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 | |
|
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 | |
12/05/2023 5:25 PM | Amphastar Pharmaceuticals (Issuer) Zhou Rong (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
12/04/2023 7:49 PM | Amphastar Pharmaceuticals (Issuer) Petersen Floyd F. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
12/01/2023 3:11 PM | Amphastar Pharmaceuticals (Subject) Petersen Floyd F. (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
11/20/2023 4:23 PM | Amphastar Pharmaceuticals (Issuer) PRINS RICHARD K (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
11/17/2023 11:34 AM | Amphastar Pharmaceuticals (Subject) Zhou Rong (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
11/15/2023 3:30 PM | Amphastar Pharmaceuticals (Issuer) Deflin Gayle (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
11/15/2023 3:31 PM | Amphastar Pharmaceuticals (Issuer) PRINS RICHARD K (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
11/13/2023 11:38 AM | Amphastar Pharmaceuticals (Subject) PRINS RICHARD K (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
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11/13/2023 11:38 AM | Amphastar Pharmaceuticals (Subject) Deflin Gayle (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
11/02/2023 7:37 PM | Amphastar Pharmaceuticals (Issuer) Petersen Floyd F. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
10/03/2023 5:38 PM | Amphastar Pharmaceuticals (Issuer) Petersen Floyd F. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
10/02/2023 3:01 PM | Amphastar Pharmaceuticals (Subject) Petersen Floyd F. (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
09/15/2023 3:11 PM | Amphastar Pharmaceuticals (Filer)
| Form 8-K Current report pursuant to Section 13 or 15(d) | |
08/29/2023 5:54 PM | Amphastar Pharmaceuticals (Issuer) Liawatidewi Yakob (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
08/16/2023 7:22 PM | Amphastar Pharmaceuticals (Issuer) PRINS RICHARD K (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
08/16/2023 7:23 PM | Amphastar Pharmaceuticals (Issuer) ZASLOFF MICHAEL A (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
08/16/2023 4:24 PM | Amphastar Pharmaceuticals (Filer)
| Form 8-K/A | |
08/15/2023 1:14 PM | Amphastar Pharmaceuticals (Subject) PRINS RICHARD K (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
08/15/2023 11:54 AM | Amphastar Pharmaceuticals (Subject) ZASLOFF MICHAEL A (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |
06/30/2023 3:21 PM | Amphastar Pharmaceuticals (Filer)
| Form 8-K Current report pursuant to Section 13 or 15(d) | |
06/21/2023 4:05 PM | Amphastar Pharmaceuticals (Issuer) Zhou Rong (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/20/2023 3:05 PM | Amphastar Pharmaceuticals (Issuer) Zhou Rong (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/14/2023 4:36 PM | Amphastar Pharmaceuticals (Issuer) Zhou Rong (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/07/2023 7:12 PM | Amphastar Pharmaceuticals (Issuer) Petersen Floyd F. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/07/2023 7:13 PM | Amphastar Pharmaceuticals (Issuer) PRINS RICHARD K (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/07/2023 5:24 PM | Amphastar Pharmaceuticals (Issuer) Gerst Diane G. (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/07/2023 4:18 PM | Amphastar Pharmaceuticals (Issuer) Deflin Gayle (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/07/2023 4:19 PM | Amphastar Pharmaceuticals (Issuer) Lee Howard (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/07/2023 4:20 PM | Amphastar Pharmaceuticals (Issuer) ZASLOFF MICHAEL A (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/06/2023 5:49 PM | Amphastar Pharmaceuticals (Issuer) Liawatidewi Yakob (Reporting)
| Form 4 Statement of changes in beneficial ownership of securities | |
06/01/2023 11:27 AM | Amphastar Pharmaceuticals (Subject) Lee Howard (Reporting)
| Form 144 Notice of proposed sale of securities pursuant to Rule 144 | |