Amprius Technologies, Inc. announced that its Board of Directors has appointed President Tom Stepien as its next Chief Executive Officer, effective January 1, 2026. Tom Stepien, his age is 64, focused, innovation-driven technology companies. Prior to Amprius, Stepien served as CEO of South 8 Technologies, a provider of novel electrolyte for lithium-ion batteries; cofounded and led Primus Power, a long-duration stationary storage company; and was an Operating Partner at KCK Group, a private equity firm focused on industrial technologies.
Earlier in his career, he held leadership roles at Applied Materials, the global semiconductor equipment leader. On December 18, 2025, Dr. Kang Sun, the Chief Executive Officer of Amprius Technologies, Inc. informed the Company's Board of Directors (the "Board") of his intention to step down from his officer position, effective as of December 31, 2025. Dr. Sun will assume the position of Executive Advisor of the Company on January 1, 2026.
Dr. Sun will continue to be a member of the Board. Dr. Sun's decision to step down is not the result of any disagreement regarding any matter relating to the Company's operations, policies or practices. Dr. Sun founded Amprius in 2015 and has served as its CEO since.
In that time, he has led the Company in pioneering and commercializing silicon-anode batteries that have achieved industry-leading energy density and performance milestones. Under his leadership, Amprius has become an innovator in advanced battery solutions for aerospace, electric mobility, and other high-performance applications, helping to shape the future direction of next-generation batteries.
