INSM
Insmed Incorporated$133.98-2.00 (-1.47%)Prev Close$135.98·MCap$30.79B·P/E—·Vol674.9K·Yield—
▲
Buys (12M)
1
$201.7K
▼
Sells (12M)
74
$225.03M
◆
Net Activity
Net Seller
$224.83M
●
Active Insiders
11
last 12 mo
Over the past 12 months, insider activity at Insmed Incorporated (INSM) has been dominated by selling, with 1 insider purchase totaling $201.7K and 74 insider sales totaling $225.03M. The most recent insider transaction was by Lewis William (director, officer: Chair and CEO), who sold $1.54M worth of shares on Apr 17, 2026. Insmed Incorporated operates in the Healthcare sector, within the Biotechnology industry, with a market cap of $30.79B.
INSM Insider Trading Activity
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Apr 17, 2026 | Lewis William | director, officer: Chair and CEO | Sell | 10,699 | $143.97 | $1.54M | 309,638 |
| Apr 8, 2026 | Lewis William | director, officer: Chair and CEO | Sell | 10,699 | $163.22 | $1.75M | 311,097 |
| Apr 3, 2026 | Adsett Roger | officer: Chief Operating Officer | Sell | 88,060 | $164.63 | $14.50M | 188,155-32% |
| Mar 31, 2026 | Smith Michael Alexander | officer: Chief Legal Officer | Sell | 19,638 | $150.98 | $2.96M | 51,871-27% |
| Mar 20, 2026 | Lewis William | director, officer: Chair and CEO | Sell | 10,699 | $143.52 | $1.54M | 310,255 |
| Feb 25, 2026 | Smith Michael Alexander | officer: Chief Legal Officer | Sell | 24,774 | $155.77 | $3.86M | 71,793-26% |
| Feb 19, 2026 | Lewis William | Chair and CEO | Sell | 10,699 | $150.97 | $1.62M | 0 |
| Feb 9, 2026 | Lewis William | Chair and CEO | Sell | 13,396 | $147.79 | $1.98M | 0 |
| Feb 5, 2026 | Flammer Martina M.D. | Chief Medical Officer | Sell | 869 | $152.44 | $132.5K | 0 |
| Feb 3, 2026 | Adsett Roger | Chief Operating Officer | Sell | 791 | $156.17 | $123.5K | 0 |
| Feb 3, 2026 | Bonstein Sara | Chief Financial Officer | Sell | 748 | $156.34 | $116.9K | 0 |
| Feb 3, 2026 | Lewis William | Chair and CEO | Sell | 3,009 | $156.34 | $470.4K | 0 |
| Feb 3, 2026 | Smith Michael Alexander | Chief Legal Officer | Sell | 640 | $156.27 | $100.0K | 0 |
| Feb 2, 2026 | Flammer Martina M.D. | Chief Medical Officer | Sell | 8,777 | $154.70 | $1.36M | 0 |
| Jan 20, 2026 | Lewis William | Chair and CEO | Sell | 10,699 | $158.93 | $1.70M | 0 |
| Jan 12, 2026 | Lewis William | Chair and CEO | Sell | 19,215 | $169.00 | $3.25M | 0 |
| Jan 9, 2026 | Flammer Martina M.D. | Chief Medical Officer | Sell | 1,887 | $186.19 | $351.3K | 0 |
| Jan 6, 2026 | Adsett Roger | Chief Operating Officer | Sell | 4,290 | $174.06 | $746.7K | 0 |
| Jan 6, 2026 | Bonstein Sara | Chief Financial Officer | Sell | 4,642 | $174.22 | $808.7K | 0 |
| Jan 6, 2026 | Flammer Martina M.D. | Chief Medical Officer | Sell | 16,530 | $174.06 | $2.88M | 0 |
| Jan 6, 2026 | Lewis William | Chair and CEO | Sell | 9,676 | $174.03 | $1.68M | 0 |
| Jan 6, 2026 | Smith Michael Alexander | Chief Legal Officer | Sell | 3,158 | $174.00 | $549.5K | 0 |
