MGY

SEC source: 0001104659-21-121368 · tm2128889-2_4seq1.xml · derivative · entry 3

EnerVest, Ltd. · CIK 0001375345 · Director · 10% owner

EnerVest Management GP, L.C. · CIK 0001749934 · 10% owner

EnerVest Energy Institutional Fund XIV-A, L.P. · CIK 0001634806 · 10% owner

EnerVest Energy Institutional Fund XIV-2A, L.P. · CIK 0001674589 · 10% owner

EnerVest Energy Institutional Fund XIV-3A, L.P. · CIK 0001677997 · 10% owner

EnerVest Energy Institutional Fund XIV-WIC, L.P. · CIK 0001749857 · 10% owner

EnerVest Energy Institutional Fund XIV-C-AIV, L.P. · CIK 0001749935 · 10% owner

EnerVest Energy Institutional Fund XIV-C, L.P. · CIK 0001634809 · 10% owner

EnerVest Investment Services, L.L.C. · CIK 0001749921 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 55,915,438

Underlying: Class A Common Stock · 4,608,218 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F4 · derivative.exercise_price: Represents: (i) 3,049,908 shares of Class B Common Stock held by EV XIV-A converted to the same number of shares of Class A Common Stock; (ii) 31,862 shares of Class B Common Stock held by EV XIV-WIC converted to the same number of shares of Class A Common Stock; (iii) 583,656 shares of Class B Common Stock held by EV XIV-2A converted to the same number of shares of Class A Common Stock; (iv) 602,100 shares of Class B Common Stock held by EV XIV-3A converted to the same number of shares of Class A Common Stock; and (v) 340,692 shares of Class B Common Stock held by EV XIV-C-AIV converted to the same number of shares of Class A Common Stock (collectively, the "September 2021 Conversion Shares").

F4 · shares: Represents: (i) 3,049,908 shares of Class B Common Stock held by EV XIV-A converted to the same number of shares of Class A Common Stock; (ii) 31,862 shares of Class B Common Stock held by EV XIV-WIC converted to the same number of shares of Class A Common Stock; (iii) 583,656 shares of Class B Common Stock held by EV XIV-2A converted to the same number of shares of Class A Common Stock; (iv) 602,100 shares of Class B Common Stock held by EV XIV-3A converted to the same number of shares of Class A Common Stock; and (v) 340,692 shares of Class B Common Stock held by EV XIV-C-AIV converted to the same number of shares of Class A Common Stock (collectively, the "September 2021 Conversion Shares").

F1 · price: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F1 · derivative.exercise_date: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F9 · derivative.expiration_date: Not applicable.

F4 · derivative.underlying_shares: Represents: (i) 3,049,908 shares of Class B Common Stock held by EV XIV-A converted to the same number of shares of Class A Common Stock; (ii) 31,862 shares of Class B Common Stock held by EV XIV-WIC converted to the same number of shares of Class A Common Stock; (iii) 583,656 shares of Class B Common Stock held by EV XIV-2A converted to the same number of shares of Class A Common Stock; (iv) 602,100 shares of Class B Common Stock held by EV XIV-3A converted to the same number of shares of Class A Common Stock; and (v) 340,692 shares of Class B Common Stock held by EV XIV-C-AIV converted to the same number of shares of Class A Common Stock (collectively, the "September 2021 Conversion Shares").

F2 · balance_after: EnerVest Management GP, L.C. ("EVM GP") is the general partner of EnerVest, Ltd. ("EnerVest"), which is the sole member, with sole control over the actions of, each of, EVFA GP XIV, LLC, EVFA XIV-2A, LLC and EVFA XIV-3A, LLC, the managing general partners, respectively, of EnerVest Energy Institutional Fund XIV-A, L.P. ("EV XIV-A"), EnerVest Energy Institutional Fund XIV-2A, L.P. ("EV XIV-2A") and EnerVest Energy Institutional Fund XIV-3A, L.P. ("EV XIV-3A"). EnerVest is also the sole member, with sole control over the actions of, each of, EnerVest Holding XIV, LLC, the general partner of EnerVest Energy Institutional Fund XIV-WIC, L.P. ("EV XIV-WIC"), EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C-AIV, L.P. ("EV XIV-C-AIV"), and EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C, L.P. ("EV XIV-C").

F3 · balance_after: EnerVest Investment Services, L.L.C. ("EIS, LLC") is the investment advisor for EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, EV XIV-C-AIV and EV XIV-C (such six entities together, the "Record Holders" and each, a "Record Holder").

F6 · balance_after: Represents shares of Class B Common Stock held (prior to giving effect to the September 2021 Transfer (defined below)) as follows: (i) 37,007,140 shares of Class B Common Stock held by EV XIV-A; (ii) 386,595 shares of Class B Common Stock held by EV XIV-WIC; (iii) 7,081,994 shares of Class B Common Stock held by EV XIV-2A; (iv) 7,305,800 shares of Class B Common Stock held by EV XIV-3A; and (v) 4,133,909 shares of Class B Common Stock held by EV XIV-C-AIV.

F10 · balance_after: Each Record Holder and each of EVM GP, EnerVest, EVFA GP XIV, LLC, EVFA XIV-2A, LLC, EVFA XIV-3A, LLC, EnerVest Holding XIV, LLC, EVFC GP XIV, LLC, and EIS, LLC (collectively, the "Non-Fund Entities") directly (whether through ownership or position) or indirectly through one or more intermediaries, may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, to be the indirect beneficial owner of some or all of the Equity Interests (as defined below) owned by the Record Holders and, therefore, a "ten percent holder" hereunder.

F11 · balance_after: Each Record Holder and each Non-Fund Entity disclaims beneficial ownership of the Equity Interests reported herein, except to the extent of its pecuniary interest therein, and, with respect to each of the Record Holders, except to the extent of its respective direct ownership reported herein, and this report shall not be deemed an admission that the Reporting Persons are the beneficial owners of such securities for purposes of Section 16 or for any other purposes.

F12 · balance_after: Represents the aggregate number of shares of Class B Common Stock owned by EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, and EV XIV-C-AIV. (EV XIV-C's shares of Class A Common Stock, together with the shares of Class B Common Stock and Units held by EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, and EV XIV-C-AIV, are collectively referred to herein as the "Equity Interests.")

SEC source: 0001104659-21-121368 · tm2128889-2_4seq1.xml · nonDerivative · entry 2

EnerVest, Ltd. · CIK 0001375345 · Director · 10% owner

EnerVest Management GP, L.C. · CIK 0001749934 · 10% owner

EnerVest Energy Institutional Fund XIV-A, L.P. · CIK 0001634806 · 10% owner

EnerVest Energy Institutional Fund XIV-2A, L.P. · CIK 0001674589 · 10% owner

EnerVest Energy Institutional Fund XIV-3A, L.P. · CIK 0001677997 · 10% owner

EnerVest Energy Institutional Fund XIV-WIC, L.P. · CIK 0001749857 · 10% owner

EnerVest Energy Institutional Fund XIV-C-AIV, L.P. · CIK 0001749935 · 10% owner

EnerVest Energy Institutional Fund XIV-C, L.P. · CIK 0001634809 · 10% owner

EnerVest Investment Services, L.L.C. · CIK 0001749921 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,112,444

F15 · shares: Represents shares of Class A Common Stock sold in an underwritten block trade transaction pursuant to the Issuer's registration statement on Form S-3 filed with the SEC on August 10, 2018 (the "Block Trade"), as follows: (i) 3,049,908 shares of Class A Common Stock sold by EV XIV-A; (ii) 31,862 shares of Class A Common Stock sold by EV XIV-WIC; (iii) 583,656 shares of Class A Common Stock sold by EV XIV-2A; (iv) 602,100 shares of Class A Common Stock sold by EV XIV-3A; (v) 340,692 shares of Class A Common Stock sold by EV XIV-C-AIV; and (vi) 2,891,782 shares of Class A Common Stock sold by EV XIV-C.

F7 · price: This amount represents the purchase price in the Block Trade (as defined below). The Record Holders, other than EV XIV-C, also used this price per share for the purchase price of the shares of Class B Common Stock under the September 2021 Transfer.

F2 · balance_after: EnerVest Management GP, L.C. ("EVM GP") is the general partner of EnerVest, Ltd. ("EnerVest"), which is the sole member, with sole control over the actions of, each of, EVFA GP XIV, LLC, EVFA XIV-2A, LLC and EVFA XIV-3A, LLC, the managing general partners, respectively, of EnerVest Energy Institutional Fund XIV-A, L.P. ("EV XIV-A"), EnerVest Energy Institutional Fund XIV-2A, L.P. ("EV XIV-2A") and EnerVest Energy Institutional Fund XIV-3A, L.P. ("EV XIV-3A"). EnerVest is also the sole member, with sole control over the actions of, each of, EnerVest Holding XIV, LLC, the general partner of EnerVest Energy Institutional Fund XIV-WIC, L.P. ("EV XIV-WIC"), EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C-AIV, L.P. ("EV XIV-C-AIV"), and EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C, L.P. ("EV XIV-C").

F3 · balance_after: EnerVest Investment Services, L.L.C. ("EIS, LLC") is the investment advisor for EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, EV XIV-C-AIV and EV XIV-C (such six entities together, the "Record Holders" and each, a "Record Holder").

F10 · balance_after: Each Record Holder and each of EVM GP, EnerVest, EVFA GP XIV, LLC, EVFA XIV-2A, LLC, EVFA XIV-3A, LLC, EnerVest Holding XIV, LLC, EVFC GP XIV, LLC, and EIS, LLC (collectively, the "Non-Fund Entities") directly (whether through ownership or position) or indirectly through one or more intermediaries, may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, to be the indirect beneficial owner of some or all of the Equity Interests (as defined below) owned by the Record Holders and, therefore, a "ten percent holder" hereunder.

