🕵️ Insmed Inc ($INSM)
SEC insider & ownership activity, last 12 months · CIK 1104506 · every row links its SEC filing
Over the last 12 months insiders sold $180.5M with no open-market buying against it. Flammer Martina M.d. sold $47.7M through a 10b5-1 trading plan in 45 lots (Aug–Jul). 3 planned sales are pending, the largest $1.3M (Martina Flammer). No red-flag 8-Ks in the window.
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Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 9 sellers, $180.5M (195 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Flammer Martina M.d. | 0 | – | 45 | $47.7M | Jul 6, 2026 |
| Lewis William | 0 | – | 80 | $34.4M | Jul 23, 2026 |
| Stacey Nicole Schaeffer Orlov | 0 | – | 16 | $33.5M | Jan 2, 2026 |
| Adsett Roger | 0 | – | 11 | $19.5M | Jun 3, 2026 |
| Smith Michael Alexander | 0 | – | 26 | $17.5M | Jun 22, 2026 |
| Lee Leo | 0 | – | 5 | $14.7M | Nov 17, 2025 |
| Sharoky Melvin Md | 0 | – | 4 | $8.1M | Dec 5, 2025 |
| Elizabeth M. Anderson | 0 | – | 2 | $3.0M | Nov 24, 2025 |
| Bonstein Sara | 0 | – | 6 | $2.1M | Jun 3, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Darwin Global Management, Ltd. | 7.8% | 13G | May 15, 2026 | filing ↗ | |
| Dr. Abhishek Trehan | 7.8% | 13G | May 15, 2026 | filing ↗ | |
| Blackrock, Inc. | 6.6% | 13G | Jan 21, 2026 | filing ↗ | |
| Darwin Global Master Fund, Ltd. | 6.6% | 13G | May 15, 2026 | filing ↗ | |
| FMR LLC | 6.1% | 13G | May 6, 2026 | filing ↗ | |
| Abigail P. Johnson | 6.1% | 13G | May 6, 2026 | filing ↗ | |
| Vanguard Capital Management | 5.3% | 13G | Apr 30, 2026 | filing ↗ | |
| JPMorgan Chase & Co. | exited | 13G | Jul 22, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| William Lewis | $1.1M | Jul 23, 2026 | filing ↗ |
| William Lewis | $1.3M | Jul 9, 2026 | filing ↗ |
| Martina Flammer | $1.4M | Jul 6, 2026 | filing ↗ |
| William Lewis | $2.2M | Jun 25, 2026 | filing ↗ |
| Michael Smith | $173K | Jun 22, 2026 | filing ↗ |
| William Lewis | $613K | Jun 8, 2026 | filing ↗ |
| Martina Flammer | $193K | Jun 5, 2026 | filing ↗ |
| Sara Bonstein | $246K | Jun 3, 2026 | filing ↗ |
| Martina Flammer | $262K | Jun 3, 2026 | filing ↗ |
| Roger Adsett | $242K | Jun 3, 2026 | filing ↗ |
| Michael Smith | $221K | Jun 3, 2026 | filing ↗ |
| William Lewis | $778K | Jun 3, 2026 | filing ↗ |
| Michael Smith | $667K | May 22, 2026 | filing ↗ |
| William Lewis | $2.7M | May 18, 2026 | filing ↗ |
| Martina Flammer | $1.2M | May 14, 2026 | filing ↗ |
| Roger Adsett | $678K | May 13, 2026 | filing ↗ |
| Michael Smith | $477K | May 13, 2026 | filing ↗ |
| Sara Bonstein | $961K | May 13, 2026 | filing ↗ |
| Martina Flammer | $897K | May 13, 2026 | filing ↗ |
| William Lewis | $1.5M | May 13, 2026 | filing ↗ |
| Martina Flammer | $1.3M | May 11, 2026 | filing ↗ |
| William Lewis | $1.5M | May 4, 2026 | filing ↗ |
| William Lewis | $1.5M | Apr 16, 2026 | filing ↗ |
| William Lewis | $1.7M | Apr 6, 2026 | filing ↗ |
| Roger Adsett | $14.5M | Apr 1, 2026 | filing ↗ |
| Michael Smith | $3.0M | Mar 30, 2026 | filing ↗ |
| William Lewis | $1.5M | Mar 19, 2026 | filing ↗ |
| William Lewis | $1.6M | Mar 5, 2026 | filing ↗ |
| Michael Smith | $3.9M | Feb 24, 2026 | filing ↗ |
| William Lewis | $1.6M | Feb 19, 2026 | filing ↗ |
| William Lewis | $2.0M | Feb 9, 2026 | filing ↗ |
| Martina Flammer | $132K | Feb 5, 2026 | filing ↗ |
| Roger Adsett | $124K | Feb 3, 2026 | filing ↗ |
| Michael Smith | $100K | Feb 3, 2026 | filing ↗ |
| William Lewis | $470K | Feb 3, 2026 | filing ↗ |
| Martina Flammer | $124K | Feb 3, 2026 | filing ↗ |
| Sara Bonstein | $117K | Feb 3, 2026 | filing ↗ |
| Martina Flammer | $1.2M | Feb 2, 2026 | filing ↗ |
| William Lewis | $1.7M | Jan 20, 2026 | filing ↗ |
| William Lewis | $3.2M | Jan 12, 2026 | filing ↗ |
| Sara Bonstein | $252K | Jan 8, 2026 | filing ↗ |
| Martina Flammer | $895K | Jan 8, 2026 | filing ↗ |
| Martina Flammer | $289K | Jan 8, 2026 | filing ↗ |
| Roger Adsett | $359K | Jan 8, 2026 | filing ↗ |
| Michael Smith | $183K | Jan 8, 2026 | filing ↗ |
| William Lewis | $561K | Jan 8, 2026 | filing ↗ |
| Roger Adsett | $140K | Jan 7, 2026 | filing ↗ |
| Michael Smith | $124K | Jan 7, 2026 | filing ↗ |
| William Lewis | $413K | Jan 7, 2026 | filing ↗ |
| Sara Bonstein | $294K | Jan 7, 2026 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Reg FD disclosure (7.01) | Jul 16, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 16, 2026 | filing ↗ |
| Shareholder vote (5.07) | May 13, 2026 | filing ↗ |
| Earnings (2.02) | May 7, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 7, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Apr 7, 2026 | filing ↗ |
| Other events (8.01) | Apr 7, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Apr 7, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Mar 23, 2026 | filing ↗ |
| Other events (8.01) | Mar 23, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 23, 2026 | filing ↗ |
| Earnings (2.02) | Feb 17, 2026 | filing ↗ |
| Officer/director changes (5.02) | Feb 17, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 17, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jan 9, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 9, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Dec 17, 2025 | filing ↗ |
| Other events (8.01) | Dec 17, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 17, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Nov 18, 2025 | filing ↗ |
| Other events (8.01) | Nov 18, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 18, 2025 | filing ↗ |
| Earnings (2.02) | Oct 30, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Oct 30, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Aug 12, 2025 | filing ↗ |
| Other events (8.01) | Aug 12, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 12, 2025 | filing ↗ |
| Earnings (2.02) | Aug 7, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 7, 2025 | filing ↗ |