William Lewis insider trades: INSMED (INSM) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where William reports to the SEC
Open-market buys and sales
75 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Jul 23, 2026 | INSM | ↓ Sell | 10,700 | $106.06 | $1.1M | Direct | Jul 24, 2026 (1d) |
| Jul 9, 2026 | INSM | ↓ Sell | 10,699 | $117.40 | $1.3M | Direct | Jul 10, 2026 (1d) |
| Jun 8, 2026 | INSM | ↓ Sell | 6,515 | $94.03 | $613K | Direct | Jun 10, 2026 (2d) |
| May 18, 2026 | INSM | ↓ Sell | 25,564 | $106.33 | $2.7M | Direct | May 20, 2026 (2d) |
| May 13, 2026 | INSM | ↓ Sell | 13,283 | $116.18 | $1.5M | Direct | May 15, 2026 (2d) |
| May 4, 2026 | INSM | ↓ Sell | 10,699 | $137.34 | $1.5M | Direct | May 6, 2026 (2d) |
| Apr 16, 2026 | INSM | ↓ Sell | 10,699 | $143.97 | $1.5M | Direct | Apr 17, 2026 (1d) |
| Apr 6, 2026 | INSM | ↓ Sell | 10,699 | $163.22 | $1.7M | Direct | Apr 8, 2026 (2d) |
| Mar 19, 2026 | INSM | ↓ Sell | 10,699 | $143.52 | $1.5M | Direct | Mar 20, 2026 (1d) |
| Mar 5, 2026 | INSM | ↓ Sell | 10,699 | $146.03 | $1.6M | Direct | Mar 5, 2026 (0d) |
| Feb 19, 2026 | INSM | ↓ Sell | 10,699 | $150.97 | $1.6M | Direct | Feb 23, 2026 (4d) |
| Feb 3, 2026 | INSM | ↓ Sell | 3,009 | $156.34 | $470K | Direct | Feb 4, 2026 (1d) |
| Jan 20, 2026 | INSM | ↓ Sell | 10,699 | $158.93 | $1.7M | Direct | Jan 22, 2026 (2d) |
| Jan 12, 2026 | INSM | ↓ Sell | 19,215 | $169.00 | $3.2M | Direct | Jan 13, 2026 (1d) |
| Jan 8, 2026 | INSM | ↓ Sell | 9,676 | $174.03 | $1.7M | Direct | Jan 8, 2026 (0d) |
| Dec 18, 2025 | INSM | ↓ Sell | 10,699 | $166.97 | $1.8M | Direct | Dec 19, 2025 (1d) |
| Dec 4, 2025 | INSM | ↓ Sell | 10,699 | $205.62 | $2.2M | Direct | Dec 5, 2025 (1d) |
| Aug 18, 2025 | INSM | ↓ Sell | 6,865 | $128.40 | $881K | By the Katie Procter Dynasty Trust | Aug 20, 2025 (2d) |
| Aug 4, 2025 | INSM | ↓ Sell | 6,830 | $109.81 | $750K | By the Katie Procter Dynasty Trust | Aug 6, 2025 (2d) |
| Jul 15, 2025 | INSM | ↓ Sell | 6,830 | $102.37 | $699K | By the Katie Procter Dynasty Trust | Jul 15, 2025 (0d) |
| Jul 1, 2025 | INSM | ↓ Sell | 6,830 | $98.33 | $672K | By the Katie Procter Dynasty Trust | Jul 2, 2025 (1d) |
| Jun 16, 2025 | INSM | ↓ Sell | 129,805 | $100.39 | $13.0M | By the Katie Procter Dynasty Trust | Jun 18, 2025 (2d) |
| Jun 16, 2025 | INSM | ↓ Sell | 5,204 | $100.32 | $522K | Direct | Jun 18, 2025 (2d) |
| Jun 3, 2025 | INSM | ↓ Sell | 5,472 | $71.50 | $391K | Direct | Jun 4, 2025 (1d) |
| Jun 2, 2025 | INSM | ↓ Sell | 6,830 | $71.31 | $487K | By the Katie Procter Dynasty Trust | Jun 4, 2025 (2d) |
| May 20, 2025 | INSM | ↓ Sell | 21,057 | $67.65 | $1.4M | Direct | May 22, 2025 (2d) |
| May 20, 2025 | INSM | ↓ Sell | 6,830 | $67.72 | $463K | By the Katie Procter Dynasty Trust | May 22, 2025 (2d) |
| May 14, 2025 | INSM | ↓ Sell | 21,213 | $66.73 | $1.4M | Direct | May 15, 2025 (1d) |
