| 401 | Barnes Exploration Co. | Nashville, TN 37209 | Oil & Gas Operator | Feb 1995 |
| 402 | Barnes Hugoton C | | Gas Operator | Oct 1993 |
| 403 | Barnes Mineral Production, LTD. | Hallettsville, TX 77964 | Oil & Gas Operator | Jun 2025 |
| 404 | Barnes Oil & Gas LLC | Nashville, TN 37221 | Oil & Gas Operator | Jun 2017 |
| 405 | Barnes Oil & Gas, Inc. | | Gas Operator | Jun 1991 |
| 406 | Barnes Producing Company LLC | Ardmore, OK 73401-8882 | Oil Operator | Feb 2025 |
| 407 | Barnes Resources | Kane, PA 16735-0441 | Oil & Gas Operator | Dec 2015 |
| 408 | Barnes, Cordell W. | Caney, KS 67333 | Oil Operator | Dec 1986 |
| 409 | Barnes, Jerry B. | Gainesville, TX 76241 | Oil & Gas Operator | Oct 2006 |
| 410 | Barnes, K. A. | Somerset, TX 78069 | Oil & Gas Operator | Jan 2013 |
| 411 | Barnes, L.- Oil Company | | Oil Operator | Jan 2014 |
| 412 | Barnes, Larry Petroleum, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Jul 1996 |
| 413 | Barnett Darrell | Bristow, OK 74010-4926 | Oil Operator | Jan 2019 |
| 414 | Barnett Drilling & Production | | Gas Operator | Oct 1986 |
| 415 | Barnett Energy, Inc. | The Colony, TX 75056 | Oil & Gas Operator | Jun 2025 |
| 416 | Barnett James E | Skiatook, OK 74070-0100 | Oil & Gas Operator | May 2013 |
| 417 | Barnett John | Skiatook, OK 74070 | Oil & Gas Operator | Jan 2025 |
| 418 | Barnett Oil | | Oil Operator | Oct 2009 |
| 419 | Barnett Oil Co | | Oil & Gas Operator | Dec 2009 |
| 420 | Barnett Oil Investments, Inc. | Hobbs, NM 88240 | Oil & Gas Operator | Mar 1999 |
| 421 | Barnett Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 1999 |
| 422 | Barnett Serio | | Gas Operator | Oct 1992 |
| 423 | Barnett Serio Exploration Co | | Oil & Gas Operator | Oct 1992 |
| 424 | Barnett, G. | Graham, TX 76450 | Oil Operator | Jun 2025 |
| 425 | Barnette & Sons, Inc | Dubach, LA 71235 | Oil & Gas Operator | Mar 2011 |
| 426 | Barney, Constance S. & Wallace Barney | Andover, NY 14806 | Oil & Gas Operator | Dec 2023 |
| 427 | Barney, Douglas F. & Kelly J. | Wellsville, NY 14895 | Gas Operator | Dec 2023 |
| 428 | Barnhart Co LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2025 |
| 429 | Barnhart Co. | Houston, TX 77056 | Oil & Gas Operator | Jun 2025 |
| 430 | Barnhill, Monte | Muenster, TX 76252 | Oil Operator | Jun 2025 |
| 431 | Barnosky, Ronald | Hermosa, SD 57744 | Gas Operator | Dec 2021 |
| 432 | Barnwell Oil Company, Inc. | | Oil & Gas Operator | Sep 1991 |
| 433 | Barnwell Petroleum Corp. | | Oil & Gas Operator | Sep 1978 |
| 434 | Baron Crest Energy Co | Apollo, PA 15613-8912 | Oil & Gas Operator | Dec 2007 |
| 435 | Baron Energy Inc. | San Marcos, TX 78666 | Oil & Gas Operator | Jun 2025 |
| 436 | Baron Energy LTD. | Midland, TX 79702 | Oil & Gas Operator | Oct 2005 |
| 437 | Baron Exploration Company | Edmond, OK 73034 | Oil & Gas Operator | Jun 2025 |
| 438 | Baron Group Inc | Indianola, PA 15051-0563 | Oil & Gas Operator | Dec 2020 |
| 439 | Barr Energy LLC | | Oil Operator | Jun 2010 |
| 440 | Barr, David E & Garnet M | Grantsville, WV 26147-9862 | Oil & Gas Operator | Dec 2021 |
| 441 | Barracuda Operating Company | Ness City, KS 67560 | Oil Operator | Jan 2025 |
| 442 | Barrel Springs Development Corp | Denver, CO 80202 | Oil & Gas Operator | Oct 1986 |
| 443 | Barrett Brothers Oil & Gas, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2020 |
| 444 | Barrett Brothers Oil And Gas | San Antonio, TX 78217 | Oil & Gas Operator | Mar 1995 |
| 445 | Barrett Corporation* Bill | | Oil & Gas Operator | Mar 2025 |
| 446 | Barrett Drilling Company | Shawnee, OK 74802-1345 | Oil & Gas Operator | Jun 2013 |
| 447 | Barrett Oil & Gas Inc | Albany, KY 42602 | Oil & Gas Operator | Dec 2023 |
| 448 | Barrett Oil Co. | White Oak, TX 75693 | Oil & Gas Operator | Dec 2023 |
| 449 | Barrett Patrick | | Oil & Gas Operator | Apr 1988 |
