Eos Energy board chair Stidolph resigns; Joseph Nigro appointed successor

Eos Energy Enterprises, Inc.

Russell Stidolph resigns from Board effective Dec 31, 2025, to focus on AltEnergy Acquisition Corp.
Joseph Nigro to become non-executive Chair effective Jan 1, 2026.
Nigro previously served as CFO of Exelon and CEO of Constellation; joined Eos Board in early 2025.
Stidolph had been non-executive Chair since April 2018 and invested through AltEnergy for 11 years.

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