| 1 | L And G Drilling | | Oil Operator | Jun 1987 |
| 2 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 3 | Lakes And Country Realty LLC | | Oil Operator | Mar 2015 |
| 4 | Lakewood Petroleum | | Oil & Gas Operator | Sep 1993 |
| 5 | Lambda Energy Resources LLC | | Oil & Gas Operator | Oct 2025 |
| 6 | Lanphars Inc | | Gas Operator | Dec 1985 |
| 7 | Lawrence Exploration Inc | | Oil & Gas Operator | Sep 2004 |
| 8 | Layline Oil And Gas LLC | Marion, MI 49665 | Oil & Gas Operator | Sep 2025 |
| 9 | Lease Management Inc | | Oil & Gas Operator | Aug 2025 |
| 10 | Lease Management Inc And McClure Oil Co | | Oil & Gas Operator | Apr 1991 |
| 11 | Lease Management Inc And Patrick Petroleum Corp | | Oil & Gas Operator | Apr 1991 |
| 12 | Lees Petroleum LLC | | Oil & Gas Operator | Jul 2000 |
| 13 | Lignum Oil Co | | Oil & Gas Operator | Dec 1989 |
| 14 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Jun 2025 |
| 15 | Lithos Exploration Inc | | Oil & Gas Operator | Nov 2014 |
| 16 | Loe Petroleum & Environmental Engineering LLC | | Oil Operator | Oct 2025 |
| 17 | Lomak Petroleum Michigan Inc | | Gas Operator | Jul 1992 |
| 18 | Long Jack Senior | | Oil Operator | Jan 2004 |
| 19 | Lorenz Robert M | | Oil & Gas Operator | Oct 1984 |
| 20 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 21 | Lucas George C | | Oil Operator | Jul 2014 |
| 22 | Luchshyn Harry E And Dannemiller William F | | Oil & Gas Operator | Dec 1994 |
| 23 | Lyco Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jun 2015 |