| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | L B Petroleum In | Oil Operator | Nov 1995 | |
| 2 | L. D. Drilling, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Jan 2024 |
| 3 | Landmark Oil Exp | Oil Operator | Sep 1994 | |
| 4 | Landmark Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jan 2024 |
| 5 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | May 2024 |
| 6 | Larson Operating Company | Olmitz, KS 67564-8561 | Oil & Gas Operator | Dec 2019 |
| 7 | Leith Operations | Oil Operator | Jul 1989 | |
| 8 | Liberty Enterpri | Oil Operator | Jan 1987 |