Ball Robert Joseph

SEC source: 0002070664-26-000006 · wk-form4_1789431783.xml · derivative · entry 3

Ball Robert Joseph · CIK 0002070664 · Director · CEO & Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 92,143

Underlying: Common Stock · 89,233 shares

Expires 2030-12-16

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: The stock option is fully vested and currently exercisable.

SEC source: 0002070664-26-000006 · wk-form4_1789431783.xml · nonDerivative · entry 2

Ball Robert Joseph · CIK 0002070664 · Director · CEO & Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 380,824

F2 · price: 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.

SEC source: 0002070664-26-000006 · wk-form4_1789431783.xml · nonDerivative · entry 1

Ball Robert Joseph · CIK 0002070664 · Director · CEO & Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 390,999

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes 1,748 shares of Common Stock acquired on June 30, 2026 pursuant to the Issuer's 2025 Employee Stock Purchase Plan.

SEC source: 0002070664-26-000005 · wk-form4_1777581232.xml · derivative · entry 2

Ball Robert Joseph · CIK 0002070664 · Director · CEO & Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 309,756

Underlying: Common Stock · 10,000 shares

Expires 2033-05-17

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: The stock option vested as to one-fourth of the underlying shares on May 17, 2024, and the remaining shares vest in 36 equal increments on the last day of each calendar month thereafter.

SEC source: 0002070664-26-000005 · wk-form4_1777581232.xml · nonDerivative · entry 1

Ball Robert Joseph · CIK 0002070664 · Director · CEO & Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 300,018

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes the following shares received without consideration as in-kind distributions: (i) 4,400 shares from Cultivate MD Capital Fund I, LLC; and (ii) 6,752 shares from Genesis Investment Holdings. In prior reports, the reporting person reported beneficial ownership of 278,866 shares of Shoulder Innovations common stock held directly.

SEC source: 0002070664-26-000004 · wk-form4_1773783067.xml · nonDerivative · entry 1

Ball Robert Joseph · CIK 0002070664 · Director · CEO & Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 278,866

F1 · price: The price reported in Column 4 is a weighted average purchase price. The shares of Common Stock were purchased in multiple transactions at prices ranging from $14.80 to $15.50, 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 purchased at each separate price within the range set forth herein.

SEC source: 0002070664-26-000003 · wk-form4_1770758663.xml · derivative · entry 4

Ball Robert Joseph · CIK 0002070664 · Director · CEO & Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 181,376

Underlying: Common Stock · 2,062 shares

Expires 2030-12-16

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: The stock option is fully vested and currently exercisable.

SEC source: 0002070664-26-000003 · wk-form4_1770758663.xml · derivative · entry 3

Ball Robert Joseph · CIK 0002070664 · Director · CEO & Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 319,756

Underlying: Common Stock · 10,000 shares

Expires 2033-05-17

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: The stock option vested as to one-fourth of the underlying shares on May 17, 2024, and the remaining shares vest in 36 equal increments on the last day of each calendar month thereafter.

SEC source: 0002070664-26-000003 · wk-form4_1770758663.xml · nonDerivative · entry 2

Ball Robert Joseph · CIK 0002070664 · Director · CEO & Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 276,666

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0002070664-26-000003 · wk-form4_1770758663.xml · nonDerivative · entry 1

Ball Robert Joseph · CIK 0002070664 · Director · CEO & Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 274,604

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Includes the following shares received without consideration as in-kind distributions: (i) 110,331 shares from Genesis Investment Holdings; (ii) 7,859 shares from cultivate(MD) Capital Accelerator Fund, L.P.; (iii) 6,948 shares from Cultivate MD Capital Fund I, LLC; and (iv) 19,348 shares from Cultivate MD Capital Fund II, LP. In prior reports, the reporting person reported beneficial ownership of 120,118 shares of Shoulder Innovations common stock held directly.

SEC source: 0002070664-26-000002 · wk-form4_1770154525.xml · derivative · entry 1

Ball Robert Joseph · CIK 0002070664 · Director · CEO & Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 265,351

Underlying: Common Stock · 265,351 shares

Expires 2033-01-30

F1 · derivative.exercise_date: The stock option vests as to one-fourth of the underlying shares on March 1st each year, beginning on March 1, 2027.

SEC source: 0002070664-26-000001 · wk-form4_1767909450.xml · nonDerivative · entry 1

Ball Robert Joseph · CIK 0002070664 · Director · CEO & Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 120,118

F1 · kind: The Reporting Person is voluntarily reporting the acquisition of shares under the Issuer's 2025 Employee Stock Purchase Plan ("ESPP") .

F2 · price: In accordance with the ESPP, these shares were purchased at a price equal to 85% of the closing price of the Issuer's common stock on December 31, 2025.

SEC source: 0001628280-25-057067 · wk-form4_1765835502.xml · nonDerivative · entry 2

Ball Robert Joseph · CIK 0002070664 · Director · CEO & Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 118,457

F2 · price: The price reported in Column 4 is a weighted average purchase price. The shares of Common Stock were purchased in multiple transactions at prices ranging from $14.60 to $15.26, 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 purchased at each separate price within the range set forth herein.

SEC source: 0001628280-25-057067 · wk-form4_1765835502.xml · nonDerivative · entry 1

Ball Robert Joseph · CIK 0002070664 · Director · CEO & Executive Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 114,557

F1 · price: The price reported in Column 4 is a weighted average purchase price. The shares of Common Stock were purchased in multiple transactions at prices ranging from $14.56 to $15.16, 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 purchased at each separate price within the range set forth herein.

SEC source: 0001493152-25-013475 · ownership.xml · nonDerivative · entry 2

Ball Robert Joseph · CIK 0002070664 · Director · CEO & EXECUTIVE CHAIRMAN

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,259

F2 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $14.9196 to $15.815. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

SEC source: 0001493152-25-013475 · ownership.xml · nonDerivative · entry 1

Ball Robert Joseph · CIK 0002070664 · Director · CEO & EXECUTIVE CHAIRMAN

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 105,259

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $14.8096 to $15.00. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

SEC source: 0001641172-25-022242 · ownership.xml · derivative · entry 6

Ball Robert Joseph · CIK 0002070664 · Director · CEO & EXECUTIVE CHAIRMAN

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 7,676 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

F1 · price: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

F1 · derivative.exercise_date: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

F1 · derivative.expiration_date: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

SEC source: 0001641172-25-022242 · ownership.xml · derivative · entry 5

Ball Robert Joseph · CIK 0002070664 · Director · CEO & EXECUTIVE CHAIRMAN

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 37,032 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

F1 · price: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

F1 · derivative.exercise_date: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

F1 · derivative.expiration_date: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

SEC source: 0001641172-25-022242 · ownership.xml · derivative · entry 4

Ball Robert Joseph · CIK 0002070664 · Director · CEO & EXECUTIVE CHAIRMAN

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 20,301 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

F1 · price: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

F1 · derivative.exercise_date: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

F1 · derivative.expiration_date: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

SEC source: 0001641172-25-022242 · ownership.xml · derivative · entry 3

Ball Robert Joseph · CIK 0002070664 · Director · CEO & EXECUTIVE CHAIRMAN

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 9,228 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

F1 · price: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

F1 · derivative.exercise_date: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

F1 · derivative.expiration_date: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

SEC source: 0001641172-25-022242 · ownership.xml · derivative · entry 2

Ball Robert Joseph · CIK 0002070664 · Director · CEO & EXECUTIVE CHAIRMAN

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 11,651 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

F1 · price: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

F1 · derivative.exercise_date: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

F1 · derivative.expiration_date: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.

SEC source: 0001641172-25-022242 · ownership.xml · nonDerivative · entry 1

Ball Robert Joseph · CIK 0002070664 · Director · CEO & EXECUTIVE CHAIRMAN

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 103,259

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Immediately prior to the closing of the Issuer's initial public offering, the shares of preferred stock of the Issuer automatically converted into shares of Common Stock on a one-for-0.052410901 basis.