AM

SEC source: 0001104659-20-083441 · a4.xml · nonDerivative · entry 1

MOLLENKOPF JOHN C · CIK 0001235082 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 37,794

SEC source: 0001104659-20-083436 · a4.xml · nonDerivative · entry 1

KEYTE DAVID H · CIK 0001215004 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,951

SEC source: 0001104659-20-083439 · a4.xml · nonDerivative · entry 1

MCARDLE JANINE J · CIK 0001250240 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,467

SEC source: 0001104659-20-083442 · a4.xml · nonDerivative · entry 1

ROBESON ROSE M · CIK 0001251678 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,935

SEC source: 0001104659-20-083435 · a4.xml · nonDerivative · entry 1

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 61,548

SEC source: 0001104659-20-057090 · a4.xml · nonDerivative · entry 1

RADY PAUL M · CIK 0001234637 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,180,821

F1 · 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: 0001104659-20-057091 · a4.xml · nonDerivative · entry 1

Warren Glen C Jr · CIK 0001375364 · Director · President and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,886,723

F1 · balance_after: Includes 45,720 shares of common stock of the Issuer subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-20-047905 · a4.xml · nonDerivative · entry 1

Ash W Patrick · CIK 0001673454 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 252,914

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, 2020.

F2 · balance_after: Includes 246,758 shares of Common Stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-20-047909 · a4.xml · nonDerivative · entry 1

Kennedy Michael N. · CIK 0001477679 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 899,145

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, 2020.

F2 · balance_after: Includes 319,972 shares of Common Stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-20-047906 · 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: 9,672,017

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, 2020.

F2 · balance_after: Includes 91,090 shares of Common Stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-20-047908 · 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: 16,886,723

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, 2020.

F2 · balance_after: Includes 45,720 shares of Common Stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-20-047907 · a4.xml · nonDerivative · entry 1

Schopp Alvyn A. · CIK 0001586799 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,944,447

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, 2020.

F2 · balance_after: Includes 480,422 shares of Common Stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-20-047910 · a4.xml · nonDerivative · entry 1

Yoo K. Phil · CIK 0001587503 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 130,465

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, 2020.

F2 · balance_after: Includes 23,674 shares of Common Stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-20-031955 · a4.xml · nonDerivative · entry 1

Yoo K. Phil · CIK 0001587503 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 134,560

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 $3.07 to $4.01, 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.

F3 · balance_after: Includes 37,797 shares of common stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-20-005600 · a4.xml · nonDerivative · entry 1

Ash W Patrick · CIK 0001673454 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 253,938

F1 · shares: Common stock subject to Restricted Stock Unit Grant Notice and Restricted Stock Unit Agreement that will vest in three equal annual installments on the first three anniversaries of the grant date.

F2 · balance_after: Includes 20,086 shares of common stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-20-005597 · a4.xml · nonDerivative · entry 1

Kennedy Michael N. · CIK 0001477679 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 905,415

F1 · shares: Common stock subject to Restricted Stock Unit Grant Notice and Restricted Stock Unit Agreement that will vest in three equal annual installments on the first three anniversaries of the grant date.

F2 · balance_after: Includes 46,945 shares of common stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-20-005598 · a4.xml · nonDerivative · entry 1

Schopp Alvyn A. · CIK 0001586799 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,950,206

F1 · shares: Common stock subject to Restricted Stock Unit Grant Notice and Restricted Stock Unit Agreement that vests on the following schedule: (i) 230,203 vest on the one-year anniversary of the grant date, (ii) 115,101 vest on the 18-month anniversary of the grant date and (iii) 115,102 vest on the two-year anniversary of the grant date.

F2 · balance_after: Includes 39,883 shares of common stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-20-005169 · a4.xml · nonDerivative · entry 1

Ash W Patrick · CIK 0001673454 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,735

F1 · balance_after: Includes 20,086 shares of common stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-20-004045 · a4.xml · nonDerivative · entry 1

DEA PETER A · CIK 0001132295 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,676

SEC source: 0001104659-20-004046 · a4.xml · nonDerivative · entry 1

MOLLENKOPF JOHN C · CIK 0001235082 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,668

SEC source: 0001104659-20-004049 · a4.xml · nonDerivative · entry 1

ROBESON ROSE M · CIK 0001251678 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,809

SEC source: 0001104659-20-004050 · a4.xml · nonDerivative · entry 1

KLIMLEY BROOKS J · CIK 0001235158 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 39,594

SEC source: 0001104659-20-004047 · a4.xml · nonDerivative · entry 1

KEYTE DAVID H · CIK 0001215004 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,825

SEC source: 0001104659-20-004048 · a4.xml · nonDerivative · entry 1

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 49,422

SEC source: 0001104659-19-072725 · tm1925268-1_4.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: 32,042,344

F1 · shares: On December 8, 2019, Antero Midstream Corporation ("Antero Midstream") agreed to purchase $100.0 million worth of shares of its common stock from Antero Resources Corporation ("Antero Resources"), with the number of shares to be sold based on a formulaic pricing mechanism taking into account both historical and future pricing of Antero Midstream's shares (the "Share Repurchase"). On December 16, 2019, Antero Resources sold 19,377,592 shares of Antero Midstream common stock to Antero Midstream pursuant to the Share Repurchase.

SEC source: 0001104659-19-073154 · a4.xml · nonDerivative · entry 1

Yoo K. Phil · CIK 0001587503 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 184,560

F1 · kind: This transaction was undertaken by the Reporting Person for tax planning purposes.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.05 to $6.055, 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.

F3 · balance_after: Includes 37,797 shares of common stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0001104659-19-070207 · a4.xml · nonDerivative · entry 1

Yoo K. Phil · CIK 0001587503 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 281,955

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 $4.29 to $4.55, 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.

F3 · balance_after: Includes 37,797 shares of common stock subject to previously granted restricted stock unit awards that remain subject to vesting.

SEC source: 0000899243-19-027201 · 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 · 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 Footnote

Disclosed balance after: 0

F1 · ownership.nature: On November 12, 2019, Warburg Pincus Private Equity X O&G, L.P., a Delaware limited partnership ("WP X O&G"), sold 22,253,508 shares of common stock, par value $0.01 per share ("Common Stock"), of Antero Midstream Corporation (the "Issuer"), and WP X O&G's affiliated partnership, 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"), sold 711,929 shares of Common Stock of the Issuer (collectively, the "Sale").

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 WP X GP. Warburg Pincus Partners, L.P., a Delaware limited partnership ("WP Partners"), is the managing member of WPP GP. 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.

F4 · ownership.nature: The WP X O&G Funds, 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"), 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 have been deemed to be beneficial owners of the Common Stock of the Issuer held collectively by the WP X O&G Funds.

F6 · ownership.nature: (Continued from Footnote 5) The Warburg Pincus Entities, Messrs. Kaye and Landy and such affiliates disclaim beneficial ownership of the Common Stock of Issuer except to the extent of their pecuniary interest therein. Prior to the Sale, each of WP X O&G, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC were a director-by-deputization solely for purposes of Section 16 of the Exchange Act.

SEC source: 0000899243-19-027201 · 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 · 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 Footnote

Disclosed balance after: 0

F1 · ownership.nature: On November 12, 2019, Warburg Pincus Private Equity X O&G, L.P., a Delaware limited partnership ("WP X O&G"), sold 22,253,508 shares of common stock, par value $0.01 per share ("Common Stock"), of Antero Midstream Corporation (the "Issuer"), and WP X O&G's affiliated partnership, 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"), sold 711,929 shares of Common Stock of the Issuer (collectively, the "Sale").

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 WP X GP. Warburg Pincus Partners, L.P., a Delaware limited partnership ("WP Partners"), is the managing member of WPP GP. 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.

F4 · ownership.nature: The WP X O&G Funds, 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"), 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 have been deemed to be beneficial owners of the Common Stock of the Issuer held collectively by the WP X O&G Funds.

F6 · ownership.nature: (Continued from Footnote 5) The Warburg Pincus Entities, Messrs. Kaye and Landy and such affiliates disclaim beneficial ownership of the Common Stock of Issuer except to the extent of their pecuniary interest therein. Prior to the Sale, each of WP X O&G, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC were a director-by-deputization solely for purposes of Section 16 of the Exchange Act.

SEC source: 0000899243-19-027201 · 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 · 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: Direct

Disclosed balance after: 0

F1 · ownership.direct: On November 12, 2019, Warburg Pincus Private Equity X O&G, L.P., a Delaware limited partnership ("WP X O&G"), sold 22,253,508 shares of common stock, par value $0.01 per share ("Common Stock"), of Antero Midstream Corporation (the "Issuer"), and WP X O&G's affiliated partnership, 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"), sold 711,929 shares of Common Stock of the Issuer (collectively, the "Sale").

F2 · 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 WP X GP. Warburg Pincus Partners, L.P., a Delaware limited partnership ("WP Partners"), is the managing member of WPP GP. Warburg Pincus Partners GP LLC, a Delaware limited liability company ("WP Partners GP"), is the general partner of WP Partners.

F3 · 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.

F4 · ownership.direct: The WP X O&G Funds, 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.direct: By reason of the provisions of Rule 16a-1 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), 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 have been deemed to be beneficial owners of the Common Stock of the Issuer held collectively by the WP X O&G Funds.

F6 · ownership.direct: (Continued from Footnote 5) The Warburg Pincus Entities, Messrs. Kaye and Landy and such affiliates disclaim beneficial ownership of the Common Stock of Issuer except to the extent of their pecuniary interest therein. Prior to the Sale, each of WP X O&G, WP X GP, WP X GP LP, WPP GP, WP Partners, WP Partners GP, WP and WP LLC were a director-by-deputization solely for purposes of Section 16 of the Exchange Act.

SEC source: 0001140361-19-020462 · form4.xml · nonDerivative · entry 1

Yorktown VIII Associates LLC · CIK 0001473117 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 3,445,636

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: 0001140361-19-020470 · form4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,445,636

SEC source: 0001140361-19-020466 · form4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,232,927

SEC source: 0001140361-19-020463 · form4.xml · nonDerivative · entry 1

Yorktown VII Associates LLC · CIK 0001423201 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 2,232,927

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: 0000899243-19-027203 · doc4.xml · nonDerivative · entry 2

KAGAN PETER · CIK 0001239315 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

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"). On November 12, 2019, the Warburg Pincus Entities (as defined below) disposed of all remaining shares of Antero Midstream Corporation ("Antero Midstream") common stock ("Common Stock") owned by such entities.

F2 · ownership.nature: All Common Stock indicated as indirectly owned by the Reporting Person is 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 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"). 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: (Continued from footnote 3) 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 X GP LP. Warburg Pincus Partners, L.P., a Delaware limited partnership ("WP Partners"), is the managing member of WPP GP. 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 the WP X O&G Funds.

F5 · ownership.nature: The WP X O&G Funds, 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: 0001140361-19-020468 · form4.xml · nonDerivative · entry 3

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 3,445,636

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 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: 0001140361-19-020468 · form4.xml · nonDerivative · entry 2

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 2,232,927

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 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: 0001104659-19-053908 · a4.xml · nonDerivative · entry 1

DEA PETER A · CIK 0001132295 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,053

SEC source: 0001104659-19-053911 · a4.xml · nonDerivative · entry 1

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 44,799

SEC source: 0001104659-19-053909 · a4.xml · nonDerivative · entry 1

KAGAN PETER · CIK 0001239315 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 49,722

SEC source: 0001104659-19-053907 · a4.xml · nonDerivative · entry 1

MOLLENKOPF JOHN C · CIK 0001235082 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,045

SEC source: 0001104659-19-053902 · a4.xml · nonDerivative · entry 1

KLIMLEY BROOKS J · CIK 0001235158 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 34,971

SEC source: 0001104659-19-053904 · a4.xml · nonDerivative · entry 1

KEYTE DAVID H · CIK 0001215004 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,202

SEC source: 0001104659-19-053910 · a4.xml · nonDerivative · entry 1

ROBESON ROSE M · CIK 0001251678 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,186

SEC source: 0001104659-19-049161 · a4.xml · nonDerivative · entry 3

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

Warburg Pincus X Partners, L.P. · CIK 0001451560 · 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

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 22,965,437

F1 · ownership.nature: Effective September 5, 2019, WP X O&G (as defined below) sold 12,580,788 shares of common stock, par value $0.01 per share ("Common Stock"), of Antero Midstream Corporation (the "Issuer") and WP X Partners sold 402,481 shares of Common Stock of the Issuer (collectively, the "Sale").

