OPAL

SEC source: 0001213900-22-041365 · ownership.xml · derivative · entry 4

Comora Mark S · CIK 0001827111 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Through OPAL HoldCo LLC

Disclosed balance after: 142,377,450

Underlying: Class C Common Stock · 142,377,450 shares

Expires not disclosed

F5 · derivative.exercise_price: The Class B Common Units of OPAL Fuels LLC are redeemable at any time by the Reporting Person for, at the election of the Issuer, newly-issued Class C common stock on a one-for-one basis or a cash payment equal to the volume weighted average market price of one Class C common stock for each Class B Common Unit redeemed. Upon the redemption of any Class B Common Units, a number of Class D common stock equal to the number of Class B Common Units that are redeemed will be cancelled by the Issuer for no consideration.

F6 · kind: Represents Class B Common Units received as consideration for common units of OPAL Fuels LLC in connection with the Business Combination Agreement.

F5 · derivative.exercise_date: The Class B Common Units of OPAL Fuels LLC are redeemable at any time by the Reporting Person for, at the election of the Issuer, newly-issued Class C common stock on a one-for-one basis or a cash payment equal to the volume weighted average market price of one Class C common stock for each Class B Common Unit redeemed. Upon the redemption of any Class B Common Units, a number of Class D common stock equal to the number of Class B Common Units that are redeemed will be cancelled by the Issuer for no consideration.

F5 · derivative.expiration_date: The Class B Common Units of OPAL Fuels LLC are redeemable at any time by the Reporting Person for, at the election of the Issuer, newly-issued Class C common stock on a one-for-one basis or a cash payment equal to the volume weighted average market price of one Class C common stock for each Class B Common Unit redeemed. Upon the redemption of any Class B Common Units, a number of Class D common stock equal to the number of Class B Common Units that are redeemed will be cancelled by the Issuer for no consideration.

SEC source: 0001213900-22-041365 · ownership.xml · nonDerivative · entry 3

Comora Mark S · CIK 0001827111 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Through Hillman RNG Investments, LLC

Disclosed balance after: 145,279,637

F2 · shares: The reported amount of shares of Class D Common Stock were received as consideration in connection with the Business Combination Agreement, as defined in the Issuer's prospectus filed with the Securities and Exchange Commission on June 27, 2022 (the "Business Combination Agreement"), with the number of such shares of Class D common stock equal to the number of Class B Common Units of OPAL Fuels LLC received by the reporting person as consideration for common units of OPAL Fuels LLC in connection with the Business Combination Agreement. Shares of Class D Common Stock have no economic value but entitle the holder thereof to five votes per share for each share of Class D Common Stock held of record by such holder on all matters on which stockholders generally are entitled to vote. The Issuer is the managing member of OPAL Fuels LLC, a Delaware limited liability company, which directly or indirectly holds substantially all of the consolidated assets and business of the Issuer.

F4 · shares: The reported amount of shares of Class D Common Stock consists of 2,021,587 shares of Class D Common Stock owned of record by Hillman RNG Investments, LLC ("Hillman"), but excludes an aggregate of 137,127 shares of Class D Common Stock potentially issuable to Hillman in connection with the First Earnout Tranche and Second Earnout Tranche. Mr. Comora controls Hillman through Fortistar and certain of its subsidiaries and affiliates. Accordingly, the reporting person is deemed to have beneficial ownership of the securities held by Hillman.

SEC source: 0001213900-22-041365 · ownership.xml · nonDerivative · entry 2

Comora Mark S · CIK 0001827111 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Through OPAL HoldCo LLC

Disclosed balance after: 143,258,050

F2 · shares: The reported amount of shares of Class D Common Stock were received as consideration in connection with the Business Combination Agreement, as defined in the Issuer's prospectus filed with the Securities and Exchange Commission on June 27, 2022 (the "Business Combination Agreement"), with the number of such shares of Class D common stock equal to the number of Class B Common Units of OPAL Fuels LLC received by the reporting person as consideration for common units of OPAL Fuels LLC in connection with the Business Combination Agreement. Shares of Class D Common Stock have no economic value but entitle the holder thereof to five votes per share for each share of Class D Common Stock held of record by such holder on all matters on which stockholders generally are entitled to vote. The Issuer is the managing member of OPAL Fuels LLC, a Delaware limited liability company, which directly or indirectly holds substantially all of the consolidated assets and business of the Issuer.

