| 1 | Lakeland Pipeline Inc | Hominy, OK 74035-1006 | Oil & Gas Operator | Jun 2023 |
| 2 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | Jul 2025 |
| 3 | Landers & Musgrove | Okemah, OK 74859 | Oil & Gas Operator | Mar 2015 |
| 4 | Landers & Musgrove Oil Co. Inc | Okemah, OK 74859-0266 | Oil & Gas Operator | Jan 2018 |
| 5 | Landers & Waldman Inc | Okemah, OK 74859-0660 | Oil & Gas Operator | May 2013 |
| 6 | Las Colinas Oil Corp. | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 7 | Laurel Operating Company, Inc. | Stillwater, OK 74074-3025 | Oil & Gas Operator | Jun 2025 |
| 8 | Lawrence Roy Drilling Co Inc | Pawnee, OK 74058-0306 | Oil & Gas Operator | Aug 2000 |
| 9 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 10 | Lerblance Jr W P Estate | Hartshorne, OK 74547-0449 | Oil & Gas Operator | Apr 2020 |
| 11 | Levinson Silvan E | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2012 |
| 12 | Lewbet Inc | Perry, OK 73077 | Oil & Gas Operator | Aug 2024 |
| 13 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Dec 2024 |
| 14 | Lincoln 77, Inc. | Chanute, KS 66720 | Oil Operator | Dec 2001 |
| 15 | Little Oil Company LLC | Cushing, OK 74023 | Oil Operator | Jun 2025 |
| 16 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Jun 2025 |
| 17 | Little Thunder, LLC | Bartlesville, OK 74003 | Oil Operator | Jun 2025 |
| 18 | Lowe Kenneth | Jennings, OK 74038 | Oil & Gas Operator | May 2025 |