Tax withholding stock sales by Insmed (NASDAQ: INSM) COO Roger Adsett

Rhea-AI Filing Summary

Insmed Inc. Chief Operating Officer Roger Adsett reported three sales of Insmed common stock in early January. On January 6, 2026, he sold 1,429 shares at $173.33 per share. On January 7, 2026, he sold 802 shares at $175.07 per share, and on January 8, 2026, he sold 2,059 shares at $174.17 per share.

After these transactions, Adsett directly held 107,601 Insmed shares. A footnote explains that the shares were sold to satisfy tax withholding obligations arising from the vesting of restricted stock units and to cover related broker fees, indicating these were primarily tax-related transactions rather than discretionary sales.

Insider Trade Summary

Net Seller: 4,290 shares ($746,711)

Net Sell 3 txns

Insider Adsett Roger

Role Chief Operating Officer

Sold 4,290 shs ($747K)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,059	$174.17	$359K
Sale	Common Stock	802	$175.07	$140K
Sale	Common Stock	1,429	$173.33	$248K

Holdings After Transaction: Common Stock — 107,601 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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)
01/06/2026

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	01/06/2026		S(1)		1,429	D	$173.33	110,462	D
Common Stock	01/07/2026		S(1)		802	D	$175.07	109,660	D
Common Stock	01/08/2026		S(1)		2,059	D	$174.17	107,601	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	01/08/2026
	** 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 did Insmed (INSM) COO Roger Adsett report in this Form 4?

The filing reports that Roger Adsett, Chief Operating Officer of Insmed Inc., sold Insmed common stock on three dates in January 2026 and discloses his updated direct share ownership.

How many Insmed (INSM) shares did Roger Adsett sell and at what prices?

Adsett sold 1,429 shares at $173.33 on January 6, 2026, 802 shares at $175.07 on January 7, 2026, and 2,059 shares at $174.17 on January 8, 2026.

How many Insmed (INSM) shares does Roger Adsett own after these transactions?

Following the reported sales, Roger Adsett directly beneficially owns 107,601 shares of Insmed common stock.

Why were Roger Adsett’s Insmed (INSM) shares sold according to the Form 4?

A footnote states that the shares were sold to satisfy tax withholding obligations upon the vesting of restricted stock units and to cover related broker fees.

Are the Insmed (INSM) transactions reported as direct or indirect ownership for Roger Adsett?

The transactions are reported as involving direct (D) ownership, meaning the shares sold and remaining are held directly by Roger Adsett rather than through an intermediate entity.

Did this Form 4 report any derivative securities for Insmed (INSM)?

The section for derivative securities, such as options or warrants, is included in the form but contains no reported derivative transactions in this filing.