X0206 3 2018-06-09 0 0001690769 Alta Mesa Resources, Inc. /DE AMR 0001724017 High Mesa Holdings, LP 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 183143924 I See Footnote Class C Common Stock 2018-08-08 Class A Common Stock 938154 I Through KFM Holdco, LLC (a) 136,665,750 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) 46,478,174 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"). (a) 509,386 common units of SRII Opco, LP and an equal number of shares of Class C Common Stock of the Company, which are convertible, as a unit, into an equal number of shares of Class A Common Stock of the Company and (b) 428,786 Earn-Out Shares, in each case, held by KFM Holdco, LLC. 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