| 101 | Kerr-McGee Refining Corp | Oklahoma City, OK 73125 | Oil & Gas Operator | Jun 2007 |
| 102 | Ketal Oil Producing Company | Fort Worth, TX 76102 | Gas Operator | Sep 1995 |
| 103 | Key Energy Corporation | Enid, OK 73702-5349 | Oil & Gas Operator | Oct 2017 |
| 104 | Key Energy Services Inc | Midland, TX 79705-5540 | Oil Operator | Jan 2008 |
| 105 | Key Oil Company | Duncan, OK 73533 | Oil & Gas Operator | Dec 2021 |
| 106 | Key Operating Company Inc | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2025 |
| 107 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Oct 2025 |
| 108 | Keystone Oil And Gas Company LLC | Collinsville, OK 74021 | Oil & Gas Operator | Sep 2025 |
| 109 | Keystone Production Company | Duncan, OK 73533-9117 | Oil & Gas Operator | May 2005 |
| 110 | Kiamichi Resources Inc | Oklahoma City, OK 73143 | Oil & Gas Operator | Feb 2016 |
| 111 | Kibtec Oil & Gas Inc | Cashion, OK 73016 | Oil & Gas Operator | Aug 2024 |
| 112 | Kickapoo Oil Co | Baton Rouge, LA 70815 | Gas Operator | Feb 1994 |
| 113 | Kidd Bill R | Bristow, OK 74010-9721 | Oil Operator | Jan 2013 |
| 114 | Kidd Oil & Gas, LC | Dallas, TX 75219 | Oil & Gas Operator | Apr 1999 |
| 115 | Kiefer Oil And Gas Co Inc | Sapulpa, OK 74066 | Oil & Gas Operator | Apr 2011 |
| 116 | Kienzle John A | Shawnee, OK 74802-1265 | Oil & Gas Operator | Aug 2013 |
| 117 | Kiester Operating Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Sep 2025 |
| 118 | Kile Production | Cypress, TX 77410 | Oil & Gas Operator | Aug 2014 |
| 119 | Kim Ray Oil & Gas | Ada, OK 74820 | Oil & Gas Operator | Aug 2025 |
| 120 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 121 | Kimbark Oil & Gas Company | Denver, CO 80203 | Oil & Gas Operator | May 2007 |
| 122 | Kimco Oil And Gas | Wewoka, OK 74884-0613 | Oil & Gas Operator | Jul 2016 |
| 123 | Kimraco Oil Inc | Pawnee, OK 74058-2869 | Oil & Gas Operator | Apr 2016 |
| 124 | Kinder Oil Properties | Carney, OK 74832-9711 | Gas Operator | Nov 1999 |
| 125 | King & Kelly | Tulsa, OK 74103 | Oil Operator | Aug 1993 |
| 126 | King Energy LLC | Oklahoma City, OK 73116-9044 | Oil & Gas Operator | Oct 2025 |
| 127 | King Jerry L | Wann, OK 74083-9727 | Oil & Gas Operator | Oct 2019 |
| 128 | King Operating Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Dec 2025 |
| 129 | Kingdom Resources Inc | Frisco, TX 75033-3673 | Oil & Gas Operator | Jun 2023 |
| 130 | Kingery Drilling Co., Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Oct 2025 |
| 131 | Kingfisher CSG Pullr & Const Inc | Hennessey, OK 73742-0024 | Oil & Gas Operator | Apr 2014 |
| 132 | Kingfisher Resources Inc | Clinton, OK 73601 | Oil & Gas Operator | Oct 2025 |
| 133 | Kingman Petroleum Inc | Dolores, CO 81323-9503 | Oil & Gas Operator | Oct 2025 |
| 134 | Kinta Public Works | Kinta, OK 74552 | Oil & Gas Operator | Mar 2011 |
| 135 | Kirby Exploration Company | Houston, TX 77251 | Oil & Gas Operator | Jan 2014 |
| 136 | Kirk Billie E | Morris, OK 74445 | Oil & Gas Operator | Sep 2025 |
| 137 | Kirk David | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 138 | Kirk Tank Trucks Inc | Morris, OK 74445 | Oil & Gas Operator | Dec 2021 |
| 139 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Dec 2025 |
| 140 | Kirkpatrick Ronald B | | Oil & Gas Operator | Jul 2013 |
| 141 | Kirkpatrick W E | Ponca City, OK 74604-4146 | Gas Operator | Oct 2001 |
| 142 | Kirrie Oil Company LLC | Oklahoma City, OK 73113-0125 | Oil & Gas Operator | Jun 2025 |
| 143 | Kiska Oil Company | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2019 |
| 144 | Kivett Kenneth W | Blackwell, OK 74631-0134 | Oil & Gas Operator | Jun 2001 |
| 145 | KJB Oil Company LLC | Dewey, OK 74029-3053 | Oil Operator | Aug 2025 |
| 146 | KJR Services LLC | Edmond, OK 73083 | Oil & Gas Operator | Aug 2025 |
| 147 | Klabzuba Brothers LLC | Prague, OK 74864-0567 | Oil & Gas Operator | Jul 2007 |
