Rong Zhou sold $256k of AMPH
SENIOR EVP, PRODUCTION CENTER at Amphastar Pharmaceuticals, Inc.. 9,787 shares at an average of $26.20, traded Dec 17, 2025, filed Dec 18, 2025.
Score components
- +15RoleOfficer
- +13Trade size$256k at market
- 0Share of holdings soldSold 6.6% of holdings
- +8Cluster2 insiders selling within 14 days
- -15Exercise and sellShares came from an option exercise in the same filing
What happened after comparable sells
Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.
This signal so far: 1m -1.6%, 3m -26.3%, 6m -29.0%.
Price around the trade, and since
From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™
Rows in this filing
Every transaction in Form 4 0001645326-25-000004, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Dec 17, 2025 | MOption exercise Common Stock | +9,787 | $11.33 | $111k | 147,830 | Dec 18, 2025 |
| Dec 17, 2025 | SOpen-market sale Common Stock | -9,787 | $26.20 | $256k | 138,043 | Dec 18, 2025 |
| Dec 17, 2025 | MOption exercise Employee Stock Option (right to buy)derivative | -9,787 | $0.00 | $0 | 0 | Dec 18, 2025 |
Related signals
Other insiders at Amphastar Pharmaceuticals, Inc. and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 20Weak | Amphastar Pharmaceuticals, Inc. | William J Peters CFO, EVP & TREASURER | $103k 4,139 shares | -2% | |
| 21Weak | Amphastar Pharmaceuticals, Inc. | Rong Zhou SENIOR EVP, PRODUCTION CENTER | $239k 10,000 shares | -6% | |
| 23Weak | AMPHsell Amphastar Pharmaceuticals, Inc. | Rong Zhou SENIOR EVP, PRODUCTION CENTER | $75k 3,187 shares | -2% | |
| 39Weak | Amphastar Pharmaceuticals, Inc. | Richard K Prins director | $162k 7,973 shares | -21% | |
| 7Weak | Amphastar Pharmaceuticals, Inc. | William J Peters CFO, EVP & TREASURER | $184k 8,180 shares | -5% | |
| 33Weak | Amphastar Pharmaceuticals, Inc. | Floyd F. Petersen director | $108k 4,163 shares | -6% | |
| 23Weak | Amphastar Pharmaceuticals, Inc. | Richard K Prins director | $113k 4,179 shares | -11% | |
| 30Weak | Amphastar Pharmaceuticals, Inc. | Floyd F. Petersen director | $442k 16,679 shares | -18% | |
| 0Weak | Amphastar Pharmaceuticals, Inc. | Floyd F. Petersen director | $13k 500 shares | -1% | |
| 0Weak | Amphastar Pharmaceuticals, Inc. | Floyd F. Petersen director | $14k 500 shares | -1% |
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.