The Vanguard Group 13D and 13G filings for Amphastar Pharmaceuticals, Inc.:
- Schedule 13D must be filed within ten days after a person or an organization acquires beneficial ownership of more than 5% of a voting class of a company's equity securities.
- Shares have been adjusted for stock splits.
| Reported DateTime | Transaction Date | Type | Company Symbol | Filed By Symbol | Shares Owned % Owned | Shares Vs. Prev Report | View |
| 2024-02-13 4:58 pm Purchase | 2023-12-29 | 13G | Amphastar Pharmaceuticals, Inc. AMPH | The Vanguard Group | 2,814,710 5.880% | 192,903 (+7.36%) | Filing |
| 2023-02-09 11:07 am Purchase | 2022-12-30 | 13G | Amphastar Pharmaceuticals, Inc. AMPH | The Vanguard Group | 2,621,807 5.420% | 153,696 (+6.23%) | Filing |
| 2022-02-09 3:24 pm Sale | 2021-12-31 | 13G | Amphastar Pharmaceuticals, Inc. AMPH | The Vanguard Group | 2,468,111 5.160% | -9,916 (-0.40%) | Filing |
| 2021-02-10 10:30 am Purchase | 2020-12-31 | 13G | Amphastar Pharmaceuticals, Inc. AMPH | The Vanguard Group | 2,478,027 5.220% | 114,523 (+4.85%) | Filing |