AM

SEC source: 0000899243-19-023052 · doc4.xml · nonDerivative · entry 1

Yorktown Energy Partners VI LP · CIK 0001347504 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

SEC source: 0000899243-19-023050 · doc4.xml · nonDerivative · entry 1

Yorktown VI Associates LLC · CIK 0001347608 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

F1 · ownership.nature: These securities were owned directly by Yorktown Energy Partners VI, L.P. ("Yorktown VI"). The Reporting Person is the sole general partner of Yorktown VI Company LP. Yorktown VI Company LP is the sole general partner of Yorktown VI.

F2 · ownership.nature: The Reporting Person disclaims beneficial ownership of these securities except to the extent of its 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.

SEC source: 0000899243-19-023074 · 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 · 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 were 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: 0000899243-19-023074 · 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 · 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.

F2 · ownership.nature: These securities were 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: 0001104659-19-048705 · a4.xml · nonDerivative · entry 1

Yoo K. Phil · CIK 0001587503 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 301,955

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 7, 2019.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.88 to $7.04, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

SEC source: 0001104659-19-040183 · a4.xml · nonDerivative · entry 1

DEA PETER A · CIK 0001132295 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,539

SEC source: 0001104659-19-040184 · a4.xml · nonDerivative · entry 1

KAGAN PETER · CIK 0001239315 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,083

SEC source: 0001104659-19-040190 · a4.xml · nonDerivative · entry 1

MOLLENKOPF JOHN C · CIK 0001235082 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,531

SEC source: 0001104659-19-040189 · a4.xml · nonDerivative · entry 1

KLIMLEY BROOKS J · CIK 0001235158 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,457

SEC source: 0001104659-19-040188 · a4.xml · nonDerivative · entry 1

KEYTE DAVID H · CIK 0001215004 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,688

SEC source: 0001104659-19-040193 · a4.xml · nonDerivative · entry 1

ROBESON ROSE M · CIK 0001251678 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,672

SEC source: 0001104659-19-040191 · a4.xml · nonDerivative · entry 1

Peters David A · CIK 0001327059 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,476

SEC source: 0001104659-19-040185 · a4.xml · nonDerivative · entry 1

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,285

SEC source: 0001104659-19-031578 · a4.xml · nonDerivative · entry 1

Yoo K. Phil · CIK 0001587503 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 316,955

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $13.0725 to $13.23, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth above.

F2 · balance_after: Includes 23,673 shares of common stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-19-031562 · a4.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 · Director · 10% owner

Landy Joseph P. · CIK 0001220638 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 40,109,589

F1 · ownership.nature: The Warburg Pincus funds are 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"), 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").

F2 · 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.

F3 · 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.

F4 · 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.

F5 · 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 shares of common stock of Antero Midstream Corp (the "Common Shares") 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 4,212,177 Common Shares held collectively by the WP VIII Funds.

F6 · ownership.nature: (Continued from Footnote 5) 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.

F7 · 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 Common Shares directly held by the WP X O&G Funds.

F8 · ownership.nature: WPP GP indirectly holds, and therefore may be deemed to be the beneficial owner of the 35,960,394 Common Shares directly held by WP-WPVIII Investors and the WP X O&G Funds.

F9 · 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 40,109,589 Common Shares directly held by the WP VIII Funds and the WP X O&G Funds.

SEC source: 0001104659-19-031562 · a4.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 · Director · 10% owner

Landy Joseph P. · CIK 0001220638 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 35,960,394

F1 · ownership.nature: The Warburg Pincus funds are 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"), 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").

F2 · 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.

F3 · 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.

F4 · 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.

F5 · 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 shares of common stock of Antero Midstream Corp (the "Common Shares") 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 4,212,177 Common Shares held collectively by the WP VIII Funds.

F6 · ownership.nature: (Continued from Footnote 5) 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.

F7 · 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 Common Shares directly held by the WP X O&G Funds.

