| 12001 | Western Gulf Oil & Gas Inc. | Dallas, TX 75360 | Oil & Gas Operator | Jul 2000 |
| 12002 | Western Gulf Oil & Gas, LLC | Bishop, TX 78343 | Oil & Gas Operator | Sep 2026 |
| 12003 | Western Natural Gas Company | Shelby, MT 59474 | Oil & Gas Operator | May 2026 |
| 12004 | Western Oil Company | Midland, TX 79702 | Oil & Gas Operator | Jul 2014 |
| 12005 | Western Oil Producers Inc | Roswell, NM 88202 | Oil & Gas Operator | Jul 2005 |
| 12006 | Western Petroleum Company Inc | Tulsa, OK 74170-2676 | Oil & Gas Operator | Apr 2020 |
| 12007 | Western Petroleum Resources, Inc | Dallas, TX 75219 | Oil & Gas Operator | May 2021 |
| 12008 | Western Plains Resources LLC | Garden City, KS 67846 | Oil & Gas Operator | Apr 2026 |
| 12009 | Western Pride Resources, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Jan 2011 |
| 12010 | Western Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2026 |
| 12011 | Western Reserves Corporation | Abilene, TX 79608 | Oil & Gas Operator | Jan 2008 |
| 12012 | Western Reserves Oil Co Inc | Midland, TX 79705 | Oil & Gas Operator | Oct 2020 |
| 12013 | Western Sky Oil & Gas | Abilene, TX 79604 | Oil & Gas Operator | Aug 2003 |
| 12014 | Westgate Petroleum, Inc. | Fritch, TX 79036 | Oil & Gas Operator | Nov 2001 |
| 12015 | Westhall Associates, Inc. | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Aug 1997 |
| 12016 | Westico Energy Co. | Abilene, TX 79605 | Oil & Gas Operator | Nov 2004 |
| 12017 | Westlake Energy Consultants Corp | Thousand Oaks, CA 91362 | Oil & Gas Operator | Aug 2003 |
| 12018 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 12019 | Westlands Resources Corporation | Monrovia, CA 91016 | Oil & Gas Operator | Sep 2026 |
| 12020 | Westoil LLC | Austin, TX 78747 | Oil & Gas Operator | Sep 2026 |
| 12021 | Westover Production Co., LLC | Kermit, TX 79745 | Oil & Gas Operator | Sep 2026 |
| 12022 | Westpark Petroleum, Inc. | Austin, TX 78755 | Oil & Gas Operator | Sep 2026 |
| 12023 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 12024 | Westport Oil And Gas Company Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2002 |
| 12025 | Westridge Oil & Gas Properties | Mineral Wells, TX 76068 | Oil & Gas Operator | Sep 2026 |
| 12026 | Westside Energy Op. Co., LP | Oklahoma City, OK 73142 | Oil & Gas Operator | Jun 2008 |
| 12027 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Jun 2026 |
| 12028 | Weststar Operating Company | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2015 |
| 12029 | Westwin Energy I, LP | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 12030 | Westwood Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | May 2013 |
| 12031 | Wetwick DRLG. & Prod. | Carlsbad, TX 76934 | Oil Operator | Sep 2026 |
| 12032 | Wetzel Oil Company | Austin, TX 78738 | Oil & Gas Operator | May 2007 |
| 12033 | Weyerhaeuser Company | Crossett, AR 71635 | Oil & Gas Operator | Sep 1994 |
| 12034 | WF Company, LTD. | Midland, TX 79705 | Oil & Gas Operator | Oct 1995 |
| 12035 | WFMMS, Inc. | Batson, TX 77519 | Oil & Gas Operator | Sep 2026 |
| 12036 | WFW Production Company, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Sep 2026 |
| 12037 | WG Oil, LLC | Wichita Falls, TX 76308 | Oil Operator | Sep 2026 |
| 12038 | WG Operating, Inc. | Tulsa, OK 74153 | Oil & Gas Operator | May 2012 |
| 12039 | WGR, Inc. | Houston, TX 77046 | Gas Operator | Jul 2007 |
| 12040 | Wharton Oil Co. | Vernon, TX 76384 | Oil & Gas Operator | Dec 2000 |
| 12041 | Whatley, O. B. | Kilgore, TX 75662 | Oil & Gas Operator | Jun 1993 |
| 12042 | Whatley, O.B. Oil Company, Inc. | Bivins, TX 75555 | Oil & Gas Operator | Sep 2026 |
| 12043 | Wheat, Buck Resources, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Dec 2009 |
| 12044 | Wheeler Energy Co. | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2026 |
| 12045 | Wheeler Energy, LLC | Tulsa, OK 74101 | Oil & Gas Operator | Sep 2026 |
| 12046 | Wheeler Oil Co. (A) | Amarillo, TX 79114 | Gas Operator | Apr 2001 |
| 12047 | Wheeler Oil Company | Sperry, OK 74073-9417 | Oil & Gas Operator | Apr 2026 |
| 12048 | Wheeler Operating Corporation | Fort Worth, TX 76109 | Oil & Gas Operator | Sep 2026 |
| 12049 | Whelan Brothers, Inc. | Oil City, LA 71061 | Oil & Gas Operator | May 2015 |
| 12050 | Whiskey River Oil & Gas LLC | Dallas, TX 75230 | Oil & Gas Operator | Apr 2024 |
| 12051 | Whitaker Properties, L. P. | Carthage, TX 75633 | Oil & Gas Operator | Sep 1997 |
| 12052 | Whitaker, Jerry | Sunset, TX 76270 | Oil & Gas Operator | May 2022 |
| 12053 | White Creek Energy | Three Rivers, TX 78071 | Oil & Gas Operator | Sep 2026 |
| 12054 | White Knight Production LLC | Lafayette, LA 70505 | Oil & Gas Operator | Feb 2024 |
| 12055 | White Marlin Operating Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 12056 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Sep 2026 |
| 12057 | White Oak Production Company | Conway, AR 72034 | Oil & Gas Operator | Sep 2005 |
| 12058 | White Operating Company | Oklahoma City, OK 73159-7136 | Oil & Gas Operator | Jun 2026 |
| 12059 | White Pine Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 12060 | White River Operating LLC | Gilmer, TX 75644 | Oil & Gas Operator | May 2026 |
| 12061 | White Rock Exploration, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jul 2021 |
| 12062 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Sep 2026 |
| 12063 | White Sail Resources LLC | Austin, TX 78731 | Oil Operator | Sep 2026 |
| 12064 | White Sands TX LLC | Costa Mesa, CA 92626 | Oil Operator | Sep 2026 |
| 12065 | White Stride LLC | Piedmont, OK 73078 | Oil & Gas Operator | Sep 2026 |
| 12066 | White Wing Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2012 |
| 12067 | White'S Industrial Engine'S | Houston, TX 77070 | Oil & Gas Operator | Sep 2026 |
| 12068 | White, Cecil | Monahans, TX 79756 | Oil & Gas Operator | Mar 2017 |
| 12069 | White, E. C. Oil Co. | Whiteface, TX 79379 | Oil & Gas Operator | Nov 2012 |
| 12070 | White, Frank | Abilene, TX 79604 | Oil & Gas Operator | Sep 2026 |
| 12071 | White, Jack Operating | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 2026 |
| 12072 | White, Oscar | Tuscola, TX 79562 | Oil & Gas Operator | Sep 2026 |
| 12073 | White, Ralph H. | Midland, TX 79701 | Oil & Gas Operator | Oct 2002 |
| 12074 | Whitehall Operating Inc. | Houston, TX 77040 | Oil & Gas Operator | Nov 1994 |
| 12075 | Whitehawk Production Company | Midland, TX 79710 | Oil & Gas Operator | Sep 2026 |
| 12076 | Whitehead Prod. Co., Inc. | Humble, TX 77338 | Oil & Gas Operator | May 2026 |
| 12077 | Whitehead Resources, LTD. | Buna, TX 77612 | Oil & Gas Operator | Sep 2026 |
| 12078 | Whiteman Industries Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | May 2025 |
| 12079 | Whitemound Oil Company | FT Stockton, TX 79735 | Oil & Gas Operator | Jan 2017 |
| 12080 | Whitesands Operating, L.L.C. | Corpus Chrsti, TX 78466 | Oil & Gas Operator | Mar 2025 |
| 12081 | Whitesands Resources, L.L.C. | Corpus Chrsti, TX 78466 | Oil Operator | Jun 2019 |
| 12082 | Whiteside, H. W. | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 12083 | Whiteside, Robert | Comanche, TX 76442 | Oil & Gas Operator | May 1998 |
| 12084 | Whitfield Energy | Midland, TX 79702 | Oil & Gas Operator | Jan 1999 |
| 12085 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 12086 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 12087 | Whitlock, J.R. Operator | Amarillo, TX 79105 | Gas Operator | Jul 1997 |
| 12088 | Whitman-Dome Energy Corporation | San Diego, CA 92101 | Oil & Gas Operator | Nov 1996 |
| 12089 | Whitmar Exploration Company | Denver, CO 80202 | Oil & Gas Operator | Apr 2026 |
| 12090 | Whitson, James A., Jr. | Houston, TX 77063 | Oil & Gas Operator | Nov 2011 |
| 12091 | Whitt Investments, Inc. | Graham, TX 76450 | Oil Operator | Dec 2019 |
| 12092 | Whitt Oil & Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | Sep 2026 |
| 12093 | Whitt, W. J. | Albany, TX 76430 | Oil & Gas Operator | Nov 1996 |
| 12094 | Whitten Energy Corp. | Houston, TX 77090 | Oil & Gas Operator | Sep 2026 |
| 12095 | Whittier Operating Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2007 |
| 12096 | Whittington Energy Co. | Melbourne, FL 32901 | Oil & Gas Operator | Sep 2026 |
| 12097 | Whittington Operating Company | Houston, TX 77069 | Oil & Gas Operator | Sep 2026 |
| 12098 | Whittington, G. R. | Amarillo, TX 79109 | Oil & Gas Operator | Jan 1994 |
| 12099 | Whittington, G. R. Estate | Amarillo, TX 79109 | Oil & Gas Operator | Mar 2008 |
| 12100 | WHL Oil Corp. | Houston, TX 77227 | Oil & Gas Operator | Sep 1998 |