X0206 3 2021-07-07 0 0001805077 Eos Energy Enterprises, Inc. EOSE 0001451531 SPRING CREEK CAPITAL LLC 4111 EAST 37TH STREET NORTH WICHITA KS 67220 0 0 1 0 0001811865 SCC Holdings, LLC 4111 E 37TH STREET NORTH WICHITA KS 67220 0 0 1 0 0000923338 KOCH INDUSTRIES INC 4111 EAST 37TH STREET NORTH WICHITA KS 67220 0 0 1 0 Common Stock 2538261 D 5% / 6% Convertible Senior PIK Toggle Notes Due 2021 20 2021-07-07 2026-06-20 Common Stock 4999100 D Represents shares of common stock held by Spring Creek Capital, LLC ("Spring Creek"). Spring Creek is 100% owned by SCC Holdings, LLC ("SCC Holdings") and SCC Holdings is 100% owned by Koch Industries, Inc. ("Koch Industries"). Koch Industries and SCC Holdings may be deemed to beneficially own the Common Stock held by Spring Creek by virtue of Koch Industries' ownership of SCC Holdings and SCC Holdings' ownership of Spring Creek. Each of SCC Holdings and Koch Industries disclaim such beneficial ownership except to the extent of their pecuniary interest therein. Spring Creek Capital, LLC /s/ Raffaele G. Fazio, Secretary 2021-07-14 SCC Holdings, LLC /s/ Raffaele G. Fazio, Secretary 2021-07-14 Koch Industries, Inc. /s/ Raffaele G. Fazio, Assistant Secretary 2021-07-14