As of the latest Form 4 filed Jun 16, 2026.
What Amprius Technologies Inc. insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 37 most recent filings for AMPX.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-06-16 | 2026-06-15 | DIXON DONALD R Director | SSale | −85.0K | $17.17 | $1.46M | No | Form 4 ↗ |
| 2026-06-16 | 2026-06-12 | SATTERTHWAITE LIVINGSTON Director | AAward | +10.4K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-16 | 2026-06-12 | Chu Steven Director | AAward | +10.4K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-16 | 2026-06-12 | BAYLESS KATHLEEN A Director | AAward | +10.4K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-16 | 2026-06-12 | DIXON DONALD R Director | AAward | +10.4K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-11 | 2026-06-09 | DIXON DONALD R Director | SSale | −40.0K | $19.13 | $765K | No | Form 4 ↗ |
| 2026-06-05 | 2026-06-04 | Stepien Thomas M Chief Executive Officer | SSale | −2.00K | $20.97 | $41.9K | No | Form 4 ↗ |
| 2026-06-05 | 2026-06-04 | Stepien Thomas M, Chief Executive Officer | GGift | +36.9K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-05 | 2026-06-04 | Stepien Thomas M, Chief Executive Officer | GGift | −36.9K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-05 | 2026-06-04 | Stepien Thomas M, Chief Executive Officer | GGift | −30.4K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-28 | 2026-05-27 | Stepien Thomas M Chief Executive Officer | SSale | −4.38K | $17.19 | $75.2K | No | Form 4 ↗ |
| 2026-05-28 | 2026-05-27 | Stefan Constantin Ionel Chief Technology Officer | SSale | −3.21K | $17.19 | $55.2K | No | Form 4 ↗ |
| 2026-05-28 | 2026-05-27 | Sun Kang Director | SSale | −356.00 | $17.19 | $6.12K | No | Form 4 ↗ |
| 2026-05-28 | 2026-05-26 | DIXON DONALD R Director | SSale | −17.9K | $17.90 | $320K | No | Form 4 ↗ |
| 2026-05-26 | 2026-05-21 | Stepien Thomas M Chief Executive Officer | SSale | −60.7K | $14.79 | $898K | No | Form 4 ↗ |
| 2026-05-26 | 2026-05-21 | Stefan Constantin Ionel Chief Technology Officer | SSale | −28.8K | $14.79 | $426K | No | Form 4 ↗ |
| 2026-05-26 | 2026-05-21 | Sun Kang Director | SSale | −67.8K | $14.79 | $1.00M | No | Form 4 ↗ |
| 2026-05-07 | 2026-05-05 | Sun Kang Director | AAward | +6.25K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-04-02 | 2026-04-01 | Sun Kang Director | SSale | −249K | $16.78 | $4.18M | No | Form 4 ↗ |
| 2026-04-02 | 2026-04-01 | Sun Kang, Director | SSale | −1.25M | $15.73 | $19.7M | No | Form 4 ↗ |
| 2026-04-02 | 2026-04-01 | Sun Kang, Director | MExercise | +187K | $3.68 | $690K | No | Form 4 ↗ |
| 2026-04-02 | 2026-04-01 | Sun Kang, Director | MExercise | +1.31M | $1.78 | $2.34M | No | Form 4 ↗ |
| 2026-03-24 | 2026-03-23 | Sun Kang Director | SSale | −65.0K | $19.06 | $1.24M | No | Form 4 ↗ |
| 2026-03-24 | 2026-03-23 | Sun Kang, Director | SSale | −153K | $18.69 | $2.86M | No | Form 4 ↗ |
| 2026-03-13 | 2026-03-12 | HSIEH Wen Hsuan Director | SSale | −131K | $18.22 | $2.38M | No | Form 4 ↗ |
| 2026-03-13 | 2026-03-12 | HSIEH Wen Hsuan, Director | SSale | −283K | $18.55 | $5.24M | No | Form 4 ↗ |
| 2026-03-13 | 2026-03-12 | HSIEH Wen Hsuan, Director | MExercise | +270K | $2.61 | $705K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-12 | Chu Steven Director | SSale | −5.57K | $18.53 | $103K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-12 | Chu Steven, Director | SSale | −50.0K | $18.21 | $911K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-12 | Chu Steven, Director | SSale | −100K | $18.65 | $1.86M | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-12 | Chu Steven, Director | MExercise | +69.4K | $0.62 | $43.0K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-12 | Chu Steven, Director | MExercise | +86.1K | $2.61 | $225K | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Chu Steven, Director | SSale | −167K | $17.92 | $2.99M | No | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Chu Steven, Director | MExercise | +104K | $0.62 | $64.6K | No | Form 4 ↗ |
| 2026-03-06 | 2026-03-04 | Stepien Thomas M Chief Executive Officer | AAward | +150K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-03-06 | 2026-03-04 | Stefan Constantin Ionel Chief Technology Officer | AAward | +110K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-03-06 | 2026-03-04 | RODRIGUEZ RICARDO C. Chief Financial Officer | AAward | +150K | $0.00 | $0.00 | No | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also AMPX’s full analysis or the market-wide insider trading feed. The tabs above jump to AMPX’s other SEC data.
Source: SEC Form 4 filings for AMPX, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
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