Form 4 Filing for Eos Energy Enterprises, Inc.

This filing details a Form 4 filed by Joe Mastrangelo, Chief Executive Officer and Director of Eos Energy Enterprises, Inc. (EOSE). On August 24, 2026, Mastrangelo acquired 611,406 Restricted Stock Units (RSUs) with a transaction value of $0.00. These RSUs represent a contingent right to receive one share of common stock each. The RSUs were granted under the Issuer's 2020 Incentive Plan and will vest in three equal installments on each of the first three anniversaries of the grant date, contingent upon continued service. Following this transaction, Mastrangelo holds 611,406 shares of common stock underlying these RSUs. The filing was signed on August 26, 2026.