| Filed | Form | Description | |
|---|---|---|---|
| 4/14/25 | DEFA14A | DEFA14A | → |
| 4/14/25 | DEF 14A | DEF 14A | → |
| 4/2/25 | PRE 14A | PRE 14A | → |
| 4/19/24 | DEFA14A | DEFA14A | → |
| 4/12/24 | DEFA14A | DEFA14A | → |
| 4/12/24 | DEF 14A | DEF 14A | → |
| ↓ | |||
| Filed | Form | Description | |
|---|---|---|---|
| 3/6/26 | 4 | 4 | → |
| 3/6/26 | 4 | 4 | → |
| 3/6/26 | 4 | 4 | → |
| 3/6/26 | 4 | OWNERSHIP DOCUMENT | → |
| 12/18/25 | 4 | 4 | → |
| 12/15/25 | 4 | 4 | → |
| ↓ | |||
Amphastar Pharmaceuticals is a publicly traded American speciality pharmaceutical company. It was incorporated in May 2004 and primarily develops, manufactures, and sells inhalation and intranasal products.