Insmed Incorporated (INSM) Insider Trading
Over the last 3 months, INSM insiders made 0 open-market buys and 24 sales, a net sale of -$44.8M (SEC Form 4). Over the last 6 months, 545 institutions increased and 452 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
24
Net (3m)
-$44.8M
Insider trades by month Buys Sells
Mar
Apr
May
Jun
Jul
Aug
Context3-month price +13.4%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Aug 19, 2026 | SHAROKY MELVIN MDdirector | Sell | 5,000 | $127.53 |
| Aug 12, 2026 | Adsett Rogerofficer: Chief Operating Officer | Option | 76,600 | $17.16 |
| Aug 12, 2026 | Adsett Rogerofficer: Chief Operating Officer | Option | 82,280 | $13.67 |
| Aug 12, 2026 | Adsett Rogerofficer: Chief Operating Officer | Sell | 239,850 | $133.27 |
| Aug 12, 2026 | Adsett Rogerofficer: Chief Operating Officer | Option | 80,970 | $30.46 |
| Aug 7, 2026 | Flammer Martina M.D.officer: Chief Medical Officer | Sell | 8,895 | $127.00 |
| Aug 7, 2026 | Flammer Martina M.D.officer: Chief Medical Officer | Sell | 18,278 | $129.40 |
| Aug 7, 2026 | Flammer Martina M.D.officer: Chief Medical Officer | Option | 8,895 | $25.83 |
| Aug 7, 2026 | Flammer Martina M.D.officer: Chief Medical Officer | Option | 18,278 | $18.95 |
| Jul 24, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 4,828 | $105.62 |
| Jul 24, 2026 | Lewis Williamdirector, officer: Chair and CEO | Option | 6,260 | $30.46 |
| Jul 24, 2026 | Lewis Williamdirector, officer: Chair and CEO | Option | 4,440 | $17.16 |
| Jul 24, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 5,872 | $106.43 |
| Jul 10, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 2,335 | $117.62 |
| Jul 10, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 3,359 | $118.52 |
| Jul 10, 2026 | Lewis Williamdirector, officer: Chair and CEO | Option | 4,440 | $17.16 |
| Jul 10, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 5,005 | $116.55 |
| Jul 10, 2026 | Lewis Williamdirector, officer: Chair and CEO | Option | 6,259 | $30.46 |
| Jul 8, 2026 | Flammer Martina M.D.officer: Chief Medical Officer | Option | 7,945 | $29.13 |
| Jul 8, 2026 | Flammer Martina M.D.officer: Chief Medical Officer | Sell | 4,854 | $109.02 |
| Jul 8, 2026 | Flammer Martina M.D.officer: Chief Medical Officer | Option | 4,357 | $19.74 |
| Jul 8, 2026 | Flammer Martina M.D.officer: Chief Medical Officer | Sell | 7,448 | $110.60 |
| Jun 26, 2026 | Lewis Williamdirector, officer: Chair and CEO | Option | 12,518 | $30.46 |
| Jun 26, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 12,091 | $102.34 |
| Jun 26, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 1,292 | $106.27 |
| Jun 26, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 2,456 | $105.27 |
| Jun 26, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 3,723 | $104.28 |
| Jun 26, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 1,836 | $103.10 |
| Jun 26, 2026 | Lewis Williamdirector, officer: Chair and CEO | Option | 8,880 | $17.16 |
| Jun 24, 2026 | Butera Samueleofficer: SVP, GM, Global Respiratory | Grant | 7,342 | — |
Source: INSM SEC Form 4 filings, latest Aug 19, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their INSM positions over the last 6 months (SEC Form 13F).
Increased
545
New positions
217
Reduced
452
Sold out
120
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| JPMORGAN CHASE & CO | Increased | 24.2M | May 13, 2026 |
| DARWIN GLOBAL MANAGEMENT, LTD. | Reduced | 16.8M | May 15, 2026 |
| BLACKROCK, INC. | Increased | 16.7M | May 13, 2026 |
| FMR LLC | Increased | 16.1M | Aug 13, 2026 |
| BlackRock, Inc. | Reduced | 15.8M | Aug 7, 2026 |
| FMR LLC | Increased | 13.2M | May 15, 2026 |
| JPMORGAN CHASE & CO | Reduced | 10.4M | Aug 12, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 10.4M | Aug 13, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 10.4M | May 8, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 9.8M | Aug 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 9.6M | May 15, 2026 |
| BAKER BROS. ADVISORS LP | Increased | 8.8M | Aug 14, 2026 |
| Capital International Investors | Increased | 8.2M | Aug 12, 2026 |
| BAKER BROS. ADVISORS LP | Increased | 7.4M | May 15, 2026 |
| ARTISAN PARTNERS LIMITED PARTNERSHIP | Increased | 6.5M | May 13, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.