🕵️ Amphastar Pharmaceuticals, Inc. ($AMPH)
SEC insider & ownership activity, last 12 months · CIK 1297184 · every row links its SEC filing
Over the last 12 months insiders sold $1.4M with no open-market buying against it. Floyd Petersen sold $576K (Oct–Dec). 1 planned sale is pending, the largest $989K (Floyd Petersen). No red-flag 8-Ks in the window.
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Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 4 sellers, $1.4M (10 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Floyd Petersen | 0 | – | 5 | $576K | Dec 12, 2025 |
| Rong Zhou | 0 | – | 2 | $332K | Sep 2, 2026 |
| Richard K. Prins | 0 | – | 2 | $275K | Aug 11, 2026 |
| William J. Peters | 0 | – | 1 | $184K | Aug 7, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Jack Y. Zhang | 24.8% | 13G | Feb 7, 2025 | filing ↗ | |
| Mary Z. Luo | 24.8% | 13G | Feb 7, 2025 | filing ↗ | |
| Applied Physics & Chemistry Laboratories, Inc. | 14.2% | 13G | Feb 7, 2025 | filing ↗ | |
| BlackRock, Inc. | 11.5% | 13G | Oct 17, 2025 | filing ↗ | |
| Dimensional Fund Advisors LP | 5.2% | 13G | Jul 14, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Rong Zhou | $290K | Sep 1, 2026 | filing ↗ |
| Floyd Petersen | $989K | Aug 18, 2026 | filing ↗ |
| Richard Prins | $162K | Aug 11, 2026 | filing ↗ |
| William J. Peters | $184K | Aug 7, 2026 | filing ↗ |
| Floyd Petersen | $333K | Dec 11, 2025 | filing ↗ |
| Floyd Petersen | $43K | Dec 10, 2025 | filing ↗ |
| Rong Zhou | $500K | Nov 28, 2025 | filing ↗ |
| Richard Prins | $104K | Nov 25, 2025 | filing ↗ |
| Floyd Petersen | $442K | Nov 13, 2025 | filing ↗ |
| Floyd F. Petersen | $13K | Nov 3, 2025 | filing ↗ |
| Floyd F. Petersen | $13K | Oct 1, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Earnings (2.02) | Aug 6, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 6, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jul 9, 2026 | filing ↗ |
| Other events (8.01) | Jul 2, 2026 | filing ↗ |
| Shareholder vote (5.07) | Jun 1, 2026 | filing ↗ |
| Earnings (2.02) | May 7, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 7, 2026 | filing ↗ |
| Other events (8.01) | Mar 12, 2026 | filing ↗ |
| Officer/director changes (5.02) | Mar 3, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 3, 2026 | filing ↗ |
| Material agreement (1.01) | Mar 3, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 3, 2026 | filing ↗ |
| Earnings (2.02) | Feb 26, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 26, 2026 | filing ↗ |
| Material agreement (1.01) | Jan 6, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jan 6, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 6, 2026 | filing ↗ |
| Earnings (2.02) | Nov 6, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 6, 2025 | filing ↗ |
| Material agreement (1.01) | Oct 21, 2025 | filing ↗ |
| Material agreement (1.01) | Sep 15, 2025 | filing ↗ |