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Amphastar Pharmaceuticals (AMPH) SEC Filings & 10K Form

Amphastar Pharmaceuticals logo
$30.62 +0.36 (+1.19%)
Closing price 08/29/2025 04:00 PM Eastern
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$30.64 +0.02 (+0.08%)
As of 08/29/2025 05:31 PM Eastern
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Recent Amphastar Pharmaceuticals SEC Filings

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DateFilerForm TypeView
08/12/2025
5:10 AM		Amphastar Pharmaceuticals (Filer)
Form 8-K
Current report pursuant to Section 13 or 15(d)  
08/07/2025
3:43 PM		Amphastar Pharmaceuticals (Filer)
Form 10-Q
General form for quarterly reports under Section 13 or 15(d)  
08/04/2025
6:17 PM		Amphastar Pharmaceuticals (Issuer)
Petersen Floyd F. (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
07/03/2025
4:30 PM		Amphastar Pharmaceuticals (Issuer)
Petersen Floyd F. (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
06/16/2025
4:19 PM		Amphastar Pharmaceuticals (Issuer)
Luo Mary Z. (Reporting)
Zhang Jack Y. (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
06/04/2025
7:04 PM		Amphastar Pharmaceuticals (Issuer)
Lee Howard (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
06/04/2025
6:45 PM		Amphastar Pharmaceuticals (Issuer)
Deflin Gayle (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
06/04/2025
6:02 PM		Amphastar Pharmaceuticals (Issuer)
Gerst Diane G. (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
06/04/2025
5:30 PM		Amphastar Pharmaceuticals (Issuer)
ZASLOFF MICHAEL A (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
06/04/2025
5:39 PM		Amphastar Pharmaceuticals (Issuer)
Petersen Floyd F. (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
06/04/2025
5:40 PM		Amphastar Pharmaceuticals (Issuer)
PRINS RICHARD K (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
05/07/2025
3:23 PM		Amphastar Pharmaceuticals (Filer)
Form 8-K
Current report pursuant to Section 13 or 15(d)  
05/02/2025
7:27 PM		Amphastar Pharmaceuticals (Issuer)
Petersen Floyd F. (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
04/14/2025
3:07 PM		Amphastar Pharmaceuticals (Filer)
Form DEF 14A
04/14/2025
3:11 PM		Amphastar Pharmaceuticals (Filer)
Form DEFA14A
04/14/2025
3:18 PM		Amphastar Pharmaceuticals (Filer)
Form ARS
04/02/2025
5:45 PM		Amphastar Pharmaceuticals (Issuer)
Petersen Floyd F. (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
03/18/2025
6:43 PM		Amphastar Pharmaceuticals (Issuer)
Zhou Rong (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
03/18/2025
6:13 PM		Amphastar Pharmaceuticals (Issuer)
Luo Mary Z. (Reporting)
Zhang Jack Y. (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
03/18/2025
5:38 PM		Amphastar Pharmaceuticals (Issuer)
PETERS WILLIAM J (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
03/18/2025
5:41 PM		Amphastar Pharmaceuticals (Issuer)
Liawatidewi Yakob (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
03/12/2025
3:53 PM		Amphastar Pharmaceuticals (Issuer)
Zhou Rong (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
03/12/2025
3:14 PM		Amphastar Pharmaceuticals (Issuer)
PETERS WILLIAM J (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
03/12/2025
3:16 PM		Amphastar Pharmaceuticals (Issuer)
Liawatidewi Yakob (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
03/10/2025
5:10 PM		Amphastar Pharmaceuticals (Issuer)
Zhou Rong (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
03/10/2025
4:29 PM		Amphastar Pharmaceuticals (Issuer)
PETERS WILLIAM J (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
03/06/2025
4:00 PM		Amphastar Pharmaceuticals (Issuer)
PETERS WILLIAM J (Reporting)
Form 4
Statement of changes in beneficial ownership of securities  
02/27/2025
3:33 PM		Amphastar Pharmaceuticals (Filer)
Form 8-K
Current report pursuant to Section 13 or 15(d)  
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  
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  
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08/30/2024
3:14 PM		Amphastar Pharmaceuticals (Filer)
Form 8-K
Current report pursuant to Section 13 or 15(d)  
(Data available from 1/1/2016 forward)


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This page (NASDAQ:AMPH) was last updated on 8/30/2025 by MarketBeat.com Staff
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