Insider · SEC Forms 3, 4, 5
CIK 1494730
All transactions
Every Form 4 row this person reported, newest first
Insider · SEC Forms 3, 4, 5
Every Form 4 row this person reported, newest first
Stepien Thomas M (CIK 2067233) reported 17 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-08-25). Recent activity: Sell AMPX (23,529 shares), Sell AMPX (8,000 shares), Sell AMPX (5,000 shares), Sell AMPX (5,000 shares), Sell AMPX (5,000 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-25 | Amprius Technologies, Inc. (AMPX) | Chief Executive Officer | Sell | 23,529 | $243,313 |
| 2026-08-25 | Amprius Technologies, Inc. (AMPX) | Chief Executive Officer | Sell | 8,000 | $80,240 |
| 2026-08-25 | Amprius Technologies, Inc. (AMPX) | Chief Executive Officer | Sell | 5,000 | $0 |
| 2026-08-25 | Amprius Technologies, Inc. (AMPX) | Chief Executive Officer | Sell | 5,000 | $0 |
| 2026-08-25 | Amprius Technologies, Inc. (AMPX) | Chief Executive Officer | Sell | 5,000 | $0 |
| 2026-08-25 | Amprius Technologies, Inc. (AMPX) | Chief Executive Officer | Sell | 346 | $0 |
| 2026-08-25 | Amprius Technologies, Inc. (AMPX) | Chief Executive Officer | Buy | 346 | $0 |
| 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 |
| 2026-05-28 | Amprius Technologies, Inc. (AMPX) | Chief Executive Officer | Sell | 4,375 | $75,206 |
| 2026-05-26 | Amprius Technologies, Inc. (AMPX) | Chief Executive Officer | Sell | 60,702 | $897,783 |
| 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 2026-08-25