X0407 4 2023-02-28 1 0001805077 Eos Energy Enterprises, Inc. EOSE 0001888978 Wood River Capital, LLC 4111 E. 37TH STREET NORTH WICHITA KS 67220 0 0 0 1 Former 10% Owner 0000923338 KOCH INDUSTRIES INC 4111 E. 37TH STREET NORTH WICHITA KS 67220 0 0 0 1 Former 10% Owner 0 The Reporting Persons no longer beneficially own 10% or more of Eos Energy Enterprises, Inc.'s (the "Issuer") common stock, par value $0.0001 per share. As a result, the Reporting Persons are no longer subject to Section 16 in connection with their transactions in the equity securities of the Issuer and therefore will no longer report any such transactions on Form 4 or Form 5. Wood River Capital, LLC /s/ Raffaele G. Fazio, Vice President and Secretary 2023-05-04 Koch Industries, Inc. /s/ Raffaele G. Fazio, Assistant Secretary 2023-05-04