| 1 | L & F Oil Company | Duncan, OK 73533-3636 | Oil Operator | Jun 2009 |
| 2 | L And L Production Company | Skellytown, TX 79080 | Oil & Gas Operator | Sep 1996 |
| 3 | L E Jones Operating Inc | Duncan, OK 73534 | Oil & Gas Operator | Oct 2024 |
| 4 | Lakota Oil & Gas | Comanche, OK 73529-9602 | Oil & Gas Operator | May 2014 |
| 5 | Lamamco Drilling Company | Skiatook, OK 74070 | Oil & Gas Operator | Sep 2024 |
| 6 | Lambert Company LLC | Healdton, OK 73438-0962 | Oil & Gas Operator | Sep 2024 |
| 7 | Lambert Company The | Healdton, OK 73438-0962 | Oil & Gas Operator | Feb 2023 |
| 8 | Lamberton W J | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2015 |
| 9 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | Oct 2024 |
| 10 | Lariat Petroleum Inc | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2024 |
| 11 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Dec 2024 |
| 12 | Larson Exploration Company | Tulsa, OK 74136-4939 | Oil & Gas Operator | Jul 2016 |
| 13 | Lasmo Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2024 |
| 14 | Latigo Drilling Corporation | Duncan, OK 73533 | Oil & Gas Operator | Sep 2024 |
| 15 | Latigo Oil And Gas Inc | Woodward, OK 73801 | Oil & Gas Operator | Oct 2024 |
| 16 | Lavrco Energie Inc | Duncan, OK 73533 | Oil & Gas Operator | Oct 2024 |
| 17 | Lawrence Hot Oil Service | Loco, OK 73442 | Oil & Gas Operator | Oct 2024 |
| 18 | LCB Resources LLC | Kingfisher, OK 73750-2322 | Oil & Gas Operator | Sep 2024 |
| 19 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 20 | Le Norman Partners LLC | Duncan, OK 73533-9523 | Oil & Gas Operator | Feb 2012 |
| 21 | Ledford Jan Oil & Gas | Duncan, OK 73533-3210 | Oil Operator | Jun 2024 |
| 22 | Lee Jr W E | Beggs, OK 74421-2683 | Oil & Gas Operator | May 2013 |
| 23 | Lee Ron | Emory, TX 75440 | Oil Operator | Sep 2024 |
| 24 | Leed Energy LLC | Purcell, OK 73080-1383 | Oil & Gas Operator | Sep 2024 |
| 25 | Lewis J K | Duncan, OK 73534-1742 | Oil & Gas Operator | Apr 2015 |
| 26 | Lewis Oil Operations LLC | Ratliff City, OK 73481 | Oil & Gas Operator | Sep 2024 |
| 27 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Mar 2022 |
| 28 | Likins-Foster Honolulu Corp | Foster City, CA 94404 | Oil & Gas Operator | Feb 2015 |
| 29 | Lil Dab Petroleum Inc | Duncan, OK 73533 | Oil Operator | Oct 2024 |
| 30 | Lime Rock Resources A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2024 |
| 31 | Lime Rock Resources II-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2024 |
| 32 | Linam Harry Dba Sooner State Production | Marlow, OK 73055-0583 | Oil & Gas Operator | Apr 2015 |
| 33 | Little O Oil Company | Velma, OK 73091-0425 | Oil & Gas Operator | Apr 2015 |
| 34 | Loco Oil Company | Loco, OK 73442 | Oil Operator | Feb 1993 |
| 35 | Longacre Oil & Gas | Enid, OK 73702 | Oil & Gas Operator | Mar 2013 |
| 36 | Lowry Exploration Inc | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2024 |
| 37 | Loyalty Production, LLC | Marlow, OK 73055 | Oil Operator | Sep 2024 |
| 38 | Lucky Oil Company | Comanche, OK 73529-0009 | Oil Operator | Jul 2024 |
| 39 | Luther Oil Inc | Cameron Park, CA 95682-8865 | Oil & Gas Operator | Apr 2020 |
| 40 | Lynan Energy Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | May 2013 |