Form 4 Filing for Eos Energy Enterprises, Inc.

This filing details transactions made by Marian Walters, a director at Eos Energy Enterprises, Inc. (EOSE). On May 28, 2026, Walters acquired 30,000 shares of Common Stock at $1.18 per share, increasing her direct holdings to 188,445 shares. Subsequently, she disposed of 30,000 shares of Common Stock at $9.18 per share, reducing her direct holdings to 158,445 shares. Additionally, a derivative transaction involved the disposal of 30,000 stock options (right to buy) with an exercise price of $1.18, resulting in 35,018 options remaining. Indirectly, through the D. and M. Walters Family Trust, 5,000 shares of Common Stock are held. The filing also references previously granted stock options that vested on May 19, 2023, with a portion exercised on December 4, 2025, May 19, 2026, and May 20, 2026.