Amprius Technologies, Inc (AMPX) insider trading
Every open-market stock purchase and sale by Amprius Technologies, Inc executives, directors, large shareholders and members of Congress, from SEC Form 4 filings. Sector: Other.
Insider activity at a glance
- Kang Sun (Director) and 2 others sold $1.3M in the last 90 days.
- No open-market insider buys on record.
Last 12 months: insiders bought $0 (0 buys) and sold $85.7M (27 sales). Last close $10.51 on Aug 27, 2026.
Recent AMPX insider trades
| Date | Insider | Trade | Value |
|---|---|---|---|
| Aug 25, 2026 | Thomas M Stepien (CEO) | Sold (not open market) | — |
| Aug 25, 2026 | Thomas M Stepien (CEO) | Bought (not open market) | — |
| Aug 25, 2026 | Thomas M Stepien (CEO) | Sold (not open market) | — |
| Aug 24, 2026 | Thomas M Stepien (CEO) | Sold | $80.2K |
| Aug 21, 2026 | Kang Sun (Director) | Sold | $642K |
| Aug 21, 2026 | Constantin Ionel Stefan (CTO) | Sold | $307K |
| Aug 21, 2026 | Thomas M Stepien (CEO) | Sold | $243K |
| Jun 15, 2026 | Donald R Dixon (Director) | Sold | $1.5M |
| Jun 12, 2026 | Donald R Dixon (Director) | Bought (not open market) | — |
| Jun 12, 2026 | Kathleen A Bayless (Director) | Bought (not open market) | — |
| Jun 12, 2026 | Steven Chu (Director) | Bought (not open market) | — |
| Jun 12, 2026 | Livingston Satterthwaite (Director) | Bought (not open market) | — |
| Jun 9, 2026 | Donald R Dixon (Director) | Sold | $765K |
| Jun 4, 2026 | Thomas M Stepien (CEO) | Sold | $41.9K |
| Jun 4, 2026 | Thomas M Stepien (CEO) | Sold (not open market) | — |
| Jun 4, 2026 | Thomas M Stepien (CEO) | Bought (not open market) | — |
| May 27, 2026 | Thomas M Stepien (CEO) | Sold | $75.2K |
| May 27, 2026 | Constantin Ionel Stefan (CTO) | Sold | $55.2K |
| May 27, 2026 | Kang Sun (Director) | Sold | $6.1K |
| May 26, 2026 | Donald R Dixon (Director) | Sold | $320K |
| May 21, 2026 | Kang Sun (Director) | Sold | $1M |
| May 21, 2026 | Thomas M Stepien (CEO) | Sold | $898K |
| May 21, 2026 | Constantin Ionel Stefan (CTO) | Sold | $426K |
| May 5, 2026 | Kang Sun (Director) | Bought (not open market) | — |
| Apr 1, 2026 | Kang Sun (Director) | Sold | $19.7M |
Who's trading AMPX
- Thomas M Stepien, CEO: sold $1.3M (5 sales), last Aug 25, 2026
- Constantin Ionel Stefan, CTO: sold $10.7M (10 sales), last Aug 21, 2026
- Kang Sun, Director: sold $57.6M (13 sales), last Aug 21, 2026
- Donald R Dixon, Director: sold $2.5M (3 sales), last Jun 15, 2026
- Steven Chu, Director: sold $5.9M (4 sales), last Jun 12, 2026
- Kathleen A Bayless, Director: other filings, last Jun 12, 2026
- Livingston Satterthwaite, Director: other filings, last Jun 12, 2026
- Wen Hsuan HSIEH, Director: sold $7.6M (2 sales), last Mar 12, 2026
- Ricardo C. Rodriguez, CFO: other filings, last Mar 4, 2026
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