Amprius Technologies Appoints Tom Stepien as Chief Executive Officer

Amprius Technologies, Inc. (“Amprius” or the “Company”) (NYSE: AMPX), a leader in next-generation lithium-ion batteries with its Silicon Anode Platform, announced that its Board of Directors (the “Board”) has appointed President Tom Stepien as its next Chief Executive Officer (“CEO”), effective January 1, 2026.

Current Amprius CEO Dr. Kang Sun will be retiring at the end of 2025. Dr. Sun will continue to serve as a director on the Board and as an Executive Advisor, providing strategic guidance to the Company.

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.

“Leading Amprius Technologies has been one of the most rewarding experiences of my career,” said Dr. Kang Sun. “I am proud of what our team has accomplished in advancing silicon anode technology from the lab to commercial deployment. As I transition from the CEO position, I look forward to supporting Amprius in my ongoing roles and helping the Company continue to grow while delivering breakthrough solutions to our customers.”

Tom Stepien joined Amprius as President in May 2025 and has strengthened operations, expanded customer engagement, and advanced the Company’s growth strategy. Stepien brings over 35 years of leadership experience across customer-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.

“I am honored to step into the role of CEO and advance the industry-leading foundation that Kang and the team have built,” said Stepien. “Amprius’ silicon anode technology continues to set new standards for performance, and I look forward to leading the Company through its next phase of growth and innovation.”

“On behalf of the Board and the entire Amprius team, I want to thank Kang for his exceptional leadership and pioneering vision,” said Don Dixon, Chairman of the Board. “We are equally excited to welcome Tom as CEO. With his leadership experience and deep knowledge of the energy storage industry, Tom is well-positioned to drive Amprius’ continued success.”