// company-profile
INSMED Inc
INSMExchangeNasdaqSectorPharmaceutical PreparationsInc.VAFilings236Insiders15
// api This INSMED Inc insider-trading data is served live by the Form4API insider trading API. Get the same data via API.
// activity-summary
Recent insider activity is bearish. Over the last 30 days, insiders net sold $1.7M across 5 transactions.
// 90-day insight
Over the last 90 days, INSMED Inc insiders bought $0 (6 transactions) and sold $6.3M (11 transactions).
- Most active insider: Lewis William with 28 transactions totaling $9.5M.
- Largest single sale: $1.5M by Lewis William on May 13, 2026.
- 63% of recent sales were pre-scheduled 10b5-1 trades — typically less informative than open-market activity.
Activity skews bearish — sales outpace buys.
Institutional Ownership
Top 13F-HR holders of INSMED Inc as of 2026-03-31
Total reported AUM
$28.58B
QoQ change
-16.1%
Reporting period
2026-03-31
#1
Darwin Global Management, Ltd.
CIK 1839209
$2.58B
16.8M shares
#2
FMR LLC
CIK 315066
$1.71B
10.4M shares
#3
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
$1.58B
9.6M shares
Data source: SEC Form 13F-HR filings. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jun 8, 2026 | Lewis William | INSM | Sale10b5 | 6,515 | $94.03 | $613K |
| Jun 5, 2026 | Flammer Martina M.D. | INSM | Sale10b5 | 1,858 | $103.78 | $193K |
| Jun 3, 2026 | Adsett Roger | INSM | Sale | 2,370 | $102.27 | $242K |
| Jun 3, 2026 | Smith Michael Alexander | INSM | Sale | 2,159 | $102.27 | $221K |
| Jun 3, 2026 | Flammer Martina M.D. | INSM | Sale | 2,566 | $102.27 | $262K |
45 more transactions hidden
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