Vanguard (NASDAQ: INSM) reports 11.5M Insmed shares, 5.34% stake

Rhea-AI Filing Summary

Insmed Inc reported a Schedule 13G filing showing Vanguard Capital Management beneficially owned 11,514,893 shares of Common Stock, representing 5.34% of the class as of 03/31/2026. The filer reports 1,872,762 shares of sole voting power and sole dispositive power over 11,514,893 shares.

Insights

Institutional Ownership Analyst

Vanguard holds a passive >5% stake in Insmed, disclosed via Schedule 13G.

Schedule 13G filings identify institutional investors with passive ownership positions. The excerpt shows 11,514,893 shares and a 5.34% stake as of 03/31/2026, with voting and dispositive power details reported.

Filing language indicates the holdings include assets managed across Vanguard affiliates; cash‑flow treatment and trading intent are not stated in the excerpt.

Corporate Governance Specialist

Voting and dispositive power are explicitly itemized, clarifying control lines.

The filing lists 1,872,762 shares of sole voting power and 11,514,893 shares of sole dispositive power. Those labels define who may direct votes and dispositions for the reported shares.

Stakeholders may watch subsequent filings for any change in ownership category or percentage; timing and intent are not provided in the excerpt.

Key Figures

Shares beneficially owned: 11,514,893 shares Percent of class: 5.34% Sole voting power: 1,872,762 shares +3 more

6 metrics

Shares beneficially owned 11,514,893 shares as of 03/31/2026 (Schedule 13G)

Percent of class 5.34% percentage of common stock as reported

Sole voting power 1,872,762 shares shares Vanguard has sole power to vote

Sole dispositive power 11,514,893 shares shares Vanguard has sole power to dispose

CUSIP 457669307 Insmed Common Stock identifier in filing

Signature date 04/30/2026 date the Schedule 13G was signed

Key Terms

Schedule 13G, beneficially owned, sole dispositive power, sole voting power

4 terms

Schedule 13G regulatory

"Insmed Inc ... Item 2. | (a) | Name of person filing: Vanguard Capital Management"

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.

beneficially owned financial

"Amount beneficially owned: 11514893"

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 dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 11514893"

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.

sole voting power regulatory

"Sole power to vote or to direct the vote: 1872762"

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.

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

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Accepted by SEC EDGAR 04/30/2026 - 10:37 AM Learn about SEC filing dates

FAQ

What stake does Vanguard report in Insmed (INSM)?

Vanguard Capital Management reports beneficial ownership of 11,514,893 shares, equal to 5.34% of Insmed's common stock as of 03/31/2026. The filing lists voting and dispositive power breakdowns for those shares.

Does the Schedule 13G indicate Vanguard controls voting of Insmed shares?

The filing reports 1,872,762 shares of sole voting power held by Vanguard and 11,514,893 shares of sole dispositive power as of 03/31/2026. It specifies which affiliates are included in the reporting unit.

Is the Vanguard filing an active trading disclosure or passive ownership?

This is a Schedule 13G disclosure used by institutional investors reporting passive beneficial ownership. The excerpt does not state trading intent, plans, or whether holdings were acquired recently.

Who signed the Insmed Schedule 13G on behalf of Vanguard?

The filing is signed by Ashley Grim, listed as Head of Global Fund Administration, with the signature dated 04/30/2026 for the Schedule 13G covering the period ending 03/31/2026.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Insmed Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

457669307

(CUSIP Number)

03/31/2026

(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): 457669307

1

Names of Reporting Persons

Vanguard Capital Management

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

PENNSYLVANIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 1,872,762.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 11,514,893.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

11,514,893.00

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)

5.34 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by Vanguard Capital Management LLC and the following affiliates of Vanguard Capital Management LLC or business divisions of such affiliates: Vanguard Asset Management Limited, Vanguard Fiduciary Trust Company, Vanguard Global Advisers, LLC and Vanguard Investments Australia Ltd. This Schedule 13G includes securities held by Vanguard funds, or sleeves thereof, over which Vanguard Capital Management LLC exercises dispositive power, in addition to securities held by clients over which the affiliates or business divisions of such affiliates indicated above exercise dispositive and/or voting power. This Schedule 13G does not include securities, if any, beneficially owned by other subsidiaries or affiliates of Vanguard Capital Management LLC, or business divisions of such subsidiaries, whose ownership of securities is disaggregated from that of the reporting business unit in accordance with such release.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Insmed Inc
(b)	Address of issuer's principal executive offices: 700 US Highway 202/206, Bridgewater, NJ, 08807
Item 2.
(a)	Name of person filing: Vanguard Capital Management
(b)	Address or principal business office or, if none, residence: 100 Vanguard Blvd,, Malvern, PA, 19355
(c)	Citizenship: PA
(d)	Title of class of securities: Common Stock
(e)	CUSIP Number(s): 457669307
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: 11514893
(b)	Percent of class: 5.34 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1872762
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 11514893
	(iv) Shared power to dispose or to direct the disposition of: 0
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. Vanguard Capital Management, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities reported herein.No one other person's interest in the securities reported herein is more than 5%.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
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.

Vanguard Capital Management

Signature:	Ashley Grim
Name/Title:	Head of Global Fund Administration
Date:	04/30/2026