RIVERSTONE HOLDINGS LLC

SEC source: 0001104659-24-126822 · tm2430488-3_4seq1.xml · nonDerivative · entry 1

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

F1 · price: On March 12, 2024, Enviva Inc., a Delaware corporation (the "Issuer") and certain subsidiaries of the Company (collectively, the "Debtors") filed voluntary petitions for reorganization under Chapter 11 of Title 11 of the United States Code in the United States Bankruptcy Court for the Eastern District of Virginia (the "Bankruptcy Court"). The Issuer also filed motions with the Bankruptcy Court seeking joint administration of the Debtors' cases under the caption In re Enviva Inc., et al., Case No. 24-10453 (the "Chapter 11 Cases").On December 6, 2024 (the "Effective Date"), the Bankruptcy Court entered an order confirming the Debtors' Amended and Restated Joint Chapter 11 Plan of Reorganization of Enviva Inc. and Its Debtor Affiliates, dated as of October 4, 2024 (the "Plan"), the Plan became effective in accordance with its terms, and the Debtors emerged from the Chapter 11 Cases.

F2 · price: On the Effective Date, pursuant to the terms of the Plan, the Issuer's common stock, including any options, warrants, restricted stock units, and any other rights or agreements to acquire such common stock, outstanding immediately before the Effective Date was canceled, released, discharged, and extinguished.

F3 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C. ("Riverstone Management"), and had or shared voting and investment discretion with respect to the securities beneficially owned by Riverstone Management, which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P., which is the sole member of Riverstone Holdings LLC, which is the sole member of Riverstone Echo GP, LLC, which is the general partner of Riverstone Echo Partners, L.P., which is the sole member of each of Riverstone ECF GP, LLC ("ECF GP") and Riverstone Echo Rollover GP, LLC ("Echo Rollover GP").

F4 · ownership.nature: ECF GP is the general partner of each of Echo Continuation Holdings and PF Holdings. Echo Rollover GP is the general partner of Echo Rollover Holdings. As a result of these relationships, each of these entities and individuals may be deemed to have had or shared beneficial ownership of the securities held of record by Echo Continuation Holdings, Echo Rollover Holdings, and PF Holdings. Each such entity or person disclaims beneficial ownership of such securities except to the extent of their respective pecuniary interest therein.

SEC source: 0001104659-23-128324 · tm2333461-2_4seq1.xml · nonDerivative · entry 1

REL US Centennial Holdings, LLC · CIK 0001692660 · Director · 10% owner · Former 10% Owner

REL IP General Partner LP · CIK 0001692835 · Director · 10% owner

REL IP General Partner Ltd · CIK 0001692862 · Director · 10% owner

Riverstone Energy Ltd Investment Holdings, LP · CIK 0001693264 · Director · 10% owner

Riverstone Holdings II (Cayman) Ltd. · CIK 0001693263 · Director · 10% owner

Riverstone VI Centennial QB Holdings, L.P. · CIK 0001692648 · Director · 10% owner

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 52,596,969

F1 · ownership.nature: Following the transactions reported herein, includes 10,052,173 shares held of record by REL US Centennial Holdings, LLC ("REL US"), 36,137,046 shares held of record by Riverstone VI Centennial QB Holdings, L.P. ("Riverstone QB Holdings"), 3,632,581 shares held of record by Riverstone Non-ECI USRPI AIV, L.P. ("Riverstone Non-ECI"), 1,932,221 shares held of record by Silver Run Sponsor, LLC ("Silver Run Sponsor") and 842,948 shares held of record by David M. Leuschen.

F2 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C. ("Riverstone Management"), which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Holdings") and the sole shareholder of Riverstone Holdings II (Cayman) Ltd. ("Holdings II").

F3 · ownership.nature: Holdings is the sole shareholder of Riverstone Energy GP VI Corp., which is the managing member of Riverstone Energy GP VI, LLC, which is the general partner of Riverstone Energy Partners VI, L.P., which is the general partner Riverstone QB Holdings. As such, each of Messrs. Leuschen and Lapeyre, Riverstone Management, Riverstone/Gower, Holdings, Riverstone Energy GP VI Corp, Riverstone Energy GP VI, LLC and Riverstone Energy Partners VI, L.P. may be deemed to share beneficial ownership of the securities held of record by Riverstone QB Holdings. 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.

F4 · ownership.nature: Holdings is also the managing member of Silver Run Sponsor Manager, LLC, which is the managing member of Silver Run Sponsor. As such, each of Messrs. Leuschen and Lapeyre, Riverstone Management, Riverstone/Gower, Holdings and Silver Run Sponsor Manager, LLC may be deemed to share beneficial ownership of the securities held of record by Silver Run Sponsor. Each such person or entity disclaims beneficial ownership of these securities except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any such person or entity is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.

F5 · ownership.nature: Holdings II is the general partner of Riverstone Energy Limited Investment Holdings, LP, which is the sole shareholder of REL IP General Partner Limited, which is the general partner of REL IP General Partner LP, which is the managing member of REL US. Each of Messrs. Leuschen and Lapeyre, Riverstone Management, Riverstone/Gower, Holdings II, Riverstone Energy Limited Investment Holdings, LP, REL IP General Partner Limited and REL IP General Partner LP may be deemed to share beneficial ownership of the securities held of record by REL US. Each such person or entity disclaims beneficial ownership of these securities except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any such person or entity is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.

F6 · ownership.nature: Riverstone Non-ECI GP Ltd. is the sole member of Riverstone Non-ECI Cayman GP LLC, which is the general partner of Riverstone Non-ECI Partners GP (Cayman), L.P., which is the sole member of Riverstone Non-ECI USRPI AIV GP, L.L.C., which is the general partner of Riverstone Non-ECI. Riverstone Non-ECI GP Ltd. is managed by Mr. Leuschen and Mr. Lapeyre. As such, each of Messrs. Leuschen and Lapeyre, Riverstone Non-ECI GP Ltd., Riverstone Non-ECI Cayman GP LLC, Riverstone Non-ECI Partners GP (Cayman), L.P., and Riverstone Non-ECI USRPI AIV GP, L.L.C. may be deemed to share beneficial ownership of the securities held of record by Riverstone Non-ECI. Each such person or entity disclaims beneficial ownership of these securities except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any such person or entity is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.

SEC source: 0000950170-23-065288 · ownership.xml · derivative · entry 1

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · 10% owner

RCP II F1 GP, L.L.C. · CIK 0001999273 · 10% owner

RCP F1 GP, L.L.C. · CIK 0001999272 · 10% owner

RCP Strategic Credit Partners (A) GP, L.L.C. · CIK 0001999266 · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 1,000,000

Underlying: Common Stock · 1,000,000 shares

Expires not disclosed

F1 · derivative.exercise_price: On November 17, 2023, each of Riverstone Credit Partners - Direct, L.P. ("Riverstone Credit Partners") and Riverstone Credit Partners II - Direct, L.P. ("Riverstone Credit Partners II" and together with Riverstone Credit Partners, the "Riverstone Sellers") entered into a variable share forward transaction (the "Transactions") with an unaffiliated bank (the "Bank") pursuant to a Master Terms and Conditions for Variable Share Forward Transactions entered into between such Riverstone Seller and the Bank, dated November 17, 2023 (the "Agreement"), relating to up to an aggregate of 1,000,000 shares of common stock of the Issuer ("Common Stock") and obligating the Riverstone Sellers to deliver to the Bank cash to settle the Transactions as further described below. The Riverstone Sellers pledged a volume of shares of Common Stock (the "Pledged Shares")

F2 · derivative.exercise_price: (Continued from footnote 1) equal to the number of shares subject to the Transactions to secure their obligations under the Agreement and retained voting and ordinary dividend rights in the Pledged Shares during the term of the pledge, subject to certain payments the Riverstone Sellers may need to make to the Bank with respect to dividends under the terms of the Agreement. Under the Agreement, on the relevant settlement date for each of the 30 components, which have valuation dates beginning June 3, 2024 and ending June 24, 2024, the amount of cash to be delivered to the Bank is to be determined as follows: (a) if the volume weighted average price per share of Common Stock on the relevant valuation date (the "Settlement Price") is less than or equal to a floor price equal to 90.00% of the volume weighted average price per share of Common Stock at which the Bank establishes its initial hedge position during a hedging period (the "Floor Price"),

F3 · derivative.exercise_price: (Continued from footnote 2) the Bank will deliver to the Riverstone Sellers an amount of cash equal to the Settlement Price minus the Floor Price, multiplied by the number of shares subject to the component; (b) if the Settlement Price is greater than the Floor Price but less than or equal to a cap price equal to 112.50% of the volume weighted average price per Common Stock at which the Bank establishes its initial hedge position during a hedging period (the "Cap Price"), no payment of cash will be made by either party; and (c) if the Settlement Price is greater than the Cap Price, the Riverstone Sellers will deliver to the Bank an amount of cash equal to the Settlement Price minus the Cap Price, multiplied by the number of shares subject to the component.

F1 · kind: On November 17, 2023, each of Riverstone Credit Partners - Direct, L.P. ("Riverstone Credit Partners") and Riverstone Credit Partners II - Direct, L.P. ("Riverstone Credit Partners II" and together with Riverstone Credit Partners, the "Riverstone Sellers") entered into a variable share forward transaction (the "Transactions") with an unaffiliated bank (the "Bank") pursuant to a Master Terms and Conditions for Variable Share Forward Transactions entered into between such Riverstone Seller and the Bank, dated November 17, 2023 (the "Agreement"), relating to up to an aggregate of 1,000,000 shares of common stock of the Issuer ("Common Stock") and obligating the Riverstone Sellers to deliver to the Bank cash to settle the Transactions as further described below. The Riverstone Sellers pledged a volume of shares of Common Stock (the "Pledged Shares")

F2 · kind: (Continued from footnote 1) equal to the number of shares subject to the Transactions to secure their obligations under the Agreement and retained voting and ordinary dividend rights in the Pledged Shares during the term of the pledge, subject to certain payments the Riverstone Sellers may need to make to the Bank with respect to dividends under the terms of the Agreement. Under the Agreement, on the relevant settlement date for each of the 30 components, which have valuation dates beginning June 3, 2024 and ending June 24, 2024, the amount of cash to be delivered to the Bank is to be determined as follows: (a) if the volume weighted average price per share of Common Stock on the relevant valuation date (the "Settlement Price") is less than or equal to a floor price equal to 90.00% of the volume weighted average price per share of Common Stock at which the Bank establishes its initial hedge position during a hedging period (the "Floor Price"),

F3 · kind: (Continued from footnote 2) the Bank will deliver to the Riverstone Sellers an amount of cash equal to the Settlement Price minus the Floor Price, multiplied by the number of shares subject to the component; (b) if the Settlement Price is greater than the Floor Price but less than or equal to a cap price equal to 112.50% of the volume weighted average price per Common Stock at which the Bank establishes its initial hedge position during a hedging period (the "Cap Price"), no payment of cash will be made by either party; and (c) if the Settlement Price is greater than the Cap Price, the Riverstone Sellers will deliver to the Bank an amount of cash equal to the Settlement Price minus the Cap Price, multiplied by the number of shares subject to the component.

F1 · price: On November 17, 2023, each of Riverstone Credit Partners - Direct, L.P. ("Riverstone Credit Partners") and Riverstone Credit Partners II - Direct, L.P. ("Riverstone Credit Partners II" and together with Riverstone Credit Partners, the "Riverstone Sellers") entered into a variable share forward transaction (the "Transactions") with an unaffiliated bank (the "Bank") pursuant to a Master Terms and Conditions for Variable Share Forward Transactions entered into between such Riverstone Seller and the Bank, dated November 17, 2023 (the "Agreement"), relating to up to an aggregate of 1,000,000 shares of common stock of the Issuer ("Common Stock") and obligating the Riverstone Sellers to deliver to the Bank cash to settle the Transactions as further described below. The Riverstone Sellers pledged a volume of shares of Common Stock (the "Pledged Shares")

F2 · price: (Continued from footnote 1) equal to the number of shares subject to the Transactions to secure their obligations under the Agreement and retained voting and ordinary dividend rights in the Pledged Shares during the term of the pledge, subject to certain payments the Riverstone Sellers may need to make to the Bank with respect to dividends under the terms of the Agreement. Under the Agreement, on the relevant settlement date for each of the 30 components, which have valuation dates beginning June 3, 2024 and ending June 24, 2024, the amount of cash to be delivered to the Bank is to be determined as follows: (a) if the volume weighted average price per share of Common Stock on the relevant valuation date (the "Settlement Price") is less than or equal to a floor price equal to 90.00% of the volume weighted average price per share of Common Stock at which the Bank establishes its initial hedge position during a hedging period (the "Floor Price"),

F3 · price: (Continued from footnote 2) the Bank will deliver to the Riverstone Sellers an amount of cash equal to the Settlement Price minus the Floor Price, multiplied by the number of shares subject to the component; (b) if the Settlement Price is greater than the Floor Price but less than or equal to a cap price equal to 112.50% of the volume weighted average price per Common Stock at which the Bank establishes its initial hedge position during a hedging period (the "Cap Price"), no payment of cash will be made by either party; and (c) if the Settlement Price is greater than the Cap Price, the Riverstone Sellers will deliver to the Bank an amount of cash equal to the Settlement Price minus the Cap Price, multiplied by the number of shares subject to the component.

F1 · derivative.exercise_date: On November 17, 2023, each of Riverstone Credit Partners - Direct, L.P. ("Riverstone Credit Partners") and Riverstone Credit Partners II - Direct, L.P. ("Riverstone Credit Partners II" and together with Riverstone Credit Partners, the "Riverstone Sellers") entered into a variable share forward transaction (the "Transactions") with an unaffiliated bank (the "Bank") pursuant to a Master Terms and Conditions for Variable Share Forward Transactions entered into between such Riverstone Seller and the Bank, dated November 17, 2023 (the "Agreement"), relating to up to an aggregate of 1,000,000 shares of common stock of the Issuer ("Common Stock") and obligating the Riverstone Sellers to deliver to the Bank cash to settle the Transactions as further described below. The Riverstone Sellers pledged a volume of shares of Common Stock (the "Pledged Shares")

F2 · derivative.exercise_date: (Continued from footnote 1) equal to the number of shares subject to the Transactions to secure their obligations under the Agreement and retained voting and ordinary dividend rights in the Pledged Shares during the term of the pledge, subject to certain payments the Riverstone Sellers may need to make to the Bank with respect to dividends under the terms of the Agreement. Under the Agreement, on the relevant settlement date for each of the 30 components, which have valuation dates beginning June 3, 2024 and ending June 24, 2024, the amount of cash to be delivered to the Bank is to be determined as follows: (a) if the volume weighted average price per share of Common Stock on the relevant valuation date (the "Settlement Price") is less than or equal to a floor price equal to 90.00% of the volume weighted average price per share of Common Stock at which the Bank establishes its initial hedge position during a hedging period (the "Floor Price"),

F3 · derivative.exercise_date: (Continued from footnote 2) the Bank will deliver to the Riverstone Sellers an amount of cash equal to the Settlement Price minus the Floor Price, multiplied by the number of shares subject to the component; (b) if the Settlement Price is greater than the Floor Price but less than or equal to a cap price equal to 112.50% of the volume weighted average price per Common Stock at which the Bank establishes its initial hedge position during a hedging period (the "Cap Price"), no payment of cash will be made by either party; and (c) if the Settlement Price is greater than the Cap Price, the Riverstone Sellers will deliver to the Bank an amount of cash equal to the Settlement Price minus the Cap Price, multiplied by the number of shares subject to the component.

