| 1 | Lackey Raymond R | Lindsay, OK 73052 | Oil & Gas Operator | Jun 2015 |
| 2 | Lackey Raymond R & Assoc | Sulphur, OK 73086 | Oil & Gas Operator | Apr 2025 |
| 3 | Laguna Petroleum Corporation | Houston, TX 77046 | Oil & Gas Operator | Jun 2025 |
| 4 | Lakeshore Operating, LLC | Wichita, KS 67203 | Oil & Gas Operator | Jun 2025 |
| 5 | Lamamco Drilling Company | Skiatook, OK 74070 | Oil & Gas Operator | Mar 2025 |
| 6 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | Apr 2025 |
| 7 | Landers & Musgrove | Okemah, OK 74859 | Oil & Gas Operator | Mar 2015 |
| 8 | Landers & Waldman Inc | Okemah, OK 74859-0660 | Oil & Gas Operator | May 2013 |
| 9 | Landmark Energy LLC | Seminole, OK 74868 | Oil & Gas Operator | Apr 2025 |
| 10 | Lapetco Inc | Plano, TX 75093 | Oil & Gas Operator | Aug 2024 |
| 11 | Lariat Petroleum Inc | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2024 |
| 12 | Larkspur Operating LLC | Oklahoma City, OK 73034 | Oil & Gas Operator | Apr 2025 |
| 13 | Larry Wolff Dba Wolff'S Oilfield Service | Cushing, OK 74023-9789 | Oil & Gas Operator | Mar 2025 |
| 14 | Las Colinas Oil Corp. | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 15 | Lauck & Associates | Walnut Creek, CA 91789 | Oil & Gas Operator | Jan 2025 |
| 16 | Laughlin Jack D | Cushing, OK 74023 | Oil & Gas Operator | Sep 2016 |
| 17 | Laurel Operating Company, Inc. | Stillwater, OK 74074-3025 | Oil & Gas Operator | Apr 2025 |
| 18 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 19 | Leavell Resources Corporation | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 20 | Leeman Energy Corporation | Oklahoma City, OK 73118-1802 | Oil & Gas Operator | Mar 2015 |
| 21 | Legacy - M & K Corporation | Dallas, TX 75231-0969 | Oil & Gas Operator | Jan 2025 |
| 22 | Legacy Energy Services LLC | Stillwater, OK 74074 | Oil & Gas Operator | Apr 2025 |
| 23 | Legend Energy Corporation | Stillwater, OK 74074-1721 | Oil & Gas Operator | Aug 2022 |
| 24 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 25 | Lema Petroleum Inc | Seminole, OK 74868 | Oil & Gas Operator | Mar 2025 |
| 26 | Levinson Partners Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 1995 |
| 27 | Lewis Oil Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Mar 2025 |
| 28 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Dec 2024 |
| 29 | Lion Petroleum Company | Oklahoma City, OK 73120-4503 | Oil & Gas Operator | Aug 2015 |
| 30 | Little Oil Company LLC | Cushing, OK 74023 | Oil Operator | Mar 2025 |
| 31 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Mar 2025 |
| 32 | Little Thunder, LLC | Bartlesville, OK 74003 | Oil Operator | Mar 2025 |
| 33 | Lo-Jel Energy LLC | Oklahoma City, OK 73162-7418 | Oil & Gas Operator | Nov 2019 |
| 34 | Loki Oil LLC | Cushing, OK 74023 | Oil & Gas Operator | Nov 2024 |
| 35 | Lord Enterprises Inc | Oklahoma City, OK 73106-5050 | Oil & Gas Operator | Sep 2000 |
| 36 | Lovell Keith | Stillwater, OK 74074-6459 | Oil & Gas Operator | Jan 2020 |
| 37 | Lu-Ray Petroleum LLC | Oklahoma City, OK 73121-1607 | Oil & Gas Operator | Apr 2025 |
| 38 | Lucky Ace Petroleum LLC | Carrollton, TX 75010-4232 | Oil Operator | Oct 2021 |
| 39 | Luther Oil Inc | Cameron Park, CA 95682-8865 | Oil & Gas Operator | Apr 2020 |
| 40 | LVM Oil Production LLC | Yale, OK 74085-6688 | Oil & Gas Operator | Jul 2021 |