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 | |
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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 | |
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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) | |
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