William Lewis
Chair and CEO at Insmed Incorporated
Sits on 2 boards. Last updated September 28, 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.
-
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 |
Questions about William Lewis
What boards is William Lewis on?
William Lewis sits on the boards of Insmed Incorporated and NewAmsterdam Pharma Company N.V.
What company is William Lewis the CEO of?
William Lewis is Chair and CEO of Insmed Incorporated.
How long has William Lewis served on boards?
Our records show at least 7 years of board service across 2 boards, the earliest from 2023.
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