F8 · ownership.nature: WPP GP indirectly holds, and therefore may be deemed to be the beneficial owner of the 35,960,394 Common Shares directly held by WP-WPVIII Investors and the WP X O&G Funds.

SEC source: 0000899243-19-014626 · doc4.xml · nonDerivative · entry 1

Yorktown Energy Partners VIII, L.P. · CIK 0001473116 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,266,099

SEC source: 0000899243-19-014616 · doc4.xml · nonDerivative · entry 1

Yorktown VIII Associates LLC · CIK 0001473117 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 5,266,099

F1 · ownership.nature: These securities are owned directly by Yorktown Energy Partners VIII, L.P. ("Yorktown VIII"). The Reporting Person is the sole general partner of Yorktown VIII Company LP. Yorktown VIII Company LP is the sole general partner of Yorktown VIII.

F2 · ownership.nature: The Reporting Person disclaims beneficial ownership of these securities except to the extent of its 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.

SEC source: 0000899243-19-014615 · doc4.xml · nonDerivative · entry 1

Yorktown VII Associates LLC · CIK 0001423201 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 3,412,464

F1 · ownership.nature: These securities are owned directly by Yorktown Energy Partners VII, L.P. ("Yorktown VII"). The Reporting Person is the sole general partner of Yorktown VII Company LP. Yorktown VII Company LP is the sole general partner of Yorktown VII.

F2 · ownership.nature: The Reporting Person disclaims beneficial ownership of these securities except to the extent of its 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.

SEC source: 0000899243-19-014625 · doc4.xml · nonDerivative · entry 1

Yorktown Energy Partners VII, L.P. · CIK 0001423080 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,412,464

SEC source: 0001104659-19-031561 · a4.xml · nonDerivative · entry 2

KAGAN PETER · CIK 0001239315 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 40,109,589

F1 · 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 May 21, 2019, the Warburg Pincus Entities (as defined below) collectively owned 40,109,589 shares of Antero Midstream Corporation ("Antero Midstream") Common Stock ("Common Stock").

F2 · ownership.nature: All Common Stock 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 Common Stock owned by the Warburg Pincus Entities. Mr. Kagan disclaims beneficial ownership of all Common Stock attributable to the Warburg Pincus Entities except to the extent of his pecuniary interest therein.

F3 · 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 ("WPWPVIII 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.

F4 · 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.

F5 · 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: 0000899243-19-014618 · doc4.xml · nonDerivative · entry 1

YORKTOWN ENERGY PARTNERS V LP · CIK 0001210407 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,392,602

F1 · balance_after: In a prior Form 4, the number of shares of the issuer held by the reporting person was inadvertently disclosed as 1,875,502. The number of shares of the issuer actually held by the reporting person prior to the transaction reported herein was 1,875,802.

SEC source: 0000899243-19-014619 · doc4.xml · nonDerivative · entry 1

Yorktown VI Associates LLC · CIK 0001347608 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,463,246

F1 · ownership.nature: These securities are owned directly by Yorktown Energy Partners VI, L.P. ("Yorktown VI"). The Reporting Person is the sole general partner of Yorktown VI Company LP. Yorktown VI Company LP is the sole general partner of Yorktown VI.

F2 · ownership.nature: The Reporting Person disclaims beneficial ownership of these securities except to the extent of its 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.

SEC source: 0000899243-19-014627 · doc4.xml · nonDerivative · entry 1

Yorktown V CO LLC · CIK 0001302152 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,392,602

F1 · balance_after: In a prior Form 4, the number of shares of the issuer held by Yorktown Energy Partners V, L.P. ("Yorktown V") was inadvertently disclosed as 1,875,502. The number of shares of the issuer actually held by Yorktown V prior to the transaction reported herein was 1,875,802.

F2 · ownership.nature: These securities are owned directly by Yorktown V. The Reporting Person is the sole general partner of Yorktown V.

F3 · ownership.nature: The Reporting Person disclaims beneficial ownership of these securities except to the extent of its 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.

SEC source: 0000899243-19-014621 · doc4.xml · nonDerivative · entry 1

Yorktown Energy Partners VI LP · CIK 0001347504 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,463,246

SEC source: 0000899243-19-014629 · doc4.xml · nonDerivative · entry 5

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 5,266,099

F1 · 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 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: 0000899243-19-014629 · doc4.xml · nonDerivative · entry 4

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 3,412,464

F1 · 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 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: 0000899243-19-014629 · doc4.xml · nonDerivative · entry 3

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,463,246

F1 · 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 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: 0000899243-19-014629 · doc4.xml · nonDerivative · entry 2

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,392,602

F1 · 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.

F2 · 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: 0001104659-19-021978 · a4.xml · derivative · entry 3

Kennedy Michael N. · CIK 0001477679 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,952

Underlying: Common Stock · 22,952 shares

Expires not disclosed

F4 · derivative.exercise_price: Each performance share unit ("PSU") represents a contingent right to receive one share of common stock of the Issuer.

F5 · derivative.exercise_date: The PSUs vest on April 15, 2022 based upon the Issuer's achievement of absolute total shareholder return goals. Depending on the level of achievement of such goals, the actual number of PSUs earned could range from 0% to 200% of the target number of PSUs, as shown in columns 5 and 6.

F5 · derivative.expiration_date: The PSUs vest on April 15, 2022 based upon the Issuer's achievement of absolute total shareholder return goals. Depending on the level of achievement of such goals, the actual number of PSUs earned could range from 0% to 200% of the target number of PSUs, as shown in columns 5 and 6.

SEC source: 0001104659-19-021978 · a4.xml · nonDerivative · entry 2

Kennedy Michael N. · CIK 0001477679 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 610,755

F3 · shares: Common Stock subject to a Restricted Stock Unit Grant Notice and Restricted Stock Unit Agreement that vest in four equal installments on the first four anniversaries of the grant date.

F2 · balance_after: Includes 23,993 shares of Common Stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-19-021978 · a4.xml · nonDerivative · entry 1

Kennedy Michael N. · CIK 0001477679 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 587,803

F1 · shares: In connection with the vesting and settlement of restricted stock units through the issuance of common stock of the Issuer ("Common Stock") pursuant to the Antero Midstream Corporation Long Term Incentive Plan, the Issuer withheld Common Stock that would otherwise have been issued to the Reporting Person to satisfy its tax withholding obligations. The number of shares of Common Stock withheld was determined based on the closing price per share of Common Stock on April 15, 2019.

F2 · balance_after: Includes 23,993 shares of Common Stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-19-021982 · a4.xml · derivative · entry 4

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 77,684

Underlying: Common Stock · 77,684 shares

Expires not disclosed

F5 · derivative.exercise_price: Each performance share unit ("PSU") represents a contingent right to receive one share of common stock of the Issuer.

F6 · derivative.exercise_date: The PSUs vest on April 15, 2022 based upon the Issuer's achievement of absolute total shareholder return goals. Depending on the level of achievement of such goals, the actual number of PSUs earned could range from 0% to 200% of the target number of PSUs, as shown in columns 5 and 6.

F6 · derivative.expiration_date: The PSUs vest on April 15, 2022 based upon the Issuer's achievement of absolute total shareholder return goals. Depending on the level of achievement of such goals, the actual number of PSUs earned could range from 0% to 200% of the target number of PSUs, as shown in columns 5 and 6.

SEC source: 0001104659-19-021982 · a4.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,696,844

F3 · shares: Common Stock subject to a Restricted Stock Unit Grant Notice and Restricted Stock Unit Agreement that vest in four equal installments on the first four anniversaries of the grant date.

