| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
Chief Executive Officer | President
1 company
Thomas M Stepien is Chief Executive Officer at AMPX. Thomas M Stepien's net worth is not public. Form 4 filings only show shares in the companies where this person is an insider; those holdings are worth an estimated $5.4M at current prices.
Our model assigns Thomas M Stepien a middling insider score of 62/100, based on 3 past trades. On a 3-month view, all 3 of the rated trades came out ahead, averaging +43.0% over three months.
The AMPX filings lean toward selling, a net 98,606 shares.
Thomas M Stepien has 7 Form 4 filings on record from May 2025 to August 2026, all as Chief Executive Officer at Amprius Technologies, Inc. WT (AMPX), 2025–2026.
The 16 reported transactions were 7 gifts, 5 open-market sales and 4 stock awards.
Counted by filing, the open-market trades come to no purchases and 4 sales worth about $1.3M.
The largest open-market sale was 60,702 shares of AMPX at an average $14.79 on May 21, 2026, about $898K.
None of the 4 sales since April 2023 was marked as made under a Rule 10b5-1 trading plan.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Aug 24, 2026 | AMPX Amprius Technologies, Inc. Wt | Chief Executive Officer | Sell | 31,529 | $10.26 | $323,553.39 | -5.0% | - | - | |
| Jun 4, 2026 | AMPX Amprius Technologies, Inc. | Chief Executive Officer | Sell | 2,000 | $20.97 | $41,940.00 | -0.3% | -57.8% | - | |
| May 27, 2026 | AMPX Amprius Technologies, Inc. Wt | Chief Executive Officer | Sell | 4,375 | $17.19 | $75,221.56 | -0.6% | -40.7% | - | |
| May 21, 2026 | AMPX Amprius Technologies, Inc. | Chief Executive Officer | Sell | 60,702 | $14.79 | $897,685.46 | -8.0% | -30.5% | - |