F11 · balance_after: Each Record Holder and each Non-Fund Entity disclaims beneficial ownership of the Equity Interests reported herein, except to the extent of its pecuniary interest therein, and, with respect to each of the Record Holders, except to the extent of its respective direct ownership reported herein, and this report shall not be deemed an admission that the Reporting Persons are the beneficial owners of such securities for purposes of Section 16 or for any other purposes.

F14 · balance_after: EV XIV-C owns of record 20,112,444 shares of Class A Common Stock.

SEC source: 0001104659-21-121368 · tm2128889-2_4seq1.xml · nonDerivative · entry 1

EnerVest, Ltd. · CIK 0001375345 · Director · 10% owner

EnerVest Management GP, L.C. · CIK 0001749934 · 10% owner

EnerVest Energy Institutional Fund XIV-A, L.P. · CIK 0001634806 · 10% owner

EnerVest Energy Institutional Fund XIV-2A, L.P. · CIK 0001674589 · 10% owner

EnerVest Energy Institutional Fund XIV-3A, L.P. · CIK 0001677997 · 10% owner

EnerVest Energy Institutional Fund XIV-WIC, L.P. · CIK 0001749857 · 10% owner

EnerVest Energy Institutional Fund XIV-C-AIV, L.P. · CIK 0001749935 · 10% owner

EnerVest Energy Institutional Fund XIV-C, L.P. · CIK 0001634809 · 10% owner

EnerVest Investment Services, L.L.C. · CIK 0001749921 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,612,444

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

F4 · shares: Represents: (i) 3,049,908 shares of Class B Common Stock held by EV XIV-A converted to the same number of shares of Class A Common Stock; (ii) 31,862 shares of Class B Common Stock held by EV XIV-WIC converted to the same number of shares of Class A Common Stock; (iii) 583,656 shares of Class B Common Stock held by EV XIV-2A converted to the same number of shares of Class A Common Stock; (iv) 602,100 shares of Class B Common Stock held by EV XIV-3A converted to the same number of shares of Class A Common Stock; and (v) 340,692 shares of Class B Common Stock held by EV XIV-C-AIV converted to the same number of shares of Class A Common Stock (collectively, the "September 2021 Conversion Shares").

F1 · price: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F2 · balance_after: EnerVest Management GP, L.C. ("EVM GP") is the general partner of EnerVest, Ltd. ("EnerVest"), which is the sole member, with sole control over the actions of, each of, EVFA GP XIV, LLC, EVFA XIV-2A, LLC and EVFA XIV-3A, LLC, the managing general partners, respectively, of EnerVest Energy Institutional Fund XIV-A, L.P. ("EV XIV-A"), EnerVest Energy Institutional Fund XIV-2A, L.P. ("EV XIV-2A") and EnerVest Energy Institutional Fund XIV-3A, L.P. ("EV XIV-3A"). EnerVest is also the sole member, with sole control over the actions of, each of, EnerVest Holding XIV, LLC, the general partner of EnerVest Energy Institutional Fund XIV-WIC, L.P. ("EV XIV-WIC"), EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C-AIV, L.P. ("EV XIV-C-AIV"), and EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C, L.P. ("EV XIV-C").

F3 · balance_after: EnerVest Investment Services, L.L.C. ("EIS, LLC") is the investment advisor for EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, EV XIV-C-AIV and EV XIV-C (such six entities together, the "Record Holders" and each, a "Record Holder").

F5 · balance_after: Represents the September 2021 Conversion Shares and 23,004,226 shares of Class A Common Stock held by EV XIV-C.

F10 · balance_after: Each Record Holder and each of EVM GP, EnerVest, EVFA GP XIV, LLC, EVFA XIV-2A, LLC, EVFA XIV-3A, LLC, EnerVest Holding XIV, LLC, EVFC GP XIV, LLC, and EIS, LLC (collectively, the "Non-Fund Entities") directly (whether through ownership or position) or indirectly through one or more intermediaries, may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, to be the indirect beneficial owner of some or all of the Equity Interests (as defined below) owned by the Record Holders and, therefore, a "ten percent holder" hereunder.

F11 · balance_after: Each Record Holder and each Non-Fund Entity disclaims beneficial ownership of the Equity Interests reported herein, except to the extent of its pecuniary interest therein, and, with respect to each of the Record Holders, except to the extent of its respective direct ownership reported herein, and this report shall not be deemed an admission that the Reporting Persons are the beneficial owners of such securities for purposes of Section 16 or for any other purposes.

SEC source: 0001104659-21-121369 · tm2128889-3_4seq1.xml · derivative · entry 5

Walker John B · CIK 0001374442 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 52,915,438

Underlying: Class A Common Stock · 3,000,000 shares

Expires not disclosed

F1 · derivative.exercise_price: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F9 · shares: Represents: (i) 1,985,524 shares of Class B Common Stock transferred by EV XIV-A; (ii) 20,742 shares of Class B Common Stock transferred by EV XIV-WIC; (iii) 379,966 shares of Class B Common Stock transferred by EV XIV-2A; (iv) 391,974 shares of Class B Common Stock transferred by EV XIV-3A; and (v) 221,794 shares of Class B Common Stock transferred by EV XIV-C-AIV (collectively, the "September 2021 Transfer").

F8 · price: This amount represents the purchase price in the 144 Sale (as defined below). The Record Holders, other than EV XIV-C, also used this price per share for the purchase price of the shares of Class B Common Stock under the June 2021 Transfer.

F1 · derivative.exercise_date: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F10 · derivative.expiration_date: Not applicable.

F9 · derivative.underlying_shares: Represents: (i) 1,985,524 shares of Class B Common Stock transferred by EV XIV-A; (ii) 20,742 shares of Class B Common Stock transferred by EV XIV-WIC; (iii) 379,966 shares of Class B Common Stock transferred by EV XIV-2A; (iv) 391,974 shares of Class B Common Stock transferred by EV XIV-3A; and (v) 221,794 shares of Class B Common Stock transferred by EV XIV-C-AIV (collectively, the "September 2021 Transfer").

F12 · balance_after: Represents the aggregate number of shares of Class B Common Stock owned by EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, and EV XIV-C-AIV. (EV XIV-C's shares of Class A Common Stock, together with the shares of Class B Common Stock and Units held by EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, and EV XIV-C-AIV, are collectively referred to herein as the "Equity Interests.")

F13 · balance_after: EV XIV-A owns of record 35,021,616 shares of Class B Common Stock; EV XIV-2A owns of record 6,702,028 shares of Class B Common Stock; EV XIV-3A owns of record 6,913,826 shares of Class B Common Stock; EV XIV-WIC owns of record 365,853 shares of Class B Common Stock; and EV XIV-C-AIV owns of record 3,912,115 shares of Class B Common Stock.

F2 · ownership.nature: EnerVest Management GP, L.C. ("EVM GP") is the general partner of EnerVest, Ltd. ("EnerVest"), which is the sole member, with sole control over the actions of, each of, EVFA GP XIV, LLC, EVFA XIV-2A, LLC and EVFA XIV-3A, LLC, the managing general partners, respectively, of EnerVest Energy Institutional Fund XIV-A, L.P. ("EV XIV-A"), EnerVest Energy Institutional Fund XIV-2A, L.P. ("EV XIV-2A") and EnerVest Energy Institutional Fund XIV-3A, L.P. ("EV XIV-3A").

F3 · ownership.nature: EnerVest is also the sole member, with sole control over the actions of, each of, EnerVest Holding XIV, LLC, the general partner of EnerVest Energy Institutional Fund XIV-WIC, L.P. ("EV XIV-WIC"), EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C-AIV, L.P. ("EV XIV-C-AIV"), and EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C, L.P. ("EV XIV-C"). (EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, EV XIV-C-AIV and EV XIV-C together, the "Record Holders"). Mr. Walker is an indirect owner and the Executive Chairman of EVM GP.

F11 · ownership.nature: Mr. Walker directly (whether through ownership or position) or indirectly through one or more intermediaries, may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, to be the indirect beneficial owner of the Equity Interests (as defined below) owned by the Record Holders. Mr. Walker disclaims beneficial ownership of the Equity Interests held by each of the Record Holders except to the extent of his pecuniary interest in each of the Record Holders and this report shall not be deemed an admission that he is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001104659-21-121369 · tm2128889-3_4seq1.xml · derivative · entry 4

Walker John B · CIK 0001374442 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 55,915,438

Underlying: Class A Common Stock · 4,608,218 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F4 · shares: Represents: (i) 3,049,908 shares of Class B Common Stock held by EV XIV-A converted to the same number of shares of Class A Common Stock; (ii) 31,862 shares of Class B Common Stock held by EV XIV-WIC converted to the same number of shares of Class A Common Stock; (iii) 583,656 shares of Class B Common Stock held by EV XIV-2A converted to the same number of shares of Class A Common Stock; (iv) 602,100 shares of Class B Common Stock held by EV XIV-3A converted to the same number of shares of Class A Common Stock; and (v) 340,692 shares of Class B Common Stock held by EV XIV-C-AIV converted to the same number of shares of Class A Common Stock (collectively, the "September 2021 Conversion Shares").

F1 · price: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F1 · derivative.exercise_date: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F10 · derivative.expiration_date: Not applicable.

F4 · derivative.underlying_shares: Represents: (i) 3,049,908 shares of Class B Common Stock held by EV XIV-A converted to the same number of shares of Class A Common Stock; (ii) 31,862 shares of Class B Common Stock held by EV XIV-WIC converted to the same number of shares of Class A Common Stock; (iii) 583,656 shares of Class B Common Stock held by EV XIV-2A converted to the same number of shares of Class A Common Stock; (iv) 602,100 shares of Class B Common Stock held by EV XIV-3A converted to the same number of shares of Class A Common Stock; and (v) 340,692 shares of Class B Common Stock held by EV XIV-C-AIV converted to the same number of shares of Class A Common Stock (collectively, the "September 2021 Conversion Shares").

