Constantin Ionel Stefan sold $50k of AMPX
Chief Technology Officer at Amprius Technologies, Inc.. 20,366 shares at an average of $2.43, traded May 21, 2025, filed May 23, 2025.
Score components
- +15RoleOfficer
- +7Trade size$50k at market
- 0Share of holdings soldSold 2.3% of holdings
- +15Cluster3 insiders selling within 14 days
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 +41.7%, 3m +164.6%, 6m +273.1%.
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 0001940928-25-000009, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| May 21, 2025 | SOpen-market sale Common stock | -20,366 | $2.43 | $50k | 866,134 | May 23, 2025 |
Related signals
Other insiders at Amprius Technologies, Inc. and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 50Moderate | Amprius Technologies, Inc. | Kang Sun See Remarks | $642k 62,101 shares | -5% | |
| 44Moderate | Amprius Technologies, Inc. | Constantin Ionel Stefan Chief Technology Officer | $307k 29,681 shares | -4% | |
| 54Moderate | Amprius Technologies, Inc. | Thomas M Stepien Chief Executive Officer | $324k 31,529 shares | -5% | |
| 53Moderate | Amprius Technologies, Inc. | Donald R Dixon director | $1.5M 85,000 shares | -19% | |
| 52Moderate | Amprius Technologies, Inc. | Donald R Dixon director | $765k 40,000 shares | -8% | |
| 46Moderate | Amprius Technologies, Inc. | Thomas M Stepien Chief Executive Officer | $42k 2,000 shares | -0% | |
| 44Moderate | Amprius Technologies, Inc. | Donald R Dixon director | $320k 17,895 shares | -4% | |
| 30Weak | Amprius Technologies, Inc. | Kang Sun See Remarks | $6,121 356 shares | -0% | |
| 37Weak | Amprius Technologies, Inc. | Constantin Ionel Stefan Chief Technology Officer | $55k 3,208 shares | -0% | |
| 48Moderate | Amprius Technologies, Inc. | Thomas M Stepien Chief Executive Officer | $75k 4,375 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.