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Your Vote Counts! SCHOLAR ROCK HOLDING CORPORATION 301 BINNEY STREET 3RD FLOOR CAMBRIDGE, MA 02142 SCHOLAR ROCK HOLDING CORPORATION 2023 Annual Meeting Vote by June 20, 2023 11:59 PM ET You invested in SCHOLAR ROCK HOLDING CORPORATION 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 21, 2023. *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 # V14273-P86991 Get informed before you vote View the Notice of Internet Availability, Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to June 7, 2023. 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. Vote Virtually at the Meeting* June 21, 2023 12:30 PM, Eastern Time Virtually at: www.virtualshareholdermeeting.com/SRRK2023




THIS IS NOT A VOTABLE BALLOT Your vote is important. We encourage you to vote in advance even if you plan to attend the 2023 Annual Meeting online. 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. If shares are held in multiple accounts, please vote on each proxy card you receive to ensure that all of the shares are represented at the 2023 Annual Meeting. Vote at www.ProxyVote.com Voting Items Board Recommends V14274-P86991 Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”. 01) David Hallal 02) Kristina Burow 03) Michael Gilman Ph.D. 1. To elect three Class II Directors, each to serve until the 2026 Annual Meeting of Stockholders and until his/her successor has been duly elected and qualified. Nominees: For For 2. To ratify the appointment of Ernst & Young LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2023. NOTE: Such other business as may properly come before the meeting or any adjournment thereof.