| 1 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Nov 2025 |
| 2 | Laguna Petroleum Corporation | Houston, TX 77046 | Oil & Gas Operator | Nov 2025 |
| 3 | Lanexco, Inc. | Sealy, TX 77474 | Oil & Gas Operator | Nov 2025 |
| 4 | Langford & Brigham Operating LLC | Austin, TX 78730 | Oil & Gas Operator | Nov 2025 |
| 5 | Langham Petroleum Expl. Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 2009 |
| 6 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Nov 2025 |
| 7 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 8 | Lavanco Energy, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2006 |
| 9 | LCX Energy, LLC | Midland, TX 79701 | Oil & Gas Operator | Jan 2010 |
| 10 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Nov 2025 |
| 11 | Leggett Oil Company | Dallas, TX 75379 | Oil & Gas Operator | Oct 1999 |
| 12 | Limark Corporation | Midland, TX 79702 | Oil & Gas Operator | Dec 2003 |
| 13 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 14 | Linn Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 15 | Lone Star Gas Co. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 16 | Lone Star Pipeline Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 17 | Lothian Oil Texas I, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Mar 2008 |
| 18 | Lubbock Energy, Inc. | Lubbock, TX 79453 | Oil & Gas Operator | Oct 1996 |
| 19 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |