Thomas M Stepien insider trades: Amprius Technologies (AMPX) stock sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Thomas reports to the SEC
Open-market buys and sales
3 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Aug 24, 2026 | AMPX | ↓ Sell | 31,529 | $10.26 | $324K | Direct | Aug 25, 2026 (1d) |
| May 27, 2026 | AMPX | ↓ Sell | 4,375 | $17.19 | $75K | Direct | May 28, 2026 (1d) |
| May 21, 2026 | AMPX | ↓ Sell | 60,702 | $14.79 | $898K | Direct | May 26, 2026 (5d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other AMPX insiders
Open-market trades in the last 12 months
About Thomas M Stepien's insider trades
Thomas M Stepien is Chief Executive Officer at Amprius Technologies (AMPX). Since May 21, 2026, Thomas has reported no open-market purchases and 3 sales worth $1.3M on SEC Form 4. In the last 12 months: 3 sales ($1.3M).
Their filings also include grants and awards (5 filings), gifts (1 filing). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every AMPX insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.