William J. Peters
CFO, EVP & TREASURER at Amphastar Pharmaceuticals Inc.
Sits on 1 board. Last updated September 27, 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 |
|---|---|---|---|---|---|
| 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 |
| Mar 10, 2025 | Amphastar Pharmaceuticals Inc. | Grant or award | +36,747 | — | — |
| Mar 6, 2025 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −2,141 | $28.32 | $60,633 |
| Mar 4, 2025 | Amphastar Pharmaceuticals Inc. | Option exercise | +7,490 | $13.35 | $99,992 |
| Mar 4, 2025 | Amphastar Pharmaceuticals Inc. | Open-market sale | −4,231 | $27.54 | $116,522 |
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