| 1 | L D & Associates | Broken Arrow, OK 74014-1712 | Oil Operator | Feb 2012 |
| 2 | Lake Country Disposal II LLC | | Oil Operator | Jan 2024 |
| 3 | Lake Country Disposal LLC | | Oil Operator | Jan 2024 |
| 4 | Lakeland Pipeline Inc | Hominy, OK 74035-1006 | Oil & Gas Operator | Jun 2023 |
| 5 | Langham Petroleum Expl. Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 2009 |
| 6 | Larkin Energy Company Inc | Sasakwa, OK 74867-0006 | Oil & Gas Operator | May 2022 |
| 7 | Larkin Oil Co | Sasakwa, OK 74867 | Oil & Gas Operator | Aug 2015 |
| 8 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 9 | Lewis John L Well Service | Sasakwa, OK 74867-0067 | Oil Operator | May 2013 |
| 10 | Lewis Oil Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Jan 2024 |
| 11 | Lewis Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jul 1995 |
| 12 | Lewis, R. J. Oil Company | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2014 |
| 13 | Likins-Foster Honolulu Corp | Foster City, CA 94404 | Oil & Gas Operator | Feb 2015 |
| 14 | Little River Energy Co. | Drumright, OK 74030 | Oil & Gas Operator | Jan 2024 |
| 15 | Loving Company (The) | Broken Arrow, OK 74014-0001 | Oil & Gas Operator | May 2013 |
| 16 | LX4 LLC | | Oil Operator | Jan 2024 |