Eos Energy Enterprises, Inc. 8-K

What Happened
Eos Energy Enterprises, Inc. announced in a Form 8-K filed December 22, 2025 that director Russell Stidolph has resigned from the Board effective December 31, 2025 to devote more time to other business ventures. Joseph Nigro will succeed Mr. Stidolph as non‑executive chair of the Board, effective January 1, 2026.

Key Details

• Filing: Form 8-K filed December 22, 2025 (Item 5.02).
• Resignation effective date: Russell Stidolph — December 31, 2025.
• Successor appointment: Joseph Nigro named non‑executive chair effective January 1, 2026.
• Reason given: Stidolph resigned to devote more time to other business ventures.

Why It Matters
This is a board leadership change (non‑executive chair) rather than an executive management departure, so it does not directly indicate an operational change in the company’s day‑to‑day management. Investors should note the governance transition and new board leadership effective at the start of 2026; such changes can affect board oversight and strategic direction over time. The 8-K provides the official dates and reason for the transition.