| 1 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Jun 2026 |
| 2 | Lance Leasing | Odessa, TX 79765 | Oil Operator | Jun 2026 |
| 3 | Lancer Petroleum Corporation | Irving, TX 75014 | Oil & Gas Operator | Feb 2014 |
| 4 | Landmaster Partners, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Jun 2026 |
| 5 | Leclair Operating Co., Inc. | Abilene, TX 79602 | Oil & Gas Operator | Jun 2026 |
| 6 | Leclair Operating, L.L.C. | Abilene, TX 79602 | Oil & Gas Operator | Jun 2026 |
| 7 | Ledbetter, Jerald D. Estate Of | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2026 |
| 8 | Ledbetter, Jerald D. Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | Jan 2007 |
| 9 | Leighty, Roger Operator | Lawrenceville, IL 62439 | Oil & Gas Operator | Oct 1997 |
| 10 | Lewis Operating Company | Holliday, TX 76366 | Oil & Gas Operator | Jun 2026 |
| 11 | Lime Creek Enterprises | Aztec, NM 87410 | Oil & Gas Operator | Aug 2008 |
| 12 | Litchfield Production Co. | Nederland, TX 77627 | Oil & Gas Operator | Jun 2026 |
| 13 | Littlepage, Tommy | Graham, TX 76450 | Oil & Gas Operator | May 1996 |
| 14 | Lone Star Gas Co. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 15 | Lone Star Production | Lawn, TX 79530 | Oil & Gas Operator | Jun 2026 |
| 16 | Low-End Oil LLC | Austin, TX 78748 | Oil Operator | Jun 2026 |
| 17 | LTS Oil & Gas | Lubbock, TX 79424 | Oil & Gas Operator | Jun 2026 |
| 18 | Luling Oil & Gas Co Inc | San Antonio, TX 78209 | Oil Operator | Dec 1986 |
| 19 | Lumbley, W. F. | Hobbs, NM 88242 | Oil & Gas Operator | Jan 2008 |
| 20 | Lynx Oil Co., Inc. | Denton, TX 76207 | Oil & Gas Operator | Sep 2003 |
| 21 | Lytle Creek Operating, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Jun 2026 |