Insmed Ownership & Insider Activity

Insmed (INSM) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 2.7% of shares outstanding. Institutional investors hold 67.3%. Over the past 90 days, insiders made 2 sales worth $3.7M.

Shares Outstanding

219.380M

Shares Float

194.832M

Insider Shares Owned

5.946M

Insider % Owned

2.7%

Institutional Shares Held

147.555M

Institutional % Held

67.3%

Ownership Breakdown

Net Insider Activity by Month

Purchases (90d)

Sales (90d)

$3.7M total

Net Activity

Net Selling

Net Value (90d)

-$3.7M

Insmed Insider Transactions (Last 6 Months)

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Date	Insider	Title	Type	Shares	Price	Value
Sep 9, 2026	David. R. Brennan	DIRECTOR	SELL	25.000K	$124.00	$3.1M
Aug 17, 2026	Melvin Sharoky M.D,	DIRECTOR	SELL	5.000K	$127.53	$638K
Aug 10, 2026	Roger Adsett	CHIEF OPERATING OFFICER	SELL-OPTIONS	—	$76.86	$27.1M
Aug 6, 2026	Martina Flammer M.D.,	CHIEF MEDICAL OFFICER	SELL-OPTIONS	—	$74.91	$2.9M
Jul 23, 2026	William Lewis	CHAIR AND CEO	SELL-OPTIONS	—	$65.50	$868K
Jul 9, 2026	William Lewis	CHAIR AND CEO	SELL-OPTIONS	—	$71.17	$989K
Jul 6, 2026	Martina Flammer M.D.,	CHIEF MEDICAL OFFICER	SELL-OPTIONS	—	$67.89	$1.0M
Jun 25, 2026	William Lewis	CHAIR AND CEO	SELL-OPTIONS	—	$64.13	$1.7M
Jun 22, 2026	Michael A. Smith	CHIEF LEGAL OFFICER	SELL	1.806K	$95.82	$173K
Jun 8, 2026	William Lewis	CHAIR AND CEO	SELL	6.515K	$94.03	$613K
Jun 3, 2026	Roger Adsett	CHIEF OPERATING OFFICER	SELL	2.370K	$102.27	$242K
Jun 3, 2026	Sara Bonstein	CHIEF FINANCIAL OFFICER	SELL	2.404K	$102.27	$246K
Jun 3, 2026	Michael A. Smith	CHIEF LEGAL OFFICER	SELL	2.159K	$102.27	$221K
Jun 3, 2026	William Lewis	CHAIR AND CEO	SELL	7.605K	$102.27	$778K
Jun 3, 2026	Martina Flammer M.D.,	CHIEF MEDICAL OFFICER	SELL	4.424K	$102.90	$455K
May 22, 2026	Michael A. Smith	CHIEF LEGAL OFFICER	SELL	6.149K	$108.47	$667K
May 18, 2026	William Lewis	CHAIR AND CEO	SELL	14.865K	$65.64	$2.5M
May 13, 2026	Sara Bonstein	CHIEF FINANCIAL OFFICER	SELL	8.272K	$116.18	$961K
May 13, 2026	Roger Adsett	CHIEF OPERATING OFFICER	SELL	5.837K	$116.18	$678K
May 13, 2026	Martina Flammer M.D.,	CHIEF MEDICAL OFFICER	SELL	18.333K	$116.12	$2.1M
May 13, 2026	Michael A. Smith	CHIEF LEGAL OFFICER	SELL	4.109K	$116.18	$477K
May 13, 2026	William Lewis	CHAIR AND CEO	SELL	13.283K	$116.18	$1.5M
May 11, 2026	Martina Flammer M.D.,	CHIEF MEDICAL OFFICER	SELL-OPTIONS	—	$58.74	$1.1M

Congressional Trading Activity

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Date	Member	Party	Chamber	Action	Amount
Jun 10, 2026	Josh Gottheimer	D	House	Sale (Partial)	$1,001 - $15,000
Oct 3, 2025	Gilbert Ray Cisneros	D	House	Sale	$1,001 - $15,000
Sep 22, 2025	Gilbert Ray Cisneros	D	House	Sale (Partial)	$1,001 - $15,000
Aug 8, 2025	Gilbert Ray Cisneros	D	House	Sale (Partial)	$1,001 - $15,000
Jul 7, 2025	Gilbert Ray Cisneros	D	House	Sale (Partial)	$1,001 - $15,000
Jun 16, 2025	Josh Gottheimer	D	House	Purchase	$1,001 - $15,000
Apr 9, 2025	Josh Gottheimer	D	House	Sale (Partial)	$1,001 - $15,000
Jun 21, 2024	Josh Gottheimer	D	House	Sale (Partial)	$1,001 - $15,000
May 28, 2024	Josh Gottheimer	D	House	Sale (Partial)	$1,001 - $15,000

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