INSM
insider transactionsINSMED Inc — buys & sells by directors, officers and 10% owners A shareholder owning more than 10% of the company. Must report trades, but usually a weaker signal than an officer or director. (SEC Form 4).
Net shares · 90d
-259.8K
0 buy · 259.8K sell
Net value · 90d
-$35.2M
$0 in · $35.2M out
Sentiment · 90d
Net selling
0% buying · 100% selling
Open-market trades · 90d
37
0 buy · 259.8K sell
Net buy / sell volume
Not enough data to chart yet.
Tap or hover the chart for daily net volume. Green = net buying, red = net selling.
All transactions
-
Grant·A
Director
$0
5.0K sh
Own New
-
Grant·A
Director
$0
14.6K sh
Own New
-
Grant·A
Director
$0
3.6K sh
Own New
-
Sell·S
William Lewis KEY
Chair and CEO · 10b5-1
$612.6K
6.5K sh · $94.03
Own -2%
-
Sell·S
Chief Medical Officer · 10b5-1
$192.8K
1.9K sh · $103.78
Own -3%
-
Sell·S
Chief Legal Officer
$220.8K
2.2K sh · $102.27
Own -5%
-
Sell·S
William Lewis KEY
Chair and CEO
$777.8K
7.6K sh · $102.27
Own -3%
-
Sell·S
Chief Medical Officer · 10b5-1
$262.4K
2.6K sh · $102.27
Own -4%
-
Sell·S
Sara Bonstein KEY
Chief Financial Officer
$245.9K
2.4K sh · $102.27
Own -3%
-
Sell·S
Chief Operating Officer
$242.4K
2.4K sh · $102.27
Own -2%
-
Sell·S
Chief Legal Officer · 10b5-1
$667.0K
6.1K sh · $108.47
Own -13%
-
Exercise·M
William Lewis KEY
Chair and CEO · 10b5-1
$0
4.4K sh
Own +33%
-
Exercise·M
William Lewis KEY
Chair and CEO · 10b5-1
$0
6.3K sh
Own +33%
-
Sell·S
William Lewis KEY
Chair and CEO · 10b5-1
$853.1K
8.0K sh · $106.97
Own -3%
-
Sell·S
William Lewis KEY
Chair and CEO · 10b5-1
$1.3M
11.8K sh · $106.39
Own -4%
-
Sell·S
William Lewis KEY
Chair and CEO · 10b5-1
$605.9K
5.8K sh · $105.32
Own -2%
-
Exercise·M
William Lewis KEY
Chair and CEO · 10b5-1
$76.2K
4.4K sh · $17.16
Own +2%
-
Exercise·M
William Lewis KEY
Chair and CEO · 10b5-1
$190.6K
6.3K sh · $30.46
Own +2%
-
Sell·S
Chief Medical Officer · 10b5-1
$1.2M
10.5K sh · $117.54
Own -14%
-
Sell·S
Chief Legal Officer
$477.4K
4.1K sh · $116.18
Own -8%
-
Grant·A
Director
—
3.3K sh
Own +6%
-
Sell·S
William Lewis KEY
Chair and CEO
$1.5M
13.3K sh · $116.18
Own -4%
-
Grant·A
Director
—
3.3K sh
Own +5%
-
Grant·A
Director
—
3.3K sh
Own +1%
-
Sell·S
Chief Medical Officer · 10b5-1
$393.2K
3.4K sh · $116.18
Own -4%
-
Sell·S
Chief Medical Officer · 10b5-1
$504.0K
4.5K sh · $112.76
Own -5%
-
Grant·A
Director
—
3.3K sh
Own +5%
-
Grant·A
Director
—
3.3K sh
Own +5%
-
Sell·S
Sara Bonstein KEY
Chief Financial Officer
$961.0K
8.3K sh · $116.18
Own -10%
-
Sell·S
Chief Operating Officer
$678.1K
5.8K sh · $116.18
Own -5%
-
Exercise·M
Chief Medical Officer · 10b5-1
$0
12.9K sh
Own New
-
Sell·S
Chief Medical Officer · 10b5-1
$84.0K
830 sh · $101.18
Own -1%
-
Sell·S
Chief Medical Officer · 10b5-1
$1.2M
12.1K sh · $100.35
Own -13%
-
Exercise·M
Chief Medical Officer · 10b5-1
$221.0K
12.9K sh · $17.07
Own +16%
-
Exercise·M
William Lewis KEY
Chair and CEO · 10b5-1
$0
4.4K sh
Own +25%
-
Exercise·M
William Lewis KEY
Chair and CEO · 10b5-1
$0
6.3K sh
Own +25%
-
Sell·S
William Lewis KEY
Chair and CEO · 10b5-1
$53.2K
381 sh · $139.60
Own -0%
-
Sell·S
William Lewis KEY
Chair and CEO · 10b5-1
$173.4K
1.2K sh · $139.09
Own -0%
-
Sell·S
William Lewis KEY
Chair and CEO · 10b5-1
$375.1K
2.7K sh · $137.86
Own -1%
-
Sell·S
William Lewis KEY
Chair and CEO · 10b5-1
$728.6K
5.3K sh · $137.01
Own -2%
-
Sell·S
William Lewis KEY
Chair and CEO · 10b5-1
$81.0K
599 sh · $135.18
Own -0%
-
Sell·S
William Lewis KEY
Chair and CEO · 10b5-1
$58.1K
433 sh · $134.18
Own -0%
-
Exercise·M
William Lewis KEY
Chair and CEO · 10b5-1
$76.2K
4.4K sh · $17.16
Own +1%
-
Exercise·M
William Lewis KEY
Chair and CEO · 10b5-1
$190.6K
6.3K sh · $30.46
Own +2%
-
Exercise·M
William Lewis KEY
Chair and CEO · 10b5-1
$0
4.4K sh
Own +20%
-
Exercise·M
William Lewis KEY
Chair and CEO · 10b5-1
$0
6.3K sh
Own +20%
-
Sell·S
William Lewis KEY
Chair and CEO · 10b5-1
$120.3K
825 sh · $145.79
Own -0%
-
Sell·S
William Lewis KEY
Chair and CEO · 10b5-1
$326.2K
2.3K sh · $144.66
Own -1%
-
Sell·S
William Lewis KEY
Chair and CEO · 10b5-1
$772.7K
5.4K sh · $143.81
Own -2%
-
Sell·S
William Lewis KEY
Chair and CEO · 10b5-1
$321.2K
2.2K sh · $142.99
Own -1%
-
Exercise·M
William Lewis KEY
Chair and CEO · 10b5-1
$76.2K
4.4K sh · $17.16
Own +1%
-
Exercise·M
William Lewis KEY
Chair and CEO · 10b5-1
$190.6K
6.3K sh · $30.46
Own +2%
-
Exercise·M
William Lewis KEY
Chair and CEO · 10b5-1
$0
4.4K sh
Own +17%
-
Exercise·M
William Lewis KEY
Chair and CEO · 10b5-1
$0
6.3K sh
Own +17%
-
Sell·S
William Lewis KEY
Chair and CEO · 10b5-1
$235.2K
1.4K sh · $164.01
Own -0%
-
Sell·S
William Lewis KEY
Chair and CEO · 10b5-1
$1.4M
8.5K sh · $163.23
Own -3%
-
Sell·S
William Lewis KEY
Chair and CEO · 10b5-1
$127.3K
787 sh · $161.73
Own -0%
-
Exercise·M
William Lewis KEY
Chair and CEO · 10b5-1
$76.2K
4.4K sh · $17.16
Own +1%
-
Exercise·M
William Lewis KEY
Chair and CEO · 10b5-1
$190.6K
6.3K sh · $30.46
Own +2%
-
Exercise·M
Chief Operating Officer · 10b5-1
$0
88.1K sh
Own New
-
Sell·S
Chief Operating Officer · 10b5-1
$10.3M
62.3K sh · $164.95
Own -37%
-
Sell·S
Chief Operating Officer · 10b5-1
$3.1M
19.0K sh · $164.11
Own -10%
-
Sell·S
Chief Operating Officer · 10b5-1
$1.1M
6.7K sh · $163.18
Own -3%
-
Exercise·M
Chief Operating Officer · 10b5-1
$1.3M
88.1K sh · $14.56
Own +82%
-
Exercise·M
Chief Legal Officer · 10b5-1
$0
14.0K sh
Own +306%
-
Exercise·M
Chief Legal Officer · 10b5-1
$0
5.6K sh
Own +189%
-
Sell·S
Chief Legal Officer · 10b5-1
$3.0M
19.6K sh · $150.98
Own -27%
-
Exercise·M
Chief Legal Officer · 10b5-1
$390.2K
14.0K sh · $27.89
Own +24%
-
Exercise·M
Chief Legal Officer · 10b5-1
$96.4K
5.6K sh · $17.07
Own +11%
| Date▾ | Insider | Type | Shares | Value |
|---|---|---|---|---|
| Jun 11, 2026 | Sara Bonstein | Grant A | 5.0K | $0 |
| Jun 11, 2026 | Roger Adsett | Grant A | 14.6K | $0 |
| Jun 11, 2026 | Roger Adsett | Grant A | 3.6K | $0 |
| Jun 8, 2026 | William Lewis KEY 10b5-1 | Sell S | 6.5K | $612.6K |
| Jun 5, 2026 | Martina Flammer M.D. 10b5-1 | Sell S | 1.9K | $192.8K |
| Jun 3, 2026 | Michael Alexander Smith | Sell S | 2.2K | $220.8K |
| Jun 3, 2026 | William Lewis KEY | Sell S | 7.6K | $777.8K |
| Jun 3, 2026 | Martina Flammer M.D. 10b5-1 | Sell S | 2.6K | $262.4K |
| Jun 3, 2026 | Sara Bonstein KEY | Sell S | 2.4K | $245.9K |
| Jun 3, 2026 | Roger Adsett | Sell S | 2.4K | $242.4K |
| May 22, 2026 | Michael Alexander Smith 10b5-1 | Sell S | 6.1K | $667.0K |
| May 18, 2026 | William Lewis KEY 10b5-1 | Exercise M | 4.4K | $0 |
| May 18, 2026 | William Lewis KEY 10b5-1 | Exercise M | 6.3K | $0 |
| May 18, 2026 | William Lewis KEY 10b5-1 | Sell S | 8.0K | $853.1K |
| May 18, 2026 | William Lewis KEY 10b5-1 | Sell S | 11.8K | $1.3M |
| May 18, 2026 | William Lewis KEY 10b5-1 | Sell S | 5.8K | $605.9K |
| May 18, 2026 | William Lewis KEY 10b5-1 | Exercise M | 4.4K | $76.2K |
| May 18, 2026 | William Lewis KEY 10b5-1 | Exercise M | 6.3K | $190.6K |
| May 14, 2026 | Martina Flammer M.D. 10b5-1 | Sell S | 10.5K | $1.2M |
| May 13, 2026 | Michael Alexander Smith | Sell S | 4.1K | $477.4K |
| May 13, 2026 | Leo Lee | Grant A | 3.3K | — |
| May 13, 2026 | William Lewis KEY | Sell S | 13.3K | $1.5M |
| May 13, 2026 | Carol Schafer | Grant A | 3.3K | — |
| May 13, 2026 | Melvin Sharoky MD | Grant A | 3.3K | — |
| May 13, 2026 | Martina Flammer M.D. 10b5-1 | Sell S | 3.4K | $393.2K |
| May 13, 2026 | Martina Flammer M.D. 10b5-1 | Sell S | 4.5K | $504.0K |
| May 13, 2026 | Clarissa Desjardins | Grant A | 3.3K | — |
| May 13, 2026 | David R Brennan | Grant A | 3.3K | — |
| May 13, 2026 | Sara Bonstein KEY | Sell S | 8.3K | $961.0K |
| May 13, 2026 | Roger Adsett | Sell S | 5.8K | $678.1K |
| May 11, 2026 | Martina Flammer M.D. 10b5-1 | Exercise M | 12.9K | $0 |
| May 11, 2026 | Martina Flammer M.D. 10b5-1 | Sell S | 830 | $84.0K |
| May 11, 2026 | Martina Flammer M.D. 10b5-1 | Sell S | 12.1K | $1.2M |
| May 11, 2026 | Martina Flammer M.D. 10b5-1 | Exercise M | 12.9K | $221.0K |
| May 4, 2026 | William Lewis KEY 10b5-1 | Exercise M | 4.4K | $0 |
| May 4, 2026 | William Lewis KEY 10b5-1 | Exercise M | 6.3K | $0 |
| May 4, 2026 | William Lewis KEY 10b5-1 | Sell S | 381 | $53.2K |
| May 4, 2026 | William Lewis KEY 10b5-1 | Sell S | 1.2K | $173.4K |
| May 4, 2026 | William Lewis KEY 10b5-1 | Sell S | 2.7K | $375.1K |
| May 4, 2026 | William Lewis KEY 10b5-1 | Sell S | 5.3K | $728.6K |
| May 4, 2026 | William Lewis KEY 10b5-1 | Sell S | 599 | $81.0K |
| May 4, 2026 | William Lewis KEY 10b5-1 | Sell S | 433 | $58.1K |
| May 4, 2026 | William Lewis KEY 10b5-1 | Exercise M | 4.4K | $76.2K |
| May 4, 2026 | William Lewis KEY 10b5-1 | Exercise M | 6.3K | $190.6K |
| Apr 16, 2026 | William Lewis KEY 10b5-1 | Exercise M | 4.4K | $0 |
| Apr 16, 2026 | William Lewis KEY 10b5-1 | Exercise M | 6.3K | $0 |
| Apr 16, 2026 | William Lewis KEY 10b5-1 | Sell S | 825 | $120.3K |
| Apr 16, 2026 | William Lewis KEY 10b5-1 | Sell S | 2.3K | $326.2K |
| Apr 16, 2026 | William Lewis KEY 10b5-1 | Sell S | 5.4K | $772.7K |
| Apr 16, 2026 | William Lewis KEY 10b5-1 | Sell S | 2.2K | $321.2K |
| Apr 16, 2026 | William Lewis KEY 10b5-1 | Exercise M | 4.4K | $76.2K |
| Apr 16, 2026 | William Lewis KEY 10b5-1 | Exercise M | 6.3K | $190.6K |
| Apr 6, 2026 | William Lewis KEY 10b5-1 | Exercise M | 4.4K | $0 |
| Apr 6, 2026 | William Lewis KEY 10b5-1 | Exercise M | 6.3K | $0 |
| Apr 6, 2026 | William Lewis KEY 10b5-1 | Sell S | 1.4K | $235.2K |
| Apr 6, 2026 | William Lewis KEY 10b5-1 | Sell S | 8.5K | $1.4M |
| Apr 6, 2026 | William Lewis KEY 10b5-1 | Sell S | 787 | $127.3K |
| Apr 6, 2026 | William Lewis KEY 10b5-1 | Exercise M | 4.4K | $76.2K |
| Apr 6, 2026 | William Lewis KEY 10b5-1 | Exercise M | 6.3K | $190.6K |
| Apr 1, 2026 | Roger Adsett 10b5-1 | Exercise M | 88.1K | $0 |
| Apr 1, 2026 | Roger Adsett 10b5-1 | Sell S | 62.3K | $10.3M |
| Apr 1, 2026 | Roger Adsett 10b5-1 | Sell S | 19.0K | $3.1M |
| Apr 1, 2026 | Roger Adsett 10b5-1 | Sell S | 6.7K | $1.1M |
| Apr 1, 2026 | Roger Adsett 10b5-1 | Exercise M | 88.1K | $1.3M |
| Mar 30, 2026 | Michael Alexander Smith 10b5-1 | Exercise M | 14.0K | $0 |
| Mar 30, 2026 | Michael Alexander Smith 10b5-1 | Exercise M | 5.6K | $0 |
| Mar 30, 2026 | Michael Alexander Smith 10b5-1 | Sell S | 19.6K | $3.0M |
| Mar 30, 2026 | Michael Alexander Smith 10b5-1 | Exercise M | 14.0K | $390.2K |
| Mar 30, 2026 | Michael Alexander Smith 10b5-1 | Exercise M | 5.6K | $96.4K |
About INSM insider trading
This page tracks insider transactions for INSMED Inc (INSM) reported to the U.S. Securities and Exchange Commission on Form 4. Corporate insiders — directors, executive officers and beneficial owners of more than 10% of the stock — must disclose their trades within two business days. Open-market purchases (code P) and sales (code S) made at the insider's discretion are the most-watched opportunistic signals, while awards (A), option exercises (M) and tax-withholding (F) reflect compensation rather than conviction. Trades marked 10b5-1 were made under a pre-arranged plan and are considered routine. A cluster buy — several insiders buying within a short window — is historically a stronger bullish indicator than any single trade.