| 450 | Barrett Resources Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 451 | Barrier Resources,L.L.C. | Cedar Park, TX 78613 | Oil & Gas Operator | Aug 2003 |
| 452 | Barron Kidd-Great American Exploration | | Oil Operator | Dec 1968 |
| 453 | Barron Operating LLC | Midland, TX 79703 | Oil & Gas Operator | Jun 2011 |
| 454 | Barron Petroleum LLC | San Antonio, TX 78205 | Oil & Gas Operator | Jun 2025 |
| 455 | Barron Utilities, Inc. | | Oil Operator | Jun 1999 |
| 456 | Barrow Petroleum LLC | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 457 | Barrow-Shaver Resources Co. | Tyler, TX 75703 | Oil & Gas Operator | Jun 2025 |
| 458 | Barry & Campbell | | Oil & Gas Operator | Apr 1981 |
| 459 | Barry D Lee Dba Barry Lee Investments | Crossroads, NM 88114 | Oil & Gas Operator | Jan 2022 |
| 460 | Barry Rock Oil Co. Inc. | Plain Dealing, LA 71064 | Oil & Gas Operator | Dec 2024 |
| 461 | Barta Enterprises | Oklahoma City, OK 73162-1728 | Oil & Gas Operator | Feb 2025 |
| 462 | Bartex Energy Corporation | Irving, TX 75060 | Oil & Gas Operator | Apr 1994 |
| 463 | Bartlett Brenda S & Bartlett Norman C | North East, PA 16428-5547 | Gas Operator | Dec 2024 |
| 464 | Bartlett, Donald & Janice | South Dayton, NY 14138 | Gas Operator | Dec 2023 |
| 465 | Bartlett, Roy, G. | Harrisville, WV 26362 | Oil & Gas Operator | Dec 2021 |
| 466 | Bartlett, W. C. | | Oil & Gas Operator | Dec 2021 |
| 467 | Bartley Oil & Gas Co LLC | Emlenton, PA 16373 | Oil Operator | Dec 2024 |
| 468 | Bartling Oil Com | | Gas Operator | Dec 1992 |
| 469 | Bartling Oil Company | Austin, TX 78733 | Gas Operator | Jun 2017 |
| 470 | Barto Oil Co. | | Oil & Gas Operator | Dec 1992 |
| 471 | Barton Edward Lee | Mounds, OK 74047-4177 | Oil Operator | Feb 2025 |
| 472 | Barton Exploration, Inc. | Hays, KS 67601 | Oil & Gas Operator | Feb 2025 |
| 473 | Barton Oil & Gas Co., Inc. | | Oil & Gas Operator | Sep 1993 |
| 474 | Barton Oil Co. | Baird, TX 79504 | Oil Operator | Jun 2004 |
| 475 | Barton Oil Compa | | Oil Operator | Jan 1986 |
| 476 | Barton Oil, LLC | | Oil & Gas Operator | Jan 2014 |
| 477 | Barton, Athol Oil , Inc. | Russell, KS 67665 | Oil Operator | Jul 2001 |
| 478 | Barton, Howard | Archer City, TX 76351 | Gas Operator | Jun 2025 |
| 479 | Bartram, I David | Lavalette, WV 25535 | Oil & Gas Operator | Dec 2020 |
| 480 | Barts Oilfield Servi | | Oil Operator | Feb 2025 |
| 481 | Baruch-Foster Co | | Oil Operator | Apr 1989 |
| 482 | Baruch-Foster Corporation | Oklahoma City, OK 73126-6770 | Oil & Gas Operator | Feb 2001 |
| 483 | Bas Production, LLC | | Oil Operator | Nov 2019 |
| 484 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | Jun 2025 |
| 485 | Basal Corporation | Cleburne, TX 76033 | Oil & Gas Operator | Jun 2025 |
| 486 | Base Petroleum | Houston, TX 77096 | Oil & Gas Operator | Jul 1994 |
| 487 | Base Petroleum, Inc. | South Charleston, WV 25309-0000 | Oil & Gas Operator | Dec 2021 |
| 488 | Baseline Oil & Gas Corp. | Houston, TX 77267 | Oil & Gas Operator | Oct 2010 |
| 489 | Basf Corporation | Houston, TX 77027 | Oil & Gas Operator | Nov 1992 |
| 490 | Basgall Oil LLC | Hays, KS 67601 | Oil Operator | Feb 2025 |
| 491 | Basic Earth Science Sys, Inc | | Oil Operator | May 1987 |
| 492 | Basic Earth Science Systems, Inc. | Austin, TX 78714 | Oil & Gas Operator | Apr 2010 |
| 493 | Basic Energy & Affil Res. Inc. | | Oil & Gas Operator | May 2000 |
| 494 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | Jun 2025 |
| 495 | Basin Energy, Inc | | Oil Operator | Dec 2017 |
| 496 | Basin Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 497 | Basin Fuels LTD | Farmington, NM 87499 | Oil & Gas Operator | Sep 1996 |
| 498 | Basin Minerals Inc | Farmington, NM 87402 | Oil & Gas Operator | Mar 2005 |
| 499 | Basin Minerals LTD | Farmington, NM 87402 | Oil & Gas Operator | Feb 2005 |
| 500 | Basin Minerals Operating Company | Dripping Springs, TX 78620 | Oil & Gas Operator | Oct 2017 |