| May 1, 2025 | INSM | ↓ Sell | 6,830 | $72.57 | $496K | By the Katie Procter Dynasty Trust | May 2, 2025 (1d) |
| Apr 15, 2025 | INSM | ↓ Sell | 6,830 | $70.16 | $479K | By the Katie Procter Dynasty Trust | Apr 16, 2025 (1d) |
| Apr 1, 2025 | INSM | ↓ Sell | 6,830 | $73.58 | $503K | By the Katie Procter Dynasty Trust | Apr 3, 2025 (2d) |
| Mar 17, 2025 | INSM | ↓ Sell | 18,750 | $77.03 | $1.4M | Direct | Mar 19, 2025 (2d) |
| Mar 17, 2025 | INSM | ↓ Sell | 6,830 | $77.04 | $526K | By the Katie Procter Dynasty Trust | Mar 19, 2025 (2d) |
| Mar 3, 2025 | INSM | ↓ Sell | 18,750 | $77.79 | $1.5M | Direct | Mar 5, 2025 (2d) |
| Mar 3, 2025 | INSM | ↓ Sell | 6,830 | $77.79 | $531K | By the Katie Procter Dynasty Trust | Mar 5, 2025 (2d) |
| Feb 18, 2025 | INSM | ↓ Sell | 18,750 | $81.03 | $1.5M | Direct | Feb 20, 2025 (2d) |
| Feb 18, 2025 | INSM | ↓ Sell | 6,830 | $81.03 | $553K | By the Katie Procter Dynasty Trust | Feb 20, 2025 (2d) |
| Feb 6, 2025 | INSM | ↓ Sell | 79,350 | $80.90 | $6.4M | Direct | Feb 7, 2025 (1d) |
| Feb 3, 2025 | INSM | ↓ Sell | 18,750 | $77.94 | $1.5M | Direct | Feb 5, 2025 (2d) |
| Feb 3, 2025 | INSM | ↓ Sell | 6,830 | $77.94 | $532K | By the Katie Procter Dynasty Trust | Feb 5, 2025 (2d) |
| Jan 15, 2025 | INSM | ↓ Sell | 31,805 | $70.18 | $2.2M | Direct | Jan 16, 2025 (1d) |
| Jan 15, 2025 | INSM | ↓ Sell | 6,830 | $70.17 | $479K | By the Katie Procter Dynasty Trust | Jan 16, 2025 (1d) |
| Jan 10, 2025 | INSM | ↓ Sell | 15,195 | $65.48 | $995K | Direct | Jan 10, 2025 (0d) |
| Jan 2, 2025 | INSM | ↓ Sell | 18,750 | $69.84 | $1.3M | Direct | Jan 3, 2025 (1d) |
| Jan 2, 2025 | INSM | ↓ Sell | 6,830 | $69.86 | $477K | By the Katie Procter Dynasty Trust | Jan 3, 2025 (1d) |
| Dec 19, 2024 | INSM | ↓ Sell | 18,750 | $69.91 | $1.3M | Direct | Dec 20, 2024 (1d) |
| Dec 19, 2024 | INSM | ↓ Sell | 6,830 | $69.92 | $478K | By the Katie Procter Dynasty Trust | Dec 20, 2024 (1d) |
| Dec 12, 2024 | INSM | ↓ Sell | 18,750 | $72.97 | $1.4M | Direct | Dec 13, 2024 (1d) |
| Dec 12, 2024 | INSM | ↓ Sell | 6,830 | $72.98 | $498K | By the Katie Procter Dynasty Trust | Dec 13, 2024 (1d) |
| May 14, 2024 | INSM | ↓ Sell | 22,198 | $25.52 | $566K | Direct | May 15, 2024 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other INSM insiders
Open-market trades in the last 12 months
About William Lewis's insider trades
William Lewis is Chair and CEO at INSMED (INSM). Since Dec 3, 2012, William has reported 7 open-market purchases worth $1.3M and 68 sales worth $116.6M on SEC Form 4. In the last 12 months: 17 sales ($27.8M).
Their filings also include option exercises (44 filings), grants and awards (32 filings), shares withheld for taxes (3 filings), other transactions (1 filing). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every INSM insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.