| 1 | L And C Oil Company | | Oil Operator | Aug 1996 |
| 2 | L'Oil Operating And MGMT. Co. | | Oil & Gas Operator | Dec 2008 |
| 3 | La Intrastate Gas Co LLC | | Oil Operator | Apr 2004 |
| 4 | Lamar Hunt Trust Est Etal | | Oil & Gas Operator | Aug 1996 |
| 5 | Largo Oil Company | Longview, TX 75606 | Oil & Gas Operator | Mar 2025 |
| 6 | Laser Gas Company I, LLC | | Oil Operator | Aug 2007 |
| 7 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 8 | Latham & Bonner | | Oil Operator | Aug 1987 |
| 9 | Latham, Bonner & Hall | | Oil Operator | Mar 1988 |
| 10 | Layton Energy Inc. | Houston, TX 77027 | Oil & Gas Operator | Mar 2025 |
| 11 | Lenert & Pettitt, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 1994 |
| 12 | Lightning Productions, Inc. | | Oil & Gas Operator | Mar 1990 |
| 13 | Lindenmuth & Associates | | Oil & Gas Operator | Aug 2001 |
| 14 | Live Oak Petroleum, Inc. | Dallas, TX 75251 | Gas Operator | Mar 2001 |
| 15 | Lloyd E. Hargrove | | Oil & Gas Operator | Aug 1998 |
| 16 | Long Oil & Natural Gas Corp. | | Oil & Gas Operator | Feb 1996 |
| 17 | Long Oil And Gas Expl., LTD | | Oil & Gas Operator | Apr 1988 |
| 18 | Long Operating, L.L.C. | Shreveport, LA 71166 | Oil & Gas Operator | Jun 2006 |
| 19 | Louisiana Energy Consultants, Inc. | | Oil & Gas Operator | Dec 2024 |
| 20 | Louisiana General Petr. Corp. | | Oil & Gas Operator | Mar 1980 |
| 21 | Louisiana Intrastate Gas Corp. | | Oil Operator | Feb 1994 |
| 22 | Louisiana Operating Co., Inc. | | Oil & Gas Operator | Aug 1994 |
| 23 | Louisiana-Hunt Petroleum Corp. | | Oil & Gas Operator | Dec 1985 |
| 24 | Loutex Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 25 | Lyons Petroleum, Inc. | | Oil & Gas Operator | Oct 1988 |