| 1 | K & M Oil Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2025 |
| 2 | K3 Oil & Gas Operating Company | Spring, TX 77383 | Oil & Gas Operator | Jan 2025 |
| 3 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2025 |
| 4 | Kalkman Oil Corporation | Duncan, OK 73533 | Oil & Gas Operator | Jan 2025 |
| 5 | Kanokla Oil & Gas Corporation | Wellington, KS 67152-0444 | Oil & Gas Operator | Jan 2025 |
| 6 | Kansas Gas Purchasing | Salina, KS 67401 | Oil & Gas Operator | May 1995 |
| 7 | Kay County Properties | Tulsa, OK 74145 | Oil & Gas Operator | May 1997 |
| 8 | Kay Production Company Inc | Seminole, OK 74868 | Oil & Gas Operator | Dec 2024 |
| 9 | Keener Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2018 |
| 10 | Keith F. Walker Oil & Gas Co., LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2025 |
| 11 | Kelle Day Oil Producers Inc | Braman, OK 74632-9147 | Oil & Gas Operator | Dec 2023 |
| 12 | Kelle Lambing Production Co | Braman, OK 74632-0132 | Oil & Gas Operator | Nov 2014 |
| 13 | Kelly Jr Walter A Opr Co | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2014 |
| 14 | Kelmac Production Company | Braman, OK 74632-0132 | Oil Operator | Apr 2003 |
| 15 | Kingfisher CSG Pullr & Const Inc | Hennessey, OK 73742-0024 | Oil & Gas Operator | Apr 2014 |
| 16 | Kingman Petroleum Inc | Dolores, CO 81323-9503 | Oil & Gas Operator | Dec 2024 |
| 17 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2025 |
| 18 | Kirkpatrick W E | Ponca City, OK 74604-4146 | Gas Operator | Oct 2001 |
| 19 | Kiska Oil Company | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2019 |
| 20 | Kivett Kenneth W | Blackwell, OK 74631-0134 | Oil & Gas Operator | Jun 2001 |
| 21 | Klinger Energy Inc | Ponca City, OK 74601-7812 | Oil & Gas Operator | Oct 2019 |
| 22 | Klinger Shirley | Ponca City, OK 74601-7812 | Oil & Gas Operator | Jan 2025 |
| 23 | Klo LLC | Tulsa, OK 74120-2428 | Oil & Gas Operator | Feb 2025 |
| 24 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 25 | Koda Operating LLC | Tyler, TX 75703-5596 | Oil & Gas Operator | Jan 2025 |
| 26 | Krumme Oil Company LLP | Bristow, OK 74010 | Oil & Gas Operator | Jan 2025 |
| 27 | KT Investments Inc | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2025 |