| 1 | Lackey Raymond R & Assoc | Sulphur, OK 73086 | Oil & Gas Operator | Jan 2025 |
| 2 | Lambert Oil & Gas LLC | Holdenville, OK 74848-4707 | Oil & Gas Operator | Nov 2024 |
| 3 | Lancer Energy Corporation | Oklahoma City, OK 73132-5903 | Oil & Gas Operator | May 2015 |
| 4 | Landers & Musgrove | Okemah, OK 74859 | Oil & Gas Operator | Mar 2015 |
| 5 | Landers & Musgrove Oil Co. Inc | Okemah, OK 74859-0266 | Oil & Gas Operator | Jan 2018 |
| 6 | Landers Oil & Gas Inc | Tulsa, OK 74132-2171 | Oil & Gas Operator | Jan 2025 |
| 7 | Langham Petroleum Expl. Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 2009 |
| 8 | Lariat Petroleum Inc | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2024 |
| 9 | Lavrco Energie Inc | Duncan, OK 73533 | Oil & Gas Operator | Oct 2024 |
| 10 | Lefco Resources LLC | Henryetta, OK 74437 | Gas Operator | Jan 2025 |
| 11 | Lerblance Jr W P Estate | Hartshorne, OK 74547-0449 | Oil & Gas Operator | Apr 2020 |
| 12 | Lime Rock Resources A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2025 |
| 13 | Lime Rock Resources IV-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 14 | Lincoln Rock Corporation | Northfield, IL 60093 | Oil & Gas Operator | Jul 2003 |
| 15 | Loki Oil LLC | Cushing, OK 74023 | Oil & Gas Operator | Nov 2024 |
| 16 | Long Production LLC | Claremore, OK 74017-2808 | Oil & Gas Operator | Oct 2019 |
| 17 | Longacre Oil & Gas | Enid, OK 73702 | Oil & Gas Operator | Mar 2013 |
| 18 | Longberry Energy Inc | Keota, OK 74941 | Gas Operator | Jan 2025 |
| 19 | Louis Dreyfus Gas Marketing | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2018 |
| 20 | Lubell Oil Company | Tulsa, OK 74103 | Gas Operator | Jul 1993 |
| 21 | LXS Inc | Stigler, OK 74462-0506 | Gas Operator | Nov 2013 |
| 22 | Lyons & Lyons Inc | Tulsa, OK 74119 | Oil & Gas Operator | Jan 2025 |