| 501 | Basin Energy, Inc | | Oil Operator | Dec 2017 |
| 502 | Basin Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 503 | Basin Fuels LTD | Farmington, NM 87499 | Oil & Gas Operator | Sep 1996 |
| 504 | Basin Minerals Inc | Farmington, NM 87402 | Oil & Gas Operator | Mar 2005 |
| 505 | Basin Minerals LTD | Farmington, NM 87402 | Oil & Gas Operator | Feb 2005 |
| 506 | Basin Minerals Operating Company | Dripping Springs, TX 78620 | Oil & Gas Operator | Oct 2017 |
| 507 | Basin Oil & Gas Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2025 |
| 508 | Basin Operating Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2025 |
| 509 | Basin Operating Services II LLC | Oklahoma City, OK 73106-5615 | Oil & Gas Operator | Feb 2025 |
| 510 | Basin Operating Services LLC | Oklahoma City, OK 73106-5615 | Oil & Gas Operator | Jan 2025 |
| 511 | Basin Petroleum, Inc. | | Oil & Gas Operator | Jul 1995 |
| 512 | Basin Petroleum, LLC | | Oil Operator | Dec 2017 |
| 513 | Basin Resources Corporation | Fair Oaks Ranch, TX 78015 | Oil Operator | May 2013 |
| 514 | Basin Well Service Of Odessa,Inc | Odessa, TX 79768 | Oil & Gas Operator | Apr 2025 |
| 515 | Basinski, Gerald S. | Lancaster, NY 14086 | Gas Operator | Dec 2023 |
| 516 | Basis Resources Group LLC | Oklahoma, OK 73116-1516 | Oil & Gas Operator | Jan 2025 |
| 517 | Bass Energy Co Inc | Richfield, OH 44286 | Oil & Gas Operator | Dec 2023 |
| 518 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 519 | Bass Operating Co., Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 1999 |
| 520 | Bass Petroleum | Austin, TX 78720 | Oil & Gas Operator | Aug 2004 |
| 521 | Bass Petroleum Inc | Austin, TX 78716 | Oil & Gas Operator | Apr 2025 |
| 522 | Bass-Franks | | Oil & Gas Operator | Jun 1997 |
| 523 | Bastrop Energy Group | San Antonio, TX 78231 | Oil & Gas Operator | Apr 2025 |
| 524 | Bataa Oil Inc | Greeley, CO 80634 | Oil & Gas Operator | Feb 2025 |
| 525 | Batco Oil Company | Edmond, OK 73083 | Oil & Gas Operator | Feb 2002 |
| 526 | Bateman Frank | Lancaster, OH 43130 | Oil & Gas Operator | Dec 1995 |
| 527 | Bateman'S Bay Exploration, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Jan 2025 |
| 528 | Bates Creek Oil | | Oil Operator | Dec 1986 |
| 529 | Bates Lew Jr | Lewis Center, OH 43035-261-261 | Oil & Gas Operator | Dec 2002 |
| 530 | Bates Oil | | Oil Operator | Feb 2020 |
| 531 | Bates Oil & Gas Inc | Worthington, OH 43085 | Oil & Gas Operator | Dec 1992 |
| 532 | Bates R P | | Gas Operator | Nov 2000 |
| 533 | Bates* James Edward | | Oil & Gas Operator | Jul 2017 |
| 534 | Bateson Donald Jr | | Oil Operator | Dec 2023 |
| 535 | Batie, Patricia | Odessa, TX 79764 | Oil Operator | Nov 2024 |
| 536 | Batista Mark F | Kane, PA 16735 | Oil Operator | Dec 2024 |
| 537 | Batista Oil SVC | Kane, PA 16735-9003 | Oil Operator | Dec 2008 |
| 538 | Batson Ent Ventures L.L.C. | Batson, TX 77519 | Oil Operator | Apr 2025 |
| 539 | Battle Creek Gas Co | | Gas Operator | Mar 1996 |
| 540 | Battlecat Oil & Gas, LLC | Houston, TX 77082 | Oil & Gas Operator | Jul 2017 |
| 541 | Battlecat Operating Company, LLC | Houston, TX 77082 | Oil & Gas Operator | Jul 2019 |
| 542 | Battles Energy Corporation | Bridgeport, WV 26330 | Oil & Gas Operator | Dec 2021 |
| 543 | Batton Oil & Gas, LLC | Spearman, TX 79081 | Oil & Gas Operator | Apr 2025 |
| 544 | Bauer Bros | | Oil Operator | Feb 2025 |
| 545 | Bauer Oil Investment, LLC | Cleveland, MO 64734 | Oil Operator | Dec 2024 |
| 546 | Bauer, James E. | Wyoming, NY 14591 | Gas Operator | Dec 2023 |
| 547 | Baugh Allan L | Drumright, OK 74030-5914 | Oil & Gas Operator | Feb 2025 |
| 548 | Baulch Enterprises | Ada, OK 74820-8623 | Oil Operator | Dec 1999 |
| 549 | Baumann Resources Inc | | Oil Operator | Jul 1999 |
| 550 | Baxter And Associates Inc | Ada, OK 74820 | Oil & Gas Operator | Jan 2025 |
| 551 | Baxter Casing Pullers, Inc. | Midland, TX 79703 | Gas Operator | Apr 2025 |
| 552 | Baxter Drill. & Explor., Inc. | | Oil Operator | Jun 1997 |
| 553 | Baxter Randall H | Tulsa, OK 74136-0908 | Oil & Gas Operator | Apr 2020 |
| 554 | Baxter, D. B. Inc. | Midland, TX 79708 | Oil & Gas Operator | Apr 2025 |
| 555 | Baxter, Kelly H. | Austin, TX 78767 | Oil & Gas Operator | Mar 2008 |
| 556 | Baxter, Kelly H. Oil And Gas Co. | Austin, TX 78767 | Oil & Gas Operator | Nov 2010 |
| 557 | Baxter, Murphy H. | Houston, TX 77002 | Oil & Gas Operator | Sep 1998 |
| 558 | Bay City Minerals, Inc. | | Gas Operator | May 1990 |
| 559 | Bay Coquille, Inc. | | Oil & Gas Operator | Jun 2023 |
| 560 | Bay Gas, LLC | | Oil & Gas Operator | Feb 2025 |
| 561 | Bay Oaks Resources LLC | Fort Smith, AR 72913-3129 | Gas Operator | Feb 2018 |
| 562 | Bay Petroleum Corporation | Lakewood, FL 34202-2852 | Oil & Gas Operator | Mar 2015 |
| 563 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | Apr 2025 |
| 564 | Bay State Energy (Rob'T P. Evans) | | Oil & Gas Operator | Jul 2002 |
| 565 | Bay Tan Operating, LP | Odessa, TX 79765 | Oil & Gas Operator | Apr 2025 |
| 566 | Bay-Tech Operating Co., Inc. | Tyler, TX 75713 | Oil & Gas Operator | Mar 2024 |
| 567 | Bayer Brokerage Company, Inc. | | Oil & Gas Operator | Dec 2021 |
| 568 | Bayer, Arthur | Muenster, TX 76252 | Oil & Gas Operator | Nov 2016 |
| 569 | Bayer, J.H. & Sons Inc | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2008 |
| 570 | Bayhorse Petroleum LLC | | Oil Operator | Dec 2016 |
| 571 | Bayless Producer LLC* Robert L | | Oil & Gas Operator | Jan 2025 |
| 572 | Bayless, Robert L Producer | Denver, CO 80293 | Oil & Gas Operator | Sep 2003 |
| 573 | Baylor Operating, LLC | Austin, TX 78766 | Oil & Gas Operator | Apr 2025 |
| 574 | Bayonet Petroleum LLC | Moran, KS 66755 | Oil Operator | Dec 2024 |
| 575 | Bayou Bend Petroleum Corporation | Austin, TX 78734 | Oil & Gas Operator | Sep 2006 |
| 576 | Bayou Bouillon Operating LLC | | Oil & Gas Operator | Dec 2024 |
| 577 | Bayou Carencro Oil Co. Inc. | | Oil Operator | Apr 2022 |
| 578 | Bayou Choctaw, Inc. | | Oil & Gas Operator | Jun 2004 |
| 579 | Bayou Company, The | Refugio, TX 78377 | Oil & Gas Operator | Apr 2025 |
| 580 | Bayou Couba Oil Company | | Oil & Gas Operator | May 2002 |
| 581 | Bayou Desiard Corporation | | Gas Operator | Dec 2002 |
| 582 | Bayou Drilling Fluids, Inc. | | Gas Operator | Jul 2020 |
| 583 | Bayou Exploration, Inc. | | Oil & Gas Operator | Aug 1989 |
| 584 | Bayou Gas Company Of Monroe La | | Gas Operator | Apr 2009 |
| 585 | Bayou L'Ours Oil & Gas Co. | | Gas Operator | Mar 1988 |
| 586 | Bayou Oil Co. | Los Angeles, CA 90036 | Gas Operator | Nov 1996 |
| 587 | Bayou Oil LLC | Ardmore, OK 73401-4726 | Oil & Gas Operator | Jan 2025 |
| 588 | Bayou Operating Company, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Apr 2025 |
| 589 | Bayou Production Company, Inc. | | Oil & Gas Operator | Apr 1993 |
| 590 | Bayou Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jan 2015 |
| 591 | Bayou Resources, LLC | | Oil & Gas Operator | Dec 2024 |
| 592 | Bayou Sorrel Oil LLC | | Oil & Gas Operator | May 2015 |
| 593 | Bayou South Gas Gather. Co L C | | Oil Operator | Oct 2002 |
| 594 | Bayou State And Caldwell Oil | | Oil Operator | Dec 2024 |
| 595 | Bayou State Oil Corporation | | Oil & Gas Operator | Dec 2024 |
| 596 | Bayridge Texas Corp. | Big Spring, TX 79720 | Oil & Gas Operator | Jul 2004 |
| 597 | Bays Exploration Inc | Oklahoma City, OK 73116-9004 | Oil & Gas Operator | Jan 2025 |
| 598 | Bayshore Exploration LLC | Bellville, TX 77418 | Oil & Gas Operator | Dec 2016 |
| 599 | Bayshore Operating Co. | Ingleside, TX 78362 | Oil & Gas Operator | Mar 2009 |
| 600 | Bayshore Operating Corp., L.L.C. | Luling, TX 78648 | Oil Operator | Apr 2025 |