| 201 | Westar Energy, Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 202 | Westbrook Oil & Gas Co. Inc. | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2024 |
| 203 | Westco Oil Company | Ozona, TX 76943 | Oil & Gas Operator | Nov 2024 |
| 204 | Westech Energy Corporation | Denver, CO 80237 | Oil & Gas Operator | Mar 2011 |
| 205 | Westerly Exploration, Inc. | Houston, TX 77256 | Oil & Gas Operator | Nov 2024 |
| 206 | Western Chief Oil & Gas Company | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 207 | Western Chief Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Nov 2024 |
| 208 | Western Disposal Systems, Inc. | Corrales, NM 87048 | Oil Operator | Nov 2024 |
| 209 | Western DRLG. Co. | Longview, TX 75604 | Oil & Gas Operator | Nov 1996 |
| 210 | Western Energy Group, LLC | Leander, TX 78641 | Oil & Gas Operator | Nov 2024 |
| 211 | Western Energy Management, Inc. | Austin, TX 78716 | Oil & Gas Operator | Aug 1997 |
| 212 | Western Field Exploration, Inc. | Dilley, TX 78017 | Oil & Gas Operator | Nov 2024 |
| 213 | Western Gas Resources Storage | Denver, CO 80234 | Oil & Gas Operator | Jun 1999 |
| 214 | Western Global Oil, Inc | Deerfld Beach, FL 33442 | Oil Operator | Nov 2024 |
| 215 | Western Gulf Oil & Gas Inc. | Dallas, TX 75360 | Oil & Gas Operator | Jul 2000 |
| 216 | Western Gulf Oil & Gas, LLC | Bishop, TX 78343 | Oil & Gas Operator | Nov 2024 |
| 217 | Western Natural Gas Company | Shelby, MT 59474 | Oil & Gas Operator | Jul 2024 |
| 218 | Western Oil Company | Midland, TX 79702 | Oil & Gas Operator | Jul 2014 |
| 219 | Western Oil Producers Inc | Roswell, NM 88202 | Oil & Gas Operator | Jul 2005 |
| 220 | Western Petroleum Company Inc | Tulsa, OK 74170-2676 | Oil & Gas Operator | Apr 2020 |
| 221 | Western Petroleum Resources, Inc | Dallas, TX 75219 | Oil & Gas Operator | May 2021 |
| 222 | Western Plains Resources LLC | Garden City, KS 67846 | Oil & Gas Operator | Jul 2024 |
| 223 | Western Pride Resources, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Jan 2011 |
| 224 | Western Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2024 |
| 225 | Western Reserves Corporation | Abilene, TX 79608 | Oil & Gas Operator | Jan 2008 |
| 226 | Western Reserves Oil Co Inc | Midland, TX 79705 | Oil & Gas Operator | Oct 2020 |
| 227 | Western Sky Oil & Gas | Abilene, TX 79604 | Oil & Gas Operator | Aug 2003 |
| 228 | Westgate Petroleum, Inc. | Fritch, TX 79036 | Oil & Gas Operator | Nov 2001 |
| 229 | Westhall Associates, Inc. | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Aug 1997 |
| 230 | Westico Energy Co. | Abilene, TX 79605 | Oil & Gas Operator | Nov 2004 |
| 231 | Westlake Energy Consultants Corp | Thousand Oaks, CA 91362 | Oil & Gas Operator | Aug 2003 |
| 232 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 233 | Westlands Resources Corporation | Monrovia, CA 91016 | Oil & Gas Operator | Nov 2024 |
| 234 | Westoil LLC | Austin, TX 78747 | Oil & Gas Operator | Nov 2024 |
| 235 | Westover Production Co., LLC | Kermit, TX 79745 | Oil & Gas Operator | Nov 2024 |
| 236 | Westpark Petroleum, Inc. | Austin, TX 78755 | Oil & Gas Operator | Nov 2024 |
| 237 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 238 | Westport Oil And Gas Company Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2002 |
| 239 | Westridge Oil & Gas Properties | Mineral Wells, TX 76068 | Oil & Gas Operator | Nov 2024 |
| 240 | Westside Energy Op. Co., LP | Oklahoma City, OK 73142 | Oil & Gas Operator | Jun 2008 |
| 241 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Sep 2024 |
| 242 | Weststar Operating Company | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2015 |
| 243 | Westwin Energy I, LP | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 244 | Westwood Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | May 2013 |
| 245 | Wetwick DRLG. & Prod. | Carlsbad, TX 76934 | Oil Operator | Nov 2024 |
| 246 | Wetzel Oil Company | Austin, TX 78738 | Oil & Gas Operator | May 2007 |
| 247 | Weyerhaeuser Company | Crossett, AR 71635 | Oil & Gas Operator | Sep 1994 |
| 248 | WF Company, LTD. | Midland, TX 79705 | Oil & Gas Operator | Oct 1995 |
| 249 | WFMMS, Inc. | Batson, TX 77519 | Oil & Gas Operator | Nov 2024 |