F7 · balance_after: Represents shares of Class B Common Stock held (prior to giving effect to the September 2021 Transfer (defined below)) as follows: (i) 37,007,140 shares of Class B Common Stock held by EV XIV-A; (ii) 386,595 shares of Class B Common Stock held by EV XIV-WIC; (iii) 7,081,994 shares of Class B Common Stock held by EV XIV-2A; (iv) 7,305,800 shares of Class B Common Stock held by EV XIV-3A; and (v) 4,133,909 shares of Class B Common Stock held by EV XIV-C-AIV.

F12 · balance_after: Represents the aggregate number of shares of Class B Common Stock owned by EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, and EV XIV-C-AIV. (EV XIV-C's shares of Class A Common Stock, together with the shares of Class B Common Stock and Units held by EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, and EV XIV-C-AIV, are collectively referred to herein as the "Equity Interests.")

F2 · ownership.nature: EnerVest Management GP, L.C. ("EVM GP") is the general partner of EnerVest, Ltd. ("EnerVest"), which is the sole member, with sole control over the actions of, each of, EVFA GP XIV, LLC, EVFA XIV-2A, LLC and EVFA XIV-3A, LLC, the managing general partners, respectively, of EnerVest Energy Institutional Fund XIV-A, L.P. ("EV XIV-A"), EnerVest Energy Institutional Fund XIV-2A, L.P. ("EV XIV-2A") and EnerVest Energy Institutional Fund XIV-3A, L.P. ("EV XIV-3A").

F3 · ownership.nature: EnerVest is also the sole member, with sole control over the actions of, each of, EnerVest Holding XIV, LLC, the general partner of EnerVest Energy Institutional Fund XIV-WIC, L.P. ("EV XIV-WIC"), EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C-AIV, L.P. ("EV XIV-C-AIV"), and EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C, L.P. ("EV XIV-C"). (EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, EV XIV-C-AIV and EV XIV-C together, the "Record Holders"). Mr. Walker is an indirect owner and the Executive Chairman of EVM GP.

F11 · ownership.nature: Mr. Walker directly (whether through ownership or position) or indirectly through one or more intermediaries, may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, to be the indirect beneficial owner of the Equity Interests (as defined below) owned by the Record Holders. Mr. Walker disclaims beneficial ownership of the Equity Interests held by each of the Record Holders except to the extent of his pecuniary interest in each of the Record Holders and this report shall not be deemed an admission that he is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001104659-21-121369 · tm2128889-3_4seq1.xml · nonDerivative · entry 2

Walker John B · CIK 0001374442 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 20,112,444

F15 · shares: Represents shares of Class A Common Stock sold in an underwritten block trade transaction pursuant to the Issuer's registration statement on Form S-3 filed with the SEC on August 10, 2018 (the "Block Trade"), as follows: (i) 3,049,908 shares of Class A Common Stock sold by EV XIV-A; (ii) 31,862 shares of Class A Common Stock sold by EV XIV-WIC; (iii) 583,656 shares of Class A Common Stock sold by EV XIV-2A; (iv) 602,100 shares of Class A Common Stock sold by EV XIV-3A; (v) 340,692 shares of Class A Common Stock sold by EV XIV-C-AIV; and (vi) 2,891,782 shares of Class A Common Stock sold by EV XIV-C.

F8 · price: This amount represents the purchase price in the 144 Sale (as defined below). The Record Holders, other than EV XIV-C, also used this price per share for the purchase price of the shares of Class B Common Stock under the June 2021 Transfer.

F14 · balance_after: EV XIV-C owns of record 20,112,444 shares of Class A Common Stock.

F2 · ownership.nature: EnerVest Management GP, L.C. ("EVM GP") is the general partner of EnerVest, Ltd. ("EnerVest"), which is the sole member, with sole control over the actions of, each of, EVFA GP XIV, LLC, EVFA XIV-2A, LLC and EVFA XIV-3A, LLC, the managing general partners, respectively, of EnerVest Energy Institutional Fund XIV-A, L.P. ("EV XIV-A"), EnerVest Energy Institutional Fund XIV-2A, L.P. ("EV XIV-2A") and EnerVest Energy Institutional Fund XIV-3A, L.P. ("EV XIV-3A").

F3 · ownership.nature: EnerVest is also the sole member, with sole control over the actions of, each of, EnerVest Holding XIV, LLC, the general partner of EnerVest Energy Institutional Fund XIV-WIC, L.P. ("EV XIV-WIC"), EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C-AIV, L.P. ("EV XIV-C-AIV"), and EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C, L.P. ("EV XIV-C"). (EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, EV XIV-C-AIV and EV XIV-C together, the "Record Holders"). Mr. Walker is an indirect owner and the Executive Chairman of EVM GP.

F11 · ownership.nature: Mr. Walker directly (whether through ownership or position) or indirectly through one or more intermediaries, may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, to be the indirect beneficial owner of the Equity Interests (as defined below) owned by the Record Holders. Mr. Walker disclaims beneficial ownership of the Equity Interests held by each of the Record Holders except to the extent of his pecuniary interest in each of the Record Holders and this report shall not be deemed an admission that he is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001104659-21-121369 · tm2128889-3_4seq1.xml · nonDerivative · entry 1

Walker John B · CIK 0001374442 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 27,612,444

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

F4 · shares: Represents: (i) 3,049,908 shares of Class B Common Stock held by EV XIV-A converted to the same number of shares of Class A Common Stock; (ii) 31,862 shares of Class B Common Stock held by EV XIV-WIC converted to the same number of shares of Class A Common Stock; (iii) 583,656 shares of Class B Common Stock held by EV XIV-2A converted to the same number of shares of Class A Common Stock; (iv) 602,100 shares of Class B Common Stock held by EV XIV-3A converted to the same number of shares of Class A Common Stock; and (v) 340,692 shares of Class B Common Stock held by EV XIV-C-AIV converted to the same number of shares of Class A Common Stock (collectively, the "September 2021 Conversion Shares").

F1 · price: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F5 · balance_after: Represents the September 2021 Conversion Shares and 23,004,226 shares of Class A Common Stock held by EV XIV-C.

F2 · ownership.nature: EnerVest Management GP, L.C. ("EVM GP") is the general partner of EnerVest, Ltd. ("EnerVest"), which is the sole member, with sole control over the actions of, each of, EVFA GP XIV, LLC, EVFA XIV-2A, LLC and EVFA XIV-3A, LLC, the managing general partners, respectively, of EnerVest Energy Institutional Fund XIV-A, L.P. ("EV XIV-A"), EnerVest Energy Institutional Fund XIV-2A, L.P. ("EV XIV-2A") and EnerVest Energy Institutional Fund XIV-3A, L.P. ("EV XIV-3A").

F3 · ownership.nature: EnerVest is also the sole member, with sole control over the actions of, each of, EnerVest Holding XIV, LLC, the general partner of EnerVest Energy Institutional Fund XIV-WIC, L.P. ("EV XIV-WIC"), EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C-AIV, L.P. ("EV XIV-C-AIV"), and EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C, L.P. ("EV XIV-C"). (EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, EV XIV-C-AIV and EV XIV-C together, the "Record Holders"). Mr. Walker is an indirect owner and the Executive Chairman of EVM GP.

F11 · ownership.nature: Mr. Walker directly (whether through ownership or position) or indirectly through one or more intermediaries, may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, to be the indirect beneficial owner of the Equity Interests (as defined below) owned by the Record Holders. Mr. Walker disclaims beneficial ownership of the Equity Interests held by each of the Record Holders except to the extent of his pecuniary interest in each of the Record Holders and this report shall not be deemed an admission that he is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001415889-21-004509 · form4-09212021_010950.xml · nonDerivative · entry 1

Yang Timothy D. · CIK 0001627951 · EVP - GENERAL COUNSEL & SEC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 473,037

SEC source: 0001415889-21-004236 · form4-09032021_010900.xml · nonDerivative · entry 1

Yang Timothy D. · CIK 0001627951 · EVP - GENERAL COUNSEL & SEC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 492,712

SEC source: 0001415889-21-004238 · form4-09032021_010909.xml · nonDerivative · entry 1

Acosta Arcilia · CIK 0001629039 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 119,327

F1 · shares: Reflects additional fully-vested restricted stock units ("RSUs") issued under the Magnolia Oil & Gas Corporation Long Term Incentive Plan with respect to dividend equivalent rights on previously deferred RSUs held by the reporting person, in connection with the payment of cash dividends to holders of Class A common stock ("Class A Common Stock") of Magnolia Oil & Gas Corporation on September 1, 2021. Each RSU represents a contingent right to receive one share of Class A Common Stock.

SEC source: 0001415889-21-004239 · form4-09032021_010923.xml · nonDerivative · entry 1

Busch Angela M · CIK 0001740094 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 84,081

F1 · shares: Reflects additional fully-vested restricted stock units ("RSUs") issued under the Magnolia Oil & Gas Corporation Long Term Incentive Plan with respect to dividend equivalent rights on previously deferred RSUs held by the reporting person, in connection with the payment of cash dividends to holders of Class A common stock ("Class A Common Stock") of Magnolia Oil & Gas Corporation on September 1, 2021. Each RSU represents a contingent right to receive one share of Class A Common Stock.

SEC source: 0001415889-21-003803 · form4-08052021_020859.xml · nonDerivative · entry 1

CHAZEN STEPHEN I · CIK 0001026545 · Director · CHAIRMAN, CEO, PRESIDENT

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,045,971

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $13.705154 to $14.445681, inclusive. The reporting person undertakes to provide to Magnolia Oil & Gas Corporation, any security holder thereof, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within this range.

F2 · balance_after: The number of securities beneficially owned following the reported transaction includes 6,726 shares acquired under the Magnolia Oil & Gas Corporation Stock Purchase Program during the period from December 4, 2020 through July 30, 2021.

