Amprius Technologies, Inc. (AMPX) has 61 open-market insider trades by 13 insiders since 2006. Over the last six months insiders net sold $6.3M. The most active filer is Constantin Ionel Stefan, CTO.
| Name | Title | Tier | Trades | Value | Last Trade |
|---|---|---|---|---|---|
| Kang Sun | Dir | — | 14 | $32.0M | 2026-08-21 |
| Constantin Ionel Stefan | CTO | — | 15 | $11.9M | 2026-08-21 |
| Wen Hsuan Hsieh | Dir | — | 1 | $7.6M | 2026-03-12 |
| Steven Chu | Dir | — | 1 | $5.9M | 2026-06-12 |
| Justin E. Mirro | Dir | — | 6 | $5.6M | 2024-09-05 |
| Donald R. Dixon | Dir | — | 3 | $2.5M | 2026-06-15 |
| Thomas M. Stepien | CEO | — | 4 | $1.3M | 2026-08-25 |
| Amprius, Inc. | 10% Owner | — | 2 | $1.1M | 2024-10-23 |
| Sandra Wallach | CFO | — | 6 | $712K | 2025-08-21 |
| Jonathan Bornstein | Pres | — | 4 | $666K | 2025-03-10 |
| Insider | Title | Type | Value | Date |
|---|---|---|---|---|
| Thomas M. Stepien | CEO | Sell | $324K | 2026-08-21 |
| Kang Sun | Director | Sell | $642K | 2026-08-21 |
| Constantin Ionel Stefan | CTO | Sell | $307K | 2026-08-21 |
| Donald R. Dixon | Director | Sell | $1.5M | 2026-06-15 |
| Donald R. Dixon | Director | Sell | $765K | 2026-06-09 |
| Thomas M. Stepien | CEO | Sell | $42K | 2026-06-04 |
Companies that share insiders with AMPX, and sector peers with recent insider buying. Related by who files, not by how the stocks move.
| Kang Sun | Director | Sell | $6K | 2026-05-27 |
| Constantin Ionel Stefan | CTO | Sell | $55K | 2026-05-27 |
| Thomas M. Stepien | CEO | Sell | $75K | 2026-05-27 |
| Donald R. Dixon | Director | Sell | $320K | 2026-05-26 |
| Constantin Ionel Stefan | CTO | Sell | $426K | 2026-05-21 |
| Thomas M. Stepien | CEO | Sell | $898K | 2026-05-21 |
| Kang Sun | Director | Sell | $1.0M | 2026-05-21 |
| Kang Sun | Director | Sell | $23.9M | 2026-04-01 |
| Kang Sun | Director | Sell | $8.2M | 2026-03-23 |