Shoulder Innovations director granted 5,046 RSUs

Sidow Kevin K. reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Sidow Kevin K. reported acquisition or exercise transactions in this Form 4 filing.

SHOULDER INNOVATIONS, INC. director Kevin K. Sidow received an equity grant of 5,046 restricted stock units (RSUs), each representing one future share of common stock at no purchase price. These RSUs vest on the earlier of the 2027 annual stockholder meeting or June 26, 2027.

Sidow has voluntarily elected to defer receipt of the underlying common shares until he leaves the Board of Directors. After this award, his reported direct holdings total 25,056 shares or share-equivalent units.

Insider Trade Summary

Grant/Award: 5,046 shares

Grant/Award 1 txn

Insider Sidow Kevin K.

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	5,046	$0.00	$0.00

Holdings After Transaction: Common Stock — 25,056 shares (Direct)

Footnotes (1)

1. F1. 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.

Key Figures

RSUs granted: 5,046 units Grant price: $0.00 per share Holdings after award: 25,056 shares +1 more

4 metrics

RSUs granted 5,046 units Restricted stock unit award to director on June 26, 2026

Grant price $0.00 per share Equity compensation, not a market purchase

Holdings after award 25,056 shares Total direct position reported following RSU grant

RSU vesting date Earlier of 2027 annual meeting or June 26, 2027 Time-based vesting for the RSU award

Key Terms

restricted stock units ("RSUs"), contingent right, Board of Directors

3 terms

restricted stock units ("RSUs") financial

"Represents an award of restricted stock units ("RSUs")."

Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.

contingent right financial

"Each RSU represents a contingent right to receive one share of the Issuer's Common Stock"

Board of Directors financial

"until the Reporting Person's departure from the Board of Directors."

The Board of Directors is a group of people chosen by a company's owners to help make big decisions and oversee how the company is run. They act like a team of advisors or managers, making sure the company stays on track and meets its goals. Their choices can influence the company's success and how it grows.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did SHOULDER INNOVATIONS (SI) report for Kevin K. Sidow?

Kevin K. Sidow received a grant of 5,046 restricted stock units. Each RSU entitles him to one share of SHOULDER INNOVATIONS common stock, reported at a grant price of $0.00 per share as part of his director compensation.

When do Kevin K. Sidow’s 5,046 RSUs at SHOULDER INNOVATIONS (SI) vest?

The 5,046 RSUs vest on the earlier of the company’s 2027 annual stockholder meeting or June 26, 2027. This time-based vesting schedule aligns the director’s compensation with ongoing board service over the coming year.

How many SHOULDER INNOVATIONS (SI) shares does Kevin K. Sidow hold after this Form 4?

Following the RSU award, Kevin K. Sidow’s reported direct holdings total 25,056 shares or share-equivalent units. This figure reflects his position after the 5,046 restricted stock units were granted as additional equity compensation.

Did Kevin K. Sidow pay for the 5,046 RSUs from SHOULDER INNOVATIONS (SI)?

No, the RSUs were granted at a reported price of $0.00 per unit. They represent stock-based compensation rather than a market purchase, with each RSU convertible into one share of common stock upon settlement.

When will Kevin K. Sidow receive the common stock from his SHOULDER INNOVATIONS (SI) RSUs?

Sidow voluntarily elected to defer receipt of the common stock until he departs the Board of Directors. The RSUs still vest in 2027, but share delivery will occur upon his board departure according to his deferral election.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/29/2026 - 05:10 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Sidow Kevin K.

(Last) (First) (Middle)

C/O SHOULDER INNOVATIONS, INC.

1535 STEELE AVENUE SW, SUITE B

(Street)

GRAND RAPIDS MICHIGAN 49507

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
SHOULDER INNOVATIONS, INC. [ SI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/26/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	06/26/2026		A		5,046(1)	A	$0	25,056	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 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.

Remarks:

	/s/ Jeffrey Points, as Attorney-in-Fact	06/29/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)