William Mariner Greenman
President and CEO at Cerus Corporation
Sits on 1 board. Last updated September 28, 2026
Time on boards
- Boards served
- 1
- Current seats
- 1
- Board service
- 4 years
- Director since
- 2023
4 years of board service in total across 1 board, counting each seat separately. Longest: Cerus Corporation, 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.
-
Cerus Corporation June 2, 202694.1%
-
Cerus Corporation June 7, 202391.5%
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 |
|---|---|---|---|---|---|
| Jun 30, 2026 | Cerus Corporation | Grant or award | −192,500 | — | — |
| Jun 30, 2026 | Cerus Corporation | Open-market sale | −101,919 | $2.94 | $299,642 |
| Mar 12, 2026 | Cerus Corporation | Open-market sale | −447,757 | $1.66 | $743,277 |
| Mar 6, 2026 | Cerus Corporation | Open-market sale | −78,187 | $2.01 | $157,156 |
| Mar 5, 2026 | Cerus Corporation | Grant or award | +193,270 | — | — |
| Mar 2, 2026 | Cerus Corporation | Grant or award | +1,200,000 | — | — |
| Mar 14, 2025 | Cerus Corporation | Open-market sale | −122,827 | $1.45 | $178,099 |
| Mar 13, 2025 | Cerus Corporation | Open-market sale | −71,086 | $1.45 | $103,075 |
| Mar 7, 2025 | Cerus Corporation | Open-market sale | −60,984 | $1.50 | $91,476 |
| Mar 6, 2025 | Cerus Corporation | Grant or award | +975,000 | — | — |
| Mar 6, 2025 | Cerus Corporation | Grant or award | +165,742 | — | — |
| Mar 4, 2025 | Cerus Corporation | Open-market sale | −23,023 | $1.55 | $35,686 |
| Mar 3, 2025 | Cerus Corporation | Option exercise | +57,637 | — | — |
| Mar 14, 2024 | Cerus Corporation | Open-market sale | −63,611 | $2.02 | $128,494 |
| Mar 13, 2024 | Cerus Corporation | Open-market sale | −62,315 | $2.06 | $128,369 |
Questions about William Mariner Greenman
What boards is William Mariner Greenman on?
William Mariner Greenman sits on the board of Cerus Corporation.
What company is William Mariner Greenman the CEO of?
William Mariner Greenman is President and CEO of Cerus Corporation.
How long has William Mariner Greenman served on boards?
Our records show at least 4 years of board service across 1 board, the earliest from 2023.
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