| 1 | K & F Oil Co. | Olney, TX 76374 | Oil & Gas Operator | Dec 2021 |
| 2 | K S Oil Company Inc | Norman, OK 73072-7480 | Oil & Gas Operator | Sep 2025 |
| 3 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2025 |
| 4 | Kanokla Oil & Gas Corporation | Wellington, KS 67152-0444 | Oil & Gas Operator | Aug 2025 |
| 5 | Kato Operating Company | Bristow, OK 74010 | Oil & Gas Operator | Mar 2015 |
| 6 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Aug 2025 |
| 7 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 8 | Keener Energy Company | Tulsa, OK 74103-4043 | Oil & Gas Operator | Jan 2014 |
| 9 | Keith F Walker Oil & Gas Company LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2025 |
| 10 | Kelloil Inc | Fort Worth, TX 76116-5600 | Oil & Gas Operator | Mar 2015 |
| 11 | Ken Snyder Inc | Newalla, OK 74857-7107 | Oil & Gas Operator | Aug 2025 |
| 12 | Kennedy & Mitchell, Inc. | Houston, TX 77084 | Oil & Gas Operator | Aug 2013 |
| 13 | Kenneth W Cory LTD | Bellaire, TX 77401 | Oil & Gas Operator | Aug 2025 |
| 14 | Kerr McGee Rocky MTN Corp | Denver, CO 80202-5736 | Oil & Gas Operator | Mar 2015 |
| 15 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Aug 2025 |
| 16 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 17 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 18 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2025 |
| 19 | Kile Production | Cypress, TX 77410 | Oil & Gas Operator | Aug 2014 |
| 20 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 21 | Kimbark Oil & Gas Company | Denver, CO 80203 | Oil & Gas Operator | May 2007 |
| 22 | King Operating Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Dec 2025 |
| 23 | Kingery Drilling Co., Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Sep 2025 |
| 24 | Kirk David | Midland, TX 79705 | Oil & Gas Operator | Aug 2025 |
| 25 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Dec 2025 |
| 26 | Klingensmith Fred T Etal | Sapulpa, OK 74066 | Oil & Gas Operator | Nov 2007 |
| 27 | Klo LLC | Tulsa, OK 74120-2428 | Oil & Gas Operator | Sep 2025 |
| 28 | KN Production Company | Lakewood, CO 80228 | Oil & Gas Operator | Jun 2003 |
| 29 | Knutson Production Company | Loco, OK 73442-9706 | Oil & Gas Operator | Aug 2025 |
| 30 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 31 | Kodiak Oil & Gas Inc | Muenster, TX 76252 | Oil & Gas Operator | Dec 2025 |
| 32 | KRS Oil Company | Frisco, TX 75034 | Oil & Gas Operator | Apr 2020 |
| 33 | KT Energy Inc | Enid, OK 73702-2365 | Oil & Gas Operator | Aug 2025 |