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AMPHNasdaq
Amphastar Pharmaceuticals, Inc.
Pharmaceutical Preparations · CIK 1297184
Amphastar develops, manufactures, and commercializes technically challenging generic and proprietary injectable, inhalation, and intranasal products
$886M
Market cap
$20.71
Last close
-4.9%
1D
+13.0%
5D
727K
Volume
Price · last 39 sessions-8.9%
May 4L $16.87 · H $24.03Jun 29
195
Total filings
Jun 3, 2026
Last filing
12/31
Fiscal year end
8-KShareholder VoteJun 3, 202610-Q10-QMay 7, 20268-KResults of OperationsMay 7, 2026DEFA14ADEFA14AApr 13, 2026DEF 14ADEF 14AApr 13, 20268-KCompany UpdateMar 16, 20268-KExecutive ChangeMar 6, 20268-KMaterial AgreementMar 6, 202610-K10-KFeb 26, 20268-KResults of OperationsFeb 26, 20268-KMaterial Agreement · Reg FD DisclosureJan 12, 202610-Q10-QNov 6, 20258-KResults of OperationsNov 6, 20258-KMaterial AgreementOct 24, 20258-KMaterial AgreementSep 18, 20258-KMaterial Agreement · Reg FD DisclosureAug 12, 202510-Q10-QAug 7, 20258-KResults of OperationsAug 7, 20258-KExecutive ChangeJul 21, 20258-KBylaw Amendment · Shareholder VoteJun 4, 202510-Q10-QMay 8, 20258-KResults of OperationsMay 7, 2025DEFA14ADEFA14AApr 14, 2025DEF 14ADEF 14AApr 14, 202510-K10-KMar 3, 20258-KResults of OperationsFeb 27, 202510-Q10-QNov 7, 20248-KResults of OperationsNov 6, 20248-KMaterial AgreementAug 30, 202410-Q10-QAug 9, 20248-KResults of OperationsAug 7, 20248-KExecutive Change · Shareholder VoteJun 4, 202410-Q10-QMay 10, 20248-KResults of OperationsMay 8, 2024DEFA14ADEFA14AApr 19, 2024DEFA14ADEFA14AApr 12, 2024DEF 14ADEF 14AApr 12, 202410-K10-KFeb 29, 20248-KResults of OperationsFeb 28, 202410-Q10-QNov 8, 20238-KResults of OperationsNov 8, 20238-KMaterial Agreement · New Debt / ObligationSep 15, 20238-K/ACompany UpdateAug 16, 202310-Q10-QAug 9, 20238-KResults of OperationsAug 8, 20238-KMaterial Agreement · Acquisition / DispositionJun 30, 20238-KShareholder VoteJun 6, 202310-Q10-QMay 9, 20238-KResults of OperationsMay 9, 20238-KMaterial Agreement · New Debt / ObligationApr 24, 2023DEFA14ADEFA14AApr 14, 2023DEF 14ADEF 14AApr 14, 20238-KMaterial AgreementMar 10, 202310-K10-KMar 1, 20238-KResults of OperationsFeb 28, 20238-KBylaw AmendmentFeb 24, 20238-KMaterial AgreementNov 18, 202210-Q10-QNov 8, 20228-KResults of OperationsNov 7, 20228-KExecutive ChangeAug 9, 202210-Q10-QAug 9, 20228-KResults of OperationsAug 8, 20228-KMaterial AgreementJul 8, 20228-KShareholder VoteJun 13, 202210-Q10-QMay 10, 20228-KResults of OperationsMay 9, 20228-KMaterial AgreementApr 22, 2022DEFA14ADEFA14AApr 14, 2022DEF 14ADEF 14AApr 14, 202210-K10-KMar 11, 20228-KResults of OperationsMar 10, 202210-Q10-QNov 9, 20218-KResults of OperationsNov 8, 20218-KExecutive ChangeAug 23, 20218-KExecutive Change · Material AgreementAug 20, 20218-KExecutive ChangeAug 10, 202110-Q10-QAug 9, 20218-KResults of OperationsAug 9, 20218-KMaterial Agreement · Agreement TerminatedAug 9, 20218-KShareholder VoteJun 8, 2021
Insider Activity
In the 90 days to Dec 17, 2025: 3 sold $945K.
| Date | Insider | Action | Shares | Price | Value |
|---|---|---|---|---|---|
| Dec 17, 2025 | Zhou RongSENIOR EVP, PRODUCTION CENTER | Sell | 9,787 | $26.20 | $256K |
| Dec 12, 2025 | Petersen Floyd F.Director | Sell | 2,426 | $25.92 | $63K |
| Dec 11, 2025 | Petersen Floyd F.Director | Sell | 1,737 | $25.69 | $45K |
| Nov 25, 2025 | Prins Richard KDirector | Sell | 4,179 | $27.10 | $113K |
| Nov 13, 2025 | Petersen Floyd F.Director | Sell | 16,679 | $26.49 | $442K |
| Nov 3, 2025 | Petersen Floyd F.Director | Sell | 500 | $25.27 | $13K |
| Oct 1, 2025 | Petersen Floyd F.Director | Sell | 500 | $27.20 | $14K |
Open-market buys & sells (Form 4, transaction codes P/S). Source: SEC structured insider data.
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