![Thomas Stepien](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%231b1b1b" class="bi bi-person-fill" viewBox="0 0 16 16"><path d="M3 14s-1 0-1-1 1-4 6-4 6 3 6 4-1 1-1 1zm5-6a3 3 0 1 0 0-6 3 3 0 0 0 0 6"/></svg>)
Thomas Stepien
Chief Executive Officer at
AMPRIUS TECHNOLOGIES, INC.
Net worth: 13 M $ as of 2026-05-30
Profile
Mr. Thomas M.
Stepien is a Chief Executive Officer & Director at Amprius Technologies, Inc., a President at Amprius Technologies, Inc. (United States) and an Independent Non-Executive Director at Euro Manganese, Inc. He is on the Board of Directors at Amprius Technologies, Inc., Euro Manganese, Inc. and Primus Power Corp.
Mr. Stepien was previously employed as a Chief Executive Officer by South 8 Technologies, Inc., a Chief Executive Officer by QM Power, Inc., and a VP & GM-Mainstream Technology Solutions by Applied Materials, Inc. He received his undergraduate degree from Massachusetts Institute of Technology and a graduate degree from Massachusetts Institute of Technology.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
| 2026-06-03 | 662,539 ( 0.47% ) | 13 M $ | 2026-05-30 | |
EURO MANGANESE, INC. 0.04% | 2025-05-27 | 63,555 ( 0.04% ) | 5 212 $ | 2026-05-30 |
Thomas Stepien active positions
| Companies | Position | Start |
|---|---|---|
| EURO MANGANESE INC. | Director/Board Member | 2020-09-21 |
| AMPRIUS TECHNOLOGIES, INC. | Chief Executive Officer | 2025-12-31 |
Primus Power Corp.
 Primus Power Corp. Electrical ProductsProducer Manufacturing Designs, develops and distributes energy storage systems | Founder | 2009-03-31 |
Amprius Technologies, Inc. (United States)
 Amprius Technologies, Inc. (United States) Electrical ProductsProducer Manufacturing Manufactures and develops high energy and high capacity lithium-ion batteries | President | 2025-04-30 |
Former positions of Thomas Stepien
| Companies | Position | End |
|---|---|---|
South 8 Technologies, Inc.
 South 8 Technologies, Inc. Electrical ProductsProducer Manufacturing Develops liquefied gas electrolyte chemistry for rechargeable lithium metal batteries and electrochemical capacitors | Chief Executive Officer | 2025-02-28 |
QM Power, Inc.
 QM Power, Inc. Electrical ProductsProducer Manufacturing Develops and commercializes electric motors, generators and actuators | Chief Executive Officer | 2023-06-30 |
| APPLIED MATERIALS, INC. | Corporate Officer/Principal | 2009-02-28 |
Training of Thomas Stepien
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
83
1st degree connections
8
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 8 |
|---|---|
Applied Materials, Inc.
 Applied Materials, Inc. Industrial MachineryProducer Manufacturing Designs, develops, manufactures and sells equipment to fabricate semiconductor chips, spare parts, factory automation software & liquid crystal displays | Producer Manufacturing |
Massachusetts Institute of Technology
 Massachusetts Institute of Technology Finance/Rental/LeasingFinance Functions as a College/University | Finance |
Amprius Technologies, Inc. (United States)
Amprius Technologies, Inc. (United States) Electrical ProductsProducer Manufacturing Manufactures and develops high energy and high capacity lithium-ion batteries | Producer Manufacturing |
Primus Power Corp.
Primus Power Corp. Electrical ProductsProducer Manufacturing Designs, develops and distributes energy storage systems | Producer Manufacturing |
QM Power, Inc.
QM Power, Inc. Electrical ProductsProducer Manufacturing Develops and commercializes electric motors, generators and actuators | Producer Manufacturing |
Euro Manganese, Inc.
 Euro Manganese, Inc. Other Metals/MineralsNon-Energy Minerals Engages in mining of manganese metals | Non-Energy Minerals |
South 8 Technologies, Inc.
South 8 Technologies, Inc. Electrical ProductsProducer Manufacturing Develops liquefied gas electrolyte chemistry for rechargeable lithium metal batteries and electrochemical capacitors | Producer Manufacturing |
Amprius Technologies, Inc.
 Amprius Technologies, Inc. Electrical ProductsProducer Manufacturing Manufactures and distributes lithium-ion batteries | Producer Manufacturing |
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