| 12001 | W. B. D. Oil & Gas Company | Pampa, TX 79066 | Oil & Gas Operator | Dec 1995 |
| 12002 | W. E. B. Well Tending Service, Inc. | Vienna, WV 26105 | Oil & Gas Operator | Nov 2011 |
| 12003 | W. R. G. Oil & Gas, Inc. | Arlington, TX 76013 | Oil & Gas Operator | Dec 1993 |
| 12004 | W. R. Williams, Inc. | Amarillo, TX 79105 | Gas Operator | Dec 2019 |
| 12005 | W. T. Boyle & Co. | Graham, TX 76450 | Oil Operator | Mar 2008 |
| 12006 | W.A. Oil Co. | Andrews, TX 79714 | Oil & Gas Operator | Aug 1997 |
| 12007 | W.B.D. Oil And Gas Inc. | Pampa, TX 79066 | Oil & Gas Operator | Oct 2019 |
| 12008 | W.D. Oil Company | Pampa, TX 79066 | Oil & Gas Operator | Oct 2001 |
| 12009 | W.E.S. Operating Company, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Nov 2011 |
| 12010 | W.H.D., Inc. | Euless, TX 76039 | Oil & Gas Operator | Aug 1998 |
| 12011 | W.I. Royalty, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Nov 2009 |
| 12012 | W.L. Ranch Inc. | Caldwell, TX 77836 | Oil & Gas Operator | Dec 2025 |
| 12013 | W.O.G., Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 12014 | W.P.P.I. Inc. | Westbrook, TX 79565 | Oil & Gas Operator | Jul 2013 |
| 12015 | W.R. Guffey LLC | Dallas, TX 75206 | Oil & Gas Operator | Jul 2020 |
| 12016 | W.T. Waggoner Estate, Inc. | Vernon, TX 76385 | Oil Operator | Dec 2025 |
| 12017 | W.W. Energy | Luling, TX 78648 | Oil & Gas Operator | Dec 2025 |
| 12018 | W.W.R. Holding, LLC | Coleman, TX 76834 | Oil & Gas Operator | Mar 2008 |
| 12019 | Wacker Oil Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 12020 | Waco Petro, LP | Sulphur SPGS, TX 75483 | Oil Operator | Sep 2015 |
| 12021 | Waco Production Co. | Archer City, TX 76351 | Oil & Gas Operator | Sep 1993 |
| 12022 | Waddell, Kent | Abilene, TX 79606 | Oil & Gas Operator | Nov 2010 |
| 12023 | Wade Operating | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 12024 | Wade, Jim | Olney, TX 76374 | Oil & Gas Operator | Dec 2025 |
| 12025 | Wadi Exploration&Production,LLC | San Clemente, CA 92672 | Oil & Gas Operator | Jul 2020 |
| 12026 | Wadi Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Dec 2025 |
| 12027 | Wadi Petroleum Inc | Houston, TX 77014 | Oil & Gas Operator | May 2018 |
| 12028 | Waelder Oil & Gas, Inc. | Fort Smith, AR 72903 | Oil & Gas Operator | Oct 2025 |
| 12029 | Waggner, Fred | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 12030 | Waggner, Robert | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2006 |
| 12031 | Waggoner Operating, L.L.C. | Vernon, TX 76385 | Oil Operator | Dec 2025 |
| 12032 | Waggoner, John S. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2017 |
| 12033 | Waggoner, Ralph E. | Windthorst, TX 76389 | Oil & Gas Operator | Dec 2010 |
| 12034 | Waggoner, W. T., Estate | Vernon, TX 76385 | Oil & Gas Operator | Feb 2018 |
| 12035 | Waggoner-Baldridge Oper. Co, Inc | Dallas, TX 75206 | Oil & Gas Operator | Jan 1998 |
| 12036 | Wagman Petroleum, Inc. | Dallas, TX 75202 | Oil & Gas Operator | Dec 2025 |
| 12037 | Wagman, Brent A. | Dallas, TX 75202 | Oil & Gas Operator | Dec 2025 |
| 12038 | Wagner & Brown, LTD. | Midland, TX 79702 | Oil & Gas Operator | Aug 2014 |
| 12039 | Wagner Energy LLC | Enid, OK 73701 | Oil Operator | Oct 2025 |
| 12040 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 12041 | Wagner, Duer & Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1999 |
| 12042 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 12043 | Wako Oil Co. LLC | Graham, TX 76450 | Oil Operator | Dec 2025 |
| 12044 | Walbet | Monahans, TX 79756 | Oil & Gas Operator | Dec 1993 |
| 12045 | Walbet, Inc. | Monahans, TX 79756 | Oil & Gas Operator | Dec 2025 |
| 12046 | Waldrop, L. E. | Houston, TX 77024 | Oil & Gas Operator | Jun 1996 |
| 12047 | Walkabout Operating, LLC | Lubbock, TX 79424 | Oil & Gas Operator | Dec 2025 |
| 12048 | Walker Oil & Gas | Early, TX 76802 | Oil & Gas Operator | Dec 2002 |
| 12049 | Walker Oil And Gas LTD | Snyder, TX 79550 | Oil Operator | Dec 2025 |
| 12050 | Walker Operating (I) | Wichita Falls, TX 76308 | Oil Operator | Dec 2025 |
| 12051 | Walker'S Well Service | Gladewater, TX 75647 | Oil & Gas Operator | Aug 2003 |
| 12052 | Walker, Daniel J. | La Vernia, TX 78121 | Oil Operator | Dec 2025 |
| 12053 | Walker, Harrel L. | La Vernia, TX 78121 | Oil & Gas Operator | May 2023 |
| 12054 | Walker, Kent | Midland, TX 79704 | Oil & Gas Operator | Jun 2004 |
| 12055 | Walker, Tigner | Shreveport, LA 71138 | Oil & Gas Operator | Feb 2005 |
| 12056 | Walking X Oil Co. | Whiteface, TX 79379 | Oil & Gas Operator | Dec 2025 |
| 12057 | Wallace Oil & Gas Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Dec 2025 |
| 12058 | Wallace Operating Company LLC | Metairie, LA 70003 | Gas Operator | Dec 2025 |
| 12059 | Wallen Production Co. | Midland, TX 79702 | Oil & Gas Operator | Aug 1996 |
| 12060 | Waller, C.W. Oil Co. | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 12061 | Wallis Energy, Inc. | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 12062 | Walls Energy, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Aug 2003 |
| 12063 | Walls, G. M. & Frances, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 12064 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | Dec 2025 |
| 12065 | Walsh Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2022 |
| 12066 | Walsh Resources, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Dec 2025 |
| 12067 | Walsh, F H Jr. Operating Co. Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2019 |
| 12068 | Walsh, F. Howard, Jr. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 1994 |
| 12069 | Walter Exploration Company | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 12070 | Walter Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | May 2009 |
| 12071 | Walter H. Husfeld Oil Co LLC | Bowie, TX 76230 | Oil & Gas Operator | Dec 2025 |
| 12072 | Walter Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 12073 | Walterscheid, A. D. | Muenster, TX 76252 | Oil & Gas Operator | Dec 2014 |
| 12074 | Walterscheid, R. F. | Muenster, TX 76252 | Oil & Gas Operator | Oct 1993 |
| 12075 | Walton Producing Company | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2005 |
| 12076 | Walton Producing Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 12077 | Walton Properties LTD. | Midland, TX 79702 | Oil & Gas Operator | Feb 2004 |
| 12078 | Walton, James A. | Midland, TX 79702 | Oil & Gas Operator | Oct 1994 |
| 12079 | Walton, W. W. | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 1994 |
| 12080 | Wam Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Dec 2016 |
| 12081 | Wandoo Energy, LLC | The Woodlands, TX 77382 | Oil & Gas Operator | Dec 2025 |
| 12082 | Wapiti Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Jul 2006 |
| 12083 | Wapiti Operating, LLC | Houston, TX 77043 | Oil & Gas Operator | Dec 2025 |
| 12084 | Warbonnet Exploration Company | Houston, TX 77056 | Oil & Gas Operator | Apr 2016 |
| 12085 | Ward Oil Co. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 12086 | Ward Trust | Spring, TX 77383 | Oil & Gas Operator | May 2013 |
| 12087 | Ward, Charles Oil Company | Olney, TX 76374 | Oil Operator | Dec 2025 |
| 12088 | Ward, E. B. | Alice, TX 78333 | Oil & Gas Operator | Jun 2001 |
| 12089 | Ward, L. S. | Graham, TX 76450 | Oil & Gas Operator | Jun 2001 |
| 12090 | Ward, Ted G. Jr. | Monahans, TX 79756 | Oil & Gas Operator | Nov 2000 |
| 12091 | Warner Oil Co., Inc. | Canyon, TX 79015 | Oil & Gas Operator | May 2013 |
| 12092 | Warner Sisters, LLC | Thompsons Sta, TN 37179 | Oil Operator | Dec 2025 |
| 12093 | Warner, Mark T. Oil Co | Pampa, TX 79065 | Oil & Gas Operator | Jul 2021 |
| 12094 | Warner-Pawel | Alice, TX 78333 | Oil & Gas Operator | Dec 2025 |
| 12095 | Warnock Operating Company, LLC | Graham, TX 76450 | Oil & Gas Operator | Jul 2013 |
| 12096 | Warren American Oil Co | Tulsa, OK 74147 | Oil & Gas Operator | Nov 2025 |
| 12097 | Warren American Oil Company LLC | Tulsa, OK 74147 | Oil & Gas Operator | Dec 2025 |
| 12098 | Warren Producers Inc | Bowling Green, KY 42102 | Oil & Gas Operator | Dec 2017 |
| 12099 | Warren Production Services | Caldwell, TX 77836 | Oil & Gas Operator | Dec 2025 |
| 12100 | Warren, Earl T. | San Angelo, TX 76906 | Oil & Gas Operator | Dec 2025 |