OWNER RELATIONS INQUIRIES For questions related to current Oklahoma royalty payments, suspense funds, or joint interest, please contact BCE-Mach III: http://machresources.com/owner-relations/ 405.252.8197. For questions related to 2019 and prior royalty payments and joint interest bills or 2020 payments/1099s from Alta Mesa, please contact Alta Mesa Services: revenue@altamesa.net 855.450.3973 ext 102 ALL OTHER INQUIRIES Please see company groups below: Alta Mesa Resources, Inc SR II Op Co, LP Mailing address: c/o AlixPartners 2101 Cedar Spring Road Suite 1100 Dallas, TX 75201 Phone: 214.647.7630 Alta Mesa Holdings, LP Alta Mesa Services, LP Oklahoma Energy Acquisitions, LP Alta Mesa Holdings GP, LLC OEM GP, LLC Alta Mesa Finance Services Corp. Mailing address: Attn: Michael Tribolet 2450 Louisiana St. #400-164 Houston, TX 77006 Phone: 855.450.3973 ext 102 Kingfisher Midstream, LLC Oklahoma Produced Water Solutions Mailing address: c/o AlixPartners 2101 Cedar Spring Road Suite 1100 Dallas, TX 75201 Phone: 214.647.7630 Inquiries related to High Mesa entities (see below for full list of legal entities): Mailing address: c/o Jones Murray & Beatty LLP 4119 Montrose Suite 230 Houston, TX 77006 High Mesa Entities High Mesa Holdings GP LLC High Mesa Holdings, LP High Mesa Services, LLC Alabama Energy Resources LLC Alta Mesa Drilling, LLC Alta Mesa Energy LLC AM Idaho LLC AM Michigan LLC AMH Energy New Mexico, LLC Aransas Resources, L.P ARI Development, LLC Brayton Management GP II, LLC Brayton Management GP, LLC Brayton Resources II, LP Brayton Resources, LP Buckeye Production Company, LP Cairn Energy USA, LLC Galveston Bay Resources Holdings, LP Leads Resources, LLC Louisiana Exploration & Acquisitions, LP Louisiana Onshore Properties, LLC Navasota Resources Ltd., LLP Nueces Resources, LP Orion Drilling Company LLC Orion Operating Company, LP Petro Acquisitions, LP Petro Operating Company, LP TE TMR, LLC TEA Energy Services LLC Texas Energy Acquisitions, LP The Meridian Production, LLC The Meridian Resource & Exploration, LLC TMR Drilling, LLC Virginia Oil and Gas, LLC Copyright © 2020 Alta Mesa Resources • | Site Designed by EnerCom

OWNERS LOGIN For questions related to current Oklahoma royalty payments, suspense funds, or joint interest, please contact BCE-Mach III: http://machresources.com/owner-relations/ 405.252.8197. For questions related to 2019 and prior royalty payments and joint interest bills or 2020 payments/1099s from Alta Mesa, please contact Alta Mesa Services: revenue@altamesa.net 855.450.3973 ext 102 Copyright © 2020 Alta Mesa Resources • | Site Designed by EnerCom