SEC source: 0001415889-21-003789 · form4-08042021_010857.xml · nonDerivative · entry 1

Chase Valerie · CIK 0001748399 · VP, CAO & CONTROLLER

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 92,888

SEC source: 0001415889-21-003787 · form4-08042021_010845.xml · nonDerivative · entry 1

Yang Timothy D. · CIK 0001627951 · EVP - GENERAL COUNSEL & SEC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 494,900

SEC source: 0001415889-21-003785 · form4-08042021_010826.xml · nonDerivative · entry 1

Stavros Christopher G · CIK 0001613357 · EXECUTIVE VP, CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 555,836

SEC source: 0001415889-21-003478 · form4-07062021_010722.xml · nonDerivative · entry 1

Yang Timothy D. · CIK 0001627951 · EVP - GENERAL COUNSEL & SEC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 497,088

SEC source: 0001104659-21-083587 · tm2120217-2_4seq1.xml · derivative · entry 4

EnerVest, Ltd. · CIK 0001375345 · Director · 10% owner

EnerVest Management GP, L.C. · CIK 0001749934 · 10% owner

EnerVest Energy Institutional Fund XIV-A, L.P. · CIK 0001634806 · 10% owner

EnerVest Energy Institutional Fund XIV-2A, L.P. · CIK 0001674589 · 10% owner

EnerVest Energy Institutional Fund XIV-3A, L.P. · CIK 0001677997 · 10% owner

EnerVest Energy Institutional Fund XIV-WIC, L.P. · CIK 0001749857 · 10% owner

EnerVest Energy Institutional Fund XIV-C-AIV, L.P. · CIK 0001749935 · 10% owner

EnerVest Energy Institutional Fund XIV-C, L.P. · CIK 0001634809 · 10% owner

EnerVest Investment Services, L.L.C. · CIK 0001749921 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 60,523,656

Underlying: Class A Common Stock · 5,000,000 shares

Expires not disclosed

F1 · derivative.exercise_price: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F8 · derivative.exercise_price: Represents: (i) 3,309,206 shares of Class B Common Stock transferred by EV XIV-A; (ii) 34,570 shares of Class B Common Stock transferred by EV XIV-WIC; (iii) 633,277 shares of Class B Common Stock transferred by EV XIV-2A; (iv) 653,290 shares of Class B Common Stock transferred by EV XIV-3A; and (v) 369,657 shares of Class B Common Stock transferred by EV XIV-C-AIV (collectively, the "June 2021 Transfer").

F8 · shares: Represents: (i) 3,309,206 shares of Class B Common Stock transferred by EV XIV-A; (ii) 34,570 shares of Class B Common Stock transferred by EV XIV-WIC; (iii) 633,277 shares of Class B Common Stock transferred by EV XIV-2A; (iv) 653,290 shares of Class B Common Stock transferred by EV XIV-3A; and (v) 369,657 shares of Class B Common Stock transferred by EV XIV-C-AIV (collectively, the "June 2021 Transfer").

F7 · price: This amount represents the purchase price in the 144 Sale (as defined below). The Record Holders, other than EV XIV-C, also used this price per share for the purchase price of the shares of Class B Common Stock under the June 2021 Transfer.

F1 · derivative.exercise_date: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F9 · derivative.expiration_date: Not applicable.

F8 · derivative.underlying_shares: Represents: (i) 3,309,206 shares of Class B Common Stock transferred by EV XIV-A; (ii) 34,570 shares of Class B Common Stock transferred by EV XIV-WIC; (iii) 633,277 shares of Class B Common Stock transferred by EV XIV-2A; (iv) 653,290 shares of Class B Common Stock transferred by EV XIV-3A; and (v) 369,657 shares of Class B Common Stock transferred by EV XIV-C-AIV (collectively, the "June 2021 Transfer").

F2 · balance_after: EnerVest Management GP, L.C. ("EVM GP") is the general partner of EnerVest, Ltd. ("EnerVest"), which is the sole member, with sole control over the actions of, each of, EVFA GP XIV, LLC, EVFA XIV-2A, LLC and EVFA XIV-3A, LLC, the managing general partners, respectively, of EnerVest Energy Institutional Fund XIV-A, L.P. ("EV XIV-A"), EnerVest Energy Institutional Fund XIV-2A, L.P. ("EV XIV-2A") and EnerVest Energy Institutional Fund XIV-3A, L.P. ("EV XIV-3A"). EnerVest is also the sole member, with sole control over the actions of, each of, EnerVest Holding XIV, LLC, the general partner of EnerVest Energy Institutional Fund XIV-WIC, L.P. ("EV XIV-WIC"), EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C-AIV, L.P. ("EV XIV-C-AIV"), and EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C, L.P. ("EV XIV-C").

F3 · balance_after: EnerVest Investment Services, L.L.C. ("EIS, LLC") is the investment advisor for EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, EV XIV-C-AIV and EV XIV-C (such six entities together, the "Record Holders" and each, a "Record Holder").

F10 · balance_after: Each Record Holder and each of EVM GP, EnerVest, EVFA GP XIV, LLC, EVFA XIV-2A, LLC, EVFA XIV-3A, LLC, EnerVest Holding XIV, LLC, EVFC GP XIV, LLC, and EIS, LLC (collectively, the "Non-Fund Entities") directly (whether through ownership or position) or indirectly through one or more intermediaries, may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, to be the indirect beneficial owner of some or all of the Equity Interests (as defined below) owned by the Record Holders and, therefore, a "ten percent holder" hereunder.

F11 · balance_after: Each Record Holder and each Non-Fund Entity disclaims beneficial ownership of the Equity Interests reported herein, except to the extent of its pecuniary interest therein, and, with respect to each of the Record Holders, except to the extent of its respective direct ownership reported herein, and this report shall not be deemed an admission that the Reporting Persons are the beneficial owners of such securities for purposes of Section 16 or for any other purposes.

F12 · balance_after: Represents the aggregate number of shares of Class B Common Stock owned by EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, and EV XIV-C-AIV. (EV XIV-C's shares of Class A Common Stock, together with the shares of Class B Common Stock and Units held by EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, and EV XIV-C-AIV, are collectively referred to herein as the "Equity Interests.")

F13 · balance_after: EV XIV-A owns of record 40,057,048 shares of Class B Common Stock; EV XIV-2A owns of record 7,665,650 shares of Class B Common Stock; EV XIV-3A owns of record 7,907,900 shares of Class B Common Stock; EV XIV-WIC owns of record 418,457 shares of Class B Common Stock; and EV XIV-C-AIV owns of record 4,474,601 shares of Class B Common Stock.

SEC source: 0001104659-21-083587 · tm2120217-2_4seq1.xml · derivative · entry 3

EnerVest, Ltd. · CIK 0001375345 · Director · 10% owner

EnerVest Management GP, L.C. · CIK 0001749934 · 10% owner

EnerVest Energy Institutional Fund XIV-A, L.P. · CIK 0001634806 · 10% owner

EnerVest Energy Institutional Fund XIV-2A, L.P. · CIK 0001674589 · 10% owner

EnerVest Energy Institutional Fund XIV-3A, L.P. · CIK 0001677997 · 10% owner

EnerVest Energy Institutional Fund XIV-WIC, L.P. · CIK 0001749857 · 10% owner

EnerVest Energy Institutional Fund XIV-C-AIV, L.P. · CIK 0001749935 · 10% owner

EnerVest Energy Institutional Fund XIV-C, L.P. · CIK 0001634809 · 10% owner

EnerVest Investment Services, L.L.C. · CIK 0001749921 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 65,523,656

Underlying: Class A Common Stock · 1,100,379 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F4 · derivative.exercise_price: Represents: (i) 728,276 shares of Class B Common Stock held by EV XIV-A converted to the same number of shares of Class A Common Stock; (ii) 7,608 shares of Class B Common Stock held by EV XIV-WIC converted to the same number of shares of Class A Common Stock; (iii) 139,369 shares of Class B Common Stock held by EV XIV-2A converted to the same number of shares of Class A Common Stock; (iv) 143,773 shares of Class B Common Stock held by EV XIV-3A converted to the same number of shares of Class A Common Stock; and (v) 81,353 shares of Class B Common Stock held by EV XIV-C-AIV converted to the same number of shares of Class A Common Stock (collectively, the "June 2021 Conversion Shares").

F4 · shares: Represents: (i) 728,276 shares of Class B Common Stock held by EV XIV-A converted to the same number of shares of Class A Common Stock; (ii) 7,608 shares of Class B Common Stock held by EV XIV-WIC converted to the same number of shares of Class A Common Stock; (iii) 139,369 shares of Class B Common Stock held by EV XIV-2A converted to the same number of shares of Class A Common Stock; (iv) 143,773 shares of Class B Common Stock held by EV XIV-3A converted to the same number of shares of Class A Common Stock; and (v) 81,353 shares of Class B Common Stock held by EV XIV-C-AIV converted to the same number of shares of Class A Common Stock (collectively, the "June 2021 Conversion Shares").

F1 · price: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F1 · derivative.exercise_date: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F9 · derivative.expiration_date: Not applicable.

F4 · derivative.underlying_shares: Represents: (i) 728,276 shares of Class B Common Stock held by EV XIV-A converted to the same number of shares of Class A Common Stock; (ii) 7,608 shares of Class B Common Stock held by EV XIV-WIC converted to the same number of shares of Class A Common Stock; (iii) 139,369 shares of Class B Common Stock held by EV XIV-2A converted to the same number of shares of Class A Common Stock; (iv) 143,773 shares of Class B Common Stock held by EV XIV-3A converted to the same number of shares of Class A Common Stock; and (v) 81,353 shares of Class B Common Stock held by EV XIV-C-AIV converted to the same number of shares of Class A Common Stock (collectively, the "June 2021 Conversion Shares").

