William Lewis - 06 Jan 2026 Form 4 Insider Report for INSMED Inc (INSM)

Role: Chair and CEO, Director
Signature: /s/ William Lewis, by Michael A. Smith as Attorney-in-fact
Issuer symbol: INSM
Transactions as of: 06 Jan 2026
Net transactions value: -$1,683,950
Form type: 4
Filing time: 08 Jan 2026, 17:20:18 UTC
Previous filing: 06 Jan 2026
Next filing: 09 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Lewis William	Chair and CEO, Director	700 US HIGHWAY 202/206, BRIDGEWATER	/s/ William Lewis, by Michael A. Smith as Attorney-in-fact	08 Jan 2026	0001402051

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	INSM	Common Stock	Sale	$709,960	-4,096	-1.3%	$173.33	320,987	06 Jan 2026	Direct	F1
transaction	INSM	Common Stock	Sale	$412,640	-2,357	-0.73%	$175.07	318,630	07 Jan 2026	Direct	F1
transaction	INSM	Common Stock	Sale	$561,350	-3,223	-1%	$174.17	315,407	08 Jan 2026	Direct	F1
holding	INSM	Common Stock						233,924	06 Jan 2026	By the Katie Procter Dynasty Trust
holding	INSM	Common Stock						50,500	06 Jan 2026	By the William Lewis Family Legacy Trust

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

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