| 1 | L & L Smith Energy Corporation | Muskogee, OK 74403-8479 | Oil & Gas Operator | Jan 2023 |
| 2 | L & N Exploration Inc | | Oil & Gas Operator | Jul 2013 |
| 3 | L & R Energy Corporation | Spearman, TX 79081 | Oil & Gas Operator | Nov 2014 |
| 4 | L And R Oil Company | Oakley, KS 67748 | Oil & Gas Operator | Jan 2004 |
| 5 | L.L. Oil Company | Freer, TX 78357 | Oil & Gas Operator | Oct 2025 |
| 6 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 7 | Lagoon Water Logistics LLC | Oklahoma City, OK 73103 | Oil Operator | Jul 2024 |
| 8 | Lamamco Drilling Company | Skiatook, OK 74070 | Oil & Gas Operator | Jun 2025 |
| 9 | Lammerts Robert P | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2002 |
| 10 | Lancer Energy Corporation | Oklahoma City, OK 73132-5903 | Oil & Gas Operator | May 2015 |
| 11 | Lariat Petroleum Inc | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2024 |
| 12 | Larkin Energy Company Inc | Sasakwa, OK 74867 | Oil & Gas Operator | May 2022 |
| 13 | Latigo Oil & Gas, Inc. | Woodward, OK 73801 | Oil & Gas Operator | Jul 2025 |
| 14 | Laurel Operating Company, Inc. | Stillwater, OK 74074-3025 | Oil & Gas Operator | Jun 2025 |
| 15 | Lawrence James Oil Prop Inc | Catoosa, OK 74015 | Oil & Gas Operator | Feb 2012 |
| 16 | Lawrence, C. F. & Assoc. Inc. | Lubbock, TX 79401 | Oil & Gas Operator | Oct 2025 |
| 17 | LCB Resources LLC | Kingfisher, OK 73750-2322 | Oil & Gas Operator | Jul 2025 |
| 18 | Legacy Energy Services LLC | Stillwater, OK 74074 | Oil & Gas Operator | Jul 2025 |
| 19 | Lenhart Oil Company | Cashion, OK 73016-0188 | Oil & Gas Operator | Jul 2016 |
| 20 | Lewis Oil Operations LLC | Ratliff City, OK 73481 | Oil & Gas Operator | Jun 2025 |
| 21 | Lillard Pipe & Supply Inc | Shawnee, OK 74802-0847 | Oil & Gas Operator | Nov 2014 |
| 22 | Lime Rock Resources II-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 23 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Jun 2025 |
| 24 | Linn Mid-Continent Operating Inc | Houston, TX 77002-3018 | Oil & Gas Operator | Jun 2016 |
| 25 | Lion Petroleum Company | Oklahoma City, OK 73120-4503 | Oil & Gas Operator | Aug 2015 |
| 26 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Jun 2025 |
| 27 | Locators Oil And Gas Inc | Guthrie, OK 73044 | Oil & Gas Operator | Oct 2022 |
| 28 | Longfellow Energy, LP | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 29 | Lorentz Oil & Gas LLC | Edmond, OK 73034-7266 | Oil & Gas Operator | Jun 2025 |
| 30 | Lu-Ray Petroleum LLC | Oklahoma City, OK 73121-1607 | Oil & Gas Operator | Jul 2025 |
| 31 | Lvi Enterprises Trust | Plano, TX 75093-7789 | Oil & Gas Operator | Nov 2014 |
| 32 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 33 | Lynx Operating Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2025 |