FMR LLC reports 17.7% beneficial ownership in Shoulder Innovations Inc (SI)

Rhea-AI Filing Summary

FMR LLC and related reporting person Abigail P. Johnson report beneficial ownership of common stock of Shoulder Innovations Inc. FMR LLC reports beneficial ownership of 3,673,960 shares of common stock, representing 17.7% of the class, with 3,655,660 shares subject to sole voting power and 3,673,960 shares subject to sole dispositive power.

Abigail P. Johnson reports beneficial ownership of 3,673,960 shares with sole dispositive power but no sole or shared voting power, reflecting her position as a control person of FMR LLC. One or more other persons have rights to receive dividends or sale proceeds from these shares, but no such person holds more than 5% of the total outstanding common stock.

Key Figures

Shares beneficially owned (FMR LLC): 3,673,960 shares Percent of class: 17.7% Sole Voting Power (FMR LLC): 3,655,660 shares +3 more

6 metrics

Shares beneficially owned (FMR LLC) 3,673,960 shares Amount beneficially owned under Item 4(a)

Percent of class 17.7% Percent of Shoulder Innovations common stock class reported under Item 4(b)

Sole Voting Power (FMR LLC) 3,655,660 shares Shares with sole power to vote or direct the vote

Sole Dispositive Power (FMR LLC) 3,673,960 shares Shares with sole power to dispose or direct disposition

Sole Dispositive Power (Abigail P. Johnson) 3,673,960 shares Shares over which Abigail P. Johnson has sole dispositive power

CUSIP 82537J108 CUSIP number for Shoulder Innovations Inc common stock

Key Terms

beneficially owned, Sole Voting Power, Sole Dispositive Power, Schedule 13G, +1 more

5 terms

beneficially owned financial

"Amount beneficially owned: 3673960.00"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Sole Voting Power financial

"5 | Sole Voting Power 3,655,660.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

Sole Dispositive Power financial

"7 | Sole Dispositive Power 3,673,960.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

Schedule 13G regulatory

"Please see Exhibit 99 for 13d-1(k) (1) agreement."

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

parent holding company financial

"Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company"

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

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Available on EDGAR 08/06/2026 - 10:42 AM Accepted by SEC EDGAR 08/06/2026 - 10:41 AM Learn about SEC filing dates

FAQ

How much of Shoulder Innovations Inc (SI) stock does FMR LLC report owning?

FMR LLC reports beneficial ownership of 3,673,960 shares of Shoulder Innovations Inc common stock, representing 17.7% of the outstanding class, with sole dispositive power over all these shares and sole voting power over 3,655,660 shares.

What percentage of Shoulder Innovations Inc (SI) does Abigail P. Johnson beneficially own?

Abigail P. Johnson is reported as beneficially owning 3,673,960 shares of Shoulder Innovations Inc, equal to 17.7% of the common stock. She has sole dispositive power over these shares but no sole or shared voting power reported.

What voting and dispositive powers does FMR LLC report over Shoulder Innovations (SI) shares?

FMR LLC reports 3,655,660 shares with sole voting power and 3,673,960 shares with sole dispositive power in Shoulder Innovations Inc. It reports zero shared voting power and zero shared dispositive power over the company’s common stock.

Are there other beneficiaries of the Shoulder Innovations Inc (SI) shares held by FMR LLC?

Yes. One or more other persons have the right to receive dividends or sale proceeds from the Shoulder Innovations Inc common stock. However, no single such person has an interest in more than 5% of the total outstanding common stock.

What is the class and CUSIP of the securities covered in this Schedule 13G/A for SI?

The securities are common stock of Shoulder Innovations Inc with CUSIP 82537J108. The filing lists this class under Item 2(d) and provides the CUSIP under Item 2(e) as part of the ownership disclosure.

Who signed the Schedule 13G/A related to Shoulder Innovations Inc (SI)?

The filing is signed by Stephanie J. Brown, acting under powers of attorney on behalf of both FMR LLC and Abigail P. Johnson. The signatures are dated 08/05/2026, referencing prior power-of-attorney exhibits incorporated by reference.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

SHOULDER INNOVATIONS INC

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

82537J108

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 82537J108

1

Names of Reporting Persons

FMR LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 3,655,660.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 3,673,960.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,673,960.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

17.7 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s): 82537J108

1

Names of Reporting Persons

Abigail P. Johnson

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 3,673,960.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,673,960.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

17.7 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: SHOULDER INNOVATIONS INC
(b)	Address of issuer's principal executive offices: 1535 STEELE AVENUE SW,SUITE B,GRAND RAPIDS,MI,USA,49507
Item 2.
(a)	Name of person filing: FMR LLC
(b)	Address or principal business office or, if none, residence: 245 Summer Street, Boston, Massachusetts 02210
(c)	Citizenship: Not applicable
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP No.: 82537J108
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 3673960.00
(b)	Percent of class: 17.7 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Please see the responses to Items 5 and 6 on the cover page.
	(ii) Shared power to vote or to direct the vote: 0.00
	(iii) Sole power to dispose or to direct the disposition of: 3673960.00
	(iv) Shared power to dispose or to direct the disposition of: 0.00
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. One or more other persons are known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the COMMON STOCK of SHOULDER INNOVATIONS INC. No one other person's interest in the COMMON STOCK of SHOULDER INNOVATIONS INC is more than five percent of the total outstanding COMMON STOCK.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See attached Exhibit 99.
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

FMR LLC

Signature:	Stephanie J. Brown
Name/Title:	Duly authorized under Power of Attorney effective as of January 3, 2023, by and on behalf of FMR LLC and its direct and indirect subsidiaries*
Date:	08/05/2026

Abigail P. Johnson

Signature:	Stephanie J. Brown
Name/Title:	Duly authorized under Power of Attorney effective as of January 26, 2023, by and on behalf of Abigail P. Johnson**
Date:	08/05/2026

Comments accompanying signature: * This power of attorney is incorporated herein by reference to Exhibit 24 to the Schedule 13G filed by FMR LLC on January 10, 2023, accession number: 0000315066-23-000003. ** This power of attorney is incorporated herein by reference to Exhibit 24 to the Schedule 13G filed by FMR LLC on January 31, 2023, accession number: 0000315066-23-000038.

Exhibit Information

Please see Exhibit 99 for 13d-1(k) (1) agreement.