| 1 | 3tec Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 2 | A & A Tank Truck Company | Norman, OK 73070-8969 | Oil & Gas Operator | Mar 2025 |
| 3 | Adobe Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 4 | Adparo LLC | Oklahoma City, OK 73102-4803 | Oil & Gas Operator | Mar 2025 |
| 5 | Aexco Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 6 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 7 | Almont Energy LLC | Kingfisher, OK 73750-0901 | Oil & Gas Operator | Oct 2021 |
| 8 | Amarillo Exploration, Inc. | Dallas, TX 75360 | Oil & Gas Operator | May 2025 |
| 9 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 10 | Amax Petroleum Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2012 |
| 11 | Amerac Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2013 |
| 12 | American Natural Energy Corp | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2025 |
| 13 | American Star Energy & Mineral Corp | Amarillo, TX 79102-2283 | Oil & Gas Operator | Jun 2015 |
| 14 | American Trading & Prod Corp | Houston, TX 77040-6471 | Oil & Gas Operator | Nov 2014 |
| 15 | Amplify Oklahoma Operating LLC | Houston, TX 77002-4800 | Oil & Gas Operator | Feb 2025 |
| 16 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 17 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Mar 2025 |
| 18 | Anco Account | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 1995 |
| 19 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 20 | Anson Company | Oklahoma City, OK 73124 | Oil & Gas Operator | Apr 2018 |
| 21 | Antioch Operating LLC | Dallas, TX 75206 | Oil & Gas Operator | Mar 2025 |
| 22 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 23 | Apache Energy Resources Corp | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 24 | Apc Operating Partnership LP | Tulsa, OK 74136-4224 | Oil & Gas Operator | Jun 2015 |
| 25 | Apexco, Inc. | Sand Springs, OK 74063 | Oil & Gas Operator | Mar 2025 |
| 26 | Arbuckle Enterprises, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Feb 2025 |
| 27 | Arnold Oil Properties, L.L.C. | Nichols Hill, OK 73116 | Oil & Gas Operator | May 2025 |
| 28 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 29 | Arrington David Oil & Gas Inc | Midland, TX 79702-2071 | Oil & Gas Operator | Dec 2014 |
| 30 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | May 2025 |
| 31 | Arvine Pipe & Supply Co Inc | Norman, OK 73069-8224 | Oil & Gas Operator | Jul 2015 |
| 32 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 33 | Atchley Resources, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2025 |
| 34 | Athena Energy, Inc. | Gallatin, TN 37066 | Oil & Gas Operator | May 2025 |
| 35 | Atlantic Richfield Company | Plano, TX 75074 | Oil & Gas Operator | Dec 2016 |
| 36 | Atwell, David L. | Duncan, OK 73533 | Oil & Gas Operator | Jul 2003 |
| 37 | Austin Production Company, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Mar 2015 |
| 38 | Avalanche Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | May 2025 |
| 39 | B & W Operating, L.L.C. | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 40 | B And G Production, Inc. | Woodward, OK 73801 | Oil & Gas Operator | May 2025 |
| 41 | Barrett Resources Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 42 | Baruch-Foster Corporation | Oklahoma City, OK 73126-6770 | Oil & Gas Operator | Feb 2001 |
| 43 | Basin Operating Services LLC | Oklahoma City, OK 73106-5615 | Oil & Gas Operator | Feb 2025 |
| 44 | BC Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 45 | Bce-Mach II LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | May 2025 |
| 46 | Bce-Mach III LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | May 2025 |
| 47 | Bce-Mach LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2025 |
| 48 | Beard Oil Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2013 |
| 49 | Beck Pump & Supply Inc | Hennessey, OK 73742-0175 | Oil & Gas Operator | Nov 2019 |
| 50 | Beck Resources Incorporated | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2025 |
| 51 | Becker Oil Corporation | Ponca City, OK 74602 | Oil & Gas Operator | Feb 2025 |
| 52 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 53 | Bell & Kinley Company LLC | Piedmont, OK 73078-8918 | Oil & Gas Operator | Jul 2021 |
| 54 | Belnorth Petroleum Corporation | Midland, TX 79701 | Oil & Gas Operator | Feb 1991 |
| 55 | Beta Oil Company Inc | Oklahoma City, OK 73157-2958 | Oil & Gas Operator | Dec 2022 |
| 56 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 57 | BHP Petroleum Company Inc | Houston, TX 77057 | Oil & Gas Operator | Jun 2016 |
| 58 | Billy Matthews Production LLC | Dover, OK 73734 | Oil & Gas Operator | Feb 2025 |
| 59 | Bison Energy Corporation | Wichita, KS 67206 | Oil & Gas Operator | Mar 2022 |
| 60 | Blackjack Oil & Gas, Inc. | Hennessey, OK 73742 | Oil & Gas Operator | May 2025 |
| 61 | Blair Oil Company | Kingfisher, OK 73750-1213 | Oil & Gas Operator | Mar 2025 |
| 62 | Blake Production Company, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | May 2025 |
| 63 | Blue Dolphin Production LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2025 |
| 64 | Blue Star Energy, Inc. | Shawnee, OK 74802 | Oil & Gas Operator | May 2025 |
| 65 | Bluebonnet Oil Corporation | Oklahoma City, OK 73162-6249 | Oil & Gas Operator | Mar 2025 |
| 66 | Bluemark Energy, LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2025 |
| 67 | Bob & Son Oil Company | Hennessey, OK 73742-0578 | Oil & Gas Operator | Jul 2017 |
| 68 | Bobwhite Production Company, Inc | Tulsa, OK 74112 | Oil & Gas Operator | Feb 2025 |
| 69 | Bonita Hydrocarbons Company | Dallas, TX 75229 | Oil & Gas Operator | Jun 2008 |
| 70 | Boosted Production LLC | Mooreland, OK 73852-0076 | Oil & Gas Operator | Mar 2025 |
| 71 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 72 | Bracken Energy Company | Oklahoma City, OK 73118 | Oil & Gas Operator | Mar 2015 |
| 73 | Bracken Operating, L.L.C. | Perryton, TX 79070 | Oil & Gas Operator | May 2025 |
| 74 | Bradmar Petroleum Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 75 | Brammer Supply Inc | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2014 |
| 76 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2025 |
| 77 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 78 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 79 | BRG Petroleum LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2025 |
| 80 | BRG Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2020 |
| 81 | BRG Production Company | Tulsa, OK 74136-6338 | Oil & Gas Operator | Mar 2025 |
| 82 | Brighton Energy LLC | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2015 |
| 83 | Briscoe Oil Operating Co., Inc. | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2015 |
| 84 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 85 | Britt Oil Company LLC | Shawnee, OK 74801-9613 | Oil & Gas Operator | Mar 2025 |
| 86 | Brock Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2019 |
| 87 | Bromar Oil Company | Fairview, OK 73737-0006 | Oil & Gas Operator | Apr 2014 |
| 88 | Brower, Robert C. | Fort Worth, TX 76116 | Oil & Gas Operator | May 2025 |
| 89 | Brown & Borelli, Inc. | Kingfisher, OK 73750 | Oil & Gas Operator | May 2025 |
| 90 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 91 | Burlington Res Oil & Gas LP | Houston, TX 77079 | Oil & Gas Operator | Jan 2025 |
| 92 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 93 | Buttonwood Petroleum Inc | Tulsa, OK 74136-4234 | Oil & Gas Operator | Jan 2014 |
| 94 | BVD Inc | Yates Center, KS 66783-0194 | Oil & Gas Operator | Mar 2025 |
| 95 | C.D. Operating Company, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 96 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Feb 2025 |
| 97 | Cactus Energy Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2025 |
| 98 | Camino Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 99 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 100 | Canard Colvert Operating LLC | Dallas, TX 75219-6243 | Oil & Gas Operator | Mar 2025 |