| 1 | K & D Energy | | Oil Operator | Dec 2018 |
| 2 | K-B Oil Company | Dallas, TX 75243 | Oil & Gas Operator | Dec 2020 |
| 3 | K. Petroleum, Inc. | Gahanna, OH 43230 | Oil & Gas Operator | Aug 2025 |
| 4 | Kanik, Anthony S Dba Kanik Oil Co | McLeansboro, IL 62859 | Oil Operator | Dec 2023 |
| 5 | Kelcas Well Services LTD | Owensboro, KY 42303 | Oil Operator | Dec 2021 |
| 6 | Kellous Oil, Inc | | Oil Operator | Dec 2013 |
| 7 | Kelly Energy Co, Inc | Henderson, KY 42420 | Oil Operator | Dec 2022 |
| 8 | Kendall-Davis DRLG Co, Inc | | Oil Operator | Dec 2023 |
| 9 | Keneco, Inc | | Oil & Gas Operator | Dec 2018 |
| 10 | Kenneth R Ingle Associates Inc | | Oil Operator | Dec 2023 |
| 11 | Kentucky Exploration LLC | Lexington, KY 40509 | Oil & Gas Operator | Dec 2014 |
| 12 | Kentucky Gas Development, LLC | | Oil & Gas Operator | Dec 2020 |
| 13 | Kentucky Petroleum Operating, LTD | | Oil & Gas Operator | Dec 2017 |
| 14 | Key Oil Company | Duncan, OK 73533 | Oil & Gas Operator | Dec 2021 |
| 15 | Killian, Jeffrey M | Bowling Green, KY 42101 | Oil & Gas Operator | Dec 2023 |
| 16 | Kinzer, J. W. | | Oil & Gas Operator | Dec 2006 |
| 17 | Kirby & Son Dozing | Lewisburg, KY 42256 | Oil Operator | Dec 2023 |
| 18 | KLC Petroleum Company, LLC | Henderson, KY 42420 | Oil Operator | Dec 2021 |
| 19 | Kraft, R L | | Oil Operator | Dec 2023 |
| 20 | Kruckenberg & Scott | Isabel, KS 67065 | Oil Operator | Dec 2011 |
| 21 | KV Oil & Gas, Inc. | | Oil & Gas Operator | Dec 2006 |
| 22 | KWR Ventures LLC | Harrisburg, IL 62946 | Oil Operator | Dec 2023 |
| 23 | Ky Crude LLC | Bowling Green, KY 42103 | Oil Operator | Dec 2021 |
| 24 | Ky Energy Group, LLC | | Oil & Gas Operator | Dec 2015 |
| 25 | Ky Ohio Gas Co | | Oil Operator | Dec 2021 |
| 26 | Ky-Tenn Expl Co, Inc | New Concord, OH 43762 | Oil & Gas Operator | Dec 2023 |
| 27 | Kytx Oil & Gas, LLC | Gray, KY 40734 | Oil & Gas Operator | Dec 2021 |