F3 · shares: The reported amount of shares of Class D Common Stock consists of 142,377,450 shares of Class D Common Stock owned of record by OPAL HoldCo LLC ("OPAL HoldCo"), but excludes an aggregate of 9,657,625 shares of Class D Common Stock potentially issuable to OPAL HoldCo in connection with the First Earnout Tranche and Second Earnout Tranche, as described in the Issuer's prospectus filed with the Securities and Exchange Commission on June 27, 2022 (File No. 333-262583) (the "First Earnout Tranche" and the "Second Earnout Tranche"). Mr. Comora controls OPAL HoldCo through Fortistar and certain of its subsidiaries and affiliates. Accordingly, the reporting person is deemed to have beneficial ownership of the securities held by OPAL Holdco.

SEC source: 0001213900-22-041365 · ownership.xml · nonDerivative · entry 1

Comora Mark S · CIK 0001827111 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Through Fortistar LLC

Disclosed balance after: 880,600

F1 · shares: The reported amount of shares of Class A Common Stock were purchased by Fortistar LLC ("Fortistar") for a purchase price of $10.00 per share, pursuant to the terms of that certain Subscription Agreement, dated December 2, 2021, between ArcLight Clean Transition Corp. II and Fortistar. Each holder of Class A Common Stock will be entitled to one vote for each share of Class A Common Stock held of record by such holder on all matters on which stockholders generally are entitled to vote. Mr. Comora controls Fortistar as its President and Sole Member and he is deemed to have beneficial ownership of the securities held by Fortistar.

SEC source: 0001213900-22-041414 · ownership.xml · derivative · entry 4

ArcLight CTC Holdings II, L.P. · CIK 0001842317 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,223,261

Underlying: Class A Common Stock · 9,223,261 shares

Expires not disclosed

F3 · derivative.exercise_price: In connection with the consummation of the Business Combination, 9,223,261 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of New OPAL (each a "New OPAL Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New OPAL Private Placement Warrant entitling the holder thereof to the right to purchase one share of New OPAL Common Stock.

F3 · kind: In connection with the consummation of the Business Combination, 9,223,261 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of New OPAL (each a "New OPAL Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New OPAL Private Placement Warrant entitling the holder thereof to the right to purchase one share of New OPAL Common Stock.

F3 · price: In connection with the consummation of the Business Combination, 9,223,261 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of New OPAL (each a "New OPAL Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New OPAL Private Placement Warrant entitling the holder thereof to the right to purchase one share of New OPAL Common Stock.

F3 · derivative.exercise_date: In connection with the consummation of the Business Combination, 9,223,261 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of New OPAL (each a "New OPAL Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New OPAL Private Placement Warrant entitling the holder thereof to the right to purchase one share of New OPAL Common Stock.

F3 · derivative.expiration_date: In connection with the consummation of the Business Combination, 9,223,261 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of New OPAL (each a "New OPAL Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New OPAL Private Placement Warrant entitling the holder thereof to the right to purchase one share of New OPAL Common Stock.

F3 · derivative.underlying_shares: In connection with the consummation of the Business Combination, 9,223,261 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of New OPAL (each a "New OPAL Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New OPAL Private Placement Warrant entitling the holder thereof to the right to purchase one share of New OPAL Common Stock.

F3 · balance_after: In connection with the consummation of the Business Combination, 9,223,261 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of New OPAL (each a "New OPAL Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New OPAL Private Placement Warrant entitling the holder thereof to the right to purchase one share of New OPAL Common Stock.

F1 · ownership.direct: 9,639,076 shares of common stock, par value $0.0001 ("New OPAL Common Stock"), of New OPAL (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by the Sponsor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

F3 · ownership.direct: In connection with the consummation of the Business Combination, 9,223,261 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of New OPAL (each a "New OPAL Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New OPAL Private Placement Warrant entitling the holder thereof to the right to purchase one share of New OPAL Common Stock.

SEC source: 0001213900-22-041414 · ownership.xml · derivative · entry 3

ArcLight CTC Holdings II, L.P. · CIK 0001842317 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,223,261

Underlying: Class A Ordinary Shares · 9,223,261 shares

Expires not disclosed

F3 · derivative.exercise_price: In connection with the consummation of the Business Combination, 9,223,261 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of New OPAL (each a "New OPAL Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New OPAL Private Placement Warrant entitling the holder thereof to the right to purchase one share of New OPAL Common Stock.

F3 · kind: In connection with the consummation of the Business Combination, 9,223,261 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of New OPAL (each a "New OPAL Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New OPAL Private Placement Warrant entitling the holder thereof to the right to purchase one share of New OPAL Common Stock.

