shares the institution through which your Shares are held must deliver via email a written notice of withdrawal to the Depositary at Reorg+CorceptTender2023@continentalstock.com prior to the Expiration Date. It will generally not be possible to direct such an institution to submit a written notice of withdrawal once that institution has closed for the day. You should consult with such institution on the procedures that must be complied with and the time by which such procedures must be completed to ensure that the institution has ample time to submit a written notice of withdrawal on your behalf prior to the Expiration Date. Such notice of withdrawal must be in the form of the Book-Entry Transfer Facility’s notice of withdrawal, must specify the name and number of the account at the Book-Entry Transfer Facility to be credited with the withdrawn Shares and must otherwise comply with the Book-Entry Transfer Facility’s procedures. Shares can be properly withdrawn only if the Depositary receives a written notice of withdrawal directly from the relevant institution that tendered the Shares through the Book-Entry Transfer Facility.

Upon the terms and subject to the conditions of the Offer, promptly following the Expiration Date, we will:

For purposes of the Offer, we will be deemed to have accepted for payment (and therefore be deemed to have purchased), subject to proration, “Odd Lot” priority and conditional tender provisions of the Offer, Shares that are properly tendered at or below the Final Purchase Price and not properly withdrawn only when, as and if we give oral or written notice to the Depositary of our acceptance of the Shares for payment pursuant to the Offer.

Upon the terms and subject to the conditions of the Offer, promptly after the Expiration Date, we will accept for payment and pay the Final Purchase Price per Share for all of the Shares accepted for payment in accordance with the Offer. In all cases, payment for Shares properly tendered and accepted for payment in accordance with the Offer will be made promptly, subject to possible delay due to proration, but only after timely receipt by the Depositary of:

We will pay for Shares purchased pursuant to the Offer by depositing the aggregate purchase price for the Shares with the Depositary, which will act as agent for tendering stockholders for the purpose of receiving payment from us and transmitting payment to the tendering stockholders. In the event of proration, the Depositary will determine the proration for each stockholder tendering Shares and pay for those tendered Shares accepted for payment promptly after the Expiration Date. Certificates for all Shares tendered and not purchased, including all Shares tendered at prices in excess of the Final Purchase Price and Shares not purchased due to proration or conditional tenders, will be credited to book-entry with the Depositary, and, in the case of Shares tendered by book-entry transfer, will be credited to the account maintained with the Book-Entry Transfer Facility by the participant who delivered the Shares, to the tendering stockholder promptly after the expiration or termination of the Offer at our expense.

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Under no circumstances will interest be paid on the Final Purchase Price for the Shares, regardless of any delay in making payment. In addition, if certain events occur, we may not be obligated to purchase Shares pursuant to the Offer. See Section 7.

We will pay all share transfer taxes, if any, payable on the transfer to us of Shares purchased pursuant to the Offer; provided, however, that if payment of the Final Purchase Price is to be made to, or (in the circumstances permitted by the Offer) if unpurchased Shares are to be registered in the name of, any person other than the registered holder, or if tendered certificates are registered in the name of any person other than the person signing the Letter of Transmittal, the amount of all share transfer taxes, if any (whether imposed on the registered holder or the other person), will be payable on account of the transfer to that person unless evidence satisfactory to us of the payment of the share transfer taxes, or exemption from payment of the share transfer taxes, is submitted. See Instruction 7 of the Letter of Transmittal.

In the event of an over-subscription of the Offer, Shares tendered at or below the Final Purchase Price prior to the Expiration Date will be subject to proration (subject to the exception for Odd Lot Holders). See Section 1. As discussed in Section 14, the number of Shares to be purchased from a particular stockholder may affect the tax treatment of the purchase to the stockholder and the stockholder’s decision whether to tender.

Accordingly, a stockholder may tender Shares subject to the condition that a specified minimum number of the stockholder’s Shares tendered pursuant to a Letter of Transmittal must be purchased if any Shares tendered are purchased. Any stockholder desiring to make a conditional tender must so indicate in the box entitled “Conditional Tender” in the Letter of Transmittal, and, if applicable, in the Notice of Guaranteed Delivery. We urge each stockholder to consult with his or her own financial or tax advisor with respect to the advisability of making a conditional tender.

Any tendering stockholder wishing to make a conditional tender must calculate and appropriately indicate the minimum number of Shares that must be purchased from that stockholder if any are to be purchased. After the Offer expires, if the number of Shares properly tendered and not properly withdrawn pursuant to the Offer at a price equal to or less than the Final Purchase Price and pursuant to the “Shares Tendered At Price Determined Under The Offer” alternative is greater than 7,500,000 Shares (or such greater number as we may elect to purchase, subject to applicable law) so that we must prorate our acceptance of and payment for tendered Shares, we will calculate a preliminary proration percentage based upon all Shares properly tendered, conditionally or unconditionally (including Shares of Odd Lot Holders). If the effect of this preliminary proration would be to reduce the number of Shares to be purchased from any stockholder below the minimum number specified, the conditional tender will automatically be regarded as withdrawn (except as provided in the next paragraph). All Shares tendered by a stockholder subject to a conditional tender pursuant to the Letter of Transmittal and regarded as withdrawn as a result of proration will be returned promptly after the Expiration Date.

After giving effect to these withdrawals, we will accept the remaining Shares properly tendered, conditionally or unconditionally, at or below the Final Purchase Price on a pro rata basis, if necessary. If conditional tenders would otherwise be regarded as withdrawn and would cause the total number of Shares to be purchased to fall below 7,500,000 (or such greater number as we may elect to purchase, subject to applicable law) then, to the extent feasible, we will select for purchase, by random lot selection, enough of the conditional tenders that would otherwise have been deemed withdrawn to permit us to purchase such number of Shares.

Notwithstanding any other provision of the Offer, we will not be required to accept for payment, purchase or pay for any Shares tendered, and we may terminate or amend the Offer or may postpone the acceptance for payment of or the payment for Shares tendered, subject to Exchange Act Rule 13e-4(f)(5), which requires that we must

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pay the consideration offered or return the Shares tendered promptly after termination or withdrawal of the Offer, if, at any time on or after the commencement of the Offer and prior to the Expiration Date, any of the following events have occurred (or are determined by us to have occurred) that, in our reasonable judgment and regardless of the circumstances giving rise to the event or events (including any action or inaction by us), makes it inadvisable to proceed with the Offer or with acceptance for payment or payment for the Shares in the Offer:

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If any of the conditions referred to above is not satisfied, we may:

The conditions referred to above are for our sole benefit and may be asserted by us regardless of the circumstances giving rise to any such condition, and may be waived by us, in whole or in part, at any time and from time to time in our reasonable discretion on or prior to the Expiration Date, subject to applicable laws. Our

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failure at any time to exercise any of the foregoing rights will not be deemed a waiver of any right, and each such right will be deemed an ongoing right that may be asserted at any time and from time to time. In certain circumstances, if we waive any of the conditions described above, we may be required to extend the Expiration Date. Any determination by us concerning the events described above will be final and binding on all parties. See Section 15.

The Shares are listed and traded on Nasdaq under the trading symbol “CORT.” The following table sets forth, for the fiscal quarters indicated, the high and low composite per Share prices of the Shares on Nasdaq:

We have never paid dividends on our common stock.

On March 3, 2023, one trading day before the commencement of the Offer, the last closing sale price of the Shares on Nasdaq was $19.20 per Share. Stockholders are urged to obtain current market quotations for the Shares.

Through a modified “Dutch auction” tender offer, which expired one minute after 11:59 p.m., New York City time, on December 15, 2021, we accepted for purchase in December 2021 an aggregate of 10,000,000 shares of our common stock at a purchase price of $20.75 per share, for an aggregate purchase price of $207,500,000, excluding fees and expenses relating to the tender offer.

We intend to pay for the Shares and fees and expenses applicable to the Offer with cash on hand or with proceeds from the sale of available-for-sale securities.

General

We are a commercial-stage company engaged in the discovery and development of drugs to treat severe endocrine, oncologic, metabolic and neurological disorders by modulating the effects of the hormone cortisol. Since 2012, we have marketed Korlym (mifepristone) for the treatment of patients suffering from Cushing’s syndrome. Our portfolio of proprietary selective cortisol modulators consists of four structurally distinct series totaling more than 1,000 compounds.

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Corcept Therapeutics Incorporated was incorporated under Delaware law in 1998. The address and phone number for our principal executive offices are: 149 Commonwealth Drive, Menlo Park, CA 94025 (telephone number: (650) 327-3270). Our website is located at http://www.corcept.com. Information contained on our website is not a part of the Offer.

Availability of Reports and Other Information

We are subject to the informational filing requirements of the Exchange Act, which obligate us to file reports, statements and other information with the SEC relating to our business, financial condition and other matters. Information, as of particular dates, concerning our directors and officers, their remuneration, options granted to them, the principal holders of our securities and any material interest of these persons in transactions with us is required to be disclosed in proxy statements distributed to our stockholders and filed with the SEC. As required by Exchange Act Rule 13e-4(c)(2), we have also filed with the SEC the Schedule TO, which includes additional information relating to the Offer.

These reports, statements and other information, including the Schedule TO and documents incorporated by reference, are available to the public on the SEC’s site at https://www.sec.gov. This website address is not intended to function as a hyperlink, and the information contained on the SEC’s website is not incorporated by reference in this Offer to Purchase and it should not be considered to be a part of this Offer to Purchase.

Incorporation by Reference

The rules of the SEC allow us to “incorporate by reference” information into this document, which means that we can disclose important information to you by referring you to another document filed separately with the SEC. The following documents contain important information about us, and we incorporate them by reference (other than any portions of the respective filings that were furnished to, rather than filed with, the SEC under applicable SEC rules):

Any statement contained in any document incorporated by reference into this Offer to Purchase shall be deemed to be modified or superseded to the extent that an inconsistent statement is made in this Offer to Purchase or any subsequently filed document. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Offer to Purchase.

You can obtain any of the documents incorporated by reference in this document from us or from the SEC’s website at the address described above. Documents incorporated by reference are available from us without charge, excluding any exhibits to those documents, at our principal executive offices located at Corporate Secretary, Corcept Therapeutics Incorporated, 149 Commonwealth Drive, Menlo Park, CA 94025. Please be sure to include your complete name and address in your request. If you request any incorporated documents, we will promptly mail them to you by first class mail, or another equally prompt means. You may also find additional information by visiting our website at http://www.corcept.com. Information on our website does not form part of the Offer and is not incorporated by reference in this Offer to Purchase.

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A list of our directors and executive officers as of March 6, 2023, is attached to this Offer to Purchase as Schedule I.

Beneficial Ownership

As of February 21, 2023, we had 107,899,316 issued and outstanding Shares. The 7,500,000 Shares that we are offering to purchase hereunder represent approximately 7% of the total number of our issued and outstanding Shares as of February 21, 2023. If the Offer is fully subscribed, we would have approximately 100,399,316 Shares outstanding immediately following the purchase of Shares tendered in the Offer. The actual number of Shares outstanding immediately following completion of the Offer will depend on the number of Shares tendered and purchased in the Offer.

Our directors and executive officers are entitled to participate in the Offer on the same basis as all other stockholders. However, our directors and executive officers have informed us that they will not tender any of their Shares in the Offer.

The following table sets forth certain information with respect to the beneficial ownership of our Shares by each of our directors and executive officers, individually and as a group (15 persons), as of February 21, 2023. The number of Shares beneficially owned is determined under rules of the SEC. The information is not necessarily indicative of beneficial ownership for any other purpose. Under these rules, beneficial ownership includes any Shares as to which the individual has either sole or shared voting power or investment power and also any Shares that the individual has the right to acquire within 60 days through the exercise of any stock option or other right. The individuals set forth in the table below, collectively, beneficially own approximately 19% of our outstanding Shares as of February 21, 2023.

Assuming we purchase 7,500,000 Shares and that our directors and executive officers do not tender any Shares pursuant to the Offer, then, after the Offer, our directors and executive officers as a group will beneficially own approximately 20% of the total issued and outstanding Shares.

Unless otherwise indicated in the footnotes, each person has sole voting and investment power with respect to the Shares set forth in the following table:

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Securities Transactions

Based on our records and on information provided to us by our directors, executive officers, affiliates and subsidiaries, neither we nor our subsidiaries, nor, to the best of our knowledge, any of our directors, executive officers, or affiliates has effected any transactions involving the Shares during the 60 days prior to the date hereof, except for the following transactions:

Arrangements Concerning the Shares

Equity Award Plans. We are authorized to grant stock options and other cash and stock awards under the 2004 Equity Incentive Plan and 2012 Incentive Award Plan. The Compensation Committee of our Board of Directors determines the recipients of the equity awards, the type of awards, the required performance measures, and the timing and duration of each grant. As of February 21, 2023, an aggregate of 8,441,169 Shares remained available for future awards under our equity incentive plans, 25,283,018 Shares were subject to currently outstanding options and 675,515 Shares were subject to currently outstanding restricted stock units and restricted stock awards.

Director Equity Compensation. For 2021 and 2022, new directors were granted an option to purchase 60,000 shares of common stock. The initial director options vest with respect to 25 percent of the shares on the first anniversary of the date of the grant and, in 36 equal monthly installments thereafter, subject to the director’s continued service on each monthly vesting date. At each annual meeting of our stockholders, continuing directors are granted an option, which for each of 2021 and 2022, covered 20,000 shares of common stock that vests in 12 equal monthly installments from the date of the annual meeting, subject to the director’s continued service on each monthly vesting date. The Board has historically approved option awards for directors serving certain

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leadership roles. In each of 2021 and 2022, the Board granted Mr. Wilson an option to purchase 45,000 shares of common stock, vesting in 12 monthly installments, for his service as Chairman of the Board, subject to his continued service on each monthly vesting date.

We have also entered into a Severance and Change in Control Agreement with Mr. Wilson. The agreement with Mr. Wilson provides that if his employment or service on the Board is terminated involuntarily by us without “cause” or by him for “good reason” (as each is defined in the agreement) within 18 months following a change in control, all of his outstanding equity awards shall become fully vested. Mr. Wilson will only receive vesting acceleration under this agreement if he signs and does not revoke a separation agreement and release of claims in a form reasonably acceptable to the Company within 60 days following termination of employment.

Severance and Change in Control Agreements. We have entered into severance and change in control agreements with our executive officers, including Dr. Belanoff who is also a member of our Board of Directors. The agreements provide that, if employment of any executive officer is terminated without cause or for good reason regardless of whether it is in connection with a change in control, the executive will continue to receive, for 12 months, his or her base salary and continued health insurance coverage. The agreements also provide for full vesting of the terminated executive’s outstanding equity awards in the event the termination occurs, with or without cause, within 18 months following a change in control.

The foregoing descriptions of agreements and arrangements involving the Shares are qualified in their entirety by reference to the text of the respective agreements and arrangements, copies of which have been filed with the SEC.

Share Repurchase Authorization. After completing the Offer, we may consider from time to time various means of returning additional excess capital to stockholders, including additional open market purchases, tender offers, privately negotiated transactions and/or accelerated share repurchases after taking into account our results of operations, financial position and capital requirements, general business conditions, legal, tax and regulatory constraints or restrictions, any contractual restrictions and other factors we deem relevant.

Rule 13e-4 under the Exchange Act generally prohibits us and our affiliates from purchasing any Shares, other than in the Offer, until at least ten business days after the Expiration Date, except pursuant to certain limited exceptions provided in Exchange Act Rule 14e-5. There can be no assurance that we will repurchase shares in the future.

We are not aware of any license or regulatory permit that is reasonably likely to be material to our business that might be adversely affected by our acquisition of Shares as contemplated in the Offer or of any approval or other action by any government or governmental, administrative or regulatory authority or agency, domestic, foreign or supranational, that would be required for our acquisition or ownership of Shares as contemplated by the Offer. Should any approval or other action be required, we presently contemplate that we will seek that approval or other action, but we have no current intention to delay the purchase of Shares tendered pursuant to the Offer pending the outcome of any such matter, subject to our right to decline to purchase Shares if any of the conditions in Section 7 have occurred or are deemed by us to have occurred or have not been waived. We cannot predict whether we would be required to delay the acceptance for payment of or payment for Shares tendered pursuant to the Offer pending the outcome of any such matter. We cannot assure you that any approval or other action, if needed, would be obtained or would be obtained without substantial cost or conditions or that the failure to obtain the approval or other action might not result in adverse consequences to our business and financial condition. If certain types of adverse actions are taken with respect to the matters discussed above, or certain approvals, consents, licenses or permits identified above are not obtained, we can decline to accept for payment or pay for any Shares tendered. See Section 7.

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The following discussion is a summary of certain U.S. federal income tax considerations of participating in the Offer. This discussion applies only to beneficial owners of Shares that are “Non-U.S. Holders,” or “U.S. Holders,” each as defined below, that hold Shares as “capital assets” within the meaning of Section 1221 of the U.S. Internal Revenue Code of 1986, as amended (the “Code”) (generally, property held for investment). This discussion is based upon the provisions of the Code, Treasury regulations promulgated thereunder, administrative rulings and judicial decisions, all as of the date hereof, which are subject to change or differing interpretations, possibly with retroactive effect. We have not sought any ruling from the Internal Revenue Service (the “IRS”) with respect to the statements made and the conclusions reached in the following summary, and there can be no assurance that the IRS will agree with such statements and conclusions and participation in the Offer may result in a different tax result than what is stated in the Offer.

This discussion also does not address the tax considerations arising under the laws of any U.S. state or local or any non-U.S. jurisdiction, the Medicare tax on net investment income or any alternative minimum tax consequences. In addition, this discussion does not address tax considerations applicable to an investor’s particular circumstances or to investors that may be subject to special tax rules, including, without limitation:

This summary also does not address the tax consequences of transactions effectuated before, after, or concurrently with the Offer (whether or not any such transactions are consummated in connection with the Offer), including, without limitation, any transaction in which Shares are involved, or the tax consequences to holders of any other interest in the Company, including options or similar rights to acquire Shares.

In addition, this discussion does not address the tax treatment of partnerships or other entities or arrangements that are pass-through entities for U.S. federal income tax purposes or persons that hold Shares through

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partnerships or other pass-through entities or arrangements. Accordingly, partnerships or other passthrough entities or arrangements that hold Shares and partners in such partnerships or pass-through entities or arrangements should consult their tax advisors regarding the U.S. federal income tax consequences to them.

As used herein, the term “U.S. Holder” means a beneficial owner of Shares that, for U.S. federal income tax purposes, is or is treated as any of the following:

As used herein, a “Non-U.S. Holder” is a beneficial holder of Shares that is neither a “U.S. Holder” nor an entity treated as a partnership for U.S. federal income tax purposes.

Investors are urged to consult their own tax advisors with respect to the application of the U.S. federal income tax laws to their particular situation, as well as any tax consequences to them of participating in the Offer arising under U.S. federal estate or gift tax rules or under the laws of any U.S. state or local or any non-U.S. or other taxing jurisdiction or under any applicable tax treaty.

U.S. Holders

Non-Tendering U.S. Holders

The Offer generally will not result in any U.S. federal income tax consequences to non-tendering U.S. Holders.

Tender of Shares Pursuant to the Offer

Characterization of the Purchase—Distribution vs. Sale Treatment. The exchange of Shares for cash pursuant to the Offer will be a taxable transaction for U.S. federal income tax purposes. A U.S. Holder that participates in the Offer will be treated, depending on such U.S. Holder’s particular circumstances, either as recognizing gain or loss from the disposition of the Shares or as receiving a distribution from us as described in more detail below.

Under the stock redemption rules of Section 302 of the Code, a U.S. Holder will recognize gain or loss on an exchange of Shares for cash if the exchange: (a) results in a “complete redemption” of all such U.S. Holder’s equity interest in the Company, (b) results in a “substantially disproportionate” redemption with respect to such U.S. Holder, or (c) is “not essentially equivalent to a dividend” with respect to the U.S. Holder (together, the “Section 302 tests”). In applying the Section 302 tests, a U.S. Holder must take into account stock that such U.S. Holder constructively owns under certain attribution rules, pursuant to which the U.S. Holder will be treated as owning Shares owned by certain family members (except that in the case of a “complete redemption” a U.S. Holder may waive, under certain circumstances, attribution from family members) and related entities and Shares that the U.S. Holder has the right to acquire by exercise of an option. An exchange of Shares for cash will be a substantially disproportionate redemption with respect to a U.S. Holder if (i) the percentage of voting stock owned (directly and by attribution) by such U.S. Holder in the Company immediately after the exchange (and other exchanges made pursuant to the Offer) is less than 80% of the same percentage owned (directly and by attribution) by such U.S. Holder in the Company immediately before the exchange (and other exchanges made pursuant to the Offer) and (ii) the percentage (determined by reference to fair market value) of the then-outstanding common stock (voting or nonvoting) owned (directly and by attribution) by such U.S. Holder in the Company immediately after the exchange (and other exchanges made pursuant to the Offer) is less than 80% of

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the same percentage owned (directly and by attribution) by such U.S. Holder in the Company immediately before the exchange (and other exchanges made pursuant to the Offer). If an exchange of Shares for cash fails to satisfy the “substantially disproportionate” test, the U.S. Holder nonetheless may satisfy the “not essentially equivalent to a dividend” test. An exchange of Shares for cash will generally satisfy the “not essentially equivalent to a dividend” test if it results in a “meaningful reduction” of the U.S. Holder’s equity interest in the Company. An exchange of Shares for cash that results in any reduction of the proportionate equity interest in the Company held by a U.S. Holder with a relative equity interest that is minimal and who does not exercise any control over or participate in the Company’s management should generally be treated as “not essentially equivalent to a dividend.” U.S. Holders are urged to consult their tax advisors regarding the application of the rules of Section 302 in their particular circumstances.

We cannot predict whether any particular U.S. Holder will be subject to sale or exchange treatment, on the one hand, or distribution treatment, on the other hand. Contemporaneous dispositions or acquisitions of Shares (pursuant to the Offer or otherwise, including market sales and purchases) by a U.S. Holder or related individuals or entities may be deemed to be part of a single integrated transaction and may be taken into account in determining whether the Section 302 tests have been satisfied. Each U.S. Holder should be aware that because proration may occur in the Offer, even if all the Shares actually and constructively owned by a U.S. Holder are tendered pursuant to the Offer, fewer than all of such Shares may be purchased by us. Consequently, we cannot assure you that a sufficient number of any particular U.S. Holder’s Shares will be purchased to ensure that this purchase will be treated as a sale or exchange, rather than as a distribution, for U.S. federal income tax purposes pursuant to the rules discussed herein. Accordingly, a tendering U.S. Holder may choose to submit a “conditional tender” under the procedures described in Section 6, which allows the U.S. Holder to tender Shares subject to the condition that a specified minimum number of the U.S. Holder’s Shares must be purchased by us if any such Shares so tendered are purchased.

Sale or Exchange Treatment. If a U.S. Holder is treated under the Section 302 tests as recognizing gain or loss from the “sale or exchange” of the Shares for cash, such gain or loss will be equal to the difference, if any, between the amount of cash received and such U.S. Holder’s tax basis in the Shares exchanged therefor. Generally, a U.S. Holder’s tax basis in the Shares will be equal to the cost of the Shares to the U.S. Holder reduced by any previous returns of capital. Any gain or loss will be capital gain or loss and will be long-term capital gain or loss if the holding period of the Shares by such tendering U.S. Holder exceeds one year as of the date of the exchange. Long-term capital gain is currently subject to a reduced rate of tax for non-corporate U.S. Holders (including individuals). The deductibility of capital losses is subject to limitations. A U.S. Holder must calculate gain or loss separately for each block of Shares (generally, Shares acquired at the same cost in a single transaction). A U.S. Holder may be able to designate which blocks of Shares it wishes to tender and the order in which different blocks will be purchased in the event that less than all of its Shares are tendered. Holders of Shares that own separate blocks of Shares should consult their tax advisor with respect to these rules.

Distribution Treatment. If a U.S. Holder is not treated under the Section 302 tests as recognizing gain or loss from the “sale or exchange” of Shares for cash, the entire amount of cash received by such U.S. Holder pursuant to the Offer will be treated as a distribution by the Company with respect to the U.S. Holder’s Shares. The amount of any distribution made to a U.S. Holder with respect to Shares generally will be included in such holder’s gross income as dividend income in the year actually or constructively received by the Depositary, but only to the extent that the distribution is paid out of our current or accumulated earnings and profits (as determined under U.S. federal income tax principles). Distributions in excess of our current and accumulated earnings and profits will be treated first as a non-taxable return of capital, thereby reducing the U.S. Holder’s adjusted tax basis (but not below zero) in the Shares and thereafter as either long-term or short-term capital gain, as applicable. Any remaining tax basis in the Shares tendered will be transferred to any remaining Shares held by such U.S. Holder.

To the extent that cash received in exchange for Shares is treated as a dividend to a corporate U.S. Holder, (i) it generally will be eligible for a dividends-received deduction (subject to certain requirements and limitations) and

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(ii) it may be subject to the “extraordinary dividend” provisions of the Code. Corporate U.S. Holders should consult their tax advisors concerning the availability of the dividends-received deduction and the application of the “extraordinary dividend” provisions of the Code in their particular circumstances.

Non-U.S. Holders

Non-Tendering Non-U.S. Holders

The Offer generally will not result in any U.S. federal income tax consequences to non-tendering Non-U.S. Holders.

Tender of Shares Pursuant to the Offer

Sale or Exchange Treatment. Gain realized by a Non-U.S. Holder on a sale of Shares for cash pursuant to the Offer generally will not be subject to U.S. federal income tax if the sale is treated as a “sale or exchange” under the Section 302 tests described above under “U.S. Holders—Tender of Shares Pursuant to Offer—Characterization of the Purchase—Distribution vs. Sale Treatment” unless: (i) that gain is effectively connected with the conduct of a trade or business in the United States (and, if required by an applicable income tax treaty, is attributable to a U.S. permanent establishment) by a Non-U.S. Holder; (ii) the Non-U.S. Holder is a non-resident alien individual who is present in the United States for 183 days or more in the taxable year of that disposition, and certain other conditions are met; or (iii) the Company is or has been a “U.S. real property holding corporation” for U.S. federal income tax purposes (“USRPHC”). The Company believes that it is not, has not been during the applicable period, a USRPHC.

If a Non-U.S. Holder is an individual subject to clause (i) of the preceding paragraph, the Non-U.S. Holder will generally be subject to tax on a net income basis at the regular graduated U.S. federal income tax rates as if such Non-U.S. Holder were a United States person. If a Non-U.S. Holder is a corporation subject to clause (i) of the preceding paragraph, it will be subject to tax on a net income basis at the regular graduated U.S. federal income tax rates as if it were a United States person and, in addition, the Non-U.S. Holder may be subject to the branch profits tax at a rate equal to 30% of its effectively connected earnings and profits or at such lower rate as may be specified by an applicable income tax treaty. If the Non-U.S. Holder is an individual described in clause (ii) of the preceding paragraph, the Non-U.S. Holder will generally be subject to a flat 30% tax on the gain (or such lower rate as may be specified by an applicable income tax treaty), which may be offset by U.S. source capital losses even though the Non-U.S. Holder is not considered a resident of the United States, provided the Non-U.S. Holder has timely filed U.S. federal income tax returns with respect to such losses.

In the event we are determined to be a USRPHC, as long as our Shares are regularly traded on an established securities market, gain from the disposition of the Shares will be subject to taxation under clause (iii) only with respect to a Non-U.S. Holder that actually or constructively held more than 5% of our Shares at any time during the applicable period. If gain on the disposition of Shares were subject to taxation under clause (iii) above, the Non-U.S. Holder would be subject to regular United States federal income tax with respect to such gain in generally the same manner as a United States person.

Distribution Treatment. If a Non-U.S. Holder is not treated under the Section 302 tests as recognizing gain or loss on a “sale or exchange” of Shares for cash, the entire amount of cash received by such Non-U.S. Holder pursuant to the Offer (including any amount withheld, as discussed below) will be treated as a distribution by us with respect to the Non-U.S. Holder’s Shares. The treatment for U.S. federal income tax purposes of such distribution as a dividend, tax-free return of capital, or gain from the sale or exchange of shares will be determined in the manner described above under “U.S. Holders—Tender of Shares Pursuant to Offer—Distribution Treatment.” Except as described in the following paragraphs, to the extent that amounts received by the Non-U.S. Holder are treated as dividends, such dividends will be subject to U.S. federal withholding tax at a rate of 30% (or a lower rate specified in an applicable income tax treaty).

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If a Non-U.S. Holder is engaged in a trade or business in the United States and the dividend with respect to the Shares is effectively connected with the conduct of that trade or business (and, if required by an applicable income tax treaty, is attributable to a permanent establishment in the United States), then the Non-U.S. Holder generally will be subject to U.S. federal income tax on those dividends on a net income basis (although the dividends will be exempt from the 30% U.S. federal withholding tax, provided certain certification and disclosure requirements are satisfied) in the same manner as if received by a United States person as defined under the Code. Any such effectively connected income received by a non-U.S. corporation may be subject to an additional branch profits tax at a 30% rate (or lower applicable income tax treaty rate). To claim the exemption from withholding for income that is effectively connected with the Non-U.S. Holder’s trade or business within the United States, the Non-U.S. Holder must furnish to the Company’s paying agent a properly executed IRS W-8ECI (or applicable successor form).

A Non-U.S. Holder of Shares who wishes to claim the benefit of a reduced rate of U.S. withholding tax under an applicable treaty for dividends that are not effectively connected with the conduct of a trade or business within the United States must furnish to the Company’s paying agent a valid IRS Form W-8BEN or IRS Form W-8BEN-E (or applicable successor form) certifying that such holder is not a United States person as defined under the Code and such holder’s qualification for the reduced rate. A Non-U.S. Holder that is an individual and that wishes to claim a reduced tax rate under an applicable income tax treaty generally must include a Social Security Number (if applicable) or its individual Taxpayer Identification Number. Special certification and other requirements apply to certain Non-U.S. Holders that hold Shares through certain non-U.S. intermediaries or are pass-through entities rather than corporations or individuals. If a Non-U.S. Holder is eligible for a reduced rate of U.S. withholding tax pursuant to an applicable income tax treaty, it may obtain a refund of any excess amounts withheld by timely filing an appropriate claim for refund with the IRS.

Withholding For Non-U.S. Holders. Because, as described above, it is unclear whether the cash received by a Non-U.S. Holder in connection with the Offer will be treated (i) as proceeds of a sale or exchange or (ii) as a distribution, the Company intends to treat such payment as a dividend distribution for withholding purposes. Accordingly, payments to Non-U.S. Holders will be subject to withholding at a rate of 30% of the gross proceeds paid, unless the Non-U.S. Holder establishes an entitlement to a reduced or zero rate of withholding by timely completing, under penalties of perjury, the applicable IRS Form W-8. In order to obtain a reduced or zero rate of withholding pursuant to an applicable income tax treaty, a Non-U.S. Holder must deliver to the Depositary, before the payment is made to such Non-U.S. Holder, a properly completed and executed IRS Form W-8BEN (or other applicable IRS Form W-8) claiming such an exemption or reduction. In order to obtain an exemption from withholding on the grounds that the gross proceeds paid pursuant to the Offer are effectively connected with the conduct of a trade or business within the United States, a Non-U.S. Holder must deliver to the Depositary before the payment is made to it a properly completed and executed IRS Form W-8ECI. To the extent Non-U.S. Holders tender Shares held in a United States brokerage account or otherwise through a United States broker, dealer, commercial bank, trust company, or other nominee, such Non-U.S. Holders should consult such United States broker or other nominee and their own tax advisors to determine the particular withholding procedures that will be applicable to them.

A Non-U.S. Holder may be eligible to obtain a refund of all or a portion of any U.S. federal tax withheld if such stockholder meets the “complete redemption,” “substantially disproportionate” or “not essentially equivalent to a dividend” tests described above under “U.S. Holders— Tender of Shares Pursuant to Offer—Characterization of the Purchase—Distribution vs. Sale Treatment” or if the stockholder is entitled to a reduced or zero rate of withholding pursuant to any applicable income tax treaty and a higher rate was withheld.

Non-U.S. Holders are urged to consult their tax advisors regarding the U.S. federal income tax consequences of participation in the Offer, including the application of U.S. federal income tax withholding rules, eligibility for a reduction of or an exemption from withholding tax, and the procedures for obtaining any available refund, as well as the applicability and effect of state, local, foreign and other tax laws.

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Additional Withholding Tax on Payments Made to Foreign Accounts

Withholding taxes may be imposed under Sections 1471 to 1474 of the Code (such Sections commonly referred to as the Foreign Account Tax Compliance Act (“FATCA”)) on certain types of payments made to non-U.S. financial institutions and certain other non-U.S. entities. Specifically, a 30% withholding tax may be imposed on dividends on our Shares (including, for this purpose, any sale or exchange of Shares treated as a distribution for withholding purposes as described above under “Non-U.S. Holders—Tender of Shares Pursuant to Offer—Withholding For Non-U.S. Holders”), or (subject to the proposed Treasury Regulations discussed below) gross proceeds from the sale or other disposition of our Shares paid to a “foreign financial institution” or a “non-financial foreign entity” (each as defined in the Code), unless (1) the foreign financial institution undertakes certain diligence, reporting and withholding obligations, (2) the non-financial foreign entity either certifies it does not have any “substantial United States owners” (as defined in the Code) or furnishes identifying information regarding each substantial United States owner, or (3) the foreign financial institution or non-financial foreign entity otherwise qualifies for an exemption from these rules. If the payee is a foreign financial institution and is subject to the diligence, reporting and withholding requirements in (1) above, it must enter into an agreement with the U.S. Department of the Treasury requiring, among other things, that it will undertake to identify accounts held by certain “specified United States persons” or “United States owned foreign entities” (each as defined in the Code), annually report certain information about such accounts and withhold 30% on certain payments to non-compliant foreign financial institutions and certain other account holders. Accordingly, the entity through which our Shares are held will affect the determination of whether such withholding is required. Foreign financial institutions located in jurisdictions that have an intergovernmental agreement with the United States governing FATCA may be subject to different rules.

The FATCA withholding tax will apply to all withholdable payments without regard to whether the beneficial owner of the payment would otherwise be entitled to an exemption from imposition of withholding tax pursuant to an applicable tax treaty with the United States or U.S. domestic law. The FATCA withholding tax generally will be creditable against the withholding described in “Non-U.S. Holders—Tender of Shares Pursuant to Offer”. Prospective investors should consult their tax advisors regarding the potential application of withholding under FATCA to their participation in the Offer.

Proposed U.S. Treasury Regulations have eliminated the application of FATCA withholding to payments of gross proceeds from the disposition of a stock interest in a domestic corporation (such as the Shares). Taxpayers generally may rely on these proposed Treasury Regulations until final Treasury Regulations are issued.

Non-U.S. Holders should consult with their tax advisors regarding the possible implications of these rules.

Backup Withholding and Information Reporting

In general, payments of the proceeds of an exchange of Shares pursuant to the Offer to U.S. Holders are subject to information reporting and U.S. Holders may be subject to backup withholding unless the U.S. Holder furnishes a correct taxpayer identification number and certifies that it is not subject to backup withholding on IRS Form W-9 (or successor form) or otherwise establishes that it is exempt from backup withholding. Each U.S. Holder is required to make such certifications by including a completed and signed copy of IRS Form W-9 that is included as part of the Letter of Transmittal.

Information returns are required to be filed with the IRS in connection with any distributions on the Shares paid to the Non-U.S. Holder, regardless of whether any tax was actually withheld. Copies of information returns that are filed with the IRS may also be made available under the provisions of an applicable treaty or agreement with the tax authorities of the country in which the Non-U.S. Holder resides or is established. Backup withholding, however, generally will not apply to the proceeds payable to a Non-U.S. Holder of Shares provided that the Non-U.S. Holder certifies its non-U.S. status, such as by furnishing to the Company or its paying agent a valid IRS Form W-8BEN, IRS Form W-8BEN-E or IRS Form W-8ECI, or otherwise establishes an exemption.

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Backup withholding is not an additional tax. Any amounts withheld under the backup withholding rules may be allowed as a refund or a credit against a Non-U.S. Holder’s U.S. federal income tax liability, provided the required information is timely furnished to the IRS. Each holder should consult with his, her or its tax advisors regarding the application of backup withholding in his, her or its particular circumstances and the availability of, and procedures for obtaining, an exemption from backup withholding under current Treasury Regulations.

THE TAX DISCUSSION SET FORTH ABOVE IS INCLUDED FOR GENERAL INFORMATION ONLY, IS NOT INTENDED TO CONSTITUTE A COMPLETE ANALYSIS OF ALL TAX CONSEQUENCES RELATING TO PARTICIPATING IN THE OFFER AND IS NOT TAX ADVICE. YOU ARE URGED TO CONSULT YOUR TAX ADVISOR TO DETERMINE THE PARTICULAR TAX CONSEQUENCES TO YOU OF THE OFFER, INCLUDING THE APPLICABILITY AND EFFECT OF STATE, LOCAL, FOREIGN AND OTHER TAX LAWS AND TREATIES.

We expressly reserve the right to extend the period of time the Offer is open and delay acceptance for payment of, and payment for, any Shares by giving oral or written notice of such extension to the Depositary and making a public announcement of such extension. During any such extension, all Shares previously tendered and not properly withdrawn will remain subject to the Offer and to the rights of a tendering stockholder to withdraw such stockholder’s Shares.

We also expressly reserve the right, in our sole discretion, not to accept for payment and not to pay for any Shares not previously accepted for payment or paid for, subject to applicable law, to postpone payment for Shares or terminate the Offer upon the occurrence of any of the conditions specified in Section 7 by giving oral or written notice of the termination or postponement to the Depositary and making a public announcement of the termination or postponement. Our reservation of the right to delay payment for Shares that we have accepted for payment is limited by Exchange Act Rule 13e-4(f)(5), which requires that we must pay the consideration offered or return the Shares tendered promptly after termination or withdrawal of the Offer.

Subject to compliance with applicable law, we further reserve the right, in our reasonable discretion, and regardless of whether any of the events set forth in Section 7 have occurred or are deemed by us to have occurred, to amend the Offer in any respect, including, without limitation, by changing the per Share purchase price range or by increasing or decreasing the number of Shares sought in the Offer. Amendments to the Offer may be made at any time and from time to time by public announcement of the amendment. In the case of an extension, the amendment shall be issued no later than 9:00 a.m., New York City time, on the next business day after the last previously scheduled or announced Expiration Date. Any public announcement made pursuant to the Offer will be disseminated promptly to stockholders in a manner reasonably designed to inform stockholders of the change. Without limiting the manner in which we may choose to make a public announcement, except as required by applicable law, we will have no obligation to publish, advertise or otherwise communicate any public announcement other than by issuing a press release to the PR Newswire or comparable service.

If we materially change the terms of the Offer or the information concerning the Offer, or if we waive a material condition of the Offer, we will extend the Offer to the extent required by Exchange Act Rules 13e-4(e)(3) and 13e-4(f)(1). This rule and related releases and interpretations of the SEC provide that the minimum period during which an Offer must remain open following material changes in the terms of the Offer or information concerning the Offer (other than a change in price or a change in percentage of securities sought) will depend on the facts and circumstances, including the relative materiality of the terms or information. If:

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In accordance with the rules of the SEC, if more than 7,500,000 Shares are tendered in the Offer at or below the Final Purchase Price, we may increase the number of Shares accepted for payment in the Offer by no more than 2% of the outstanding Shares without extending the Offer. See Section 1.

We have retained Piper Sandler & Co. to act as the Dealer Manager in connection with the Offer. The Dealer Manager may communicate with brokers, dealers, commercial banks and trust companies with respect to the Offer. The Dealer Manager will receive a reasonable and customary fee for these services, as well as customary expense reimbursement. We have also agreed to indemnify the Dealer Manager against liabilities in connection with the Offer, including liabilities under the federal securities laws.

In the ordinary course of business, including in their trading and brokerage operations and in a fiduciary capacity, the Dealer Manager and its affiliates may hold positions, both long and short, for their own accounts and for those of their customers, in our securities. The Dealer Manager may from time to time hold Shares in its proprietary accounts, and, to the extent it owns Shares in these accounts at the time of the Offer, the Dealer Manager may tender the Shares pursuant to the Offer.

We have retained D.F. King & Co., Inc. to act as Information Agent and Continental Stock Transfer & Trust Company to act as Depositary in connection with the Offer. The Information Agent may contact holders of Shares by mail, telephone, email and personal interviews and may request brokers, dealers, commercial banks, trust companies and other nominee stockholders to forward materials relating to the Offer to beneficial owners. The Information Agent and the Depositary will each receive reasonable and customary compensation for their respective services, will be reimbursed by us for reasonable out-of-pocket expenses and will be indemnified against certain liabilities in connection with the Offer.

We will not pay any fees or commissions to brokers, dealers, commercial banks, trust companies or other nominees (other than fees to the Dealer Manager, and the Information Agent as described above) for soliciting tenders of Shares pursuant to the Offer. Stockholders holding Shares through brokers, dealers, commercial banks, trust companies or other nominees are urged to consult the brokers, dealers, commercial banks, trust companies or other nominees to determine whether transaction costs may apply if stockholders tender Shares through the brokers, dealers, commercial banks, trust companies or other nominees and not directly to the Depositary. We will, however, upon request, reimburse brokers, dealers, commercial banks, trust companies or other nominees for customary mailing and handling expenses incurred by them in forwarding this Offer to Purchase, the Letter of Transmittal and related materials to the beneficial owners of Shares held by them as a nominee or in a fiduciary capacity. No broker, dealer, commercial bank, trust company or other nominee has been authorized to act as our agent or the agent of the Dealer Manager, the Information Agent or the Depositary for purposes of the Offer. We will pay or cause to be paid all share transfer taxes, if any, on our purchase of Shares except as otherwise provided in Section 5 hereof and Instruction 7 in the Letter of Transmittal.

On August 16, 2022, the Inflation Reduction Act of 2022 (the “IR Act”) was signed into federal law. The IR Act provides for, among other things, a new U.S. federal 1% excise tax on certain repurchases of stock by publicly traded U.S. domestic corporations and certain U.S. domestic subsidiaries of publicly traded foreign corporations occurring on or after January 1, 2023. The excise tax is imposed on the repurchasing corporation itself, not its shareholders from which shares are repurchased. The amount of the excise tax is generally 1% of the fair market value of the shares repurchased at the time of the repurchase. However, for purposes of calculating the excise tax, repurchasing corporations are permitted to net the fair market value of certain new stock issuances against the

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fair market value of stock repurchases during the same taxable year. In addition, certain exceptions apply to the excise tax. The U.S. Department of the Treasury (the “Treasury”) has been given authority to provide regulations and other guidance to carry out and prevent the abuse or avoidance of the excise tax. Any Share repurchase that occurs in connection with the Offer may be subject to the excise tax. Whether and to what extent we would be subject to the excise tax in connection with the Offer will depend on a number of factors, including, without limitation, (i) the fair market value of the repurchases in connection with the Offer, (ii) the fair market value of any capital stock repurchased by us in 2023 outside of the Offer, (iii) the deemed value of shares of capital stock we issue during 2023 and (iv) the content of regulations and other guidance from the Treasury.

We are not aware of any jurisdiction where the making of the Offer is not in compliance with applicable law. If we become aware of any jurisdiction where the making of the Offer or the acceptance of Shares pursuant to the Offer is not in compliance with any applicable law, we will make a good faith effort to comply with the applicable law. If, after a good faith effort, we cannot comply with the applicable law, the Offer will not be made to, nor will tenders be accepted from or on behalf of, the holders of Shares residing in that jurisdiction. In any jurisdiction where the securities, “blue sky” or other laws require the Offer to be made by a licensed broker or dealer, the Offer will be deemed to be made on our behalf by the Dealer Manager or one or more registered brokers or dealers licensed under the laws of the jurisdiction.

Pursuant to Exchange Act Rule 13e-4, we have filed with the SEC the Schedule TO, which contains additional information relating to the Offer. The Schedule TO, including the exhibits and any amendments thereto, may be examined, and copies may be obtained, at the same places and in the same manner set forth in Section 11 with respect to information concerning our company.

You should rely only on the information contained in this document or to which we have referred you. We have not authorized anyone to provide you with information or to make any representation on our behalf in connection with the Offer other than those contained in this Offer to Purchase and the related Letter of Transmittal. If given or made, you should not rely on that information or representation as having been authorized by us, any member of our Board of Directors, the Dealer Manager, the Depositary or the Information Agent.

OUR BOARD OF DIRECTORS HAS AUTHORIZED US TO MAKE THE OFFER. HOWEVER, NONE OF THE COMPANY, THE MEMBERS OF OUR BOARD OF DIRECTORS, THE DEALER MANAGER, THE INFORMATION AGENT OR THE DEPOSITARY HAS MADE ANY RECOMMENDATION AS TO WHETHER YOU SHOULD TENDER OR REFRAIN FROM TENDERING YOUR SHARES OR AS TO THE PURCHASE PRICE OR PURCHASE PRICES AT WHICH YOU MAY CHOOSE TO TENDER YOUR SHARES. NONE OF THE COMPANY, THE MEMBERS OF OUR BOARD OF DIRECTORS, THE DEALER MANAGER, THE INFORMATION AGENT OR THE DEPOSITARY HAS AUTHORIZED ANY PERSON TO MAKE ANY RECOMMENDATION ON OUR BEHALF AS TO WHETHER YOU SHOULD TENDER OR REFRAIN FROM TENDERING YOUR SHARES OR AS TO THE PURCHASE PRICE OR PURCHASE PRICES AT WHICH YOU MAY CHOOSE TO TENDER YOUR SHARES. NONE OF THE COMPANY, THE MEMBERS OF OUR BOARD OF DIRECTORS, THE DEALER MANAGER, THE INFORMATION AGENT OR THE DEPOSITARY HAS AUTHORIZED ANY PERSON TO GIVE ANY INFORMATION OR TO MAKE ANY REPRESENTATION IN CONNECTION WITH THE OFFER OTHER THAN THOSE CONTAINED IN THIS OFFER TO PURCHASE OR IN THE LETTER OF TRANSMITTAL. YOU SHOULD NOT RELY ON ANY RECOMMENDATION, OR ANY SUCH REPRESENTATION OR INFORMATION, AS HAVING BEEN AUTHORIZED BY US, ANY MEMBER OF OUR BOARD OF DIRECTORS, THE DEALER MANAGER, THE INFORMATION AGENT OR THE DEPOSITARY.

Corcept Therapeutics Incorporated

March 6, 2023

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SCHEDULE I

DIRECTORS AND EXECUTIVE OFFICERS OF CORCEPT THERAPEUTICS INCORPORATED

The following table sets forth the names and positions of the directors and executive officers of Corcept Therapeutics Incorporated. The address of each of our directors and executive officers is care of Corcept Therapeutics Incorporated, 149 Commonwealth Drive, Menlo Park, CA 94025 (telephone number: (650) 327-3270).

The Letter of Transmittal and certificates for Shares, and any other required documents should be sent or delivered by each stockholder or the stockholder’s broker, dealer, commercial bank, trust company or nominee to the Depositary at one of its addresses set forth below. To confirm delivery of Shares, stockholders are directed to contact the Depositary. Stockholders submitting certificates representing Shares to be tendered must deliver such certificates together with the Letter of Transmittal and any other required documents by mail or overnight courier. Facsimile copies of Share certificates will not be accepted.

The Depositary for the Offer is:

By Facsimile Transmission (for eligible institutions only): 212-616-7610

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Any questions or requests for assistance may be directed to the Information Agent or the Dealer Manager at their respective telephone numbers and addresses set forth on the following page. Requests for additional copies of this Offer to Purchase, this Letter of Transmittal, the Notice of Guaranteed Delivery or related documents may be directed to the Information Agent at its telephone number or address set forth below. You may also contact your broker, dealer, commercial bank, trust company or other nominee for assistance concerning the Offer.

The Information Agent for the Offer is:

D.F. King

D.F. King & Co., Inc.

48 Wall Street, 22nd Floor

New York, New York 10005

Stockholders, Banks and Brokers

Call: 1 (212) 269-5550

Call Toll Free: 1 (800) 821-8781

Email: cort@dfking.com

The Dealer Manager for the Offer is:

Piper Sandler & Co.

Piper Sandler & Co.

800 Nicollet Mall

Minneapolis, Minnesota 55402

Direct: Mark Cieciura

Email: Mark.cieciura@psc.com

(312) 267-5100

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EXHIBIT (a)(1)(B)

Letter of Transmittal

For Tender of Shares of Common Stock

Pursuant to the Offer to Purchase, Dated March 6, 2023

by

Corcept Therapeutics Incorporated

Up to 7,500,000 Shares of its Common Stock

At a Cash Purchase Price Not Greater than $22.00 per Share Nor Less than $19.25 per Share

The undersigned represents that I (we) have full authority to tender without restriction the Shares (as defined herein) listed below. You are hereby authorized and instructed to deliver to the address indicated below (unless otherwise instructed in the boxes in the following page) a check representing a cash payment for shares of common stock, par value $0.001 per share (each, a “Share,” and collectively, “Shares”), of Corcept Therapeutics Incorporated (the “Company,” “we,” “us” or “our”) tendered pursuant to this Letter of Transmittal, for purchase by us at a price calculated as described herein and in the Offer to Purchase (as defined below) that is a price not greater than $22.00 nor less than $19.25 per Share to the seller in cash, less any applicable withholding taxes and without interest, upon the terms and subject to the conditions in this Letter of Transmittal (together with any amendments and supplements thereto, this “Letter of Transmittal”), the Offer to Purchase, dated March 6, 2023 (together with any amendments or supplements thereto, the “Offer to Purchase”) and other related materials as may be amended or supplemented from time to time (collectively, with the Offer to Purchase and this Letter of Transmittal, the “Offer”).

THIS FORM SHOULD BE COMPLETED, SIGNED AND SENT TOGETHER WITH ALL OTHER DOCUMENTS, INCLUDING YOUR CERTIFICATES FOR SHARES TO CONTINENTAL STOCK TRANSFER & TRUST COMPANY (THE “DEPOSITARY”) AT ONE OF THE ADDRESSES SET FORTH BELOW. DELIVERY OF THIS LETTER OF TRANSMITTAL OR OTHER DOCUMENTS TO AN ADDRESS OTHER THAN AS SET FORTH BELOW DOES NOT CONSTITUTE VALID DELIVERY. DELIVERIES TO THE COMPANY, PIPER SANDLER & CO. (THE “DEALER MANAGER”), OR D.F. KING & CO., INC. (THE “INFORMATION AGENT”) WILL NOT BE FORWARDED TO THE DEPOSITARY AND THEREFORE WILL NOT CONSTITUTE VALID DELIVERY. DELIVERIES TO THE DEPOSITORY TRUST COMPANY WILL NOT CONSTITUTE VALID DELIVERY TO THE DEPOSITARY.

Method of delivery of the certificate(s) is at the option and risk of the owner thereof. See Instruction 2.

Mail or deliver this Letter of Transmittal, together with the certificate(s) representing your Shares, to:

Pursuant to the Offer to purchase up to 7,500,000 Shares, the undersigned encloses herewith and tenders the following certificates representing shares of the Company:

READ THE INSTRUCTIONS CAREFULLY BEFORE

COMPLETING THIS LETTER OF TRANSMITTAL.

YOU MUST SIGN THIS LETTER OF TRANSMITTAL WHERE INDICATED BELOW AND COMPLETE THE IRS FORM W-9 PROVIDED BELOW OR, IF APPROPRIATE, IRS FORM W-8.

This Letter of Transmittal (together with any amendments and supplements thereto, this “Letter of Transmittal”) is to be used either if certificates for shares of common stock, par value $0.001 per share (each, a “Share,” and collectively, “Shares”), of Corcept Therapeutics Incorporated (the “Company,” “we,” “us” or “our”) being tendered are to be forwarded with this Letter of Transmittal or, unless an Agent’s Message (defined below) is utilized, if delivery of Shares is to be made by book-entry transfer to an account maintained by Continental Stock Transfer & Trust Company, the depositary for the Offer (the “Depositary”), at The Depository Trust Company, which is referred to as the “Book-Entry Transfer Facility,” pursuant to the procedures set forth in Section 3 of the Offer to Purchase dated March 6, 2023 (together with any amendments or supplements thereto, the “Offer to Purchase,” and together with this Letter of Transmittal and other related materials, as each may be amended or supplemented from time to time, the “Offer”).

Tendering stockholders must deliver either the certificates for, or timely confirmation of book-entry transfer in accordance with the procedures described in Section 3 of the Offer to Purchase with respect to, their Shares and

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all other documents required by this Letter of Transmittal to the Depositary by one (1) minute after 11:59 p.m., New York City time, on March 31, 2023, unless we extend or terminate the Offer (such date and time, as they may be extended, the “Expiration Date”). When used together with a specific time, the term Expiration Date refers to the date on which the Offer expires.

Tendering stockholders whose certificates for Shares are not immediately available or who cannot deliver either the certificates for, or timely confirmation of book-entry in accordance with the procedures described in Section 3 of the Offer to Purchase with respect to, their Shares and all other documents required by this Letter of Transmittal to the Depositary by the Expiration Date must tender their Shares in accordance with the guaranteed delivery procedures set forth in Section 3 of the Offer to Purchase. All capitalized terms not otherwise defined herein have the meaning ascribed to them in the Offer to Purchase.

Your attention is directed in particular to the following:

METHOD OF DELIVERY

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PRICE (IN DOLLARS) PER SHARE AT WHICH SHARES ARE BEING TENDERED

(See Instruction 5)

THE UNDERSIGNED IS TENDERING SHARES AS FOLLOWS (CHECK ONLY ONE BOX UNDER (1) OR (2) BELOW).

BY CHECKING THE BOX BELOW INSTEAD OF ONE OF THE BOXES UNDER “Shares Tendered At Price Determined By Stockholder,” the undersigned hereby tenders Shares at the Final Purchase Price as shall be determined by the Company in accordance with the terms of and subject to the conditions of the Offer.

-OR-

BY CHECKING ONE OF THE FOLLOWING BOXES INSTEAD OF THE BOX UNDER “Shares Tendered At Price Determined Under The Offer,” the undersigned hereby tenders Shares at the price per Share checked. The undersigned understands that this action could result in the Company purchasing none of the Shares tendered hereby if you select a box other than the box representing a price at or below the Final Purchase Price as determined by the Company in accordance with the terms and subject to the conditions of the Offer.

4

A STOCKHOLDER DESIRING TO TENDER SHARES AT MORE THAN ONE PRICE MUST COMPLETE A SEPARATE LETTER OF TRANSMITTAL FOR EACH PRICE AT WHICH SHARES ARE TENDERED. THE SAME SHARES CANNOT BE TENDERED AT MORE THAN ONE PRICE UNLESS PREVIOUSLY PROPERLY WITHDRAWN AS PROVIDED IN SECTION 4 OF THE OFFER TO PURCHASE.

CHECK ONLY ONE BOX UNDER (1) OR (2) ABOVE. IF MORE THAN ONE BOX IS CHECKED ABOVE, OR IF NO BOX IS CHECKED, THERE IS NO VALID TENDER OF SHARES.

