On January 7, 2019, Alta Mesa Resources, Inc. hired John C. Regan to be its Vice President and Chief Financial Officer. Michael A. McCabe, whose intention to retire from the same position was previously announced on November 14, 2018, was appointed Vice President, effective January 7, 2019. Mr. Regan will also be appointed as Chief Financial Officer of the Company's subsidiary Alta Mesa Holdings GP, LLC (“AMH GP”), the general partner of Alta Mesa Holdings, LP (“AMH”), and Mr. McCabe will be appointed as Vice President of AMH GP.

Mr. Regan will assume the role of principal financial officer, and Mr. McCabe will step down from that role, the date after the filing of the Form 10-K for the year ending December 31, 2018 for each of the Company and AMH, or on such earlier date as the Company may request. Prior to joining the Company, Mr. Regan served as the Executive Vice President and Chief Financial Officer of Vine Oil and Gas LP. from January 2015 to June 2018.

He previously served as Chief Financial Officer of Quicksilver Resources from April 2012 through December 2014, after having served as their Chief Accounting Officer beginning in September 2007.