| 1 | K & L Operating LLC | Cushing, OK 74023-6189 | Oil & Gas Operator | Jun 2025 |
| 2 | K Spencer LLC | Drumright, OK 74030-5825 | Oil & Gas Operator | Sep 2019 |
| 3 | K-C Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Jan 2013 |
| 4 | Kahn George Operating Co | Seminole, OK 74818 | Oil & Gas Operator | Nov 2000 |
| 5 | Kaiser Investments | Sand Springs, OK 74063 | Oil & Gas Operator | Sep 2003 |
| 6 | Kana Resources, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Aug 2003 |
| 7 | Kanokla Oil & Gas Corporation | Wellington, KS 67152-0444 | Oil & Gas Operator | Jun 2025 |
| 8 | Kantor Oil Company, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2025 |
| 9 | Kato Operating Company | Bristow, OK 74010 | Oil & Gas Operator | Mar 2015 |
| 10 | Katy Drilling Corporation | Tulsa, OK 74146-3717 | Oil & Gas Operator | Apr 2020 |
| 11 | Kay Production Company Inc | Seminole, OK 74868 | Oil & Gas Operator | Jun 2025 |
| 12 | Keener Oil & Gas Company | Tulsa, OK 74119-4416 | Oil & Gas Operator | Jul 2025 |
| 13 | Keener Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2018 |
| 14 | Kellogg Oil Company | Henryetta, OK 74437 | Oil & Gas Operator | Oct 2024 |
| 15 | Kelmar Oil Company | Chickasha, OK 73018 | Oil & Gas Operator | Jun 2025 |
| 16 | Kemmerer Company Inc | Tulsa, OK 74136-7027 | Oil & Gas Operator | Feb 2025 |
| 17 | Kenworthy Operating Company | Tulsa, OK 74132 | Oil & Gas Operator | May 2009 |
| 18 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | May 2025 |
| 19 | Kerr-McGee Refining Corp | Oklahoma City, OK 73125 | Oil & Gas Operator | Jun 2007 |
| 20 | Ketal Oil Producing Company | Fort Worth, TX 76102 | Gas Operator | Sep 1995 |
| 21 | Keystone Oil And Gas Company LLC | Collinsville, OK 74021 | Oil & Gas Operator | May 2025 |
| 22 | Kidd Bill R | Bristow, OK 74010-9721 | Oil Operator | Jan 2013 |
| 23 | Kiefer Oil And Gas Co Inc | Sapulpa, OK 74066 | Oil & Gas Operator | Apr 2011 |
| 24 | Kingdom Resources Inc | Frisco, TX 75033-3673 | Oil & Gas Operator | Jun 2023 |
| 25 | Kiska Oil Company | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2019 |
| 26 | Klo LLC | Tulsa, OK 74120-2428 | Oil & Gas Operator | Jul 2025 |
| 27 | Knife Oil Company Inc | Cushing, OK 74023-1347 | Oil & Gas Operator | Aug 2000 |
| 28 | Koby Oil Company LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2025 |
| 29 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 30 | Kodiak Oil & Gas Inc | Muenster, TX 76252 | Oil & Gas Operator | Oct 2025 |
| 31 | Kopco, Inc. | Caney, KS 67333 | Oil & Gas Operator | Jul 2025 |
| 32 | Kraker Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 1995 |
| 33 | Krotzer Oil Company | Cleveland, OK 74020 | Oil & Gas Operator | Jun 2025 |
| 34 | Krumme Oil Company LLP | Bristow, OK 74010 | Oil & Gas Operator | Jun 2025 |
| 35 | KWB Oil Property Management Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |