07/12/2019
6:05 PM | Amphastar Pharmaceuticals (Issuer)
Shandell Jason B. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities |  |
06/18/2019
8:29 PM | Amphastar Pharmaceuticals (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
06/17/2019
6:00 PM | Amphastar Pharmaceuticals (Issuer)
Zhou Rong (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
06/17/2019
5:58 PM | Amphastar Pharmaceuticals (Issuer)
Liawatidewi Yakob (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
06/13/2019
7:04 PM | Amphastar Pharmaceuticals (Issuer)
ZASLOFF MICHAEL A (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
06/13/2019
7:02 PM | Amphastar Pharmaceuticals (Issuer)
PRINS RICHARD K (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
06/13/2019
7:00 PM | Amphastar Pharmaceuticals (Issuer)
Petersen Floyd F. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
06/13/2019
6:58 PM | Amphastar Pharmaceuticals (Issuer)
Lee Howard (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
06/13/2019
6:57 PM | Amphastar Pharmaceuticals (Issuer)
Koo Richard (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
06/13/2019
6:54 PM | Amphastar Pharmaceuticals (Issuer)
Gerst Diane G. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
06/13/2019
6:51 PM | Amphastar Pharmaceuticals (Issuer)
Gerst Diane G. (Reporting)
| Form 3
Initial statement of beneficial ownership of securities | |
06/13/2019
5:38 AM | Amphastar Pharmaceuticals (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
06/10/2019
3:55 PM | Amphastar Pharmaceuticals (Issuer)
Lee Howard (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
05/07/2019
7:25 PM | Amphastar Pharmaceuticals (Issuer)
Zhou Rong (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
04/18/2019
3:15 PM | Amphastar Pharmaceuticals (Filer)
| Form DEFA14A
| |
04/18/2019
3:11 PM | Amphastar Pharmaceuticals (Filer)
| Form DEF 14A
| |
04/18/2019
3:05 PM | Amphastar Pharmaceuticals (Issuer)
Shandell Jason B. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/28/2019
3:58 PM | Amphastar Pharmaceuticals (Issuer)
Zhou Rong (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/27/2019
8:56 PM | Amphastar Pharmaceuticals (Issuer)
Liawatidewi Yakob (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/27/2019
8:54 PM | Amphastar Pharmaceuticals (Issuer)
PETERS WILLIAM J (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/27/2019
8:53 PM | Amphastar Pharmaceuticals (Issuer)
Shandell Jason B. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/19/2019
3:05 PM | Amphastar Pharmaceuticals (Issuer)
Liawatidewi Yakob (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/19/2019
5:06 AM | Amphastar Pharmaceuticals (Issuer)
PETERS WILLIAM J (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/18/2019
7:52 PM | Amphastar Pharmaceuticals (Issuer)
Zhou Rong (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/18/2019
6:56 PM | Amphastar Pharmaceuticals (Issuer)
Shandell Jason B. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/18/2019
6:53 PM | Amphastar Pharmaceuticals (Issuer)
Luo Mary Z. (Reporting)
Zhang Jack Y. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/15/2019
3:15 PM | Amphastar Pharmaceuticals (Filer)
| Form S-8
Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans | |
03/14/2019
3:58 PM | Amphastar Pharmaceuticals (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
03/06/2019
4:20 PM | Amphastar Pharmaceuticals (Issuer)
PETERS WILLIAM J (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/04/2019
7:44 PM | Amphastar Pharmaceuticals (Issuer)
Zhou Rong (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/04/2019
7:43 PM | Amphastar Pharmaceuticals (Issuer)
Zhou Rong (Reporting)
| Form 4/A
| |
03/01/2019
7:01 PM | Amphastar Pharmaceuticals (Issuer)
Shandell Jason B. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
02/15/2019
7:09 PM | Amphastar Pharmaceuticals (Issuer)
PETERS WILLIAM J (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
02/15/2019
3:56 PM | Amphastar Pharmaceuticals (Issuer)
Shandell Jason B. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
02/14/2019
5:30 PM | Amphastar Pharmaceuticals (Issuer)
Liawatidewi Yakob (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
02/13/2019
3:05 PM | Amphastar Pharmaceuticals (Subject)
Zhang Jack Y. (Filed by)
| Form SC 13G/A
| |
02/06/2019
7:12 PM | Amphastar Pharmaceuticals (Issuer)
Liawatidewi Yakob (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
01/25/2019
3:11 PM | Amphastar Pharmaceuticals (Issuer)
Shandell Jason B. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
01/24/2019
7:47 PM | Amphastar Pharmaceuticals (Issuer)
Liawatidewi Yakob (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
01/24/2019
12:46 PM | Amphastar Pharmaceuticals (Subject)
BlackRock Inc. (Filed by)
| Form SC 13G/A
| |
01/16/2019
6:10 PM | Amphastar Pharmaceuticals (Issuer)
Liawatidewi Yakob (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
01/04/2019
4:04 PM | Amphastar Pharmaceuticals (Issuer)
PETERS WILLIAM J (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/17/2018
7:05 PM | Amphastar Pharmaceuticals (Issuer)
PRINS RICHARD K (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/17/2018
7:02 PM | Amphastar Pharmaceuticals (Issuer)
Luo Mary Z. (Reporting)
Zhang Jack Y. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/13/2018
7:08 PM | Amphastar Pharmaceuticals (Issuer)
Luo Mary Z. (Reporting)
Zhang Jack Y. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/13/2018
7:05 PM | Amphastar Pharmaceuticals (Issuer)
Applied Physics & Chemistry Laboratories, Inc. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/12/2018
7:39 PM | Amphastar Pharmaceuticals (Issuer)
Koo Richard (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/12/2018
7:37 PM | Amphastar Pharmaceuticals (Issuer)
Shohet Stephen B. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/07/2018
5:36 PM | Amphastar Pharmaceuticals (Issuer)
Lee Howard (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/06/2018
2:56 PM | Amphastar Pharmaceuticals (Issuer)
Zhou Rong (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/06/2018
2:54 PM | Amphastar Pharmaceuticals (Issuer)
Shandell Jason B. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/04/2018
8:01 PM | Amphastar Pharmaceuticals (Issuer)
Petersen Floyd F. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/04/2018
8:00 PM | Amphastar Pharmaceuticals (Issuer)
PETERS WILLIAM J (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/03/2018
7:08 PM | Amphastar Pharmaceuticals (Issuer)
Liawatidewi Yakob (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
11/30/2018
3:15 PM | Amphastar Pharmaceuticals (Issuer)
PRINS RICHARD K (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
11/29/2018
5:12 PM | Amphastar Pharmaceuticals (Issuer)
Liawatidewi Yakob (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
11/26/2018
7:48 PM | Amphastar Pharmaceuticals (Issuer)
Liawatidewi Yakob (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
11/20/2018
11:15 PM | Amphastar Pharmaceuticals (Filer)
| Form EFFECT
| |
11/15/2018
6:23 PM | Amphastar Pharmaceuticals (Issuer)
ZASLOFF MICHAEL A (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
11/15/2018
6:21 PM | Amphastar Pharmaceuticals (Issuer)
PRINS RICHARD K (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
11/15/2018
6:20 PM | Amphastar Pharmaceuticals (Issuer)
Shandell Jason B. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
11/13/2018
4:10 PM | Amphastar Pharmaceuticals (Issuer)
Zhou Rong (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
11/13/2018
4:09 PM | Amphastar Pharmaceuticals (Issuer)
PETERS WILLIAM J (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
11/13/2018
4:08 PM | Amphastar Pharmaceuticals (Issuer)
Liawatidewi Yakob (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
11/09/2018
8:52 PM | Amphastar Pharmaceuticals (Issuer)
Shandell Jason B. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
11/09/2018
3:26 PM | Amphastar Pharmaceuticals (Filer)
| Form S-3
Registration statement under Securities Act of 1933 | |
11/08/2018
3:30 PM | Amphastar Pharmaceuticals (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
11/08/2018
5:03 AM | Amphastar Pharmaceuticals (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
08/15/2018
3:29 PM | Amphastar Pharmaceuticals (Issuer)
PRINS RICHARD K (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
08/08/2018
3:24 PM | Amphastar Pharmaceuticals (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
07/12/2018
4:53 PM | Amphastar Pharmaceuticals (Issuer)
Shandell Jason B. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
07/11/2018
3:03 PM | Amphastar Pharmaceuticals (Issuer)
PETERS WILLIAM J (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
07/09/2018
3:09 PM | Amphastar Pharmaceuticals (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
07/03/2018
4:06 PM | Amphastar Pharmaceuticals (Issuer)
Luo Mary Z. (Reporting)
Zhang Jack Y. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
06/18/2018
3:59 PM | Amphastar Pharmaceuticals (Issuer)
Zhou Rong (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
06/18/2018
3:57 PM | Amphastar Pharmaceuticals (Issuer)
Liawatidewi Yakob (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
06/18/2018
3:56 PM | Amphastar Pharmaceuticals (Issuer)
Liawatidewi Yakob (Reporting)
| Form 3
Initial statement of beneficial ownership of securities | |
06/13/2018
3:05 PM | Amphastar Pharmaceuticals (Issuer)
ZASLOFF MICHAEL A (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
06/11/2018
7:17 PM | Amphastar Pharmaceuticals (Issuer)
ZASLOFF MICHAEL A (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
06/11/2018
7:15 PM | Amphastar Pharmaceuticals (Issuer)
Shohet Stephen B. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
06/11/2018
7:11 PM | Amphastar Pharmaceuticals (Issuer)
PRINS RICHARD K (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
06/11/2018
7:10 PM | Amphastar Pharmaceuticals (Issuer)
Petersen Floyd F. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
06/11/2018
7:08 PM | Amphastar Pharmaceuticals (Issuer)
Lee Howard (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
06/11/2018
7:05 PM | Amphastar Pharmaceuticals (Issuer)
Koo Richard (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
06/07/2018
7:33 PM | Amphastar Pharmaceuticals (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
05/17/2018
6:05 PM | Amphastar Pharmaceuticals (Issuer)
Luo Mary Z. (Reporting)
Zhang Jack Y. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
05/09/2018
3:57 PM | Amphastar Pharmaceuticals (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
04/23/2018
4:11 PM | Amphastar Pharmaceuticals (Issuer)
PETERS WILLIAM J (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
04/18/2018
3:14 PM | Amphastar Pharmaceuticals (Filer)
| Form DEFA14A
| |
04/18/2018
3:09 PM | Amphastar Pharmaceuticals (Filer)
| Form DEF 14A
| |
03/28/2018
4:23 PM | Amphastar Pharmaceuticals (Issuer)
Zhou Rong (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/28/2018
4:22 PM | Amphastar Pharmaceuticals (Issuer)
PETERS WILLIAM J (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/28/2018
4:22 PM | Amphastar Pharmaceuticals (Issuer)
Shandell Jason B. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/28/2018
4:21 PM | Amphastar Pharmaceuticals (Issuer)
Luo Mary Z. (Reporting)
Zhang Jack Y. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/21/2018
5:15 AM | Amphastar Pharmaceuticals (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
03/20/2018
7:06 PM | Amphastar Pharmaceuticals (Issuer)
Zhou Rong (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/20/2018
7:04 PM | Amphastar Pharmaceuticals (Issuer)
PETERS WILLIAM J (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/20/2018
7:02 PM | Amphastar Pharmaceuticals (Issuer)
Shandell Jason B. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/20/2018
7:00 PM | Amphastar Pharmaceuticals (Issuer)
Luo Mary Z. (Reporting)
Zhang Jack Y. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/16/2018
5:19 PM | Amphastar Pharmaceuticals (Issuer)
PRINS RICHARD K (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
