UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934
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CHECKPOINT THERAPEUTICS, INC.

(Name of Registrant as Specified In Its Charter)

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Your Vote Counts! CHECKPOINT THERAPEUTICS, INC. 2021 Annual Meeting Vote by June 8, 2021 11:59 PM ET 2 GANSEVOORT STREET, 9TH FLOOR NEW YORK, NY 10014 D48382-P51717 You invested in CHECKPOINT THERAPEUTICS, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the stockholder meeting to be held on June 9, 2021. Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 26, 2021. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit www.ProxyVote.com Control # Smartphone users Point your camera here and vote without entering a control number Virtually at: Vote Virtually at the Meeting* June 9, 2021 10:00 AM ET www.virtualshareholdermeeting.com/CKPT2021 *Please check the meeting materials for any special requirements for meeting attendance. V1

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Voting Items Election of Directors Nominees: Michael S. Weiss Christian Bechon Scott Boilen Neil Herskowitz James F. Oliviero Lindsay A. Rosenwald, M.D. Barry Salzman Board Recommends For The ratification of appointment of BDO USA, LLP as independent registered public accounting firm for the year ending December 31, 2021. The approval of an amendment to our Amended and Restated Certificate of Incorporation to increase our authorized shares of common stock by 40,000,000 shares from 95,000,000 to 135,000,000. NOTE: Such other business as may properly come before the meeting or any adjournment thereof. For For Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Sign up for E-delivery”. D48383-P51717