Stefan Constantin Ionel Insider Trading Activity
Stefan Constantin Ionel has been net-selling over the last 12 months with 0 purchases and 9 sales across 1 company.
AMPX is the most-traded position with 9 trades. The largest single transaction was a sale of AMPX for $5.9M on Jan 22, 2026.
Performance Scorecard
Forward stock performance after each transaction by Stefan Constantin Ionel. Buy returns measure price movement after open-market purchases; sell-avoided measures the loss avoided after open-market sales. Success rate counts trades where the insider's direction was right.
| PERIOD | AVG BUY RETURN | AVG SELL AVOIDED | SUCCESS RATE | TRADES |
|---|---|---|---|---|
| 30 days | — | -8.1% | 78% | 9 |
| 90 days | — | -65.7% | 0% | 8 |
| 120 days | — | -51.0% | 0% | 8 |
Performance based on stock price movement after each transaction date. Past results do not predict future returns. Not financial advice.
Price & Trades
Pro: Trade MarkersAMPX · Amprius Technologies, Inc.
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| DATE | TICKER | TYPE | SHARES | PRICE | VALUE | Δ OWNED | ROLE | FILING |
|---|---|---|---|---|---|---|---|---|
May 21, 2026 Filed 3d late | AMPX | Sell | 28,812 | $14.79 | $426K | −3.5% | CTO | |
Feb 23, 2026 | AMPX | Sell | 25,366 | $10.16 | $258K | −3.4% | CTO | |
Jan 28, 2026 | AMPX | Sell | 39,690 | $12.00 | $476K | −5.0% | CTO | |
Jan 23, 2026 | AMPX | Sell | 1,600 | $12.00 | $19K | −0.2% | CTO | |
Jan 22, 2026 | AMPX | Sell | 492,827 | $12.04 | $5.9M | −39.7% | CTO | |
Jan 21, 2026 | AMPX | Sell | 73,280 | $12.00 | $879K | −8.9% | CTO | |
Dec 11, 2025 | AMPX | Sell | 198,255 | $10.51 | $2.1M | −20.9% | CTO | |
Nov 21, 2025 | AMPX | Sell | 25,024 | $10.08 | $252K | −3.0% | CTO | |
Aug 21, 2025 | AMPX | Sell | 19,159 | $6.82 | $131K | −2.2% | CTO |
Top Companies Traded
| TICKER | COMPANY | TRADES | TOTAL VOLUME |
|---|---|---|---|
| AMPX | Amprius Technologies, Inc. | 9 | $10.5M |
Other insiders at Amprius Technologies, Inc.
2 other tracked filers at AMPX.