| 301 | Brooklyn Union Expl. Co., Inc. | | Oil & Gas Operator | Jul 1994 |
| 302 | Brooks And Lee | | Oil & Gas Operator | Dec 1994 |
| 303 | Brooks Oil Company | Kilgore, TX 75662 | Oil & Gas Operator | Apr 2026 |
| 304 | Brookston Energy, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Apr 2026 |
| 305 | Brookwater Energy Services, LLC | | Oil & Gas Operator | Dec 2024 |
| 306 | Brown & McKenzie, Inc. | | Oil & Gas Operator | May 1984 |
| 307 | Brown Oil Properties | | Oil Operator | Nov 1983 |
| 308 | Brown Operating & MGMT Corp. | | Oil & Gas Operator | Feb 1991 |
| 309 | Browning Oil Company, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Apr 2026 |
| 310 | Broyles Oil & Gas, Inc. | | Oil & Gas Operator | Jun 1994 |
| 311 | Broyles-Wheless Industries Inc | | Oil & Gas Operator | Apr 1993 |
| 312 | Bruce H. Weaver & Sons | | Oil Operator | Jan 2025 |
| 313 | Bruce H. Weaver Prod. | | Oil Operator | Nov 1987 |
| 314 | Bruce N. Lynn | | Oil & Gas Operator | Sep 1994 |
| 315 | Brumar, Inc. | | Oil Operator | Dec 1995 |
| 316 | Brumley Prod. | | Oil & Gas Operator | Jun 2006 |
| 317 | Brushy Creek Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Apr 2026 |
| 318 | Bruxoil, Inc. | | Oil & Gas Operator | Jan 2026 |
| 319 | Bryant Oil & Gas Corporation | | Oil & Gas Operator | Mar 1987 |
| 320 | Bse Production Co. | Victoria, TX 77903 | Oil & Gas Operator | Apr 2026 |
| 321 | Bsfi Western E & P, Inc. | | Oil & Gas Operator | Jun 2005 |
| 322 | Bsi Operating, LLC | | Oil & Gas Operator | Dec 2019 |
| 323 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 324 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 325 | Buckeye Petroleum Company, Inc | | Oil & Gas Operator | Apr 1983 |
| 326 | Bud'S Pumping Service Inc. | | Oil Operator | Dec 1997 |
| 327 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Apr 2026 |
| 328 | Bull Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Apr 2026 |
| 329 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 330 | Burk Royalty Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2002 |
| 331 | Burkhart Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2002 |
| 332 | Burlington Res Offshore Inc | | Oil & Gas Operator | Oct 2002 |
| 333 | Burlington Res Oil & Gas Co | | Oil & Gas Operator | Dec 2000 |
| 334 | Burlington Res Oil & Gas LP | | Oil & Gas Operator | Mar 2013 |
| 335 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2026 |
| 336 | Burnham & Browning DRLG Co. | | Oil Operator | Oct 1990 |
| 337 | Burns Oil & Gas Expl. | | Oil & Gas Operator | Jan 1985 |
| 338 | Burrill Oil | | Oil Operator | Aug 1990 |
| 339 | Burrite Operating, LLC | | Oil Operator | Dec 2024 |
| 340 | Burton-Sutton Oil Co., Inc. | | Oil & Gas Operator | Apr 1988 |
| 341 | Bushwood Leasing, LLC | | Oil Operator | Dec 2024 |
| 342 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |
| 343 | Byargeon & Sons Oil Co. | | Oil Operator | Nov 2000 |
| 344 | Byron Ruple | | Oil Operator | Jan 2025 |