| 301 | Whitemound Oil Company | FT Stockton, TX 79735 | Oil & Gas Operator | Jan 2017 |
| 302 | Whitesands Operating, L.L.C. | Corpus Chrsti, TX 78466 | Oil & Gas Operator | Mar 2025 |
| 303 | Whitesands Resources, L.L.C. | Corpus Chrsti, TX 78466 | Oil Operator | Jun 2019 |
| 304 | Whiteside, H. W. | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 305 | Whiteside, Robert | Comanche, TX 76442 | Oil & Gas Operator | May 1998 |
| 306 | Whitfield Energy | Midland, TX 79702 | Oil & Gas Operator | Jan 1999 |
| 307 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 308 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 309 | Whitlock, J.R. Operator | Amarillo, TX 79105 | Gas Operator | Jul 1997 |
| 310 | Whitman-Dome Energy Corporation | San Diego, CA 92101 | Oil & Gas Operator | Nov 1996 |
| 311 | Whitmar Exploration Company | Denver, CO 80202 | Oil & Gas Operator | Aug 2025 |
| 312 | Whitson, James A., Jr. | Houston, TX 77063 | Oil & Gas Operator | Nov 2011 |
| 313 | Whitt Investments, Inc. | Graham, TX 76450 | Oil Operator | Dec 2019 |
| 314 | Whitt Oil & Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 315 | Whitt, W. J. | Albany, TX 76430 | Oil & Gas Operator | Nov 1996 |
| 316 | Whitten Energy Corp. | Houston, TX 77090 | Oil & Gas Operator | Dec 2025 |
| 317 | Whittier Operating Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2007 |
| 318 | Whittington Energy Co. | Melbourne, FL 32901 | Oil & Gas Operator | Dec 2025 |
| 319 | Whittington Operating Company | Houston, TX 77069 | Oil & Gas Operator | Dec 2025 |
| 320 | Whittington, G. R. | Amarillo, TX 79109 | Oil & Gas Operator | Jan 1994 |
| 321 | Whittington, G. R. Estate | Amarillo, TX 79109 | Oil & Gas Operator | Mar 2008 |
| 322 | Whittington, James C., Inc. | Dallas, TX 75214 | Oil & Gas Operator | Jan 2017 |
| 323 | WHL Oil Corp. | Houston, TX 77227 | Oil & Gas Operator | Sep 1998 |
| 324 | Wichita Falls Oil Expl. Co. | Holliday, TX 76366 | Oil & Gas Operator | Dec 2025 |
| 325 | Wichita Operating Company, Inc. | Spring, TX 77393 | Oil & Gas Operator | May 2009 |
| 326 | Wigington, James Robert | Ackerly, TX 79713 | Oil & Gas Operator | Aug 2003 |
| 327 | Wilbanks Energy Corporation | Houston, TX 77036 | Oil & Gas Operator | Dec 2001 |
| 328 | Wilbanks Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 329 | Wilbanks Reserve Corporation | Denver, CO 80203 | Oil & Gas Operator | Dec 2025 |
| 330 | Wilbanks, Bruce & G.L. | Midland, TX 79702 | Oil & Gas Operator | Aug 1996 |
| 331 | Wilbanks, Bruce A. | Midland, TX 79701 | Oil & Gas Operator | Aug 1996 |
| 332 | Wilbanks, Bruce A. Company | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 333 | Wilbrook Exploration, Inc. | Lingleville, TX 76461 | Oil & Gas Operator | Aug 2003 |
| 334 | Wilchar, DR. R. B. | Fort Worth, TX 76185 | Oil & Gas Operator | Jan 2007 |
| 335 | Wilco Operating | Monahans, TX 79756 | Oil & Gas Operator | Dec 2025 |
| 336 | Wilco Properties, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Jan 2004 |
| 337 | Wilcox Energy Company LLC | Rule, TX 79547 | Oil & Gas Operator | Dec 2025 |
| 338 | Wilcox Oil Company | Rule, TX 79547 | Oil & Gas Operator | Aug 2008 |
| 339 | Wilcox Operating Corporation | Shreveport, LA 71115 | Oil & Gas Operator | Dec 2025 |
| 340 | Wilcox Petroleum Operating LLC. | Rule, TX 79547 | Oil & Gas Operator | Dec 2025 |
| 341 | Wild Cat Operating Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 342 | Wild Horse Energy | Paducah, TX 79248 | Oil & Gas Operator | Dec 2025 |
| 343 | Wildcat Cement Co. | Shamrock, TX 79079 | Oil & Gas Operator | May 2015 |
| 344 | Wildcat Energy, LLC | Odessa, TX 79768 | Oil & Gas Operator | Jul 2021 |
| 345 | Wildco Resources, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Dec 2025 |
| 346 | Wildfire Energy Operating LLC | Houston, TX 77224 | Oil & Gas Operator | Dec 2025 |
| 347 | Wildhorse Oil & Gas Corporation | Ardmore, OK 73402 | Oil & Gas Operator | May 2019 |
| 348 | Wildhorse Operating Company | Ardmore, OK 73402 | Oil & Gas Operator | Dec 2025 |
| 349 | Wildhorse Resources MNGT Co, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2019 |
| 350 | Wildhorse Resources, LLC | Houston, TX 77279 | Oil & Gas Operator | Feb 2015 |
