SEC Form 4 · accession 0001685904-26-000014

INSMED Inc · INSM

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

Reporting owner

Officer — Chief Operating Officer

Period of report

Aug 10, 2026

Accepted (ET)

Aug 12, 2026 · 5:04 pm EDT

Rule 10b5-1 plan

box not checked

Issuer CIK

0001104506

Table I — non-derivative securities

Security	Date	Code	Shares	Price	A/D	Owned after	D/I
Common Stock^F1	Aug 10, 2026	M	82,280	$13.67	A	181,024	D
Common Stock	Aug 10, 2026	M	76,600	$17.16	A	257,624	D
Common Stock	Aug 10, 2026	M	80,970	$30.46	A	338,594	D
Common Stock^F2	Aug 10, 2026	S	239,850	$133.27	D	98,744	D

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	D/I
Stock Option (right to buy)^F3	$13.67	Aug 10, 2026	M	82,280	D	—	Jan 5, 2027	Common Stock	82,280	D
Stock Option (right to buy)^F3	$17.16	Aug 10, 2026	M	76,600	D	—	May 17, 2027	Common Stock	76,600	D
Stock Option (right to buy)^F3	$30.46	Aug 10, 2026	M	80,970	D	—	Jan 4, 2028	Common Stock	80,970	D

F1Includes 141 shares acquired through the Company's 2018 Employee Stock Purchase Plan.
F2This is the weighted average sales price representing 239,850 shares sold at prices ranging from $133.00 to $133.51 per share. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer the number of shares sold at each price within the price range upon request.
F3The options became exercisable based on the following vesting schedule: 25% vested on the first anniversary of the grant date and an additional 12.5% vested on each sixth month anniversary date thereafter through the fourth anniversary of the date of grant.