INSMED (INSM) COO Roger Adsett sells 791 shares for RSU tax withholding

Rhea-AI Filing Summary

INSMED Inc.'s Chief Operating Officer Roger Adsett reported a routine sale of company stock in connection with equity compensation. On February 3, 2026, he sold 791 shares of common stock at a price of $156.17 per share. A footnote explains that 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 open-market sale. After this transaction, Adsett beneficially owned 106,810 shares of INSMED common stock directly.

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 NJ 08807

(City) (State) (Zip)

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

3. Date of Earliest Transaction (Month/Day/Year)
02/03/2026

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

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

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

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	02/03/2026		S(1)		791	D	$156.17	106,810	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	02/04/2026
	** 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.

FAQ

What insider transaction did INSMED (INSM) report for Roger Adsett?

INSMED reported that Chief Operating Officer Roger Adsett sold 791 shares of common stock. The transaction on February 3, 2026 was linked to tax withholding on vested Restricted Stock Units and related broker fees, rather than a discretionary open-market sale.

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

Roger Adsett sold 791 shares of INSMED common stock at a price of $156.17 per share. The filing notes this sale was made to cover tax withholding obligations and broker fees arising from the vesting of Restricted Stock Units.

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

After the reported transaction, Roger Adsett beneficially owns 106,810 shares of INSMED common stock directly. This figure reflects his holdings following the sale of 791 shares used to satisfy tax withholding obligations on vested Restricted Stock Units.

What is the role of Roger Adsett at INSMED (INSM) according to the Form 4?

According to the Form 4, Roger Adsett serves as INSMED’s Chief Operating Officer. His status is reported as an officer of the company, rather than a director or 10% owner, in connection with the disclosed stock transaction on February 3, 2026.

Why were Roger Adsett’s INSMED (INSM) shares sold according to the filing footnote?

The footnote explains that the 791 shares were sold to satisfy tax withholding obligations tied to the vesting of Restricted Stock Units and to cover related broker fees. This indicates the sale was driven by tax and administrative requirements, not an elective disposal of shares.

Was Roger Adsett’s INSMED (INSM) stock sale a direct transaction?

Yes. The Form 4 indicates the transaction was held as direct ownership, labeled "D" for direct. There is no indication of an intermediary entity or indirect beneficial ownership in the reported 791-share sale linked to RSU-related tax withholding.