X0609 4 2026-06-26 0 0001699350 SHOULDER INNOVATIONS, INC. SI 0001215243 BUCKMAN PAUL false C/O SHOULDER INNOVATIONS, INC. 1535 STEELE AVENUE SW, SUITE B GRAND RAPIDS MI 49507 1 0 0 0 0 Common Stock 2026-06-26 4 A 0 5046 0 A 63750 D Represents an award of restricted stock units ("RSUs"). The RSUs will vest on the earlier of the date of the annual meeting of stockholders to be held in 2027 or June 26, 2027. Each RSU represents a contingent right to receive one share of the Issuer's Common Stock and has no expiration date. The Reporting Person voluntarily elected to defer receipt of the Common Stock issuable upon settlement of the RSUs until the Reporting Person's departure from the Board of Directors. /s/ Jeffrey Points, as Attorney-in-Fact 2026-06-29