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 | |
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 | |
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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 | |
05/22/2023
5:49 PM | Amphastar Pharmaceuticals (Issuer)
PETERS WILLIAM J (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
05/19/2023
5:30 PM | Amphastar Pharmaceuticals (Issuer)
Deflin Gayle (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
05/19/2023
5:36 PM | Amphastar Pharmaceuticals (Issuer)
Zhou Rong (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
05/18/2023
2:37 PM | Amphastar Pharmaceuticals (Subject)
PETERS WILLIAM J (Reporting)
| Form 144
Notice of proposed sale of securities pursuant to Rule 144 | |
05/17/2023
2:28 PM | Amphastar Pharmaceuticals (Subject)
Petersen Floyd F. (Reporting)
| Form 144
Notice of proposed sale of securities pursuant to Rule 144 | |
05/17/2023
11:46 AM | Amphastar Pharmaceuticals (Subject)
Zhou Rong (Reporting)
| Form 144
Notice of proposed sale of securities pursuant to Rule 144 | |
05/16/2023
6:59 PM | Amphastar Pharmaceuticals (Issuer)
PRINS RICHARD K (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
05/16/2023
7:01 PM | Amphastar Pharmaceuticals (Issuer)
ZASLOFF MICHAEL A (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
05/15/2023
12:39 PM | Amphastar Pharmaceuticals (Subject)
ZASLOFF MICHAEL A (Reporting)
| Form 144
Notice of proposed sale of securities pursuant to Rule 144 | |
05/12/2023
10:22 AM | Amphastar Pharmaceuticals (Subject)
PRINS RICHARD K (Reporting)
| Form 144
Notice of proposed sale of securities pursuant to Rule 144 | |
04/24/2023
6:17 AM | Amphastar Pharmaceuticals (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
04/18/2023
7:07 PM | Amphastar Pharmaceuticals (Issuer)
PETERS WILLIAM J (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
