AMPHASTAR PHARMACEUTICALS IN (AMPH) Stock Ownership
NASDAQ:AMPH • US03209R1032
27.67 USD
+0.12 (+0.44%)
At close: Feb 24, 2026
27.67 USD
0 (0%)
After Hours: 2/24/2026, 5:20:00 PM
| Shares Outstanding | 45.95M |
| Float | 34.79M |
| Float Short Interest Percentage | 11.05% |
| Owners (insider) | 9.38% |
| Owners (institutional) | 74.02% |
| Owners (insider) change | -0.09% |
| Owners (institutional) change | -0.87% |
| Date | Name | Type | Shares | Price | Amount |
|---|---|---|---|---|---|
| Dec 17, 2025 | Zhou Rong | Option Excercise | 9787 | 11.33 | $ 110,886.71 |
| Dec 17, 2025 | Zhou Rong | Open Market Sale | 9787 | 26.20 | $ 256,379.27 |
| Dec 11, 2025 | Petersen Floyd F. | Open Market Sale | 4163 | 25.82 | $ 107,508.28 |
| Nov 25, 2025 | PRINS RICHARD K | Option Excercise | 4179 | 16.69 | $ 69,747.51 |
| Nov 25, 2025 | PRINS RICHARD K | Open Market Sale | 4179 | 27.10 | $ 113,253.41 |
| Nov 13, 2025 | Petersen Floyd F. | Option Excercise | 16679 | 16.69 | $ 278,372.51 |
| Nov 13, 2025 | Petersen Floyd F. | Open Market Sale | 16679 | 26.49 | $ 441,836.72 |
| Nov 3, 2025 | Petersen Floyd F. | Open Market Sale | 500 | 25.27 | $ 12,633.10 |
| Oct 1, 2025 | Petersen Floyd F. | Open Market Sale | 500 | 27.20 | $ 13,602.40 |
| Sep 2, 2025 | Petersen Floyd F. | Open Market Sale | 500 | 30.98 | $ 15,491.65 |
| Aug 1, 2025 | Petersen Floyd F. | Open Market Sale | 500 | 20.83 | $ 10,415.75 |
| Jul 18, 2025 | Gaugh David Russell | Grant | 6304 | 0.00 | $ 0.00 |
| Jul 2, 2025 | Petersen Floyd F. | Open Market Sale | 500 | 23.47 | $ 11,733.95 |
| Jun 13, 2025 | Zhang Jack Y. | Option Excercise | 200000 | 13.03 | $ 2,606,000.00 |
| Jun 13, 2025 | Luo Mary Z. | Option Excercise | 200000 | 13.03 | $ 2,606,000.00 |
| Jun 3, 2025 | Lee Howard | Option Excercise | 923 | 26.01 | $ 24,007.23 |
| Jun 2, 2025 | Lee Howard | Grant | 5122 | 0.00 | $ 0.00 |
| Jun 2, 2025 | Gerst Diane G. | Grant | 5122 | 0.00 | $ 0.00 |
| Jun 2, 2025 | Deflin Gayle | Grant | 5122 | 0.00 | $ 0.00 |
| May 19, 2025 | PETERS WILLIAM J | Option Excercise | 273 | 24.79 | $ 6,767.67 |
| May 1, 2025 | Petersen Floyd F. | Open Market Sale | 500 | 24.08 | $ 12,041.45 |
| Mar 15, 2025 | Liawatidewi Yakob | Option Excercise | 2762 | 27.31 | $ 75,417.85 |
| Mar 15, 2025 | PETERS WILLIAM J | Option Excercise | 4972 | 27.28 | $ 135,647.64 |
| Mar 15, 2025 | Zhou Rong | Option Excercise | 3189 | 27.30 | $ 87,044.75 |
| Mar 14, 2025 | Zhang Jack Y. | Option Excercise | 501690 | 14.69 | $ 7,369,826.10 |
| Mar 14, 2025 | Luo Mary Z. | Option Excercise | 501690 | 14.69 | $ 7,369,826.10 |
| Mar 14, 2025 | Zhang Jack Y. | Option Excercise | 426195 | 26.72 | $ 11,386,432.89 |
| Mar 14, 2025 | Luo Mary Z. | Option Excercise | 426195 | 26.72 | $ 11,386,432.89 |
| Mar 10, 2025 | Zhang Jack Y. | Grant | 165222 | 0.00 | $ 0.00 |
| Mar 10, 2025 | Luo Mary Z. | Grant | 165222 | 0.00 | $ 0.00 |
| Mar 10, 2025 | Liawatidewi Yakob | Grant | 20837 | 0.00 | $ 0.00 |
| Mar 10, 2025 | PETERS WILLIAM J | Grant | 36747 | 0.00 | $ 0.00 |
| Mar 10, 2025 | Zhou Rong | Grant | 24692 | 0.00 | $ 0.00 |
| Mar 6, 2025 | Petersen Floyd F. | Open Market Sale | 1000 | 27.99 | $ 27,986.30 |
| Mar 6, 2025 | Liawatidewi Yakob | Option Excercise | 1141 | 28.32 | $ 32,313.12 |
| Mar 6, 2025 | Zhang Jack Y. | Option Excercise | 12714 | 28.32 | $ 360,060.48 |
| Mar 6, 2025 | Luo Mary Z. | Option Excercise | 12714 | 28.32 | $ 360,060.48 |
| Mar 6, 2025 | PETERS WILLIAM J | Option Excercise | 2141 | 28.32 | $ 60,633.12 |
| Mar 6, 2025 | Zhou Rong | Option Excercise | 1354 | 28.32 | $ 38,345.28 |
| Mar 4, 2025 | Zhou Rong | Option Excercise | 1121 | 27.62 | $ 30,962.02 |
| Mar 4, 2025 | Liawatidewi Yakob | Option Excercise | 963 | 27.62 | $ 26,598.06 |
| Mar 4, 2025 | Zhang Jack Y. | Option Excercise | 8179 | 27.62 | $ 225,903.98 |
| Mar 4, 2025 | Luo Mary Z. | Option Excercise | 8179 | 27.62 | $ 225,903.98 |
| Mar 4, 2025 | PETERS WILLIAM J | Option Excercise | 7490 | 13.35 | $ 99,991.50 |
| Mar 4, 2025 | PETERS WILLIAM J | Open Market Sale | 4231 | 27.54 | $ 116,515.39 |
| Mar 4, 2025 | PETERS WILLIAM J | Option Excercise | 1739 | 27.62 | $ 48,031.18 |