Stefan Constantin Ionel
SEC CIK 1940928 · EDGAR
BoughtSold
Companies
| Ticker | Company | Title | Holding | Bought | Sold | Trades | First | Last |
|---|---|---|---|---|---|---|---|---|
| AMPX | Amprius Technologies, Inc. | CTO | 771.6K | — | $11.24M | 25 | 2022-12-14 | 2026-08-21 |
Most active insiders at AMPX, 12 months
| # | Insider | Title | Bought | Sold |
|---|---|---|---|---|
| 1 | Sun Kang | Dir | — | $57.63M |
| 2 | Stefan Constantin Ionel | CTO | — | $10.69M |
| 3 | HSIEH Wen Hsuan | Dir | — | $7.62M |
| 4 | Chu Steven | Dir | — | $5.86M |
| 5 | DIXON DONALD R | Dir | — | $2.54M |
| 6 | Stepien Thomas M | Pres, Dir | — | $1.34M |
| 7 | RODRIGUEZ RICARDO C. | CFO | — | — |
| 8 | SATTERTHWAITE LIVINGSTON | Dir | — | — |
| 9 | BAYLESS KATHLEEN A | Dir | — | — |
Transactions 25
| X | Filed | Traded | Ticker | Company | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026-08-25 17:22 | 2026-08-21 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | S - Sale | $10.34 | -29.7K | 771.6K | -4% | -$306.9K | |
| 2026-05-28 18:12 | 2026-05-27 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | S - Sale | $17.19 | -3,208 | 801.3K | -0.4% | -$55.2K | |
| 2026-05-26 19:10 | 2026-05-21 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | S - Sale | $14.79 | -28.8K | 804.5K | -3% | -$426.1K | |
| 2026-03-06 | 2026-03-04 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | A - Grant | $0.00 | +110.0K | 833.3K | +15% | $0 | |
| 2026-02-24 | 2026-02-23 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | S - Sale | $10.16 | -25.4K | 723.3K | -3% | -$257.7K | |
| DM | 2026-01-30 | 2026-01-28 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | M - OptEx | $0.0513 | +39.7K | 748.8K | +6% | +$2,036 |
| D | 2026-01-30 | 2026-01-28 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | S - Sale+OE | $12.00 | -39.7K | 748.7K | -5% | -$476.3K |
| DM | 2026-01-23 | 2026-01-21+ | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | S - Sale+OE | $12.03 | -567.7K | 748.7K | -43% | -$6.83M |
| DM | 2026-01-23 | 2026-01-21+ | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | M - OptEx | $0.143 | +567.7K | 822.0K | +223% | +$81.2K |
| D | 2025-12-15 | 2025-12-11 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | M - OptEx | $0.05 | +125.0K | 947.0K | +15% | +$6,250 |
| D | 2025-12-15 | 2025-12-11 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | S - Sale+OE | $10.51 | -198.3K | 748.7K | -21% | -$2.08M |
| 2025-11-25 | 2025-11-21 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | S - Sale | $10.08 | -25.0K | 822.0K | -3% | -$252.2K | |
| 2025-08-25 | 2025-08-21 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | S - Sale | $6.82 | -19.2K | 847.0K | -2% | -$130.7K | |
| 2025-05-23 | 2025-05-21 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | S - Sale | $2.43 | -20.4K | 866.1K | -2% | -$49.5K | |
| 2025-03-21 | 2025-03-19 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | A - Grant | $0.00 | +461.5K | 886.5K | +109% | $0 | |
| D | 2025-03-18 | 2025-03-14 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | M - OptEx | $0.98 | +3,471 | 425.0K | +0.8% | +$3,402 |
| 2025-02-24 | 2025-02-21 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | S - Sale | $3.13 | -9,066 | 421.5K | -2% | -$28.4K | |
| 2024-11-22 | 2024-11-21 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | S - Sale | $1.96 | -8,575 | 430.6K | -2% | -$16.8K | |
| 2024-08-22 | 2024-08-21 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | S - Sale | $1.04 | -8,800 | 386.2K | -2% | -$9,152 | |
| M | 2024-05-24 | 2024-05-21+ | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | S - Sale | $1.34 | -9,393 | 399.1K | -2% | -$12.6K |
| 2024-03-19 | 2024-03-19 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | A - Grant | $0.00 | +374.6K | 404.4K | +1,257% | $0 | |
| M | 2023-09-18 | 2023-09-14+ | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | S - Sale | $3.76 | -80.0K | 29.8K | -73% | -$300.5K |
| D | 2023-09-12 | 2023-09-09 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | M - OptEx | $0.05 | +80.0K | 109.8K | +269% | +$4,000 |
| 2023-05-03 | 2022-12-14 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | F - Tax | $7.20 | -209 | 29.8K | -0.7% | -$1,505 | |
| D | 2022-12-15 | 2022-12-14 | AMPX | Amprius Technologies, Inc. | Stefan Constantin Ionel | CTO | M - OptEx | $0.05 | +30.0K | 30.0K | New | +$1,500 |
Purchase Sale Sale after option exercise All abbreviations