| 1 | L & R Petroleum | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 2 | L. R. Resources II | | Oil & Gas Operator | Feb 1991 |
| 3 | La. Land & Expl. Co. | | Oil & Gas Operator | Dec 2010 |
| 4 | Lamar Matlock | | Oil Operator | Jan 2025 |
| 5 | Lanford Drilling Co., Inc. | | Oil Operator | Jun 1996 |
| 6 | Lark Production, Inc. | | Oil & Gas Operator | Mar 2023 |
| 7 | Laser Gas Company I, LLC | | Oil Operator | Aug 2007 |
| 8 | Legacy Resources Co., L.P. | | Oil & Gas Operator | Apr 2019 |
| 9 | Lexico Exploration | | Oil Operator | Mar 1986 |
| 10 | LHC Petroleum Corporation | | Oil & Gas Operator | Jul 2001 |
| 11 | Liberty Oil And Gas Corp. | Olney, IL 62450-2489-2489 | Oil & Gas Operator | Dec 2021 |
| 12 | Liberty Operating Company,LLC | | Oil & Gas Operator | Jan 2025 |
| 13 | Lindenmuth & Associates | | Oil & Gas Operator | Aug 2001 |
| 14 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 15 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 16 | Lloyd E. Hargrove | | Oil & Gas Operator | Aug 1998 |
| 17 | Long Oil & Natural Gas Corp. | | Oil & Gas Operator | Feb 1996 |
| 18 | Long Trusts, The | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 19 | Louisiana Energy Consultants, Inc. | | Oil & Gas Operator | Dec 2024 |
| 20 | Louisiana Minerals, LTD. | Houston, TX 77024 | Oil & Gas Operator | Jul 1988 |
| 21 | Louisiana-Hunt Petroleum Corp. | | Oil & Gas Operator | Dec 1985 |
| 22 | Loutex Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 23 | Lyons Petroleum Inc.-Dykes | | Oil & Gas Operator | Oct 1988 |