| 1 | L.J.M. Corporation | Houston, TX 77025 | Oil & Gas Operator | Jun 2012 |
| 2 | Lacy, F. B. Inc. | Houston, TX 77055 | Oil & Gas Operator | Sep 1997 |
| 3 | Lamay Corporation | Rosenberg, TX 77471 | Oil & Gas Operator | Oct 2025 |
| 4 | Lavaca Canyon Petroleum LLC | Houston, TX 77094 | Oil & Gas Operator | Oct 2025 |
| 5 | Lavaca River Operating Co., LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 6 | Lewis Petro Properties, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Oct 2025 |
| 7 | LGDC Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 8 | Lighthouse Operating, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Jun 2021 |
| 9 | Little, Lou Operating Co., Inc. | Portland, TX 78374 | Oil & Gas Operator | Sep 2014 |
| 10 | Live Oak Op & Production, L.L.C. | Austin, TX 78759 | Oil & Gas Operator | Nov 2011 |
| 11 | Lode Holdings, LLC | Wichita Falls, TX 76301 | Oil Operator | Oct 2025 |
| 12 | Lodi Drilling & Service Co. | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Oct 2025 |
| 13 | Lomak Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1998 |
| 14 | Lone Oak Energy Inc | Kyle, TX 78640 | Oil & Gas Operator | Oct 2025 |
| 15 | Lonestar Operating, LLC | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 16 | LTX Productions, Inc. | Houston, TX 77095 | Oil & Gas Operator | Jul 2008 |
| 17 | Lundberg Oil Co. | Dallas, TX 75360 | Oil & Gas Operator | Jan 2003 |
| 18 | Lundberg Operating Corporation | Dallas, TX 75225 | Oil & Gas Operator | Oct 2002 |
| 19 | Lytle Creek Operating, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Oct 2025 |