Sec Form 4 Filing - Walker John B @ Magnolia Oil & Gas Corp - 2020-05-04

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Walker John B 2. Issuer Name and Ticker or Trading Symbol Magnolia Oil & Gas Corp [ MGY] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O ENERVEST LTD., 1001 FANNIN STREET, SUITE 800 3. Date of Earliest Transaction (MM/DD/YY) 05/04/2020 (Street) HOUSTON, TX77002 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Stock 34,888,068 I See Explanation of Responses ( 1 ) Class A Common Stock 160,000 D Class A Common Stock 05/04/2020 A 27,837 ( 2 ) A $ 0 49,798 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Walker John B C/O ENERVEST LTD. 1001 FANNIN STREET, SUITE 800 HOUSTON, TX77002 X X Signatures /s/ John B. Walker 05/06/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )EnerVest Management GP, L.C. ("EVM GP") is general partner of EnerVest Ltd. ("EnerVest"), which is sole member, with sole control over the actions of, EVFC GP XIV, LLC, the managing general partner of EnerVest Energy Institutional Fund XIV-C, L.P. ("EV XIV-C"). EV XIV-C owns of record the 34,888,068 shares of Class A Common Stock (the "Reported Securities"). Mr. Walker is an indirect owner and Chief Executive Officer of EVM GP. Mr. Walker directly (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 to be the indirect beneficial owner of the Reported Securities owned by EV XIV-C. Mr. Walker disclaims beneficial ownership of the Reported Securities held by EV XIV-C except to the extent of his pecuniary interest in EV XIV-C. 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. ( 2 )Reflects restricted stock units ("RSUs") granted under the Magnolia Oil & Gas Corporation Long Term Incentive Plan (the "Plan"). Each RSU represents a contingent right to receive one share of Class A common stock ("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.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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