INSMED COO sells 5,837 shares for tax withholding

INSMED Inc Chief Operating Officer Roger Adsett reported a small share sale primarily tied to taxes on equity compensation.

Rhea-AI Filing Summary

INSMED Inc Chief Operating Officer Roger Adsett reported a small share sale primarily tied to taxes on equity compensation. He sold 5,837 shares of common stock at an average price of $116.18 per share. A footnote explains the shares were sold to satisfy tax withholding obligations upon the vesting of Restricted Stock Units and to cover related broker fees, rather than as a discretionary portfolio move. After the transaction, he directly holds 100,973 shares of INSMED common stock.

Insider Trade Summary

Net Seller: 5,837 shares

Net Sell 1 txn

Insider Adsett Roger

Role Chief Operating Officer

Sold 5,837 shs ($678K)

Type	Security	Shares	Price	Value
Sale	Common Stock	5,837	$116.18	$678K

Holdings After Transaction: Common Stock — 100,973 shares (Direct)

Footnotes (1)

1. F1. Shares sold to satisfy tax withholding obligations upon the vesting of Restricted Stock Units and to cover related broker fees.

Key Figures

Shares sold: 5,837 shares Sale price per share: $116.18 per share Shares held after transaction: 100,973 shares

3 metrics

Shares sold 5,837 shares Common Stock, transaction on 2026-05-13

Sale price per share $116.18 per share Average price for 5,837 shares sold

Shares held after transaction 100,973 shares Directly owned common stock following sale

Key Terms

Restricted Stock Units, tax withholding obligations, Common Stock

3 terms

Restricted Stock Units financial

"upon the vesting of Restricted Stock Units and to cover related broker fees"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding obligations financial

"Shares sold to satisfy tax withholding obligations upon the vesting of Restricted Stock Units"

Common Stock financial

"security_title": "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

FAQ

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

What did INSMED (INSM) executive Roger Adsett report in this Form 4?

Roger Adsett reported selling 5,837 shares of INSMED common stock. The sale was linked to tax withholding on vesting Restricted Stock Units and broker fees, and he continues to directly hold 100,973 shares after the transaction.

How many INSMED (INSM) shares did Roger Adsett sell and at what price?

Roger Adsett sold 5,837 shares of INSMED common stock at an average price of $116.18 per share. The sale was described as satisfying tax withholding obligations and related broker fees following the vesting of Restricted Stock Units.

How many INSMED (INSM) shares does Roger Adsett own after this Form 4 transaction?

Following the reported sale, Roger Adsett directly holds 100,973 shares of INSMED common stock. This remaining position provides context that the 5,837 shares sold represent a relatively small portion of his overall direct holdings.

Was Roger Adsett’s INSMED (INSM) share sale a discretionary open-market sale?

The filing labels the transaction as an open-market sale, but a footnote explains the 5,837 shares were sold to satisfy tax withholding obligations upon Restricted Stock Unit vesting and to cover broker fees, indicating a primarily tax-driven, non-discretionary transaction.

What role does Roger Adsett hold at INSMED (INSM)?

Roger Adsett is INSMED’s Chief Operating Officer. His Form 4 filing reflects activity in his personal INSMED common stock holdings, including a tax-related sale of 5,837 shares while retaining 100,973 shares directly afterward.

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

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Accepted by SEC EDGAR 05/15/2026 - 04:07 PM EDT 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^*

Adsett Roger

(Last) (First) (Middle)

700 US HIGHWAY 202/206

(Street)

BRIDGEWATER NEW JERSEY 08807

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
INSMED Inc [ INSM ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/13/2026

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	05/13/2026		S(1)		5,837	D	$116.18	100,973	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. Shares sold to satisfy tax withholding obligations upon the vesting of Restricted Stock Units and to cover related broker fees.

Remarks:

	/s/ Roger Adsett, by Michael A. Smith as Attorney-in-fact	05/15/2026
	** 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)