Insmed Incorporated (INSM) Insider Trading
Over the last 3 months, INSM insiders made 0 open-market buys and 33 sales, a net sale of -$34.2M (SEC Form 4). Over the last 6 months, 576 institutions increased and 399 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
33
Net (3m)
-$34.2M
Insider trades by month Buys Sells
Dec
Jan
Feb
Mar
Apr
May
Context3-month price -30.7%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| May 22, 2026 | Smith Michael Alexanderofficer: Chief Legal Officer | Sell | 6,149 | $108.47 |
| May 20, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 11,836 | $106.39 |
| May 20, 2026 | Lewis Williamdirector, officer: Chair and CEO | Option | 4,440 | $17.16 |
| May 20, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 7,975 | $106.97 |
| May 20, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 5,753 | $105.32 |
| May 20, 2026 | Lewis Williamdirector, officer: Chair and CEO | Option | 6,259 | $30.46 |
| May 15, 2026 | Flammer Martina M.D.officer: Chief Medical Officer | Sell | 10,479 | $117.54 |
| May 15, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 13,283 | $116.18 |
| May 15, 2026 | ANDERSON ELIZABETH Mdirector | Grant | 3,305 | — |
| May 15, 2026 | Bonstein Saraofficer: Chief Financial Officer | Sell | 8,272 | $116.18 |
| May 15, 2026 | Smith Michael Alexanderofficer: Chief Legal Officer | Sell | 4,109 | $116.18 |
| May 15, 2026 | LEE LEOdirector | Grant | 3,305 | — |
| May 15, 2026 | Desjardins Clarissadirector | Grant | 3,305 | — |
| May 15, 2026 | SHAROKY MELVIN MDdirector | Grant | 3,305 | — |
| May 15, 2026 | Brennan David Rdirector | Grant | 3,305 | — |
| May 15, 2026 | SCHAFER CAROLdirector | Grant | 3,305 | — |
| May 15, 2026 | Adsett Rogerofficer: Chief Operating Officer | Sell | 5,837 | $116.18 |
| May 15, 2026 | Flammer Martina M.D.officer: Chief Medical Officer | Sell | 3,384 | $116.18 |
| May 15, 2026 | Flammer Martina M.D.officer: Chief Medical Officer | Sell | 4,470 | $112.76 |
| May 13, 2026 | Flammer Martina M.D.officer: Chief Medical Officer | Sell | 12,119 | $100.35 |
| May 13, 2026 | Flammer Martina M.D.officer: Chief Medical Officer | Option | 12,949 | $17.07 |
| May 13, 2026 | Flammer Martina M.D.officer: Chief Medical Officer | Sell | 830 | $101.18 |
| May 6, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 381 | $139.60 |
| May 6, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 1,247 | $139.09 |
| May 6, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 433 | $134.18 |
| May 6, 2026 | Lewis Williamdirector, officer: Chair and CEO | Option | 4,440 | $17.16 |
| May 6, 2026 | Lewis Williamdirector, officer: Chair and CEO | Option | 6,259 | $30.46 |
| May 6, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 2,721 | $137.86 |
| May 6, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 599 | $135.18 |
| May 6, 2026 | Lewis Williamdirector, officer: Chair and CEO | Sell | 5,318 | $137.01 |
Source: INSM SEC Form 4 filings, latest May 22, 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
576
New positions
269
Reduced
399
Sold out
177
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| JPMORGAN CHASE & CO | Increased | 24.2M | May 13, 2026 |
| JPMORGAN CHASE & CO | Increased | 23.2M | Feb 11, 2026 |
| VANGUARD GROUP INC | Increased | 21.1M | Jan 29, 2026 |
| DARWIN GLOBAL MANAGEMENT, LTD. | Increased | 20.9M | Feb 17, 2026 |
| DARWIN GLOBAL MANAGEMENT, LTD. | Reduced | 16.8M | May 15, 2026 |
| BLACKROCK, INC. | Increased | 16.7M | May 13, 2026 |
| BLACKROCK, INC. | Increased | 15.1M | Feb 12, 2026 |
| FMR LLC | Increased | 13.2M | May 15, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 10.4M | May 8, 2026 |
| FMR LLC | Increased | 9.9M | Feb 17, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 9.6M | May 15, 2026 |
| BAKER BROS. ADVISORS LP | Increased | 7.4M | May 15, 2026 |
| BAKER BROS. ADVISORS LP | Reduced | 6.6M | Feb 17, 2026 |
| ARTISAN PARTNERS LIMITED PARTNERSHIP | Increased | 6.5M | May 13, 2026 |
| D. E. SHAW & CO., INC. | Increased | 5.6M | May 15, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.