Insmed Inc. Insider Trading

INSM

Last 12 months

Insiders sold $162M and bought nothing on the open market.

55% of the selling was scheduled in advance under 10b5-1 plans. Chief Operating Officer Roger Adsett sold $32M on Aug 10, 71% of their stake, outside a plan. The last open-market buy by an executive or director was in May 2025.

Net open-market

−$162M

0 buys · 58 sales

Under a 10b5-1 plan

55%

of the value sold

Insiders who bought / sold

0 / 10

executives and directors

Last open-market buy

May 2025

May 21, 2025

Get an email when INSM's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Sep 9	David R Brennan Director	SoldNo plan	25,000	$124.00	$3.1M	20%	Form 4
Aug 17	Melvin Md Sharoky Director	SoldNo plan	5,000	$127.53	638K	1.8%	Form 4
Aug 10	Roger Adsett Chief Operating Officer	SoldNo plan	239,850	$133.27	$32M	71%	Form 4
Aug 6	Martina M.d. Flammer Chief Medical Officer	Sold10b5-1 plan 2 parts	27,173	$128.61 average	$3.49M	31%	Form 4
Jul 23	William Lewis Chair and CEO	Sold10b5-1 plan 2 parts	10,700	$106.06 average	$1.13M	2.1%	Form 4
Jul 9	William Lewis Chair and CEO	Sold10b5-1 plan 3 parts	10,699	$117.40 average	$1.26M	2.1%	Form 4
Jul 6	Martina M.d. Flammer Chief Medical Officer	Sold10b5-1 plan 2 parts	12,302	$109.98 average	$1.35M	17%	Form 4
Jun 25	William Lewis Chair and CEO	Sold10b5-1 plan 5 parts	21,398	$103.32 average	$2.21M	4.2%	Form 4
Jun 22	Michael Alexander Smith Chief Legal Officer	Sold10b5-1 plan	1,806	$95.82	173K	4.6%	Form 4
Jun 8	William Lewis Chair and CEO	Sold10b5-1 plan	6,515	$94.03	613K	1.3%	Form 4
Jun 3 – 5	Martina M.d. Flammer Chief Medical Officer	Sold10b5-1 plan 2 parts	4,424	$102.90 average	455K	6.8%	Form 4
Jun 3	Michael Alexander Smith Chief Legal Officer	SoldNo plan	2,159	$102.27	221K	5.2%	Form 4
Jun 3	Roger Adsett Chief Operating Officer	SoldNo plan	2,370	$102.27	242K	2.3%	Form 4
Jun 3	Sara Bonstein Chief Financial Officer	SoldNo plan	2,404	$102.27	246K	3.4%	Form 4
Jun 3	William Lewis Chair and CEO	SoldNo plan	7,605	$102.27	778K	1.5%	Form 4
May 22	Michael Alexander Smith Chief Legal Officer	Sold10b5-1 plan	6,149	$108.47	667K	13%	Form 4
May 18	William Lewis Chair and CEO	Sold10b5-1 plan 3 parts	25,564	$106.33 average	$2.72M	4.8%	Form 4
May 13 – 14	Martina M.d. Flammer Chief Medical Officer	Sold10b5-1 plan 3 parts	18,333	$116.12 average	$2.13M	22%	Form 4
May 13	Michael Alexander Smith Chief Legal Officer	SoldNo plan	4,109	$116.18	477K	7.9%	Form 4
May 13	Roger Adsett Chief Operating Officer	SoldNo plan	5,837	$116.18	678K	5.5%	Form 4
May 13	Sara Bonstein Chief Financial Officer	SoldNo plan	8,272	$116.18	961K	10%	Form 4
May 13	William Lewis Chair and CEO	SoldNo plan	13,283	$116.18	$1.54M	2.5%	Form 4
May 11	Martina M.d. Flammer Chief Medical Officer	Sold10b5-1 plan 2 parts	12,949	$100.40 average	$1.3M	13%	Form 4
May 4	William Lewis Chair and CEO	Sold10b5-1 plan 6 parts	10,699	$137.34 average	$1.47M	2.0%	Form 4
Apr 16	William Lewis Chair and CEO	Sold10b5-1 plan 4 parts	10,699	$143.97 average	$1.54M	2.0%	Form 4
Apr 6	William Lewis Chair and CEO	Sold10b5-1 plan 3 parts	10,699	$163.22 average	$1.75M	2.0%	Form 4
Apr 1	Roger Adsett Chief Operating Officer	Sold10b5-1 plan 3 parts	88,060	$164.63 average	$14.5M	45%	Form 4
Mar 30	Michael Alexander Smith Chief Legal Officer	Sold10b5-1 plan	19,638	$150.98	$2.96M	27%	Form 4
Mar 19	William Lewis Chair and CEO	Sold10b5-1 plan 3 parts	10,699	$143.52 average	$1.54M	2.0%	Form 4
Mar 5	William Lewis Chair and CEO	Sold10b5-1 plan 4 parts	10,699	$146.03 average	$1.56M	2.0%	Form 4
Feb 24	Michael Alexander Smith Chief Legal Officer	Sold10b5-1 plan 3 parts	24,774	$155.77 average	$3.86M	32%	Form 4
Feb 19	William Lewis Chair and CEO	Sold10b5-1 plan 5 parts	10,699	$150.97 average	$1.62M	1.8%	Form 4
Feb 9	William Lewis Chair and CEO	Sold10b5-1 plan 3 parts	13,396	$147.79 average	$1.98M	2.2%	Form 4
Feb 5	Martina M.d. Flammer Chief Medical Officer	Sold10b5-1 plan	869	$152.44	132K	1.0%	Form 4
Feb 3	Michael Alexander Smith Chief Legal Officer	SoldNo plan	640	$156.27	100K	1.1%	Form 4
Feb 2 – 3	Martina M.d. Flammer Chief Medical Officer	Sold10b5-1 plan 6 parts	8,777	$154.70 average	$1.36M	9.4%	Form 4
Feb 3	Roger Adsett Chief Operating Officer	SoldNo plan	791	$156.17	124K	0.7%	Form 4
Feb 3	Sara Bonstein Chief Financial Officer	SoldNo plan	748	$156.34	117K	0.9%	Form 4
Feb 3	William Lewis Chair and CEO	SoldNo plan	3,009	$156.34	470K	0.5%	Form 4
Jan 20	William Lewis Chair and CEO	Sold10b5-1 plan 5 parts	10,699	$158.93 average	$1.7M	1.8%	Form 4

Sep 9No plan
David R Brennan
Director · sold 25,000 at $124.00
$3.1M
20% of stake
Aug 17No plan
Melvin Md Sharoky
Director · sold 5,000 at $127.53
638K
1.8% of stake
Aug 10No plan
Roger Adsett
Chief Operating Officer · sold 239,850 at $133.27
$32M
71% of stake
Aug 610b5-1 plan
Martina M.d. Flammer
Chief Medical Officer · sold 27,173 at avg $128.61
$3.49M
31% of stake
Jul 2310b5-1 plan
William Lewis
Chair and CEO · sold 10,700 at avg $106.06
$1.13M
2.1% of stake
Jul 910b5-1 plan
William Lewis
Chair and CEO · sold 10,699 at avg $117.40
$1.26M
2.1% of stake
Jul 610b5-1 plan
Martina M.d. Flammer
Chief Medical Officer · sold 12,302 at avg $109.98
$1.35M
17% of stake
Jun 2510b5-1 plan
William Lewis
Chair and CEO · sold 21,398 at avg $103.32
$2.21M
4.2% of stake
Jun 2210b5-1 plan
Michael Alexander Smith
Chief Legal Officer · sold 1,806 at $95.82
173K
4.6% of stake
Jun 810b5-1 plan
William Lewis
Chair and CEO · sold 6,515 at $94.03
613K
1.3% of stake
Jun 3 – 510b5-1 plan
Martina M.d. Flammer
Chief Medical Officer · sold 4,424 at avg $102.90
455K
6.8% of stake
Jun 3No plan
Michael Alexander Smith
Chief Legal Officer · sold 2,159 at $102.27
221K
5.2% of stake
Jun 3No plan
Roger Adsett
Chief Operating Officer · sold 2,370 at $102.27
242K
2.3% of stake
Jun 3No plan
Sara Bonstein
Chief Financial Officer · sold 2,404 at $102.27
246K
3.4% of stake
Jun 3No plan
William Lewis
Chair and CEO · sold 7,605 at $102.27
778K
1.5% of stake
May 2210b5-1 plan
Michael Alexander Smith
Chief Legal Officer · sold 6,149 at $108.47
667K
13% of stake
May 1810b5-1 plan
William Lewis
Chair and CEO · sold 25,564 at avg $106.33
$2.72M
4.8% of stake
May 13 – 1410b5-1 plan
Martina M.d. Flammer
Chief Medical Officer · sold 18,333 at avg $116.12
$2.13M
22% of stake
May 13No plan
Michael Alexander Smith
Chief Legal Officer · sold 4,109 at $116.18
477K
7.9% of stake
May 13No plan
Roger Adsett
Chief Operating Officer · sold 5,837 at $116.18
678K
5.5% of stake
May 13No plan
Sara Bonstein
Chief Financial Officer · sold 8,272 at $116.18
961K
10% of stake
May 13No plan
William Lewis
Chair and CEO · sold 13,283 at $116.18
$1.54M
2.5% of stake
May 1110b5-1 plan
Martina M.d. Flammer
Chief Medical Officer · sold 12,949 at avg $100.40
$1.3M
13% of stake
May 410b5-1 plan
William Lewis
Chair and CEO · sold 10,699 at avg $137.34
$1.47M
2.0% of stake
Apr 1610b5-1 plan
William Lewis
Chair and CEO · sold 10,699 at avg $143.97
$1.54M
2.0% of stake
Apr 610b5-1 plan
William Lewis
Chair and CEO · sold 10,699 at avg $163.22
$1.75M
2.0% of stake
Apr 110b5-1 plan
Roger Adsett
Chief Operating Officer · sold 88,060 at avg $164.63
$14.5M
45% of stake
Mar 3010b5-1 plan
Michael Alexander Smith
Chief Legal Officer · sold 19,638 at $150.98
$2.96M
27% of stake
Mar 1910b5-1 plan
William Lewis
Chair and CEO · sold 10,699 at avg $143.52
$1.54M
2.0% of stake
Mar 510b5-1 plan
William Lewis
Chair and CEO · sold 10,699 at avg $146.03
$1.56M
2.0% of stake
Feb 2410b5-1 plan
Michael Alexander Smith
Chief Legal Officer · sold 24,774 at avg $155.77
$3.86M
32% of stake
Feb 1910b5-1 plan
William Lewis
Chair and CEO · sold 10,699 at avg $150.97
$1.62M
1.8% of stake
Feb 910b5-1 plan
William Lewis
Chair and CEO · sold 13,396 at avg $147.79
$1.98M
2.2% of stake
Feb 510b5-1 plan
Martina M.d. Flammer
Chief Medical Officer · sold 869 at $152.44
132K
1.0% of stake
Feb 3No plan
Michael Alexander Smith
Chief Legal Officer · sold 640 at $156.27
100K
1.1% of stake
Feb 2 – 310b5-1 plan
Martina M.d. Flammer
Chief Medical Officer · sold 8,777 at avg $154.70
$1.36M
9.4% of stake
Feb 3No plan
Roger Adsett
Chief Operating Officer · sold 791 at $156.17
124K
0.7% of stake
Feb 3No plan
Sara Bonstein
Chief Financial Officer · sold 748 at $156.34
117K
0.9% of stake
Feb 3No plan
William Lewis
Chair and CEO · sold 3,009 at $156.34
470K
0.5% of stake
Jan 2010b5-1 plan
William Lewis
Chair and CEO · sold 10,699 at avg $158.93
$1.7M
1.8% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch INSM, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Held by ETFs

INSM is in 162 US ETFs. The largest of them, with INSM's weight in each:

Spot a number that looks wrong? Check it in INSM's SEC filings or

Download this analysis as a PDF (Pro)

Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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