F1 · derivative.expiration_date: On November 17, 2023, each of Riverstone Credit Partners - Direct, L.P. ("Riverstone Credit Partners") and Riverstone Credit Partners II - Direct, L.P. ("Riverstone Credit Partners II" and together with Riverstone Credit Partners, the "Riverstone Sellers") entered into a variable share forward transaction (the "Transactions") with an unaffiliated bank (the "Bank") pursuant to a Master Terms and Conditions for Variable Share Forward Transactions entered into between such Riverstone Seller and the Bank, dated November 17, 2023 (the "Agreement"), relating to up to an aggregate of 1,000,000 shares of common stock of the Issuer ("Common Stock") and obligating the Riverstone Sellers to deliver to the Bank cash to settle the Transactions as further described below. The Riverstone Sellers pledged a volume of shares of Common Stock (the "Pledged Shares")

F2 · derivative.expiration_date: (Continued from footnote 1) equal to the number of shares subject to the Transactions to secure their obligations under the Agreement and retained voting and ordinary dividend rights in the Pledged Shares during the term of the pledge, subject to certain payments the Riverstone Sellers may need to make to the Bank with respect to dividends under the terms of the Agreement. Under the Agreement, on the relevant settlement date for each of the 30 components, which have valuation dates beginning June 3, 2024 and ending June 24, 2024, the amount of cash to be delivered to the Bank is to be determined as follows: (a) if the volume weighted average price per share of Common Stock on the relevant valuation date (the "Settlement Price") is less than or equal to a floor price equal to 90.00% of the volume weighted average price per share of Common Stock at which the Bank establishes its initial hedge position during a hedging period (the "Floor Price"),

F3 · derivative.expiration_date: (Continued from footnote 2) the Bank will deliver to the Riverstone Sellers an amount of cash equal to the Settlement Price minus the Floor Price, multiplied by the number of shares subject to the component; (b) if the Settlement Price is greater than the Floor Price but less than or equal to a cap price equal to 112.50% of the volume weighted average price per Common Stock at which the Bank establishes its initial hedge position during a hedging period (the "Cap Price"), no payment of cash will be made by either party; and (c) if the Settlement Price is greater than the Cap Price, the Riverstone Sellers will deliver to the Bank an amount of cash equal to the Settlement Price minus the Cap Price, multiplied by the number of shares subject to the component.

F4 · ownership.nature: RCP II F1 GP, L.L.C. is the sole general partner of RCP II F2 GP, L.P., which is the sole general partner of Riverstone Credit Partners II. RCP F1 GP, L.L.C. is the sole general partner of RCP F2 GP, L.P., which is the sole general partner of Riverstone Credit Partners. RCP Strategic Credit Partners (A) GP, L.L.C. is the sole general partner of RCP Strategic Credit Partners (A-2) GP, L.P., which is the is the sole general partner of Riverstone Strategic Credit Partners A-2 AIV, L.P. ("Riverstone Strategic Credit Partners"). Riverstone Maple Investor, LLC ("Maple Investor") is managed by Riverstone Credit Partners II, Riverstone Credit Partners and Riverstone Strategic Credit Partners, and Maple Investor is the sole member of Maple Energy Holdings, LLC ("Maple"). David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C. ("Riverstone Management")

F5 · ownership.nature: (Continued from footnote 4) and have or share voting and investment discretion with respect to the securities beneficially owned by Riverstone Management, which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P., which is the sole member of Riverstone Holdings LLC, which is the sole member of RCP II F1 GP, L.L.C., RCP F1 GP, L.L.C. and RCP Strategic Credit Partners (A) GP, L.L.C. As a result of these relationships, each of these entities and individuals may be deemed to have or share beneficial ownership of the securities held of record by Maple, and each of these entities and individuals (other than Maple Investor and Maple) may be deemed to have or share beneficial ownership of the securities held of record by Riverstone Credit Partners II, Riverstone Credit Partners and Riverstone Strategic Credit Partners. Each such entity or person disclaims beneficial ownership of such securities except to the extent of their respective pecuniary interest therein.

SEC source: 0000950170-23-063258 · ownership.xml · derivative · entry 1

Agriculture & Natural Solutions Acquisition Sponsor LLC · CIK 0001854166 · 10% owner

Agriculture & Natural Solutions Acquisition Sponsor Holdings V, LLC · CIK 0002000568 · 10% owner

Agriculture & Natural Solutions Acquisition Sponsor Manager V, LLC · CIK 0002000566 · 10% owner

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 8,225,000

Underlying: Class A Ordinary Shares, par value $0.0001 per share · 200,000 shares

Expires not disclosed

F1 · derivative.exercise_price: The Class B Ordinary Shares are automatically convertible into the Issuer's Class A Ordinary Shares at the time of the Issuer's initial business combination on a one-for-one basis, subject to adjustment pursuant to certain anti-dilution rights, and have no expiration date.

F2 · kind: In connection with the Issuer's initial public offering and the appointment of Ted Hall to the Issuer's Board of Directors, Agriculture & Natural Solutions Acquisition Sponsor LLC surrendered for no consideration 200,000 Class B Ordinary Shares to the Issuer and the Issuer issued 200,000 Class B Ordinary Shares to Ted Hall.

F2 · price: In connection with the Issuer's initial public offering and the appointment of Ted Hall to the Issuer's Board of Directors, Agriculture & Natural Solutions Acquisition Sponsor LLC surrendered for no consideration 200,000 Class B Ordinary Shares to the Issuer and the Issuer issued 200,000 Class B Ordinary Shares to Ted Hall.

F1 · derivative.exercise_date: The Class B Ordinary Shares are automatically convertible into the Issuer's Class A Ordinary Shares at the time of the Issuer's initial business combination on a one-for-one basis, subject to adjustment pursuant to certain anti-dilution rights, and have no expiration date.

F1 · derivative.expiration_date: The Class B Ordinary Shares are automatically convertible into the Issuer's Class A Ordinary Shares at the time of the Issuer's initial business combination on a one-for-one basis, subject to adjustment pursuant to certain anti-dilution rights, and have no expiration date.

F3 · ownership.nature: Agriculture & Natural Solutions Acquisition Sponsor LLC is the record holder of the shares reported herein. David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Holdings LLC, which is the sole and managing member of Agriculture & Natural Solutions Acquisition Sponsor Manager, LLC. Agriculture & Natural Solutions Acquisition Sponsor Manager, LLC is the managing member of Agriculture & Natural Solutions Acquisition Sponsor Holdings, LLC. Agriculture & Natural Solutions Acquisition Sponsor Holdings, LLC is the sole and managing member of Agriculture & Natural Solutions Acquisition Sponsor LLC.

F4 · ownership.nature: Each of Agriculture & Natural Solutions Acquisition Sponsor Holdings, LLC, Agriculture & Natural Solutions Acquisition Sponsor Manager, LLC, Riverstone Holdings LLC, Mr. Leuschen and Mr. Lapeyre may be deemed to have or share beneficial ownership of the ordinary shares held directly by Agriculture & Natural Solutions Acquisition Sponsor 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.

SEC source: 0001104659-23-073036 · tm2319164-1_4seq1.xml · derivative · entry 2

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 3,977,723 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each share of Series A Preferred Stock ("Preferred Share") was convertible into one share of Common Stock of the Issuer, subject to adjustment for any stock dividends, splits, combinations and similar events. The conversion of the Preferred Shares to shares of Common Stock of the Issuer occurred automatically on June 15, 2023 upon stockholder approval of a proposal to issue Common Stock upon conversion of the Preferred Shares for purposes of Rule 312.03 of the New York Stock Exchange Listed Company Manual.

F2 · derivative.exercise_date: Each share of Series A Preferred Stock ("Preferred Share") was convertible into one share of Common Stock of the Issuer, subject to adjustment for any stock dividends, splits, combinations and similar events. The conversion of the Preferred Shares to shares of Common Stock of the Issuer occurred automatically on June 15, 2023 upon stockholder approval of a proposal to issue Common Stock upon conversion of the Preferred Shares for purposes of Rule 312.03 of the New York Stock Exchange Listed Company Manual.

F2 · derivative.expiration_date: Each share of Series A Preferred Stock ("Preferred Share") was convertible into one share of Common Stock of the Issuer, subject to adjustment for any stock dividends, splits, combinations and similar events. The conversion of the Preferred Shares to shares of Common Stock of the Issuer occurred automatically on June 15, 2023 upon stockholder approval of a proposal to issue Common Stock upon conversion of the Preferred Shares for purposes of Rule 312.03 of the New York Stock Exchange Listed Company Manual.

F3 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C. ("Riverstone Management"), and have or share voting and investment discretion with respect to the securities beneficially owned by Riverstone Management, which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P., which is the sole member of Riverstone Holdings LLC, which is the sole member of Riverstone Echo GP, LLC, which is the general partner of Riverstone Echo Partners, L.P., which is the sole member of each of Riverstone ECF GP, LLC ("ECF GP") and Riverstone Echo Rollover GP, LLC ("Echo Rollover GP").

F4 · ownership.nature: ECF GP is the general partner of each of Echo Continuation Holdings and PF Holdings. Echo Rollover GP is the general partner of Echo Rollover Holdings. As a result of these relationships, each of these entities and individuals may be deemed to have or share beneficial ownership of the securities held of record by Echo Continuation Holdings, Echo Rollover Holdings, and PF Holdings. Each such entity or person disclaims beneficial ownership of such securities except to the extent of their respective pecuniary interest therein.

SEC source: 0001104659-23-073036 · tm2319164-1_4seq1.xml · nonDerivative · entry 1

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 32,416,420

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Includes 1,969,002 shares of Common Stock, par value $0.001 (the "Common Stock"), of Enviva Inc. (the "Issuer") held by Riverstone Echo Continuation Holdings, L.P. ("Echo Continuation Holdings"), 267,869 shares of Common Stock held by Riverstone Echo Rollover Holdings, L.P. ("Echo Rollover Holdings"), and 1,740,852 shares of Common Stock held by Riverstone Echo PF Holdings, L.P. ("PF Holdings").

F2 · price: Each share of Series A Preferred Stock ("Preferred Share") was convertible into one share of Common Stock of the Issuer, subject to adjustment for any stock dividends, splits, combinations and similar events. The conversion of the Preferred Shares to shares of Common Stock of the Issuer occurred automatically on June 15, 2023 upon stockholder approval of a proposal to issue Common Stock upon conversion of the Preferred Shares for purposes of Rule 312.03 of the New York Stock Exchange Listed Company Manual.

F3 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C. ("Riverstone Management"), and have or share voting and investment discretion with respect to the securities beneficially owned by Riverstone Management, which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P., which is the sole member of Riverstone Holdings LLC, which is the sole member of Riverstone Echo GP, LLC, which is the general partner of Riverstone Echo Partners, L.P., which is the sole member of each of Riverstone ECF GP, LLC ("ECF GP") and Riverstone Echo Rollover GP, LLC ("Echo Rollover GP").

F4 · ownership.nature: ECF GP is the general partner of each of Echo Continuation Holdings and PF Holdings. Echo Rollover GP is the general partner of Echo Rollover Holdings. As a result of these relationships, each of these entities and individuals may be deemed to have or share beneficial ownership of the securities held of record by Echo Continuation Holdings, Echo Rollover Holdings, and PF Holdings. Each such entity or person disclaims beneficial ownership of such securities except to the extent of their respective pecuniary interest therein.

SEC source: 0001104659-23-032272 · tm239335-2_4seq1.xml · nonDerivative · entry 1

REL US Centennial Holdings, LLC · CIK 0001692660 · Director · 10% owner

REL IP General Partner LP · CIK 0001692835 · Director · 10% owner

REL IP General Partner Ltd · CIK 0001692862 · Director · 10% owner

Riverstone Energy Ltd Investment Holdings, LP · CIK 0001693264 · Director · 10% owner

Riverstone Holdings II (Cayman) Ltd. · CIK 0001693263 · Director · 10% owner

Riverstone VI Centennial QB Holdings, L.P. · CIK 0001692648 · Director · 10% owner

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 58,227,600

F1 · ownership.nature: Following the transactions reported herein, includes 10,052,173 shares held of record by REL US Centennial Holdings, LLC ("REL US"), 41,084,578 shares held of record by Riverstone VI Centennial QB Holdings, L.P. ("Riverstone QB Holdings"), 4,129,918 shares held of record by Riverstone Non-ECI USRPI AIV, L.P. ("Riverstone Non-ECI"), 2,006,422 shares held of record by Silver Run Sponsor, LLC ("Silver Run Sponsor") and 954,509 shares held of record by David M. Leuschen.

F2 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C. ("Riverstone Management"), which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Holdings") and the sole shareholder of Riverstone Holdings II (Cayman) Ltd. ("Holdings II").

F3 · ownership.nature: Holdings is the sole shareholder of Riverstone Energy GP VI Corp., which is the managing member of Riverstone Energy GP VI, LLC, which is the general partner of Riverstone Energy Partners VI, L.P., which is the general partner Riverstone QB Holdings. As such, each of Messrs. Leuschen and Lapeyre, Riverstone Management, Riverstone/Gower, Holdings, Riverstone Energy GP VI Corp, Riverstone Energy GP VI, LLC and Riverstone Energy Partners VI, L.P. may be deemed to share beneficial ownership of the securities held of record by Riverstone QB Holdings. 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.

F4 · ownership.nature: Holdings is also the managing member of Silver Run Sponsor Manager, LLC, which is the managing member of Silver Run Sponsor. As such, each of Messrs. Leuschen and Lapeyre, Riverstone Management, Riverstone/Gower, Holdings and Silver Run Sponsor Manager, LLC may be deemed to share beneficial ownership of the securities held of record by Silver Run Sponsor. Each such person or entity disclaims beneficial ownership of these securities except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any such person or entity is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.

F5 · ownership.nature: Holdings II is the general partner of Riverstone Energy Limited Investment Holdings, LP, which is the sole shareholder of REL IP General Partner Limited, which is the general partner of REL IP General Partner LP, which is the managing member of REL US. Each of Messrs. Leuschen and Lapeyre, Riverstone Management, Riverstone/Gower, Holdings II, Riverstone Energy Limited Investment Holdings, LP, REL IP General Partner Limited and REL IP General Partner LP may be deemed to share beneficial ownership of the securities held of record by REL US. Each such person or entity disclaims beneficial ownership of these securities except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any such person or entity is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.

F6 · ownership.nature: Riverstone Non-ECI GP Ltd. is the sole member of Riverstone Non-ECI Cayman GP LLC, which is the general partner of Riverstone Non-ECI Partners GP (Cayman), L.P., which is the sole member of Riverstone Non-ECI USRPI AIV GP, L.L.C., which is the general partner of Riverstone Non-ECI. Riverstone Non-ECI GP Ltd. is managed by Mr. Leuschen and Mr. Lapeyre. As such, each of Messrs. Leuschen and Lapeyre, Riverstone Non-ECI GP Ltd., Riverstone Non-ECI Cayman GP LLC, Riverstone Non-ECI Partners GP (Cayman), L.P., and Riverstone Non-ECI USRPI AIV GP, L.L.C. may be deemed to share beneficial ownership of the securities held of record by Riverstone Non-ECI. Each such person or entity disclaims beneficial ownership of these securities except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any such person or entity is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.

SEC source: 0001104659-23-028580 · tm238530-5_4seq1.xml · derivative · entry 1

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 3,977,723

Underlying: Common Stock · 3,977,723 shares

Expires not disclosed

F1 · derivative.exercise_price: Each share of Series A Preferred Stock ("Preferred Share") is convertible into one share of Common Stock of Enviva Inc. (the "Issuer"), subject to adjustment for any stock dividends, splits, combinations and similar events.

F2 · derivative.exercise_price: Includes 3,977,723 Preferred Shares purchased pursuant to three separate subscription agreements, dated February 28, 2023, by and between the Issuer and Riverstone Echo Continuation Holdings, L.P. ("Echo Continuation Holdings"), Riverstone Echo Rollover Holdings, L.P. ("Echo Rollover Holdings"), and Riverstone Echo PF Holdings, L.P. ("PF Holdings"), respectively, of which 1,969,002 Preferred Shares were purchased by Echo Continuation Holdings, 267,869 Preferred Shares were purchased by Echo Rollover Holdings, and 1,740,852 Preferred Shares were purchased by PF Holdings.

F1 · shares: Each share of Series A Preferred Stock ("Preferred Share") is convertible into one share of Common Stock of Enviva Inc. (the "Issuer"), subject to adjustment for any stock dividends, splits, combinations and similar events.

F2 · shares: Includes 3,977,723 Preferred Shares purchased pursuant to three separate subscription agreements, dated February 28, 2023, by and between the Issuer and Riverstone Echo Continuation Holdings, L.P. ("Echo Continuation Holdings"), Riverstone Echo Rollover Holdings, L.P. ("Echo Rollover Holdings"), and Riverstone Echo PF Holdings, L.P. ("PF Holdings"), respectively, of which 1,969,002 Preferred Shares were purchased by Echo Continuation Holdings, 267,869 Preferred Shares were purchased by Echo Rollover Holdings, and 1,740,852 Preferred Shares were purchased by PF Holdings.

F3 · derivative.exercise_date: The conversion of the Preferred Shares to shares of Common Stock of the Issuer is subject to and will occur automatically upon stockholder approval of a proposal to issue Common Stock upon conversion of the Preferred Shares for purposes of Rule 312.03 of the New York Stock Exchange Listed Company Manual.

F3 · derivative.expiration_date: The conversion of the Preferred Shares to shares of Common Stock of the Issuer is subject to and will occur automatically upon stockholder approval of a proposal to issue Common Stock upon conversion of the Preferred Shares for purposes of Rule 312.03 of the New York Stock Exchange Listed Company Manual.

F1 · derivative.underlying_shares: Each share of Series A Preferred Stock ("Preferred Share") is convertible into one share of Common Stock of Enviva Inc. (the "Issuer"), subject to adjustment for any stock dividends, splits, combinations and similar events.

F2 · derivative.underlying_shares: Includes 3,977,723 Preferred Shares purchased pursuant to three separate subscription agreements, dated February 28, 2023, by and between the Issuer and Riverstone Echo Continuation Holdings, L.P. ("Echo Continuation Holdings"), Riverstone Echo Rollover Holdings, L.P. ("Echo Rollover Holdings"), and Riverstone Echo PF Holdings, L.P. ("PF Holdings"), respectively, of which 1,969,002 Preferred Shares were purchased by Echo Continuation Holdings, 267,869 Preferred Shares were purchased by Echo Rollover Holdings, and 1,740,852 Preferred Shares were purchased by PF Holdings.

F1 · balance_after: Each share of Series A Preferred Stock ("Preferred Share") is convertible into one share of Common Stock of Enviva Inc. (the "Issuer"), subject to adjustment for any stock dividends, splits, combinations and similar events.

F2 · balance_after: Includes 3,977,723 Preferred Shares purchased pursuant to three separate subscription agreements, dated February 28, 2023, by and between the Issuer and Riverstone Echo Continuation Holdings, L.P. ("Echo Continuation Holdings"), Riverstone Echo Rollover Holdings, L.P. ("Echo Rollover Holdings"), and Riverstone Echo PF Holdings, L.P. ("PF Holdings"), respectively, of which 1,969,002 Preferred Shares were purchased by Echo Continuation Holdings, 267,869 Preferred Shares were purchased by Echo Rollover Holdings, and 1,740,852 Preferred Shares were purchased by PF Holdings.

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C. ("Riverstone Management"), and have or share voting and investment discretion with respect to the securities beneficially owned by Riverstone Management, which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P., which is the sole member of Riverstone Holdings LLC, which is the sole member of Riverstone Echo GP, LLC, which is the general partner of Riverstone Echo Partners, L.P., which is the sole member of each of Riverstone ECF GP, LLC ("ECF GP") and Riverstone Echo Rollover GP, LLC ("Echo Rollover GP").

F5 · ownership.nature: ECF GP is the general partner of each of Echo Continuation Holdings and PF Holdings. Echo Rollover GP is the general partner of Echo Rollover Holdings. As a result of these relationships, each of these entities and individuals may be deemed to have or share beneficial ownership of the securities held of record by Echo Continuation Holdings, Echo Rollover Holdings, and PF Holdings. Each such entity or person disclaims beneficial ownership of such securities except to the extent of their respective pecuniary interest therein.

SEC source: 0001104659-23-026843 · tm235339-25_4seq1.xml · nonDerivative · entry 1

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 28,438,697

F1 · shares: Includes 176,245 shares of the Issuer's Common Stock, par value $0.001 per share (the "Common Stock") issued in respect of reinvested dividends pursuant to the Support Agreement, dated October 14, 2021, by and among Enviva Partners, LP, the persons set forth on Schedule I attached thereto and the other parties named therein (the "Support Agreement") on February 24, 2023 of which 85,114 shares were issued to Riverstone Echo Continuation Holdings, L.P. ("Echo Continuation Holdings"), 15,879 shares were issued to Riverstone Echo Rollover Holdings, L.P. ("Echo Rollover Holdings"), and 75,252 shares were issued to Riverstone Echo PF Holdings, L.P. ("PF Holdings").

F2 · price: Issued in connection with each reporting person's obligation to reinvest quarterly cash dividends pursuant to the Support Agreement, to which the reporting persons are parties.

F3 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C. ("Riverstone Management"), and have or share voting and investment discretion with respect to the securities beneficially owned by Riverstone Management, which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P., which is the sole member of Riverstone Holdings LLC, which is the sole member of Riverstone Echo GP, LLC, which is the general partner of Riverstone Echo Partners, L.P., which is the sole member of each of Riverstone ECF GP, LLC ("ECF GP") and Riverstone Echo Rollover GP, LLC ("Echo Rollover GP").

