| 1 | L & R Energy Corporation | Spearman, TX 79081 | Oil & Gas Operator | Nov 2014 |
| 2 | L & S Drilling, Inc. | Kamay, TX 76369 | Oil & Gas Operator | Mar 2016 |
| 3 | L7 Energy LLC | Wichita Falls, TX 76308 | Oil Operator | Oct 2025 |
| 4 | Lackey, William H. Oil And Gas | Shawnee, OK 74804 | Oil & Gas Operator | Feb 2024 |
| 5 | Lafonda Energy LLC | Vernon, TX 76384 | Oil Operator | Oct 2025 |
| 6 | Landrum Petroleum Co., Inc. | Burkburnett, TX 76354 | Oil Operator | Mar 2008 |
| 7 | Landrum West, Inc. | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 1997 |
| 8 | Layline Energy I LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2019 |
| 9 | LC Operating, LLC | Burkburnett, TX 76354 | Oil & Gas Operator | Oct 2025 |
| 10 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Oct 2025 |
| 11 | Lillis, Michael D. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 12 | Lime Rock Resources IV-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 13 | Limestone Oil & Gas Co. | Wichita Falls, TX 76302 | Oil & Gas Operator | Jul 2002 |
| 14 | Lincoln Energy Partners, LLC | Graham, TX 76450 | Oil Operator | Oct 2025 |
| 15 | Lindemann, W. L., DRLG. Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1994 |
| 16 | Lindemann, W.L., Oper. Co., Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2006 |
| 17 | LMH Energy | Wichita Falls, TX 76302 | Oil & Gas Operator | Oct 2025 |
| 18 | Lode Holdings, LLC | Wichita Falls, TX 76301 | Oil Operator | Oct 2025 |
| 19 | Lofton, W. A. | Wichita Falls, TX 76301 | Oil & Gas Operator | Jun 1998 |
| 20 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 21 | Loutex Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |