SEC Form 4Coverage since Jun 3, 2026
$INSM insider trading
Over the last 12 months, INSMED insiders reported no purchases and 13 sales totaling $12.2M across SEC Form 4 filings. 69% of the activity was filed under pre-arranged 10b5-1 trading plans.
- Bought · 12m
- — 0 events
- Sold · 12m
- $12.2M 13 events
- Events · 12m
- 13 Form 4 filings, grouped
- Insiders · 12m
- 5 distinct reporters
- 10b5-1 share
- 69% pre-arranged plans
Side
Price · $INSM · 12Mvia TradingView
Top insiders · 12m
Lewis WilliamChair and CEO5× · $6.0M
Flammer Martina M.D.Chief Medical Officer4× · $5.3M
Smith Michael AlexanderChief Legal Officer2× · $394K
Adsett RogerChief Operating Officer1× · $242K
Bonstein SaraChief Financial Officer1× · $246K
All insider trades
13 events
| Date | Insider | Type | Shares | Avg price | Value | Δ stake | Marks |
|---|---|---|---|---|---|---|---|
| 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 |
About Form 4
Corporate insiders — officers, directors and 10%+ owners — must report their trades to the SEC on Form 4 within two business days. 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.