| 1 | K Me Company, LLC | Kilgore, TX 75663 | Oil Operator | Feb 2026 |
| 2 | K-M Oil Company, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Feb 2026 |
| 3 | K.M.A. Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 4 | Kabco Oil & Gas Company | Longview, TX 75604 | Oil & Gas Operator | Jun 2018 |
| 5 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Feb 2026 |
| 6 | Kalos Corporation | Tyler, TX 75701 | Oil & Gas Operator | Feb 2026 |
| 7 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 8 | Keith Petroleum Corporation | Houston, TX 77063 | Oil & Gas Operator | Jan 1993 |
| 9 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Sep 2025 |
| 10 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 11 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 12 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Nov 2025 |
| 13 | Keyway Oil & Gas Operating LLC | Kilgore, TX 75663 | Oil Operator | Oct 2020 |
| 14 | Killingsworth, Lee Operator | Longview, TX 75601 | Oil & Gas Operator | Jan 1999 |
| 15 | King Operating Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Feb 2026 |
| 16 | Kiva Resources Inc. | Houston, TX 77265 | Oil & Gas Operator | Mar 2008 |
| 17 | Krog Partners, LLC | Kilgore, TX 75663 | Oil Operator | Feb 2026 |