Eos Energy Enterprises (NASDAQ: EOSE) announced the appointment of Haiyan Song to its board of directors and named Marie Batz Martin as its incoming chief legal officer, according to a company statement issued July 9, 2026.

Song brings more than three decades of experience in software, cloud, cybersecurity, and enterprise technology. She most recently served as executive vice president of NetApp's CloudOps business and has held senior roles at F5, Splunk, and Hewlett Packard Enterprise. She also serves on the boards of CSG and Kodiak Solutions. Song will join as an independent director, filling a seat vacated by Nate Fick, who transitions to the preferred stock director seat previously held by Greg Nixon, who elected to step down. The board's overall size and composition remain unchanged following these moves.

"Haiyan brings proven cybersecurity, cloud and software expertise to our Board," said Joe Nigro, chairman of the board.

Martin will assume the chief legal officer role effective July 13, 2026. She most recently served as global vice president and chief compliance officer at Coherent Corp. and previously held the role of executive vice president, general counsel, corporate secretary, and chief compliance officer at FlightSafety International. She also spent more than a decade at Alcoa and Arconic.

Current chief legal officer Michael Silberman will remain with the company as a non-executive employee through September 11, 2026, to support the transition. During his tenure, Silberman helped secure a U.S. Department of Energy loan, a strategic investment from Cerberus Capital Management, and the launch of Frontier Power USA.

"Marie has built high-performing teams and advised complex global businesses through periods of growth and operational change," said CEO Joe Mastrangelo.