| 1 | L & G Petroleum Operating, LLC | Havana, KS 67347 | Oil Operator | Jun 2025 |
| 2 | L & H Energy Inc | Cherryvale, KS 67335 | Oil & Gas Operator | Sep 2019 |
| 3 | L & L Producers | Independnce, KS 67301 | Oil Operator | Aug 2025 |
| 4 | L&L Oil Company LLC | Copan, OK 74022-4608 | Oil Operator | Mar 2014 |
| 5 | L.L. Oil Company | Freer, TX 78357 | Oil & Gas Operator | Dec 2025 |
| 6 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 7 | Lakeland Pipeline Inc | Hominy, OK 74035-1006 | Oil & Gas Operator | Jun 2023 |
| 8 | Lamamco Drilling Company | Skiatook, OK 74070 | Oil & Gas Operator | Aug 2025 |
| 9 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | Sep 2025 |
| 10 | Larkin Energy Company Inc | Sasakwa, OK 74867 | Oil & Gas Operator | May 2022 |
| 11 | Larmore Jr James E | Bartlesville, OK 74006-8312 | Oil Operator | Mar 2017 |
| 12 | Laurco Energies,Inc | | Oil & Gas Operator | May 2025 |
| 13 | Legacy Petroleum LLC | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2025 |
| 14 | Leonard Brothers Operating Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Dec 2025 |
| 15 | Lewis A. Hembree Production Company | Shawnee, OK 74801 | Oil & Gas Operator | Aug 2025 |
| 16 | Limestone Productions | Bartlesville, OK 74006-8229 | Oil & Gas Operator | Sep 2013 |
| 17 | Lincoln Rock Corporation | Northfield, IL 60093 | Oil & Gas Operator | Jul 2003 |
| 18 | Lowe Kenneth | Jennings, OK 74038 | Oil & Gas Operator | May 2025 |
| 19 | Lucre Oil Company | Muskogee, OK 74401-5099 | Oil & Gas Operator | Jun 2019 |
| 20 | LX4, LLC | Laverne, OK 73848 | Oil Operator | Sep 2025 |