Amphastar Pharmaceuticals, Inc. (AMPH) has 5 SEC Form 4 insider filings on record in the last 90 days. No insider purchases were filed — 3 sales totalling $521K. Most recent filing: Sept. 17, 2026.
| Date | Insider | Value | Shares | Stake | Pre-planned | Links |
|---|---|---|---|---|---|---|
| Sept. 17, 2026 filed Sept. 16, 2026 | Zhou Rong SENIOR EVP, PRODUCTION CENTER | $105,904 | 30,000 | 0% | No | |
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| Sept. 3, 2026 filed Sept. 2, 2026 | Zhou Rong SENIOR EVP, PRODUCTION CENTER | −$75,306 | 3,187 | −2% | No | |
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| Aug. 12, 2026 filed Aug. 11, 2026 | PRINS RICHARD K Director | −$161,852 | 7,973 | −21% | No | |
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| Aug. 11, 2026 filed Aug. 7, 2026 | PETERS WILLIAM J CFO, EVP & TREASURER | −$70,295 | 18,286 | −100% | Yes | |
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| July 13, 2026 filed July 9, 2026 | Pierce Anthony T Director | $0 | 24,532 | +90% | No | |
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Form 4 is the filing company officers, directors and 10% shareholders must submit to the SEC within two business days of trading their own company's stock. Open-market purchases generally carry more signal than sales, which are often scheduled in advance. More on how this works.
Real-time Telegram alerts the moment a Form 4 is filed. Filings shown here are delayed by 72 hours.
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