07/03/2025 4:30 PM | Amphastar Pharmaceuticals (Issuer) Petersen Floyd F. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/16/2025 4:19 PM | Amphastar Pharmaceuticals (Issuer) Luo Mary Z. (Reporting) Zhang Jack Y. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/04/2025 7:04 PM | Amphastar Pharmaceuticals (Issuer) Lee Howard (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/04/2025 6:45 PM | Amphastar Pharmaceuticals (Issuer) Deflin Gayle (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/04/2025 6:02 PM | Amphastar Pharmaceuticals (Issuer) Gerst Diane G. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/04/2025 5:30 PM | Amphastar Pharmaceuticals (Issuer) ZASLOFF MICHAEL A (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/04/2025 5:39 PM | Amphastar Pharmaceuticals (Issuer) Petersen Floyd F. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/04/2025 5:40 PM | Amphastar Pharmaceuticals (Issuer) PRINS RICHARD K (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
05/07/2025 3:23 PM | Amphastar Pharmaceuticals (Filer)
| Form 8-K Current report pursuant to Section 13 or 15(d) | |
05/02/2025 7:27 PM | Amphastar Pharmaceuticals (Issuer) Petersen Floyd F. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
04/14/2025 3:07 PM | Amphastar Pharmaceuticals (Filer)
| Form DEF 14A | |
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04/14/2025 3:11 PM | Amphastar Pharmaceuticals (Filer)
| Form DEFA14A | |
04/14/2025 3:18 PM | Amphastar Pharmaceuticals (Filer)
| Form ARS | |
04/02/2025 5:45 PM | Amphastar Pharmaceuticals (Issuer) Petersen Floyd F. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/18/2025 6:43 PM | Amphastar Pharmaceuticals (Issuer) Zhou Rong (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/18/2025 6:13 PM | Amphastar Pharmaceuticals (Issuer) Luo Mary Z. (Reporting) Zhang Jack Y. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/18/2025 5:38 PM | Amphastar Pharmaceuticals (Issuer) PETERS WILLIAM J (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/18/2025 5:41 PM | Amphastar Pharmaceuticals (Issuer) Liawatidewi Yakob (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/12/2025 3:53 PM | Amphastar Pharmaceuticals (Issuer) Zhou Rong (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/12/2025 3:14 PM | Amphastar Pharmaceuticals (Issuer) PETERS WILLIAM J (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/12/2025 3:16 PM | Amphastar Pharmaceuticals (Issuer) Liawatidewi Yakob (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/10/2025 5:10 PM | Amphastar Pharmaceuticals (Issuer) Zhou Rong (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/10/2025 4:29 PM | Amphastar Pharmaceuticals (Issuer) PETERS WILLIAM J (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/06/2025 4:00 PM | Amphastar Pharmaceuticals (Issuer) PETERS WILLIAM J (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
02/27/2025 3:33 PM | Amphastar Pharmaceuticals (Filer)
| Form 8-K Current report pursuant to Section 13 or 15(d) | |
02/07/2025 6:21 PM | Amphastar Pharmaceuticals (Subject) Zhang Jack Y. (Filed by)
| Form SCHEDULE 13G/A | |
12/16/2024 4:22 PM | Amphastar Pharmaceuticals (Issuer) Zhou Rong (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
12/11/2024 7:28 PM | Amphastar Pharmaceuticals (Issuer) PRINS RICHARD K (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
12/09/2024 10:37 AM | Amphastar Pharmaceuticals (Subject) PRINS RICHARD K (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
11/13/2024 7:26 PM | Amphastar Pharmaceuticals (Issuer) Zhou Rong (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
11/13/2024 5:55 PM | Amphastar Pharmaceuticals (Issuer) PRINS RICHARD K (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
11/12/2024 7:05 PM | Amphastar Pharmaceuticals (Issuer) Luo Mary Z. (Reporting) Zhang Jack Y. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
11/12/2024 12:29 PM | Amphastar Pharmaceuticals (Subject) PRINS RICHARD K (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
11/12/2024 12:29 PM | Amphastar Pharmaceuticals (Subject) Zhou Rong (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
11/08/2024 6:02 PM | Amphastar Pharmaceuticals (Issuer) Liawatidewi Yakob (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
09/16/2024 6:09 PM | Amphastar Pharmaceuticals (Issuer) Luo Mary Z. (Reporting) Zhang Jack Y. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
09/06/2024 6:48 PM | Amphastar Pharmaceuticals (Issuer) Petersen Floyd F. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
09/05/2024 3:48 PM | Amphastar Pharmaceuticals (Subject) Petersen Floyd F. (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
08/30/2024 3:14 PM | Amphastar Pharmaceuticals (Filer)
| Form 8-K Current report pursuant to Section 13 or 15(d) | |
08/27/2024 8:33 PM | Amphastar Pharmaceuticals (Issuer) Zhou Rong (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
08/26/2024 4:26 PM | Amphastar Pharmaceuticals (Subject) Zhou Rong (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
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08/13/2024 4:58 PM | Amphastar Pharmaceuticals (Issuer) PRINS RICHARD K (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
08/12/2024 4:25 PM | Amphastar Pharmaceuticals (Subject) PRINS RICHARD K (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
08/09/2024 3:15 PM | Amphastar Pharmaceuticals (Filer)
| Form 10-Q General form for quarterly reports under Section 13 or 15(d) | |
08/07/2024 3:22 PM | Amphastar Pharmaceuticals (Filer)
| Form 8-K Current report pursuant to Section 13 or 15(d) | |
08/02/2024 3:32 PM | Amphastar Pharmaceuticals (Issuer) PETERS WILLIAM J (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
07/31/2024 4:24 PM | Amphastar Pharmaceuticals (Subject) PETERS WILLIAM J (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |