X0609 4 2026-07-13 0 0001805077 Eos Energy Enterprises, Inc. EOSE 0001804708 Song Haiyan false C/O EOS ENERGY ENTERPRISES, INC. TWO ALLEGHENY CENTER, NOVA TOWER 2 PITTSBURGH PA 15212 1 0 0 0 0 Restricted Stock Units 2026-07-13 4 A 0 29980 0 A Common Stock 29980 29980 D Each restricted stock unit ("RSU") represents a contingent right to receive one share of common stock. The reporting person was granted RSUs that settle in cash or common stock, which will vest on the earlier of (i) the first anniversary of the grant date and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the grant date. Not applicable. /s/ Marie Martin as attorney-in-fact for Haiyan Song 2026-07-15