ODD LOTS

(See Instruction 14)

As described in Section 1 of the Offer to Purchase, under certain conditions, stockholders holding less than 100 Shares may have their Shares accepted for payment before any proration of other tendered Shares. This preference is not available to partial tenders, or to beneficial or record holders of an aggregate of 100 or more Shares, even if such holders have separate accounts or certificates representing less than 100 Shares.

Accordingly, this section is to be completed ONLY if Shares are being tendered by or on behalf of a person owning, beneficially or of record, an aggregate of less than 100 Shares. The undersigned certifies that it either (check one box):

CONDITIONAL TENDER

(See Instruction 13)

A stockholder may tender Shares subject to the condition that a specified minimum number of the stockholder’s Shares tendered pursuant to the Letter of Transmittal must be purchased if any Shares tendered are purchased, all as described in the Offer to Purchase and particularly in Section 6 of the Offer to Purchase. Unless at least the minimum number of Shares indicated below is purchased by the Company pursuant to the terms of the Offer, none of the Shares tendered will be purchased. It is the tendering stockholder’s responsibility to calculate that minimum number of Shares that must be purchased if any are purchased, and the Company urges stockholders to consult their own financial and tax advisors before completing this section. Unless this box has been checked and a minimum specified, the tender will be deemed unconditional.

If, because of proration, the minimum number of Shares designated will not be purchased, the Company may accept conditional tenders by random lot, if necessary. However, to be eligible for purchase by random lot, the tendering stockholder must have tendered all of his or her Shares and checked this box:

5

LOST OR DESTROYED CERTIFICATE(S)

IF ANY SHARE CERTIFICATE REPRESENTING SHARES THAT YOU OWN HAS BEEN LOST, STOLEN OR DESTROYED, PLEASE CONTACT CONTINENTAL STOCK TRANSFER & TRUST COMPANY (“CONTINENTAL”) AS THE TRANSFER AGENT AT (917) 262-2378 PROMPTLY TO OBTAIN INSTRUCTIONS AS TO THE STEPS THAT MUST BE TAKEN IN ORDER TO REPLACE THE CERTIFICATE. THIS LETTER OF TRANSMITTAL AND RELATED DOCUMENTS CANNOT BE PROCESSED UNTIL THE PROCEDURES FOR REPLACING LOST OR DESTROYED CERTIFICATES HAVE BEEN FOLLOWED. PLEASE CONTACT CONTINENTAL IMMEDIATELY TO PERMIT TIMELY PROCESSING OF THE REPLACEMENT DOCUMENTATION. SEE INSTRUCTION 12.

NOTE: SIGNATURES MUST BE PROVIDED WHERE INDICATED BELOW. PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY.

Ladies and Gentlemen:

The undersigned hereby tenders to Corcept Therapeutics Incorporated, a Delaware corporation (the “Company,” “we,” “us” or “our”), the above-described shares, par value $0.001 per share, of the Company’s shares of its common stock (each, a “Share,” and collectively, “Shares”) at the price per Share indicated in this Letter of Transmittal, in cash, less any applicable withholding taxes and without interest, upon the terms and subject to the conditions set forth in the Company’s Offer to Purchase, dated March 6, 2023 (together with any amendments or supplements thereto, the “Offer to Purchase”), this Letter of Transmittal (together with any amendments or supplements thereto, this “Letter of Transmittal”) and other related materials as may be amended or supplemented from time to time (collectively, with the Offer to Purchase and this Letter of Transmittal, the “Offer”), receipt of which is hereby acknowledged.

Subject to and effective on acceptance for payment of, and payment for, Shares tendered pursuant to this Letter of Transmittal in accordance with the terms and subject to the conditions of the Offer, the undersigned hereby agrees to sell, assign and transfer to the Company, or upon the order of the Company will sell, assign and transfer to the Company, all right, title and interest in and to all Shares that are being tendered hereby, to the full extent of the undersigned’s rights with respect to such tendered Shares to:

The undersigned hereby represents and warrants that the undersigned:

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All authority conferred or agreed to be conferred pursuant to this Letter of Transmittal shall be binding on the successors, assigns, heirs, personal representatives, executors, administrators and other legal representatives of the undersigned and shall not be affected by, and shall survive, the death or incapacity of the undersigned. Except as stated in the Offer to Purchase, this tender is irrevocable.

The undersigned understands that:

This single per Share price (the “Final Purchase Price”) will be the lowest single purchase price, not greater than $22.00 nor less than $19.25 per Share, that would allow the Company to purchase (i) 7,500,000 Shares, if 7,500,000 or more Shares are properly tendered and not properly withdrawn, or (ii) all Shares properly tendered and not properly withdrawn in the event that fewer than 7,500,000 Shares are properly tendered and not properly withdrawn.

7

The undersigned agrees to all of the terms and conditions of the Offer.

Unless otherwise indicated below in the box captioned “Special Payment Instructions,” please issue the check for the purchase price for Shares accepted for payment (less any applicable withholding taxes) in the name(s) of, and/or return any certificates for Shares not properly tendered or accepted for payment to, the name(s) of the registered holder(s) appearing under “Description of Shares Tendered.” Similarly, unless otherwise indicated under “Special Delivery Instructions,” please mail the check for the purchase price for Shares accepted for payment (less any applicable withholding taxes) and/or return any certificates for Shares not properly tendered or accepted for payment (and accompanying documents, as appropriate) to the address(es) of the registered owner(s) appearing under “Description of Shares Tendered.”

In the event that both the “Special Delivery Instructions” and the “Special Payment Instructions” are completed, please issue the check for payment of the purchase price (less any applicable withholding taxes) for Shares

8

accepted for payment and/or return any certificates for Shares not tendered or accepted for payment (and any accompanying documents, as appropriate) in the name(s) of, and deliver such check and/or return such certificates (and any accompanying documents, as appropriate) to, the person or persons so indicated. Unless otherwise indicated in the box captioned “Special Payment Instructions,” please credit any Shares properly tendered herewith by book-entry transfer that are not accepted for payment by crediting the account at the Book-Entry Transfer Facility designated above. Appropriate medallion signature guarantees by an Eligible Institution (as defined in Instruction 1) have been included with respect to Shares for which Special Payment Instructions have been given. The undersigned recognizes that the Company has no obligation pursuant to the “Special Payment Instructions” to transfer any Shares from the name of the registered holder(s) thereof if the Company does not accept for payment any of Shares so properly tendered.

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Complete accompanying IRS Form W-9 or appropriate IRS Form W-8.

GUARANTEE OF SIGNATURE(S)

(For use by Eligible Institutions only;

see Instructions 1 and 6)

NOTE: A notarization by a notary public is not acceptable.

PLACE MEDALLION GUARANTEE IN SPACE BELOW.

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INSTRUCTIONS

Forming Part of the Terms and Conditions of the Offer

Tenders of Shares made pursuant to the Offer may be withdrawn at any time prior to the Expiration Date. If, following the Expiration Date, we have not accepted for payment the Shares you have tendered to us by one minute after 11:59 P.M., New York City time, on April 28, 2023, the 40th business day from the commencement of the Offer, you may also withdraw your Shares at any time thereafter. To withdraw tendered Shares, stockholders must deliver a written notice of withdrawal to the Depositary within the prescribed time period at one of the addresses set forth in this Letter of Transmittal.

Any notice of withdrawal must specify the name of the tendering stockholder, the number of Shares to be withdrawn, and the name of the registered holder of such Shares. In addition, if the certificates for Shares to be withdrawn have been delivered or otherwise identified to the Depositary, then, before the release of the certificates, the tendering stockholder must also submit the serial numbers shown on the particular certificates for Shares to be withdrawn and the signature(s) on the notice of withdrawal must be guaranteed by an Eligible Institution (except in the case of Shares tendered by an Eligible Institution). If Shares have been tendered pursuant to the procedures for book-entry transfer, the notice of withdrawal also must specify the name and the number of the account at the Book-Entry Transfer Facility to be credited with the withdrawn Shares and otherwise comply with the procedures of that facility. Withdrawals may not be rescinded and any Shares withdrawn will not be properly tendered for purposes of the Offer unless the withdrawn Shares are properly re-tendered prior to the Expiration Date by following the procedures described above.

11

Stockholders whose certificates for Shares are not immediately available or who cannot deliver their certificates and all other required documents to the Depositary or complete the procedures for book-entry transfer prior to the Expiration Date may tender their Shares by properly completing and duly executing the Notice of Guaranteed Delivery pursuant to the guaranteed delivery procedures set forth in Section 3 of the Offer to Purchase. Pursuant to those procedures, (a) tender must be made by or through an Eligible Institution, (b) a properly completed and duly executed Notice of Guaranteed Delivery, substantially in the form provided by the Company, must be received by the Depositary prior to the Expiration Date and (c) the certificates for all tendered Shares in proper form for transfer (or a book-entry confirmation with respect to all such Shares), together with a Letter of Transmittal, properly completed and duly executed, with any required signature guarantees, or, in the case of a book-entry transfer, an Agent’s Message, and any other required documents, must be received by the Depositary, in each case, within two trading days after the date of execution of the Notice of Guaranteed Delivery as provided in Section 3 of the Offer to Purchase. A “trading day” is any day on which the Nasdaq Stock Market is open for business. The term “Agent’s Message” means a message transmitted by the Book-Entry Transfer Facility to, and received by, the Depositary, which states that the Book-Entry Transfer Facility has received an express acknowledgment from the participant in the Book-Entry Transfer Facility tendering Shares that such participant has received and agrees to be bound by the terms of the Letter of Transmittal and that the Company may enforce such agreement against the participant.

THE METHOD OF DELIVERY OF SHARES, THIS LETTER OF TRANSMITTAL AND ANY OTHER REQUIRED DOCUMENTS, INCLUDING DELIVERY THROUGH THE BOOK-ENTRY TRANSFER FACILITY, IS AT THE SOLE ELECTION AND RISK OF THE TENDERING STOCKHOLDER. SHARES, AND THIS LETTER OF TRANSMITTAL AND ALL OTHER DOCUMENTS WILL BE DEEMED DELIVERED ONLY WHEN ACTUALLY RECEIVED BY THE DEPOSITARY (INCLUDING, IN THE CASE OF A BOOK-ENTRY TRANSFER, BY BOOK-ENTRY CONFIRMATION). WHEN DELIVERING BY MAIL, WE RECOMMEND THAT YOU USE REGISTERED MAIL WITH RETURN RECEIPT REQUESTED, AND THAT YOU PROPERLY INSURE THE DOCUMENTS. IN ALL CASES, YOU SHOULD ALLOW SUFFICIENT TIME TO ENSURE TIMELY DELIVERY.

Except as specifically provided by the Offer to Purchase, no alternative, conditional or contingent tenders will be accepted. No fractional Shares will be purchased. All tendering stockholders, by execution of this Letter of Transmittal, waive any right to receive any notice of the acceptance for payment of their Shares.

12

ONLY ONE BOX UNDER (1) OR (2) MAY BE CHECKED. IF MORE THAN ONE BOX IS CHECKED OR IF NO BOX IS CHECKED, THERE IS NO PROPER TENDER OF SHARES. A STOCKHOLDER WISHING TO TENDER PORTIONS OF SUCH STOCKHOLDER’S SHARE HOLDINGS AT DIFFERENT PRICES MUST COMPLETE A SEPARATE LETTER OF TRANSMITTAL FOR EACH PRICE AT WHICH SUCH STOCKHOLDER WISHES TO TENDER EACH SUCH PORTION OF SUCH STOCKHOLDER’S SHARES. The same Shares cannot be tendered more than once, unless previously properly withdrawn as provided in Section 4 of the Offer to Purchase, at more than one price.

If any of the Shares tendered hereby are owned of record by two or more joint owners, all such persons must sign this Letter of Transmittal.

If any Shares tendered hereby are registered in different names on several certificates, it will be necessary to complete, sign and submit as many separate Letters of Transmittal as there are different registrations of certificates.

If this Letter of Transmittal or any certificate or stock power is signed by a trustee, executor, administrator, guardian, attorney-in-fact, officer of a corporation or other person acting in a fiduciary or representative capacity, he or she should so indicate when signing and submit proper evidence satisfactory to the Company of his or her authority to so act.

If this Letter of Transmittal is signed by the registered owner(s) of Shares tendered hereby, no endorsements of certificates or separate stock powers are required unless payment of the purchase price is to be made, or certificates for Shares not tendered or accepted for payment are to be issued, to a person other than the registered owner(s). Signatures on any such certificates or stock powers must be guaranteed by an Eligible Institution.

If this Letter of Transmittal is signed by a person other than the registered owner(s) of Shares tendered hereby, the certificate(s) representing such Shares must be properly endorsed for transfer or accompanied by appropriate stock powers, in either case, signed exactly as the name(s) of the registered owner(s) appear(s) on the certificates(s). The signature(s) on any such certificate(s) or stock power(s) must be guaranteed by an Eligible Institution.

Except as provided in this Instruction 7, it will not be necessary for transfer tax stamps to be affixed to the certificates listed in this Letter of Transmittal.

13

A “U.S. Holder” is any stockholder that for U.S. federal income tax purposes is (i) an individual that is a U.S. citizen or U.S. resident alien, (ii) a partnership, corporation, company or association created or organized in the United States or under the laws of the United States, (iii) an estate (other than a foreign estate), or (iv) a domestic trust (as defined in Treasury Regulations Section 301.7701-7).

If a partnership (including an entity or arrangement treated as a partnership or other pass-thru entity for U.S. federal income tax purposes) holds Shares, the tax treatment of a partner, member or other beneficial owner in such partnership will generally depend upon the status of the partner, member or other beneficial owner, the activities of the partnership and certain determinations made at the partner, member or other beneficial owner level. If you are a partner, member or other beneficial owner of a partnership holding Shares, you are urged to consult with your tax advisor regarding the tax consequences of the purchase, ownership and disposition of Shares.

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Backup withholding is not an additional tax. Rather, the amount of the backup withholding can be credited against the U.S. federal income tax liability of the person subject to the backup withholding, provided that the required information is timely filed with the IRS. If backup withholding results in an overpayment of tax, a refund can be obtained upon timely filing an income tax return.

If Shares are held in more than one name or are not in the name of the actual owner, consult the instructions to the enclosed IRS Form W-9 for guidance on which number to report. If a U.S. Holder has not been issued a TIN and has applied for one or intends to apply for one in the near future, such U.S. Holder should consult the instructions to the enclosed IRS Form W-9 for guidance on how to complete IRS Form W-9.

Non-U.S. Holders (as defined below) must provide the Depositary or other applicable withholding agent with a duly completed and properly executed IRS Form W-8BEN, W-8BEN-E or other applicable IRS Form W-8 in order to avoid backup withholding. A copy of the appropriate IRS Form W-8 may be obtained from the Depositary or from the IRS website (www.irs.gov). A “Non-U.S. Holder” is a stockholder that is not a U.S. Holder.

Each Holder is urged to consult its tax advisors for further guidance regarding the completion of IRS Form W-9, IRS Form W-8BEN, IRS Form W-8BEN-E or another version of IRS Form W-8 to claim exemption from backup withholding.

If you wish to make a conditional tender you must indicate this in the box captioned “Conditional Tender” in this Letter of Transmittal and, if applicable, the Notice of Guaranteed Delivery. In this box in this Letter of Transmittal and, if applicable, the Notice of Guaranteed Delivery, you must calculate and appropriately indicate the minimum number of Shares that must be purchased if any are to be purchased.

As discussed in Sections 3 and 6 of the Offer to Purchase, proration may affect whether the Company accepts conditional tenders and may result in Shares tendered pursuant to a conditional tender being deemed withdrawn if the minimum number of Shares would not be purchased. Upon the terms and subject to the conditions of the Offer, if, because of proration (because more than the number of Shares sought are properly tendered), the minimum number of Shares that you designate will not be purchased, the Company may accept conditional tenders made at or below the Final Purchase Price by random lot, if necessary. However, to be eligible for purchase by random lot, you must have tendered all of your Shares and check the box so indicating. Upon selection by lot, if any, the Company will limit its purchase in each case to the designated minimum number of Shares.

All tendered Shares will be deemed unconditionally tendered unless the “Conditional Tender” box is completed. If you are an Odd Lot Holder (as defined in the Offer to Purchase) and you tender all of your Shares, you cannot conditionally tender, because your Shares will not be subject to proration.

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The conditional tender alternative is made available so that a stockholder may seek to structure the purchase of Shares pursuant to the Offer in such a manner that the purchase will be treated as a sale of such Shares by the stockholder, rather than the payment of a dividend to the stockholder, for U.S. federal income tax purposes. It is the tendering stockholder’s responsibility to calculate the minimum number of Shares that must be purchased from the stockholder in order for the stockholder to qualify for sale rather than dividend treatment. Each stockholder is urged to consult his or her own tax advisor. See Section 6 of the Offer to Purchase.

IMPORTANT: THIS LETTER OF TRANSMITTAL, TOGETHER WITH ANY REQUIRED SIGNATURE GUARANTEES, OR, IN THE CASE OF A BOOK-ENTRY TRANSFER, AN AGENT’S MESSAGE, AND ANY OTHER REQUIRED DOCUMENTS, MUST BE RECEIVED BY THE DEPOSITARY PRIOR TO THE EXPIRATION DATE, AND EITHER CERTIFICATES FOR TENDERED SHARES MUST BE RECEIVED BY THE DEPOSITARY OR SHARES MUST BE DELIVERED PURSUANT TO THE PROCEDURES FOR BOOK-ENTRY TRANSFER, IN EACH CASE, PRIOR TO THE EXPIRATION DATE, OR THE TENDERING STOCKHOLDER MUST COMPLY WITH THE PROCEDURES FOR GUARANTEED DELIVERY.

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EXHIBIT (a)(1)(C)

Notice of Guaranteed Delivery

For Tender of Shares of Common Stock of

Corcept Therapeutics Incorporated

This Notice of Guaranteed Delivery, or a form substantially equivalent hereto, must be used to accept the Offer (as defined below) if you want to tender your Shares but:

in which case, you can still tender your Shares if you comply with the guaranteed delivery procedures described in Section 3 of the Offer to Purchase, dated March 6, 2023 (together with any amendments or supplements thereto, the “Offer to Purchase”).

This Notice of Guaranteed Delivery, properly completed and duly executed, may be delivered to the Depositary by mail, overnight courier or email in accordance with the procedures set forth in the Offer to Purchase prior to the Expiration Date. See Section 3 of the Offer to Purchase.

Deliver to:

the Depositary for the Offer

By Facsimile Transmission (for eligible institutions only): 212-616-7610

For this Notice of Guaranteed Delivery to be validly delivered, it must be received by the Depositary at one of the above addresses, or by email, prior to the Expiration Date. Delivery of this instrument to an address other than as set forth above will not constitute a valid delivery. Deliveries to the Company, Piper Sandler & Co., the Dealer Manager for the Offer, or D.F. King & Co., Inc., the Information Agent, will not be forwarded to the Depositary and therefore will not constitute valid delivery. Deliveries to The Depository Trust Company will not constitute valid delivery to the Depositary.

This Notice of Guaranteed Delivery is not to be used to guarantee signatures. If a signature on the Letter of Transmittal is required to be guaranteed by an Eligible Institution under the instructions to the Letter of Transmittal, the signature guarantee must appear in the applicable space provided in the signature box on the Letter of Transmittal.

Ladies and Gentlemen:

The undersigned hereby tenders to Corcept Therapeutics Incorporated, a Delaware corporation (the “Company”), upon the terms and subject to the conditions set forth in its Offer to Purchase, dated March 6, 2023 (together with any amendments or supplements thereto, the “Offer to Purchase”), the related Letter of Transmittal (together with any amendments or supplements thereto, the “Letter of Transmittal”) and other related materials as may be amended or supplemented from time to time (collectively, with the Offer to Purchase and the Letter to Transmittal, the “Offer”), receipt of which is hereby acknowledged by the undersigned, the number of shares of common stock of the Company, par value $0.001 per share (each, a “Share,” and collectively, “Shares”), listed below pursuant to the guaranteed delivery procedures set forth in Section 3 of the Offer to Purchase. Capitalized terms used herein and not defined herein shall have the meanings given to them in the Offer to Purchase. Participants should notify the Depositary prior to covering through the submission of a physical security directly to the Depositary based on a guaranteed delivery that was submitted via The Depository Trust Company’s PTOP platform.

Number of Shares to be tendered: Shares.

NOTE: SIGNATURES MUST BE PROVIDED WHERE INDICATED BELOW

PRICE (IN DOLLARS) PER SHARE AT WHICH SHARES ARE BEING TENDERED

(See Instruction 5 to the Letter of Transmittal)

THE UNDERSIGNED IS TENDERING SHARES AS FOLLOWS (CHECK ONLY ONE BOX UNDER

(1) OR (2) BELOW):

BY CHECKING THE BOX BELOW INSTEAD OF ONE OF THE BOXES UNDER “Shares Tendered At Price Determined By Shareholder,” the undersigned hereby tenders Shares at the Final Purchase Price (as defined in the Offer to Purchase) as shall be determined by the Company in accordance with the terms of and subject to the conditions of the Offer.

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-OR-

BY CHECKING ONE OF THE FOLLOWING BOXES INSTEAD OF THE BOX UNDER “Shares Tendered At Price Determined Under the Offer,” the undersigned hereby tenders Shares at the price per Share checked. The undersigned understands that this action could result in the Company purchasing none of the Shares tendered hereby if you select a box other than the box representing a price at or below the Final Purchase Price as determined by the Company in accordance with the terms and subject to the conditions of the Offer.

CHECK ONLY ONE BOX UNDER (1) OR (2) ABOVE. IF MORE THAN ONE BOX IS CHECKED ABOVE, OR IF NO BOX IS CHECKED, THERE IS NO VALID TENDER OF SHARES.

A SHAREHOLDER DESIRING TO TENDER SHARES AT MORE THAN ONE PRICE MUST COMPLETE A SEPARATE INSTRUCTION FORM FOR EACH PRICE AT WHICH SHARES ARE TENDERED. THE SAME SHARES CANNOT BE TENDERED AT MORE THAN ONE PRICE UNLESS PREVIOUSLY PROPERLY WITHDRAWN AS PROVIDED IN SECTION 4 OF THE OFFER TO PURCHASE.

ODD LOTS

(See Instruction 14 of the Letter of Transmittal)

As described in Section 1 of the Offer to Purchase, under certain conditions, shareholders holding less than 100 Shares may have their Shares accepted for payment before any proration of other tendered Shares. This preference is not available to partial tenders, or to beneficial or record holders of an aggregate of 100 or more Shares, even if such holders have separate accounts or certificates representing less than 100 Shares.

Accordingly, this section is to be completed ONLY if Shares are being tendered by or on behalf of a person owning, beneficially or of record, an aggregate of less than 100 Shares. The undersigned certifies that it either (check one box):

CONDITIONAL TENDER

(See Instruction 13 of the Letter of Transmittal)

A shareholder may tender Shares subject to the condition that a specified minimum number of the shareholder’s Shares tendered pursuant to the Letter of Transmittal must be purchased if any Shares tendered are purchased, all as described in the Offer to Purchase and particularly in Section 6 thereof. Unless at least that minimum number of Shares indicated below is purchased by the Company pursuant to the terms of the Offer, none of the Shares

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tendered by you will be purchased. It is the tendering shareholder’s responsibility to calculate that minimum number of Shares that must be purchased if any are purchased, and the Company urges shareholders to consult their own financial or tax advisors before completing this section. Unless this box has been checked and a minimum specified, the tender will be deemed unconditional.

If, because of proration, the minimum number of Shares designated will not be purchased, the Company may accept conditional tenders by random lot, if necessary. However, to be eligible for purchase by random lot, the tendering shareholder must have tendered all of his or her Shares and checked this box:

PLEASE SIGN ON THIS PAGE

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GUARANTEE

(NOT TO BE USED FOR SIGNATURE GUARANTEE)

The undersigned, a bank, broker, dealer, credit union, savings association or other entity which is a member in good standing of the Securities Transfer Association Medallion Signature Guarantee Program, or an “eligible guarantor institution” (as such term is defined in Rule 17Ad-15 promulgated under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) (an “Eligible Institution”), hereby guarantees: (i) that the above-named person(s) “own(s)” and has or have a net long position in the Shares being tendered within the meaning of Rule 14e-4 promulgated under the Exchange Act, (ii) that such tender of Shares complies with Rule 14e-4 and (iii) it will deliver to the Depositary (at one of its addresses set forth above) certificate(s) for the Shares tendered hereby, in proper form for transfer, or a confirmation of the book-entry transfer of the Shares into the Depositary’s account at The Depository Trust Company together with a properly completed and duly executed Letter of Transmittal (or a manually signed email thereof) and any other required documents, within two (2) trading days (as defined in the Letter of Transmittal) after the date of receipt by the Depositary of this Notice of Guaranteed Delivery.

The Eligible Institution that completes this form must communicate the guarantee to the Depositary and must deliver the Letter of Transmittal and certificates for Shares to the Depositary within the time period shown herein. Failure to do so could result in financial loss to such Eligible Institution. Participants should notify the Depositary prior to covering through the submission of a physical security directly to the Depositary based on a guaranteed delivery that was submitted via The Depository Trust Company’s PTOP platform.

This form is not to be used to guarantee signatures. If a signature on a Letter of Transmittal is required to be guaranteed by an Eligible Institution under the instructions thereto, such signature guarantee must appear in the applicable space provided in the signature box on the Letter of Transmittal.

NOTE: DO NOT SEND SHARE CERTIFICATES WITH THIS FORM. YOUR SHARE CERTIFICATES MUST BE SENT WITH THE LETTER OF TRANSMITTAL.

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EXHIBIT (a)(1)(D)

Offer to Purchase for Cash

by

Corcept Therapeutics Incorporated

Up to 7,500,000 Shares of its Common Stock

At a Cash Purchase Price Not Greater than $22.00 per Share Nor Less than $19.25 per Share

March 6, 2023

To Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees:

Corcept Therapeutics Incorporated, a Delaware corporation (the “Company”), has appointed us to act as Dealer Manager in connection with its offer to purchase for cash up to 7,500,000 shares of common stock, par value $0.001 per share (each, a “Share,” and collectively, “Shares”), at a price calculated as described herein and in the Offer to Purchase that is a price not greater than $22.00 nor less than $19.25 per Share to the seller in cash, less any applicable withholding taxes and without interest, upon the terms and subject to the conditions set forth in the Offer to Purchase, dated March 6, 2023 (together with any amendments or supplements thereto, the “Offer to Purchase”), the related Letter of Transmittal (together with any amendments or supplements thereto, the “Letter of Transmittal”) and other related materials as may be amended or supplemented from time to time (collectively, with the Offer to Purchase and the Letter to Transmittal, the “Offer”).

The Company will, upon the terms and subject to the conditions of the Offer, determine a single per Share price that it will pay for Shares properly tendered and not properly withdrawn from the Offer, taking into account the total number of Shares properly tendered and the prices specified, or deemed specified, by tendering stockholders. This single per Share price (the “Final Purchase Price”) will be the lowest single purchase price, not greater than $22.00 nor less than $19.25 per Share, that would allow the Company to purchase (i) 7,500,000 Shares, if 7,500,000 or more Shares are properly tendered and not properly withdrawn, or (ii) all Shares properly tendered and not properly withdrawn in the event that fewer than 7,500,000 Shares are properly tendered and not properly withdrawn.

Capitalized terms used herein and not defined herein shall have the meanings given to them in the Offer to Purchase. The description of the Offer in this letter is only a summary and is qualified by the terms and conditions of the Offer set forth in the Offer to Purchase, the Letter of Transmittal and other related materials.

