| 1 | L & R Petroleum | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 2 | L-Texx Petroleum, LP | Arlington, TX 76013 | Oil & Gas Operator | Oct 2025 |
| 3 | Lacy Operations, LTD. | Longview, TX 75606 | Oil & Gas Operator | Oct 2012 |
| 4 | Lacy, R., Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2002 |
| 5 | Laddex, LTD. | Amarillo, TX 79102 | Oil & Gas Operator | Feb 2025 |
| 6 | Lake Ronel Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Jul 2017 |
| 7 | Landmark Drilling, L.L.C. | Waskom, TX 75692 | Oil Operator | Oct 2025 |
| 8 | Largo Oil Company | Longview, TX 75606 | Oil & Gas Operator | Oct 2025 |
| 9 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Oct 2025 |
| 10 | Lehnertz, G. M. | Tyler, TX 75702 | Oil & Gas Operator | Dec 1998 |
| 11 | Lehnertz-Faulkner, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Feb 2023 |
| 12 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 13 | Little & Whyte Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Mar 2008 |
| 14 | Little Cypress Oil & Gas, L.L.C. | Fullerton, CA 92834 | Oil Operator | Oct 2025 |
| 15 | Long-Tex Exploration, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Oct 2025 |
| 16 | Louisiana Energy Consultant Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 17 | Loutex Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |