Kevin K. Sidow - 01 Aug 2025 Form 4 Insider Report for SHOULDER INNOVATIONS, INC. (SI)

Role: Director
Signature: Jeffrey Points, as Attorney-in-Fact
Issuer symbol: SI
Transactions as of: 01 Aug 2025
Net transactions value: $0
Form type: 4
Filing time: 05 Aug 2025, 16:05:12 UTC
Previous filing: 30 Jul 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Sidow Kevin K.	Director	C/O SHOULDER INNOVATIONS, INC., 1535 STEELE AVENUE SW, SUITE B, GRAND RAPIDS	Jeffrey Points, as Attorney-in-Fact	05 Aug 2025	0002072468

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SI	Common Stock	Conversion of derivative security		+12,344			12,344	01 Aug 2025	Direct	F1
transaction	SI	Common Stock	Award	$0	+7,666	+62%	$0.000000	20,010	01 Aug 2025	Direct	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	SI	Series D Convertible Preferred Stock	Conversion of derivative security		-235,524	-100%		0	01 Aug 2025	Common Stock	12,344		Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	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.
F2	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 2026 or August 1, 2026. Each RSU represents a contingent right to receive one share of the Issuer's Common Stock and has no expiration date.