X0306 4 2020-09-22 0 0001698990 Magnolia Oil & Gas Corp MGY 0001026545 CHAZEN STEPHEN I C/O MAGNOLIA OIL & GAS CORPORATION NINE GREENWAY PLAZA, SUITE 1300 HOUSTON TX 77046 1 1 0 0 Chairman, President & CEO Class A Common Stock 2020-09-22 4 P 0 35000 5.5928 A 6945318 D The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $5.5770 to $5.6057 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. The number of securities beneficially owned following the reported transactions includes 3,733 shares acquired under the Magnolia Oil & Gas Corporation Stock Purchase Program during the period July 2, 2020 through September 11, 2020. /s/ Timothy D. Yang as Attorney-in-Fact 2020-09-23