F2 · balance_after: EnerVest Management GP, L.C. ("EVM GP") is the general partner of EnerVest, Ltd. ("EnerVest"), which is the sole member, with sole control over the actions of, each of, EVFA GP XIV, LLC, EVFA XIV-2A, LLC and EVFA XIV-3A, LLC, the managing general partners, respectively, of EnerVest Energy Institutional Fund XIV-A, L.P. ("EV XIV-A"), EnerVest Energy Institutional Fund XIV-2A, L.P. ("EV XIV-2A") and EnerVest Energy Institutional Fund XIV-3A, L.P. ("EV XIV-3A"). EnerVest is also the sole member, with sole control over the actions of, each of, EnerVest Holding XIV, LLC, the general partner of EnerVest Energy Institutional Fund XIV-WIC, L.P. ("EV XIV-WIC"), EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C-AIV, L.P. ("EV XIV-C-AIV"), and EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C, L.P. ("EV XIV-C").

F3 · balance_after: EnerVest Investment Services, L.L.C. ("EIS, LLC") is the investment advisor for EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, EV XIV-C-AIV and EV XIV-C (such six entities together, the "Record Holders" and each, a "Record Holder").

F6 · balance_after: Represents shares of Class B Common Stock held (prior to giving effect to the June 2021 Transfer (defined below)) as follows: (i) 43,366,254 shares of Class B Common Stock held by EV XIV-A; (ii) 453,027 shares of Class B Common Stock held by EV XIV-WIC; (iii) 8,298,927 shares of Class B Common Stock held by EV XIV-2A; (iv) 8,561,190 shares of Class B Common Stock held by EV XIV-3A; and (v) 4,844,258 shares of Class B Common Stock held by EV XIV-C-AIV.

F10 · balance_after: Each Record Holder and each of EVM GP, EnerVest, EVFA GP XIV, LLC, EVFA XIV-2A, LLC, EVFA XIV-3A, LLC, EnerVest Holding XIV, LLC, EVFC GP XIV, LLC, and EIS, LLC (collectively, the "Non-Fund Entities") directly (whether through ownership or position) or indirectly through one or more intermediaries, may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, to be the indirect beneficial owner of some or all of the Equity Interests (as defined below) owned by the Record Holders and, therefore, a "ten percent holder" hereunder.

F11 · balance_after: Each Record Holder and each Non-Fund Entity disclaims beneficial ownership of the Equity Interests reported herein, except to the extent of its pecuniary interest therein, and, with respect to each of the Record Holders, except to the extent of its respective direct ownership reported herein, and this report shall not be deemed an admission that the Reporting Persons are the beneficial owners of such securities for purposes of Section 16 or for any other purposes.

F12 · balance_after: Represents the aggregate number of shares of Class B Common Stock owned by EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, and EV XIV-C-AIV. (EV XIV-C's shares of Class A Common Stock, together with the shares of Class B Common Stock and Units held by EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, and EV XIV-C-AIV, are collectively referred to herein as the "Equity Interests.")

SEC source: 0001104659-21-083587 · tm2120217-2_4seq1.xml · nonDerivative · entry 2

EnerVest, Ltd. · CIK 0001375345 · Director · 10% owner

EnerVest Management GP, L.C. · CIK 0001749934 · 10% owner

EnerVest Energy Institutional Fund XIV-A, L.P. · CIK 0001634806 · 10% owner

EnerVest Energy Institutional Fund XIV-2A, L.P. · CIK 0001674589 · 10% owner

EnerVest Energy Institutional Fund XIV-3A, L.P. · CIK 0001677997 · 10% owner

EnerVest Energy Institutional Fund XIV-WIC, L.P. · CIK 0001749857 · 10% owner

EnerVest Energy Institutional Fund XIV-C-AIV, L.P. · CIK 0001749935 · 10% owner

EnerVest Energy Institutional Fund XIV-C, L.P. · CIK 0001634809 · 10% owner

EnerVest Investment Services, L.L.C. · CIK 0001749921 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,004,226

F15 · shares: Represents shares of Class A Common Stock sold in a transaction exempt from registration pursuant to Rule 144 under the Securities Act of 1933, as amended (the "144 Sale"), as follows: (i) 728,276 shares of Class A Common Stock sold by EV XIV-A; (ii) 7,608 shares of Class A Common Stock sold by EV XIV-WIC; (iii) 139,369 shares of Class A Common Stock sold by EV XIV-2A; (iv) 143,773 shares of Class A Common Stock sold by EV XIV-3A; (v) 81,353 shares of Class A Common Stock sold by EV XIV-C-AIV; and (vi) 6,499,621 shares of Class A Common Stock sold by EV XIV-C.

F7 · price: This amount represents the purchase price in the 144 Sale (as defined below). The Record Holders, other than EV XIV-C, also used this price per share for the purchase price of the shares of Class B Common Stock under the June 2021 Transfer.

F2 · balance_after: EnerVest Management GP, L.C. ("EVM GP") is the general partner of EnerVest, Ltd. ("EnerVest"), which is the sole member, with sole control over the actions of, each of, EVFA GP XIV, LLC, EVFA XIV-2A, LLC and EVFA XIV-3A, LLC, the managing general partners, respectively, of EnerVest Energy Institutional Fund XIV-A, L.P. ("EV XIV-A"), EnerVest Energy Institutional Fund XIV-2A, L.P. ("EV XIV-2A") and EnerVest Energy Institutional Fund XIV-3A, L.P. ("EV XIV-3A"). EnerVest is also the sole member, with sole control over the actions of, each of, EnerVest Holding XIV, LLC, the general partner of EnerVest Energy Institutional Fund XIV-WIC, L.P. ("EV XIV-WIC"), EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C-AIV, L.P. ("EV XIV-C-AIV"), and EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C, L.P. ("EV XIV-C").

F3 · balance_after: EnerVest Investment Services, L.L.C. ("EIS, LLC") is the investment advisor for EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, EV XIV-C-AIV and EV XIV-C (such six entities together, the "Record Holders" and each, a "Record Holder").

F10 · balance_after: Each Record Holder and each of EVM GP, EnerVest, EVFA GP XIV, LLC, EVFA XIV-2A, LLC, EVFA XIV-3A, LLC, EnerVest Holding XIV, LLC, EVFC GP XIV, LLC, and EIS, LLC (collectively, the "Non-Fund Entities") directly (whether through ownership or position) or indirectly through one or more intermediaries, may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, to be the indirect beneficial owner of some or all of the Equity Interests (as defined below) owned by the Record Holders and, therefore, a "ten percent holder" hereunder.

F11 · balance_after: Each Record Holder and each Non-Fund Entity disclaims beneficial ownership of the Equity Interests reported herein, except to the extent of its pecuniary interest therein, and, with respect to each of the Record Holders, except to the extent of its respective direct ownership reported herein, and this report shall not be deemed an admission that the Reporting Persons are the beneficial owners of such securities for purposes of Section 16 or for any other purposes.

F14 · balance_after: EV XIV-C owns of record 23,004,226 shares of Class A Common Stock.

SEC source: 0001104659-21-083587 · tm2120217-2_4seq1.xml · nonDerivative · entry 1

EnerVest, Ltd. · CIK 0001375345 · Director · 10% owner

EnerVest Management GP, L.C. · CIK 0001749934 · 10% owner

EnerVest Energy Institutional Fund XIV-A, L.P. · CIK 0001634806 · 10% owner

EnerVest Energy Institutional Fund XIV-2A, L.P. · CIK 0001674589 · 10% owner

EnerVest Energy Institutional Fund XIV-3A, L.P. · CIK 0001677997 · 10% owner

EnerVest Energy Institutional Fund XIV-WIC, L.P. · CIK 0001749857 · 10% owner

EnerVest Energy Institutional Fund XIV-C-AIV, L.P. · CIK 0001749935 · 10% owner

EnerVest Energy Institutional Fund XIV-C, L.P. · CIK 0001634809 · 10% owner

EnerVest Investment Services, L.L.C. · CIK 0001749921 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,604,226

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

F4 · shares: Represents: (i) 728,276 shares of Class B Common Stock held by EV XIV-A converted to the same number of shares of Class A Common Stock; (ii) 7,608 shares of Class B Common Stock held by EV XIV-WIC converted to the same number of shares of Class A Common Stock; (iii) 139,369 shares of Class B Common Stock held by EV XIV-2A converted to the same number of shares of Class A Common Stock; (iv) 143,773 shares of Class B Common Stock held by EV XIV-3A converted to the same number of shares of Class A Common Stock; and (v) 81,353 shares of Class B Common Stock held by EV XIV-C-AIV converted to the same number of shares of Class A Common Stock (collectively, the "June 2021 Conversion Shares").

F1 · price: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F2 · balance_after: EnerVest Management GP, L.C. ("EVM GP") is the general partner of EnerVest, Ltd. ("EnerVest"), which is the sole member, with sole control over the actions of, each of, EVFA GP XIV, LLC, EVFA XIV-2A, LLC and EVFA XIV-3A, LLC, the managing general partners, respectively, of EnerVest Energy Institutional Fund XIV-A, L.P. ("EV XIV-A"), EnerVest Energy Institutional Fund XIV-2A, L.P. ("EV XIV-2A") and EnerVest Energy Institutional Fund XIV-3A, L.P. ("EV XIV-3A"). EnerVest is also the sole member, with sole control over the actions of, each of, EnerVest Holding XIV, LLC, the general partner of EnerVest Energy Institutional Fund XIV-WIC, L.P. ("EV XIV-WIC"), EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C-AIV, L.P. ("EV XIV-C-AIV"), and EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C, L.P. ("EV XIV-C").

F3 · balance_after: EnerVest Investment Services, L.L.C. ("EIS, LLC") is the investment advisor for EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, EV XIV-C-AIV and EV XIV-C (such six entities together, the "Record Holders" and each, a "Record Holder").

F5 · balance_after: Represents the June 2021 Conversion Shares and 29,503,847 shares of Class A Common Stock held by EV XIV-C.