F2 · balance_after: Includes 99,069 shares of Common Stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-19-021982 · 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: 9,619,160

F1 · shares: In connection with the vesting and settlement of restricted stock units through the issuance of common stock of the Issuer ("Common Stock") pursuant to the Antero Midstream Corporation Long Term Incentive Plan, the Issuer withheld Common Stock that would otherwise have been issued to the Reporting Person to satisfy its tax withholding obligations. The number of shares of Common Stock withheld was determined based on the closing price per share of Common Stock on April 15, 2019.

F2 · balance_after: Includes 99,069 shares of Common Stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-19-021976 · a4.xml · derivative · entry 4

Warren Glen C Jr · CIK 0001375364 · Director · President and Secretary · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,780

Underlying: Common Stock · 31,780 shares

Expires not disclosed

F5 · derivative.exercise_price: Each performance share unit ("PSU") represents a contingent right to receive one share of common stock of the Issuer.

F6 · derivative.exercise_date: The PSUs vest on April 15, 2022 based upon the Issuer's achievement of absolute total shareholder return goals. Depending on the level of achievement of such goals, the actual number of PSUs earned could range from 0% to 200% of the target number of PSUs, as shown in columns 5 and 6.

F6 · derivative.expiration_date: The PSUs vest on April 15, 2022 based upon the Issuer's achievement of absolute total shareholder return goals. Depending on the level of achievement of such goals, the actual number of PSUs earned could range from 0% to 200% of the target number of PSUs, as shown in columns 5 and 6.

SEC source: 0001104659-19-021976 · a4.xml · nonDerivative · entry 2

Warren Glen C Jr · CIK 0001375364 · Director · President and Secretary · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,901,825

F3 · shares: Common Stock subject to a Restricted Stock Unit Grant Notice and Restricted Stock Unit Agreement that vest in four equal installments on the first four anniversaries of the grant date.

F2 · balance_after: Includes 66,047 shares of Common Stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-19-021976 · a4.xml · nonDerivative · entry 1

Warren Glen C Jr · CIK 0001375364 · Director · President and Secretary · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,870,045

F1 · shares: In connection with the vesting and settlement of restricted stock units through the issuance of common stock of the Issuer ("Common Stock") pursuant to the Antero Midstream Corporation Long Term Incentive Plan, the Issuer withheld Common Stock that would otherwise have been issued to the Reporting Person to satisfy its tax withholding obligations. The number of shares of Common Stock withheld was determined based on the closing price per share of Common Stock on April 15, 2019.

F2 · balance_after: Includes 66,047 shares of Common Stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-19-021977 · a4.xml · nonDerivative · entry 2

Yoo K. Phil · CIK 0001587503 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 336,955

F3 · shares: Common Stock subject to a Restricted Stock Unit Grant Notice and Restricted Stock Unit Agreement that vest in four equal installments on the first four anniversaries of the grant date.

F2 · balance_after: Includes 23,673 shares of Common Stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-19-021977 · a4.xml · nonDerivative · entry 1

Yoo K. Phil · CIK 0001587503 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 322,831

F1 · shares: In connection with the vesting and settlement of restricted stock units through the issuance of common stock of the Issuer ("Common Stock") pursuant to the Antero Midstream Corporation Long Term Incentive Plan, the Issuer withheld Common Stock that would otherwise have been issued to the Reporting Person to satisfy its tax withholding obligations. The number of shares of Common Stock withheld was determined based on the closing price per share of Common Stock on April 15, 2019.

F2 · balance_after: Includes 23,673 shares of Common Stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-19-021974 · a4.xml · derivative · entry 3

Schopp Alvyn A. · CIK 0001586799 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,890

Underlying: Common Stock · 15,890 shares

Expires not disclosed

F4 · derivative.exercise_price: Each performance share unit ("PSU") represents a contingent right to receive one share of common stock of the Issuer.

F5 · derivative.exercise_date: The PSUs vest on April 15, 2022 based upon the Issuer's achievement of absolute total shareholder return goals. Depending on the level of achievement of such goals, the actual number of PSUs earned could range from 0% to 200% of the target number of PSUs, as shown in columns 5 and 6.

F5 · derivative.expiration_date: The PSUs vest on April 15, 2022 based upon the Issuer's achievement of absolute total shareholder return goals. Depending on the level of achievement of such goals, the actual number of PSUs earned could range from 0% to 200% of the target number of PSUs, as shown in columns 5 and 6.

SEC source: 0001104659-19-021974 · a4.xml · nonDerivative · entry 2

Schopp Alvyn A. · CIK 0001586799 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,489,800

F3 · shares: Common Stock subject to a Restricted Stock Unit Grant Notice and Restricted Stock Unit Agreement that vest in four equal installments on the first four anniversaries of the grant date.

F2 · balance_after: Includes 23,993 shares of Common Stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-19-021974 · a4.xml · nonDerivative · entry 1

Schopp Alvyn A. · CIK 0001586799 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,473,910

F1 · shares: In connection with the vesting and settlement of restricted stock units through the issuance of common stock of the Issuer ("Common Stock") pursuant to the Antero Midstream Corporation Long Term Incentive Plan, the Issuer withheld Common Stock that would otherwise have been issued to the Reporting Person to satisfy its tax withholding obligations. The number of shares of Common Stock withheld was determined based on the closing price per share of Common Stock on April 15, 2019.

F2 · balance_after: Includes 23,993 shares of Common Stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-19-021980 · a4.xml · derivative · entry 3

Kilstrom Kevin J. · CIK 0001586805 · Sr Vice President - Production

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,890

Underlying: Common Stock · 15,890 shares

Expires not disclosed

F4 · derivative.exercise_price: Each performance share unit ("PSU") represents a contingent right to receive one share of common stock of the Issuer.

F5 · derivative.exercise_date: The PSUs vest on April 15, 2022 based upon the Issuer's achievement of absolute total shareholder return goals. Depending on the level of achievement of such goals, the actual number of PSUs earned could range from 0% to 200% of the target number of PSUs, as shown in columns 5 and 6.

F5 · derivative.expiration_date: The PSUs vest on April 15, 2022 based upon the Issuer's achievement of absolute total shareholder return goals. Depending on the level of achievement of such goals, the actual number of PSUs earned could range from 0% to 200% of the target number of PSUs, as shown in columns 5 and 6.

SEC source: 0001104659-19-021980 · a4.xml · nonDerivative · entry 2

Kilstrom Kevin J. · CIK 0001586805 · Sr Vice President - Production

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,020,052

F3 · shares: Common Stock subject to a Restricted Stock Unit Grant Notice and Restricted Stock Unit Agreement that vest in four equal installments on the first four anniversaries of the grant date.

F2 · balance_after: Includes 23,993 shares of Common Stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-19-021980 · a4.xml · nonDerivative · entry 1

Kilstrom Kevin J. · CIK 0001586805 · Sr Vice President - Production

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,004,162

F1 · shares: In connection with the vesting and settlement of restricted stock units through the issuance of common stock of the Issuer ("Common Stock") pursuant to the Antero Midstream Corporation Long Term Incentive Plan, the Issuer withheld Common Stock that would otherwise have been issued to the Reporting Person to satisfy its tax withholding obligations. The number of shares of Common Stock withheld was determined based on the closing price per share of Common Stock on April 15, 2019.

F2 · balance_after: Includes 23,993 shares of Common Stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-19-021156 · a4.xml · nonDerivative · entry 1

DEA PETER A · CIK 0001132295 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,851

SEC source: 0001104659-19-021157 · a4.xml · nonDerivative · entry 1

KAGAN PETER · CIK 0001239315 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,451

SEC source: 0001104659-19-021151 · a4.xml · nonDerivative · entry 1

MOLLENKOPF JOHN C · CIK 0001235082 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,843

SEC source: 0001104659-19-021155 · a4.xml · nonDerivative · entry 1

KLIMLEY BROOKS J · CIK 0001235158 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,769