X0609 4 2026-09-14 0 0001699350 SHOULDER INNOVATIONS, INC. SI 0002070664 Ball Robert Joseph false C/O SHOULDER INNOVATIONS, INC. 1535 STEELE AVENUE SW, SUITE B GRAND RAPIDS MI 49507 1 1 0 0 CEO & Executive Chairman 0 Common Stock 2026-09-14 4 M 0 89233 2.0988 A 390999 D Common Stock 2026-09-14 4 S 0 10175 18.4478 D 380824 D Stock Option 2.0988 2026-09-14 4 M 0 89233 0 D 2030-12-16 Common Stock 89233 92143 D Includes 1,748 shares of Common Stock acquired on June 30, 2026 pursuant to the Issuer's 2025 Employee Stock Purchase Plan. The price reported in Column 4 is a weighted average sale price. The shares of Common Stock were sold in multiple transactions at prices ranging from $18.22 to $18.63, inclusive. The Reporting Person undertakes to provide upon request by the staff of the Securities & Exchange Commission, the Issuer or any security holder of the Issuer, full information regarding the number of shares of Common Stock sold at each separate price within the range set forth herein. The shares of Common Stock were sold solely to cover the exercise price in connection with the exercise of the stock option. The stock option is fully vested and currently exercisable. /s/ Jeffrey Points, as Attorney-in-Fact 2026-09-14