| 1 | L & N Exploration Inc | | Oil & Gas Operator | Jul 2013 |
| 2 | L E Jones Operating Inc | Duncan, OK 73534 | Oil & Gas Operator | Dec 2024 |
| 3 | Lamamco Drilling Company | Skiatook, OK 74070 | Oil & Gas Operator | Nov 2024 |
| 4 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | Dec 2024 |
| 5 | Lancer Energy Corporation | Oklahoma City, OK 73132-5903 | Oil & Gas Operator | May 2015 |
| 6 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Mar 2025 |
| 7 | Las Colinas Oil Corp. | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 8 | Laurel Operating Company, Inc. | Stillwater, OK 74074-3025 | Oil & Gas Operator | Nov 2024 |
| 9 | Lawrence James Oil Prop Inc | Catoosa, OK 74015 | Oil & Gas Operator | Feb 2012 |
| 10 | LCB Resources LLC | Kingfisher, OK 73750-2322 | Oil & Gas Operator | Dec 2024 |
| 11 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 12 | Leasehold Management Corp | Oklahoma City, OK 73170 | Oil & Gas Operator | Nov 2024 |
| 13 | Leeman Energy Corporation | Oklahoma City, OK 73118-1802 | Oil & Gas Operator | Mar 2015 |
| 14 | Legacy - M & K Corporation | Dallas, TX 75231-0969 | Oil & Gas Operator | Nov 2024 |
| 15 | Legacy Energy Services LLC | Stillwater, OK 74074 | Oil & Gas Operator | Nov 2024 |
| 16 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Mar 2025 |
| 17 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 18 | Lewis Oil Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Nov 2024 |
| 19 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Mar 2022 |
| 20 | Likins-Foster Honolulu Corp | Foster City, CA 94404 | Oil & Gas Operator | Feb 2015 |
| 21 | Lime Rock Resources II-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 22 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Aug 2024 |
| 23 | Lion Petroleum Company | Oklahoma City, OK 73120-4503 | Oil & Gas Operator | Aug 2015 |
| 24 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Nov 2024 |
| 25 | Littrell Chemical Inc | Cleo Springs, OK 73729 | Oil & Gas Operator | Jan 2005 |
| 26 | Lobar Oil Co LLC | Oklahoma City, OK 73116-1516 | Oil & Gas Operator | Nov 2024 |
| 27 | Lobo Energy, Inc. | Laredo, TX 78044 | Oil & Gas Operator | Nov 1996 |
| 28 | Locators Oil And Gas Inc | Guthrie, OK 73044 | Oil & Gas Operator | Oct 2022 |
| 29 | London William W | Oklahoma City, OK 73116 | Oil & Gas Operator | Nov 2015 |
| 30 | London William W Inc | Oklahoma City, OK 73116-5116 | Oil & Gas Operator | Apr 2016 |
| 31 | Long Engineering Company Inc | Oklahoma City, OK 73112-7769 | Oil Operator | Jun 2008 |
| 32 | Longbranch Oil Company | Oklahoma City, OK 73154-0735 | Oil & Gas Operator | Mar 2018 |
| 33 | Lord Enterprises Inc | Oklahoma City, OK 73106-5050 | Oil & Gas Operator | Sep 2000 |
| 34 | Lu-Ray Petroleum LLC | Oklahoma City, OK 73121-1607 | Oil & Gas Operator | Dec 2024 |
| 35 | Luween Energy LLC | Palisade, CO 81526 | Oil & Gas Operator | Nov 2024 |