F10 · balance_after: Each Record Holder and each of EVM GP, EnerVest, EVFA GP XIV, LLC, EVFA XIV-2A, LLC, EVFA XIV-3A, LLC, EnerVest Holding XIV, LLC, EVFC GP XIV, LLC, and EIS, LLC (collectively, the "Non-Fund Entities") directly (whether through ownership or position) or indirectly through one or more intermediaries, may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, to be the indirect beneficial owner of some or all of the Equity Interests (as defined below) owned by the Record Holders and, therefore, a "ten percent holder" hereunder.

F11 · balance_after: Each Record Holder and each Non-Fund Entity disclaims beneficial ownership of the Equity Interests reported herein, except to the extent of its pecuniary interest therein, and, with respect to each of the Record Holders, except to the extent of its respective direct ownership reported herein, and this report shall not be deemed an admission that the Reporting Persons are the beneficial owners of such securities for purposes of Section 16 or for any other purposes.

SEC source: 0001104659-21-083590 · tm2120217-3_4seq1.xml · derivative · entry 5

Walker John B · CIK 0001374442 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Footnotes

Disclosed balance after: 60,523,656

Underlying: Class A Common Stock · 5,000,000 shares

Expires not disclosed

F1 · derivative.exercise_price: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F9 · shares: Represents: (i) 3,309,206 shares of Class B Common Stock transferred by EV XIV-A; (ii) 34,570 shares of Class B Common Stock transferred by EV XIV-WIC; (iii) 633,277 shares of Class B Common Stock transferred by EV XIV-2A; (iv) 653,290 shares of Class B Common Stock transferred by EV XIV-3A; and (v) 369,657 shares of Class B Common Stock transferred by EV XIV-C-AIV (collectively, the "June 2021 Transfer").

F8 · price: This amount represents the purchase price in the 144 Sale (as defined below). The Record Holders, other than EV XIV-C, also used this price per share for the purchase price of the shares of Class B Common Stock under the June 2021 Transfer.

F1 · derivative.exercise_date: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F10 · derivative.expiration_date: Not applicable.

F9 · derivative.underlying_shares: Represents: (i) 3,309,206 shares of Class B Common Stock transferred by EV XIV-A; (ii) 34,570 shares of Class B Common Stock transferred by EV XIV-WIC; (iii) 633,277 shares of Class B Common Stock transferred by EV XIV-2A; (iv) 653,290 shares of Class B Common Stock transferred by EV XIV-3A; and (v) 369,657 shares of Class B Common Stock transferred by EV XIV-C-AIV (collectively, the "June 2021 Transfer").

F12 · balance_after: Represents the aggregate number of shares of Class B Common Stock owned by EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, and EV XIV-C-AIV. (EV XIV-C's shares of Class A Common Stock, together with the shares of Class B Common Stock and Units held by EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, and EV XIV-C-AIV, are collectively referred to herein as the "Equity Interests.")

F13 · balance_after: EV XIV-A owns of record 40,057,048 shares of Class B Common Stock; EV XIV-2A owns of record 7,665,650 shares of Class B Common Stock; EV XIV-3A owns of record 7,907,900 shares of Class B Common Stock; EV XIV-WIC owns of record 418,457 shares of Class B Common Stock; and EV XIV-C-AIV owns of record 4,474,601 shares of Class B Common Stock.

F2 · ownership.nature: EnerVest Management GP, L.C. ("EVM GP") is the general partner of EnerVest, Ltd. ("EnerVest"), which is the sole member, with sole control over the actions of, each of, EVFA GP XIV, LLC, EVFA XIV-2A, LLC and EVFA XIV-3A, LLC, the managing general partners, respectively, of EnerVest Energy Institutional Fund XIV-A, L.P. ("EV XIV-A"), EnerVest Energy Institutional Fund XIV-2A, L.P. ("EV XIV-2A") and EnerVest Energy Institutional Fund XIV-3A, L.P. ("EV XIV-3A").

F3 · ownership.nature: EnerVest is also the sole member, with sole control over the actions of, each of, EnerVest Holding XIV, LLC, the general partner of EnerVest Energy Institutional Fund XIV-WIC, L.P. ("EV XIV-WIC"), EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C-AIV, L.P. ("EV XIV-C-AIV"), and EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C, L.P. ("EV XIV-C"). (EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, EV XIV-C-AIV and EV XIV-C together, the "Record Holders"). Mr. Walker is an indirect owner and the Executive Chairman of EVM GP.

F11 · ownership.nature: Mr. Walker directly (whether through ownership or position) or indirectly through one or more intermediaries, may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, to be the indirect beneficial owner of the Equity Interests (as defined below) owned by the Record Holders. Mr. Walker disclaims beneficial ownership of the Equity Interests held by each of the Record Holders except to the extent of his pecuniary interest in each of the Record Holders and this report shall not be deemed an admission that he is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001104659-21-083590 · tm2120217-3_4seq1.xml · derivative · entry 4

Walker John B · CIK 0001374442 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Footnotes

Disclosed balance after: 65,523,656

Underlying: Class A Common Stock · 1,100,379 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F4 · shares: Represents: (i) 728,276 shares of Class B Common Stock held by EV XIV-A converted to the same number of shares of Class A Common Stock; (ii) 7,608 shares of Class B Common Stock held by EV XIV-WIC converted to the same number of shares of Class A Common Stock; (iii) 139,369 shares of Class B Common Stock held by EV XIV-2A converted to the same number of shares of Class A Common Stock; (iv) 143,773 shares of Class B Common Stock held by EV XIV-3A converted to the same number of shares of Class A Common Stock; and (v) 81,353 shares of Class B Common Stock held by EV XIV-C-AIV converted to the same number of shares of Class A Common Stock (collectively, the "June 2021 Conversion Shares").

F1 · price: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F1 · derivative.exercise_date: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F10 · derivative.expiration_date: Not applicable.

F4 · derivative.underlying_shares: Represents: (i) 728,276 shares of Class B Common Stock held by EV XIV-A converted to the same number of shares of Class A Common Stock; (ii) 7,608 shares of Class B Common Stock held by EV XIV-WIC converted to the same number of shares of Class A Common Stock; (iii) 139,369 shares of Class B Common Stock held by EV XIV-2A converted to the same number of shares of Class A Common Stock; (iv) 143,773 shares of Class B Common Stock held by EV XIV-3A converted to the same number of shares of Class A Common Stock; and (v) 81,353 shares of Class B Common Stock held by EV XIV-C-AIV converted to the same number of shares of Class A Common Stock (collectively, the "June 2021 Conversion Shares").

F7 · balance_after: Represents shares of Class B Common Stock held (prior to giving effect to the June 2021 Transfer (defined below)) as follows: (i) 43,366,254 shares of Class B Common Stock held by EV XIV-A; (ii) 453,027 shares of Class B Common Stock held by EV XIV-WIC; (iii) 8,298,927 shares of Class B Common Stock held by EV XIV-2A; (iv) 8,561,190 shares of Class B Common Stock held by EV XIV-3A; and (v) 4,844,258 shares of Class B Common Stock held by EV XIV-C-AIV.

F12 · balance_after: Represents the aggregate number of shares of Class B Common Stock owned by EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, and EV XIV-C-AIV. (EV XIV-C's shares of Class A Common Stock, together with the shares of Class B Common Stock and Units held by EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, and EV XIV-C-AIV, are collectively referred to herein as the "Equity Interests.")

F2 · ownership.nature: EnerVest Management GP, L.C. ("EVM GP") is the general partner of EnerVest, Ltd. ("EnerVest"), which is the sole member, with sole control over the actions of, each of, EVFA GP XIV, LLC, EVFA XIV-2A, LLC and EVFA XIV-3A, LLC, the managing general partners, respectively, of EnerVest Energy Institutional Fund XIV-A, L.P. ("EV XIV-A"), EnerVest Energy Institutional Fund XIV-2A, L.P. ("EV XIV-2A") and EnerVest Energy Institutional Fund XIV-3A, L.P. ("EV XIV-3A").

F3 · ownership.nature: EnerVest is also the sole member, with sole control over the actions of, each of, EnerVest Holding XIV, LLC, the general partner of EnerVest Energy Institutional Fund XIV-WIC, L.P. ("EV XIV-WIC"), EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C-AIV, L.P. ("EV XIV-C-AIV"), and EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C, L.P. ("EV XIV-C"). (EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, EV XIV-C-AIV and EV XIV-C together, the "Record Holders"). Mr. Walker is an indirect owner and the Executive Chairman of EVM GP.

F11 · ownership.nature: Mr. Walker directly (whether through ownership or position) or indirectly through one or more intermediaries, may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, to be the indirect beneficial owner of the Equity Interests (as defined below) owned by the Record Holders. Mr. Walker disclaims beneficial ownership of the Equity Interests held by each of the Record Holders except to the extent of his pecuniary interest in each of the Record Holders and this report shall not be deemed an admission that he is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001104659-21-083590 · tm2120217-3_4seq1.xml · nonDerivative · entry 2

Walker John B · CIK 0001374442 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Footnotes

Disclosed balance after: 23,004,226

F15 · shares: Represents shares of Class A Common Stock sold in a transaction exempt from registration pursuant to Rule 144 under the Securities Act of 1933, as amended (the "144 Sale"), as follows: (i) 728,276 shares of Class A Common Stock sold by EV XIV-A; (ii) 7,608 shares of Class A Common Stock sold by EV XIV-WIC; (iii) 139,369 shares of Class A Common Stock sold by EV XIV-2A; (iv) 143,773 shares of Class A Common Stock sold by EV XIV-3A; (v) 81,353 shares of Class A Common Stock sold by EV XIV-C-AIV; and (vi) 6,499,621 shares of Class A Common Stock sold by EV XIV-C.

F8 · price: This amount represents the purchase price in the 144 Sale (as defined below). The Record Holders, other than EV XIV-C, also used this price per share for the purchase price of the shares of Class B Common Stock under the June 2021 Transfer.

F14 · balance_after: EV XIV-C owns of record 23,004,226 shares of Class A Common Stock.

F2 · ownership.nature: EnerVest Management GP, L.C. ("EVM GP") is the general partner of EnerVest, Ltd. ("EnerVest"), which is the sole member, with sole control over the actions of, each of, EVFA GP XIV, LLC, EVFA XIV-2A, LLC and EVFA XIV-3A, LLC, the managing general partners, respectively, of EnerVest Energy Institutional Fund XIV-A, L.P. ("EV XIV-A"), EnerVest Energy Institutional Fund XIV-2A, L.P. ("EV XIV-2A") and EnerVest Energy Institutional Fund XIV-3A, L.P. ("EV XIV-3A").

F3 · ownership.nature: EnerVest is also the sole member, with sole control over the actions of, each of, EnerVest Holding XIV, LLC, the general partner of EnerVest Energy Institutional Fund XIV-WIC, L.P. ("EV XIV-WIC"), EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C-AIV, L.P. ("EV XIV-C-AIV"), and EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C, L.P. ("EV XIV-C"). (EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, EV XIV-C-AIV and EV XIV-C together, the "Record Holders"). Mr. Walker is an indirect owner and the Executive Chairman of EVM GP.

F11 · ownership.nature: Mr. Walker directly (whether through ownership or position) or indirectly through one or more intermediaries, may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, to be the indirect beneficial owner of the Equity Interests (as defined below) owned by the Record Holders. Mr. Walker disclaims beneficial ownership of the Equity Interests held by each of the Record Holders except to the extent of his pecuniary interest in each of the Record Holders and this report shall not be deemed an admission that he is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001104659-21-083590 · tm2120217-3_4seq1.xml · nonDerivative · entry 1

Walker John B · CIK 0001374442 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Footnotes

Disclosed balance after: 30,604,226

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

F4 · shares: Represents: (i) 728,276 shares of Class B Common Stock held by EV XIV-A converted to the same number of shares of Class A Common Stock; (ii) 7,608 shares of Class B Common Stock held by EV XIV-WIC converted to the same number of shares of Class A Common Stock; (iii) 139,369 shares of Class B Common Stock held by EV XIV-2A converted to the same number of shares of Class A Common Stock; (iv) 143,773 shares of Class B Common Stock held by EV XIV-3A converted to the same number of shares of Class A Common Stock; and (v) 81,353 shares of Class B Common Stock held by EV XIV-C-AIV converted to the same number of shares of Class A Common Stock (collectively, the "June 2021 Conversion Shares").

F1 · price: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F5 · balance_after: Represents the June 2021 Conversion Shares and 29,503,847 shares of Class A Common Stock held by EV XIV-C.

F2 · ownership.nature: EnerVest Management GP, L.C. ("EVM GP") is the general partner of EnerVest, Ltd. ("EnerVest"), which is the sole member, with sole control over the actions of, each of, EVFA GP XIV, LLC, EVFA XIV-2A, LLC and EVFA XIV-3A, LLC, the managing general partners, respectively, of EnerVest Energy Institutional Fund XIV-A, L.P. ("EV XIV-A"), EnerVest Energy Institutional Fund XIV-2A, L.P. ("EV XIV-2A") and EnerVest Energy Institutional Fund XIV-3A, L.P. ("EV XIV-3A").

F3 · ownership.nature: EnerVest is also the sole member, with sole control over the actions of, each of, EnerVest Holding XIV, LLC, the general partner of EnerVest Energy Institutional Fund XIV-WIC, L.P. ("EV XIV-WIC"), EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C-AIV, L.P. ("EV XIV-C-AIV"), and EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C, L.P. ("EV XIV-C"). (EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, EV XIV-C-AIV and EV XIV-C together, the "Record Holders"). Mr. Walker is an indirect owner and the Executive Chairman of EVM GP.

F11 · ownership.nature: Mr. Walker directly (whether through ownership or position) or indirectly through one or more intermediaries, may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, to be the indirect beneficial owner of the Equity Interests (as defined below) owned by the Record Holders. Mr. Walker disclaims beneficial ownership of the Equity Interests held by each of the Record Holders except to the extent of his pecuniary interest in each of the Record Holders and this report shall not be deemed an admission that he is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001209191-21-037156 · doc4.xml · nonDerivative · entry 1

Yang Timothy D. · CIK 0001627951 · EVP - General Counsel & Sec

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 499,276

SEC source: 0001209191-21-030404 · doc4.xml · derivative · entry 4

Chase Valerie · CIK 0001748399 · VP - CAO & Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 19,527 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Ms. Chase's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Ms. Chase's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.exercise_date: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Ms. Chase's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.expiration_date: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Ms. Chase's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.underlying_shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Ms. Chase's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

SEC source: 0001209191-21-030404 · doc4.xml · derivative · entry 3

Chase Valerie · CIK 0001748399 · VP - CAO & Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 18,327 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Ms. Chase's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Ms. Chase's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.exercise_date: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Ms. Chase's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.expiration_date: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Ms. Chase's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.underlying_shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Ms. Chase's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

SEC source: 0001209191-21-030404 · doc4.xml · nonDerivative · entry 2

Chase Valerie · CIK 0001748399 · VP - CAO & Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 97,799

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

F1 · shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Ms. Chase's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · price: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Ms. Chase's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

SEC source: 0001209191-21-030404 · doc4.xml · nonDerivative · entry 1

Chase Valerie · CIK 0001748399 · VP - CAO & Controller

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 78,272

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

F1 · shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Ms. Chase's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · price: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Ms. Chase's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

SEC source: 0001209191-21-030412 · doc4.xml · derivative · entry 5

Yang Timothy D. · CIK 0001627951 · EVP - General Counsel & Sec

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 78,124 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Yang's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Yang's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.exercise_date: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Yang's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.expiration_date: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Yang's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.underlying_shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Yang's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

SEC source: 0001209191-21-030412 · doc4.xml · derivative · entry 4

Yang Timothy D. · CIK 0001627951 · EVP - General Counsel & Sec

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 76,924 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Yang's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Yang's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.exercise_date: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Yang's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.expiration_date: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Yang's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.underlying_shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Yang's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

SEC source: 0001209191-21-030412 · doc4.xml · nonDerivative · entry 3

Yang Timothy D. · CIK 0001627951 · EVP - General Counsel & Sec

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 501,464

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

F1 · shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Yang's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · price: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Yang's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

SEC source: 0001209191-21-030412 · doc4.xml · nonDerivative · entry 2

Yang Timothy D. · CIK 0001627951 · EVP - General Counsel & Sec

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 423,340

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

F1 · shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Yang's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · price: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Yang's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

SEC source: 0001209191-21-030409 · doc4.xml · derivative · entry 4

Stavros Christopher G · CIK 0001613357 · Executive VP, CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 110,520 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Stavros's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Stavros's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.exercise_date: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Stavros's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.expiration_date: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Stavros's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.underlying_shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Stavros's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

SEC source: 0001209191-21-030409 · doc4.xml · derivative · entry 3

Stavros Christopher G · CIK 0001613357 · Executive VP, CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 109,320 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Stavros's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Stavros's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.exercise_date: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Stavros's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.expiration_date: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Stavros's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.underlying_shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Stavros's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

SEC source: 0001209191-21-030409 · doc4.xml · nonDerivative · entry 2

Stavros Christopher G · CIK 0001613357 · Executive VP, CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 636,997

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

F1 · shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Stavros's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · price: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Stavros's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

SEC source: 0001209191-21-030409 · doc4.xml · nonDerivative · entry 1

Stavros Christopher G · CIK 0001613357 · Executive VP, CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 526,477

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

F1 · shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Stavros's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · price: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Stavros's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

SEC source: 0001209191-21-030406 · doc4.xml · derivative · entry 4

Millican Steve · CIK 0001757696 · SVP - Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 43,268 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Millican's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Millican's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.exercise_date: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Millican's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.expiration_date: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Millican's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.underlying_shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Millican's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

SEC source: 0001209191-21-030406 · doc4.xml · derivative · entry 3

Millican Steve · CIK 0001757696 · SVP - Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 42,068 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Millican's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Millican's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.exercise_date: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Millican's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.expiration_date: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Millican's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · derivative.underlying_shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Millican's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

SEC source: 0001209191-21-030406 · doc4.xml · nonDerivative · entry 2

Millican Steve · CIK 0001757696 · SVP - Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 274,808

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

F1 · shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Millican's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · price: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Millican's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

SEC source: 0001209191-21-030406 · doc4.xml · nonDerivative · entry 1

Millican Steve · CIK 0001757696 · SVP - Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 231,540

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

F1 · shares: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Millican's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

F1 · price: Reflects performance restricted stock units ("PRSUs"), the grant of which was previously reported in Table II of Mr. Millican's Form 4 filed on February 22, 2021 (the "Prior Form 4"). On May 4, 2021, the Compensation Committee certified the achievement of the specified stock appreciation goal, and these PRSUs are no longer subject to performance vesting conditions; however, the target number of PRSUs reported above remains subject to the applicable service-based vesting conditions previously disclosed in the Prior Form 4.

SEC source: 0001209191-21-030659 · doc4.xml · nonDerivative · entry 1

DJEREJIAN EDWARD P · CIK 0001173584 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 101,320

F1 · shares: Reflects restricted stock units ("RSUs") granted under the Magnolia Oil & Gas Corporation Long Term Incentive Plan. Each RSU represents a contingent right to receive one share of Class A common stock of Magnolia Oil & Gas Corporation (the "Company"). The RSUs will vest on the earlier of (a) the day preceding the next annual meeting of stockholders of the Company at which directors are elected, or (b) the first anniversary of the grant date, in each case, subject to the director's continued service through the applicable vesting date.

