144 0001579989 XXXXXXXX LIVE 0001805077 EOS Energy Enterprises, Inc. 001-39291 3920 Park Avenue Edison NJ 08820 7322258400 Jeff Bornstein Officer Common UBS Financial Services Inc

1000 Harbor Blvd 3rd Floor Weehawken NJ 07086

32328 486425.67 288242532 12/05/2025 Nasdaq Common 04/30/2024 RSU Issuer N 32328 12/05/2025 N/A Y 12/05/2025 /s/Mijo Suric, for UBS Financial Services Inc, as attorney-in-fact for Jeff Bornstein