Insider Trading for INSM
View recent insider trading activity including purchases, sales, and awards. Insider trading can provide insights into how executives view their company's prospects.
Insider Trading Summary
Shares Acquired
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Shares Disposed
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Net Position
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Recent Activity (30 Days)
Acquisitions: 33.7K shares
Dispositions: 67.4K shares
Net: -33.7K shares
Insiders have been net sellers recently, which could indicate concerns about current valuation or short-term outlook.
Quarterly Activity (3 Months)
Acquisitions: 129.2K shares
Dispositions: 277.0K shares
Net: -147.8K shares
Insiders have been net sellers over the quarter, which institutional investors may view as a cautionary signal.
Key Insider Activity: Mar 19, 2026 to Jul 23, 2026
Adsett Roger
ExecutiveCorporate Officer
-96.3K shares
7 transactions
Lewis William
ExecutiveChief Executive Officer
-123.4K shares
58 transactions
Flammer Martina M.D.
ExecutiveCorporate Officer
-48.0K shares
15 transactions
Smith Michael Alexander
ExecutiveCorporate Officer
-33.9K shares
9 transactions
Butera Samuele
ExecutiveVice President
+19.9K shares
3 transactions
Transaction Details
| Date | Insider | Role | Transaction | Shares | Price | Value | Owned After | SEC Filing |
|---|---|---|---|---|---|---|---|---|
| Jul 23, 2026 | Lewis William | EChief Executive Officer | Exercise | 4.4K | $17.16 | $76,190.40 | 269.8K | View |
| Jul 23, 2026 | Lewis William | EChief Executive Officer | Exercise | 6.3K | $30.46 | $190,679.60 | 265.3K | View |
| Jul 23, 2026 | Lewis William | EChief Executive Officer | Sale | 4.8K | $105.62 | $509,933.36 | 264.9K | View |
Jul 23, 2026 | Locked | — | — | — | — | — | — | — |
Jul 23, 2026 | Locked | — | — | — | — | — | — | — |
Jul 23, 2026 | Locked | — | — | — | — | — | — | — |
Jul 9, 2026 | Locked | — | — | — | — | — | — | — |
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Jul 9, 2026 | Locked | — | — | — | — | — | — | — |
Jul 6, 2026 | Locked | — | — | — | — | — | — | — |
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Jun 25, 2026 | Locked | — | — | — | — | — | — | — |
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Jun 25, 2026 | Locked | — | — | — | — | — | — | — |
Jun 23, 2026 | Locked | — | — | — | — | — | — | — |
Jun 23, 2026 | Locked | — | — | — | — | — | — | — |
Jun 23, 2026 | Locked | — | — | — | — | — | — | — |
Jun 22, 2026 | Locked | — | — | — | — | — | — | — |
Jun 8, 2026 | Locked | — | — | — | — | — | — | — |
Jun 5, 2026 | Locked | — | — | — | — | — | — | — |
Jun 3, 2026 | Locked | — | — | — | — | — | — | — |
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May 22, 2026 | Locked | — | — | — | — | — | — | — |
May 18, 2026 | Locked | — | — | — | — | — | — | — |
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May 18, 2026 | Locked | — | — | — | — | — | — | — |
May 14, 2026 | Locked | — | — | — | — | — | — | — |
May 13, 2026 | Locked | — | — | — | — | — | — | — |
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May 11, 2026 | Locked | — | — | — | — | — | — | — |
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May 4, 2026 | Locked | — | — | — | — | — | — | — |
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May 4, 2026 | Locked | — | — | — | — | — | — | — |
Apr 16, 2026 | Locked | — | — | — | — | — | — | — |
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Apr 6, 2026 | Locked | — | — | — | — | — | — | — |
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Apr 1, 2026 | Locked | — | — | — | — | — | — | — |
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Mar 30, 2026 | Locked | — | — | — | — | — | — | — |
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Mar 30, 2026 | Locked | — | — | — | — | — | — | — |
Mar 30, 2026 | Locked | — | — | — | — | — | — | — |
Mar 19, 2026 | Locked | — | — | — | — | — | — | — |
Click "View" in the SEC Filing column to access the detailed SEC form submission for each transaction.
Executive Activity:
Executives have been net sellers of INSM stock, though this may be part of planned diversification.