INSM
INSMED Inc · Healthcare · Market cap $20.8B
Insiders sold $40.3M net in the last 90 days ·5 sellers, 0 buyers· 2 of 5 sales under Rule 10b5-1 plans· latest Form 4 filed Sep 11, 2026
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$167.1M
reported sales (SEC code S)
Unique Insiders
10
in the rolling window
Latest filing
Oct 20, 2026
Brennan David R
INSMED Inc (INSM) has 77 SEC Form 4 filings (249 transaction rows) in the rolling window, disclosed by 10 distinct insiders. Most recent filing: Oct 20, 2026.
Inside the rolling window, 10 insiders at INSMED Inc reported no open-market purchases and 72 open-market sales totaling $167.1M. The most active filer is Chair and CEO Lewis William with 22 filings. Insiders have net sold $59.8M over the trailing 6 months. The most recent open-market filing is a sale of 25,000 shares by Director Brennan David R, dated Sep 9, 2026, worth $3.1M.
- Industry:Biotechnology
- CEO:William H. Lewis
- Employees:1,664
- HQ:Bridgewater, NJ, US
- IPO:2000-06-01
| Source | |||||||
|---|---|---|---|---|---|---|---|
Brennan David RFirst filing | Director | Sale | 25,000 | $3.1M | Sep 11 | -26.5% | SEC ↗ |
SHAROKY MELVIN MDFirst in 8 months | Director | Sale | 5,000 | $638K | Aug 19 | -27.2% | SEC ↗ |
| Chief Operating Officer | Sale | 239,850 | $32.0M | Aug 12 | -28.1% | SEC ↗ | |
| Chief Medical Officer | Sale | 27,173 | $3.5M | Aug 7 | -27.5% | SEC ↗ | |
| Chair and CEO | Sale | 10,700 | $1.1M | Jul 24 | -11.1% | SEC ↗ | |
| Chair and CEO | Sale | 10,699 | $1.3M | Jul 10 | -17.8% | SEC ↗ | |
| Chief Medical Officer | Sale | 12,302 | $1.4M | Jul 8 | — | SEC ↗ | |
| Chair and CEO | Sale | 21,398 | $2.2M | Jun 26 | — | SEC ↗ | |
| Chief Legal Officer | Sale | 1,806 | $173K | Jun 24 | — | SEC ↗ | |
| Chair and CEO | Sale | 6,515 | $613K | Jun 10 | — | SEC ↗ | |
| Chief Medical Officer | Sale | 2,566 | $262K | Jun 5 | — | SEC ↗ | |
| Chief Medical Officer | Sale | 1,858 | $193K | Jun 5 | — | SEC ↗ | |
| Chief Legal Officer | Sale | 2,159 | $221K | Jun 5 | — | SEC ↗ | |
| Chair and CEO | Sale | 7,605 | $778K | Jun 5 | — | SEC ↗ | |
| Chief Financial Officer | Sale | 2,404 | $246K | Jun 5 | — | SEC ↗ | |
| Chief Operating Officer | Sale | 2,370 | $242K | Jun 5 | — | SEC ↗ | |
| Chief Legal Officer | Sale | 6,149 | $667K | May 22 | — | SEC ↗ | |
| Chair and CEO | Sale | 25,564 | $2.7M | May 20 | — | SEC ↗ | |
| Chief Medical Officer | Sale | 7,854 | $897K | May 15 | — | SEC ↗ | |
| Chief Medical Officer | Sale | 10,479 | $1.2M | May 15 | — | SEC ↗ | |
| Chief Operating Officer | Sale | 5,837 | $678K | May 15 | — | SEC ↗ | |
| Chair and CEO | Sale | 13,283 | $1.5M | May 15 | — | SEC ↗ | |
Bonstein SaraFirst in 3 months | Chief Financial Officer | Sale | 8,272 | $961K | May 15 | — | SEC ↗ |
| Chief Legal Officer | Sale | 4,109 | $477K | May 15 | — | SEC ↗ | |
Flammer Martina M.D.First in 3 months | Chief Medical Officer | Sale | 12,949 | $1.3M | May 13 | — | SEC ↗ |
Earnings: last 7 quarters
Congress trading INSM 15 all-time
- DRep. Josh GottheimerSale$1,001 - $15,0002026-06-10
- DRep. Josh S. GottheimerSale$1,001 - $15,0002026-06-10
- DRep. Gilbert Ray CisnerosOther$1,001 - $15,0002025-10-03
- DRep. Gilbert Ray CisnerosOther$1,001 - $15,0002025-09-22
- DRep. Gilbert Ray CisnerosOther$1,001 - $15,0002025-09-22
- DRep. Gilbert Ray CisnerosOther$1,001 - $15,0002025-09-22
STOCK Act disclosures are filed up to 45 days after the trade. Amount is a disclosed range, not an exact figure.
Frequently asked questions
How many SEC Form 4 insider filings does INSM have?
INSMED Inc (INSM) has 77 SEC Form 4 filings (249 transaction rows) in the rolling 365-day window, disclosed by 10 distinct insiders. Most recent filing: Oct 20, 2026.
When was the most recent SEC Form 4 filing for INSM?
The most recent Form 4 filing for INSM on Tracefour is dated Oct 20, 2026.
Who is the most active insider at INSM?
The most active SEC Form 4 filer at INSM in the rolling window is Chair and CEO Lewis William, with 22 filings.
What is the net insider flow at INSM over the last 6 months?
Over the trailing 180 days, insiders at INSM have net sold $59.8M based on SEC Form 4 disclosures.
What is the total insider buy and sell value at INSM in the current window?
Inside the rolling window, insiders at INSM bought $0 and sold $167.1M based on SEC Form 4 filings.
Can I get alerts for INSM insider trading?
Yes. Tracefour sends a free email when a new SEC Form 4 purchase or sale is filed at INSMED Inc (INSM). Alerts are set per company from the page itself, there is no paid tier, and each email links to the original filing on SEC EDGAR.
Related companies
INSMED Inc is in the Healthcare sector.