William J. Peters
CFO, EVP & Treasurer at Amphastar Pharmaceuticals Inc.
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: Amphastar Pharmaceuticals Inc., 3 years.
Shareholder support
Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
-
Amphastar Pharmaceuticals Inc. June 1, 202666.7%
-
Amphastar Pharmaceuticals Inc. June 5, 202382.2%
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 |
|---|---|---|---|---|---|
| Nov 5, 2026 | Amphastar Pharmaceuticals Inc. | Option exercise | +11,000 | $17.99 | $197,890 |
| Nov 5, 2026 | Amphastar Pharmaceuticals Inc. | Open-market sale | −12,631 | $28.99 | $366,189 |
| Nov 4, 2026 | Amphastar Pharmaceuticals Inc. | Option exercise | +16,000 | $13.03 | $208,480 |
| Nov 4, 2026 | Amphastar Pharmaceuticals Inc. | Open-market sale | −16,000 | $28.03 | $448,480 |
| Sep 21, 2026 | Amphastar Pharmaceuticals Inc. | Open-market sale | −4,139 | $25.00 | $103,475 |
| Aug 7, 2026 | Amphastar Pharmaceuticals Inc. | Option exercise | +5,053 | $19.79 | $99,999 |
| Aug 7, 2026 | Amphastar Pharmaceuticals Inc. | Open-market sale | −8,180 | $22.48 | $183,886 |
| Mar 15, 2026 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −1,973 | $18.18 | $35,869 |
| Mar 10, 2026 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −3,297 | $18.91 | $62,346 |
| Mar 9, 2026 | Amphastar Pharmaceuticals Inc. | Grant or award | +58,693 | — | — |
| Mar 6, 2026 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −2,146 | $19.34 | $41,504 |
| Mar 4, 2026 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −1,744 | $19.96 | $34,810 |
| May 19, 2025 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −273 | $24.79 | $6,768 |
| Mar 17, 2025 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −3,004 | $27.69 | $83,181 |
| Mar 15, 2025 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −1,968 | $26.66 | $52,467 |
Questions about William J. Peters
What boards is William J. Peters on?
William J. Peters sits on the board of Amphastar Pharmaceuticals Inc.
How long has William J. Peters served on boards?
Our records show at least 4 years of board service across 1 board, the earliest from 2023.
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