| 1 | L P C Energy, Inc. | | Oil & Gas Operator | Mar 1985 |
| 2 | La Mesa Production, Inc. | | Oil & Gas Operator | Apr 2004 |
| 3 | La. Land & Expl. Co. | | Oil & Gas Operator | Dec 2010 |
| 4 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 5 | Lamson/Crocker Petroleum Corp. | | Oil & Gas Operator | May 1988 |
| 6 | Lamson/Onshore Petroleum Corp. | | Oil & Gas Operator | Sep 1985 |
| 7 | Lanoco, Inc. | | Oil & Gas Operator | Sep 2002 |
| 8 | Lapis Operating, Inc. | Houston, TX 77042 | Oil & Gas Operator | Jul 2015 |
| 9 | Las Services, Inc. | | Oil & Gas Operator | Oct 1997 |
| 10 | Leads Resources, L.L.C. | | Oil & Gas Operator | Jan 2017 |
| 11 | Lear Petroleum Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 12 | Legacy Operating Company | | Oil & Gas Operator | Aug 1992 |
| 13 | Legacy Resources Co., L.P. | | Oil & Gas Operator | Apr 2019 |
| 14 | Legendary Oil Co., Inc. | | Oil Operator | Feb 2004 |
| 15 | LGS Exploration, Inc. | | Oil & Gas Operator | Jan 1991 |
| 16 | Liberty Oil And Gas Corp. | Olney, IL 62450-2489 | Oil & Gas Operator | Dec 2021 |
| 17 | Linder Oil Company | | Oil & Gas Operator | Apr 1985 |
| 18 | Linder Oil Company,A Partnership | Shreveport, LA 71136 | Oil & Gas Operator | Oct 2025 |
| 19 | Llog Expl. Co. | Metairie, LA 70005 | Oil & Gas Operator | Jan 2003 |
| 20 | Llog Exploration Company, L.L.C. | | Oil & Gas Operator | Jun 2025 |
| 21 | Llox, L.L.C. | Covington, LA 70433 | Oil & Gas Operator | Oct 2025 |
| 22 | LNG Gathering Company | | Oil Operator | Oct 2024 |
| 23 | Louisiana Crude Oil&Gas Co Inc | | Oil & Gas Operator | Mar 1984 |
| 24 | Louisiana Resources Co | | Oil Operator | May 1992 |
| 25 | Loutex Energy, Inc. | | Oil & Gas Operator | Nov 1987 |
| 26 | Lucky Lad Energy, LLC | Magnolia, TX 77353 | Oil & Gas Operator | Oct 2025 |
| 27 | Lynal, Inc. | | Oil & Gas Operator | Oct 1988 |
| 28 | Lyons Petroleum Inc.-Dykes | | Oil & Gas Operator | Oct 1988 |
| 29 | Lyons Petroleum, Inc. | | Oil & Gas Operator | Oct 1988 |