F3 · price: In connection with the consummation of the Business Combination, 9,223,261 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of New OPAL (each a "New OPAL Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New OPAL Private Placement Warrant entitling the holder thereof to the right to purchase one share of New OPAL Common Stock.

F3 · derivative.exercise_date: In connection with the consummation of the Business Combination, 9,223,261 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of New OPAL (each a "New OPAL Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New OPAL Private Placement Warrant entitling the holder thereof to the right to purchase one share of New OPAL Common Stock.

F3 · derivative.expiration_date: In connection with the consummation of the Business Combination, 9,223,261 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of New OPAL (each a "New OPAL Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New OPAL Private Placement Warrant entitling the holder thereof to the right to purchase one share of New OPAL Common Stock.

F3 · derivative.underlying_shares: In connection with the consummation of the Business Combination, 9,223,261 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of New OPAL (each a "New OPAL Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New OPAL Private Placement Warrant entitling the holder thereof to the right to purchase one share of New OPAL Common Stock.

F3 · balance_after: In connection with the consummation of the Business Combination, 9,223,261 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of New OPAL (each a "New OPAL Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New OPAL Private Placement Warrant entitling the holder thereof to the right to purchase one share of New OPAL Common Stock.

F1 · ownership.direct: 9,639,076 shares of common stock, par value $0.0001 ("New OPAL Common Stock"), of New OPAL (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by the Sponsor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

F3 · ownership.direct: In connection with the consummation of the Business Combination, 9,223,261 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of New OPAL (each a "New OPAL Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New OPAL Private Placement Warrant entitling the holder thereof to the right to purchase one share of New OPAL Common Stock.

SEC source: 0001213900-22-041414 · ownership.xml · derivative · entry 2

ArcLight CTC Holdings II, L.P. · CIK 0001842317 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 7,639,076 shares

Expires not disclosed

F2 · derivative.exercise_price: Pursuant to the Business Combination, dated December 2, 2021, by and among ArcLight Clean Transition Corp. II, a Cayman Islands exempted company (the "Company"), OPAL Fuels LLC, a Delaware limited liability company ("OPAL Fuels"), and OPAL HoldCo LLC, a Delaware limited liability company ("OPAL HoldCo"), the parties effected a business combination transaction ("Business Combination"), on July 21, 2022. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "OPAL Fules Inc." ("New OPAL"). In connection with the consummation of the Business Combination and the Domestication, 7,639,076 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New OPAL ("New OPAL Common Stock") simultaneously with the closing of the Business Combination.

F2 · kind: Pursuant to the Business Combination, dated December 2, 2021, by and among ArcLight Clean Transition Corp. II, a Cayman Islands exempted company (the "Company"), OPAL Fuels LLC, a Delaware limited liability company ("OPAL Fuels"), and OPAL HoldCo LLC, a Delaware limited liability company ("OPAL HoldCo"), the parties effected a business combination transaction ("Business Combination"), on July 21, 2022. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "OPAL Fules Inc." ("New OPAL"). In connection with the consummation of the Business Combination and the Domestication, 7,639,076 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New OPAL ("New OPAL Common Stock") simultaneously with the closing of the Business Combination.

F2 · price: Pursuant to the Business Combination, dated December 2, 2021, by and among ArcLight Clean Transition Corp. II, a Cayman Islands exempted company (the "Company"), OPAL Fuels LLC, a Delaware limited liability company ("OPAL Fuels"), and OPAL HoldCo LLC, a Delaware limited liability company ("OPAL HoldCo"), the parties effected a business combination transaction ("Business Combination"), on July 21, 2022. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "OPAL Fules Inc." ("New OPAL"). In connection with the consummation of the Business Combination and the Domestication, 7,639,076 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New OPAL ("New OPAL Common Stock") simultaneously with the closing of the Business Combination.

F2 · derivative.exercise_date: Pursuant to the Business Combination, dated December 2, 2021, by and among ArcLight Clean Transition Corp. II, a Cayman Islands exempted company (the "Company"), OPAL Fuels LLC, a Delaware limited liability company ("OPAL Fuels"), and OPAL HoldCo LLC, a Delaware limited liability company ("OPAL HoldCo"), the parties effected a business combination transaction ("Business Combination"), on July 21, 2022. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "OPAL Fules Inc." ("New OPAL"). In connection with the consummation of the Business Combination and the Domestication, 7,639,076 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New OPAL ("New OPAL Common Stock") simultaneously with the closing of the Business Combination.

F2 · derivative.expiration_date: Pursuant to the Business Combination, dated December 2, 2021, by and among ArcLight Clean Transition Corp. II, a Cayman Islands exempted company (the "Company"), OPAL Fuels LLC, a Delaware limited liability company ("OPAL Fuels"), and OPAL HoldCo LLC, a Delaware limited liability company ("OPAL HoldCo"), the parties effected a business combination transaction ("Business Combination"), on July 21, 2022. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "OPAL Fules Inc." ("New OPAL"). In connection with the consummation of the Business Combination and the Domestication, 7,639,076 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New OPAL ("New OPAL Common Stock") simultaneously with the closing of the Business Combination.

F3 · derivative.underlying_shares: In connection with the consummation of the Business Combination, 9,223,261 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of New OPAL (each a "New OPAL Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New OPAL Private Placement Warrant entitling the holder thereof to the right to purchase one share of New OPAL Common Stock.

F2 · balance_after: Pursuant to the Business Combination, dated December 2, 2021, by and among ArcLight Clean Transition Corp. II, a Cayman Islands exempted company (the "Company"), OPAL Fuels LLC, a Delaware limited liability company ("OPAL Fuels"), and OPAL HoldCo LLC, a Delaware limited liability company ("OPAL HoldCo"), the parties effected a business combination transaction ("Business Combination"), on July 21, 2022. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "OPAL Fules Inc." ("New OPAL"). In connection with the consummation of the Business Combination and the Domestication, 7,639,076 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New OPAL ("New OPAL Common Stock") simultaneously with the closing of the Business Combination.

F1 · ownership.direct: 9,639,076 shares of common stock, par value $0.0001 ("New OPAL Common Stock"), of New OPAL (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by the Sponsor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

F2 · ownership.direct: Pursuant to the Business Combination, dated December 2, 2021, by and among ArcLight Clean Transition Corp. II, a Cayman Islands exempted company (the "Company"), OPAL Fuels LLC, a Delaware limited liability company ("OPAL Fuels"), and OPAL HoldCo LLC, a Delaware limited liability company ("OPAL HoldCo"), the parties effected a business combination transaction ("Business Combination"), on July 21, 2022. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "OPAL Fules Inc." ("New OPAL"). In connection with the consummation of the Business Combination and the Domestication, 7,639,076 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New OPAL ("New OPAL Common Stock") simultaneously with the closing of the Business Combination.

SEC source: 0001213900-22-041414 · ownership.xml · nonDerivative · entry 1

ArcLight CTC Holdings II, L.P. · CIK 0001842317 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,639,076

F2 · price: Pursuant to the Business Combination, dated December 2, 2021, by and among ArcLight Clean Transition Corp. II, a Cayman Islands exempted company (the "Company"), OPAL Fuels LLC, a Delaware limited liability company ("OPAL Fuels"), and OPAL HoldCo LLC, a Delaware limited liability company ("OPAL HoldCo"), the parties effected a business combination transaction ("Business Combination"), on July 21, 2022. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "OPAL Fules Inc." ("New OPAL"). In connection with the consummation of the Business Combination and the Domestication, 7,639,076 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New OPAL ("New OPAL Common Stock") simultaneously with the closing of the Business Combination.

F1 · ownership.direct: 9,639,076 shares of common stock, par value $0.0001 ("New OPAL Common Stock"), of New OPAL (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by the Sponsor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

F2 · ownership.direct: Pursuant to the Business Combination, dated December 2, 2021, by and among ArcLight Clean Transition Corp. II, a Cayman Islands exempted company (the "Company"), OPAL Fuels LLC, a Delaware limited liability company ("OPAL Fuels"), and OPAL HoldCo LLC, a Delaware limited liability company ("OPAL HoldCo"), the parties effected a business combination transaction ("Business Combination"), on July 21, 2022. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "OPAL Fules Inc." ("New OPAL"). In connection with the consummation of the Business Combination and the Domestication, 7,639,076 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New OPAL ("New OPAL Common Stock") simultaneously with the closing of the Business Combination.

SEC source: 0000899243-21-018956 · doc4.xml · derivative · entry 1

Revers Daniel R · CIK 0001405456 · Director · Chairman · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By ArcLight CTC Holdings II, L.P.

Disclosed balance after: 6,920,326

Underlying: Class A ordinary shares · 127,174 shares

Expires not disclosed

F1 · derivative.exercise_price: This Form 4 reflects the surrender to the issuer of 127,174 of the issuer's Class B ordinary shares, par value $0.0001 per share, for no consideration by ArcLight CTC Holdings II, L.P.'s ("Sponsor") as a result of the Sponsor's participation in the issuer's initial public offering, as more fully described in the issuer's registration statement on Form S-1 (File No. 333-252730).

F1 · kind: This Form 4 reflects the surrender to the issuer of 127,174 of the issuer's Class B ordinary shares, par value $0.0001 per share, for no consideration by ArcLight CTC Holdings II, L.P.'s ("Sponsor") as a result of the Sponsor's participation in the issuer's initial public offering, as more fully described in the issuer's registration statement on Form S-1 (File No. 333-252730).

F2 · price: As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F2 · derivative.exercise_date: As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F2 · derivative.expiration_date: As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F3 · ownership.direct: The securities reported herein are held directly by the Sponsor. The reporting person has voting and investment discretion with respect to the securities held by the the Sponsor. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose.

SEC source: 0000899243-21-018957 · doc4.xml · derivative · entry 1

ArcLight CTC Holdings II, L.P. · CIK 0001842317 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,920,326

Underlying: Class A ordinary shares · 127,174 shares

Expires not disclosed

F1 · derivative.exercise_price: This Form 4 reflects the surrender to the issuer of 127,174 of the issuer's Class B ordinary shares, par value $0.0001 per share, for no consideration by the reporting person as a result of its participation in the issuer's initial public offering, as more fully described in the issuer's registration statement on Form S-1 (File No. 333-252730).

F1 · kind: This Form 4 reflects the surrender to the issuer of 127,174 of the issuer's Class B ordinary shares, par value $0.0001 per share, for no consideration by the reporting person as a result of its participation in the issuer's initial public offering, as more fully described in the issuer's registration statement on Form S-1 (File No. 333-252730).

F2 · price: As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F2 · derivative.exercise_date: As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F2 · derivative.expiration_date: As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F3 · ownership.direct: This Form 4 is being filed by the reporting person. The reporting person is controlled by Daniel R. Revers.

SEC source: 0000899243-22-004660 · doc4a.xml · derivative · entry 1

Revers Daniel R · CIK 0001405456 · Director · Chairman · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By ArcLight CTC Holdings II, L.P.

Disclosed balance after: 7,639,076

Underlying: Class A ordinary shares · 127,174 shares

Expires not disclosed

F1 · derivative.exercise_price: This Form 4 reflects the surrender to the issuer of 127,174 of the issuer's Class B ordinary shares, par value $0.0001 per share, for no consideration by ArcLight CTC Holdings II, L.P.'s ("Sponsor") as a result of the Sponsor's participation in the issuer's initial public offering, as more fully described in the issuer's registration statement on Form S-1 (File No. 333-252730).

F1 · kind: This Form 4 reflects the surrender to the issuer of 127,174 of the issuer's Class B ordinary shares, par value $0.0001 per share, for no consideration by ArcLight CTC Holdings II, L.P.'s ("Sponsor") as a result of the Sponsor's participation in the issuer's initial public offering, as more fully described in the issuer's registration statement on Form S-1 (File No. 333-252730).

F2 · price: As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F2 · derivative.exercise_date: As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F2 · derivative.expiration_date: As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F3 · ownership.direct: The securities reported herein are held directly by the Sponsor. The reporting person has voting and investment discretion with respect to the securities held by the the Sponsor. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose.

SEC source: 0000899243-22-004659 · doc4a.xml · derivative · entry 1

ArcLight CTC Holdings II, L.P. · CIK 0001842317 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,639,076

Underlying: Class A ordinary shares · 127,174 shares

Expires not disclosed

F1 · derivative.exercise_price: This Form 4 reflects the surrender to the issuer of 127,174 of the issuer's Class B ordinary shares, par value $0.0001 per share, for no consideration by the reporting person as a result of its participation in the issuer's initial public offering, as more fully described in the issuer's registration statement on Form S-1 (File No. 333-252730).

F1 · kind: This Form 4 reflects the surrender to the issuer of 127,174 of the issuer's Class B ordinary shares, par value $0.0001 per share, for no consideration by the reporting person as a result of its participation in the issuer's initial public offering, as more fully described in the issuer's registration statement on Form S-1 (File No. 333-252730).

F2 · price: As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F2 · derivative.exercise_date: As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F2 · derivative.expiration_date: As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F3 · ownership.direct: This Form 4 is being filed by the reporting person. The reporting person is controlled by Daniel R. Revers.