Amphastar Pharmaceuticals, Inc (AMPH) insider trading
Every open-market stock purchase and sale by Amphastar Pharmaceuticals, Inc executives, directors, large shareholders and members of Congress, from SEC Form 4 filings. Sector: Other.
Insider activity at a glance
- Rong Zhou (Vice president) and 2 others sold $764K in the last 90 days.
- Last company insider buy: David Maris (Board member), $20.3K, 6 years ago.
Last 12 months: insiders bought $0 (0 buys) and sold $1.7M (10 sales). Last close $27.72 on Oct 30, 2026.
Recent AMPH insider trades
| Date | Insider | Trade | Value |
|---|---|---|---|
| Sep 21, 2026 | William J Peters (CFO) | Sold | $103K |
| Sep 16, 2026 | Rong Zhou (VP) | Sold | $239K |
| Sep 16, 2026 | Rong Zhou (VP) | Bought (not open market) | — |
| Sep 2, 2026 | Rong Zhou (VP) | Sold | $75.3K |
| Aug 11, 2026 | Richard K Prins (Insider) | Sold | $162K |
| Aug 7, 2026 | William J Peters (CFO) | Sold | $184K |
| Aug 7, 2026 | William J Peters (CFO) | Bought (not open market) | — |
| Jul 9, 2026 | Anthony T Pierce (Insider) | Bought (not open market) | — |
| Jul 9, 2026 | Anthony T Pierce (Insider) | Bought (not open market) | — |
| Jun 2, 2026 | Howard Lee (Insider) | Sold (not open market) | $14.2K |
| Jun 1, 2026 | Gayle Deflin (Insider) | Bought (not open market) | — |
| Jun 1, 2026 | Diane G. Gerst (Insider) | Bought (not open market) | — |
| Jun 1, 2026 | Richard K Prins (Insider) | Bought (not open market) | — |
| Jun 1, 2026 | Howard Lee (Insider) | Bought (not open market) | — |
| Jun 1, 2026 | David Russell Gaugh (Insider) | Bought (not open market) | — |
| Jun 1, 2026 | Gayle Deflin (Insider) | Bought (not open market) | — |
| Jun 1, 2026 | Howard Lee (Insider) | Bought (not open market) | — |
| Jun 1, 2026 | Diane G. Gerst (Insider) | Bought (not open market) | — |
| Jun 1, 2026 | Richard K Prins (Insider) | Bought (not open market) | — |
| Jun 1, 2026 | Michael A Zasloff (Insider) | Bought (not open market) | — |
| Jun 1, 2026 | Michael A Zasloff (Insider) | Bought (not open market) | — |
| Jun 1, 2026 | David Russell Gaugh (Insider) | Bought (not open market) | — |
| Mar 15, 2026 | Mary Z. Luo (COO) | Sold (not open market) | $178K |
| Mar 15, 2026 | Mary Z. Luo (COO) | Sold (not open market) | $52.9K |
| Mar 15, 2026 | William J Peters (CFO) | Sold (not open market) | $35.9K |
Who's trading AMPH
- William J Peters, CFO: sold $287K (2 sales), last Sep 21, 2026
- Rong Zhou, VP: sold $571K (3 sales), last Sep 16, 2026
- Richard K Prins, Insider: sold $275K (2 sales), last Aug 11, 2026
- Anthony T Pierce, Insider: other filings, last Jul 9, 2026
- Howard Lee, Insider: other filings, last Jun 2, 2026
- Gayle Deflin, Insider: other filings, last Jun 1, 2026
- David Russell Gaugh, Insider: other filings, last Jun 1, 2026
- Michael A Zasloff, Insider: other filings, last Jun 1, 2026
- Diane G. Gerst, Insider: other filings, last Jun 1, 2026
- Yakob Liawatidewi, VP: other filings, last Mar 15, 2026
- Mary Z. Luo, COO: other filings, last Mar 15, 2026
- Jack Y. Zhang, CEO: other filings, last Mar 4, 2026
- Floyd F. Petersen, Insider: sold $562K (4 sales), last Dec 12, 2025
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