AM

SEC source: 0001104659-19-021153 · a4.xml · nonDerivative · entry 1

ROBESON ROSE M · CIK 0001251678 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,984

SEC source: 0001104659-19-021152 · a4.xml · nonDerivative · entry 1

Peters David A · CIK 0001327059 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 37,788

SEC source: 0001104659-19-021154 · a4.xml · nonDerivative · entry 1

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 37,597

SEC source: 0001104659-19-014958 · a4.xml · nonDerivative · entry 7

Kennedy Michael N. · CIK 0001477679 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 584,522

F6 · price: The price reported in Column 4 is a weighted average price. These shares of New AM Common Stock were sold in multiple transactions at prices ranging from $12.41 to $13.16, inclusive.

SEC source: 0001104659-19-014958 · a4.xml · nonDerivative · entry 6

Kennedy Michael N. · CIK 0001477679 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 612,001

F5 · price: The price reported in Column 4 is a weighted average price. These shares of New AM Common Stock were sold in multiple transactions at prices ranging from $12.25 to $12.72, inclusive. The Reporting Person undertakes to provide to New AM, any security holder of New AM, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of New AM Common Stock sold at each separate price within the ranges set forth above in footnotes (5) and (6) to this Form 4.

SEC source: 0000899243-19-007792 · doc4.xml · nonDerivative · entry 8

Warburg Pincus Private Equity X O&G, L.P. · CIK 0001528258 · Director · 10% owner

Warburg Pincus X, L.P. · CIK 0001414561 · Director · 10% owner

Warburg Pincus X GP L.P. · CIK 0001414564 · Director · 10% owner

WPP GP LLC · CIK 0001621874 · Director · 10% owner

Warburg Pincus Partners, L.P. · CIK 0001621242 · Director · 10% owner

Warburg Pincus Partners GP LLC · CIK 0001621224 · Director · 10% owner

WARBURG PINCUS & CO. · CIK 0000929408 · Director · 10% owner

WARBURG PINCUS LLC · CIK 0001162870 · Director · 10% owner

KAYE CHARLES R · CIK 0001239318 · 10% owner

Landy Joseph P. · CIK 0001220638 · 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: 55,109,589

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F2 · ownership.nature: This Form 4 is filed on behalf of Warburg Pincus Private Equity X O&G, L.P., a Delaware limited partnership ("WP X O&G" and, together with its affiliated partnership, Warburg Pincus X Partners, L.P., a Delaware limited partnership ("WP X Partners"), the "WP X O&G Funds"). As of March 12, 2019, prior to the Conversion, the Warburg Pincus Entities (as defined below) collectively owned 55,109,589 AMGP Common Shares, of which (a) 34,834,296 are owned by WP X O&G and 1,114,410 are owned by WP X Partners, for an aggregate total of 35,948,706 AMGP Common Shares owned by the WP X O&G Funds, and (b) 19,160,883 are owned by the WP VIII Funds (as defined below).

F3 · ownership.nature: (Continued from Footnote 2) As of March 12, 2019, after the Conversion, the Warburg Pincus Entities collectively own 55,109,589 New AM Common Shares, of which (i) 34,834,296 are owned by WP X O&G and 1,114,410 are owned by WP X Partners, for an aggregate total of 35,948,706 New AM Common Shares owned by the WP X O&G Funds, and (ii) 19,160,883 are owned by the WP VIII Funds.

F4 · ownership.nature: The Warburg Pincus funds are the WP X O&G Funds and Warburg Pincus Private Equity VIII, L.P., a Delaware limited partnership ("WP VIII"), and its two affiliated partnerships, Warburg Pincus Netherlands Private Equity VIII C.V. I, a limited partnership formed under the laws of the Netherlands ("WP VIII CV I"), and WP-WPVIII Investors, L.P., a Delaware limited partnership ("WP-WPVIII Investors"), and together with WP VIII and WP VIII CV I, the "WP VIII Funds").

F5 · ownership.nature: Warburg Pincus X, L.P., a Delaware limited partnership ("WP X GP"), is the general partner of each of the WP X O&G Funds. Warburg Pincus X GP L.P., a Delaware limited partnership ("WP X GP LP"), is the general partner of WP X GP. WPP GP LLC, a Delaware limited liability company ("WPP GP"), is the general partner of (a) WP X GP, and (b) WP-WPVIII Investors GP L.P., a Delaware limited partnership ("WP-WPVIII GP"), which, in turn, is the general partner of WP-WPVIII Investors. Warburg Pincus Partners, L.P., a Delaware limited partnership ("WP Partners"), is (i) the managing member of WPP GP, and (ii) the general partner of WP VIII and WP VIII CV I. Warburg Pincus Partners GP LLC, a Delaware limited liability company ("WP Partners GP"), is the general partner of WP Partners.

F6 · ownership.nature: Warburg Pincus & Co., a New York general partnership ("WP"), is the managing member of WP Partners GP. Warburg Pincus LLC, a New York limited liability company ("WP LLC"), is the manager of each of the WP X O&G Funds and the WP VIII Funds.

F7 · ownership.nature: Each of the WP X O&G Funds, the WP VIII Funds, WP-WPVIII GP, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC are collectively referred to herein as the "Warburg Pincus Entities." Charles R. Kaye and Joseph P. Landy are each Managing General Partners of WP and Managing Members and Co-Chief Executive Officers of WP LLC and may be deemed to control the Warburg Pincus Entities.

F8 · ownership.nature: By reason of the provisions of Rule 16a-1 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), (a) WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP, WP LLC, and Messrs. Kaye and Landy and certain affiliates may be deemed to be beneficial owners of the 35,948,706 AMGP Common Shares (prior to the Conversion) and the 35,948,706 New AM Common Shares (after the Conversion) held collectively by the WP X O&G Funds, and (b) WPP GP, WP Partners, WP Partners GP, WP, WP LLC, and Messrs. Kaye and Landy and certain affiliates may be deemed to be beneficial owners of the 19,160,883 AMGP Common Shares (prior to the Conversion) and the 19,160,883 New AM Common Shares (after the Conversion) held collectively by the WP VIII Funds.

F9 · ownership.nature: (Continued from Footnote 8) The Warburg Pincus Entities, Messrs. Kaye and Landy and such affiliates disclaim beneficial ownership of such AMGP Common Shares and such New AM Common Shares except to the extent of their pecuniary interest therein. Each of WP X O&G, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC is a director-by-deputization solely for purposes of Section 16 of the Exchange Act.

F10 · ownership.nature: WP X GP and WP X GP LP each indirectly holds, and therefore may be deemed to be the beneficial owner of, the 35,948,706 AMGP Common Shares (prior to the Conversion) and the 35,948,706 New AM Common Shares (after the Conversion) directly held by the WP X O&G Funds.

F11 · ownership.nature: WPP GP indirectly holds, and therefore may be deemed to be the beneficial owner of, the 36,002,529 AMGP Common Shares (prior to the Conversion) and the 36,002,529 New AM Common Shares (after the conversion) directly held by WP-WPVIII Investors and the WP X O&G Funds.

F12 · ownership.nature: WP Partners, WP Partners GP, WP and WP LLC each indirectly holds, and therefore may be deemed to be the beneficial owner of, the 55,109,589 AMGP Common Shares (prior to the Conversion) and the 55,109,589 New AM Common Shares directly held by the WP VIII Funds and the WP X O&G Funds.

SEC source: 0000899243-19-007792 · doc4.xml · nonDerivative · entry 7

Warburg Pincus Private Equity X O&G, L.P. · CIK 0001528258 · Director · 10% owner

Warburg Pincus X, L.P. · CIK 0001414561 · Director · 10% owner

Warburg Pincus X GP L.P. · CIK 0001414564 · Director · 10% owner

WPP GP LLC · CIK 0001621874 · Director · 10% owner

Warburg Pincus Partners, L.P. · CIK 0001621242 · Director · 10% owner

Warburg Pincus Partners GP LLC · CIK 0001621224 · Director · 10% owner

WARBURG PINCUS & CO. · CIK 0000929408 · Director · 10% owner

WARBURG PINCUS LLC · CIK 0001162870 · Director · 10% owner

KAYE CHARLES R · CIK 0001239318 · 10% owner

Landy Joseph P. · CIK 0001220638 · 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: 36,002,529

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F2 · ownership.nature: This Form 4 is filed on behalf of Warburg Pincus Private Equity X O&G, L.P., a Delaware limited partnership ("WP X O&G" and, together with its affiliated partnership, Warburg Pincus X Partners, L.P., a Delaware limited partnership ("WP X Partners"), the "WP X O&G Funds"). As of March 12, 2019, prior to the Conversion, the Warburg Pincus Entities (as defined below) collectively owned 55,109,589 AMGP Common Shares, of which (a) 34,834,296 are owned by WP X O&G and 1,114,410 are owned by WP X Partners, for an aggregate total of 35,948,706 AMGP Common Shares owned by the WP X O&G Funds, and (b) 19,160,883 are owned by the WP VIII Funds (as defined below).

