| 1 | J & M Oil Co | Overland PK, KS 66209 | Oil & Gas Operator | Sep 2025 |
| 2 | J-Brex Company | Amarillo, TX 79101 | Oil & Gas Operator | Feb 2026 |
| 3 | Jack Exploration Inc | Sulphur, OK 73086 | Oil & Gas Operator | Oct 2017 |
| 4 | Jackson Exploration Inc | Dallas, TX 75225 | Oil & Gas Operator | Aug 2005 |
| 5 | Jackson Oilfield Service Inc | Purcell, OK 73080-4357 | Oil & Gas Operator | Jan 2021 |
| 6 | James Petroleum Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2014 |
| 7 | Jay Petroleum Inc | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | Mar 2019 |
| 8 | JCR, Jr - Operating, Inc. | Amarillo, TX 79114 | Oil & Gas Operator | Apr 2022 |
| 9 | Jec Operating LLC | Oklahoma City, OK 73114-2717 | Oil & Gas Operator | Nov 2025 |
| 10 | Jeff Jensen Properties Inc | | Oil & Gas Operator | Mar 2014 |
| 11 | Jefferson Co LLC (The) | Corinth, TX 76205 | Oil & Gas Operator | Aug 2004 |
| 12 | Jegeroil Corp | New York, NY 10036 | Oil & Gas Operator | Aug 2000 |
| 13 | Jet Oil Co12/Ofb See 18649 | | Oil & Gas Operator | Jul 2007 |
| 14 | Jhatco Inc | Enid, OK 73701 | Oil & Gas Operator | Dec 2025 |
| 15 | Jimgas Inc | Magnolia, TX 77355 | Oil & Gas Operator | May 2016 |
| 16 | JKB Resources LLC | Stigler, OK 74462 | Oil & Gas Operator | Dec 2025 |
| 17 | Jma Energy Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2025 |
| 18 | Johnson Exploration Company | Oklahoma City, OK 73102-7008 | Oil & Gas Operator | Jun 2015 |
| 19 | Jones & Pellow Oil Co | Oklahoma City, OK 73118-1115 | Oil & Gas Operator | Feb 2015 |
| 20 | Jones Energy, LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2025 |
| 21 | JTL Operating Co Inc | Katy, TX 77450 | Oil & Gas Operator | Feb 2026 |