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 | |
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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 | |
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 | |
06/28/2024 3:26 PM | Amphastar Pharmaceuticals (Issuer) PETERS WILLIAM J (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/27/2024 3:25 PM | Amphastar Pharmaceuticals (Subject) PETERS WILLIAM J (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
06/11/2024 5:35 PM | Amphastar Pharmaceuticals (Issuer) Luo Mary Z. (Reporting) Zhang Jack Y. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/11/2024 5:32 PM | Amphastar Pharmaceuticals (Issuer) Petersen Floyd F. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/10/2024 3:51 PM | Amphastar Pharmaceuticals (Subject) Petersen Floyd F. (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
06/05/2024 7:10 PM | Amphastar Pharmaceuticals (Issuer) Lee Howard (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/05/2024 5:54 PM | Amphastar Pharmaceuticals (Issuer) Petersen Floyd F. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/05/2024 5:56 PM | Amphastar Pharmaceuticals (Issuer) Deflin Gayle (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/05/2024 6:03 PM | Amphastar Pharmaceuticals (Issuer) Gerst Diane G. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/05/2024 4:56 PM | Amphastar Pharmaceuticals (Issuer) ZASLOFF MICHAEL A (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/05/2024 4:58 PM | Amphastar Pharmaceuticals (Issuer) PRINS RICHARD K (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/05/2024 5:00 PM | Amphastar Pharmaceuticals (Issuer) Liawatidewi Yakob (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/04/2024 3:14 PM | Amphastar Pharmaceuticals (Filer)
| Form 8-K Current report pursuant to Section 13 or 15(d) | |
05/21/2024 5:26 PM | Amphastar Pharmaceuticals (Issuer) PETERS WILLIAM J (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
05/02/2024 3:56 PM | Amphastar Pharmaceuticals (Issuer) Petersen Floyd F. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
04/19/2024 3:21 PM | Amphastar Pharmaceuticals (Filer)
| Form DEFA14A | |
04/12/2024 3:08 PM | Amphastar Pharmaceuticals (Filer)
| Form DEF 14A | |
04/12/2024 3:08 PM | Amphastar Pharmaceuticals (Filer)
| Form DEF 14A | |
04/12/2024 3:14 PM | Amphastar Pharmaceuticals (Filer)
| Form DEFA14A | |
04/12/2024 3:14 PM | Amphastar Pharmaceuticals (Filer)
| Form DEFA14A | |
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04/02/2024 8:31 PM | Amphastar Pharmaceuticals (Issuer) Petersen Floyd F. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/19/2024 5:55 PM | Amphastar Pharmaceuticals (Issuer) Luo Mary Z. (Reporting) Zhang Jack Y. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/08/2024 3:47 PM | Amphastar Pharmaceuticals (Issuer) Zhou Rong (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/08/2024 3:49 PM | Amphastar Pharmaceuticals (Issuer) Liawatidewi Yakob (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/08/2024 3:52 PM | Amphastar Pharmaceuticals (Issuer) PETERS WILLIAM J (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/08/2024 3:32 PM | Amphastar Pharmaceuticals (Issuer) Luo Mary Z. (Reporting) Zhang Jack Y. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/06/2024 4:54 PM | Amphastar Pharmaceuticals (Issuer) Liawatidewi Yakob (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/06/2024 4:57 PM | Amphastar Pharmaceuticals (Issuer) ZASLOFF MICHAEL A (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/06/2024 5:29 PM | Amphastar Pharmaceuticals (Issuer) Luo Mary Z. (Reporting) Zhang Jack Y. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/06/2024 4:49 PM | Amphastar Pharmaceuticals (Issuer) PETERS WILLIAM J (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/06/2024 4:51 PM | Amphastar Pharmaceuticals (Issuer) Zhou Rong (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
03/06/2024 9:23 AM | Amphastar Pharmaceuticals (Subject) FEDERATED HERMES, INC. (Filed by) FEDERATED HERMES, INC. (Filed by)
| Form SC 13G/A | |
03/05/2024 12:21 PM | Amphastar Pharmaceuticals (Subject) ZASLOFF MICHAEL A (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
03/04/2024 7:35 PM | Amphastar Pharmaceuticals (Issuer) Petersen Floyd F. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
02/29/2024 3:53 PM | Amphastar Pharmaceuticals (Filer)
| Form S-8 Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans | |
02/28/2024 3:38 PM | Amphastar Pharmaceuticals (Filer)
| Form 8-K Current report pursuant to Section 13 or 15(d) | |
02/09/2024 4:21 PM | Amphastar Pharmaceuticals (Subject) Zhang Jack Y. (Filed by)
| Form SC 13G/A | |
02/02/2024 6:37 PM | Amphastar Pharmaceuticals (Issuer) Petersen Floyd F. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
01/23/2024 10:53 AM | Amphastar Pharmaceuticals (Subject) BlackRock Inc. (Filed by)
| Form SC 13G/A | |
01/17/2024 1:36 PM | Amphastar Pharmaceuticals (Subject) FEDERATED HERMES, INC. (Filed by) FEDERATED HERMES, INC. (Filed by)
| Form SC 13G/A | |
01/11/2024 3:37 PM | Amphastar Pharmaceuticals (Issuer) Luo Mary Z. (Reporting) Zhang Jack Y. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
01/10/2024 5:27 PM | Amphastar Pharmaceuticals (Issuer) Luo Mary Z. (Reporting) Zhang Jack Y. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
01/10/2024 3:25 PM | Amphastar Pharmaceuticals (Subject) Luo Mary Z. (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
01/09/2024 3:22 PM | Amphastar Pharmaceuticals (Subject) Luo Mary Z. (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
01/08/2024 3:23 PM | Amphastar Pharmaceuticals (Subject) Luo Mary Z. (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
01/03/2024 6:25 PM | Amphastar Pharmaceuticals (Issuer) Petersen Floyd F. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |