AMPX insider trading — Amprius Technologies, Inc.
Over the last 90 days, insiders at Amprius Technologies, Inc. (AMPX) made 0 open-market purchases worth $0 and 4 open-market sales worth $1.27M, making them net sellers by $1.27M. The largest sale was by Sun Kang (Director), who sold 62,101 shares for $642K on Aug 21, 2026.
Updated Oct 16, 2026.
Recent AMPX insider transactions
Every Form 4 filed by Amprius Technologies, Inc. officers, directors and 10% owners in the last 90 days, newest first. P = open-market purchase, S = open-market sale; other codes are awards, option exercises, tax withholding or gifts.
| Trade date | Insider | Role | Type | Ownership | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|---|
| Aug 21, 2026 | Sun Kang | Director | S · Sale | Direct | 62,101 | $10.34 | $642K | Form 4 |
| Aug 21, 2026 | Stefan Constantin Ionel | Chief Technology Officer | S · Sale | Direct | 29,681 | $10.34 | $307K | Form 4 |
| Aug 25, 2026 | Stepien Thomas M | Chief Executive Officer | G · Gift | Direct | 15,346 | — | — | Form 4 |
| Aug 25, 2026 | Stepien Thomas M | Chief Executive Officer | A · Grant/award | Indirect | 346 | — | — | Form 4 |
| Aug 24, 2026 | Stepien Thomas M | Chief Executive Officer | S · Sale | Direct | 8,000 | $10.03 | $80K | Form 4 |
| Aug 21, 2026 | Stepien Thomas M | Chief Executive Officer | S · Sale | Direct | 23,529 | $10.34 | $243K | Form 4 |
AMPX insider trading FAQ
Are insiders buying AMPX stock?
Not on the open market. In the last 90 days, Amprius Technologies, Inc. insiders made no open-market purchases, and 4 open-market sales totaling $1.27M. Purchases with the insider's own money are generally seen as a stronger signal than sales, which happen for many reasons (taxes, diversification, planned 10b5-1 sales).
Who are the insiders trading AMPX?
Recent sellers: Stefan Constantin Ionel, Stepien Thomas M, Sun Kang.
Where does AMPX insider trading data come from?
Every transaction comes from SEC Form 4 filings on EDGAR. Company officers, directors and 10% owners must file a Form 4 within two business days of buying or selling. InsiderBolt reads these filings directly from the SEC.
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Insider trading data is for informational purposes only and is not investment advice. Filings can be amended; always confirm details on SEC EDGAR.