| 1 | 3-T Exploration, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 2 | Akins Oil Company | Wichita Falls, TX 76302 | Oil & Gas Operator | May 2025 |
| 3 | Alpha Exploration Co. | Wichita Falls, TX 76309 | Oil & Gas Operator | Oct 1998 |
| 4 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 5 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | May 2025 |
| 6 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 7 | Antle Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 8 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 9 | Arcooil Corp | San Antonio, TX 78205 | Oil & Gas Operator | May 2025 |
| 10 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 11 | Aries Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2010 |
| 12 | Armor Petroleum, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 13 | Arrington,David H. Oil & Gas,Inc | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 14 | Ashtola Exploration Company,Inc. | Amarillo, TX 79105 | Oil & Gas Operator | May 2025 |
| 15 | Assent Energy Partners, LLC | College Sta, TX 77840 | Oil & Gas Operator | May 2025 |
| 16 | B And G Production, Inc. | Woodward, OK 73801 | Oil & Gas Operator | May 2025 |
| 17 | Baltic Royalty Corp. | Dallas, TX 75209 | Oil & Gas Operator | Mar 2008 |
| 18 | Barnhart Co. | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 19 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 20 | Benco Energy Inc | Tionesta, PA 16353-5851 | Oil & Gas Operator | Dec 2002 |
| 21 | Bennett Resources, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 22 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 23 | Birge Oil Co. | Wichita Falls, TX 76302 | Oil & Gas Operator | Jun 1995 |
| 24 | BMBD Enterprises, LLC | Iowa Park, TX 76367 | Oil & Gas Operator | May 2025 |
| 25 | Bonfire Operating LLC | Cresson, TX 76035 | Oil & Gas Operator | May 2025 |
| 26 | Borders, Delbert L. Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2019 |
| 27 | Braman, D. H., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Dec 2008 |
| 28 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 29 | Bridger Oil Inc. | Richmond, TX 77406 | Oil & Gas Operator | May 2025 |
| 30 | Bridwell Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 31 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 32 | Brooks, E. B., Jr. | Dallas, TX 75206 | Oil & Gas Operator | May 2018 |
| 33 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | May 2025 |
| 34 | Burk Royalty Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2002 |
| 35 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 36 | Burns, P. C. Oil Producers Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2000 |
| 37 | Cag Petroleum Corp. | Dallas, TX 75382 | Oil & Gas Operator | May 2025 |
| 38 | Cambridge Production, Inc. | Amarillo, TX 79120 | Oil & Gas Operator | Nov 2020 |
| 39 | Canyon Ridge Energy LLC | Iowa Park, TX 76367 | Oil Operator | Nov 2024 |
| 40 | Cet Energy Corporation | Spring, TX 77391 | Oil & Gas Operator | Nov 2003 |
| 41 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 42 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2025 |
| 43 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2025 |
| 44 | Chestnut Explor. And Prod., Inc. | Dallas, TX 75208 | Oil & Gas Operator | May 2025 |
| 45 | Chestnut Petroleum, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Nov 2011 |
| 46 | Chi Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 47 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 48 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 49 | Clear Fork, Incorporated | Abilene, TX 79604 | Oil & Gas Operator | May 2025 |
| 50 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 51 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 52 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 53 | Corda Corporation | Wichita Falls, TX 76302 | Oil & Gas Operator | May 2025 |
| 54 | Crawford Energy Operating Co | Houston, TX 77056 | Oil & Gas Operator | Aug 2008 |
| 55 | Crawford Energy, Incorporated | Houston, TX 77056 | Oil & Gas Operator | Mar 2008 |
| 56 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 57 | Crutcher Oil Properties | Wichita Falls, TX 76301 | Oil & Gas Operator | May 2025 |
| 58 | Cwic, Inc. | Granbury, TX 76049 | Oil & Gas Operator | May 2025 |
| 59 | Dallas Petroleum Group, LLC | Dallas, TX 75379 | Oil & Gas Operator | May 2025 |
| 60 | DDD Exploration Inc | Amarillo, TX 79109 | Oil Operator | May 2025 |
| 61 | Decleva, Paul | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2020 |
| 62 | Delek Energy Systems Us Inc | Denver, CO 80202 | Oil & Gas Operator | Oct 2011 |
| 63 | Delfin Operating, LLC | Dallas, TX 75243 | Oil & Gas Operator | May 2025 |
| 64 | Dimock Operating Company | Frisco, TX 75034 | Oil & Gas Operator | May 2025 |
| 65 | Dry Fork Production Co | Wichita Falls, TX 76301 | Oil Operator | Apr 2003 |
| 66 | Dry Fork Production Co., LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 67 | Durham, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2016 |
| 68 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 69 | Eagle Energy Acquisitions LP | Houston, TX 77002 | Oil & Gas Operator | Aug 2014 |
| 70 | Eagle Hydrocarbons (Texas) Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 71 | Eagle Hydrocarbons Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 2020 |
| 72 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | May 2025 |
| 73 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 74 | Eldorado Oil And Gas, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Nov 1995 |
| 75 | En Geo, Inc. | Richardson, TX 75081 | Oil & Gas Operator | May 2025 |
| 76 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 77 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 78 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 79 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 80 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 81 | Enserch Oil & Gas, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 1998 |
| 82 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 83 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 84 | Esperanza Energy Corp. | Prosper, TX 75078 | Oil & Gas Operator | Mar 2015 |
| 85 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Feb 2025 |
| 86 | Exmoor Oil & Minerals Corp. | Dallas, TX 75225 | Oil & Gas Operator | May 1994 |
| 87 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | May 2025 |
| 88 | Falcon Oil & Gas Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 2022 |
| 89 | Farrell Oil Company | Lubbock, TX 79424 | Oil & Gas Operator | May 2025 |
| 90 | Farrex, Inc. | Vernon, TX 76384 | Oil & Gas Operator | Oct 2008 |
| 91 | Fergus Oil & Gas, LLC | Allen, TX 75013 | Oil Operator | May 2025 |
| 92 | Ferguson, S. M. Jr., Inc. | Dallas, TX 75218 | Oil & Gas Operator | May 2025 |
| 93 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 94 | Finnell Oil Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2009 |
| 95 | Foree Oil Company | Terrell, TX 75160 | Oil & Gas Operator | May 2025 |
| 96 | Foree, R. L. Trust "A" | Dallas, TX 75225 | Oil & Gas Operator | Dec 1999 |
| 97 | Forest Oil Permian Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 98 | Fortson Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2020 |
| 99 | Gaedeke Oil & Gas Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Sep 2023 |
| 100 | Geonatural Resources, Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |