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Your Vote Counts! BLACK DIAMOND THERAPEUTICS, INC. Virtually at: www.virtualshareholdermeeting.com/BDTX2023 *Please check the meeting materials for any special requirements for meeting attendance. Smartphone users Point your camera here and vote without entering a control number V1.1 For complete information and to vote, visit www.ProxyVote.com Control # V00902-P87840 2023 Annual Meeting of Stockholders To be Held Online on May 16, 2023 Vote by May 15, 2023 11:59 PM EDT Important notice regarding the availability of proxy materials for the Annual Meeting to be held on May 16, 2023. You invested in BLACK DIAMOND THERAPEUTICS, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. Vote Virtually at the Annual Meeting* May 16, 2023 9:00 AM EDT Get informed before you vote View the Notice, Proxy Statement and 2022 Annual Report online at www.ProxyVote.com OR you can receive a free paper or email copy of the material(s) by requesting prior to May 2, 2023. If you would like to request a copy of the material(s) for this and/or future annual meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 (toll-free from the U.S., U.S. territories and Canada) 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. BLACK DIAMOND THERAPEUTICS, INC. ONE MAIN STREET, 14TH FLOOR CAMBRIDGE, MA 02142


Vote at www.ProxyVote.com Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Sign up for E-delivery”. Voting Items Board Recommends V00903-P87840 THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming Annual Meeting. Please follow the instructions on the reverse side to vote on these important matters. 1. Election of Class III Directors Nominees: 2. To ratify the appointment of PricewaterhouseCoopers LLP as Black Diamond Therapeutics, Inc.’s independent registered accounting firm for the fiscal year ending December 31, 2023. NOTE: The Board of Directors will consider and act upon any other business that may properly come before the upcoming stockholder meeting or any adjournment or postponement thereof. For For For For 1c. Kapil Dhingra 1a. David M. Epstein 1b. Wendy L. Dixon