F2 · 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").

F3 · 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.

F4 · 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.

F5 · 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.

F6 · ownership.nature: By reason of the provisions of Rule 16a-1 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), 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 22,965,437 Common Stock of the Issuer held collectively by the WP X O&G Funds.

F7 · ownership.nature: (Continued from Footnote 6) The Warburg Pincus Entities, Messrs. Kaye and Landy and such affiliates disclaim beneficial ownership of the Common Stock of Issuer 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.

F8 · ownership.nature: WPP GP, WP X GP and WP X GP LP each indirectly holds, and therefore may be deemed to be the beneficial owner of the 22,965,437 Common Shares directly held by 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 22,965,437 Common Shares directly held by the WP VIII Funds and the WP X O&G Funds.

SEC source: 0001104659-19-049161 · a4.xml · nonDerivative · entry 2

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

Warburg Pincus X Partners, L.P. · CIK 0001451560 · 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

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 711,929

F1 · ownership.nature: Effective September 5, 2019, WP X O&G (as defined below) sold 12,580,788 shares of common stock, par value $0.01 per share ("Common Stock"), of Antero Midstream Corporation (the "Issuer") and WP X Partners sold 402,481 shares of Common Stock of the Issuer (collectively, the "Sale").

F2 · 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").

F3 · 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.

F4 · 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.

F5 · 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.

F6 · ownership.nature: By reason of the provisions of Rule 16a-1 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), 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 22,965,437 Common Stock of the Issuer held collectively by the WP X O&G Funds.

F7 · ownership.nature: (Continued from Footnote 6) The Warburg Pincus Entities, Messrs. Kaye and Landy and such affiliates disclaim beneficial ownership of the Common Stock of Issuer 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.

F8 · ownership.nature: WPP GP, WP X GP and WP X GP LP each indirectly holds, and therefore may be deemed to be the beneficial owner of the 22,965,437 Common Shares directly held by 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 22,965,437 Common Shares directly held by the WP VIII Funds and the WP X O&G Funds.

SEC source: 0001104659-19-049161 · a4.xml · nonDerivative · entry 1

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

Warburg Pincus X Partners, L.P. · CIK 0001451560 · 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

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,253,508

F1 · ownership.direct: Effective September 5, 2019, WP X O&G (as defined below) sold 12,580,788 shares of common stock, par value $0.01 per share ("Common Stock"), of Antero Midstream Corporation (the "Issuer") and WP X Partners sold 402,481 shares of Common Stock of the Issuer (collectively, the "Sale").

F2 · ownership.direct: 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").

F3 · 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.

F4 · 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.

F5 · 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.

F6 · ownership.direct: By reason of the provisions of Rule 16a-1 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), 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 22,965,437 Common Stock of the Issuer held collectively by the WP X O&G Funds.

F7 · ownership.direct: (Continued from Footnote 6) The Warburg Pincus Entities, Messrs. Kaye and Landy and such affiliates disclaim beneficial ownership of the Common Stock of Issuer 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.

F8 · ownership.direct: WPP GP, WP X GP and WP X GP LP each indirectly holds, and therefore may be deemed to be the beneficial owner of the 22,965,437 Common Shares directly held by the WP X O&G Funds.

F9 · ownership.direct: WP Partners, WP Partners GP, WP and WP LLC each indirectly holds, and therefore may be deemed to be the beneficial owner of the 22,965,437 Common Shares directly held by the WP VIII Funds and the WP X O&G Funds.

SEC source: 0001104659-19-049162 · a4.xml · nonDerivative · entry 2

KAGAN PETER · CIK 0001239315 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 22,965,437

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 September 5, 2019, the Warburg Pincus Entities (as defined below) collectively owned 22,965,437 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: 0000899243-19-023053 · 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: 0

SEC source: 0000899243-19-023054 · 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: 0

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

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.