X0609 4 2026-09-21 0 0001727196 Scholar Rock Holding Corp SRRK 0001457477 Hallal David false 301 BINNEY STREET CAMBRIDGE MA 02142 1 1 0 0 Chief Executive Officer 0 Common Stock 2026-09-21 4 G 0 36652 0.00 D 1602382 D Common Stock 36652 I By The Hallal Family Irrevocable Trust - 2021 Common Stock 205000 I By The Hallal Family Irrevocable Trust - 2012 On September 21, 2026, the reporting person transferred 36,652 shares of the Issuer's Common Stock to The Hallal Family Irrevocable Trust-2021 (the "Hallal 2021 Trust") for no consideration. The reporting person and his spouse serve as trustees of the Hallal 2021 Trust. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose. Consists of 161,878 shares of common stock, 315,504 RSUs subject to time-based vesting conditions and 1,125,000 RSUs subject to performance- and time-based vesting conditions. Shares owned by The Hallal Family Irrevocable Trust - 2012 dated November 19, 2012 (the "Hallal 2012 Trust"). The reporting person's spouse serves as a trustee of the Hallal 2012 Trust. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose. /s/ Junlin Ho, Attorney-in-Fact for David Hallal 2026-09-23