X0508 4 2026-02-09 0 0001727196 Scholar Rock Holding Corp SRRK 0001922346 Parlavecchio Caryn 301 BINNEY STREET CAMBRIDGE MA 02142 0 1 0 0 Chief Human Resources Officer 0 Common Stock 2026-02-09 4 A 0 29258 0.00 A 178122 D Represents restricted stock units ("RSUs") subject to time-based vesting conditions. Each RSU represents the contingent right to receive, upon vesting of the RSU, one share of the Issuer's common stock. The shares subject to this RSU vest in four annual installments over four years, with the first annual installment to vest on January 15, 2027 and each additional installment to vest annually thereafter; provided the reporting person continues to have a service relationship with the Issuer on each such vesting date. Consists of 78,283 shares of common stock and 99,839 RSUs. /s/ Junlin Ho, Attorney-in-Fact for Caryn Parlavecchio 2026-02-11