X0306 4 2018-09-13 0 0001698990 Magnolia Oil & Gas Corp MGY 0001026545 CHAZEN STEPHEN I 1001 FANNIN STREET SUITE 400 HOUSTON TX 77002 1 1 0 0 Chairman, President & CEO Class A Common Stock 2018-09-13 4 P 0 10000 13.94 A 1700931 D Warrants (option to buy) 11.50 2018-09-13 4 P 0 20900 A 2018-09-13 2023-07-31 Class A Common Stock 20900 121952.33 D On September 13, 2018, Mr. Chazen acquired, at a weighted average price of $3.99956938 per warrant, 20,900 of the issuer's publicly traded warrants. Such warrants were purchased in multiple transactions at prices ranging from $3.99 to $4.00, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of warrants acquired at each separate price within the range set forth in this footnote (1). Joan M. Gallagher is signing on behalf Mr. Chazen pursuant to the Power of Attorney dated July 31, 2018, which was previously filed with the Securities and Exchange Commission. /s/ Joan M. Gallagher, as Attorney-in-Fact 2018-09-17