| 501 | Laymon Oil Company | | Oil Operator | Feb 2001 |
| 502 | Laymon Oil II, LLC | Neosho Falls, KS 66758 | Oil Operator | Dec 2024 |
| 503 | Laymon, Michael | Yates Center, KS 66783 | Oil Operator | Oct 2024 |
| 504 | Layne Energy Operating, LLC | Kansas City, KS 66106 | Oil & Gas Operator | Dec 2024 |
| 505 | Layton Energy Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2025 |
| 506 | Layton Enterprises, Inc. | Lubbock, TX 79423 | Oil & Gas Operator | Apr 2007 |
| 507 | Layton Glenn F J | | Oil Operator | Mar 1986 |
| 508 | Layton Oil Co. | | Oil Operator | Feb 1994 |
| 509 | Layton Oil Compa | | Oil & Gas Operator | Jul 1985 |
| 510 | Lazarus Operating, LLC | Kilgore, TX 75663 | Oil Operator | Apr 2025 |
| 511 | Lazer Petroleum | | Oil Operator | Jan 1993 |
| 512 | Lazy H Investment | Chandler, OK 74834 | Oil & Gas Operator | Nov 1993 |
| 513 | LBJ Drilling Co Inc | Martinsburg, OH 43037 | Oil & Gas Operator | Dec 2023 |
| 514 | LBJ Energy Associates, LLC | Staunton,, VA 24402 | Oil & Gas Operator | Dec 2021 |
| 515 | LBJ Production Inc | Okmulgee, OK 74447 | Oil Operator | Nov 1998 |
| 516 | LBN Oil Co., Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | May 1998 |
| 517 | Lbo Energy, Inc. | Kentfield, CA 94914 | Gas Operator | Nov 2002 |
| 518 | Lbo New Mexico Inc | Midland, TX BAD ADDR | Oil & Gas Operator | Dec 1996 |
| 519 | Lboc, LLC | Norphlet, AR 71759 | Oil Operator | Dec 2024 |
| 520 | LBTH Inc. | | Oil & Gas Operator | Dec 2024 |
| 521 | LC Operating, LLC | Burkburnett, TX 76354 | Oil & Gas Operator | Apr 2025 |
| 522 | LCB Resources LLC | Kingfisher, OK 73750-2322 | Oil & Gas Operator | Feb 2025 |
| 523 | LCT Energy, LP | Lewisville, AR 71845 | Oil & Gas Operator | Apr 2025 |
| 524 | LCX Energy, LLC | Midland, TX 79701 | Oil & Gas Operator | Jan 2010 |
| 525 | LDD Energy LLC | | Oil & Gas Operator | Dec 2024 |
| 526 | LDF Energy, LLC | Midland, TX 79707 | Oil & Gas Operator | Apr 2025 |
| 527 | LDH Operating LLC | Wichita, KS 67278 | Oil Operator | Dec 2024 |
| 528 | Ldo LLC | Tulsa, OK 74137-3020 | Oil Operator | Feb 2025 |
| 529 | LDX Operating Company, LLC. | Amarillo, TX 79102 | Oil & Gas Operator | Apr 2025 |
| 530 | Le Bas Operating Company, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Mar 2000 |
| 531 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 532 | Le Norman Operating LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2019 |
| 533 | Le Norman Partners LLC | Duncan, OK 73533-9523 | Oil & Gas Operator | Feb 2012 |
| 534 | Le Roy Central School | Le Roy, NY 14482 | Gas Operator | Dec 2023 |
| 535 | Lea Exploration, Inc. | | Oil & Gas Operator | Nov 1989 |
| 536 | Leach Joseph L | Gallipolis, OH 45631 | Oil & Gas Operator | Dec 2023 |
| 537 | Leach, D.L.,Jr. | Edna, TX 77957 | Gas Operator | Oct 2007 |
| 538 | Leach, Elwood | Osawatomie, KS 66064 | Oil Operator | Dec 2009 |
| 539 | Leaco Operating, LLC | Houston, TX 77056 | Oil Operator | Feb 2025 |
| 540 | Leader Equities Inc | Columbus, OH 43214 | Oil & Gas Operator | Dec 1988 |
| 541 | Leading Edge Energy LLC | San Antonio, TX 78205 | Oil Operator | Apr 2025 |
| 542 | Leads Resources, L.L.C. | | Oil & Gas Operator | Jan 2017 |
| 543 | Leahy Oil, LLC | Arlington, TX 76006 | Oil Operator | Apr 2025 |
| 544 | Leake Keith D | Winfield, KS 67156-8871 | Oil Operator | Apr 2004 |
| 545 | Leake, Keith D.(Deceased) Estate | Derby, KS 67037 | Oil Operator | Mar 2003 |
| 546 | Leali & Leali Oil Inc | Hermitage, PA 16148-9020 | Oil & Gas Operator | Dec 2016 |
| 547 | Leaman Oil Company | Roland, OK 74954 | Oil & Gas Operator | Apr 2014 |
| 548 | Lear Gas Transmission | | Oil Operator | Aug 1989 |
| 549 | Lear Oil, LLC | Junction City, KY 40440 | Oil Operator | Dec 2023 |
| 550 | Lear Petroleum Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2015 |
| 551 | Lear Petroleum E | | Oil & Gas Operator | Jan 1986 |
| 552 | Lear Petroleum Exploration | | Oil & Gas Operator | Jul 2013 |
| 553 | Lear Petroleum Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 554 | Learning Disabilities Association Of Wny | Buffalo, NY 14214 | Gas Operator | Dec 2023 |
| 555 | Lease Holders Acquisitions LLC | Yukon, OK 73099 | Gas Operator | Apr 2025 |
| 556 | Lease Management Inc | | Oil & Gas Operator | Sep 2024 |
| 557 | Lease Management Inc And McClure Oil Co | | Oil & Gas Operator | Apr 1991 |
| 558 | Lease Management Inc And Patrick Petroleum Corp | | Oil & Gas Operator | Apr 1991 |
| 559 | Leasehold Management Corp | Oklahoma City, OK 73170 | Oil & Gas Operator | Nov 2024 |
| 560 | Leasing & Develo | | Oil & Gas Operator | Feb 1993 |
| 561 | Leasing & Development, Inc. | Wichita, KS 67202 | Oil Operator | Jun 2022 |
| 562 | Leatherman Creek, Inc. | | Oil Operator | Jul 2001 |
| 563 | Leatherneck Energy Group Inc | Addison, TX 75001-6025 | Oil & Gas Operator | Apr 2020 |
| 564 | Leatherwood, LLC | Canonsburg, PA 15317-6506 | Oil & Gas Operator | Dec 2023 |
| 565 | Leavell Resource | | Oil Operator | Dec 1993 |
| 566 | Leavell Resources Corporation | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 567 | Leben Corp. | Wichita, KS 67202 | Oil & Gas Operator | Dec 2011 |
| 568 | Leben Drilling I | | Oil & Gas Operator | Dec 1988 |
| 569 | Leben Oil Corpor | | Oil & Gas Operator | Apr 1991 |
| 570 | Leben Theodore I | | Oil & Gas Operator | Dec 1995 |
| 571 | Leben* Theodore I Dba Leben Oil Companies | | Oil Operator | Jun 2002 |
| 572 | Leboeuf MFG Inc | Waterford, PA 16441-0458 | Gas Operator | Dec 1990 |
| 573 | Lebosquet Gas Operations, LLC | Wichita, KS 67202 | Gas Operator | Dec 2024 |
| 574 | Lebosquet John R | | Gas Operator | Dec 1994 |
| 575 | Lebosquet, John W. | Wichita, KS 67202 | Gas Operator | Dec 2024 |
| 576 | Lebow, Marvin E. | Tulsa, OK 74135 | Oil & Gas Operator | Jun 1997 |
| 577 | Lebsack Oil Prod | | Oil & Gas Operator | Nov 1995 |
| 578 | Lebsack Oil Production Inc. | Stafford, KS 67578 | Oil & Gas Operator | Dec 2024 |
| 579 | Lebsack, James S. | Denver, CO 80222 | Oil Operator | Sep 1998 |
| 580 | Lebus Oilfield Service Co | | Oil Operator | Sep 2009 |
| 581 | Leclair Operating Co., Inc. | Abilene, TX 79602 | Oil & Gas Operator | Apr 2025 |
| 582 | Leclair Operating, L.L.C. | Abilene, TX 79602 | Oil & Gas Operator | Apr 2025 |
| 583 | Leclair-Westwood Inc | | Oil & Gas Operator | Mar 1982 |
| 584 | Led Enterprises | El Dorado, KS 67042 | Oil Operator | Sep 1999 |
| 585 | Led Enterprises LLC | El Dorado, KS 67042 | Oil Operator | Dec 2009 |
| 586 | Ledbetter, Jerald D. Estate Of | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2025 |
| 587 | Ledbetter, Jerald D. Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | Jan 2007 |
| 588 | Ledbetter, Morris | Abilene, TX 79605 | Oil & Gas Operator | Jun 2005 |
| 589 | Ledbetter, O. H. | Albany, TX 76430 | Oil & Gas Operator | Mar 1997 |
| 590 | Ledford Jan Oil & Gas | Duncan, OK 73533-3210 | Oil Operator | Dec 2024 |
| 591 | Ledger Operating Corporation | Abilene, TX 79601 | Oil Operator | Apr 2025 |
| 592 | Lee And Jane Laird | | Oil & Gas Operator | Dec 2002 |
| 593 | Lee Brothers Oil Co. | Houston, TX 77056 | Oil & Gas Operator | Mar 2008 |
| 594 | Lee Donna Oil Co | | Oil & Gas Operator | Dec 1996 |
| 595 | Lee E & M Lee Minter | New Kensington, PA 15068-1440 | Gas Operator | Dec 2003 |
| 596 | Lee Energy Exploration LTD | Oklahoma City, OK 73102-7114 | Oil & Gas Operator | Jul 2008 |
| 597 | Lee Energy LLC | Edmond, OK 73034-7668 | Oil Operator | Jan 2005 |
| 598 | Lee Jr W E | Beggs, OK 74421-2683 | Oil & Gas Operator | May 2013 |
| 599 | Lee Lamberson Inc. | | Oil & Gas Operator | Dec 2000 |
| 600 | Lee Lynn MGMT Co | Indiana, PA 15701-3400 | Oil & Gas Operator | Dec 1991 |