144 0001613718 XXXXXXXX LIVE 0001805077 Eos Energy Enterprises, Inc. 001-39291 3920 PARK AVENUE EDISON NJ 08820 (732) 225-8400 Kroeker Nathan Officer Common UBS Financial Services Inc.

Eleven Madison Avenue 4th Floor New York NY 10010

50000 849250.00 288242532 01/26/2026 NASDAQ Common 01/23/2026 RSU Vesting Issuer N 50000 01/23/2026 N/A Y The shares reported on this Form 144 will be sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person to cover estimated tax withholding obligations from the vesting of restricted stock units. 01/26/2026 09/15/2025 /s/ UBS Financial Services Inc, as attorney-in-fact for Nathan Kroeker