| 148 | Klabzuba Oil & Gas Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2012 |
| 149 | Klabzuba Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2013 |
| 150 | Klabzuba Royalty Company | Prague, OK 74864-0567 | Oil & Gas Operator | Dec 2019 |
| 151 | KLBW Partners, L.L.C. | Ratliff City, OK 73481 | Oil & Gas Operator | Sep 2025 |
| 152 | Kleen Oilfield Services Co | Velma, OK 73491-0178 | Oil & Gas Operator | Oct 2025 |
| 153 | Klingensmith Fred T Etal | Sapulpa, OK 74066 | Oil & Gas Operator | Nov 2007 |
| 154 | Klinger Energy Inc | Ponca City, OK 74601-7812 | Oil & Gas Operator | Oct 2019 |
| 155 | Klinger Shirley | Ponca City, OK 74601-7812 | Oil & Gas Operator | Oct 2025 |
| 156 | KLM Oil & Gas Company | Tonganoxie, KS 66086 | Oil & Gas Operator | Apr 2014 |
| 157 | Klo LLC | Tulsa, OK 74120-2428 | Oil & Gas Operator | Oct 2025 |
| 158 | Kloberdanz Paul E | Oklahoma City, OK 73157 | Oil & Gas Operator | Aug 2021 |
| 159 | Klotzman, M. S. Exploration Co. | Victoria, TX 77903 | Oil & Gas Operator | Dec 2025 |
| 160 | KMV Consulting Inc | Winston Salem, NC 27101-2561 | Gas Operator | Dec 2012 |
| 161 | KN Production Company | Lakewood, CO 80228 | Oil & Gas Operator | Jun 2003 |
| 162 | KNG Producers | Dumas, TX 79029 | Oil & Gas Operator | Oct 2009 |
| 163 | Knife Oil Company Inc | Cushing, OK 74023-1347 | Oil & Gas Operator | Aug 2000 |
| 164 | Knight Energy Inc | Tulsa, OK 74104 | Oil Operator | Sep 2025 |
| 165 | Knutson Production Company | Loco, OK 73442-9706 | Oil & Gas Operator | Sep 2025 |
| 166 | Koby Oil Company LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 167 | Koch Hydrocarbon Company | Wichita, KS 67220-3203 | Oil & Gas Operator | Nov 2014 |
| 168 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 169 | Koda Operating LLC | Tyler, TX 75703-5596 | Oil & Gas Operator | Sep 2025 |
| 170 | Kodiak Oil & Gas Exploration Inc | Oklahoma City, OK 73134-1046 | Oil & Gas Operator | Oct 2025 |
| 171 | Kodiak Oil & Gas Inc | Muenster, TX 76252 | Oil & Gas Operator | Dec 2025 |
| 172 | Koehler Rose Dba R & H Production | Cement, OK 73017 | Oil & Gas Operator | Oct 2021 |
| 173 | Koelsch Rex Or Marie | Tulsa, OK 74107-8647 | Oil & Gas Operator | Jul 2024 |
| 174 | Kolar Petroleum Inc | Oklahoma City, OK 73162-1509 | Oil & Gas Operator | Jun 2007 |
| 175 | Kolibri Energy Us, Inc. | Thousand Oaks, CA 91320-1272 | Oil & Gas Operator | Sep 2025 |
| 176 | Kopco Inc | Caney, KS 67333 | Oil & Gas Operator | Oct 2025 |
| 177 | Kornblit, Majir | | Oil Operator | Nov 1998 |
| 178 | Kouplen Steve | Beggs, OK 74421 | Oil & Gas Operator | Oct 2024 |
| 179 | KP Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1997 |
| 180 | KPL Production Company LLC | Oklahoma City, OK 73112-4709 | Oil & Gas Operator | Feb 2017 |
| 181 | Kraker Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 1995 |
| 182 | Krebbs, David B | | Oil & Gas Operator | Aug 2025 |
| 183 | Krotzer Oil Company | Cleveland, OK 74020 | Oil & Gas Operator | Oct 2025 |
| 184 | KRS Oil Company | Frisco, TX 75034 | Oil & Gas Operator | Apr 2020 |
| 185 | Krumme Oil Company LLP | Bristow, OK 74010 | Oil & Gas Operator | Oct 2025 |
| 186 | Krumme Wesley J | Oklahoma City, OK 73120 | Oil & Gas Operator | Jun 1997 |
| 187 | KSW Operating,LLC | | Oil & Gas Operator | Mar 2015 |
| 188 | KT Energy Inc | Enid, OK 73702-2365 | Oil & Gas Operator | Oct 2025 |
| 189 | KT Investments Inc | Hennessey, OK 73742 | Oil & Gas Operator | Oct 2025 |
| 190 | KTP Energy, Inc. | Denver, CO 80226 | Oil & Gas Operator | Aug 2019 |
| 191 | Kuran Resources Inc | Wichita Falls, TX 76305 | Oil Operator | Jul 2021 |
| 192 | KWB Oil Property Management Inc | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 193 | Ky Oil Co | Palco, KS 67657 | Oil & Gas Operator | Aug 2000 |
| 194 | Kybenco Disposals LLC | Maysville, OK 73052 | Oil Operator | Sep 2022 |
| 195 | Kyler Oil Company | Pawhuska, OK 74056-0117 | Oil Operator | Nov 1998 |