| Jan 2, 2026 | Flammer Martina M.D. | Chief Medical Officer | Sell | 12,303 | $171.38 | $2.11M | 0 |
| Jan 2, 2026 | Schaeffer Orlov S Nicole | Chief People Strategy Officer | Sell | 87,290 | $175.20 | $15.29M | 0 |
| Dec 18, 2025 | Lewis William | Chair and CEO | Sell | 10,699 | $166.97 | $1.79M | 0 |
| Dec 5, 2025 | SHAROKY MELVIN MD | Director | Sell | 20,000 | $205.01 | $4.10M | 0 |
| Dec 4, 2025 | Lewis William | Chair and CEO | Sell | 10,699 | $205.62 | $2.20M | 0 |
| Dec 1, 2025 | Flammer Martina M.D. | Chief Medical Officer | Sell | 8,895 | $206.98 | $1.84M | 0 |
| Nov 24, 2025 | ANDERSON ELIZABETH M | Director | Sell | 5,000 | $204.58 | $1.02M | 0 |
| Nov 17, 2025 | LEE LEO | Director | Sell | 75,000 | $195.90 | $14.69M | 0 |
| Nov 14, 2025 | ANDERSON ELIZABETH M | Director | Sell | 10,000 | $195.87 | $1.96M | 0 |
| Nov 12, 2025 | Schaeffer Orlov S Nicole | Chief People Strategy Officer | Sell | 30,000 | $194.00 | $5.82M | 0 |
| Nov 11, 2025 | Flammer Martina M.D. | Chief Medical Officer | Sell | 31,226 | $189.68 | $5.92M | 0 |
| Nov 3, 2025 | Smith Michael Alexander | Chief Legal Officer | Sell | 27,130 | $183.78 | $4.99M | 0 |
| Sep 12, 2025 | Schaeffer Orlov S Nicole | Chief People Strategy Officer | Sell | 76,520 | $145.45 | $11.13M | 0 |
| Sep 11, 2025 | SHAROKY MELVIN MD | Director | Sell | 10,000 | $145.39 | $1.45M | 0 |
| Sep 2, 2025 | Flammer Martina M.D. | Chief Medical Officer | Sell | 186,648 | $144.34 | $26.94M | 0 |
| Sep 2, 2025 | Smith Michael Alexander | Chief Legal Officer | Sell | 24,272 | $143.89 | $3.49M | 0 |
| Aug 20, 2025 | SHAROKY MELVIN MD | Director | Sell | 10,000 | $129.50 | $1.29M | 0 |
| Aug 19, 2025 | Adsett Roger | Chief Operating Officer | Sell | 25,000 | $127.58 | $3.19M | 0 |
| Aug 18, 2025 | Lewis William | Chair and CEO | Sell | 6,865 | $128.40 | $881.5K | 0 |
| Aug 14, 2025 | Schaeffer Orlov S Nicole | Chief People Strategy Officer | Sell | 10,000 | $127.34 | $1.27M | 0 |
| Aug 12, 2025 | SHAROKY MELVIN MD | Director | Sell | 10,000 | $121.58 | $1.22M | 0 |
| Aug 4, 2025 | Flammer Martina M.D. | Chief Medical Officer | Sell | 8,715 | $109.50 | $954.3K | 0 |
| Aug 4, 2025 | Lewis William | Chair and CEO | Sell | 6,830 | $109.81 | $750.0K | 0 |
| Jul 21, 2025 | Bonstein Sara | Chief Financial Officer | Sell | 58,400 | $102.67 | $6.00M | 0 |
| Jul 15, 2025 | Lewis William | Chair and CEO | Sell | 6,830 | $102.37 | $699.2K | 0 |
| Jul 11, 2025 | Smith Michael Alexander | Chief Legal Officer | Sell | 1,681 | $99.80 | $167.8K | 0 |
| Jul 7, 2025 | Bonstein Sara | Chief Financial Officer | Sell | 57,764 | $95.86 | $5.54M | 0 |
| Jul 1, 2025 | Lewis William | Chair and CEO | Sell | 6,830 | $98.33 | $671.6K | 0 |
Showing 1–50 of 210
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INSM Insider Buying Activity
The following table shows recent insider purchases of Insmed Incorporated (INSM) stock reported via SEC Form 4 filings.
No insider buying activity found for INSM in the last 12 months.
INSM Insider Selling Activity
The following table shows recent insider sales of Insmed Incorporated (INSM) stock reported via SEC Form 4 filings.
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Apr 17, 2026 | Lewis William | director, officer: Chair and CEO | Sell | 10,699 | $143.97 | $1.54M | 309,638 |
| Apr 8, 2026 | Lewis William | director, officer: Chair and CEO | Sell | 10,699 | $163.22 | $1.75M | 311,097 |
| Apr 3, 2026 | Adsett Roger | officer: Chief Operating Officer | Sell | 88,060 | $164.63 | $14.50M | 188,155-32% |
| Mar 31, 2026 | Smith Michael Alexander | officer: Chief Legal Officer | Sell | 19,638 | $150.98 | $2.96M | 51,871-27% |
| Mar 20, 2026 | Lewis William | director, officer: Chair and CEO | Sell | 10,699 | $143.52 | $1.54M | 310,255 |
| Feb 25, 2026 | Smith Michael Alexander | officer: Chief Legal Officer | Sell | 24,774 | $155.77 | $3.86M | 71,793-26% |
| Feb 19, 2026 | Lewis William | Chair and CEO | Sell | 10,699 | $150.97 | $1.62M | 0 |
| Feb 9, 2026 | Lewis William | Chair and CEO | Sell | 13,396 | $147.79 | $1.98M | 0 |
| Feb 5, 2026 | Flammer Martina M.D. | Chief Medical Officer | Sell | 869 | $152.44 | $132.5K | 0 |
| Feb 3, 2026 | Adsett Roger | Chief Operating Officer | Sell | 791 | $156.17 | $123.5K | 0 |
| Feb 3, 2026 | Bonstein Sara | Chief Financial Officer | Sell | 748 | $156.34 | $116.9K | 0 |
| Feb 3, 2026 | Lewis William | Chair and CEO | Sell | 3,009 | $156.34 | $470.4K | 0 |
| Feb 3, 2026 | Smith Michael Alexander | Chief Legal Officer | Sell | 640 | $156.27 | $100.0K | 0 |
| Feb 2, 2026 | Flammer Martina M.D. | Chief Medical Officer | Sell | 8,777 | $154.70 | $1.36M | 0 |
| Jan 20, 2026 | Lewis William | Chair and CEO | Sell | 10,699 | $158.93 | $1.70M | 0 |
| Jan 12, 2026 | Lewis William | Chair and CEO | Sell | 19,215 | $169.00 | $3.25M | 0 |
| Jan 9, 2026 | Flammer Martina M.D. | Chief Medical Officer | Sell | 1,887 | $186.19 | $351.3K | 0 |
| Jan 6, 2026 | Adsett Roger | Chief Operating Officer | Sell | 4,290 | $174.06 | $746.7K | 0 |
| Jan 6, 2026 | Bonstein Sara | Chief Financial Officer | Sell | 4,642 | $174.22 | $808.7K | 0 |
| Jan 6, 2026 | Flammer Martina M.D. | Chief Medical Officer | Sell | 16,530 | $174.06 | $2.88M | 0 |
| Jan 6, 2026 | Lewis William | Chair and CEO | Sell | 9,676 | $174.03 | $1.68M | 0 |
| Jan 6, 2026 | Smith Michael Alexander | Chief Legal Officer | Sell | 3,158 | $174.00 | $549.5K | 0 |
| Jan 2, 2026 | Flammer Martina M.D. | Chief Medical Officer | Sell | 12,303 | $171.38 | $2.11M | 0 |
