| 401 | Billfisch Exploration Co., Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Oct 1997 |
| 402 | Billington Oil & Gas, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 403 | Bills, L. T. | Snyder, TX 79549 | Oil & Gas Operator | Oct 2025 |
| 404 | Bilmac Oil Co., Inc. | Abilene, TX 79601 | Oil & Gas Operator | Oct 2025 |
| 405 | Bingham'S Oil & Gas | Midland, TX 79708 | Oil & Gas Operator | Jan 2002 |
| 406 | Birch Operations, Inc. | Houston, TX 77010 | Oil & Gas Operator | Oct 2025 |
| 407 | Bird Creek Resources Inc | Tulsa, OK 74121 | Oil & Gas Operator | Jul 2022 |
| 408 | Bird E&P LLC | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 409 | Bird, Charles A. | Midland, TX 79701 | Oil & Gas Operator | Feb 2012 |
| 410 | Birdwell Oil & Gas, L.L.C. | Bryson, TX 76427 | Oil & Gas Operator | Oct 2025 |
| 411 | Birdwell, C. E. | Bryson, TX 76427 | Oil & Gas Operator | Dec 2001 |
| 412 | Birdwell, Mike Oil Co. | Holliday, TX 76366 | Oil & Gas Operator | Jun 2012 |
| 413 | Birge Oil Co. | Wichita Falls, TX 76302 | Oil & Gas Operator | Jun 1995 |
| 414 | Bishop Petroleum Inc. | Houston, TX 77007 | Oil & Gas Operator | Oct 2025 |
| 415 | Bishop, D. L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2012 |
| 416 | Bishop, E.J. | Winters, TX 79567 | Oil & Gas Operator | May 1997 |
| 417 | Bishop, J. E., Inc. | Houston, TX 77024 | Oil & Gas Operator | Jul 2012 |
| 418 | Bison Energy Partners, Inc. | Houston, TX 77060 | Oil & Gas Operator | Sep 2001 |
| 419 | Bison Energy Partners, LTD. | Houston, TX 77060 | Oil & Gas Operator | Apr 2002 |
| 420 | Bison Petroleum Corporation | Amarillo, TX 79121 | Oil & Gas Operator | Mar 1996 |
| 421 | Bissell Operating LLC | San Antonio, TX 78216 | Oil Operator | Oct 2016 |
| 422 | Bitter Creek LLC | Graham, TX 76450 | Oil Operator | Oct 2025 |
| 423 | Bitter Creek Petroleum Co. | Knox City, TX 79529 | Oil & Gas Operator | Oct 2025 |
| 424 | Bitz, M. J. Company | Fort Worth, TX 76116 | Oil & Gas Operator | Aug 2003 |
| 425 | Bivins, Orville J. Jr. | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2004 |
| 426 | BJ Operating, Inc. | Menard, TX 76859 | Oil & Gas Operator | Oct 2025 |
| 427 | BJG Operating Company | Midland, TX 79702 | Oil Operator | Oct 2025 |
| 428 | BKJ Oil, LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 429 | BKM Production | Gainesville, TX 76240 | Oil & Gas Operator | Oct 2025 |
| 430 | BKN Oil & Gas, Inc. | Port Lavaca, TX 77979 | Gas Operator | Aug 1997 |
| 431 | BKV Barnett, LLC | Fort Worth, TX 76106 | Oil & Gas Operator | Oct 2025 |
| 432 | BKV North Texas, LLC | Fort Worth, TX 76106 | Oil & Gas Operator | Oct 2025 |
| 433 | BL Production, LLC | Abilene, TX 79606 | Oil Operator | Oct 2025 |
| 434 | Black Arrow Operating, LLC | Dennis, TX 76439 | Oil & Gas Operator | Oct 2025 |
| 435 | Black Bandana LLC | Santo, TX 76472 | Oil & Gas Operator | Oct 2025 |
| 436 | Black Bayou Operating, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2025 |
| 437 | Black Bear Oil Corporation | Las Vegas, NV 89128 | Oil & Gas Operator | Aug 2025 |
| 438 | Black Belt Operating, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 439 | Black Creek Oil Company, LLC | Yancey, TX 78886 | Oil Operator | Oct 2025 |
| 440 | Black Creek Production Co., Inc. | Driftwood, TX 78619 | Oil & Gas Operator | Feb 2000 |
| 441 | Black Diamond Operating Co., LLC | Kilgore, TX 75662 | Oil & Gas Operator | Sep 2009 |
| 442 | Black Dome Energy Corporation | Golden, CO 80401 | Oil & Gas Operator | Dec 2019 |
| 443 | Black Draw Energy LLC | Cypress, TX 77433 | Oil & Gas Operator | Oct 2025 |
| 444 | Black Elk Energy Offshore Op LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2025 |
| 445 | Black Gold Energy LLC | Jenks, OK 74037 | Oil Operator | Jun 2024 |
| 446 | Black Gold Operating Co, LLC | Plntersville, TX 77363 | Oil & Gas Operator | Oct 2025 |
| 447 | Black Gold Petroleum, LLC | Alice, TX 78333 | Oil Operator | Oct 2025 |
| 448 | Black Gold Properties | Lubbock, TX 79424 | Oil & Gas Operator | Feb 1999 |
| 449 | Black Gold Resources LLC | Houston, TX 77056 | Oil Operator | Sep 2013 |
| 450 | Black Gold Well Service | San Angelo, TX 76901 | Oil & Gas Operator | Oct 2025 |