F3 · ownership.nature: (Continued from Footnote 2) As of March 12, 2019, after the Conversion, the Warburg Pincus Entities collectively own 55,109,589 New AM Common Shares, of which (i) 34,834,296 are owned by WP X O&G and 1,114,410 are owned by WP X Partners, for an aggregate total of 35,948,706 New AM Common Shares owned by the WP X O&G Funds, and (ii) 19,160,883 are owned by the WP VIII Funds.

F4 · ownership.nature: The Warburg Pincus funds are the WP X O&G Funds and Warburg Pincus Private Equity VIII, L.P., a Delaware limited partnership ("WP VIII"), and its two affiliated partnerships, Warburg Pincus Netherlands Private Equity VIII C.V. I, a limited partnership formed under the laws of the Netherlands ("WP VIII CV I"), and WP-WPVIII Investors, L.P., a Delaware limited partnership ("WP-WPVIII Investors"), and together with WP VIII and WP VIII CV I, the "WP VIII Funds").

F5 · ownership.nature: Warburg Pincus X, L.P., a Delaware limited partnership ("WP X GP"), is the general partner of each of the WP X O&G Funds. Warburg Pincus X GP L.P., a Delaware limited partnership ("WP X GP LP"), is the general partner of WP X GP. WPP GP LLC, a Delaware limited liability company ("WPP GP"), is the general partner of (a) WP X GP, and (b) WP-WPVIII Investors GP L.P., a Delaware limited partnership ("WP-WPVIII GP"), which, in turn, is the general partner of WP-WPVIII Investors. Warburg Pincus Partners, L.P., a Delaware limited partnership ("WP Partners"), is (i) the managing member of WPP GP, and (ii) the general partner of WP VIII and WP VIII CV I. Warburg Pincus Partners GP LLC, a Delaware limited liability company ("WP Partners GP"), is the general partner of WP Partners.

F6 · ownership.nature: Warburg Pincus & Co., a New York general partnership ("WP"), is the managing member of WP Partners GP. Warburg Pincus LLC, a New York limited liability company ("WP LLC"), is the manager of each of the WP X O&G Funds and the WP VIII Funds.

F7 · ownership.nature: Each of the WP X O&G Funds, the WP VIII Funds, WP-WPVIII GP, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC are collectively referred to herein as the "Warburg Pincus Entities." Charles R. Kaye and Joseph P. Landy are each Managing General Partners of WP and Managing Members and Co-Chief Executive Officers of WP LLC and may be deemed to control the Warburg Pincus Entities.

F8 · ownership.nature: By reason of the provisions of Rule 16a-1 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), (a) WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP, WP LLC, and Messrs. Kaye and Landy and certain affiliates may be deemed to be beneficial owners of the 35,948,706 AMGP Common Shares (prior to the Conversion) and the 35,948,706 New AM Common Shares (after the Conversion) held collectively by the WP X O&G Funds, and (b) WPP GP, WP Partners, WP Partners GP, WP, WP LLC, and Messrs. Kaye and Landy and certain affiliates may be deemed to be beneficial owners of the 19,160,883 AMGP Common Shares (prior to the Conversion) and the 19,160,883 New AM Common Shares (after the Conversion) held collectively by the WP VIII Funds.

F9 · ownership.nature: (Continued from Footnote 8) The Warburg Pincus Entities, Messrs. Kaye and Landy and such affiliates disclaim beneficial ownership of such AMGP Common Shares and such New AM Common Shares except to the extent of their pecuniary interest therein. Each of WP X O&G, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC is a director-by-deputization solely for purposes of Section 16 of the Exchange Act.

F10 · ownership.nature: WP X GP and WP X GP LP each indirectly holds, and therefore may be deemed to be the beneficial owner of, the 35,948,706 AMGP Common Shares (prior to the Conversion) and the 35,948,706 New AM Common Shares (after the Conversion) directly held by the WP X O&G Funds.

F11 · ownership.nature: WPP GP indirectly holds, and therefore may be deemed to be the beneficial owner of, the 36,002,529 AMGP Common Shares (prior to the Conversion) and the 36,002,529 New AM Common Shares (after the conversion) directly held by WP-WPVIII Investors and the WP X O&G Funds.

SEC source: 0000899243-19-007792 · doc4.xml · nonDerivative · entry 6

Warburg Pincus Private Equity X O&G, L.P. · CIK 0001528258 · Director · 10% owner

Warburg Pincus X, L.P. · CIK 0001414561 · Director · 10% owner

Warburg Pincus X GP L.P. · CIK 0001414564 · Director · 10% owner

WPP GP LLC · CIK 0001621874 · Director · 10% owner

Warburg Pincus Partners, L.P. · CIK 0001621242 · Director · 10% owner

Warburg Pincus Partners GP LLC · CIK 0001621224 · Director · 10% owner

WARBURG PINCUS & CO. · CIK 0000929408 · Director · 10% owner

WARBURG PINCUS LLC · CIK 0001162870 · Director · 10% owner

KAYE CHARLES R · CIK 0001239318 · 10% owner

Landy Joseph P. · CIK 0001220638 · 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: 35,948,706

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F2 · ownership.nature: This Form 4 is filed on behalf of Warburg Pincus Private Equity X O&G, L.P., a Delaware limited partnership ("WP X O&G" and, together with its affiliated partnership, Warburg Pincus X Partners, L.P., a Delaware limited partnership ("WP X Partners"), the "WP X O&G Funds"). As of March 12, 2019, prior to the Conversion, the Warburg Pincus Entities (as defined below) collectively owned 55,109,589 AMGP Common Shares, of which (a) 34,834,296 are owned by WP X O&G and 1,114,410 are owned by WP X Partners, for an aggregate total of 35,948,706 AMGP Common Shares owned by the WP X O&G Funds, and (b) 19,160,883 are owned by the WP VIII Funds (as defined below).

F3 · ownership.nature: (Continued from Footnote 2) As of March 12, 2019, after the Conversion, the Warburg Pincus Entities collectively own 55,109,589 New AM Common Shares, of which (i) 34,834,296 are owned by WP X O&G and 1,114,410 are owned by WP X Partners, for an aggregate total of 35,948,706 New AM Common Shares owned by the WP X O&G Funds, and (ii) 19,160,883 are owned by the WP VIII Funds.

F4 · ownership.nature: The Warburg Pincus funds are the WP X O&G Funds and Warburg Pincus Private Equity VIII, L.P., a Delaware limited partnership ("WP VIII"), and its two affiliated partnerships, Warburg Pincus Netherlands Private Equity VIII C.V. I, a limited partnership formed under the laws of the Netherlands ("WP VIII CV I"), and WP-WPVIII Investors, L.P., a Delaware limited partnership ("WP-WPVIII Investors"), and together with WP VIII and WP VIII CV I, the "WP VIII Funds").

F5 · ownership.nature: Warburg Pincus X, L.P., a Delaware limited partnership ("WP X GP"), is the general partner of each of the WP X O&G Funds. Warburg Pincus X GP L.P., a Delaware limited partnership ("WP X GP LP"), is the general partner of WP X GP. WPP GP LLC, a Delaware limited liability company ("WPP GP"), is the general partner of (a) WP X GP, and (b) WP-WPVIII Investors GP L.P., a Delaware limited partnership ("WP-WPVIII GP"), which, in turn, is the general partner of WP-WPVIII Investors. Warburg Pincus Partners, L.P., a Delaware limited partnership ("WP Partners"), is (i) the managing member of WPP GP, and (ii) the general partner of WP VIII and WP VIII CV I. Warburg Pincus Partners GP LLC, a Delaware limited liability company ("WP Partners GP"), is the general partner of WP Partners.

F6 · ownership.nature: Warburg Pincus & Co., a New York general partnership ("WP"), is the managing member of WP Partners GP. Warburg Pincus LLC, a New York limited liability company ("WP LLC"), is the manager of each of the WP X O&G Funds and the WP VIII Funds.

F7 · ownership.nature: Each of the WP X O&G Funds, the WP VIII Funds, WP-WPVIII GP, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC are collectively referred to herein as the "Warburg Pincus Entities." Charles R. Kaye and Joseph P. Landy are each Managing General Partners of WP and Managing Members and Co-Chief Executive Officers of WP LLC and may be deemed to control the Warburg Pincus Entities.

F8 · ownership.nature: By reason of the provisions of Rule 16a-1 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), (a) WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP, WP LLC, and Messrs. Kaye and Landy and certain affiliates may be deemed to be beneficial owners of the 35,948,706 AMGP Common Shares (prior to the Conversion) and the 35,948,706 New AM Common Shares (after the Conversion) held collectively by the WP X O&G Funds, and (b) WPP GP, WP Partners, WP Partners GP, WP, WP LLC, and Messrs. Kaye and Landy and certain affiliates may be deemed to be beneficial owners of the 19,160,883 AMGP Common Shares (prior to the Conversion) and the 19,160,883 New AM Common Shares (after the Conversion) held collectively by the WP VIII Funds.

F9 · ownership.nature: (Continued from Footnote 8) The Warburg Pincus Entities, Messrs. Kaye and Landy and such affiliates disclaim beneficial ownership of such AMGP Common Shares and such New AM Common Shares except to the extent of their pecuniary interest therein. Each of WP X O&G, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC is a director-by-deputization solely for purposes of Section 16 of the Exchange Act.

