| 1 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Jun 2025 |
| 2 | La VIda Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 1993 |
| 3 | Lace Operating | Fort Worth, TX 76114 | Oil & Gas Operator | Jun 1997 |
| 4 | Larson, Perry L Operating Co Inc | Dallas, TX 75382 | Oil & Gas Operator | Feb 2021 |
| 5 | Leahy Oil, LLC | Arlington, TX 76006 | Oil Operator | Jun 2025 |
| 6 | Leclair Operating Co., Inc. | Abilene, TX 79602 | Oil & Gas Operator | Jun 2025 |
| 7 | Leffel'S, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Jun 2020 |
| 8 | Lewis & Hays | Albany, TX 76430 | Oil & Gas Operator | Feb 2002 |
| 9 | Lewis, William T. | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 10 | Liberty Resources Co. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 1994 |
| 11 | Lindley, J. R. | Richardson, TX 75081 | Oil & Gas Operator | Jun 2002 |
| 12 | Lindsay Oil Operations | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2010 |
| 13 | Lindsay, Robert L. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 1995 |
| 14 | Littlepage, Tommy | Graham, TX 76450 | Oil & Gas Operator | May 1996 |
| 15 | Livingston, David Oil Company | Haskell, TX 79521 | Oil & Gas Operator | Aug 2003 |
| 16 | Livingston, F. L. | Megargel, TX 76370 | Oil & Gas Operator | May 2018 |
| 17 | Lobo Oil Company | Woodson, TX 76491 | Oil & Gas Operator | Sep 1999 |
| 18 | Longhorn Oil Properties, Inc. | Pottsboro, TX 75076 | Oil & Gas Operator | Jun 2025 |
| 19 | LT Oil Company | Midland, TX 79705 | Oil & Gas Operator | Jun 2025 |
| 20 | Luff Exploration Company | Denver, CO 80203 | Oil & Gas Operator | Apr 2025 |
| 21 | Lyon Operating Company Inc.(Iii) | Jacksboro, TX 76458 | Oil & Gas Operator | Jun 2025 |