| 12201 | Westech Energy Corporation | Denver, CO 80237 | Oil & Gas Operator | Mar 2011 |
| 12202 | Westerly Exploration, Inc. | Houston, TX 77256 | Oil & Gas Operator | Dec 2025 |
| 12203 | Western Chief Oil & Gas Company | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 12204 | Western Chief Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 12205 | Western Disposal Systems, Inc. | Corrales, NM 87048 | Oil Operator | Dec 2025 |
| 12206 | Western DRLG. Co. | Longview, TX 75604 | Oil & Gas Operator | Nov 1996 |
| 12207 | Western Energy Group, LLC | Leander, TX 78641 | Oil & Gas Operator | Dec 2025 |
| 12208 | Western Energy Management, Inc. | Austin, TX 78716 | Oil & Gas Operator | Aug 1997 |
| 12209 | Western Field Exploration, Inc. | Dilley, TX 78017 | Oil & Gas Operator | Dec 2025 |
| 12210 | Western Gas Resources Storage | Denver, CO 80234 | Oil & Gas Operator | Jun 1999 |
| 12211 | Western Global Oil, Inc | Deerfld Beach, FL 33442 | Oil Operator | Dec 2025 |
| 12212 | Western Gulf Oil & Gas Inc. | Dallas, TX 75360 | Oil & Gas Operator | Jul 2000 |
| 12213 | Western Gulf Oil & Gas, LLC | Bishop, TX 78343 | Oil & Gas Operator | Dec 2025 |
| 12214 | Western Natural Gas Company | Shelby, MT 59474 | Oil & Gas Operator | Oct 2025 |
| 12215 | Western Oil Company | Midland, TX 79702 | Oil & Gas Operator | Jul 2014 |
| 12216 | Western Oil Producers Inc | Roswell, NM 88202 | Oil & Gas Operator | Jul 2005 |
| 12217 | Western Petroleum Company Inc | Tulsa, OK 74170-2676 | Oil & Gas Operator | Apr 2020 |
| 12218 | Western Petroleum Resources, Inc | Dallas, TX 75219 | Oil & Gas Operator | May 2021 |
| 12219 | Western Plains Resources LLC | Garden City, KS 67846 | Oil & Gas Operator | Sep 2025 |
| 12220 | Western Pride Resources, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Jan 2011 |
| 12221 | Western Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 12222 | Western Reserves Corporation | Abilene, TX 79608 | Oil & Gas Operator | Jan 2008 |
| 12223 | Western Reserves Oil Co Inc | Midland, TX 79705 | Oil & Gas Operator | Oct 2020 |
| 12224 | Western Sky Oil & Gas | Abilene, TX 79604 | Oil & Gas Operator | Aug 2003 |
| 12225 | Westgate Petroleum, Inc. | Fritch, TX 79036 | Oil & Gas Operator | Nov 2001 |
| 12226 | Westhall Associates, Inc. | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Aug 1997 |
| 12227 | Westico Energy Co. | Abilene, TX 79605 | Oil & Gas Operator | Nov 2004 |
| 12228 | Westlake Energy Consultants Corp | Thousand Oaks, CA 91362 | Oil & Gas Operator | Aug 2003 |
| 12229 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 12230 | Westlands Resources Corporation | Monrovia, CA 91016 | Oil & Gas Operator | Dec 2025 |
| 12231 | Westoil LLC | Austin, TX 78747 | Oil & Gas Operator | Dec 2025 |
| 12232 | Westover Production Co., LLC | Kermit, TX 79745 | Oil & Gas Operator | Dec 2025 |
| 12233 | Westpark Petroleum, Inc. | Austin, TX 78755 | Oil & Gas Operator | Dec 2025 |
| 12234 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 12235 | Westport Oil And Gas Company Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2002 |
| 12236 | Westridge Oil & Gas Properties | Mineral Wells, TX 76068 | Oil & Gas Operator | Dec 2025 |
| 12237 | Westside Energy Op. Co., LP | Oklahoma City, OK 73142 | Oil & Gas Operator | Jun 2008 |
| 12238 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Nov 2025 |
| 12239 | Weststar Operating Company | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2015 |
| 12240 | Westwin Energy I, LP | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 12241 | Westwood Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | May 2013 |
| 12242 | Wetwick DRLG. & Prod. | Carlsbad, TX 76934 | Oil Operator | Dec 2025 |
| 12243 | Wetzel Oil Company | Austin, TX 78738 | Oil & Gas Operator | May 2007 |
| 12244 | Weyerhaeuser Company | Crossett, AR 71635 | Oil & Gas Operator | Sep 1994 |
| 12245 | WF Company, LTD. | Midland, TX 79705 | Oil & Gas Operator | Oct 1995 |
| 12246 | WFMMS, Inc. | Batson, TX 77519 | Oil & Gas Operator | Dec 2025 |
| 12247 | WFW Production Company, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Dec 2025 |
| 12248 | WG Oil, LLC | Wichita Falls, TX 76308 | Oil Operator | Dec 2025 |
| 12249 | WG Operating, Inc. | Tulsa, OK 74153 | Oil & Gas Operator | May 2012 |
| 12250 | WGR, Inc. | Houston, TX 77046 | Gas Operator | Jul 2007 |
| 12251 | Wgsi Enterprise LLC | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Dec 2025 |
| 12252 | Wharton Oil Co. | Vernon, TX 76384 | Oil & Gas Operator | Dec 2000 |
| 12253 | Whatley, O. B. | Kilgore, TX 75662 | Oil & Gas Operator | Jun 1993 |
| 12254 | Whatley, O.B. Oil Company, Inc. | Bivins, TX 75555 | Oil & Gas Operator | Dec 2025 |
| 12255 | Wheat, Buck Resources, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Dec 2009 |
| 12256 | Wheeler Energy Co. | Tulsa, OK 74101 | Oil & Gas Operator | Nov 2025 |
| 12257 | Wheeler Energy, LLC | Tulsa, OK 74101 | Oil & Gas Operator | Dec 2025 |
| 12258 | Wheeler Oil Co. (A) | Amarillo, TX 79114 | Gas Operator | Apr 2001 |
| 12259 | Wheeler Operating Corporation | Fort Worth, TX 76109 | Oil & Gas Operator | Dec 2025 |
| 12260 | Whelan Brothers, Inc. | Oil City, LA 71061 | Oil & Gas Operator | May 2015 |
| 12261 | Whiskey River Oil & Gas LLC | Dallas, TX 75230 | Oil & Gas Operator | Apr 2024 |
| 12262 | Whitaker Properties, L. P. | Carthage, TX 75633 | Oil & Gas Operator | Sep 1997 |
| 12263 | Whitaker, Fred | Carthage, TX 75633 | Gas Operator | Mar 2001 |
| 12264 | Whitaker, Jerry | Sunset, TX 76270 | Oil & Gas Operator | May 2022 |
| 12265 | White Creek Energy | Three Rivers, TX 78071 | Oil & Gas Operator | Dec 2025 |
| 12266 | White Creek Energy, Inc. | San Antonio, TX 78246 | Oil & Gas Operator | Dec 2003 |
| 12267 | White Heart, Inc. | Georgetown, TX 78628 | Gas Operator | Jun 1996 |
| 12268 | White Knight Production LLC | Lafayette, LA 70505 | Oil & Gas Operator | Feb 2024 |
| 12269 | White Marlin Operating Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 12270 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Dec 2025 |
| 12271 | White Oak Production Company | Conway, AR 72034 | Oil & Gas Operator | Sep 2005 |
| 12272 | White Operating Company | Oklahoma City, OK 73159-7136 | Oil & Gas Operator | Nov 2025 |
| 12273 | White Pine Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 12274 | White River Operating LLC | Gilmer, TX 75644 | Oil & Gas Operator | Oct 2025 |
| 12275 | White Rock Exploration, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jul 2021 |
| 12276 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2025 |
| 12277 | White Sail Resources LLC | Austin, TX 78731 | Oil Operator | Dec 2025 |
| 12278 | White Stride LLC | Piedmont, OK 73078 | Oil & Gas Operator | Dec 2025 |
| 12279 | White Wing Petroleum | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 12280 | White Wing Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2012 |
| 12281 | White'S Industrial Engine'S | Houston, TX 77070 | Oil & Gas Operator | Dec 2025 |
| 12282 | White, Cecil | Monahans, TX 79756 | Oil & Gas Operator | Mar 2017 |
| 12283 | White, E. C. Oil Co. | Whiteface, TX 79379 | Oil & Gas Operator | Nov 2012 |
| 12284 | White, Frank | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 12285 | White, Jack Operating | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 12286 | White, Oscar | Tuscola, TX 79562 | Oil & Gas Operator | Dec 2025 |
| 12287 | White, Ralph H. | Midland, TX 79701 | Oil & Gas Operator | Oct 2002 |
| 12288 | Whitehall Operating Inc. | Houston, TX 77040 | Oil & Gas Operator | Nov 1994 |
| 12289 | Whitehawk Production Company | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 12290 | Whitehead Prod. Co., Inc. | Humble, TX 77338 | Oil & Gas Operator | Oct 2025 |
| 12291 | Whitehead Resources, LTD. | Buna, TX 77612 | Oil & Gas Operator | Dec 2025 |
| 12292 | Whiteman Industries Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | May 2025 |
| 12293 | Whitemound Oil Company | FT Stockton, TX 79735 | Oil & Gas Operator | Jan 2017 |
| 12294 | Whitesands Operating, L.L.C. | Corpus Chrsti, TX 78466 | Oil & Gas Operator | Mar 2025 |
| 12295 | Whitesands Resources, L.L.C. | Corpus Chrsti, TX 78466 | Oil Operator | Jun 2019 |
| 12296 | Whiteside, H. W. | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 12297 | Whiteside, Robert | Comanche, TX 76442 | Oil & Gas Operator | May 1998 |
| 12298 | Whitfield Energy | Midland, TX 79702 | Oil & Gas Operator | Jan 1999 |
| 12299 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 12300 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |