| 601 | Leexus Operating Company | Austin, TX 78734 | Oil & Gas Operator | Aug 2007 |
| 602 | Lefco Resources LLC | Henryetta, OK 74437 | Gas Operator | Jun 2026 |
| 603 | Leffel'S, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Jun 2020 |
| 604 | Left Behind Recovery, LLC | Luling, TX 78648 | Oil & Gas Operator | Sep 2026 |
| 605 | Leg Up Operating Company LLC | Tulsa, OK 74135 | Oil Operator | Jun 2026 |
| 606 | Legacy - M & K Corporation | Dallas, TX 75231-0969 | Oil & Gas Operator | Jan 2025 |
| 607 | Legacy Acres, LLC | South Dayton, NY 14138 | Gas Operator | Dec 2025 |
| 608 | Legacy Corporation, The | Cedar Park, TX 78613 | Oil & Gas Operator | Jun 2004 |
| 609 | Legacy Energy Inc | Carpinteria, CA 93013 | Oil & Gas Operator | Jun 2012 |
| 610 | Legacy Energy Services | Jourdanton, TX 78026 | Oil Operator | Sep 2026 |
| 611 | Legacy Energy Services LLC | Stillwater, OK 74074 | Oil & Gas Operator | Jul 2026 |
| 612 | Legacy Energy, LLC | Russell, KS 67665 | Oil Operator | May 2026 |
| 613 | Legacy Exploration, LLC I | Dallas, TX 75201 | Oil & Gas Operator | Sep 2026 |
| 614 | Legacy Ogc LLC | Erie, PA 16509 | Oil & Gas Operator | Dec 2025 |
| 615 | Legacy Oil & Gas ND, Inc. | | Oil & Gas Operator | Feb 2016 |
| 616 | Legacy Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Sep 2026 |
| 617 | Legacy Oklahoma Operators LLC | Shawnee, OK 74804-1447 | Oil & Gas Operator | Jun 2026 |
| 618 | Legacy Operating Company | | Oil & Gas Operator | Aug 1992 |
| 619 | Legacy Operating Company, LLC | Dallas, TX 75205 | Oil Operator | Jun 2024 |
| 620 | Legacy Petroleum Corporation | Dallas, TX 75225 | Oil & Gas Operator | Mar 2019 |
| 621 | Legacy Petroleum LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2026 |
| 622 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Sep 2026 |
| 623 | Legacy Resources Co., L.P. | | Oil & Gas Operator | Apr 2019 |
| 624 | Legado DJ, LLC | | Oil & Gas Operator | Jul 2011 |
| 625 | Legado Gulf Coast, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2010 |
| 626 | Legado Midcon, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2010 |
| 627 | Legado Permian, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2013 |
| 628 | Legend Energy Corporation | Stillwater, OK 74074-1721 | Oil & Gas Operator | Aug 2022 |
| 629 | Legend Energy LLC | Cherryvale, KS 67335 | Oil Operator | Apr 2026 |
| 630 | Legend Energy Texas, LLC | Corpus Christ, TX 78401 | Oil & Gas Operator | Sep 2026 |
| 631 | Legend Fund, LLC | | Oil & Gas Operator | Jan 2025 |
| 632 | Legend Natural Gas II, LP | Houston, TX 77094 | Oil & Gas Operator | Feb 2015 |
| 633 | Legend Natural Gas III, LP | Houston, TX 77094 | Oil & Gas Operator | Feb 2015 |
| 634 | Legend Natural Gas IV, LP | Houston, TX 77094 | Oil & Gas Operator | Feb 2015 |
| 635 | Legend Natural Gas, LP | Houston, TX 77084 | Oil & Gas Operator | Aug 2004 |
| 636 | Legend Oil & Gas LTD. | Alpharetta, GA 30022 | Oil Operator | Mar 2015 |
| 637 | Legend Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | May 2010 |
| 638 | Legendary Oil Co., Inc. | | Oil Operator | Feb 2004 |
| 639 | Legendary Well Service, Inc. | | Oil Operator | Jan 1996 |
| 640 | Leger Production Company, Inc. | | Oil & Gas Operator | Apr 1984 |
| 641 | Legg, Raymond | | Oil Operator | Dec 2010 |
| 642 | Leggett Oil Company | Dallas, TX 75379 | Oil & Gas Operator | Oct 1999 |
| 643 | Leggett Petroleum, L.L.C. | | Oil & Gas Operator | Dec 2020 |
| 644 | Legleiter, Julius A. | Hays, KS 67601 | Oil Operator | Apr 1996 |
| 645 | Legrand, Buck | Sedan, KS 67361 | Oil Operator | Jun 1994 |
| 646 | Lehnertz, G. M. | Tyler, TX 75702 | Oil & Gas Operator | Dec 1998 |
| 647 | Lehnertz-Faulkner, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Feb 2023 |
| 648 | Leicht, Cecil | Streetman, TX 75859 | Oil & Gas Operator | Feb 1998 |
| 649 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 650 | Leighty, Roger Operator | Lawrenceville, IL 62439 | Oil & Gas Operator | Oct 1997 |
| 651 | Leiker, Edward P. | Hays, KS 67601 | Oil Operator | Apr 1992 |
| 652 | Leis Oil Services, LLC | Yates Center, KS 66783 | Oil Operator | Jul 2023 |
| 653 | Leis, John E. | Yates Center, KS 66783 | Oil Operator | May 2026 |
| 654 | Leis, Ryan M. | Scottsdale, AZ 85258 | Oil & Gas Operator | Dec 2009 |
| 655 | Leis, Steven A. | Yates Center, KS 66783 | Oil Operator | May 2026 |
| 656 | Leis, VIctor J. | Paola, KS 66071 | Oil & Gas Operator | May 2026 |
| 657 | Leith Operations | | Oil Operator | Jul 1989 |
| 658 | Lejan, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Sep 2026 |
| 659 | Lekan James V | Ashland, OH 44805 | Oil & Gas Operator | Dec 1997 |
| 660 | Leland Chapman Dba Chapman Oil Company | Duncan, OK 73533 | Oil & Gas Operator | Jun 2026 |
| 661 | Leland Oil & Gas, LLC | | Oil & Gas Operator | Jun 2026 |
| 662 | Leland Petroleum Production Inc | | Oil & Gas Operator | Dec 2007 |
| 663 | Lem Operating Co., Inc. | Colorado City, TX 79512 | Oil & Gas Operator | Nov 2012 |
| 664 | Lema Petroleum Inc | Seminole, OK 74868 | Oil & Gas Operator | Jul 2026 |
| 665 | Lemay Oil Company | Snyder, TX 79549 | Oil & Gas Operator | Jun 2002 |
| 666 | Lemley Oil Corporation | Sulphur, OK 73086-9316 | Oil & Gas Operator | Aug 2025 |
| 667 | Lemon, Richard F. Jr. | Carrollton, TX 75006 | Oil & Gas Operator | Sep 2026 |
| 668 | Lenape Resources Corp | | Oil & Gas Operator | Dec 2000 |
| 669 | Lendrum Energy LLC | Cranberry, PA 16319-4009 | Oil & Gas Operator | Dec 2025 |
| 670 | Lenert & Pettitt, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 1994 |
| 671 | Lengacher William P | Creston, OH 44217 | Oil & Gas Operator | Dec 2025 |
| 672 | Lenhart Oil Company | Cashion, OK 73016-0188 | Oil & Gas Operator | Jul 2016 |
| 673 | Lennon Oil Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Oct 2008 |
| 674 | Leo Michaelis Oil Operator | | Oil Operator | Oct 2002 |
| 675 | Leo Vesenmeir, Jr. | | Oil & Gas Operator | Jul 1987 |
| 676 | Leo Windham | | Oil Operator | Jul 1992 |
| 677 | Leon J. Sabean | | Oil & Gas Operator | Dec 2018 |
| 678 | Leonard 1&2 LLC | | Oil Operator | Jul 2026 |
| 679 | Leonard Brothers Operating Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2026 |
| 680 | Leonard Vann | | Oil Operator | Apr 2026 |
| 681 | Leonard, Daniel M. | Fort Worth, TX 76101 | Oil & Gas Operator | Nov 2001 |
| 682 | Leonard, J. A. | Austin, TX 78734 | Oil & Gas Operator | Sep 2026 |
| 683 | Leonard, Patricia Anne | San Antonio, TX 78209 | Oil & Gas Operator | Oct 1996 |
| 684 | Leone, Thomas E. | Elma, NY 14059 | Gas Operator | Dec 2025 |
| 685 | Leopard, Glenn | Malakoff, TX 75148 | Oil & Gas Operator | Aug 2003 |
| 686 | Leopold Oil Company | Bartlesville, OK 74003 | Oil & Gas Operator | Jun 2026 |
| 687 | Leopoldo P Bustamante | Midland, TX 79710 | Oil & Gas Operator | Apr 2012 |
| 688 | Leor Energy Indigo L.P. | Houston, TX 77079 | Gas Operator | Oct 2017 |
| 689 | Lep Development Company, LLC | Houston, TX 77007 | Oil & Gas Operator | Jul 2020 |
| 690 | Lepp, Paul N. | Cherry Creek, NY 14723 | Gas Operator | Dec 2025 |
| 691 | Lera | Borger, TX 79007 | Oil & Gas Operator | Sep 2026 |
| 692 | Lerblance Jr W P Estate | Hartshorne, OK 74547-0449 | Oil & Gas Operator | Apr 2020 |
| 693 | Leroy Holt Oil Operations | | Oil Operator | Mar 2010 |
| 694 | Leroy Oil Co. | Gainesville, TX 76240 | Oil & Gas Operator | Jun 2002 |
| 695 | Leroy W. James | | Oil & Gas Operator | Oct 1991 |
| 696 | Les Miller | | Oil & Gas Operator | Dec 1991 |
| 697 | Lesco Corp. | | Oil Operator | Dec 2000 |
| 698 | Leshen Energy USA LLC | | Oil Operator | Jan 2025 |
| 699 | Lesikar, L. W. | Fort Worth, TX 76121 | Oil & Gas Operator | Jun 2006 |
| 700 | Leslie Oil & Gas Co Inc | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1991 |