Stepien Thomas M (CIK 2067233) reported 8 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-06-05). Recent activity: Sell AMPX (30,384 shares), Sell AMPX (36,914 shares), Buy AMPX (36,914 shares), Sell AMPX (2,000 shares), Buy AMPX (200,000 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-06-05 | Amprius Technologies, Inc. (AMPX) | Chief Executive Officer | Sell | 30,384 | $0 |
| 2026-06-05 | Amprius Technologies, Inc. (AMPX) | Chief Executive Officer | Sell | 36,914 | $0 |
| 2026-06-05 | Amprius Technologies, Inc. (AMPX) | Chief Executive Officer | Buy | 36,914 | $0 |
| 2026-06-05 | Amprius Technologies, Inc. (AMPX) | Chief Executive Officer | Sell | 2,000 | $41,940 |
| 2026-05-07 | Amprius Technologies, Inc. (AMPX) | Chief Executive Officer | Buy | 200,000 | $0 |
| 2026-03-06 | Amprius Technologies, Inc. (AMPX) | Chief Executive Officer | Buy | 150,000 | $0 |
| 2025-12-22 | Amprius Technologies, Inc. (AMPX) | President | Buy | 200,000 | $0 |
| 2025-05-06 | Amprius Technologies, Inc. (AMPX) | President | Buy | 400,000 | $0 |
Source: SEC Form 4 filings · as of 2026-06-05