F4 · ownership.nature: ECF GP is the general partner of each of Echo Continuation Holdings and PF Holdings. Echo Rollover GP is the general partner of Echo Rollover Holdings. As a result of these relationships, each of these entities and individuals may be deemed to have or share beneficial ownership of the securities held of record by Echo Continuation Holdings, Echo Rollover Holdings, and PF Holdings. Each such entity or person disclaims beneficial ownership of such securities except to the extent of their respective pecuniary interest therein.

SEC source: 0000899243-23-005888 · doc4.xml · derivative · entry 1

Decarbonization Plus Acquisition Sponsor IV LLC · CIK 0001848961 · 10% owner

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Class A Common Shares · 3,464,323 shares

Expires not disclosed

F1 · derivative.exercise_price: In connection with the closing of the business combination (the "Business Combination") between Decarbonization Plus Acquisition Corporation IV ("DCRD"), Hammerhead Resources Inc., an Alberta corporation ("Hammerhead"), Hammerhead Energy Inc., an Alberta corporation and wholly owned subsidiary of Hammerhead ("NewCo"), and 2453729 Alberta ULC, an Alberta unlimited liability corporation and wholly owned subsidiary of DCRD, on February 21, 2023, DCRD transferred by way of continuation from the Cayman Islands to the Province of Alberta, Canada in accordance with the Cayman Islands Companies Act (as amended) and domesticated as an Alberta corporation in accordance with the applicable provisions of the Business Corporations Act (Alberta) (such transfer by way of continuation and domestication, the "Domestication").

F2 · derivative.exercise_price: (Continued from footnote 1) Pursuant to the Domestication, each Class B ordinary share of DCRD was exchanged for one Class B common share of DCRD ("DCRD Class B Common Share"). Following the Domestication, on February 22, 2023, DCRD amalgamated with NewCo (the "SPAC Amalgamation") to form one corporate entity ("New SPAC") with NewCo surviving the SPAC Amalgamation as New SPAC. Pursuant to the SPAC Amalgamation, each DCRD Class B Common Share issued and outstanding immediately prior to the effective time of the SPAC Amalgamation was exchanged, on a one-for-one basis, for a Class B common share in the authorized share capital of New SPAC.

F1 · price: In connection with the closing of the business combination (the "Business Combination") between Decarbonization Plus Acquisition Corporation IV ("DCRD"), Hammerhead Resources Inc., an Alberta corporation ("Hammerhead"), Hammerhead Energy Inc., an Alberta corporation and wholly owned subsidiary of Hammerhead ("NewCo"), and 2453729 Alberta ULC, an Alberta unlimited liability corporation and wholly owned subsidiary of DCRD, on February 21, 2023, DCRD transferred by way of continuation from the Cayman Islands to the Province of Alberta, Canada in accordance with the Cayman Islands Companies Act (as amended) and domesticated as an Alberta corporation in accordance with the applicable provisions of the Business Corporations Act (Alberta) (such transfer by way of continuation and domestication, the "Domestication").

F2 · price: (Continued from footnote 1) Pursuant to the Domestication, each Class B ordinary share of DCRD was exchanged for one Class B common share of DCRD ("DCRD Class B Common Share"). Following the Domestication, on February 22, 2023, DCRD amalgamated with NewCo (the "SPAC Amalgamation") to form one corporate entity ("New SPAC") with NewCo surviving the SPAC Amalgamation as New SPAC. Pursuant to the SPAC Amalgamation, each DCRD Class B Common Share issued and outstanding immediately prior to the effective time of the SPAC Amalgamation was exchanged, on a one-for-one basis, for a Class B common share in the authorized share capital of New SPAC.

F1 · derivative.exercise_date: In connection with the closing of the business combination (the "Business Combination") between Decarbonization Plus Acquisition Corporation IV ("DCRD"), Hammerhead Resources Inc., an Alberta corporation ("Hammerhead"), Hammerhead Energy Inc., an Alberta corporation and wholly owned subsidiary of Hammerhead ("NewCo"), and 2453729 Alberta ULC, an Alberta unlimited liability corporation and wholly owned subsidiary of DCRD, on February 21, 2023, DCRD transferred by way of continuation from the Cayman Islands to the Province of Alberta, Canada in accordance with the Cayman Islands Companies Act (as amended) and domesticated as an Alberta corporation in accordance with the applicable provisions of the Business Corporations Act (Alberta) (such transfer by way of continuation and domestication, the "Domestication").

F2 · derivative.exercise_date: (Continued from footnote 1) Pursuant to the Domestication, each Class B ordinary share of DCRD was exchanged for one Class B common share of DCRD ("DCRD Class B Common Share"). Following the Domestication, on February 22, 2023, DCRD amalgamated with NewCo (the "SPAC Amalgamation") to form one corporate entity ("New SPAC") with NewCo surviving the SPAC Amalgamation as New SPAC. Pursuant to the SPAC Amalgamation, each DCRD Class B Common Share issued and outstanding immediately prior to the effective time of the SPAC Amalgamation was exchanged, on a one-for-one basis, for a Class B common share in the authorized share capital of New SPAC.

F1 · derivative.expiration_date: In connection with the closing of the business combination (the "Business Combination") between Decarbonization Plus Acquisition Corporation IV ("DCRD"), Hammerhead Resources Inc., an Alberta corporation ("Hammerhead"), Hammerhead Energy Inc., an Alberta corporation and wholly owned subsidiary of Hammerhead ("NewCo"), and 2453729 Alberta ULC, an Alberta unlimited liability corporation and wholly owned subsidiary of DCRD, on February 21, 2023, DCRD transferred by way of continuation from the Cayman Islands to the Province of Alberta, Canada in accordance with the Cayman Islands Companies Act (as amended) and domesticated as an Alberta corporation in accordance with the applicable provisions of the Business Corporations Act (Alberta) (such transfer by way of continuation and domestication, the "Domestication").

F2 · derivative.expiration_date: (Continued from footnote 1) Pursuant to the Domestication, each Class B ordinary share of DCRD was exchanged for one Class B common share of DCRD ("DCRD Class B Common Share"). Following the Domestication, on February 22, 2023, DCRD amalgamated with NewCo (the "SPAC Amalgamation") to form one corporate entity ("New SPAC") with NewCo surviving the SPAC Amalgamation as New SPAC. Pursuant to the SPAC Amalgamation, each DCRD Class B Common Share issued and outstanding immediately prior to the effective time of the SPAC Amalgamation was exchanged, on a one-for-one basis, for a Class B common share in the authorized share capital of New SPAC.

F3 · ownership.nature: 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.

F4 · ownership.nature: 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.

SEC source: 0000899243-23-002004 · doc4.xml · derivative · entry 1

Decarbonization Plus Acquisition Sponsor IV LLC · CIK 0001848961 · 10% owner

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 3,464,323

Underlying: Class A Ordinary Shares, par value $0.0001 per share · 4,234,172 shares

Expires not disclosed

F1 · derivative.exercise_price: 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).

F1 · price: 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).

F2 · price: 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.

F1 · derivative.exercise_date: 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).

F1 · derivative.expiration_date: 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).

F3 · ownership.nature: 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.

F4 · ownership.nature: 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.

SEC source: 0001104659-23-022020 · tm236709-1_5seq1.xml · nonDerivative · entry 4

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 28,262,452

F4 · shares: Includes 146,747 shares of Common Stock issued in respect of reinvested dividends pursuant to the Support Agreement on November 25, 2022 of which 70,868 shares were issued to Echo Continuation Holdings, 13,222 shares were issued to Echo Rollover Holdings, and 62,657 shares were issued to PF Holdings.

F5 · price: Issued in connection with each reporting person's obligations to reinvest quarterly cash dividends pursuant to the Support Agreement, to which the reporting persons are parties.

F6 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C. ("Riverstone Management"), and have or share voting and investment discretion with respect to the securities beneficially owned by Riverstone Management, which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P., which is the sole member of Riverstone Holdings LLC, which is the sole member of Riverstone Echo GP, LLC, which is the general partner of Riverstone Echo Partners, L.P., which is the sole member of each of Riverstone ECF GP, LLC ("ECF GP") and Riverstone Echo Rollover GP, LLC ("Echo Rollover GP").

F7 · ownership.nature: ECF GP is the general partner of each of Echo Continuation Holdings and PF Holdings. Echo Rollover GP is the general partner of Echo Rollover Holdings. As a result of these relationships, each of these entities and individuals may be deemed to have or share beneficial ownership of the securities held of record by Echo Continuation Holdings, Echo Rollover Holdings, and PF Holdings. Each such entity or person disclaims beneficial ownership of such securities except to the extent of their respective pecuniary interest therein.

SEC source: 0001104659-23-022020 · tm236709-1_5seq1.xml · nonDerivative · entry 3

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 28,262,452

F3 · shares: Includes 116,438 shares of Common Stock issued in respect of reinvested dividends pursuant to the Support Agreement on August 26, 2022 of which 56,231 shares were issued to Echo Continuation Holdings, 10,491 shares were issued to Echo Rollover Holdings, and 49,716 shares were issued to PF Holdings.

F5 · price: Issued in connection with each reporting person's obligations to reinvest quarterly cash dividends pursuant to the Support Agreement, to which the reporting persons are parties.

F6 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C. ("Riverstone Management"), and have or share voting and investment discretion with respect to the securities beneficially owned by Riverstone Management, which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P., which is the sole member of Riverstone Holdings LLC, which is the sole member of Riverstone Echo GP, LLC, which is the general partner of Riverstone Echo Partners, L.P., which is the sole member of each of Riverstone ECF GP, LLC ("ECF GP") and Riverstone Echo Rollover GP, LLC ("Echo Rollover GP").

F7 · ownership.nature: ECF GP is the general partner of each of Echo Continuation Holdings and PF Holdings. Echo Rollover GP is the general partner of Echo Rollover Holdings. As a result of these relationships, each of these entities and individuals may be deemed to have or share beneficial ownership of the securities held of record by Echo Continuation Holdings, Echo Rollover Holdings, and PF Holdings. Each such entity or person disclaims beneficial ownership of such securities except to the extent of their respective pecuniary interest therein.

SEC source: 0001104659-22-073060 · tm2217400-13_4seq1.xml · nonDerivative · entry 2

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 12,291,914

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.005 to $20.36. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 8,342,678 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 767,416 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,752,555 shares held of record by ILX Holdings II, LLC ("ILX II"), and 429,265 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-073060 · tm2217400-13_4seq1.xml · nonDerivative · entry 1

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 12,302,444

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.00 to $20.76. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 8,342,678 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 767,416 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,752,555 shares held of record by ILX Holdings II, LLC ("ILX II"), and 429,265 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-071935 · tm2217400-11_4seq1.xml · nonDerivative · entry 6

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 12,475,187

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.00 to $22.08. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 8,467,068 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 778,858 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,793,595 shares held of record by ILX Holdings II, LLC ("ILX II"), and 435,666 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-071935 · tm2217400-11_4seq1.xml · nonDerivative · entry 5

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 12,482,819

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.00 to $21.995. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 8,467,068 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 778,858 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,793,595 shares held of record by ILX Holdings II, LLC ("ILX II"), and 435,666 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-071935 · tm2217400-11_4seq1.xml · nonDerivative · entry 4

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 12,590,068

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.80 to $20.995. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 8,467,068 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 778,858 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,793,595 shares held of record by ILX Holdings II, LLC ("ILX II"), and 435,666 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-071935 · tm2217400-11_4seq1.xml · nonDerivative · entry 3

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 12,593,168

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F3 · ownership.nature: Following the transactions reported herein, includes 8,467,068 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 778,858 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,793,595 shares held of record by ILX Holdings II, LLC ("ILX II"), and 435,666 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-071935 · tm2217400-11_4seq1.xml · nonDerivative · entry 2

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 12,593,468

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.00 to $22.99. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 8,467,068 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 778,858 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,793,595 shares held of record by ILX Holdings II, LLC ("ILX II"), and 435,666 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-071935 · tm2217400-11_4seq1.xml · nonDerivative · entry 1

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 12,691,900

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.14 to $21.99. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 8,467,068 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 778,858 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,793,595 shares held of record by ILX Holdings II, LLC ("ILX II"), and 435,666 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-071027 · tm2217400-7_4seq1.xml · nonDerivative · entry 5

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 12,781,417

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.00 to $23.015. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 8,674,910 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 797,977 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,862,170 shares held of record by ILX Holdings II, LLC ("ILX II"), and 446,360 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-071027 · tm2217400-7_4seq1.xml · nonDerivative · entry 4

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 12,781,597

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.00 to $22.98. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 8,674,910 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 797,977 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,862,170 shares held of record by ILX Holdings II, LLC ("ILX II"), and 446,360 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-071027 · tm2217400-7_4seq1.xml · nonDerivative · entry 3

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 12,848,970

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.38 to $21.995. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 8,674,910 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 797,977 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,862,170 shares held of record by ILX Holdings II, LLC ("ILX II"), and 446,360 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-071027 · tm2217400-7_4seq1.xml · nonDerivative · entry 2

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 12,908,470

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.00 to $24.50. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 8,674,910 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 797,977 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,862,170 shares held of record by ILX Holdings II, LLC ("ILX II"), and 446,360 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-071027 · tm2217400-7_4seq1.xml · nonDerivative · entry 1

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 12,925,699

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.05 to $23.99. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 8,674,910 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 797,977 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,862,170 shares held of record by ILX Holdings II, LLC ("ILX II"), and 446,360 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-070155 · tm2216164-3_4seq1.xml · nonDerivative · entry 4

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 13,008,908

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.00 to $24.65. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 8,829,311 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 812,180 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,913,112 shares held of record by ILX Holdings II, LLC ("ILX II"), and 454,305 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-070155 · tm2216164-3_4seq1.xml · nonDerivative · entry 3

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 13,094,136

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.46 to $23.995. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 8,829,311 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 812,180 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,913,112 shares held of record by ILX Holdings II, LLC ("ILX II"), and 454,305 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-070155 · tm2216164-3_4seq1.xml · nonDerivative · entry 2

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 13,125,973

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.00 to $25.49. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 8,829,311 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 812,180 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,913,112 shares held of record by ILX Holdings II, LLC ("ILX II"), and 454,305 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-070155 · tm2216164-3_4seq1.xml · nonDerivative · entry 1

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 13,155,637

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.11 to $24.995. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 8,829,311 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 812,180 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,913,112 shares held of record by ILX Holdings II, LLC ("ILX II"), and 454,305 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-068558 · tm2217400-5_4seq1.xml · nonDerivative · entry 2

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 13,295,898

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.00 to $23.13. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 9,024,094 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 830,098 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,977,379 shares held of record by ILX Holdings II, LLC ("ILX II"), and 464,327 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-068558 · tm2217400-5_4seq1.xml · nonDerivative · entry 1

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 13,304,429

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.01 to $22.97. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 9,024,094 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 830,098 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,977,379 shares held of record by ILX Holdings II, LLC ("ILX II"), and 464,327 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-067643 · tm2217400-3_4seq1.xml · nonDerivative · entry 5

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 13,366,923

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.00 to $23.205. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 9,072,292 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 834,536 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,993,286 shares held of record by ILX Holdings II, LLC ("ILX II"), and 466,809 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-067643 · tm2217400-3_4seq1.xml · nonDerivative · entry 4

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 13,401,286

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.00 to $22.99. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 9,072,292 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 834,536 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,993,286 shares held of record by ILX Holdings II, LLC ("ILX II"), and 466,809 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-067643 · tm2217400-3_4seq1.xml · nonDerivative · entry 3

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 13,671,116

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F3 · ownership.nature: Following the transactions reported herein, includes 9,072,292 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 834,536 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,993,286 shares held of record by ILX Holdings II, LLC ("ILX II"), and 466,809 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-067643 · tm2217400-3_4seq1.xml · nonDerivative · entry 2

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 13,671,216

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.00 to $22.96. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 9,072,292 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 834,536 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,993,286 shares held of record by ILX Holdings II, LLC ("ILX II"), and 466,809 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-067643 · tm2217400-3_4seq1.xml · nonDerivative · entry 1

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 13,752,574

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.27 to $21.995. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 9,072,292 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 834,536 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 2,993,286 shares held of record by ILX Holdings II, LLC ("ILX II"), and 466,809 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-066749 · tm2217400-1_4seq1.xml · nonDerivative · entry 4

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 13,831,116

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.01 to $22.52. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 9,387,346 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 863,517 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 3,097,234 shares held of record by ILX Holdings II, LLC ("ILX II"), and 483,019 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-066749 · tm2217400-1_4seq1.xml · nonDerivative · entry 3

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 13,964,143

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.645 to $21.95. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 9,387,346 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 863,517 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 3,097,234 shares held of record by ILX Holdings II, LLC ("ILX II"), and 483,019 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-23-022020 · tm236709-1_5seq1.xml · nonDerivative · entry 2

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 28,262,452

F2 · shares: Includes 98,042 shares of Common Stock issued in respect of reinvested dividends pursuant to the Support Agreement on May 27, 2022 of which 47,347 shares were issued to Echo Continuation Holdings, 8,834 shares were issued to Echo Rollover Holdings, and 41,861 shares were issued to PF Holdings.

F5 · price: Issued in connection with each reporting person's obligations to reinvest quarterly cash dividends pursuant to the Support Agreement, to which the reporting persons are parties.

F6 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C. ("Riverstone Management"), and have or share voting and investment discretion with respect to the securities beneficially owned by Riverstone Management, which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P., which is the sole member of Riverstone Holdings LLC, which is the sole member of Riverstone Echo GP, LLC, which is the general partner of Riverstone Echo Partners, L.P., which is the sole member of each of Riverstone ECF GP, LLC ("ECF GP") and Riverstone Echo Rollover GP, LLC ("Echo Rollover GP").

F7 · ownership.nature: ECF GP is the general partner of each of Echo Continuation Holdings and PF Holdings. Echo Rollover GP is the general partner of Echo Rollover Holdings. As a result of these relationships, each of these entities and individuals may be deemed to have or share beneficial ownership of the securities held of record by Echo Continuation Holdings, Echo Rollover Holdings, and PF Holdings. Each such entity or person disclaims beneficial ownership of such securities except to the extent of their respective pecuniary interest therein.

SEC source: 0001104659-22-066749 · tm2217400-1_4seq1.xml · nonDerivative · entry 2

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 13,968,622

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.00 to $22.26. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 9,387,346 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 863,517 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 3,097,234 shares held of record by ILX Holdings II, LLC ("ILX II"), and 483,019 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-066749 · tm2217400-1_4seq1.xml · nonDerivative · entry 1

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 14,027,840

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.51 to $21.995. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 9,387,346 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 863,517 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 3,097,234 shares held of record by ILX Holdings II, LLC ("ILX II"), and 483,019 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-065292 · tm2216697-3_4seq1.xml · nonDerivative · entry 3

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 14,142,754

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.00 to $21.78. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote

F3 · ownership.nature: Following the transactions reported herein, includes 9,598,859 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 882,973 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 3,167,020 shares held of record by ILX Holdings II, LLC ("ILX II"), and 493,902 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-065292 · tm2216697-3_4seq1.xml · nonDerivative · entry 2

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 14,246,767

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.635 to $20.995. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 9,598,859 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 882,973 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 3,167,020 shares held of record by ILX Holdings II, LLC ("ILX II"), and 493,902 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-065292 · tm2216697-3_4seq1.xml · nonDerivative · entry 1

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 14,274,427

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.00 to $20.62. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 9,598,859 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 882,973 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 3,167,020 shares held of record by ILX Holdings II, LLC ("ILX II"), and 493,902 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-064273 · tm2216697-1_4seq1.xml · nonDerivative · entry 2

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 14,340,996

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.00 to $20.43. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 9,733,408 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 895,350 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 3,211,413 shares held of record by ILX Holdings II, LLC ("ILX II"), and 500,825 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-064273 · tm2216697-1_4seq1.xml · nonDerivative · entry 1

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 14,437,196

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.00 to $19.37. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 9,733,408 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 895,350 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 3,211,413 shares held of record by ILX Holdings II, LLC ("ILX II"), and 500,825 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-063399 · tm2216164-1_4seq1.xml · nonDerivative · entry 3

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 14,472,477

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.00 to $19.47. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 9,822,646 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 903,559 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 3,240,855 shares held of record by ILX Holdings II, LLC ("ILX II"), and 505,417 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-063399 · tm2216164-1_4seq1.xml · nonDerivative · entry 2

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 14,587,383

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.00 to $20.07. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 9,822,646 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 903,559 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 3,240,855 shares held of record by ILX Holdings II, LLC ("ILX II"), and 505,417 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.

SEC source: 0001104659-22-063399 · tm2216164-1_4seq1.xml · nonDerivative · entry 1

RIVERSTONE HOLDINGS LLC · CIK 0001247497 · Director · 10% owner

Riverstone/Gower Mgmt Co Holdings, L.P. · CIK 0001706129 · Director · 10% owner

Riverstone Management Group, L.L.C. · CIK 0001705948 · Director · 10% owner

LEUSCHEN DAVID M · CIK 0001222726 · Director · 10% owner

LAPEYRE PIERRE F JR · CIK 0001232151 · Director · 10% owner

ILX Holdings II, LLC · CIK 0001925147 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 14,588,468

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.00 to $19.99. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Following the transactions reported herein, includes 9,822,646 shares held of record by Riverstone Talos Energy Equityco LLC ("Riverstone Equityco"), 903,559 shares held of record by Riverstone Talos Energy Debtco LLC ("Riverstone Debtco"), 3,240,855 shares held of record by ILX Holdings II, LLC ("ILX II"), and 505,417 shares held of record by Riverstone V Castex 2014 Holdings, L.P. ("Castex 2014").

F4 · ownership.nature: David M. Leuschen and Pierre F. Lapeyre, Jr. are the managing directors of Riverstone Management Group, L.L.C., which is the general partner of Riverstone/Gower Mgmt Co Holdings, L.P. ("Riverstone/Gower"), which is the sole member of Riverstone Holdings LLC ("Riverstone Holdings"), which is the sole shareholder of Riverstone Energy GP V Corp., which is the managing member of Riverstone Energy GP V, LLC, which is the general partner of Riverstone Energy Partners V, L.P. ("Riverstone Energy Partners V"), which is the general partner of Riverstone Global Energy and Power Fund V (FT), L.P., which is the general partner of Riverstone V Talos Holdings, L.P., which is the managing member of Riverstone Equityco and the sole manager of Riverstone Debtco.

F5 · ownership.nature: In addition, Riverstone Energy Partners V owns an indirect interest in Castex 2014 and in ILX II. Each of the foregoing entity or person disclaims any such beneficial ownership of the securities reported herein 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.