| 301 | Below Ground Level LLC | Sand Springs, OK 74063 | Oil & Gas Operator | Dec 2025 |
| 302 | Belter Inc. | Seymour, TX 76380 | Oil Operator | Dec 2025 |
| 303 | Belvan Corp. | Midland, TX 79701 | Oil & Gas Operator | Jun 1998 |
| 304 | Benchmark Oil & Gas Co. | Houston, TX 77282 | Oil & Gas Operator | Dec 2025 |
| 305 | Benchmark Production, LLC | Midland, TX 79701 | Oil Operator | May 2006 |
| 306 | Benchmark Texas Petroleum, LLC. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 307 | Benco Energy Inc | Tionesta, PA 16353-5851 | Oil & Gas Operator | Dec 2002 |
| 308 | Benco Operating, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 309 | Bend Petroleum Corp. | Muenster, TX 76252 | Oil & Gas Operator | Nov 2023 |
| 310 | Bendorf Services & Supply Co | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2000 |
| 311 | Bendorf, Otto Trust | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2000 |
| 312 | Benedum-Trees Oil Company | Chicago, IL 60673 | Oil & Gas Operator | Dec 2005 |
| 313 | Bengal Petroleum USA, LLC | Austin, TX 78767 | Oil Operator | Dec 2025 |
| 314 | Benn Oil & Gas | Perryton, TX 79070 | Oil & Gas Operator | Jun 2005 |
| 315 | Bennett Oil | Dale, TX 78616 | Oil & Gas Operator | Sep 2000 |
| 316 | Bennett Production Corporation | Bowie, TX 76230 | Oil & Gas Operator | Apr 2024 |
| 317 | Bennett Resources, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 318 | Bennett, M. Brad Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2005 |
| 319 | Bennett, M. Brad LP | Midland, TX 79710 | Oil & Gas Operator | Jan 2006 |
| 320 | Bennett, M. Troy, Jr. | Freer, TX 78357 | Oil & Gas Operator | Dec 2025 |
| 321 | Bennett, Mills Estate | Houston, TX 77057 | Oil & Gas Operator | Sep 1995 |
| 322 | Bennett, Patricia | Dale, TX 78616 | Oil & Gas Operator | Sep 2025 |
| 323 | Bennett, R. C., Company | Midland, TX 79702 | Oil & Gas Operator | Dec 2019 |
| 324 | Benson & Schoen Oil Co., Inc. | Abilene, TX 79602 | Oil & Gas Operator | Apr 2012 |
| 325 | Benson Mineral Group, Inc. | Denver, CO 80202 | Oil & Gas Operator | Apr 2022 |
| 326 | Benson-McCown & Company | Amarillo, TX 79114 | Oil & Gas Operator | Jul 2016 |
| 327 | Benson-Wyatt Oil Co. Inc. | Austin, TX 78767 | Oil & Gas Operator | Jul 2003 |
| 328 | Bent Oak Energy Interests, LLC | Houston, TX 77024 | Oil Operator | Oct 2014 |
| 329 | Bent Wing Energy, LLC | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 330 | Bentgrass Of Texas, Inc. | Abilene, TX 79608 | Oil Operator | Dec 2025 |
| 331 | Bentley Oil & Gas Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 332 | Bep Operating, LLC | Pearland, TX 77581 | Oil & Gas Operator | Dec 2025 |
| 333 | Bepco Operating Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2006 |
| 334 | Bepco, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2008 |
| 335 | Beren Corporation | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 336 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Oct 2025 |
| 337 | Berexco Inc. | Wichita, KS 67208 | Oil & Gas Operator | Oct 2009 |
| 338 | Berexco LLC | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 339 | Berg Laney & Brown | Smackover, AR 71762 | Oil & Gas Operator | Jul 1995 |
| 340 | Bergman Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Feb 1994 |
| 341 | Bering Operating Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | May 2001 |
| 342 | Berkshire Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 343 | Berkshire Woodlawn Field, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2007 |
| 344 | Berry Energy Companies | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 345 | Berry Oil Comp. | Houston, TX 77002 | Oil & Gas Operator | Jul 2014 |
| 346 | Berry Oil Company, LLC | Bakersfield, CA 93311 | Oil & Gas Operator | Apr 2019 |
| 347 | Berry Petroleum Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2014 |
| 348 | Berry Petroleum Company LLC | Bakersfield, CA 93311 | Oil & Gas Operator | Oct 2025 |
| 349 | Berry, Gus | Okmulgee, OK 74447 | Oil & Gas Operator | Feb 1996 |
| 350 | Berry, O. H. | Midland, TX 79702 | Oil & Gas Operator | Dec 1993 |
| 351 | Berry, Thomas N. & Co. | Stillwater, OK 74076 | Oil & Gas Operator | Feb 2012 |
| 352 | Bertram Oil Company, Inc. | Corpus Chrsti, TX 78475 | Oil & Gas Operator | Oct 1995 |
| 353 | Beryl Oil And Gas, LP | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 354 | Besco Operating, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 355 | Best Petroleum Explorations,Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2025 |
| 356 | Besto Oil & Gas, Inc. | Odessa, TX 79768 | Oil & Gas Operator | Oct 2018 |
| 357 | Bet-Ro, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | Dec 2025 |
| 358 | Beta Gas & Oil, Inc. | Tulsa, OK 74136 | Oil Operator | Jun 2001 |
| 359 | Beta Oil Corporation | San Antonio, TX 78232 | Oil & Gas Operator | Dec 2025 |
| 360 | Beta Operating Company, LLC | Houston, TX 77210 | Oil & Gas Operator | Apr 2020 |
| 361 | Beta-Tex, An Oklahoma Corp. | Oklahoma City, OK 73157 | Oil & Gas Operator | Aug 2024 |
| 362 | Beth Ann Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Jul 2001 |
| 363 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 364 | Betwell Oil & Gas Company | Hialeah, FL 33002 | Oil & Gas Operator | Dec 2025 |
| 365 | Beusa Energy, Inc. | Spring, TX 77380 | Oil & Gas Operator | Apr 2011 |
| 366 | Bevers SWD, Inc. | Lubbock, TX 79453 | Oil & Gas Operator | Dec 2025 |
| 367 | Bevo Production Co. | Amarillo, TX 79101 | Oil & Gas Operator | Dec 2014 |
| 368 | Bex, Inc. | Nashville, TN 37209 | Oil & Gas Operator | Aug 2007 |
| 369 | Bexco Operating, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Dec 2025 |
| 370 | BFD Energy Corporation | Georgetown, TX 78628 | Gas Operator | May 1998 |
| 371 | BFP Oil Company | Frisco, TX 75034 | Oil & Gas Operator | Dec 2025 |
| 372 | BGM Production, LLC | Borger, TX 79008 | Oil & Gas Operator | Dec 2025 |
| 373 | BHB Operating Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Dec 2025 |
| 374 | BHP Billiton Pet(Txla Op) Co | Denver, CO 80202 | Oil & Gas Operator | Jul 2019 |
| 375 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 376 | Biehl Oil Service'S LLC | Bellevue, TX 76228 | Oil & Gas Operator | Nov 2017 |
| 377 | Biffle, Jimmy Jack | Muenster, TX 76252 | Oil & Gas Operator | Feb 2017 |
| 378 | Big "6" Drilling Company | Houston, TX 77063 | Oil & Gas Operator | Mar 2019 |
| 379 | Big Al Oil And Gas | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 380 | Big Country Pipe & Supply, Inc. | Saint Jo, TX 76265 | Oil Operator | May 2023 |
| 381 | Big Creek Energy LLC | Kingfisher, OK 73750-3102 | Oil & Gas Operator | Sep 2025 |
| 382 | Big Creek Operating Company LLC | Houston, TX 77065 | Oil & Gas Operator | Dec 2025 |
| 383 | Big D Energy Company | New Braunfels, TX 78132 | Oil & Gas Operator | Dec 2025 |
| 384 | Big Easy Operating Company | Houston, TX 77056 | Oil & Gas Operator | Aug 2003 |
| 385 | Big Iron Excavation, L.L.C. | Blanket, TX 76432 | Oil Operator | Jan 2022 |
| 386 | Big Lake Corporation | Dallas, TX 75222 | Oil & Gas Operator | Dec 2025 |
| 387 | Big Lake J J Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Dec 2025 |
| 388 | Big Mountain Operating LLC | Decatur, TX 76234 | Oil & Gas Operator | Dec 2025 |
| 389 | Big Rock Oil LLC | Frisco, TX 75034 | Oil Operator | Dec 2025 |
| 390 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 391 | Big Shell Oil & Gas, Inc. | Taft, TX 78390 | Oil & Gas Operator | Dec 2025 |
| 392 | Big Sky Energy, LLC | Cody, WY 82414 | Oil & Gas Operator | May 2024 |
| 393 | Big Star Exploration | Fort Worth, TX 76121 | Oil & Gas Operator | Dec 2025 |
| 394 | Big Star Oil & Gas, LLC | Midland, TX 79710 | Oil & Gas Operator | Sep 2017 |
| 395 | Big State Industries, Inc. | Houston, TX 77010 | Oil & Gas Operator | Apr 2024 |
| 396 | Big Three Oil Company | Windthorst, TX 76389 | Oil & Gas Operator | Jul 2006 |
| 397 | Big Tio, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Dec 2025 |
| 398 | Big W Oil Company | Graham, TX 76450 | Oil & Gas Operator | May 2017 |
| 399 | Big Wells Energy Corp | Katy, TX 77494 | Oil & Gas Operator | Sep 2019 |
| 400 | Bigfoot Energy Services LLC | Carthage, TX 75633 | Oil & Gas Operator | Aug 2024 |