AMPX Insider Trading Activity and SEC Form 4 Filings
AMPX insider trading summary
Over the past 12 months, insiders at Amprius Technologies, Inc. (AMPX) reported 34 sales worth $78.0M by 5 insiders and no open-market purchases on SEC Form 4. Net insider selling was $78.0M.
Latest AMPX insider buys and sells
| Date | Insider | Role | Type | Value |
|---|---|---|---|---|
| Aug 24, 2026 | Thomas M Stepien | Chief Executive Officer | Sell | $80K (8,000 @ $10.03) |
| Aug 21, 2026 | Kang Sun | Director | Sell | $642K (62,101 @ $10.34) |
| Aug 21, 2026 | Constantin Ionel Stefan | Chief Technology Officer | Sell | $307K (29,681 @ $10.34) |
| Aug 21, 2026 | Thomas M Stepien | Chief Executive Officer | Sell | $243K (23,529 @ $10.34) |
| Jun 15, 2026 | Donald R Dixon | Director | Sell | $1.5M (85,000 @ $17.17) |
| Jun 9, 2026 | Donald R Dixon | Director | Sell | $765K (40,000 @ $19.13) |
| May 27, 2026 | Kang Sun | Director | Sell | $6K (356 @ $17.19) |
| May 27, 2026 | Constantin Ionel Stefan | Chief Technology Officer | Sell | $55K (3,208 @ $17.19) |
| May 27, 2026 | Thomas M Stepien | Chief Executive Officer | Sell | $75K (4,375 @ $17.19) |
| May 26, 2026 | Donald R Dixon | Director | Sell | $320K (17,895 @ $17.90) |
Source: SEC Form 4 filings. Open-market purchases (code P) and sales (code S) only; option exercises, grants and gifts are excluded.