| 451 | Black Horse Resources, LLC | Oklahoma City, OK 73112 | Oil & Gas Operator | Sep 2024 |
| 452 | Black Jack Oil Co Inc | Holliday, TX 76366 | Oil & Gas Operator | Jun 2025 |
| 453 | Black Jack Services, L.L.C. | Bastrop, TX 78602 | Oil & Gas Operator | Oct 2025 |
| 454 | Black Jack Well Service, Inc. | Somerset, TX 78069 | Oil & Gas Operator | Aug 2003 |
| 455 | Black Mountain Oil & Gas II LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2021 |
| 456 | Black Mountain Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 457 | Black Mountain STX I LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 458 | Black Mountain SWD LP | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 459 | Black Oil Company, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 460 | Black Pearl Exploration, L.L.C. | Houston, TX 77095 | Oil & Gas Operator | May 2015 |
| 461 | Black Pearl Operating Comp., LLC | Houston, TX 77057 | Oil Operator | Oct 2025 |
| 462 | Black Pool Energy, LP | Houston, TX 77070 | Oil & Gas Operator | Jul 2024 |
| 463 | Black Resources | Borger, TX 79008 | Oil & Gas Operator | Oct 2025 |
| 464 | Black Resources, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Mar 2008 |
| 465 | Black River Operating LLC | Keller, TX 76248 | Oil & Gas Operator | Oct 2025 |
| 466 | Black Rock Resources, LLC | Russell, KS 67665 | Oil Operator | Jun 2025 |
| 467 | Black Sable Energy, LLC | San Antonio, TX 78209 | Oil Operator | Jan 2018 |
| 468 | Black Sheep Oil & Gas LLC | Odessa, TX 79768 | Oil & Gas Operator | Oct 2025 |
| 469 | Black Sheep Operating, LLC | Amarillo, TX 79109 | Oil & Gas Operator | Oct 2025 |
| 470 | Black Star Oil Company | Plano, TX 75094 | Oil & Gas Operator | Oct 2025 |
| 471 | Black Stone Energy Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2004 |
| 472 | Black Stone Energy Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 473 | Black Stone Oil Company | Dallas, TX 75244 | Oil & Gas Operator | Feb 1997 |
| 474 | Black Strata LLC | Weatherford, TX 76086 | Oil Operator | Oct 2025 |
| 475 | Black Swan Opco, LLC | Edmond, OK 73013 | Oil & Gas Operator | Oct 2025 |
| 476 | Black Swan Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2023 |
| 477 | Black Top Operating, LLC | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 478 | Black Water Environmental L.L.C. | Texas City, TX 77590 | Oil Operator | Oct 2025 |
| 479 | Black'S Oil & Gas | Borger, TX 79008 | Oil & Gas Operator | Oct 2025 |
| 480 | Black, Karl T. | Paradise, TX 76073 | Oil & Gas Operator | Aug 2003 |
| 481 | Blackbeard Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Oct 2025 |
| 482 | Blackbird R 22 Og L.L.C. | Eastland, TX 76448 | Gas Operator | Oct 2025 |
| 483 | Blackbrush O & G, Inc. | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2012 |
| 484 | Blackbrush O & G, LLC | San Antonio, TX 78259 | Oil & Gas Operator | Oct 2025 |
| 485 | Blackflat Oil Company LLC | Lubbock, TX 79424 | Oil Operator | Oct 2025 |
| 486 | Blackjack Oil & Gas, Inc. | Hennessey, OK 73742 | Oil & Gas Operator | Oct 2025 |
| 487 | Blackjack Operating L. L. C. | Cibolo, TX 78108 | Oil & Gas Operator | Oct 2025 |
| 488 | Blackland Oil & Gas | Portland, TX 78374 | Oil & Gas Operator | Aug 1997 |
| 489 | Blackmar, Jim Oil Operator | Luling, TX 78648 | Oil & Gas Operator | Jan 2021 |
| 490 | Blackmun Family Partners, L.P. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2025 |
| 491 | Blackrock Drilling, LLC | Abilene, TX 79606 | Oil Operator | Oct 2025 |
| 492 | Blackrock Energy LLC | Wagoner, OK 74467 | Oil Operator | Apr 2025 |
| 493 | Blackrock Operating, LLC | Tuscola, TX 79562 | Oil & Gas Operator | Oct 2025 |
| 494 | Blackshear, Charley | Winters, TX 79567 | Oil & Gas Operator | Oct 1998 |
| 495 | Blackstone Energy Services LLC | Christoval, TX 76935 | Oil & Gas Operator | Oct 2025 |
| 496 | Blackwater Oil & Gas Corporation | Colleyville, TX 76034 | Oil & Gas Operator | May 2018 |
| 497 | Blackwelder Oil | MC Camey, TX 79752 | Oil Operator | Oct 2025 |
| 498 | Blackwell BMC, LLC | Dallas, TX 75204 | Oil & Gas Operator | Jan 2022 |
| 499 | Blackwell BMC, LP | Dallas, TX 75252 | Oil & Gas Operator | Mar 2007 |
| 500 | Blackwell Drilling Co. | Cameron, TX 76520 | Oil & Gas Operator | Nov 2004 |