| 351 | Wiley Lease Co., LTD. | Jourdanton, TX 78026 | Oil Operator | Dec 2025 |
| 352 | Wilham Investments, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Jan 2020 |
| 353 | Wilhite Productions | MC Dade, TX 78650 | Oil & Gas Operator | Oct 2012 |
| 354 | Will Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Aug 2025 |
| 355 | Will-Drill Operating, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | Dec 2025 |
| 356 | Will-Drill Production Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Dec 2025 |
| 357 | William Fleming Productions, LLC | Wichita Falls, TX 76305 | Oil Operator | Feb 2025 |
| 358 | Williams Deville Operating, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2025 |
| 359 | Williams Oil Company | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 360 | Williams Petroleum Company, Inc. | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2025 |
| 361 | Williams Prod. Gulf Coast, L.P. | Benbrook, TX 76126 | Oil & Gas Operator | Jan 2012 |
| 362 | Williams Production RMT Company | Denver, CO 80202 | Oil & Gas Operator | Oct 2010 |
| 363 | Williams, A. Oil | Wichita Falls, TX 76308 | Oil Operator | Dec 2025 |
| 364 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Dec 2025 |
| 365 | Williams, Clayton Energy, L.L.C | Midland, TX 79705 | Oil & Gas Operator | May 1993 |
| 366 | Williams, Clayton W., Jr., Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 367 | Williams, H. E. | Houston, TX 77002 | Oil & Gas Operator | Dec 1994 |
| 368 | Williams, W. R. | Amarillo, TX 79105 | Oil & Gas Operator | Jun 2013 |
| 369 | Williams, W. R., Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Feb 2024 |
| 370 | Williams-Cody, Inc. | Houston, TX 77060 | Oil & Gas Operator | May 1994 |
| 371 | Williamson Oil & Gas, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Dec 2024 |
| 372 | Williamson Operating Co. | Uvalde, TX 78801 | Oil & Gas Operator | Dec 2025 |
| 373 | Williamson Operating Co., LLC | Stamps, AR 71860 | Oil & Gas Operator | Dec 2025 |
| 374 | Williamson, J. C. | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 375 | Williamson, Ralph E. | Midland, TX 79702 | Oil & Gas Operator | Jan 2012 |
| 376 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2025 |
| 377 | Williford Petroleum, L.L.C. | Green CV SPGS, FL 32043 | Oil & Gas Operator | Dec 2025 |
| 378 | Willis Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 379 | Willo Oil & Gas Exploration, LLC | Boerne, TX 78006 | Oil & Gas Operator | Jul 2020 |
| 380 | Willow Bend Oil LLC | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 381 | Willow Creek Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2009 |
| 382 | Willow Springs Prod. Serv.,LLC | Kilgore, TX 75663 | Oil & Gas Operator | Aug 1997 |
| 383 | Willow Springs Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 1999 |
| 384 | Willowbend Investments, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 385 | Wills Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1995 |
| 386 | Wills Oil Holdings, L.L.C. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 387 | Willstar Energy GP, LLC | Houston, TX 77279 | Oil & Gas Operator | Sep 2013 |
| 388 | Wilmoth Interests, Inc. | Marion Center, PA 15759 | Oil & Gas Operator | Aug 2025 |
| 389 | Wilshire Oil Co. Of Texas | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2004 |
| 390 | Wilson - Owens Production Co. | Longview, TX 75601 | Oil & Gas Operator | Nov 1998 |
| 391 | Wilson Brothers Leasing Co., Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2015 |
| 392 | Wilson Energy LLC | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 393 | Wilson Energy Resources LLC | Graham, TX 76450 | Oil Operator | Dec 2025 |
| 394 | Wilson Exploration Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 1996 |
| 395 | Wilson Hydrocarbon Inc. | Houston, TX 77066 | Oil & Gas Operator | Dec 2025 |
| 396 | Wilson Oil Co. | Houston, TX 77263 | Oil & Gas Operator | Dec 2025 |
| 397 | Wilson Operating Co. | Archer City, TX 76351 | Oil & Gas Operator | Dec 2025 |
| 398 | Wilson Operating Company LLC | Tulsa, OK 74105 | Oil & Gas Operator | Dec 2025 |
| 399 | Wilson Operating Service Inc | Brownfield, TX 79316 | Oil & Gas Operator | Aug 2003 |
| 400 | Wilson Petroleum Co. | Springfield, MO 65803 | Oil & Gas Operator | Dec 2025 |