F10 · ownership.nature: WP X GP and WP X GP LP each indirectly holds, and therefore may be deemed to be the beneficial owner of, the 35,948,706 AMGP Common Shares (prior to the Conversion) and the 35,948,706 New AM Common Shares (after the Conversion) directly held by the WP X O&G Funds.

SEC source: 0000899243-19-007792 · doc4.xml · nonDerivative · entry 5

Warburg Pincus Private Equity X O&G, L.P. · CIK 0001528258 · Director · 10% owner

Warburg Pincus X, L.P. · CIK 0001414561 · Director · 10% owner

Warburg Pincus X GP L.P. · CIK 0001414564 · Director · 10% owner

WPP GP LLC · CIK 0001621874 · Director · 10% owner

Warburg Pincus Partners, L.P. · CIK 0001621242 · Director · 10% owner

Warburg Pincus Partners GP LLC · CIK 0001621224 · Director · 10% owner

WARBURG PINCUS & CO. · CIK 0000929408 · Director · 10% owner

WARBURG PINCUS LLC · CIK 0001162870 · Director · 10% owner

KAYE CHARLES R · CIK 0001239318 · 10% owner

Landy Joseph P. · CIK 0001220638 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 34,834,296

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F2 · ownership.direct: This Form 4 is filed on behalf of Warburg Pincus Private Equity X O&G, L.P., a Delaware limited partnership ("WP X O&G" and, together with its affiliated partnership, Warburg Pincus X Partners, L.P., a Delaware limited partnership ("WP X Partners"), the "WP X O&G Funds"). As of March 12, 2019, prior to the Conversion, the Warburg Pincus Entities (as defined below) collectively owned 55,109,589 AMGP Common Shares, of which (a) 34,834,296 are owned by WP X O&G and 1,114,410 are owned by WP X Partners, for an aggregate total of 35,948,706 AMGP Common Shares owned by the WP X O&G Funds, and (b) 19,160,883 are owned by the WP VIII Funds (as defined below).

F3 · ownership.direct: (Continued from Footnote 2) As of March 12, 2019, after the Conversion, the Warburg Pincus Entities collectively own 55,109,589 New AM Common Shares, of which (i) 34,834,296 are owned by WP X O&G and 1,114,410 are owned by WP X Partners, for an aggregate total of 35,948,706 New AM Common Shares owned by the WP X O&G Funds, and (ii) 19,160,883 are owned by the WP VIII Funds.

F4 · ownership.direct: The Warburg Pincus funds are the WP X O&G Funds and Warburg Pincus Private Equity VIII, L.P., a Delaware limited partnership ("WP VIII"), and its two affiliated partnerships, Warburg Pincus Netherlands Private Equity VIII C.V. I, a limited partnership formed under the laws of the Netherlands ("WP VIII CV I"), and WP-WPVIII Investors, L.P., a Delaware limited partnership ("WP-WPVIII Investors"), and together with WP VIII and WP VIII CV I, the "WP VIII Funds").

F5 · ownership.direct: Warburg Pincus X, L.P., a Delaware limited partnership ("WP X GP"), is the general partner of each of the WP X O&G Funds. Warburg Pincus X GP L.P., a Delaware limited partnership ("WP X GP LP"), is the general partner of WP X GP. WPP GP LLC, a Delaware limited liability company ("WPP GP"), is the general partner of (a) WP X GP, and (b) WP-WPVIII Investors GP L.P., a Delaware limited partnership ("WP-WPVIII GP"), which, in turn, is the general partner of WP-WPVIII Investors. Warburg Pincus Partners, L.P., a Delaware limited partnership ("WP Partners"), is (i) the managing member of WPP GP, and (ii) the general partner of WP VIII and WP VIII CV I. Warburg Pincus Partners GP LLC, a Delaware limited liability company ("WP Partners GP"), is the general partner of WP Partners.

F6 · ownership.direct: Warburg Pincus & Co., a New York general partnership ("WP"), is the managing member of WP Partners GP. Warburg Pincus LLC, a New York limited liability company ("WP LLC"), is the manager of each of the WP X O&G Funds and the WP VIII Funds.

F7 · ownership.direct: Each of the WP X O&G Funds, the WP VIII Funds, WP-WPVIII GP, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC are collectively referred to herein as the "Warburg Pincus Entities." Charles R. Kaye and Joseph P. Landy are each Managing General Partners of WP and Managing Members and Co-Chief Executive Officers of WP LLC and may be deemed to control the Warburg Pincus Entities.

SEC source: 0000899243-19-007792 · doc4.xml · nonDerivative · entry 4

Warburg Pincus Private Equity X O&G, L.P. · CIK 0001528258 · Director · 10% owner

Warburg Pincus X, L.P. · CIK 0001414561 · Director · 10% owner

Warburg Pincus X GP L.P. · CIK 0001414564 · Director · 10% owner

WPP GP LLC · CIK 0001621874 · Director · 10% owner

Warburg Pincus Partners, L.P. · CIK 0001621242 · Director · 10% owner

Warburg Pincus Partners GP LLC · CIK 0001621224 · Director · 10% owner

WARBURG PINCUS & CO. · CIK 0000929408 · Director · 10% owner

WARBURG PINCUS LLC · CIK 0001162870 · Director · 10% owner

KAYE CHARLES R · CIK 0001239318 · 10% owner

Landy Joseph P. · CIK 0001220638 · 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

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F2 · ownership.nature: This Form 4 is filed on behalf of Warburg Pincus Private Equity X O&G, L.P., a Delaware limited partnership ("WP X O&G" and, together with its affiliated partnership, Warburg Pincus X Partners, L.P., a Delaware limited partnership ("WP X Partners"), the "WP X O&G Funds"). As of March 12, 2019, prior to the Conversion, the Warburg Pincus Entities (as defined below) collectively owned 55,109,589 AMGP Common Shares, of which (a) 34,834,296 are owned by WP X O&G and 1,114,410 are owned by WP X Partners, for an aggregate total of 35,948,706 AMGP Common Shares owned by the WP X O&G Funds, and (b) 19,160,883 are owned by the WP VIII Funds (as defined below).

F3 · ownership.nature: (Continued from Footnote 2) As of March 12, 2019, after the Conversion, the Warburg Pincus Entities collectively own 55,109,589 New AM Common Shares, of which (i) 34,834,296 are owned by WP X O&G and 1,114,410 are owned by WP X Partners, for an aggregate total of 35,948,706 New AM Common Shares owned by the WP X O&G Funds, and (ii) 19,160,883 are owned by the WP VIII Funds.

F4 · ownership.nature: The Warburg Pincus funds are the WP X O&G Funds and Warburg Pincus Private Equity VIII, L.P., a Delaware limited partnership ("WP VIII"), and its two affiliated partnerships, Warburg Pincus Netherlands Private Equity VIII C.V. I, a limited partnership formed under the laws of the Netherlands ("WP VIII CV I"), and WP-WPVIII Investors, L.P., a Delaware limited partnership ("WP-WPVIII Investors"), and together with WP VIII and WP VIII CV I, the "WP VIII Funds").

F5 · ownership.nature: Warburg Pincus X, L.P., a Delaware limited partnership ("WP X GP"), is the general partner of each of the WP X O&G Funds. Warburg Pincus X GP L.P., a Delaware limited partnership ("WP X GP LP"), is the general partner of WP X GP. WPP GP LLC, a Delaware limited liability company ("WPP GP"), is the general partner of (a) WP X GP, and (b) WP-WPVIII Investors GP L.P., a Delaware limited partnership ("WP-WPVIII GP"), which, in turn, is the general partner of WP-WPVIII Investors. Warburg Pincus Partners, L.P., a Delaware limited partnership ("WP Partners"), is (i) the managing member of WPP GP, and (ii) the general partner of WP VIII and WP VIII CV I. Warburg Pincus Partners GP LLC, a Delaware limited liability company ("WP Partners GP"), is the general partner of WP Partners.

F6 · ownership.nature: Warburg Pincus & Co., a New York general partnership ("WP"), is the managing member of WP Partners GP. Warburg Pincus LLC, a New York limited liability company ("WP LLC"), is the manager of each of the WP X O&G Funds and the WP VIII Funds.

F7 · ownership.nature: Each of the WP X O&G Funds, the WP VIII Funds, WP-WPVIII GP, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC are collectively referred to herein as the "Warburg Pincus Entities." Charles R. Kaye and Joseph P. Landy are each Managing General Partners of WP and Managing Members and Co-Chief Executive Officers of WP LLC and may be deemed to control the Warburg Pincus Entities.

F8 · ownership.nature: By reason of the provisions of Rule 16a-1 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), (a) WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP, WP LLC, and Messrs. Kaye and Landy and certain affiliates may be deemed to be beneficial owners of the 35,948,706 AMGP Common Shares (prior to the Conversion) and the 35,948,706 New AM Common Shares (after the Conversion) held collectively by the WP X O&G Funds, and (b) WPP GP, WP Partners, WP Partners GP, WP, WP LLC, and Messrs. Kaye and Landy and certain affiliates may be deemed to be beneficial owners of the 19,160,883 AMGP Common Shares (prior to the Conversion) and the 19,160,883 New AM Common Shares (after the Conversion) held collectively by the WP VIII Funds.

