| 1 | L & R Energy Corporation | Spearman, TX 79081 | Oil & Gas Operator | Nov 2014 |
| 2 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 3 | Lakeshore Operating, LLC | Wichita, KS 67203 | Oil & Gas Operator | Oct 2025 |
| 4 | Laneer Resources Company | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 5 | Langford, G. E. | Abilene, TX 79604 | Oil & Gas Operator | Jan 2002 |
| 6 | Largo Oil Company | Longview, TX 75606 | Oil & Gas Operator | Oct 2025 |
| 7 | Layline Petroleum I, LLC | Houston, TX 77024 | Oil & Gas Operator | May 2013 |
| 8 | Leading Edge Energy LLC | San Antonio, TX 78205 | Oil Operator | Oct 2025 |
| 9 | Leclair Operating Co., Inc. | Abilene, TX 79602 | Oil & Gas Operator | Oct 2025 |
| 10 | Ledbetter, Jerald D. Estate Of | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 11 | Ledbetter, Jerald D. Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | Jan 2007 |
| 12 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 13 | Leonard Brothers Operating Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Oct 2025 |
| 14 | Liberty Resources Co. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 1994 |
| 15 | Lime Rock Resources A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 16 | Littlepage, Tommy | Graham, TX 76450 | Oil & Gas Operator | May 1996 |
| 17 | Llewellin Operating Company, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2017 |
| 18 | Lobo Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 1995 |
| 19 | Lone Star Gas Co. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 20 | Lone Star Pipeline Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 21 | Long Trusts, The | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 22 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 23 | Lowrance Inc. | Eastland, TX 76448 | Oil & Gas Operator | Oct 2025 |
| 24 | LSM Ventures, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 2020 |
| 25 | Lynx Oil Co., Inc. | Denton, TX 76207 | Oil & Gas Operator | Sep 2003 |
| 26 | Lyon Operating Company Inc.(Iii) | Jacksboro, TX 76458 | Oil & Gas Operator | Oct 2025 |
| 27 | Lytle Creek Operating, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Oct 2025 |