William Lewis
Chair and CEO at Insmed Incorporated
Sits on 2 boards. Last updated September 27, 2026
Time on boards
- Boards served
- 2
- Current seats
- 2
- Board service
- 7 years
- Director since
- 2023
7 years of board service in total across 2 boards, counting each seat separately. Longest: Insmed Incorporated, 3 years.
Chief executive roles
Shareholder support
Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
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Insmed Incorporated May 15, 202595.5%
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Jul 23, 2026 | Insmed Incorporated | Option exercise | +6,260 | $30.46 | $190,680 |
| Jul 23, 2026 | Insmed Incorporated | Option exercise | +4,440 | $17.16 | $76,190 |
| Jul 23, 2026 | Insmed Incorporated | Open-market sale | −4,828 | $105.62 | $509,933 |
| Jul 23, 2026 | Insmed Incorporated | Open-market sale | −5,872 | $106.43 | $624,957 |
| Jul 9, 2026 | Insmed Incorporated | Option exercise | +6,259 | $30.46 | $190,649 |
| Jul 9, 2026 | Insmed Incorporated | Option exercise | +4,440 | $17.16 | $76,190 |
| Jul 9, 2026 | Insmed Incorporated | Open-market sale | −5,005 | $116.55 | $583,333 |
| Jul 9, 2026 | Insmed Incorporated | Open-market sale | −2,335 | $117.62 | $274,643 |
| Jul 9, 2026 | Insmed Incorporated | Open-market sale | −3,359 | $118.52 | $398,109 |
| Jun 25, 2026 | Insmed Incorporated | Option exercise | +12,518 | $30.46 | $381,298 |
| Jun 25, 2026 | Insmed Incorporated | Option exercise | +8,880 | $17.16 | $152,381 |
| Jun 25, 2026 | Insmed Incorporated | Open-market sale | −12,091 | $102.34 | $1,237,393 |
| Jun 25, 2026 | Insmed Incorporated | Open-market sale | −1,836 | $103.10 | $189,292 |
| Jun 25, 2026 | Insmed Incorporated | Open-market sale | −3,723 | $104.28 | $388,234 |
| Jun 25, 2026 | Insmed Incorporated | Open-market sale | −2,456 | $105.27 | $258,543 |
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