| 1 | L And R Oil Company | Oakley, KS 67748 | Oil & Gas Operator | Jan 2004 |
| 2 | Lake Country Disposal II LLC | | Oil Operator | Jan 2024 |
| 3 | Lake Country Disposal LLC | | Oil Operator | Jan 2024 |
| 4 | Lakeland Pipeline Inc | Hominy, OK 74035-1006 | Oil & Gas Operator | Jun 2023 |
| 5 | Lamberton Oil Co Inc | Tulsa, OK 74107 | Oil & Gas Operator | May 2013 |
| 6 | Lamberton W J | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2015 |
| 7 | Lapetco Inc | Plano, TX 75093 | Oil & Gas Operator | Feb 2024 |
| 8 | Laredo Petroleum, Inc. | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2023 |
| 9 | Lariat Energy & Supply Co Inc | Hulbert, OK 74441-0735 | Oil & Gas Operator | Feb 2024 |
| 10 | Lasmo Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2011 |
| 11 | Laurel Operating Company, Inc. | Stillwater, OK 74074-3025 | Oil & Gas Operator | Jan 2024 |
| 12 | Layco Oil | Okmulgee, OK 74447-2065 | Oil & Gas Operator | Apr 2020 |
| 13 | LBJ Production Inc | Okmulgee, OK 74447 | Oil Operator | Nov 1998 |
| 14 | Leasehold Management Corp | Oklahoma City, OK 73109-6925 | Oil & Gas Operator | Jan 2024 |
| 15 | Leatherneck Energy Group Inc | Addison, TX 75001-6025 | Oil & Gas Operator | Apr 2020 |
| 16 | Lee Jr W E | Beggs, OK 74421-2683 | Oil & Gas Operator | May 2013 |
| 17 | Leeman Energy Corporation | Oklahoma City, OK 73118-1802 | Oil & Gas Operator | Mar 2015 |
| 18 | Leg Up Operating Company LLC | | Oil Operator | Jan 2024 |
| 19 | Lerblance Jr W P Estate | Hartshorne, OK 74547-0449 | Oil & Gas Operator | Apr 2020 |
| 20 | Levinson Silvan E | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2012 |
| 21 | Lewis Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jul 1995 |
| 22 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Mar 2022 |
| 23 | Likins-Foster Honolulu Corp | Foster City, CA 94404 | Oil & Gas Operator | Feb 2015 |
| 24 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Feb 2024 |
| 25 | Litsey Exploration LLC | | Oil & Gas Operator | Dec 2023 |
| 26 | Little Chicago Oil & Gas Inc | Edmond, OK 73034-0809 | Oil & Gas Operator | Dec 2017 |
| 27 | Little River Energy Co. | Drumright, OK 74030 | Oil & Gas Operator | Jan 2024 |
| 28 | Longhurst Oil & Gas Inc | | Oil & Gas Operator | Nov 2013 |
| 29 | Loving Company (The) | Broken Arrow, OK 74014-0001 | Oil & Gas Operator | May 2013 |
| 30 | Lunar Investments Inc | Oklahoma City, OK 73118-4823 | Oil & Gas Operator | Jan 2024 |
| 31 | LX4 LLC | | Oil Operator | Jan 2024 |
| 32 | Lyric Energy, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Mar 1996 |