| 1 | L & N Exploration Inc | | Oil & Gas Operator | Jul 2013 |
| 2 | Ladder Energy Company | Tulsa, OK 74120-4281 | Oil & Gas Operator | Jan 2018 |
| 3 | Lamamco Drilling Company | Skiatook, OK 74070 | Oil & Gas Operator | Feb 2026 |
| 4 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | Mar 2026 |
| 5 | Landers & Musgrove | Okemah, OK 74859 | Oil & Gas Operator | Mar 2015 |
| 6 | Landers & Musgrove Oil Co. Inc | Okemah, OK 74859-0266 | Oil & Gas Operator | Jan 2018 |
| 7 | Landers & Waldman Inc | Okemah, OK 74859-0660 | Oil & Gas Operator | May 2013 |
| 8 | Landers Oil & Gas Inc | Tulsa, OK 74132-2171 | Oil & Gas Operator | Feb 2026 |
| 9 | Lar-Mie Petroleum Inc | Tulsa, OK 74136 | Oil & Gas Operator | Aug 1998 |
| 10 | Larkspur Operating LLC | Oklahoma City, OK 73106 | Oil & Gas Operator | Feb 2026 |
| 11 | Larry Sherman Oil LLC | Chandler, OK 74834 | Oil & Gas Operator | Mar 2026 |
| 12 | Larry Wolff Dba Wolff'S Oilfield Service | Cushing, OK 74023-9789 | Oil & Gas Operator | Feb 2026 |
| 13 | Las Colinas Oil Corp. | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 14 | Laurel Operating Company | Stillwater, OK 74074-3025 | Oil & Gas Operator | Feb 2026 |
| 15 | Lawrence James LLC | Guthrie, OK 73044-9622 | Oil & Gas Operator | Feb 2026 |
| 16 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 17 | Leasehold Management Corp | Oklahoma City, OK 73107 | Oil & Gas Operator | Nov 2024 |
| 18 | Leavell Resources Corporation | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 19 | Legacy - M & K Corporation | Dallas, TX 75231-0969 | Oil & Gas Operator | Jan 2025 |
| 20 | Lewis Oil Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Feb 2026 |
| 21 | Lewis, R. J. Oil Company | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2014 |
| 22 | Lincoln Transportation Inc | Stroud, OK 74079 | Oil & Gas Operator | Feb 2026 |
| 23 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Jun 2025 |
| 24 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Mar 2026 |
| 25 | Little Thunder, LLC | Bartlesville, OK 74003 | Oil Operator | Feb 2026 |
| 26 | Lobar Oil Co LLC | Edmond, OK 73013 | Oil & Gas Operator | Feb 2026 |
| 27 | Lord Enterprises Inc | Oklahoma City, OK 73106-5050 | Oil & Gas Operator | Sep 2000 |
| 28 | Lre Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2016 |
| 29 | Lu-Ray Petroleum LLC | Oklahoma City, OK 73121-1607 | Oil & Gas Operator | Mar 2026 |
| 30 | Lunar Investments Inc | Oklahoma City, OK 73118-4823 | Oil & Gas Operator | Feb 2026 |
| 31 | Luther Oil Inc | Cameron Park, CA 95682-8865 | Oil & Gas Operator | Apr 2020 |
| 32 | Luween Energy LLC | Oklahoma City, OK 73128 | Oil & Gas Operator | Feb 2026 |