| Jan 2, 2026 | Schaeffer Orlov S Nicole | Chief People Strategy Officer | Sell | 87,290 | $175.20 | $15.29M | 0 |
| Dec 18, 2025 | Lewis William | Chair and CEO | Sell | 10,699 | $166.97 | $1.79M | 0 |
| Dec 5, 2025 | SHAROKY MELVIN MD | Director | Sell | 20,000 | $205.01 | $4.10M | 0 |
| Dec 4, 2025 | Lewis William | Chair and CEO | Sell | 10,699 | $205.62 | $2.20M | 0 |
| Dec 1, 2025 | Flammer Martina M.D. | Chief Medical Officer | Sell | 8,895 | $206.98 | $1.84M | 0 |
| Nov 24, 2025 | ANDERSON ELIZABETH M | Director | Sell | 5,000 | $204.58 | $1.02M | 0 |
| Nov 17, 2025 | LEE LEO | Director | Sell | 75,000 | $195.90 | $14.69M | 0 |
| Nov 14, 2025 | ANDERSON ELIZABETH M | Director | Sell | 10,000 | $195.87 | $1.96M | 0 |
| Nov 12, 2025 | Schaeffer Orlov S Nicole | Chief People Strategy Officer | Sell | 30,000 | $194.00 | $5.82M | 0 |
| Nov 11, 2025 | Flammer Martina M.D. | Chief Medical Officer | Sell | 31,226 | $189.68 | $5.92M | 0 |
| Nov 3, 2025 | Smith Michael Alexander | Chief Legal Officer | Sell | 27,130 | $183.78 | $4.99M | 0 |
| Sep 12, 2025 | Schaeffer Orlov S Nicole | Chief People Strategy Officer | Sell | 76,520 | $145.45 | $11.13M | 0 |
| Sep 11, 2025 | SHAROKY MELVIN MD | Director | Sell | 10,000 | $145.39 | $1.45M | 0 |
| Sep 2, 2025 | Flammer Martina M.D. | Chief Medical Officer | Sell | 186,648 | $144.34 | $26.94M | 0 |
| Sep 2, 2025 | Smith Michael Alexander | Chief Legal Officer | Sell | 24,272 | $143.89 | $3.49M | 0 |
| Aug 20, 2025 | SHAROKY MELVIN MD | Director | Sell | 10,000 | $129.50 | $1.29M | 0 |
| Aug 19, 2025 | Adsett Roger | Chief Operating Officer | Sell | 25,000 | $127.58 | $3.19M | 0 |
| Aug 18, 2025 | Lewis William | Chair and CEO | Sell | 6,865 | $128.40 | $881.5K | 0 |
| Aug 14, 2025 | Schaeffer Orlov S Nicole | Chief People Strategy Officer | Sell | 10,000 | $127.34 | $1.27M | 0 |
| Aug 12, 2025 | SHAROKY MELVIN MD | Director | Sell | 10,000 | $121.58 | $1.22M | 0 |
| Aug 4, 2025 | Flammer Martina M.D. | Chief Medical Officer | Sell | 8,715 | $109.50 | $954.3K | 0 |
| Aug 4, 2025 | Lewis William | Chair and CEO | Sell | 6,830 | $109.81 | $750.0K | 0 |
| Jul 21, 2025 | Bonstein Sara | Chief Financial Officer | Sell | 58,400 | $102.67 | $6.00M | 0 |
| Jul 15, 2025 | Lewis William | Chair and CEO | Sell | 6,830 | $102.37 | $699.2K | 0 |
| Jul 11, 2025 | Smith Michael Alexander | Chief Legal Officer | Sell | 1,681 | $99.80 | $167.8K | 0 |
| Jul 7, 2025 | Bonstein Sara | Chief Financial Officer | Sell | 57,764 | $95.86 | $5.54M | 0 |
| Jul 1, 2025 | Lewis William | Chair and CEO | Sell | 6,830 | $98.33 | $671.6K | 0 |
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