SEC Form 4Coverage since Aug 12, 2025Open-market trades only
$INSM insider trading
Over the last 12 months, INSMED insiders reported no purchases and 53 sales totaling $166.1M across SEC Form 4 filings. 62% of those filings were made under pre-arranged 10b5-1 trading plans.
- Bought · 12m
- — 0 events
- Sold · 12m
- $166.1M 53 events
- Events · 12m
- 53 Form 4 filings, grouped
- Insiders · 12m
- 9 distinct reporters
- 10b5-1 share
- 62% of events, not dollars
Side
Price · $INSM · 3Mvia TradingView
Top insiders · 12m
Lewis WilliamChair and CEO18× · $28.5M
Flammer Martina M.D.Chief Medical Officer11× · $19.9M
Smith Michael AlexanderChief Legal Officer7× · $12.9M
Adsett RogerChief Operating Officer5× · $47.6M
Bonstein SaraChief Financial Officer3× · $1.2M
All insider trades
50 of 60 events
Scroll the table sideways for price, value and marks.
| Date | Insider | Type | Shares | Avg price | Value | Δ stake | Marks |
|---|---|---|---|---|---|---|---|
| Aug 17, 2026 | SHAROKY MELVIN MDD | ▼ Sale | 5,000 | $127.53 | $638K | -100% | indirect |
| Aug 10, 2026 | Adsett RogerChief Operating Officer · O | ▼ Sale | 239,850 | $133.27 | $32.0M | -70.8% | — |
| Aug 6, 2026 | Flammer Martina M.D.Chief Medical Officer · O | ▼ Sale | 27,173 | $128.61 | $3.5M | -31% | plan · 2 tranches |
| Jul 23, 2026 | Lewis WilliamChair and CEO · O·D | ▼ Sale | 10,700 | $106.06 | $1.1M | -4% | plan · 2 tranches |
| Jul 9, 2026 | Lewis WilliamChair and CEO · O·D | ▼ Sale | 10,699 | $117.4 | $1.3M | -4% | plan · 3 tranches |
| Jul 6, 2026 | Flammer Martina M.D.Chief Medical Officer · O | ▼ Sale | 12,302 | $109.98 | $1.4M | -16.9% | plan · 2 tranches |
| Jun 25, 2026 | Lewis WilliamChair and CEO · O·D | ▼ Sale | 21,398 | $103.32 | $2.2M | -7.6% | plan · 5 tranches |
| Jun 22, 2026 | Smith Michael AlexanderChief Legal Officer · O | ▼ Sale | 1,806 | $95.82 | $173K | -4.6% | plan |
| Jun 8, 2026 | Lewis WilliamChair and CEO · O·D | ▼ Sale | 6,515 | $94.03 | $613K | -2.5% | plan |
| Jun 5, 2026 | Flammer Martina M.D.Chief Medical Officer · O | ▼ Sale | 1,858 | $103.78 | $193K | -3% | plan |
| Jun 3, 2026 | Adsett RogerChief Operating Officer · O | ▼ Sale | 2,370 | $102.27 | $242K | -2.3% | — |
| Jun 3, 2026 | Bonstein SaraChief Financial Officer · O | ▼ Sale | 2,404 | $102.27 | $246K | -3.4% | — |
| Jun 3, 2026 | Smith Michael AlexanderChief Legal Officer · O | ▼ Sale | 2,159 | $102.27 | $221K | -5.2% | — |
| Jun 3, 2026 | Lewis WilliamChair and CEO · O·D | ▼ Sale | 7,605 | $102.27 | $778K | -2.8% | — |
| Jun 3, 2026 | Flammer Martina M.D.Chief Medical Officer · O | ▼ Sale | 2,566 | $102.27 | $262K | -4% | plan |
| May 4, 2026 | Lewis WilliamChair and CEO · O·D | ▼ Sale | 10,699 | $137.34 | $1.5M | -3.4% | plan · 6 tranches |
| Apr 16, 2026 | Lewis WilliamChair and CEO · O·D | ▼ Sale | 10,699 | $143.97 | $1.5M | -3.4% | plan · 4 tranches |
| Apr 6, 2026 | Lewis WilliamChair and CEO · O·D | ▼ Sale | 10,699 | $163.22 | $1.7M | -3.4% | plan · 3 tranches |
| Apr 1, 2026 | Adsett RogerChief Operating Officer · O | ▼ Sale | 88,060 | $164.63 | $14.5M | -45.2% | plan · 3 tranches |
| Mar 30, 2026 | Smith Michael AlexanderChief Legal Officer · O | ▼ Sale | 19,638 | $150.98 | $3.0M | -27.5% | plan |
| Mar 19, 2026 | Lewis WilliamChair and CEO · O·D | ▼ Sale | 10,699 | $143.52 | $1.5M | -3.4% | plan · 3 tranches |
| Mar 5, 2026 | Lewis WilliamChair and CEO · O·D | ▼ Sale | 10,699 | $146.03 | $1.6M | -3.4% | plan · 4 tranches |
| Feb 24, 2026 | Smith Michael AlexanderChief Legal Officer · O | ▼ Sale | 24,774 | $155.77 | $3.9M | -32.3% | plan · 3 tranches |
| Feb 19, 2026 | Lewis WilliamChair and CEO · O·D | ▼ Sale | 10,699 | $150.97 | $1.6M | -3.4% | plan · 5 tranches |
| Feb 9, 2026 | Lewis WilliamChair and CEO · O·D | ▼ Sale | 13,396 | $147.79 | $2.0M | -4.3% | plan · 3 tranches |
| Feb 5, 2026 | Flammer Martina M.D.Chief Medical Officer · O | ▼ Sale | 869 | $152.44 | $132K | -1% | plan |
| Feb 3, 2026 | Smith Michael AlexanderChief Legal Officer · O | ▼ Sale | 640 | $156.27 | $100K | -1.1% | — |
| Feb 3, 2026 | Flammer Martina M.D.Chief Medical Officer · O | ▼ Sale | 8,777 | $154.7 | $1.4M | -9.4% | plan · 6 tranches |
| Feb 3, 2026 | Adsett RogerChief Operating Officer · O | ▼ Sale | 791 | $156.17 | $124K | -0.7% | — |
| Feb 3, 2026 | Bonstein SaraChief Financial Officer · O | ▼ Sale | 748 | $156.34 | $117K | -0.9% | — |
| Feb 3, 2026 | Lewis WilliamChair and CEO · O·D | ▼ Sale | 3,009 | $156.34 | $470K | -1% | — |
| Jan 20, 2026 | Lewis WilliamChair and CEO · O·D | ▼ Sale | 10,699 | $158.93 | $1.7M | -3.4% | plan · 5 tranches |
| Jan 12, 2026 | Lewis WilliamChair and CEO · O·D | ▼ Sale | 19,215 | $169 | $3.2M | -5.9% | plan · 7 tranches |
| Jan 9, 2026 | Flammer Martina M.D.Chief Medical Officer · O | ▼ Sale | 1,887 | $186.19 | $351K | -2.2% | plan |
| Jan 8, 2026 | Smith Michael AlexanderChief Legal Officer · O | ▼ Sale | 3,158 | $174 | $549K | -5.2% | 3 tranches |
| Jan 8, 2026 | Flammer Martina M.D.Chief Medical Officer · O | ▼ Sale | 16,530 | $174.06 | $2.9M | -16% | plan · 7 tranches |
| Jan 8, 2026 | Adsett RogerChief Operating Officer · O | ▼ Sale | 4,290 | $174.06 | $747K | -3.8% | 3 tranches |
| Jan 8, 2026 | Bonstein SaraChief Financial Officer · O | ▼ Sale | 4,642 | $174.22 | $809K | -5.5% | 3 tranches |
| Jan 8, 2026 | Lewis WilliamChair and CEO · O·D | ▼ Sale | 9,676 | $174.03 | $1.7M | -3% | 3 tranches |
| Jan 5, 2026 | Flammer Martina M.D.Chief Medical Officer · O | ▼ Sale | 12,303 | $171.38 | $2.1M | -11.5% | plan · 7 tranches |
| Jan 2, 2026 | Schaeffer Orlov S NicoleChief People Strategy Officer · O | ▼ Sale | 87,290 | $175.2 | $15.3M | -67.6% | plan · 5 tranches |
| Dec 18, 2025 | Lewis WilliamChair and CEO · O·D | ▼ Sale | 10,699 | $166.97 | $1.8M | -3.4% | plan · 10 tranches |
| Dec 5, 2025 | SHAROKY MELVIN MDD | ▼ Sale | 20,000 | $205.01 | $4.1M | -7.6% | — |
| Dec 4, 2025 | Lewis WilliamChair and CEO · O·D | ▼ Sale | 10,699 | $205.62 | $2.2M | -3.4% | plan · 4 tranches |
| Dec 1, 2025 | Flammer Martina M.D.Chief Medical Officer · O | ▼ Sale | 8,895 | $206.98 | $1.8M | -9.7% | plan · 3 tranches |
| Nov 24, 2025 | ANDERSON ELIZABETH MD | ▼ Sale | 5,000 | $204.58 | $1.0M | -7.8% | — |
| Nov 17, 2025 | LEE LEOD | ▼ Sale | 75,000 | $195.9 | $14.7M | -57.8% | 5 tranches |
| Nov 14, 2025 | ANDERSON ELIZABETH MD | ▼ Sale | 10,000 | $195.87 | $2.0M | -13.6% | — |
| Nov 12, 2025 | Schaeffer Orlov S NicoleChief People Strategy Officer · O | ▼ Sale | 30,000 | $194 | $5.8M | -45.1% | 4 tranches |
| Nov 11, 2025 | Flammer Martina M.D.Chief Medical Officer · O | ▼ Sale | 31,226 | $189.68 | $5.9M | -27.3% | plan · 4 tranches |
Every $INSM filing on this page is one API call away
The same Form 4 data over REST or MCP, already grouped into events with the plan flag and the dollar value read. A free key does 100 calls a day and needs no card. Prefer email? INSMED filings can reach your inbox instead.
About Form 4
Corporate insiders — officers, directors and 10%+ owners — must report their trades to the SEC on Form 4 within two business days. This page shows open-market activity: purchases (code P), sales (S) and dispositions back to the issuer (D). Scheduled compensation events such as stock grants and option exercises are also filed on Form 4 but carry no trading signal, so they are not shown and counts here can be lower than the raw EDGAR filing total. We group each filing's transactions into one economic event (a laddered 10b5-1 sale is one event, not 25 rows), flag pre-arranged plans and late filings, and link every event to its AI-scored article in the $INSM feed.