| 1 | 2 T Production | Bowie, TX 76230 | Oil & Gas Operator | Oct 2025 |
| 2 | 3-R Production, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Oct 2025 |
| 3 | 3HP, Inc. | Brownwood, TX 76804 | Oil & Gas Operator | May 2016 |
| 4 | Aber Oil & Gas Co. | Tyler, TX 75702 | Oil & Gas Operator | Nov 2013 |
| 5 | Ableready, Inc. | Houston, TX 77269 | Oil & Gas Operator | Oct 2025 |
| 6 | Adami Compressor Service | Weatherford, TX 76086 | Gas Operator | Oct 2025 |
| 7 | Adexco Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 8 | Adkins, R. L. Corp. | Lubbock, TX 79408 | Oil & Gas Operator | Jun 2013 |
| 9 | Aeternum Energy, LLC | Nederland, TX 77627 | Oil & Gas Operator | Oct 2025 |
| 10 | Alaron Energy, Inc. | Irving, TX 75038 | Oil & Gas Operator | Oct 2025 |
| 11 | Albert, David Oil & Gas | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 12 | Alleder Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 13 | Allison/Hobbs Inc. | Alba, TX 75410 | Oil & Gas Operator | Oct 2025 |
| 14 | Altex Resources, Inc. | Carney, OK 74832 | Oil & Gas Operator | Mar 2015 |
| 15 | Amen Oil LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 16 | American Star Energy & Min. Corp | Katy, TX 77449 | Oil & Gas Operator | Oct 2025 |
| 17 | American West Resources, Inc | Fort Worth, TX 76161 | Oil & Gas Operator | Oct 2025 |
| 18 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jul 2025 |
| 19 | Antero Resources I, LP | Denver, CO 80202 | Oil & Gas Operator | Jun 2005 |
| 20 | Antle Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 21 | Arcadia Expl. & Prod. Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2011 |
| 22 | Arco Oil & Gas Co.-Silsbee | Lafayette, LA 70505 | Oil & Gas Operator | Jul 1993 |
| 23 | Arledge & Young, Inc. | Weatherford, TX 76086 | Oil & Gas Operator | Feb 1999 |
| 24 | Arrington Oil&Gas Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 25 | Arrington,David H. Oil & Gas,Inc | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 26 | Arrowhead Productions, LP | Fort Worth, TX 76109 | Oil & Gas Operator | Oct 2025 |
| 27 | Aruba Petroleum, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Jun 2025 |
| 28 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 29 | Athena Resources, Inc. | Dallas, TX 75248 | Oil & Gas Operator | Oct 2025 |
| 30 | Atlas Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 31 | Atoka Energy LLC | Gainesville, TX 76241 | Oil & Gas Operator | Oct 2025 |
| 32 | Atoka Operating, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Oct 2025 |
| 33 | Ausanka Oil Operations | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1995 |
| 34 | Austex Energy, Inc. | Granbury, TX 76048 | Oil & Gas Operator | Apr 1993 |
| 35 | Austin Energy Operations, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Oct 2025 |
| 36 | Baja Production | Bridgeport, TX 76426 | Oil & Gas Operator | Oct 2025 |
| 37 | Banks, R. C. | Midland, TX 79702 | Oil & Gas Operator | Apr 2016 |
| 38 | Barnett Energy, Inc. | The Colony, TX 75056 | Oil & Gas Operator | Oct 2025 |
| 39 | Barnett Oil Investments, Inc. | Hobbs, NM 88240 | Oil & Gas Operator | Mar 1999 |
| 40 | Basal Corporation | Cleburne, TX 76033 | Oil & Gas Operator | Oct 2025 |
| 41 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | Oct 2025 |
| 42 | Bedrock Production, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 43 | Bell, O. M. | Merkel, TX 79536 | Oil & Gas Operator | Mar 2008 |
| 44 | Best Petroleum Explorations,Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Oct 2025 |
| 45 | Big Star Exploration | Fort Worth, TX 76121 | Oil & Gas Operator | Oct 2025 |
| 46 | Bivins, Orville J. Jr. | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2004 |
| 47 | BKV Barnett, LLC | Fort Worth, TX 76106 | Oil & Gas Operator | Oct 2025 |
| 48 | BKV North Texas, LLC | Fort Worth, TX 76106 | Oil & Gas Operator | Oct 2025 |
| 49 | Black Dome Energy Corporation | Golden, CO 80401 | Oil & Gas Operator | Dec 2019 |
| 50 | Black Resources, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Mar 2008 |
| 51 | Blackbeard Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Oct 2025 |
| 52 | Bluestone Natural Res. II, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2019 |
| 53 | Bomar Oil & Gas, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Dec 2020 |
| 54 | Bonfire Operating LLC | Cresson, TX 76035 | Oil & Gas Operator | Oct 2025 |
| 55 | Borderline Operating Corp. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 56 | Bowerman Exploration, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2009 |
| 57 | Bowerman Investments Inc. | Arlington, TX 76003 | Oil & Gas Operator | Oct 2025 |
| 58 | Brammer Petroleum, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Oct 2025 |
| 59 | Brazos Operating LLC | Midland, TX 79710 | Gas Operator | Oct 2025 |
| 60 | BRG Lone Star LTD. | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2025 |
| 61 | Briar Energy Corporation | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 62 | Brigadier Operating, LLC | Plano, TX 75024 | Oil & Gas Operator | Aug 2017 |
| 63 | Briley Operating, LLC | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 64 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 65 | Brooks, E. B., Jr. | Dallas, TX 75206 | Oil & Gas Operator | May 2018 |
| 66 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 67 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 68 | Cal-Tex Fossil, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 69 | Canyon Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 70 | Carlton, Wayne Inc. | Bronte, TX 76933 | Oil & Gas Operator | Dec 2002 |
| 71 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 72 | Carter Energy Corporation | Duncanville, TX 75138 | Oil & Gas Operator | Sep 2010 |
| 73 | Case Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 74 | Cbmoncrief Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 75 | CD Consulting & Operating Co. | Bridgeport, TX 76426 | Oil & Gas Operator | Oct 2025 |
| 76 | Centaur Petroleum Corporation | Fort Worth, TX 76101 | Oil & Gas Operator | Oct 2025 |
| 77 | Century Petroleum, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Oct 2025 |
| 78 | Certified Petroleum Inc. | Mineral Wells, TX 76067 | Oil & Gas Operator | May 2006 |
| 79 | Chapparal Operating Co. | Fort Worth, TX 76121 | Oil & Gas Operator | Oct 2025 |
| 80 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Oct 2025 |
| 81 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 82 | Chief Oil & Gas LLC | Dallas, TX 75225 | Oil & Gas Operator | Feb 2022 |
| 83 | Chief Operating LLC | Dallas, TX 75225 | Gas Operator | Mar 2009 |
| 84 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 85 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Oct 2025 |
| 86 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 87 | Clearfork Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2011 |
| 88 | Clearfork Production, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2018 |
| 89 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2025 |
| 90 | Cole, Frank W Engineering | Dallas, TX 75254 | Oil & Gas Operator | Mar 2006 |
| 91 | Concord Energy, Inc. | Glen Rose, TX 76043 | Oil & Gas Operator | Oct 2025 |
| 92 | Concord Operating Incorporated | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2008 |
| 93 | Cooper Oil & Gas, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2010 |
| 94 | Cooper Oil & Gas, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Oct 2025 |
| 95 | Cottonwood Petroleum Co. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2009 |
| 96 | Cox, Lee Investments Inc. | Mineral Wells, TX 76067 | Oil & Gas Operator | Oct 2025 |
| 97 | Crossbow Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 98 | Crown Equipment Co. | Weatherford, TX 76086 | Oil & Gas Operator | Oct 2025 |
| 99 | Cumberland Petroleum, Inc. II | Weatherford, TX 76086 | Oil & Gas Operator | May 1997 |
| 100 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | Oct 2025 |