| 1 | L & H Oil Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 1999 |
| 2 | L & J Oil | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2000 |
| 3 | L & S Drilling, Inc. | Kamay, TX 76369 | Oil & Gas Operator | Mar 2016 |
| 4 | L L & M Properties, Inc. | Burkburnett, TX 76354 | Oil & Gas Operator | Aug 2004 |
| 5 | L-R Production | Olney, TX 76374 | Oil & Gas Operator | Dec 2024 |
| 6 | La Jolla Oil & Gas, Inc. | Frisco, TX 75034 | Oil & Gas Operator | Dec 2024 |
| 7 | La Mar, Paul W. | Nocona, TX 76255 | Oil & Gas Operator | May 1995 |
| 8 | La Roca Energy, LP | Dallas, TX 75207 | Oil & Gas Operator | May 2024 |
| 9 | Lamar Oil Company | Nocona, TX 76255 | Oil & Gas Operator | Oct 2015 |
| 10 | Lamco Oil, LLC | Nocona, TX 76255 | Oil & Gas Operator | Dec 2024 |
| 11 | Landrum Petroleum Co., Inc. | Burkburnett, TX 76354 | Oil Operator | Mar 2008 |
| 12 | Landrum West, Inc. | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 1997 |
| 13 | Lankford, Dan L. | Graham, TX 76450 | Oil & Gas Operator | Dec 2024 |
| 14 | LC Operating, LLC | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2024 |
| 15 | Leclair Operating Co., Inc. | Abilene, TX 79602 | Oil & Gas Operator | Dec 2024 |
| 16 | Legacy Petroleum Corporation | Dallas, TX 75225 | Oil & Gas Operator | Mar 2019 |
| 17 | Leonard Brothers Operating Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Dec 2024 |
| 18 | Lewis & Hays | Albany, TX 76430 | Oil & Gas Operator | Feb 2002 |
| 19 | Lewis Operating Company | Holliday, TX 76366 | Oil & Gas Operator | Dec 2024 |
| 20 | Lewis, William T. | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 21 | Lindemann, James D. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |
| 22 | Lindemann, Robert Operating | Holliday, TX 76366 | Oil & Gas Operator | Dec 2024 |
| 23 | Lindemann, W. L., DRLG. Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1994 |
| 24 | Lindemann, W.L., Oper. Co., Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2006 |
| 25 | Lindsay Oil Operations | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2010 |
| 26 | Lindsay, Dick | Graham, TX 76450 | Oil & Gas Operator | May 2015 |
| 27 | Lindsay, Robert L. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 1995 |
| 28 | Little, Quintin Company,Inc.,The | Ardmore, OK 73402 | Oil & Gas Operator | Dec 2024 |
| 29 | Littlepage, Tommy | Graham, TX 76450 | Oil & Gas Operator | May 1996 |
| 30 | Livingston, David Oil Company | Haskell, TX 79521 | Oil & Gas Operator | Aug 2003 |
| 31 | Livingston, F. L. | Megargel, TX 76370 | Oil & Gas Operator | May 2018 |
| 32 | LMH Energy | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2024 |
| 33 | Lode Holdings, LLC | Wichita Falls, TX 76301 | Oil Operator | Dec 2024 |
| 34 | Lofton, W. A. | Wichita Falls, TX 76301 | Oil & Gas Operator | Jun 1998 |
| 35 | Lonestar Production Services | Graham, TX 76450 | Oil Operator | Dec 2024 |
| 36 | Lunn, Will | Wichita Falls, TX 76301 | Oil & Gas Operator | Jun 1997 |
| 37 | Lutz And Boyd | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2024 |
| 38 | LW Operating Co. | Wichita Falls, TX 76310 | Oil Operator | Dec 2024 |
| 39 | Lyon Operating Company Inc.(Iii) | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2024 |