| 250 | WFW Production Company, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Nov 2024 |
| 251 | WG Oil, LLC | Wichita Falls, TX 76308 | Oil Operator | Nov 2024 |
| 252 | WG Operating, Inc. | Tulsa, OK 74153 | Oil & Gas Operator | May 2012 |
| 253 | WGR, Inc. | Houston, TX 77046 | Gas Operator | Jul 2007 |
| 254 | Wharton Oil Co. | Vernon, TX 76384 | Oil & Gas Operator | Dec 2000 |
| 255 | Whatley, O. B. | Kilgore, TX 75662 | Oil & Gas Operator | Jun 1993 |
| 256 | Whatley, O.B. Oil Company, Inc. | Bivins, TX 75555 | Oil & Gas Operator | Nov 2024 |
| 257 | Wheat, Buck Resources, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Dec 2009 |
| 258 | Wheeler Energy Co. | Tulsa, OK 74101 | Oil & Gas Operator | Sep 2024 |
| 259 | Wheeler Energy, LLC | Tulsa, OK 74101 | Oil & Gas Operator | Nov 2024 |
| 260 | Wheeler Midstream LLC | Houston, TX 77002 | Oil & Gas Operator | May 2018 |
| 261 | Wheeler Oil Co. (A) | Amarillo, TX 79114 | Gas Operator | Apr 2001 |
| 262 | Wheeler Operating Corporation | Fort Worth, TX 76101 | Oil & Gas Operator | Nov 2024 |
| 263 | Whelan Brothers, Inc. | Oil City, LA 71061 | Oil & Gas Operator | May 2015 |
| 264 | Whiskey River Oil & Gas LLC | Dallas, TX 75230 | Oil & Gas Operator | Apr 2024 |
| 265 | Whitaker Properties, L. P. | Carthage, TX 75633 | Oil & Gas Operator | Sep 1997 |
| 266 | Whitaker, Jerry | Sunset, TX 76270 | Oil & Gas Operator | May 2022 |
| 267 | White Creek Energy | Three Rivers, TX 78071 | Oil & Gas Operator | Nov 2024 |
| 268 | White Knight Production LLC | Lafayette, LA 70505 | Oil & Gas Operator | Feb 2024 |
| 269 | White Marlin Operating Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 270 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Nov 2024 |
| 271 | White Oak Production Company | Conway, AR 72034 | Oil & Gas Operator | Sep 2005 |
| 272 | White Operating Company | Oklahoma City, OK 73159-7136 | Oil & Gas Operator | Sep 2024 |
| 273 | White Pine Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 274 | White River Energy LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2010 |
| 275 | White River Operating LLC | Gilmer, TX 75644 | Oil & Gas Operator | Aug 2024 |
| 276 | White Rock Exploration, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jul 2021 |
| 277 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Nov 2024 |
| 278 | White Sail Resources LLC | Austin, TX 78731 | Oil Operator | Nov 2024 |
| 279 | White Stride LLC | Yukon, OK 73085 | Oil & Gas Operator | Nov 2024 |
| 280 | White Wing Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2012 |
| 281 | White'S Industrial Engine'S | Houston, TX 77070 | Oil & Gas Operator | Nov 2024 |
| 282 | White, Cecil | Monahans, TX 79756 | Oil & Gas Operator | Mar 2017 |
| 283 | White, E. C. Oil Co. | Whiteface, TX 79379 | Oil & Gas Operator | Nov 2012 |
| 284 | White, Frank | Abilene, TX 79604 | Oil & Gas Operator | Nov 2024 |
| 285 | White, Jack Operating | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 2024 |
| 286 | White, Oscar | Tuscola, TX 79562 | Oil & Gas Operator | Nov 2024 |
| 287 | White, R. D. Oil Co. | Snyder, TX 79549 | Oil & Gas Operator | Nov 2024 |
| 288 | White, Ralph H. | Midland, TX 79701 | Oil & Gas Operator | Oct 2002 |
| 289 | Whitehall Operating Inc. | Houston, TX 77040 | Oil & Gas Operator | Nov 1994 |
| 290 | Whitehawk Production Company | Midland, TX 79710 | Oil & Gas Operator | Nov 2024 |
| 291 | Whitehead Prod. Co., Inc. | Humble, TX 77338 | Oil & Gas Operator | Sep 2024 |
| 292 | Whitehead Resources, LTD. | Buna, TX 77612 | Oil & Gas Operator | Nov 2024 |
| 293 | Whiteman Industries, Inc. | Oklahoma City, OK 73101 | Oil & Gas Operator | Jun 2024 |
| 294 | Whitemound Oil Company | FT Stockton, TX 79735 | Oil & Gas Operator | Jan 2017 |
| 295 | Whitesands Operating, L.L.C. | Corpus Chrsti, TX 78466 | Oil & Gas Operator | Nov 2024 |
| 296 | Whitesands Resources, L.L.C. | Corpus Chrsti, TX 78466 | Oil Operator | Jun 2019 |
| 297 | Whiteside, H. W. | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 298 | Whiteside, Robert | Comanche, TX 76442 | Oil & Gas Operator | May 1998 |
| 299 | Whitfield Energy | Midland, TX 79702 | Oil & Gas Operator | Jan 1999 |
| 300 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |