| 301 | B. M. Hester | | Oil & Gas Operator | Mar 1993 |
| 302 | Baby Oil, Inc. | | Oil & Gas Operator | Oct 2017 |
| 303 | Baca Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2000 |
| 304 | Bach Energy Corporation | | Oil & Gas Operator | Jul 1992 |
| 305 | Bachman Resources Group Inc. | | Oil Operator | Nov 2024 |
| 306 | Bachtell Oil & Gas, LTD. | Longview, TX 75605 | Oil & Gas Operator | May 2025 |
| 307 | Backus & Lanford | | Oil Operator | Aug 1985 |
| 308 | Backus,Barnwell& Von Gonten | | Oil & Gas Operator | Oct 1984 |
| 309 | Badak Energy Inc. | | Oil & Gas Operator | Oct 2020 |
| 310 | Badak Energy-Carraway Co | | Oil Operator | Dec 1990 |
| 311 | Badger Energy LLC | | Oil & Gas Operator | Dec 2024 |
| 312 | Badger Oil Corporation | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2011 |
| 313 | Badger Oil/Clovelly Oil | | Oil & Gas Operator | Oct 2004 |
| 314 | Baham Energy Services, LLC | | Oil Operator | Dec 2024 |
| 315 | Balco Energy Corporation | | Oil & Gas Operator | Jul 1983 |
| 316 | Ball Marketing, Inc. | | Oil & Gas Operator | Sep 1999 |
| 317 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 318 | Bandera Oil & Gas Inc | Fulshear, TX 77441 | Oil & Gas Operator | May 2025 |
| 319 | Barataria Production SVCS, LLC | | Oil Operator | Sep 2009 |
| 320 | Barco Co. | | Oil & Gas Operator | Dec 2000 |
| 321 | Barcoo Exploration Inc. | | Gas Operator | Jan 1993 |
| 322 | Barfield Oil Corporation | | Oil & Gas Operator | Mar 2001 |
| 323 | Bargo Energy Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 324 | Bargo Energy Corporation | | Oil & Gas Operator | Apr 2000 |
| 325 | Barnett Drilling & Production | | Gas Operator | Oct 1986 |
| 326 | Barnett Serio | | Gas Operator | Oct 1992 |
| 327 | Barnett Serio Exploration Co | | Oil & Gas Operator | Oct 1992 |
| 328 | Barnette & Sons, Inc | Dubach, LA 71235 | Oil & Gas Operator | Mar 2011 |
| 329 | Barnhart Co. | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 330 | Barnwell Oil Company, Inc. | | Oil & Gas Operator | Sep 1991 |
| 331 | Barnwell Petroleum Corp. | | Oil & Gas Operator | Sep 1978 |
| 332 | Barron Utilities, Inc. | | Oil Operator | Jun 1999 |
| 333 | Barry & Campbell | | Oil & Gas Operator | Apr 1981 |
| 334 | Barry Rock Oil Co. Inc. | Plain Dealing, LA 71064 | Oil & Gas Operator | Dec 2024 |
| 335 | Barton Oil & Gas Co., Inc. | | Oil & Gas Operator | Sep 1993 |
| 336 | Baruch-Foster Corporation | Oklahoma City, OK 73126-6770 | Oil & Gas Operator | Feb 2001 |
| 337 | Bas Production, LLC | | Oil Operator | Nov 2019 |
| 338 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | May 2025 |
| 339 | Basf Corporation | Houston, TX 77027 | Oil & Gas Operator | Nov 1992 |
| 340 | Basic Earth Science Sys, Inc | | Oil Operator | May 1987 |
| 341 | Basic Energy & Affil Res. Inc. | | Oil & Gas Operator | May 2000 |
| 342 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | May 2025 |
| 343 | Basin Petroleum, Inc. | | Oil & Gas Operator | Jul 1995 |
| 344 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 345 | Bass-Franks | | Oil & Gas Operator | Jun 1997 |
| 346 | Baxter Drill. & Explor., Inc. | | Oil Operator | Jun 1997 |
| 347 | Bay Coquille, Inc. | | Oil & Gas Operator | Jun 2023 |
| 348 | Bay Gas, LLC | | Oil & Gas Operator | Mar 2025 |
| 349 | Bayou Bouillon Operating LLC | | Oil & Gas Operator | Dec 2024 |
| 350 | Bayou Carencro Oil Co. Inc. | | Oil Operator | Apr 2022 |
| 351 | Bayou Choctaw, Inc. | | Oil & Gas Operator | Jun 2004 |
| 352 | Bayou Couba Oil Company | | Oil & Gas Operator | May 2002 |
| 353 | Bayou Drilling Fluids, Inc. | | Gas Operator | Jul 2020 |
| 354 | Bayou Exploration, Inc. | | Oil & Gas Operator | Aug 1989 |
| 355 | Bayou Gas Company Of Monroe La | | Gas Operator | Apr 2009 |
| 356 | Bayou L'Ours Oil & Gas Co. | | Gas Operator | Mar 1988 |
| 357 | Bayou Production Company, Inc. | | Oil & Gas Operator | Apr 1993 |
| 358 | Bayou Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jan 2015 |
| 359 | Bayou Resources, LLC | | Oil & Gas Operator | Dec 2024 |
| 360 | Bayou Sorrel Oil LLC | | Oil & Gas Operator | May 2015 |
| 361 | Bayou South Gas Gather. Co L C | | Oil Operator | Oct 2002 |
| 362 | Bayou State And Caldwell Oil | | Oil Operator | Dec 2024 |
| 363 | Bayou State Oil Corporation | | Oil & Gas Operator | Dec 2024 |
| 364 | Bayshore Exploration LLC | Bellville, TX 77418 | Oil & Gas Operator | Dec 2016 |
| 365 | BBH Operating Company | | Oil & Gas Operator | Feb 1986 |
| 366 | BCF Operating, LLC | | Oil & Gas Operator | Nov 2024 |
| 367 | BCF Resources, LLC | | Oil Operator | Jun 2023 |
| 368 | BCM Energy Louisiana LLC | | Oil Operator | May 2014 |
| 369 | BCM Energy Operating LLC | Lafayette, LA 70503 | Oil Operator | Jun 2015 |
| 370 | Beach-Hollenshead TSTG & SVCS Inc. | | Oil Operator | Jan 2004 |
| 371 | Beacon Petroleum Corporation | | Oil & Gas Operator | Jan 1992 |
| 372 | Bean Energy, Inc. | | Oil & Gas Operator | Dec 1986 |
| 373 | Bean Resources, Inc. | | Oil & Gas Operator | Aug 2006 |
| 374 | Bear Creek Env. Systems, LLC | | Oil Operator | Dec 2008 |
| 375 | Bear Creek Services, LLC | | Oil Operator | Dec 2024 |
| 376 | Bear Minerals LLC | Dallas, TX 75214 | Oil Operator | Jan 2025 |
| 377 | Beard And Ganey | | Oil & Gas Operator | Oct 1986 |
| 378 | Beard Oil Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2013 |
| 379 | Beau Coup Oil& Gas Corporation | | Oil & Gas Operator | Feb 1986 |
| 380 | Beauregard Production Co Inc | | Oil Operator | Dec 2014 |
| 381 | Beavers' Production | | Oil Operator | May 1997 |
| 382 | Bech Oil & Gas, Inc. | | Oil & Gas Operator | Mar 1994 |
| 383 | Bechtel Energy PTNR LTD PRTNRS | | Oil & Gas Operator | Jan 1996 |
| 384 | Bechtel Energy Resources Corp. | Houston, TX 77210 | Oil & Gas Operator | Jun 1996 |
| 385 | Beck Oil Company | | Oil Operator | Sep 1996 |
| 386 | Beck Oil Inc | | Oil & Gas Operator | Jan 2025 |
| 387 | Beebe And Beebe | | Oil & Gas Operator | Jun 2000 |
| 388 | Beem Oil & Gas Company | | Oil & Gas Operator | Dec 1994 |
| 389 | Bel Oil Corporation | Jenks, OK 74037 | Oil & Gas Operator | Jun 2005 |
| 390 | Bel Oil Corporation, Etal | | Oil & Gas Operator | May 1987 |
| 391 | Belco Development Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Feb 1994 |
| 392 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 393 | Belco Operating Corp. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 394 | Belco Petroleum Corp | Grand Junction, CO | Oil & Gas Operator | Dec 1983 |
| 395 | Belden & Blake Corporation | North Canton, OH 44720-0500-0500 | Oil & Gas Operator | Dec 2016 |
| 396 | Belle Exploration, Inc. | | Oil & Gas Operator | Jun 2021 |
| 397 | Belle Oil, Inc. | | Oil & Gas Operator | Mar 2025 |
| 398 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 399 | Belnorth Petroleum Corporation | Midland, TX 79701 | Oil & Gas Operator | Feb 1991 |
| 400 | Ben Carroll | | Oil Operator | Dec 1985 |