Amprius Technologies Inc.
Last updated September 27, 2026
Organization details
- Legal name
- Amprius Technologies Inc.
- Former names
- Kensington Capital Acquisition Corp. IV
- Ownership
- Public
- Status
- Active
- SIC code
- 3690 — Miscellaneous Electrical Machinery, Equipment & Supplies
- Jurisdiction of incorporation
- Delaware
- Headquarters city
- Fremont
- Headquarters state / province
- California
- Headquarters country
- United States
- Fiscal year end
- December
- Ticker symbol
- AMPX
- Primary stock exchange
- NYSE
Identifiers
- SEC CIK
- 0001899287
- EIN
- 98-1591811
Board of directors
-
Donald R. Dixon · DirectorSince 2023
-
Justin E. Mirro · DirectorSince 2023
-
Kang Sun · Director · Chief Executive OfficerSince 2024
-
Kathleen A. Bayless · DirectorSince 2023
-
Livingston Satterthwaite · DirectorSince 2024
-
Mary Gustanski · DirectorSince 2023
-
Steven Chu · DirectorSince 2023
-
Thomas M. Stepien · Director · Chief Executive OfficerSince 2025
-
Wen Hsuan Hsieh · DirectorSince 2023
Chief executives
Kang Sun
· Chief Executive Officer
Dates unknown
Thomas M. Stepien
· Chief Executive Officer
Dates unknown
Director election results
Annual meeting of June 11, 2026. Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
-
71.4%
-
76.4%
Board connections
4 of this board's directors also sit on 7 other boards.
- via Wen Hsuan Hsieh
- via Wen Hsuan Hsieh
- via Livingston Satterthwaite
- via Mary Gustanski
- via Livingston Satterthwaite
- via Livingston Satterthwaite
- via Kathleen A. Bayless
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
- Bought, last 12 months
- $0
- 0 purchases by 0 insiders
- Sold, last 12 months
- $85,689,249
- 37 sales by 6 insiders
| Date | Insider | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Aug 25, 2026 | Thomas M. Stepien Director, Officer (Chief Executive Officer) | Gift | −5,000 | — | — |
| Aug 25, 2026 | Thomas M. Stepien Director, Officer (Chief Executive Officer) | Gift | −5,000 | — | — |
| Aug 25, 2026 | Thomas M. Stepien Director, Officer (Chief Executive Officer) | Gift | −5,000 | — | — |
| Aug 25, 2026 | Thomas M. Stepien Director, Officer (Chief Executive Officer) | Gift | −346 | — | — |
| Aug 25, 2026 | Thomas M. Stepien Director, Officer (Chief Executive Officer) | Grant or award | +346 | — | — |
| Aug 24, 2026 | Thomas M. Stepien Director, Officer (Chief Executive Officer) | Open-market sale | −8,000 | $10.03 | $80,240 |
| Aug 21, 2026 | Kang Sun Director | Open-market sale | −62,101 | $10.34 | $642,186 |
| Aug 21, 2026 | Stefan Constantin Ionel Officer (Chief Technology Officer) | Open-market sale | −29,681 | $10.34 | $306,931 |
| Aug 21, 2026 | Thomas M. Stepien Director, Officer (Chief Executive Officer) | Open-market sale | −23,529 | $10.34 | $243,313 |
| Jun 15, 2026 | Donald R. Dixon Director | Open-market sale | −85,000 | $17.17 | $1,459,450 |
| Jun 12, 2026 | Kathleen A. Bayless Director | Grant or award | +10,423 | — | — |
| Jun 12, 2026 | Livingston Satterthwaite Director | Grant or award | +10,423 | — | — |
| Jun 12, 2026 | Donald R. Dixon Director | Grant or award | +10,423 | — | — |
| Jun 12, 2026 | Steven Chu Director | Grant or award | +10,423 | — | — |
| Jun 9, 2026 | Donald R. Dixon Director | Open-market sale | −40,000 | $19.13 | $765,200 |
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