X0206 3 2018-06-09 0 0001690769 Alta Mesa Resources, Inc. /DE AMR 0001724020 High Mesa Holdings GP, LLC 15021 KATY FREEWAY, SUITE 400 HOUSTON TX 77094 0 0 1 0 Class A Common Stock 0 D Class C Common Stock 2018-08-08 Class A Common Stock 184082096 I Through High Mesa Holdings, LP (a) 137,175,136 common units of SRII Opco, LP and an equal number of shares of Class C Common Stock of Alta Mesa Resources, Inc. (the "Company"), which are convertible, as a unit, into an equal number of shares of Class A Common Stock of the Company and (b) 46,906,960 common units of SRII Opco, LP and an equal number of shares of Class C Common Stock of the Company that are issuable if the Class A Common Stock trades above certain thresholds (the "Earn-Out Shares"), in each case beneficially owned by High Mesa Holdings, LP, of which High Mesa Holdings GP, LLC is the sole general partner. The reporting person disclaims beneficial ownership in these securities, and this report shall not be deemed an admission tht the reporting person is the beneficial owner of the securities for purposes of Section 16 or any other purpose. The common units in SRII Opco, LP, shares of Class C Common Stock and Earn-Out Shares referenced in this filing were all issued pursuant to a business combination that closed on February 9, 2018 whereby the Company acquired all of the outstanding equity of Alta Mesa Holdings, LP from High Mesa Holdings, LP and another person, and all of the outstanding equity of Kingfisher Midstream, LLC from KFM Holdco, LLC. The common units of SRII Opco, LP and the corresponding shares of Class C Common Stock of the Company issued in exchange for the equity of Alta Mesa Holdings, LP may not be converted into shares of Class A Common Stock until August 8, 2018. Common units of SRII Opco, LP and an equal number of shares of Class C Common Stock of the Company are convertible, as a unit, into an equal number of shares of Class A Common Stock of the Company, and have no expiration date. Exhibit 24: Power of Attorney /s/ Kimberly O. Warnica-Attorney-in-Fact 2018-06-12