| 1 | K M Gas Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Dec 2014 |
| 2 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2024 |
| 3 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Jan 2024 |
| 4 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 5 | KCS Resources, LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2017 |
| 6 | Kechi Energy LLC | Chickasha, OK 73023-1433 | Oil & Gas Operator | Feb 2024 |
| 7 | Kenneth W. Cory, LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Feb 2024 |
| 8 | Kerr McGee Rocky MTN Corp | Denver, CO 80202-5736 | Oil & Gas Operator | Mar 2015 |
| 9 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Sep 2023 |
| 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 | Apr 2024 |
| 12 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2024 |
| 13 | King Energy LLC | Oklahoma City, OK 73116-9044 | Oil & Gas Operator | Feb 2024 |
| 14 | Kingfisher Resources Inc | Clinton, OK 73601-1237 | Oil & Gas Operator | Feb 2024 |
| 15 | Kirkpatrick Oil Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2024 |
| 16 | KNG Producers | Dumas, TX 79029 | Oil & Gas Operator | Oct 2009 |
| 17 | Koch Midstream Services Company | Wichita, KS 67201 | Oil & Gas Operator | Oct 2000 |
| 18 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 19 | KT Energy Inc | Enid, OK 73702-2365 | Oil & Gas Operator | Jan 2024 |
| 20 | Kybenco Disposals LLC | | Oil Operator | Sep 2022 |