X0306 4 2019-08-01 0 0001698990 Magnolia Oil & Gas Corp MGY 0001748399 Chase Valerie C/O MAGNOLIA OIL & GAS CORPORATION NINE GREENWAY PLAZA, SUITE 1300 HOUSTON TX 77046 0 1 0 0 VP - CAO & Controller Class A Common Stock 2019-08-01 4 F 0 893 10.36 D 27032 D Class A Common Stock 2018-07-31 4 M 0 16500 A 43532 D Performance Share Units 2018-07-31 4 M 0 11000 0.00 D Class A Common Stock 16500 0 D Reflects performance share units ("PSUs") previously granted under the Magnolia Oil & Gas Corporation Long Term Incentive Plan (the "Plan") and reported in Table II of Ms. Chase's Form 4 filed on August 2, 2018 (the "Prior Form 4"). These PSUs are no longer subject to performance vesting conditions; however, the PSUs remain subject to the time-based vesting conditions previously disclosed in the Prior Form 4. As such, the 11,000 PSUs initially granted now represent a contingent right to receive 16,500 shares of Class A Common Stock, subject to the officer's continued employment through the applicable vesting date. /s/ Timothy D. Yang, as Attorney-in-Fact 2019-08-05