The Company will not purchase any Shares tendered at prices in excess of the Final Purchase Price. When used together with a specific time, the term “Expiration Date” refers to the date on which the Offer expires. Upon the terms and subject to the conditions of the Offer, if 7,500,000 Shares or fewer are properly tendered and not properly withdrawn, the Company will purchase all Shares properly tendered at or below the Final Purchase Price and not properly withdrawn prior to the Expiration Date. Only Shares properly tendered at prices at or below the Final Purchase Price, and not properly withdrawn, will be purchased in the Offer upon the terms of and subject to the conditions of the Offer (including the “Odd Lot” priority, proration and conditional tender provisions described in the Offer to Purchase). Under no circumstances will interest be paid on the Final Purchase Price for the Shares regardless of any delay in making such payment. All Shares acquired in the Offer, if any, will be acquired at the Final Purchase Price. The Company reserves the right, in its sole discretion, to change the per Share purchase price range and to increase or decrease the number of Shares sought in the Offer, subject to applicable law. In accordance with the rules of the Securities and Exchange Commission, if more than

7,500,000 Shares are tendered in the Offer at or below the Final Purchase Price the Company may increase the number of Shares accepted for payment in the Offer by no more than 2% of the outstanding Shares, or increase the aggregate purchase price of Shares by no more than 2%, without extending the Offer.

The Company reserves the right, in its sole discretion, to (i) upon the occurrence of any of certain conditions to the Offer more specifically described in the Offer to Purchase, (a) terminate the Offer and return all tendered Shares to the tendering stockholders, (b) extend the Offer and, subject to the withdrawal rights set forth in the Offer to Purchase, retain all of the tendered Shares until the expiration of the Offer as so extended, (c) waive a condition to the Offer and, subject to any requirement to extend the period of time during which the Offer is open, purchase all of the Shares properly tendered and not properly withdrawn prior to the Expiration Date or (d) delay acceptance for payment of or payment for Shares, subject to applicable law, until satisfaction or waiver of such condition, or (ii) amend the Offer in any respect, subject to applicable law.

If the conditions to the Offer have been satisfied or waived and more than 7,500,000 Shares have been properly tendered and not properly withdrawn prior to the Expiration Date, the Company will purchase Shares on the following basis:

(i) first, the Company will purchase all Odd Lots of less than 100 Shares at the Final Purchase Price from stockholders who properly tender all of their Shares at or below the Final Purchase Price and who do not properly withdraw them before the Expiration Date. Tenders of less than all of the Shares owned, beneficially or of record, by such Odd Lot Holder will not qualify for this preference;

(ii) second, after purchasing all Odd Lots that were properly tendered at or below the Final Purchase Price, subject to the conditional tender provisions described in the Offer to Purchase (whereby a holder may specify the minimum number of such holder’s Shares that must be purchased if any such Shares are purchased), the Company will purchase all Shares properly tendered at or below the Final Purchase Price on a pro rata basis with appropriate adjustment to avoid purchases of fractional Shares; and

(iii) third, only if necessary to permit the Company to purchase up to 7,500,000 Shares (or such greater amount the Company may elect to purchase, subject to applicable law), the Company will purchase Shares conditionally tendered (for which the condition was not initially satisfied) at or below the Final Purchase Price, by random lot, to the extent feasible. To be eligible for purchase by random lot, stockholders whose Shares are conditionally tendered must have tendered all of their Shares. Random lot will be facilitated by the Company.

As a result of the foregoing priorities applicable to the purchase of Shares properly tendered, it is possible that fewer than all Shares tendered by a stockholder will be purchased or that, if a tender is conditioned upon the purchase of a specified number of Shares, none of those Shares will be purchased even though those Shares were properly tendered at prices at or below the Final Purchase Price and not properly withdrawn. Shares not purchased in the Offer, including Shares tendered at prices in excess of the Final Purchase Price and Shares not purchased because of proration or conditional tender, will be returned to the tendering stockholders at the Company’s expense promptly after the Expiration Date. See Section 1, Section 3 and Section 5 of the Offer to Purchase.

The Offer is conditioned on at least 3,000,000 Shares being tendered. The Offer is also subject to certain other conditions. See Section 7 of the Offer to Purchase.

For your information and for forwarding to those of your clients for whom you hold Shares registered in your name or in the name of your nominee, we are enclosing the following documents:

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The Company’s Board of Directors has authorized the Company to make the Offer. However, none of the Company, the members of its Board of Directors, Piper Sandler & Co., the dealer manager for the Offer (the “Dealer Manager”), Continental Stock Transfer & Trust Company, the depositary for the Offer (the “Depositary”), or D.F. King & Co., Inc., the information agent for the Offer (the “Information Agent”), makes any recommendation to any stockholder as to whether to tender or refrain from tendering any Shares or as to the price or prices at which stockholders may choose to tender their Shares. None of the Company, the members of its Board of Directors, the Dealer Manager, the Depositary or the Information Agent has authorized any person to make any recommendation to you as to whether you should tender or refrain from tendering your Shares or as to the purchase price or purchase prices at which you may choose to tender your Shares. Stockholders should carefully evaluate all information in the Offer to Purchase and the Letter of Transmittal, and should consult their own financial and tax advisors. Stockholders must decide whether to tender or refrain from tendering their Shares and, if deciding to tender, how many Shares to tender and the price or prices at which they wish to tender. In doing so, a stockholder should read carefully the information in the Offer to Purchase and the Letter of Transmittal before making any decision with respect to the Offer.

YOUR PROMPT ACTION IS REQUESTED. WE URGE YOU TO CONTACT YOUR CLIENTS AS PROMPTLY AS POSSIBLE. PLEASE NOTE THAT THE OFFER, PRORATION PERIOD AND WITHDRAWAL RIGHTS EXPIRE ONE (1) MINUTE AFTER 11:59 P.M., NEW YORK CITY TIME, ON MARCH 31, 2023, UNLESS THE OFFER IS EXTENDED.

For Shares to be tendered properly pursuant to the Offer, one of the following must occur: (i) the certificates for such Shares, or confirmation of receipt of such Shares pursuant to the procedure for book-entry transfer set forth in Section 3 of the Offer to Purchase, together with (a) a properly completed and duly executed Letter of Transmittal, including any required signature guarantees and any documents required by the Letter of Transmittal, or (b) an Agent’s Message (as defined in Section 3 of the Offer to Purchase) in the case of a book-entry transfer, must be received before the Expiration Date by the Depositary at one of its addresses set forth on the back cover of the Offer to Purchase or (ii) stockholders whose certificates for Shares are not immediately available or who cannot deliver their certificates and all other required documents to the Depositary, or cannot complete the procedures for book-entry transfer prior to the Expiration Date, must properly complete and duly execute the Notice of Guaranteed Delivery pursuant to the guaranteed delivery procedures set forth in Section 3 of the Offer to Purchase.

The Company will not pay any fees or commissions to brokers, dealers, commercial banks or trust companies or other nominees (other than fees to the Dealer Manager, and the Information Agent, as described in Section 16 of the Offer to Purchase) for soliciting tenders of Shares pursuant to the Offer. The Company will, however, upon request, reimburse brokers, dealers (including, if applicable, and the Dealer Manager ), commercial banks, trust companies or other nominees for customary mailing and handling expenses incurred by them in forwarding the Offer and related materials to the beneficial owners of Shares held by them as a nominee or in a fiduciary capacity. No broker, dealer, commercial bank or trust company has been authorized to act as the agent of the Company, the Dealer Manager, the Information Agent or the Depositary for purposes of the Offer. The Company will pay or cause to be paid all stock transfer taxes, if any, on its purchase of the Shares except as otherwise provided in the Offer to Purchase or Instruction 7 in the Letter of Transmittal.

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Any inquiries you may have with respect to the Offer may be addressed to the Dealer Manager at the address and telephone number listed below.

Additional copies of the Offer to Purchase, the Letter of Transmittal and other related materials may also be obtained from the Information Agent for the Offer by calling toll-free at 1 (800) 821-8781.

Very truly yours,

Piper Sandler & Co.

NOTHING CONTAINED IN THIS DOCUMENT OR IN THE ENCLOSED DOCUMENTS WILL MAKE YOU OR ANY OTHER PERSON AN AGENT OF THE COMPANY, THE DEALER MANAGER, THE INFORMATION AGENT OR THE DEPOSITARY OR ANY AFFILIATE OF ANY OF THE FOREGOING, OR AUTHORIZE YOU OR ANY OTHER PERSON TO USE ANY DOCUMENT OR MAKE ANY STATEMENT ON BEHALF OF ANY OF THEM IN CONNECTION WITH THE OFFER OTHER THAN THE DOCUMENTS ENCLOSED AND THE STATEMENTS CONTAINED IN THOSE DOCUMENTS.

The Dealer Manager for the Offer is:

Piper Sandler & Co.

Piper Sandler & Co.

800 Nicollet Mall

Minneapolis, Minnesota 55402

Direct: Mark Cieciura

Email: Mark.cieciura@psc.com

(312) 267-5100

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EXHIBIT (a)(1)(E)

Offer to Purchase for Cash

by

Corcept Therapeutics Incorporated

Up to 7,500,000 Shares of its Common Stock

At a Cash Purchase Price Not Greater than $22.00 per Share Nor Less than $19.25 per Share

March 6, 2023

To Our Clients:

Enclosed for your consideration are the Offer to Purchase, dated March 6, 2023 (together with any amendments or supplements thereto, the “Offer to Purchase”), the related Letter of Transmittal (together with any amendments or supplements thereto, the “Letter of Transmittal”) and other related materials (together with any amendments or supplements thereto, the Offer to Purchase and the Letter of Transmittal, the “Offer”) in connection with the offer by Corcept Therapeutics Incorporation, a Delaware corporation (the “Company,” “we,” “us” or “our”), to purchase for cash up to 7,500,000 shares of its common stock, par value $0.001 per share (each, a “Share,” and collectively, “Shares”), at a price calculated as described herein and in the Offer to Purchase that is a price not greater than $22.00 nor less than $19.25 per Share to the seller in cash, less any applicable withholding taxes and without interest, upon the terms and subject to the conditions of the Offer.

The Company will, upon the terms and subject to the conditions of the Offer, determine a single per Share price that it will pay for Shares properly tendered and not properly withdrawn from the Offer, taking into account the total number of Shares properly tendered and the prices specified, or deemed specified (as described in the attached Instruction Form), by tendering stockholders. This single per Share price (the “Final Purchase Price”) will be the lowest single purchase price, not greater than $22.00 nor less than $19.25 per Share, that would allow the Company to purchase (i) 7,500,000 Shares, if 7,500,000 or more Shares are properly tendered and not properly withdrawn, or (ii) all Shares properly tendered and not properly withdrawn in the event that fewer than 7,500,000 Shares are properly tendered and not properly withdrawn.

Capitalized terms used herein and not defined herein shall have the meanings given to them in the Offer to Purchase. The description of the Offer in this letter is only a summary and is qualified by the terms and conditions of the Offer set forth in the Offer to Purchase, the Letter of Transmittal and other related materials.

The Company will not purchase any Shares tendered at prices in excess of the Final Purchase Price. When used together with a specific time, the term “Expiration Date” refers to the date on which the Offer expires. Upon the terms and subject to the conditions of the Offer, if 7,500,000 Shares or fewer are properly tendered and not properly withdrawn, the Company will purchase all Shares properly tendered at or below the Final Purchase Price and not properly withdrawn prior to the Expiration Date. Only Shares properly tendered at prices at or below the Final Purchase Price, and not properly withdrawn, will be purchased in the Offer in accordance with the terms and subject to the conditions of the Offer (including “Odd Lot” priority, proration and conditional tender provisions described in the Offer to Purchase). Under no circumstances will interest be paid on the Final Purchase Price for the Shares regardless of any delay in making such payment. All Shares acquired in the Offer, if any, will be acquired at the Final Purchase Price. The Company reserves the right, in its sole discretion, to change the per Share purchase price range and to increase or decrease the number of Shares sought in the Offer, subject to applicable law. In accordance with the rules of the Securities and Exchange Commission, if more than 7,500,000 Shares are tendered in the Offer at or below the Final Purchase Price the Company may increase the number of Shares accepted for payment in the Offer by no more than 2% of the outstanding Shares, or increase the aggregate purchase price of Shares by no more than 2%, without extending the Offer.

The Company reserves the right, in its sole discretion, to (i) upon the occurrence of any of certain conditions to the Offer more specifically described in the Offer to Purchase, (a) terminate the Offer and return all tendered Shares to the tendering stockholders, (b) extend the Offer and, subject to the withdrawal rights set forth in the Offer to Purchase, retain all of the tendered Shares until the expiration of the Offer as so extended, (c) waive a condition of the Offer and, subject to any requirement to extend the period of time during which the Offer is open, purchase all of the Shares properly tendered and not properly withdrawn prior to the Expiration Date or (d) delay acceptance for payment of or payment for Shares, subject to applicable law, until satisfaction or waiver of such condition, or (ii) amend the Offer in any respect, subject to applicable law.

If the conditions to the Offer have been satisfied or waived and more than 7,500,000 Shares have been properly tendered and not properly withdrawn prior to the Expiration Date, the Company will purchase Shares on the following basis:

(i) first, the Company will purchase all Odd Lots of less than 100 Shares at the Final Purchase Price from stockholders who properly tender all of their Shares at or below the Final Purchase Price and who do not properly withdraw them before the Expiration Date. Tenders of less than all of the Shares owned, beneficially or of record, by such Odd Lot Holder will not qualify for this preference;

(ii) second, after purchasing all Odd Lots that were properly tendered at or below the Final Purchase Price, subject to the conditional tender provisions described in the Offer to Purchase (whereby a holder may specify the minimum number of such holder’s Shares that must be purchased if any such Shares are purchased), the Company will purchase all Shares properly tendered at or below the Final Purchase Price on a pro rata basis with appropriate adjustment to avoid purchases of fractional Shares; and

(iii) third, only if necessary to permit the Company to purchase up to 7,500,000 Shares (or such greater amount the Company may elect to purchase, subject to applicable law), the Company will purchase Shares conditionally tendered (for which the condition was not initially satisfied) at or below the Final Purchase Price, by random lot, to the extent feasible. To be eligible for purchase by random lot, stockholders whose Shares are conditionally tendered must have tendered all of their Shares. Random lot will be facilitated by the Company.

