Insider Transaction Report for Casey M. Tansey

This SEC filing details a transaction by Casey M. Tansey, a director and 10% owner of SHOULDER INNOVATIONS, INC. On October 5, 2026, Tansey acquired 733 shares of Common Stock through the settlement of restricted stock units (RSUs) that were awarded in lieu of cash retainer fees and were fully vested. These RSUs represent a contingent right to one share of Common Stock each and have no expiration date, with the actual receipt of shares deferred until Tansey’s departure from the Board of Directors. The acquisition price was $19.60 per share, resulting in a post-transaction share count of 53,445. The filing also discloses Tansey's indirect ownership of significant share blocks held through various U.S. Venture Partners entities, including 1,686,403 shares held by U.S. Venture Partners XII, L.P., 85,586 shares by U.S. Venture Partners XII-A, L.P., and 921,130 shares by U.S. Venture Partners Select Fund I, L.P. Footnotes clarify that Casey M. Tansey, as managing partner of the general partners of these entities, may be deemed to share voting and dispositive power over these holdings, although beneficial ownership is disclaimed except to the extent of pecuniary interest.