X0306 4 2021-12-08 1 0001844862 Solid Power, Inc. SLDP 0001844863 Decarbonization Plus Acquisition Sponsor III LLC C/O RIVERSTONE HOLDINGS LLC 712 FIFTH AVENUE, 36TH FLOOR NEW YORK NY 10019 0 0 1 0 0001247497 RIVERSTONE HOLDINGS LLC C/O RIVERSTONE HOLDINGS LLC 712 FIFTH AVENUE, 36TH FLOOR NEW YORK NY 10019 0 0 1 0 0001222726 LEUSCHEN DAVID M C/O RIVERSTONE HOLDINGS LLC 712 FIFTH AVENUE, 36TH FLOOR NEW YORK NY 10019 1 0 1 0 0001232151 LAPEYRE PIERRE F JR C/O RIVERSTONE HOLDINGS LLC 712 FIFTH AVENUE, 36TH FLOOR NEW YORK NY 10019 1 0 1 0 Warrants (right to buy) 11.50 2021-12-08 4 J 0 7367353 1.50 D 2022-03-26 Class A Common Stock 7367353 7367353 I See footnote The warrants will expire on December 8, 2026, five years after the completion of the issuer's initial business combination which occurred on December 8, 2021, or earlier upon redemption or liquidation. These warrants represent warrants held by Decarbonization Plus Acquisition Sponsor III LLC that were acquired pursuant to the private placement warrants purchase agreement, dated March 23, 2021. David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Holdings LLC, which controls Decarbonization Plus Acquisition Sponsor III LLC. Each of Riverstone Holdings LLC, Mr. Leuschen and Mr. Lapeyre may be deemed to have or share beneficial ownership of the securities held directly by Decarbonization Plus Acquisition Sponsor III LLC. Each such entity or person disclaims any such beneficial ownership of such securities except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for purposes of Section 16 or for any other purpose. Decarbonization Plus Acquisition Sponsor III LLC, /s/ Peter Haskopoulos, Managing Director 2021-12-10 Riverstone Holdings LLC, /s/ Peter Haskopoulos, Authorized Person 2021-12-10 David M. Leuschen, /s/ Peter Haskopoulos, Attorney-in-fact 2021-12-10 Pierre F. Lapeyre, Jr. /s/ Peter Haskopoulos, Attorney-in-fact 2021-12-10