| 1 | L & L Resources, Inc. | Hays, KS 67601 | Oil Operator | Mar 1986 |
| 2 | L & R Energy Corporation | Spearman, TX 79081 | Oil & Gas Operator | Nov 2014 |
| 3 | L & R Petroleum | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 4 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 5 | Lake Ronel Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Jul 2017 |
| 6 | Lancer Petroleum Corporation | Irving, TX 75014 | Oil & Gas Operator | Feb 2014 |
| 7 | Largo Oil Company | Longview, TX 75606 | Oil & Gas Operator | Oct 2025 |
| 8 | Lawton, Jack Inc. | Sulphur, LA 70663 | Oil & Gas Operator | Dec 1995 |
| 9 | Lease Holders Acquisitions LLC | Yukon, OK 73099 | Gas Operator | Oct 2025 |
| 10 | Lehnertz, G. M. | Tyler, TX 75702 | Oil & Gas Operator | Dec 1998 |
| 11 | Lehnertz-Faulkner, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Feb 2023 |
| 12 | Leonard, Patricia Anne | San Antonio, TX 78209 | Oil & Gas Operator | Oct 1996 |
| 13 | Lillis, Michael D. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 14 | Linder, John G. Jr. | Gladewater, TX 75647 | Oil & Gas Operator | Apr 2005 |
| 15 | Linder, John Operating Co., LLC | Gladewater, TX 75647 | Oil & Gas Operator | Oct 2025 |
| 16 | Little & Whyte Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Mar 2008 |
| 17 | LKD Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2018 |
| 18 | Log Operating, LLC | Eagle Pass, TX 78853 | Oil & Gas Operator | Oct 2025 |
| 19 | Loin Energy Corporation | La Grange, TX 78945 | Oil & Gas Operator | Oct 2025 |
| 20 | Long Trusts, The | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 21 | Long, Larry T. | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2017 |
| 22 | Long-Tex Exploration, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Oct 2025 |
| 23 | Longview Production, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2002 |
| 24 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 25 | Low-End Oil LLC | Austin, TX 78748 | Oil Operator | Oct 2025 |
| 26 | LTS Oil & Gas | Lubbock, TX 79424 | Oil & Gas Operator | Oct 2025 |
| 27 | LTS Oil & Gas A | Lubbock, TX 79424 | Oil & Gas Operator | Oct 2025 |