SEC source: 0001209191-21-030664 · doc4.xml · nonDerivative · entry 2

Walker John B · CIK 0001374442 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 596,320

F2 · shares: Reflects restricted stock units ("RSUs") granted under the Magnolia Oil & Gas Corporation Long Term Incentive Plan. Each RSU represents a contingent right to receive one share of Class A common stock of Magnolia Oil & Gas Corporation (the "Company"). The RSUs will vest on the earlier of (a) the day preceding the next annual meeting of stockholders of the Company at which directors are elected, or (b) the first anniversary of the grant date, in each case, subject to the director's continued service through the applicable vesting date.

SEC source: 0001209191-21-030660 · doc4.xml · nonDerivative · entry 1

LARSON JAMES R · CIK 0001221981 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 62,870

F1 · shares: Reflects restricted stock units ("RSUs") granted under the Magnolia Oil & Gas Corporation Long Term Incentive Plan. Each RSU represents a contingent right to receive one share of Class A common stock of Magnolia Oil & Gas Corporation (the "Company"). The RSUs will vest on the earlier of (a) the day preceding the next annual meeting of stockholders of the Company at which directors are elected, or (b) the first anniversary of the grant date, in each case, subject to the director's continued service through the applicable vesting date.

SEC source: 0001209191-21-030662 · doc4.xml · nonDerivative · entry 1

SMITH DAN F · CIK 0001188511 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 101,320

F1 · shares: Reflects restricted stock units ("RSUs") granted under the Magnolia Oil & Gas Corporation Long Term Incentive Plan. Each RSU represents a contingent right to receive one share of Class A common stock of Magnolia Oil & Gas Corporation (the "Company"). The RSUs will vest on the earlier of (a) the day preceding the next annual meeting of stockholders of the Company at which directors are elected, or (b) the first anniversary of the grant date, in each case, subject to the director's continued service through the applicable vesting date.

SEC source: 0001209191-21-030657 · doc4.xml · nonDerivative · entry 1

Acosta Arcilia · CIK 0001629039 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 119,270

F1 · shares: Reflects restricted stock units ("RSUs") granted under the Magnolia Oil & Gas Corporation Long Term Incentive Plan. Each RSU represents a contingent right to receive one share of Class A common stock of Magnolia Oil & Gas Corporation (the "Company"). The RSUs will vest on the earlier of (a) the day preceding the next annual meeting of stockholders of the Company at which directors are elected, or (b) the first anniversary of the grant date, in each case, subject to the director's continued service through the applicable vesting date.

SEC source: 0001209191-21-030658 · doc4.xml · nonDerivative · entry 1

Busch Angela M · CIK 0001740094 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 83,820

F1 · shares: Reflects restricted stock units ("RSUs") granted under the Magnolia Oil & Gas Corporation Long Term Incentive Plan. Each RSU represents a contingent right to receive one share of Class A common stock of Magnolia Oil & Gas Corporation (the "Company"). The RSUs will vest on the earlier of (a) the day preceding the next annual meeting of stockholders of the Company at which directors are elected, or (b) the first anniversary of the grant date, in each case, subject to the director's continued service through the applicable vesting date.

SEC source: 0001209191-21-030412 · doc4.xml · nonDerivative · entry 1

Yang Timothy D. · CIK 0001627951 · EVP - General Counsel & Sec

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 346,416

SEC source: 0001209191-21-025705 · doc4.xml · nonDerivative · entry 1

Yang Timothy D. · CIK 0001627951 · EVP - General Counsel & Sec

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 348,602

SEC source: 0001104659-21-034017 · tm219222d1_4.xml · derivative · entry 4

EnerVest, Ltd. · CIK 0001375345 · Director · 10% owner

EnerVest Management GP, L.C. · CIK 0001749934 · 10% owner

EnerVest Energy Institutional Fund XIV-A, L.P. · CIK 0001634806 · 10% owner

EnerVest Energy Institutional Fund XIV-2A, L.P. · CIK 0001674589 · 10% owner

EnerVest Energy Institutional Fund XIV-3A, L.P. · CIK 0001677997 · 10% owner

EnerVest Energy Institutional Fund XIV-WIC, L.P. · CIK 0001749857 · 10% owner

EnerVest Energy Institutional Fund XIV-C-AIV, L.P. · CIK 0001749935 · 10% owner

EnerVest Energy Institutional Fund XIV-C, L.P. · CIK 0001634809 · 10% owner

EnerVest Investment Services, L.L.C. · CIK 0001749921 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 66,624,035

Underlying: Class A Common Stock · 5,000,000 shares

Expires not disclosed

F1 · derivative.exercise_price: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F8 · derivative.exercise_price: Represents: (i) 3,309,206 shares of Class B Common Stock transferred to the Issuer by EV XIV-A; (ii) 34,570 shares of Class B Common Stock transferred to the Issuer by EV XIV-WIC; (iii) 633,277 shares of Class B Common Stock transferred to the Issuer by EV XIV-2A; (iv) 653,290 shares of Class B Common Stock transferred to the Issuer by EV XIV-3A; and (v) 910,693 shares of Class B Common Stock transferred to the Issuer by EV XIV-C-AIV (collectively, the "Issuer Transfer").

F8 · shares: Represents: (i) 3,309,206 shares of Class B Common Stock transferred to the Issuer by EV XIV-A; (ii) 34,570 shares of Class B Common Stock transferred to the Issuer by EV XIV-WIC; (iii) 633,277 shares of Class B Common Stock transferred to the Issuer by EV XIV-2A; (iv) 653,290 shares of Class B Common Stock transferred to the Issuer by EV XIV-3A; and (v) 910,693 shares of Class B Common Stock transferred to the Issuer by EV XIV-C-AIV (collectively, the "Issuer Transfer").

F7 · price: This amount represents the $10.50 secondary public offering price per share of Class A Common Stock less the underwriting discount of $0.34375 per share for shares sold pursuant to an underwritten public offering. The Issuer and the Record Holders, other than EV XIV-C, also used this price per share for the purchase price of the shares of Class B Common Stock under the Issuer Transfer.

F1 · derivative.exercise_date: Shares of the Issuer's Class B Common Stock ("Class B Common Stock"), when combined with an equal number of units ("Units") of Magnolia Oil & Gas Parent LLC, a Delaware limited liability company of which the Issuer is the managing member, are exchangeable from time to time at the option of the holders thereof for shares of the Issuer's Class A Common Stock ("Class A Common Stock") on a one-for-one basis (or, at the Issuer's option, for cash).

F9 · derivative.expiration_date: Not applicable.

F8 · derivative.underlying_shares: Represents: (i) 3,309,206 shares of Class B Common Stock transferred to the Issuer by EV XIV-A; (ii) 34,570 shares of Class B Common Stock transferred to the Issuer by EV XIV-WIC; (iii) 633,277 shares of Class B Common Stock transferred to the Issuer by EV XIV-2A; (iv) 653,290 shares of Class B Common Stock transferred to the Issuer by EV XIV-3A; and (v) 910,693 shares of Class B Common Stock transferred to the Issuer by EV XIV-C-AIV (collectively, the "Issuer Transfer").

F2 · balance_after: EnerVest Management GP, L.C. ("EVM GP") is the general partner of EnerVest, Ltd. ("EnerVest"), which is the sole member, with sole control over the actions of, each of, EVFA GP XIV, LLC, EVFA XIV-2A, LLC and EVFA XIV-3A, LLC, the managing general partners, respectively, of EnerVest Energy Institutional Fund XIV-A, L.P. ("EV XIV-A"), EnerVest Energy Institutional Fund XIV-2A, L.P. ("EV XIV-2A") and EnerVest Energy Institutional Fund XIV-3A, L.P. ("EV XIV-3A"). EnerVest is also the sole member, with sole control over the actions of, each of, EnerVest Holding XIV, LLC, the general partner of EnerVest Energy Institutional Fund XIV-WIC, L.P. ("EV XIV-WIC"), EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C-AIV, L.P. ("EV XIV-C-AIV"), and EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C, L.P. ("EV XIV-C").

F3 · balance_after: EnerVest Investment Services, L.L.C. ("EIS, LLC") is the investment advisor for EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, EV XIV-C-AIV and EV XIV-C (such six entities together, the "Record Holders" and each, a "Record Holder").

F10 · balance_after: Each Record Holder and each of EVM GP, EnerVest, EVFA GP XIV, LLC, EVFA XIV-2A, LLC, EVFA XIV-3A, LLC, EnerVest Holding XIV, LLC, EVFC GP XIV, LLC, and EIS, LLC (collectively, the "Non-Fund Entities") directly (whether through ownership or position) or indirectly through one or more intermediaries, may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, to be the indirect beneficial owner of some or all of the Equity Interests (as defined below) owned by the Record Holders and, therefore, a "ten percent holder" hereunder.

F11 · balance_after: Each Record Holder and each Non-Fund Entity disclaims beneficial ownership of the Equity Interests reported herein, except to the extent of its pecuniary interest therein, and, with respect to each of the Record Holders, except to the extent of its respective direct ownership reported herein, and this report shall not be deemed an admission that the Reporting Persons are the beneficial owners of such securities for purposes of Section 16 or for any other purposes.

F12 · balance_after: Represents the aggregate number of shares of Class B Common Stock owned by EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, and EV XIV-C-AIV. (EV XIV-C's shares of Class A Common Stock, together with the shares of Class B Common Stock and Units held by EV XIV-A, EV XIV-2A, EV XIV-3A, EV XIV-WIC, and EV XIV-C-AIV, are collectively referred to herein as the "Equity Interests.")

F13 · balance_after: EV XIV-A owns of record 44,094,530 shares of Class B Common Stock; EV XIV-2A owns of record 8,438,296 shares of Class B Common Stock; EV XIV-3A owns of record 8,704,963 shares of Class B Common Stock; EV XIV-WIC owns of record 460,635 shares of Class B Common Stock; and EV XIV-C-AIV owns of record 4,925,611 shares of Class B Common Stock.