X0306 4 2023-01-17 1 0001848959 Decarbonization Plus Acquisition Corp IV DCRD 0001848961 Decarbonization Plus Acquisition Sponsor IV LLC C/O DECARBONIZATION PLUS ACQ CORP IV 2744 SAND HILL ROAD, SUITE 100 MENLO PARK CA 94025 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 Class B Ordinary Shares, par value $0.0001 per share 2023-01-17 4 J 0 4234172 D Class A Ordinary Shares, par value $0.0001 per share 4234172 3464323 I See footnotes The Class B Ordinary Shares are convertible into Class A Ordinary Shares of the Issuer's on a one-for-one basis, subject to adjustment pursuant to certain anti-dilution rights, and have no expiration date. The Reporting Persons' Class B Ordinary Shares are convertible into Class A Ordinary Shares as described under the heading "Description of Securities-Founder Shares" in the Issuer's registration statement on Form S-1 (File No. 333- 254259). Pursuant to the Letter Agreement, by and among the Reporting Person, the Issuer, Decarbonization Plus Acquisition Sponsor IV LLC, a Cayman Islands limited liability company and the other holders of Class B Ordinary Shares, dated September 25, 2022 (the "Letter Agreement"), the Reporting Person agreed to assign and transfer 55% of the Class B Ordinary Shares acquired by the Reporting Person in connection with the Issuer's initial public offering to Riverstone Global Energy and Power Fund V (Cayman), L.P. ("Fund V"), Riverstone V Investment Management Cooperatief U.A. or a wholly-owned subsidiary thereof prior to the closing of the proposed business combination between Hammerhead Resources Inc., an Alberta corporation and the Issuer. On January 17, 2023, pursuant to the Letter Agreement, the Reporting Person transferred 4,234,172 Class B Ordinary Shares to R5 HHR FS Holdings LLC, a Delaware limited liability company and wholly-owned subsidiary of Fund V. Decarbonization Plus Acquisition Sponsor IV LLC is the record holder of the securities reported herein. David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Holdings LLC, which controls Decarbonization Plus Acquisition Sponsor IV LLC. Each of Riverstone Holdings LLC, Mr. Leuschen and Mr. Lapeyre, Jr. may be deemed to have or share beneficial ownership of the securities held directly by Decarbonization Plus Acquisition Sponsor IV 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 IV LLC, /s/ Peter Haskopoulos, Managing Director 2023-01-18 Riverstone Holdings LLC, /s/ Peter Haskopoulos, Authorized Person 2023-01-18 David M. Leuschen, /s/ Peter Haskopoulos, Attorney-in-fact 2023-01-18 Pierre F. Lapeyre, Jr., /s/ Peter Haskopoulos, Attorney-in-fact 2023-01-18