Amprius Technologies, Inc. (AMPX)
NYSE: AMPX · Miscellaneous Electrical Machinery, Equipment & Supplies · Fremont, CA · filing with the SEC since 2021
Who runs Amprius Technologies, Inc.
Officers and directors as they report to the SEC on Forms 3, 4 and 5, named as filedChief executive, as filed
Stepien Thomas M
Chief Executive Officer. First filing May 2025, latest Aug 25, 2026, 4 filings in all.
Officers reporting now
5
of 10 people with a filing in the last fifteen months
Directors reporting now
5
23 people on the record since 2022
Officerssales are open-market, Sep 30, 2025 to Sep 30, 2026
| Name | Title as filed | First filing | Latest filing | Sales, 12 months |
|---|---|---|---|---|
| Stepien Thomas M | Chief Executive Officer | May 2025 | Aug 25, 2026 | 5 · $1.3M |
| Sun Kang | Chief Executive Officer | Sep 2022 | Aug 25, 2026 | 13 · $57.6M |
| Stefan Constantin Ionel | Chief Technology Officer | Sep 2022 | Aug 25, 2026 | 10 · $10.7M |
| Rodriguez Ricardo C. | Chief Financial Officer | Oct 2025 | Mar 13, 2026 | none |
| Wallach Sandra | Chief Financial Officer | Sep 2022 | Aug 25, 2025 | none |
Directorssales are open-market, Sep 30, 2025 to Sep 30, 2026
| Name | Role | First filing | Latest filing | Sales, 12 months |
|---|---|---|---|---|
| Bayless Kathleen A | director | Apr 2023 | Jun 16, 2026 | none |
| Chu Steven | director | Sep 2022 | Jun 16, 2026 | 4 · $5.9M |
| Dixon Donald R | director | Sep 2022 | Jun 16, 2026 | 3 · $2.5M |
| Satterthwaite Livingston | director | Aug 2024 | Jun 16, 2026 | none |
| Hsieh Wen Hsuan | director | Sep 2022 | Mar 13, 2026 | 2 · $7.6M |
Earlier names on the record15, newest filing first
Bornstein Jonathan · officer · last filing Mar 2025Amprius, Inc. · 10% owner · last filing Oct 2024Mirro Justin E · officer · last filing Sep 2024Gustanski Mary · director · last filing Jun 2024Kensington Capital Sponsor IV LLC · 10% owner · last filing Sep 2022Lasorda Thomas William · director · last filing Mar 2022Zetsche Dieter · officer · last filing Mar 2022Huber Daniel Elliot · officer · last filing Mar 2022Remenar Robert J · officer · last filing Mar 2022Boag Simon · officer · last filing Mar 2022Nason Nicole · director · last filing Mar 2022Pettersson Anders · director · last filing Mar 2022Quain Mitchell I · director · last filing Mar 2022Runkle Donald L · director · last filing Mar 2022Simoncini Matthew · director · last filing Mar 2022
A person is listed as reporting now after a filing in the last fifteen months. The record shows when someone last filed; it does not say why they stopped. Each name links to the filings on sec.gov.