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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
DEFA14ADEFA14AApr 13, 2026DEFA14ADEFA14AApr 14, 2025DEFA14ADEFA14AApr 19, 2024DEFA14ADEFA14AApr 12, 2024DEFA14ADEFA14AApr 14, 2023DEFA14ADEFA14AApr 14, 2022DEFA14ADEFA14AMay 7, 2021DEFA14ADEFA14AApr 14, 2021DEFA14ADEFA14AApr 15, 2020DEFA14ADEFA14AApr 18, 2019DEFA14ADEFA14AMar 15, 2019DEFA14ADEFA14AApr 18, 2018DEFA14ADEFA14AApr 21, 2017DEFA14ADEFA14AApr 22, 2016DEFA14ADEFINITIVE ADDITIONAL MATERIALSApr 8, 2015
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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