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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
S-1/AS-1/AJun 18, 2014S-1/AS-1/AJun 13, 2014S-1/AS-1/AJun 5, 2014S-1/AS-1/AApr 3, 2006S-1/AS-1/ANov 23, 2005S-1/AS-1/AOct 27, 2005S-1/AS-1/AAug 15, 2005S-1/AS-1/AJul 1, 2005S-1/AS-1/AJun 23, 2005S-1/AS-1/AMay 13, 2005
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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