| 2601 | L & W Oil & Gas, Inc. | | Oil & Gas Operator | May 1994 |
| 2602 | L And C Oil Company | | Oil Operator | Aug 1996 |
| 2603 | L And L Production Company | Skellytown, TX 79080 | Oil & Gas Operator | Sep 1996 |
| 2604 | L B Simmons Energy Inc | Midland, TX BAD ADDR | Oil & Gas Operator | Oct 1996 |
| 2605 | L E Carpenter Oil & Gas, Inc. | | Oil & Gas Operator | Sep 1985 |
| 2606 | L L & H E Kidd | | Gas Operator | Sep 1990 |
| 2607 | L P C Energy, Inc. | | Oil & Gas Operator | Mar 1985 |
| 2608 | L&N DRLG Co&K.D. Lankford, Jr | | Gas Operator | Aug 2006 |
| 2609 | L'Oil Operating & Management Co., Inc. | | Oil & Gas Operator | Nov 2024 |
| 2610 | L'Oil Operating And MGMT. Co. | | Oil & Gas Operator | Dec 2008 |
| 2611 | L. A. West | | Gas Operator | Feb 2000 |
| 2612 | L. C. Geer & Associates | | Oil & Gas Operator | Jan 1987 |
| 2613 | L. D. McMullan | | Oil Operator | Jun 2023 |
| 2614 | L. E. Gillespie | | Oil Operator | Sep 1984 |
| 2615 | L. E. Hester | | Gas Operator | Oct 2004 |
| 2616 | L. R. Fitzgerald | | Oil & Gas Operator | Feb 2015 |
| 2617 | L. R. Resources II | | Oil & Gas Operator | Feb 1991 |
| 2618 | L. W. Snuffy McCartney | | Oil Operator | Jul 2015 |
| 2619 | L.C. Coon Production Co. | | Oil Operator | Apr 1995 |
| 2620 | L.J. Exploration, Inc. | | Oil & Gas Operator | Dec 2020 |
| 2621 | L.L. Oil Company | Freer, TX 78357 | Oil & Gas Operator | Feb 2026 |
| 2622 | L.S.E. Energy-V.P. Smith | | Oil Operator | Mar 1988 |
| 2623 | La Chalk Gathering System | | Oil Operator | Jan 2006 |
| 2624 | La Coastal Pet.Services Co Inc | | Oil & Gas Operator | Dec 1982 |
| 2625 | La Delta Farms Oil Company LLC | | Oil & Gas Operator | Dec 2024 |
| 2626 | La Gas Dev Corp/Araxas | | Oil & Gas Operator | Dec 2001 |
| 2627 | La Intrastate Gas Co LLC | | Oil Operator | Apr 2004 |
| 2628 | La Mesa Production, Inc. | | Oil & Gas Operator | Apr 2004 |
| 2629 | La. Fete Oil & Gas, Inc. | | Oil & Gas Operator | May 1995 |
| 2630 | La. Gas Production, L.C. | | Gas Operator | Sep 2018 |
| 2631 | La. Land & Expl. Co. | | Oil & Gas Operator | Dec 2010 |
| 2632 | La. Mining & Minerals, Inc. | | Oil & Gas Operator | Jul 2000 |
| 2633 | La. Nap. Inc. Lanlock Res Inc | | Oil Operator | Feb 1995 |
| 2634 | La. Onshore Properties Inc. | | Oil & Gas Operator | Dec 2000 |
| 2635 | La.-TX. Operating, Inc. | | Oil & Gas Operator | May 1998 |
| 2636 | La.Gas Service Expl. Program | | Gas Operator | Dec 1989 |
| 2637 | Labelle Petroleum, Inc. | | Oil & Gas Operator | Oct 1990 |
| 2638 | Lace Operating | Fort Worth, TX 76114 | Oil & Gas Operator | Jun 1997 |
| 2639 | Lacour & Nix | | Oil & Gas Operator | May 1986 |
| 2640 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 2641 | Lafayette Oilfield Contractors, Inc. | | Oil Operator | Dec 2024 |
| 2642 | Lagniappe Interests, Inc. | | Oil & Gas Operator | Dec 2003 |
| 2643 | Lagniappe Operating, LLC | | Oil Operator | Dec 2024 |
| 2644 | Lago Petroleum Co. | | Oil & Gas Operator | Jan 1992 |
| 2645 | Lago VIsta Operating, L.L.C. | | Oil Operator | Dec 2024 |
| 2646 | Lahoma Gas Company | | Gas Operator | Dec 1980 |
| 2647 | Lahoma Operating, Inc. | | Oil & Gas Operator | Nov 2025 |
| 2648 | Lake A, LTD. | | Oil Operator | May 1998 |
| 2649 | Lake Racourci Gath Sys, LLC | | Oil Operator | May 2004 |
| 2650 | Lake Ronel Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Jul 2017 |
| 2651 | Lakeshore Petroleum Corp. | | Oil & Gas Operator | Dec 1992 |
| 2652 | Lakeside Exploration Corp. | | Gas Operator | Aug 1986 |
| 2653 | Lakeside Resources | | Oil & Gas Operator | Mar 1989 |
| 2654 | Lamamco Drilling Company | Skiatook, OK 74070 | Oil & Gas Operator | Nov 2025 |
| 2655 | Lamar Hunt | | Oil & Gas Operator | Oct 2003 |
| 2656 | Lamar Hunt Trust Est Etal | | Oil & Gas Operator | Aug 1996 |
| 2657 | Lamar Hunt Trust Est. | | Oil & Gas Operator | Mar 1978 |
| 2658 | Lamar Matlock | | Oil Operator | Jan 2025 |
| 2659 | Lamar Oil & Gas, Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Feb 2026 |
| 2660 | Lamar Smith | | Oil Operator | Aug 1991 |
| 2661 | Lamson Petroleum Corporation | | Oil & Gas Operator | Mar 1993 |
| 2662 | Lamson/Crocker Petroleum Corp. | | Oil & Gas Operator | May 1988 |
| 2663 | Lamson/Onshore Petroleum Corp. | | Oil & Gas Operator | Sep 1985 |
| 2664 | Lance Gas & Oil Productions | | Oil & Gas Operator | Jan 2025 |
| 2665 | Lancer Resources Company | | Oil & Gas Operator | Jan 1998 |
| 2666 | Land & Natural Res. Dev., Inc. | | Oil & Gas Operator | Apr 2007 |
| 2667 | Landmark Venture Group No. 1, Inc. | | Oil & Gas Operator | Jan 2025 |
| 2668 | Landmark Venture Group, Inc. | | Oil Operator | Dec 2008 |
| 2669 | Lanford Drilling Co., Inc. | | Oil Operator | Jun 1996 |
| 2670 | Lankford & Nance | | Gas Operator | Dec 2010 |
| 2671 | Lanmarc Resources | | Oil Operator | Dec 2003 |
| 2672 | Lanoco, Inc. | | Oil & Gas Operator | Sep 2002 |
| 2673 | Lapis Operating, Inc. | Houston, TX 77042 | Oil & Gas Operator | Jul 2015 |
| 2674 | Largo Oil Company | Longview, TX 75606 | Oil & Gas Operator | Feb 2026 |
| 2675 | Lark Production, Inc. | | Oil & Gas Operator | Mar 2023 |
| 2676 | Las Services, Inc. | | Oil & Gas Operator | Oct 1997 |
| 2677 | Laser Gas Company I, LLC | | Oil Operator | Aug 2007 |
| 2678 | Lasmo Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2024 |
| 2679 | Laster Welding And Well Serv, Inc. | | Gas Operator | Jul 2020 |
| 2680 | Lastrada Oil And Gas LTD | | Oil & Gas Operator | May 1992 |
| 2681 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 2682 | Latexo Oil & Gas Co. | | Oil Operator | Sep 1986 |
| 2683 | Latham & Bonner | | Oil Operator | Aug 1987 |
| 2684 | Latham Exploration Company Inc | | Oil & Gas Operator | Aug 1992 |
| 2685 | Latham Production & Service Co | | Oil Operator | Jul 1989 |
| 2686 | Latham, Bonner & Hall | | Oil Operator | Mar 1988 |
| 2687 | Laurel Operating Company | Stillwater, OK 74074-3025 | Oil & Gas Operator | Nov 2025 |
| 2688 | Lavaca River Operating Co., LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2026 |
| 2689 | Lavino Oil And Gas Company | | Oil & Gas Operator | Aug 1989 |
| 2690 | Lawson Engineering, Inc. | | Oil & Gas Operator | Dec 1984 |
| 2691 | Lax, Inc. | | Oil & Gas Operator | Nov 1987 |
| 2692 | Layline Petroleum I, LLC | Houston, TX 77024 | Oil & Gas Operator | May 2013 |
| 2693 | Layton Energy Inc. | Houston, TX 77027 | Oil & Gas Operator | Feb 2026 |
| 2694 | Layton Oil Co | | Oil Operator | Feb 1994 |
| 2695 | Lea Exploration, Inc. | | Oil & Gas Operator | Nov 1989 |
| 2696 | Leads Resources, L.L.C. | | Oil & Gas Operator | Jan 2017 |
| 2697 | Lear Gas Transmission | | Oil Operator | Aug 1989 |
| 2698 | Lear Petroleum Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 2699 | Leatherman Creek, Inc. | | Oil Operator | Jul 2001 |
| 2700 | Lebus Oilfield Service Co | | Oil Operator | Sep 2009 |