F9 · ownership.nature: (Continued from Footnote 8) The Warburg Pincus Entities, Messrs. Kaye and Landy and such affiliates disclaim beneficial ownership of such AMGP Common Shares and such New AM Common Shares except to the extent of their pecuniary interest therein. Each of WP X O&G, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC is a director-by-deputization solely for purposes of Section 16 of the Exchange Act.

F10 · ownership.nature: WP X GP and WP X GP LP each indirectly holds, and therefore may be deemed to be the beneficial owner of, the 35,948,706 AMGP Common Shares (prior to the Conversion) and the 35,948,706 New AM Common Shares (after the Conversion) directly held by the WP X O&G Funds.

F11 · ownership.nature: WPP GP indirectly holds, and therefore may be deemed to be the beneficial owner of, the 36,002,529 AMGP Common Shares (prior to the Conversion) and the 36,002,529 New AM Common Shares (after the conversion) directly held by WP-WPVIII Investors and the WP X O&G Funds.

F12 · ownership.nature: WP Partners, WP Partners GP, WP and WP LLC each indirectly holds, and therefore may be deemed to be the beneficial owner of, the 55,109,589 AMGP Common Shares (prior to the Conversion) and the 55,109,589 New AM Common Shares directly held by the WP VIII Funds and the WP X O&G Funds.

SEC source: 0000899243-19-007792 · doc4.xml · nonDerivative · entry 3

Warburg Pincus Private Equity X O&G, L.P. · CIK 0001528258 · Director · 10% owner

Warburg Pincus X, L.P. · CIK 0001414561 · Director · 10% owner

Warburg Pincus X GP L.P. · CIK 0001414564 · Director · 10% owner

WPP GP LLC · CIK 0001621874 · Director · 10% owner

Warburg Pincus Partners, L.P. · CIK 0001621242 · Director · 10% owner

Warburg Pincus Partners GP LLC · CIK 0001621224 · Director · 10% owner

WARBURG PINCUS & CO. · CIK 0000929408 · Director · 10% owner

WARBURG PINCUS LLC · CIK 0001162870 · Director · 10% owner

KAYE CHARLES R · CIK 0001239318 · 10% owner

Landy Joseph P. · CIK 0001220638 · 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

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F2 · ownership.nature: This Form 4 is filed on behalf of Warburg Pincus Private Equity X O&G, L.P., a Delaware limited partnership ("WP X O&G" and, together with its affiliated partnership, Warburg Pincus X Partners, L.P., a Delaware limited partnership ("WP X Partners"), the "WP X O&G Funds"). As of March 12, 2019, prior to the Conversion, the Warburg Pincus Entities (as defined below) collectively owned 55,109,589 AMGP Common Shares, of which (a) 34,834,296 are owned by WP X O&G and 1,114,410 are owned by WP X Partners, for an aggregate total of 35,948,706 AMGP Common Shares owned by the WP X O&G Funds, and (b) 19,160,883 are owned by the WP VIII Funds (as defined below).

F3 · ownership.nature: (Continued from Footnote 2) As of March 12, 2019, after the Conversion, the Warburg Pincus Entities collectively own 55,109,589 New AM Common Shares, of which (i) 34,834,296 are owned by WP X O&G and 1,114,410 are owned by WP X Partners, for an aggregate total of 35,948,706 New AM Common Shares owned by the WP X O&G Funds, and (ii) 19,160,883 are owned by the WP VIII Funds.

F4 · ownership.nature: The Warburg Pincus funds are the WP X O&G Funds and Warburg Pincus Private Equity VIII, L.P., a Delaware limited partnership ("WP VIII"), and its two affiliated partnerships, Warburg Pincus Netherlands Private Equity VIII C.V. I, a limited partnership formed under the laws of the Netherlands ("WP VIII CV I"), and WP-WPVIII Investors, L.P., a Delaware limited partnership ("WP-WPVIII Investors"), and together with WP VIII and WP VIII CV I, the "WP VIII Funds").

F5 · ownership.nature: Warburg Pincus X, L.P., a Delaware limited partnership ("WP X GP"), is the general partner of each of the WP X O&G Funds. Warburg Pincus X GP L.P., a Delaware limited partnership ("WP X GP LP"), is the general partner of WP X GP. WPP GP LLC, a Delaware limited liability company ("WPP GP"), is the general partner of (a) WP X GP, and (b) WP-WPVIII Investors GP L.P., a Delaware limited partnership ("WP-WPVIII GP"), which, in turn, is the general partner of WP-WPVIII Investors. Warburg Pincus Partners, L.P., a Delaware limited partnership ("WP Partners"), is (i) the managing member of WPP GP, and (ii) the general partner of WP VIII and WP VIII CV I. Warburg Pincus Partners GP LLC, a Delaware limited liability company ("WP Partners GP"), is the general partner of WP Partners.

F6 · ownership.nature: Warburg Pincus & Co., a New York general partnership ("WP"), is the managing member of WP Partners GP. Warburg Pincus LLC, a New York limited liability company ("WP LLC"), is the manager of each of the WP X O&G Funds and the WP VIII Funds.

F7 · ownership.nature: Each of the WP X O&G Funds, the WP VIII Funds, WP-WPVIII GP, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC are collectively referred to herein as the "Warburg Pincus Entities." Charles R. Kaye and Joseph P. Landy are each Managing General Partners of WP and Managing Members and Co-Chief Executive Officers of WP LLC and may be deemed to control the Warburg Pincus Entities.

F8 · ownership.nature: By reason of the provisions of Rule 16a-1 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), (a) WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP, WP LLC, and Messrs. Kaye and Landy and certain affiliates may be deemed to be beneficial owners of the 35,948,706 AMGP Common Shares (prior to the Conversion) and the 35,948,706 New AM Common Shares (after the Conversion) held collectively by the WP X O&G Funds, and (b) WPP GP, WP Partners, WP Partners GP, WP, WP LLC, and Messrs. Kaye and Landy and certain affiliates may be deemed to be beneficial owners of the 19,160,883 AMGP Common Shares (prior to the Conversion) and the 19,160,883 New AM Common Shares (after the Conversion) held collectively by the WP VIII Funds.

F9 · ownership.nature: (Continued from Footnote 8) The Warburg Pincus Entities, Messrs. Kaye and Landy and such affiliates disclaim beneficial ownership of such AMGP Common Shares and such New AM Common Shares except to the extent of their pecuniary interest therein. Each of WP X O&G, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC is a director-by-deputization solely for purposes of Section 16 of the Exchange Act.

F10 · ownership.nature: WP X GP and WP X GP LP each indirectly holds, and therefore may be deemed to be the beneficial owner of, the 35,948,706 AMGP Common Shares (prior to the Conversion) and the 35,948,706 New AM Common Shares (after the Conversion) directly held by the WP X O&G Funds.

F11 · ownership.nature: WPP GP indirectly holds, and therefore may be deemed to be the beneficial owner of, the 36,002,529 AMGP Common Shares (prior to the Conversion) and the 36,002,529 New AM Common Shares (after the conversion) directly held by WP-WPVIII Investors and the WP X O&G Funds.

SEC source: 0000899243-19-007792 · doc4.xml · nonDerivative · entry 2

Warburg Pincus Private Equity X O&G, L.P. · CIK 0001528258 · Director · 10% owner

Warburg Pincus X, L.P. · CIK 0001414561 · Director · 10% owner

Warburg Pincus X GP L.P. · CIK 0001414564 · Director · 10% owner

WPP GP LLC · CIK 0001621874 · Director · 10% owner

Warburg Pincus Partners, L.P. · CIK 0001621242 · Director · 10% owner

Warburg Pincus Partners GP LLC · CIK 0001621224 · Director · 10% owner

WARBURG PINCUS & CO. · CIK 0000929408 · Director · 10% owner

WARBURG PINCUS LLC · CIK 0001162870 · Director · 10% owner

KAYE CHARLES R · CIK 0001239318 · 10% owner

Landy Joseph P. · CIK 0001220638 · 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

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F2 · ownership.nature: This Form 4 is filed on behalf of Warburg Pincus Private Equity X O&G, L.P., a Delaware limited partnership ("WP X O&G" and, together with its affiliated partnership, Warburg Pincus X Partners, L.P., a Delaware limited partnership ("WP X Partners"), the "WP X O&G Funds"). As of March 12, 2019, prior to the Conversion, the Warburg Pincus Entities (as defined below) collectively owned 55,109,589 AMGP Common Shares, of which (a) 34,834,296 are owned by WP X O&G and 1,114,410 are owned by WP X Partners, for an aggregate total of 35,948,706 AMGP Common Shares owned by the WP X O&G Funds, and (b) 19,160,883 are owned by the WP VIII Funds (as defined below).

F3 · ownership.nature: (Continued from Footnote 2) As of March 12, 2019, after the Conversion, the Warburg Pincus Entities collectively own 55,109,589 New AM Common Shares, of which (i) 34,834,296 are owned by WP X O&G and 1,114,410 are owned by WP X Partners, for an aggregate total of 35,948,706 New AM Common Shares owned by the WP X O&G Funds, and (ii) 19,160,883 are owned by the WP VIII Funds.

F4 · ownership.nature: The Warburg Pincus funds are the WP X O&G Funds and Warburg Pincus Private Equity VIII, L.P., a Delaware limited partnership ("WP VIII"), and its two affiliated partnerships, Warburg Pincus Netherlands Private Equity VIII C.V. I, a limited partnership formed under the laws of the Netherlands ("WP VIII CV I"), and WP-WPVIII Investors, L.P., a Delaware limited partnership ("WP-WPVIII Investors"), and together with WP VIII and WP VIII CV I, the "WP VIII Funds").

F5 · ownership.nature: Warburg Pincus X, L.P., a Delaware limited partnership ("WP X GP"), is the general partner of each of the WP X O&G Funds. Warburg Pincus X GP L.P., a Delaware limited partnership ("WP X GP LP"), is the general partner of WP X GP. WPP GP LLC, a Delaware limited liability company ("WPP GP"), is the general partner of (a) WP X GP, and (b) WP-WPVIII Investors GP L.P., a Delaware limited partnership ("WP-WPVIII GP"), which, in turn, is the general partner of WP-WPVIII Investors. Warburg Pincus Partners, L.P., a Delaware limited partnership ("WP Partners"), is (i) the managing member of WPP GP, and (ii) the general partner of WP VIII and WP VIII CV I. Warburg Pincus Partners GP LLC, a Delaware limited liability company ("WP Partners GP"), is the general partner of WP Partners.

F6 · ownership.nature: Warburg Pincus & Co., a New York general partnership ("WP"), is the managing member of WP Partners GP. Warburg Pincus LLC, a New York limited liability company ("WP LLC"), is the manager of each of the WP X O&G Funds and the WP VIII Funds.

F7 · ownership.nature: Each of the WP X O&G Funds, the WP VIII Funds, WP-WPVIII GP, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC are collectively referred to herein as the "Warburg Pincus Entities." Charles R. Kaye and Joseph P. Landy are each Managing General Partners of WP and Managing Members and Co-Chief Executive Officers of WP LLC and may be deemed to control the Warburg Pincus Entities.

F8 · ownership.nature: By reason of the provisions of Rule 16a-1 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), (a) WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP, WP LLC, and Messrs. Kaye and Landy and certain affiliates may be deemed to be beneficial owners of the 35,948,706 AMGP Common Shares (prior to the Conversion) and the 35,948,706 New AM Common Shares (after the Conversion) held collectively by the WP X O&G Funds, and (b) WPP GP, WP Partners, WP Partners GP, WP, WP LLC, and Messrs. Kaye and Landy and certain affiliates may be deemed to be beneficial owners of the 19,160,883 AMGP Common Shares (prior to the Conversion) and the 19,160,883 New AM Common Shares (after the Conversion) held collectively by the WP VIII Funds.

F9 · ownership.nature: (Continued from Footnote 8) The Warburg Pincus Entities, Messrs. Kaye and Landy and such affiliates disclaim beneficial ownership of such AMGP Common Shares and such New AM Common Shares except to the extent of their pecuniary interest therein. Each of WP X O&G, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC is a director-by-deputization solely for purposes of Section 16 of the Exchange Act.

F10 · ownership.nature: WP X GP and WP X GP LP each indirectly holds, and therefore may be deemed to be the beneficial owner of, the 35,948,706 AMGP Common Shares (prior to the Conversion) and the 35,948,706 New AM Common Shares (after the Conversion) directly held by the WP X O&G Funds.

SEC source: 0000899243-19-007792 · doc4.xml · nonDerivative · entry 1

Warburg Pincus Private Equity X O&G, L.P. · CIK 0001528258 · Director · 10% owner

Warburg Pincus X, L.P. · CIK 0001414561 · Director · 10% owner

Warburg Pincus X GP L.P. · CIK 0001414564 · Director · 10% owner

WPP GP LLC · CIK 0001621874 · Director · 10% owner

Warburg Pincus Partners, L.P. · CIK 0001621242 · Director · 10% owner

Warburg Pincus Partners GP LLC · CIK 0001621224 · Director · 10% owner

WARBURG PINCUS & CO. · CIK 0000929408 · Director · 10% owner

WARBURG PINCUS LLC · CIK 0001162870 · Director · 10% owner

KAYE CHARLES R · CIK 0001239318 · 10% owner

Landy Joseph P. · CIK 0001220638 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F2 · ownership.direct: This Form 4 is filed on behalf of Warburg Pincus Private Equity X O&G, L.P., a Delaware limited partnership ("WP X O&G" and, together with its affiliated partnership, Warburg Pincus X Partners, L.P., a Delaware limited partnership ("WP X Partners"), the "WP X O&G Funds"). As of March 12, 2019, prior to the Conversion, the Warburg Pincus Entities (as defined below) collectively owned 55,109,589 AMGP Common Shares, of which (a) 34,834,296 are owned by WP X O&G and 1,114,410 are owned by WP X Partners, for an aggregate total of 35,948,706 AMGP Common Shares owned by the WP X O&G Funds, and (b) 19,160,883 are owned by the WP VIII Funds (as defined below).

F3 · ownership.direct: (Continued from Footnote 2) As of March 12, 2019, after the Conversion, the Warburg Pincus Entities collectively own 55,109,589 New AM Common Shares, of which (i) 34,834,296 are owned by WP X O&G and 1,114,410 are owned by WP X Partners, for an aggregate total of 35,948,706 New AM Common Shares owned by the WP X O&G Funds, and (ii) 19,160,883 are owned by the WP VIII Funds.

F4 · ownership.direct: The Warburg Pincus funds are the WP X O&G Funds and Warburg Pincus Private Equity VIII, L.P., a Delaware limited partnership ("WP VIII"), and its two affiliated partnerships, Warburg Pincus Netherlands Private Equity VIII C.V. I, a limited partnership formed under the laws of the Netherlands ("WP VIII CV I"), and WP-WPVIII Investors, L.P., a Delaware limited partnership ("WP-WPVIII Investors"), and together with WP VIII and WP VIII CV I, the "WP VIII Funds").

F5 · ownership.direct: Warburg Pincus X, L.P., a Delaware limited partnership ("WP X GP"), is the general partner of each of the WP X O&G Funds. Warburg Pincus X GP L.P., a Delaware limited partnership ("WP X GP LP"), is the general partner of WP X GP. WPP GP LLC, a Delaware limited liability company ("WPP GP"), is the general partner of (a) WP X GP, and (b) WP-WPVIII Investors GP L.P., a Delaware limited partnership ("WP-WPVIII GP"), which, in turn, is the general partner of WP-WPVIII Investors. Warburg Pincus Partners, L.P., a Delaware limited partnership ("WP Partners"), is (i) the managing member of WPP GP, and (ii) the general partner of WP VIII and WP VIII CV I. Warburg Pincus Partners GP LLC, a Delaware limited liability company ("WP Partners GP"), is the general partner of WP Partners.

F6 · ownership.direct: Warburg Pincus & Co., a New York general partnership ("WP"), is the managing member of WP Partners GP. Warburg Pincus LLC, a New York limited liability company ("WP LLC"), is the manager of each of the WP X O&G Funds and the WP VIII Funds.

F7 · ownership.direct: Each of the WP X O&G Funds, the WP VIII Funds, WP-WPVIII GP, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC are collectively referred to herein as the "Warburg Pincus Entities." Charles R. Kaye and Joseph P. Landy are each Managing General Partners of WP and Managing Members and Co-Chief Executive Officers of WP LLC and may be deemed to control the Warburg Pincus Entities.

SEC source: 0001104659-19-014955 · a4.xml · nonDerivative · entry 2

DEA PETER A · CIK 0001132295 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,486

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

SEC source: 0001104659-19-014955 · a4.xml · nonDerivative · entry 1

DEA PETER A · CIK 0001132295 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

SEC source: 0001104659-19-014958 · a4.xml · nonDerivative · entry 5

Kennedy Michael N. · CIK 0001477679 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 794,522

F4 · kind: Pursuant to the Simplification Agreement, each phantom unit issued by Antero Midstream Partners LP ("Phantom Unit") was converted into the right to receive 1.8926 restricted stock units (the "RSUs"), each settleable in one share of New AM Common Stock. The RSUs will be subject to the following vesting schedule: (i) 15,593 RSUs will vest as to one half on each of April 15, 2019 and April 15, 2020; and (ii) 24,293 RSUs will vest as to one third on each of April 15, 2019, April 15, 2020 and April 15, 2021.

F4 · price: Pursuant to the Simplification Agreement, each phantom unit issued by Antero Midstream Partners LP ("Phantom Unit") was converted into the right to receive 1.8926 restricted stock units (the "RSUs"), each settleable in one share of New AM Common Stock. The RSUs will be subject to the following vesting schedule: (i) 15,593 RSUs will vest as to one half on each of April 15, 2019 and April 15, 2020; and (ii) 24,293 RSUs will vest as to one third on each of April 15, 2019, April 15, 2020 and April 15, 2021.

SEC source: 0001104659-19-014958 · a4.xml · nonDerivative · entry 4

Kennedy Michael N. · CIK 0001477679 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 754,636

F3 · kind: Pursuant to the Simplification Agreement, each outstanding Series B Unit representing limited liability company interests ("Series B Units") in Antero IDR Holdings LLC was exchanged for 176.0041 shares of New AM Common Stock (the "Series B Exchange Shares"). The Series B Exchange Shares will be subject to the same vesting conditions to which the Series B Units were subject, with two-thirds fully vested and one-third, 234,613 shares of New AM Common Stock, scheduled to vest at December 31, 2019.

F3 · price: Pursuant to the Simplification Agreement, each outstanding Series B Unit representing limited liability company interests ("Series B Units") in Antero IDR Holdings LLC was exchanged for 176.0041 shares of New AM Common Stock (the "Series B Exchange Shares"). The Series B Exchange Shares will be subject to the same vesting conditions to which the Series B Units were subject, with two-thirds fully vested and one-third, 234,613 shares of New AM Common Stock, scheduled to vest at December 31, 2019.

SEC source: 0001104659-19-014958 · a4.xml · nonDerivative · entry 3

Kennedy Michael N. · CIK 0001477679 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,620

F2 · kind: Received in exchange for 20,256 common units representing limited partnership interests ("AM Common Units") of Antero Midstream Partners LP ("AM") pursuant to the Simplification Agreement (the "Simplification Agreement"), dated as of October 9, 2018, by and among New AM, AM and certain of their affiliates. Pursuant to the Simplification Agreement, holders of AM Common Units (other than Antero Resources Corporation) received, in exchange for each AM Common Unit held, (i) $3.415 in cash without interest and 1.6350 shares of New AM Common Stock ("New AM Common Stock"), (ii) 1.8926 shares of New AM Common Stock, or (iii) $10.1364 in cash and 1.1279 shares of New AM Common Stock.

F2 · price: Received in exchange for 20,256 common units representing limited partnership interests ("AM Common Units") of Antero Midstream Partners LP ("AM") pursuant to the Simplification Agreement (the "Simplification Agreement"), dated as of October 9, 2018, by and among New AM, AM and certain of their affiliates. Pursuant to the Simplification Agreement, holders of AM Common Units (other than Antero Resources Corporation) received, in exchange for each AM Common Unit held, (i) $3.415 in cash without interest and 1.6350 shares of New AM Common Stock ("New AM Common Stock"), (ii) 1.8926 shares of New AM Common Stock, or (iii) $10.1364 in cash and 1.1279 shares of New AM Common Stock.

SEC source: 0001104659-19-014958 · a4.xml · nonDerivative · entry 2

Kennedy Michael N. · CIK 0001477679 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,774

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM ("New AM Common Stock").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM ("New AM Common Stock").

SEC source: 0001104659-19-014958 · a4.xml · nonDerivative · entry 1

Kennedy Michael N. · CIK 0001477679 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM ("New AM Common Stock").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM ("New AM Common Stock").

SEC source: 0001104659-19-014954 · a4.xml · nonDerivative · entry 2

ANTERO RESOURCES Corp · CIK 0001433270 · Director · 10% owner

Antero Subsidiary Holdings LLC · CIK 0001770089 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 107,000,001

F1 · kind: Received in exchange for 98,870,335 common units representing limited partnership interests ("AM Common Units") of Antero Midstream Partners LP ("AM") pursuant to the Simplification Agreement (the "Simplification Agreement"), dated as of October 9, 2018, by and among the Issuer, AM and certain of their affiliates. Pursuant to the Simplification Agreement, Antero Resources Corporation received, in exchange for each AM Common Unit held, (i) $3.00 in cash without interest and 1.6023 shares of New AM common stock.

F1 · price: Received in exchange for 98,870,335 common units representing limited partnership interests ("AM Common Units") of Antero Midstream Partners LP ("AM") pursuant to the Simplification Agreement (the "Simplification Agreement"), dated as of October 9, 2018, by and among the Issuer, AM and certain of their affiliates. Pursuant to the Simplification Agreement, Antero Resources Corporation received, in exchange for each AM Common Unit held, (i) $3.00 in cash without interest and 1.6023 shares of New AM common stock.

F2 · ownership.nature: Antero Subsidiary Holdings LLC is a wholly owned subsidiary of Antero Resources Corporation.

SEC source: 0001104659-19-014954 · a4.xml · nonDerivative · entry 1

ANTERO RESOURCES Corp · CIK 0001433270 · Director · 10% owner

Antero Subsidiary Holdings LLC · CIK 0001770089 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 51,419,936

F1 · kind: Received in exchange for 98,870,335 common units representing limited partnership interests ("AM Common Units") of Antero Midstream Partners LP ("AM") pursuant to the Simplification Agreement (the "Simplification Agreement"), dated as of October 9, 2018, by and among the Issuer, AM and certain of their affiliates. Pursuant to the Simplification Agreement, Antero Resources Corporation received, in exchange for each AM Common Unit held, (i) $3.00 in cash without interest and 1.6023 shares of New AM common stock.

F1 · price: Received in exchange for 98,870,335 common units representing limited partnership interests ("AM Common Units") of Antero Midstream Partners LP ("AM") pursuant to the Simplification Agreement (the "Simplification Agreement"), dated as of October 9, 2018, by and among the Issuer, AM and certain of their affiliates. Pursuant to the Simplification Agreement, Antero Resources Corporation received, in exchange for each AM Common Unit held, (i) $3.00 in cash without interest and 1.6023 shares of New AM common stock.

SEC source: 0001104659-19-014962 · a4.xml · nonDerivative · entry 2

ROBESON ROSE M · CIK 0001251678 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,619

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

SEC source: 0001104659-19-014962 · a4.xml · nonDerivative · entry 1

ROBESON ROSE M · CIK 0001251678 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

SEC source: 0000899243-19-007791 · doc4.xml · nonDerivative · entry 4

KAGAN PETER · CIK 0001239315 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 55,109,589

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F2 · ownership.nature: The Reporting Person is a Partner of Warburg Pincus & Co., a New York general partnership ("WP"), and a Member and Managing Director of Warburg Pincus LLC, a New York limited liability company ("WP LLC"). As of March 12, 2019, the Warburg Pincus Entities (as defined below) collectively owned 55,109,589 AMGP Common Shares (prior to the Conversion) and 55,109,589 New AM Common Shares (after the Conversion).

F3 · ownership.nature: All AMGP Common Shares or New AM Common Shares indicated as indirectly owned by the Reporting Person are included because of his affiliation with the Warburg Pincus Entities, due to which Mr. Kagan may be deemed to have an indirect pecuniary interest (within the meaning of Rule 16a-1 under the Securities and Exchange Act of 1934, as amended) in an indeterminate portion of the AMGP Common Shares and the New AM Common Shares owned by the Warburg Pincus Entities. Mr. Kagan disclaims beneficial ownership of all AMGP Common Shares and all New AM Common Shares attributable to the Warburg Pincus Entities except to the extent of his pecuniary interest therein.

F4 · ownership.nature: The Warburg Pincus funds are Warburg Pincus Private Equity VIII, L.P., a Delaware limited partnership ("WP VIII", and together with its two affiliated partnerships, Warburg Pincus Netherlands Private Equity VIII C.V. I, a company formed under the laws of the Netherlands ("WP VIII CV I"), and WP-WPVIII Investors, L.P., a Delaware limited partnership ("WP-WPVIII Investors"), collectively, the "WP VIII Funds"), Warburg Pincus Private Equity X O&G, L.P., a Delaware limited partnership ("WP X O&G"), and Warburg Pincus X Partners, L.P., a Delaware limited partnership ("WP X Partners", and together with WP X O&G, the "WP X O&G Funds"). WP-WPVIII Investors GP L.P., a Delaware limited partnership ("WP-WPVIII GP"), is the general partner of WP-WPVIII Investors. Warburg Pincus X, L.P., a Delaware limited partnership ("WP X GP"), is the general partner of each of the WP X O&G Funds.

F5 · ownership.nature: Warburg Pincus X GP L.P., a Delaware limited partnership ("WP X GP LP"), is the general partner of WP X GP. WPP GP LLC, a Delaware limited liability company ("WPP GP"), is the general partner of WP-WPVIII GP and WP X GP LP. Warburg Pincus Partners, L.P., a Delaware limited partnership ("WP Partners"), is (a) the managing member of WPP GP, and (b) the general partner of WP VIII and WP VIII CV I. Warburg Pincus Partners GP LLC, a Delaware limited liability company ("WP Partners GP"), is the general partner of WP Partners. WP is the managing member of WP Partners GP. WP LLC is the manager of each of the WP VIII Funds and the WP X O&G Funds.

F6 · ownership.nature: Each of the WP VIII Funds, the WP X O&G Funds, WP-WPVIII GP, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC are collectively referred to herein as the "Warburg Pincus Entities."

SEC source: 0000899243-19-007791 · doc4.xml · nonDerivative · entry 3

KAGAN PETER · CIK 0001239315 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,812

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

SEC source: 0000899243-19-007791 · doc4.xml · nonDerivative · entry 2

KAGAN PETER · CIK 0001239315 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F2 · ownership.nature: The Reporting Person is a Partner of Warburg Pincus & Co., a New York general partnership ("WP"), and a Member and Managing Director of Warburg Pincus LLC, a New York limited liability company ("WP LLC"). As of March 12, 2019, the Warburg Pincus Entities (as defined below) collectively owned 55,109,589 AMGP Common Shares (prior to the Conversion) and 55,109,589 New AM Common Shares (after the Conversion).

F3 · ownership.nature: All AMGP Common Shares or New AM Common Shares indicated as indirectly owned by the Reporting Person are included because of his affiliation with the Warburg Pincus Entities, due to which Mr. Kagan may be deemed to have an indirect pecuniary interest (within the meaning of Rule 16a-1 under the Securities and Exchange Act of 1934, as amended) in an indeterminate portion of the AMGP Common Shares and the New AM Common Shares owned by the Warburg Pincus Entities. Mr. Kagan disclaims beneficial ownership of all AMGP Common Shares and all New AM Common Shares attributable to the Warburg Pincus Entities except to the extent of his pecuniary interest therein.

F4 · ownership.nature: The Warburg Pincus funds are Warburg Pincus Private Equity VIII, L.P., a Delaware limited partnership ("WP VIII", and together with its two affiliated partnerships, Warburg Pincus Netherlands Private Equity VIII C.V. I, a company formed under the laws of the Netherlands ("WP VIII CV I"), and WP-WPVIII Investors, L.P., a Delaware limited partnership ("WP-WPVIII Investors"), collectively, the "WP VIII Funds"), Warburg Pincus Private Equity X O&G, L.P., a Delaware limited partnership ("WP X O&G"), and Warburg Pincus X Partners, L.P., a Delaware limited partnership ("WP X Partners", and together with WP X O&G, the "WP X O&G Funds"). WP-WPVIII Investors GP L.P., a Delaware limited partnership ("WP-WPVIII GP"), is the general partner of WP-WPVIII Investors. Warburg Pincus X, L.P., a Delaware limited partnership ("WP X GP"), is the general partner of each of the WP X O&G Funds.

F5 · ownership.nature: Warburg Pincus X GP L.P., a Delaware limited partnership ("WP X GP LP"), is the general partner of WP X GP. WPP GP LLC, a Delaware limited liability company ("WPP GP"), is the general partner of WP-WPVIII GP and WP X GP LP. Warburg Pincus Partners, L.P., a Delaware limited partnership ("WP Partners"), is (a) the managing member of WPP GP, and (b) the general partner of WP VIII and WP VIII CV I. Warburg Pincus Partners GP LLC, a Delaware limited liability company ("WP Partners GP"), is the general partner of WP Partners. WP is the managing member of WP Partners GP. WP LLC is the manager of each of the WP VIII Funds and the WP X O&G Funds.

F6 · ownership.nature: Each of the WP VIII Funds, the WP X O&G Funds, WP-WPVIII GP, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC are collectively referred to herein as the "Warburg Pincus Entities."

SEC source: 0000899243-19-007791 · doc4.xml · nonDerivative · entry 1

KAGAN PETER · CIK 0001239315 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP (the "AMGP Common Shares") was converted into one share of common stock of New AM ("New AM Common Shares").

SEC source: 0001104659-19-014957 · a4.xml · nonDerivative · entry 1

MOLLENKOPF JOHN C · CIK 0001235082 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,478

F1 · kind: Received in exchange for 6,065 common units representing limited partnership interests ("AM Common Units") of Antero Midstream Partners LP ("AM") pursuant to the Simplification Agreement (the "Simplification Agreement"), dated as of October 9, 2018, by and among the Issuer, AM and certain of their affiliates. Pursuant to the Simplification Agreement, holders of AM Common Units (other than Antero Resources Corporation) received, in exchange for each AM Common Unit held, (i) $3.415 in cash without interest and 1.6350 shares of New AM Common Stock ("New AM Common Stock"), (ii) 1.8926 shares of New AM Common Stock, or (iii) $10.1364 in cash and 1.1279 shares of New AM Common Stock.

F1 · price: Received in exchange for 6,065 common units representing limited partnership interests ("AM Common Units") of Antero Midstream Partners LP ("AM") pursuant to the Simplification Agreement (the "Simplification Agreement"), dated as of October 9, 2018, by and among the Issuer, AM and certain of their affiliates. Pursuant to the Simplification Agreement, holders of AM Common Units (other than Antero Resources Corporation) received, in exchange for each AM Common Unit held, (i) $3.415 in cash without interest and 1.6350 shares of New AM Common Stock ("New AM Common Stock"), (ii) 1.8926 shares of New AM Common Stock, or (iii) $10.1364 in cash and 1.1279 shares of New AM Common Stock.

SEC source: 0001104659-19-014961 · a4.xml · nonDerivative · entry 7

RADY PAUL M · CIK 0001234637 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,648,289

F5 · kind: Pursuant to the Simplification Agreement, each phantom unit issued by Antero Midstream Partners LP ("Phantom Unit") was converted into the right to receive 1.8926 restricted stock units (the "RSUs"), each settleable in one share of New AM Common Stock. The RSUs will be subject to the following vesting schedule: (i) 66,830 RSUs will vest as to one half on each of April 15, 2019 and April 15, 2020; and (ii) 98,481 RSUs will vest as to one third on each of April 15, 2019, April 15, 2020 and April 15, 2021.

F5 · price: Pursuant to the Simplification Agreement, each phantom unit issued by Antero Midstream Partners LP ("Phantom Unit") was converted into the right to receive 1.8926 restricted stock units (the "RSUs"), each settleable in one share of New AM Common Stock. The RSUs will be subject to the following vesting schedule: (i) 66,830 RSUs will vest as to one half on each of April 15, 2019 and April 15, 2020; and (ii) 98,481 RSUs will vest as to one third on each of April 15, 2019, April 15, 2020 and April 15, 2021.

SEC source: 0001104659-19-014961 · a4.xml · nonDerivative · entry 6

RADY PAUL M · CIK 0001234637 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,482,978

F4 · kind: Pursuant to the Simplification Agreement, each outstanding Series B Unit representing limited liability company interests ("Series B Units") in Antero IDR Holdings LLC was exchanged for 176.0041 shares of New AM Common Stock (the "Series B Exchange Shares"). The Series B Exchange Shares will be subject to the same vesting conditions to which the Series B Units were subject, with two-thirds fully vested and one-third, 2,816,065 shares of New AM Common Stock, scheduled to vest at December 31, 2019.

F4 · price: Pursuant to the Simplification Agreement, each outstanding Series B Unit representing limited liability company interests ("Series B Units") in Antero IDR Holdings LLC was exchanged for 176.0041 shares of New AM Common Stock (the "Series B Exchange Shares"). The Series B Exchange Shares will be subject to the same vesting conditions to which the Series B Units were subject, with two-thirds fully vested and one-third, 2,816,065 shares of New AM Common Stock, scheduled to vest at December 31, 2019.

SEC source: 0001104659-19-014961 · a4.xml · nonDerivative · entry 5

RADY PAUL M · CIK 0001234637 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,034,782

F3 · kind: Received in exchange for 194,152 common units representing limited partnership interests ("AM Common Units") of Antero Midstream Partners LP ("AM") pursuant to the Simplification Agreement (the "Simplification Agreement"), dated as of October 9, 2018, by and among the Issuer, AM and certain of their affiliates. Pursuant to the Simplification Agreement, holders of AM Common Units (other than Antero Resources Corporation) received, in exchange for each AM Common Unit held, (i) $3.415 in cash without interest and 1.6350 shares of New AM Common Stock, (ii) 1.8926 shares of New AM Common Stock, or (iii) $10.1364 in cash and 1.1279 shares of New AM Common Stock.

F3 · price: Received in exchange for 194,152 common units representing limited partnership interests ("AM Common Units") of Antero Midstream Partners LP ("AM") pursuant to the Simplification Agreement (the "Simplification Agreement"), dated as of October 9, 2018, by and among the Issuer, AM and certain of their affiliates. Pursuant to the Simplification Agreement, holders of AM Common Units (other than Antero Resources Corporation) received, in exchange for each AM Common Unit held, (i) $3.415 in cash without interest and 1.6350 shares of New AM Common Stock, (ii) 1.8926 shares of New AM Common Stock, or (iii) $10.1364 in cash and 1.1279 shares of New AM Common Stock.

SEC source: 0001104659-19-014961 · a4.xml · nonDerivative · entry 4

RADY PAUL M · CIK 0001234637 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 19,180,821

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM ("New AM Common Stock").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM ("New AM Common Stock").

F2 · ownership.nature: Represents securities held by Mockingbird Investment, LLC ("Mockingbird"). The Reporting Person owns a 3.68% limited liability company interest in Mockingbird, and a trust under his control owns the remaining 96.32%. The Reporting Person disclaims beneficial ownership of all securities held by Mockingbird except to the extent of his pecuniary interest therein.

SEC source: 0001104659-19-014961 · a4.xml · nonDerivative · entry 3

RADY PAUL M · CIK 0001234637 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 815,798

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM ("New AM Common Stock").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM ("New AM Common Stock").

SEC source: 0001104659-19-014961 · a4.xml · nonDerivative · entry 2

RADY PAUL M · CIK 0001234637 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM ("New AM Common Stock").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM ("New AM Common Stock").

F2 · ownership.nature: Represents securities held by Mockingbird Investment, LLC ("Mockingbird"). The Reporting Person owns a 3.68% limited liability company interest in Mockingbird, and a trust under his control owns the remaining 96.32%. The Reporting Person disclaims beneficial ownership of all securities held by Mockingbird except to the extent of his pecuniary interest therein.

SEC source: 0001104659-19-014961 · a4.xml · nonDerivative · entry 1

RADY PAUL M · CIK 0001234637 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM ("New AM Common Stock").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM ("New AM Common Stock").

SEC source: 0001104659-19-014959 · a4.xml · nonDerivative · entry 3

KLIMLEY BROOKS J · CIK 0001235158 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,404

F2 · kind: Received in exchange for 9,655 common units representing limited partnership interests ("AM Common Units") of Antero Midstream Partners LP ("AM") pursuant to the Simplification Agreement (the "Simplification Agreement"), dated as of October 9, 2018, by and among the Issuer, AM and certain of their affiliates. Pursuant to the Simplification Agreement, holders of AM Common Units (other than Antero Resources Corporation) received, in exchange for each AM Common Unit held, (i) $3.415 in cash without interest and 1.6350 shares of New AM Common Stock, (ii) 1.8926 shares of New AM Common Stock, or (iii) $10.1364 in cash and 1.1279 shares of New AM Common Stock.

F2 · price: Received in exchange for 9,655 common units representing limited partnership interests ("AM Common Units") of Antero Midstream Partners LP ("AM") pursuant to the Simplification Agreement (the "Simplification Agreement"), dated as of October 9, 2018, by and among the Issuer, AM and certain of their affiliates. Pursuant to the Simplification Agreement, holders of AM Common Units (other than Antero Resources Corporation) received, in exchange for each AM Common Unit held, (i) $3.415 in cash without interest and 1.6350 shares of New AM Common Stock, (ii) 1.8926 shares of New AM Common Stock, or (iii) $10.1364 in cash and 1.1279 shares of New AM Common Stock.

SEC source: 0001104659-19-014959 · a4.xml · nonDerivative · entry 2

KLIMLEY BROOKS J · CIK 0001235158 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,619

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM ("New AM Common Stock").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM ("New AM Common Stock").

SEC source: 0001104659-19-014959 · a4.xml · nonDerivative · entry 1

KLIMLEY BROOKS J · CIK 0001235158 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM ("New AM Common Stock").

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware, each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM ("New AM Common Stock").

SEC source: 0001104659-19-014960 · a4.xml · nonDerivative · entry 1

Peters David A · CIK 0001327059 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,423

F1 · kind: Received in exchange for 21,666 common units representing limited partnership interests ("AM Common Units") of Antero Midstream Partners LP ("AM") pursuant to the Simplification Agreement (the "Simplification Agreement"), dated as of October 9, 2018, by and among the Issuer, AM and certain of their affiliates. Pursuant to the Simplification Agreement, holders of AM Common Units (other than Antero Resources Corporation) received, in exchange for each AM Common Unit held, (i) $3.415 in cash without interest and 1.6350 shares of New AM Common Stock ("New AM Common Stock"), (ii) 1.8926 shares of New AM Common Stock, or (iii) $10.1364 in cash and 1.1279 shares of New AM Common Stock.

F1 · price: Received in exchange for 21,666 common units representing limited partnership interests ("AM Common Units") of Antero Midstream Partners LP ("AM") pursuant to the Simplification Agreement (the "Simplification Agreement"), dated as of October 9, 2018, by and among the Issuer, AM and certain of their affiliates. Pursuant to the Simplification Agreement, holders of AM Common Units (other than Antero Resources Corporation) received, in exchange for each AM Common Unit held, (i) $3.415 in cash without interest and 1.6350 shares of New AM Common Stock ("New AM Common Stock"), (ii) 1.8926 shares of New AM Common Stock, or (iii) $10.1364 in cash and 1.1279 shares of New AM Common Stock.

SEC source: 0000899243-19-007857 · doc4.xml · nonDerivative · entry 11

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 7,091,699

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F2 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F6 · ownership.nature: These securities are owned directly by Yorktown Energy Partners VIII, L.P. ("Yorktown VIII"). The reporting person is a member and manager of Yorktown VIII Associates LLC, the general partner of Yorktown VIII Company LP, the general partner of Yorktown VIII.

SEC source: 0000899243-19-007857 · doc4.xml · nonDerivative · entry 10

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 4,596,064

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F2 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F5 · ownership.nature: These securities are owned directly by Yorktown Energy Partners VII, L.P. ("Yorktown VII"). The reporting person is a member and manager of Yorktown VII Associates LLC, the general partner of Yorktown VII Company LP, the general partner of Yorktown VII.

SEC source: 0000899243-19-007857 · doc4.xml · nonDerivative · entry 9

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,970,846

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F2 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F4 · ownership.nature: These securities are owned directly by Yorktown Energy Partners VI, L.P. ("Yorktown VI"). The reporting person is a member and manager of Yorktown VI Associates LLC, the general partner of Yorktown VI Company LP, the general partner of Yorktown VI.

SEC source: 0000899243-19-007857 · doc4.xml · nonDerivative · entry 8

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,875,802

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F2 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F3 · ownership.nature: These securities are owned directly by Yorktown Energy Partners V, L.P. ("Yorktown V"). The reporting person is a member and manager of Yorktown V Company LLC, the general partner of Yorktown V.

SEC source: 0000899243-19-007857 · doc4.xml · nonDerivative · entry 7

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,232

F7 · kind: On March 12, 2019, simultaneously with the Conversion, Antero Midstream Merger Sub LLC, a Delaware limited liability company and wholly owned subsidiary of Antero Midstream Newco Inc., a Delaware corporation and wholly owned subsidiary of New AM, was merged with and into Antero Midstream Partners LP, a Delaware limited partnership ("Antero Midstream"), with Antero Midstream surviving such merger as an indirect wholly owned subsidiary of New AM (the "Merger"), as a result of which all outstanding common units of Antero Midstream were converted into an aggregate of approximately $598.7 million in cash and approximately 303.1 million shares of common stock, par value $0.01 per share (the "Merger Shares"). In connection, with the Merger, the reporting person made an election to convert his outstanding common units of Antero Midstream into Merger Shares and cash for consideration of $3.415 in cash and 1.6350 in Merger Shares per outstanding common unit of Antero Midstream.

F7 · price: On March 12, 2019, simultaneously with the Conversion, Antero Midstream Merger Sub LLC, a Delaware limited liability company and wholly owned subsidiary of Antero Midstream Newco Inc., a Delaware corporation and wholly owned subsidiary of New AM, was merged with and into Antero Midstream Partners LP, a Delaware limited partnership ("Antero Midstream"), with Antero Midstream surviving such merger as an indirect wholly owned subsidiary of New AM (the "Merger"), as a result of which all outstanding common units of Antero Midstream were converted into an aggregate of approximately $598.7 million in cash and approximately 303.1 million shares of common stock, par value $0.01 per share (the "Merger Shares"). In connection, with the Merger, the reporting person made an election to convert his outstanding common units of Antero Midstream into Merger Shares and cash for consideration of $3.415 in cash and 1.6350 in Merger Shares per outstanding common unit of Antero Midstream.

SEC source: 0000899243-19-007857 · doc4.xml · nonDerivative · entry 6

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,619

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

SEC source: 0000899243-19-007857 · doc4.xml · nonDerivative · entry 5

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F2 · shares: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F6 · ownership.nature: These securities are owned directly by Yorktown Energy Partners VIII, L.P. ("Yorktown VIII"). The reporting person is a member and manager of Yorktown VIII Associates LLC, the general partner of Yorktown VIII Company LP, the general partner of Yorktown VIII.

SEC source: 0000899243-19-007857 · doc4.xml · nonDerivative · entry 4

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F2 · shares: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F5 · ownership.nature: These securities are owned directly by Yorktown Energy Partners VII, L.P. ("Yorktown VII"). The reporting person is a member and manager of Yorktown VII Associates LLC, the general partner of Yorktown VII Company LP, the general partner of Yorktown VII.

SEC source: 0000899243-19-007857 · doc4.xml · nonDerivative · entry 3

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F2 · shares: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F4 · ownership.nature: These securities are owned directly by Yorktown Energy Partners VI, L.P. ("Yorktown VI"). The reporting person is a member and manager of Yorktown VI Associates LLC, the general partner of Yorktown VI Company LP, the general partner of Yorktown VI.

SEC source: 0000899243-19-007857 · doc4.xml · nonDerivative · entry 2

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F1 · kind: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F2 · shares: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F1 · price: On March 12, 2019, in connection with the conversion of Antero Midstream GP LP ("AMGP") from a limited partnership to a corporation named Antero Midstream Corporation ("New AM") under the laws of the State of Delaware (the "Conversion"), each common share representing limited partnership interests of AMGP was converted into one share of common stock of New AM.

F3 · ownership.nature: These securities are owned directly by Yorktown Energy Partners V, L.P. ("Yorktown V"). The reporting person is a member and manager of Yorktown V Company LLC, the general partner of Yorktown V.