As a result of the foregoing priorities applicable to the purchase of Shares properly tendered, it is possible that fewer than all Shares that you tendered will be purchased or that, if a tender is conditioned upon the purchase of a specified number of Shares, none of those Shares that you tendered will be purchased even though those Shares were properly tendered at prices at or below the Final Purchase Price and not properly withdrawn. Shares not purchased in the Offer, including Shares tendered at prices in excess of the Final Purchase Price and Shares not purchased because of proration or conditional tender, will be returned to you at the Company’s expense promptly after the Expiration Date. See Section 1, Section 3 and Section 5 of the Offer to Purchase.

The Offer is conditioned on at least 3,000,000 Shares being tendered. The Offer is also subject to certain other conditions. See Section 7 of the Offer to Purchase.

We are the owner of record of Shares held for your account. As such, we are the only ones who can tender your Shares, and we can tender your Shares only pursuant to your instructions. WE ARE SENDING YOU THE LETTER OF TRANSMITTAL AND OTHER TENDER OFFER MATERIALS FOR YOUR INFORMATION ONLY; YOU CANNOT USE IT OR ANY OTHER MATERIALS TO TENDER SHARES WE HOLD FOR YOUR ACCOUNT.

Please instruct us as to whether you wish us to tender any or all of the Shares we hold for your account in accordance with the terms and subject to the conditions of the Offer.

Please note the following:

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YOUR PROMPT ACTION IS REQUESTED. YOUR INSTRUCTION FORM SHOULD BE FORWARDED TO US WITH AMPLE TIME TO PERMIT US TO SUBMIT A TENDER ON YOUR BEHALF BEFORE THE EXPIRATION DATE. PLEASE NOTE THAT THE OFFER, PRORATION PERIOD AND WITHDRAWAL RIGHTS WILL EXPIRE AT ONE (1) MINUTE AFTER 11:59 P.M., NEW YORK CITY TIME, ON MARCH 31, 2023, UNLESS THE OFFER IS EXTENDED OR TERMINATED.

If you wish to have us tender any or all of your Shares, please so instruct us by completing, executing, detaching and returning the attached Instruction Form to us. If you authorize us to tender your Shares, we will tender all such Shares unless you specify otherwise on the attached Instruction Form.

The Offer is being made solely under the Offer to Purchase, the Letter of Transmittal and related materials, and is being made to all record holders of Shares. The Offer is not being made to, nor will tenders be accepted from or on behalf of, holders of Shares residing in any jurisdiction in which the making of the Offer or acceptance thereof will not be in compliance with the securities, “blue sky” or other applicable laws of such jurisdiction.

INSTRUCTION FORM

The undersigned acknowledge(s) receipt of your letter and the enclosed Offer to Purchase, dated March 6, 2023 (together with any amendments or supplements thereto, the “Offer to Purchase”), the related Letter of Transmittal (together with any amendments or supplements thereto, the “Letter of Transmittal”) and other

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related materials (together with any amendments or supplements thereto, the Offer to Purchase and the Letter of Transmittal, the “Offer”) in connection with the offer by Corcept Therapeutics Incorporated, a Delaware Corporation (the “Company”), to purchase up to 7,500,000 shares of common stock, par value $0.001 per share (each, a “Share,” and collectively, “Shares”), at a price calculated as described herein and in the Offer to Purchase that is a price not greater than $22.00 nor less than $19.25 per Share to the seller in cash, less any applicable withholding taxes and without interest, upon the terms and subject to the conditions of the Offer. Capitalized terms used herein and not defined herein shall have the meanings given to them in the Offer to Purchase.

The undersigned hereby instruct(s) you to tender to the Company the number of Shares indicated below, or, if no number is specified, all Shares you hold for the account of the undersigned, at the price per Share indicated below, upon the terms and subject to the conditions of the Offer.

Aggregate Number Of Shares To Be Tendered

By You For The Account Of The Undersigned: Shares.

PRICE (IN DOLLARS) PER SHARE AT WHICH SHARES ARE BEING TENDERED

(See Instruction 5 of the Letter of Transmittal)

THE UNDERSIGNED IS TENDERING SHARES AS FOLLOWS

(CHECK ONLY ONE BOX UNDER (1) OR (2) BELOW):

BY CHECKING THE BOX BELOW INSTEAD OF ONE OF THE BOXES UNDER “Shares Tendered At Price Determined By Stockholder,” the undersigned hereby tenders Shares at the Final Purchase Price as shall be determined by the Company in accordance with the terms and subject to the conditions of the Offer.

BY CHECKING ONE OF THE FOLLOWING BOXES INSTEAD OF THE BOX UNDER “Shares Tendered At Price Determined Under The Offer,” the undersigned hereby tenders Shares at the price per Share checked. The undersigned understands that this action could result in the Company purchasing none of the Shares tendered hereby if you select a box other than the box representing a price at or below the Final Purchase Price as determined by the Company in accordance with the terms and subject to the conditions of the Offer.

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CHECK ONLY ONE BOX UNDER (1) OR (2) ABOVE. IF MORE THAN ONE BOX IS CHECKED ABOVE, OR IF NO BOX IS CHECKED, THERE IS NO VALID TENDER OF SHARES.

A STOCKHOLDER DESIRING TO TENDER SHARES AT MORE THAN ONE PRICE MUST COMPLETE A SEPARATE INSTRUCTION FORM FOR EACH PRICE AT WHICH SHARES ARE TENDERED. THE SAME SHARES CANNOT BE TENDERED AT MORE THAN ONE PRICE UNLESS PREVIOUSLY PROPERLY WITHDRAWN AS PROVIDED IN SECTION 4 OF THE OFFER TO PURCHASE.

ODD LOTS

(See Instruction 14 of the Letter of Transmittal)

As described in Section 1 of the Offer to Purchase, under certain conditions, stockholders holding less than 100 Shares may have their Shares accepted for payment before any proration of other tendered Shares. This preference is not available to partial tenders, or to beneficial or record holders of an aggregate of 100 or more Shares, even if such holders have separate accounts or certificates representing less than 100 Shares.

Accordingly, this section is to be completed ONLY if Shares are being tendered by or on behalf of a person owning, beneficially or of record, an aggregate of less than 100 Shares. The undersigned certifies that it either (check one box):

CONDITIONAL TENDER

(See Instruction 13 of the Letter of Transmittal)

A stockholder may tender Shares subject to the condition that a specified minimum number of the stockholder’s Shares tendered pursuant to the Letter of Transmittal must be purchased if any Shares tendered are purchased, all as described in the Offer to Purchase and particularly in Section 6 thereof. Unless at least that minimum number of Shares indicated below is purchased by the Company pursuant to the terms of the Offer, none of the Shares tendered by you will be purchased. It is the tendering stockholder’s responsibility to calculate that minimum number of Shares that must be purchased if any are purchased, and the Company urges stockholders to consult their own financial or tax advisors before completing this section. Unless this box has been checked and a minimum specified, the tender will be deemed unconditional.

If, because of proration, the minimum number of Shares designated will not be purchased, the Company may accept conditional tenders by random lot, if necessary. However, to be eligible for purchase by random lot, the tendering stockholder must have tendered all of his or her Shares and checked this box:

The method of delivery of this document is at the election and risk of the tendering stockholder. If delivery is by mail, then registered mail with return receipt requested, properly insured, is recommended. In all cases, sufficient time should be allowed to ensure timely delivery.

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The Company’s Board of Directors has authorized the Company to make the Offer. However, none of the Company, any of the members of its Board of Directors, the Dealer Manager, the Information Agent or the Depositary makes any recommendation to stockholders as to whether they should tender or refrain from tendering their Shares or as to the purchase price or purchase prices at which any stockholder may choose to tender Shares. None of the Company, any of the members of its Board of Directors, the Dealer Manager, the Information Agent or the Depositary has authorized any person to make any recommendation to you as to whether you should tender or refrain from tendering your Shares or as to the purchase price or purchase prices at which you may choose to tender your Shares. Stockholders should carefully evaluate all information in the Offer to Purchase and in the Letter of Transmittal, consult their own financial and tax advisors and make their own decisions about whether to tender or refrain from tendering your Shares and, if deciding to tender, how many Shares to tender and the purchase price or purchase prices at which to tender.

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SIGNATURE

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EXHIBIT (a)(1)(F)

This announcement is neither an offer to purchase nor a solicitation of an offer to sell Shares (as defined below). The Offer (as defined below) is made solely pursuant to the Offer to Purchase, dated March 6, 2023, and the related Letter of Transmittal and Important Instructions and Information. The Offer is being made to all holders of Shares, provided that the Offer is not being made to, nor will tenders be accepted from or on behalf of, holders of Shares in any state in which making or accepting the Offer would violate that state’s laws. In any state where the securities, blue sky or other laws require the Offer to be made by a licensed broker or dealer, the Offer shall be deemed to be made on the Company’s behalf by Piper Sandler & Co., the Dealer Manager for the Offer, or by one or more registered brokers or dealers licensed under the laws of that state.

Notice of Offer to Purchase for Cash

by

CORCEPT THERAPEUTICS INCORPORATED

of

Up to 7,500,000 Shares of its Common Stock

at a Cash Purchase Price Not Greater Than

$22.00 Nor Less Than $19.25 Per Share

THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE ONE (1) MINUTE AFTER 11:59 P.M., NEW YORK CITY TIME, ON MARCH 31, 2023, UNLESS THE OFFER IS EXTENDED OR WITHDRAWN.

Corcept Therapeutics Incorporated, a Delaware corporation (the “Company”), invites its stockholders to tender shares of its common stock, par value $0.001 per share (the “Shares” or “Common Stock”), at a price or prices not greater than $22.00 nor less than $19.25 per Share, net to the tendering stockholder in cash, less the withholding of any applicable taxes and without interest, upon the terms and subject to the conditions described in the Offer to Purchase, dated March 6, 2023 (the “Offer to Purchase”), and in the related Letter of Transmittal and Important Instructions and Information (collectively with the Offer to Purchase, as each may be supplemented or amended from time to time, the “Offer”).

The Offer is conditioned on at least 3,000,000 shares being tendered. The Offer is also subject to certain other conditions. See Section 7—Conditions of the Offer of the Offer to Purchase.

The Offer will expire one (1) minute after 11:59 P.M., New York City time, on March 31, 2023, unless the Offer is extended or withdrawn (such date and time, as they may be extended, the “Expiration Date”).

Upon the terms and subject to the conditions of the Offer, which will be conducted through a modified “Dutch Auction” process, the Company will determine a single per Share price that the Company will pay for Shares properly tendered and not properly withdrawn from the Offer, taking into account the total number of Shares properly tendered and the prices specified, or deemed specified, by tendering stockholders. This single per Share price (the “Final Purchase Price”) will be the lowest single purchase price, not greater than $22.00 nor less than $19.25 per Share, that would allow us to purchase (i) 7,500,000 Shares, if 7,500,000 or more Shares are properly tendered and not properly withdrawn, or (ii) all Shares properly tendered and not properly withdrawn in the event that less than 7,500,000 Shares are properly tendered and not properly withdrawn.

Upon the terms and subject to the conditions of the Offer, if 7,500,000 Shares or less are properly tendered and not properly withdrawn, the Company will purchase, at the Final Purchase Price, all Shares properly tendered at or below the Final Purchase Price and not properly withdrawn prior to the Expiration Date. All Shares acquired,

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if any, in the Offer will be acquired at the Final Purchase Price, including those Shares tendered at a price lower than the Final Purchase Price. Only Shares properly tendered at prices at or below the Final Purchase Price, and not properly withdrawn, will be purchased. However, because of proration, “Odd Lot” priority and the conditional tender provisions described in the Offer to Purchase, the Company may not purchase all of the Shares tendered at or below the Final Purchase Price if more than 7,500,000 Shares are properly tendered and not properly withdrawn. Shares not purchased in the Offer will be returned to the tendering stockholders promptly after the Expiration Date.

The Company reserves the right to extend the Offer at any time and for any reason. If the Company extends the Offer beyond one (1) minute after 11:59 p.m., New York City Time, on March 31, 2023, the Company will inform D.F. King & Co., Inc. (“D.F. King”) of that fact and will issue a press release or other public announcement of the extension not later than 9:00 a.m., New York City Time, on the business day after the day on which the Offer was scheduled to expire.

To validly tender Shares, stockholders must do one of the following prior to the Expiration Date:

Tenders of Shares made pursuant to the Offer may be withdrawn at any time prior to the Expiration Date. After the Expiration Date, such tenders are irrevocable, except that they may be withdrawn anytime on or after April 28, 2023, the 40th business day from the commencement of the Offer, if such tendered Shares have not been accepted for payment prior to that time. If you are a registered holder of Shares, for a withdrawal to be effective, a notice of withdrawal, in written form, must be received in a timely manner by the Depositary at one of its addresses set forth on the back cover of the Offer to Purchase. Any notice of withdrawal must specify the name of the tendering stockholder, the number of Shares to be withdrawn and the name of the registered holder of the Shares. If certificates for Shares to be withdrawn have been delivered or otherwise identified to the Depositary, then, before the release of the certificates, the tendering stockholder must also submit the serial numbers shown on the particular certificates for Shares to be withdrawn and the signature(s) on the written notice of withdrawal must be guaranteed by an Eligible Institution (as defined in the Offer to Purchase) (except in the case of Shares tendered for the account of an Eligible Institution). If Shares have been tendered pursuant to the procedure for book-entry transfer described in Section 3—Procedures for Tendering Shares of the Offer to Purchase, the notice of withdrawal also must specify the name and the number of the account at the Book-Entry