INSMED (INSM) COO sells 2,370 shares to cover RSU tax withholding

Rhea-AI Filing Summary

INSMED Inc Chief Operating Officer Roger Adsett reported a sale of 2,370 shares of common stock. The shares were sold at an average price of $102.27 per share to satisfy tax withholding obligations related to the vesting of Restricted Stock Units and to cover associated broker fees. After this transaction, Adsett directly holds 98,603 shares of INSMED common stock, indicating this was a routine, tax-driven disposition rather than a discretionary reduction in his equity stake.

Insider Trade Summary

Net Seller: 2,370 shares ($242,380)

Net Sell 1 txn

Insider Adsett Roger

Role Chief Operating Officer

Sold 2,370 shs ($242K)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,370	$102.27	$242K

Holdings After Transaction: Common Stock — 98,603 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares sold: 2,370 shares Sale price: $102.27 per share Shares held after: 98,603 shares +1 more

4 metrics

Shares sold 2,370 shares Common Stock sold on 2026-06-03

Sale price $102.27 per share Average sale price for reported transaction

Shares held after 98,603 shares Direct holdings following transaction

Net shares sold 2,370 shares Net-sell direction per transaction summary

Key Terms

Restricted Stock Units, tax withholding obligations, open-market sale, Form 4

4 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"

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Form 4 regulatory

"INSIDER FILING DATA (Form 4)"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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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 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)
06/03/2026

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	06/03/2026		S(1)		2,370	D	$102.27	98,603	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	06/05/2026
	** 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)

FAQ

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

INSMED Inc reported that COO Roger Adsett sold 2,370 shares of common stock. The sale was tied to tax withholding on vested Restricted Stock Units and broker fees, rather than a discretionary reduction in his overall equity position.

Why did INSM Chief Operating Officer Roger Adsett sell 2,370 shares?

The shares were sold to satisfy tax withholding obligations when Restricted Stock Units vested and to cover related broker fees. This type of transaction is typically mechanical and driven by tax requirements instead of an intentional change in investment exposure.

At what price were Roger Adsett’s INSM shares sold in this Form 4 filing?

The 2,370 INSM shares were sold at an average price of $102.27 each. This price reflects the execution level for the tax-related sale connected to the vesting of Restricted Stock Units and payment of associated broker fees.

How many INSM shares does Roger Adsett hold after this reported sale?

After the transaction, Roger Adsett directly holds 98,603 INSM shares. This remaining stake shows that the 2,370-share disposition was small relative to his total holdings and was undertaken for tax withholding and fee coverage purposes.

Is Roger Adsett’s INSM stock sale considered an open-market transaction?

The Form 4 lists the trade as an open-market sale, but the footnote explains it was executed to cover tax withholding on vested Restricted Stock Units and related broker fees, making it a routine, tax-driven transaction rather than a purely discretionary sale.