| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | L & J Operating Inc | Gillette, WY 82718 | Oil & Gas Operator | Aug 2016 |
| 2 | L R Company | Casper, WY 82602 | Oil & Gas Operator | Sep 2007 |
| 3 | La Prele Exploration | Oil & Gas Operator | Oct 1979 | |
| 4 | Lappin Oil LLC | Douglas, WY 82633 | Oil & Gas Operator | Sep 2025 |
| 5 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Oct 2025 |
| 6 | Lawson Oil Company | Buckeye, AR 85326 | Oil Operator | Mar 1996 |
| 7 | Lear Petroleum Exploration | Oil & Gas Operator | Jul 2013 | |
| 8 | Levinson Partners Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 1995 |
| 9 | Lexicon Resources Corporation | Oil & Gas Operator | Apr 1986 | |
| 10 | Loil Oil LLC | Golden, CO 80402 | Oil & Gas Operator | Aug 2025 |
| 11 | Long Trust The | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2008 |
| 12 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |