| 1 | L.E. Jones Operating, Inc. | Duncan, OK 73534 | Oil & Gas Operator | Aug 2025 |
| 2 | Lackey Raymond R | Lindsay, OK 73052 | Oil & Gas Operator | Jun 2015 |
| 3 | Lackey Raymond R & Assoc | Sulphur, OK 73086 | Oil & Gas Operator | Jun 2025 |
| 4 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 5 | Ladder Energy Company | Tulsa, OK 74120-4281 | Oil & Gas Operator | Jan 2018 |
| 6 | Laguna Petroleum Corporation | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 7 | Lam Financial Holdings LTD | Greenwood VIllage, CO 80111 | Oil Operator | Jul 2025 |
| 8 | Lambdin William H | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 1998 |
| 9 | Lambert Company LLC | Healdton, OK 73438-0962 | Oil & Gas Operator | Jun 2025 |
| 10 | Lambert Company The | Healdton, OK 73438-0962 | Oil & Gas Operator | Feb 2023 |
| 11 | Lamima Corporation | Ardmore, OK 73401 | Oil Operator | Nov 1994 |
| 12 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | Jul 2025 |
| 13 | Landmark Exploration Co | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2013 |
| 14 | Landmark Production Company | MC Gregor, TX 76657 | Oil & Gas Operator | Oct 2010 |
| 15 | Langley Harold | Graham, OK 73437 | Oil Operator | Jun 2025 |
| 16 | Lapetco Inc | Plano, TX 75093 | Oil & Gas Operator | Aug 2024 |
| 17 | Lariat Petroleum Inc | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2024 |
| 18 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Oct 2025 |
| 19 | Larkin Energy Company Inc | Sasakwa, OK 74867 | Oil & Gas Operator | May 2022 |
| 20 | Larkin Oil Co | Sasakwa, OK 74867 | Oil & Gas Operator | Aug 2015 |
| 21 | Lasmo Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2024 |
| 22 | Latigo Drilling Corporation | Duncan, OK 73533 | Oil & Gas Operator | Jun 2025 |
| 23 | Laurco Energies,Inc | | Oil & Gas Operator | May 2025 |
| 24 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 25 | Le Norman Partners LLC | Duncan, OK 73533-9523 | Oil & Gas Operator | Feb 2012 |
| 26 | Leasehold Management Corp | Oklahoma City, OK 73107 | Oil & Gas Operator | Nov 2024 |
| 27 | Lee Energy Exploration LTD | Oklahoma City, OK 73102-7114 | Oil & Gas Operator | Jul 2008 |
| 28 | Leed Energy LLC | Purcell, OK 73080-1383 | Oil & Gas Operator | Jun 2025 |
| 29 | Leeman Don J | Oklahoma City, OK 73112 | Oil & Gas Operator | Sep 1998 |
| 30 | Leeman Energy Corporation | Oklahoma City, OK 73118-1802 | Oil & Gas Operator | Mar 2015 |
| 31 | Lemley Oil Corporation | Sulphur, OK 73086-9316 | Oil & Gas Operator | Jan 2025 |
| 32 | Lewis J K | Duncan, OK 73534-1742 | Oil & Gas Operator | Apr 2015 |
| 33 | Lewis John L Well Service | Sasakwa, OK 74867 | Oil Operator | May 2013 |
| 34 | Lewis Oil Operations LLC | Ratliff City, OK 73481 | Oil & Gas Operator | Jun 2025 |
| 35 | Lime Rock Resources II-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 36 | Lincoln Rock Corporation | Northfield, IL 60093 | Oil & Gas Operator | Jul 2003 |
| 37 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Jun 2025 |
| 38 | Little O Oil Company | Velma, OK 73091-0425 | Oil & Gas Operator | Apr 2015 |
| 39 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Jun 2025 |
| 40 | Longfellow Energy, LP | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 41 | Lucky Ace Petroleum LLC | Carrollton, TX 75010-4232 | Oil Operator | Oct 2021 |
| 42 | Lucky Oil Company | Comanche, OK 73529-0009 | Oil Operator | Dec 2024 |