| 101 | Keen Oil Co | | Oil & Gas Operator | Aug 2025 |
| 102 | Keener Oil Compa | | Oil & Gas Operator | Jul 1988 |
| 103 | Keener Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2018 |
| 104 | Keith F Walker Oil & Gas Company LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2025 |
| 105 | Keller Heirs Oil | | Oil Operator | May 2025 |
| 106 | Kelley Edgar Oil & Gas Operations | | Gas Operator | Nov 2015 |
| 107 | Kelly Company LC | Lenexa, KS 67215 | Oil & Gas Operator | Sep 2025 |
| 108 | Kelso Casing Pul | | Oil Operator | Mar 1995 |
| 109 | Kelso, Mike Oil | Chase, KS 67524 | Oil Operator | Oct 2013 |
| 110 | Kelt Energy Inco | | Oil & Gas Operator | Sep 1995 |
| 111 | Kelt Energy, Inc. | Independence, KS 67301 | Oil & Gas Operator | Dec 2003 |
| 112 | Kem Energy, Inc. | Katy, TX 77450 | Oil & Gas Operator | Feb 2026 |
| 113 | Kema Oil Company, Inc. | Lebo, KS 66856 | Oil Operator | Sep 2025 |
| 114 | Kenbill Oil Comp | | Oil Operator | Jun 1994 |
| 115 | Kenneco Incorpor | | Oil Operator | Sep 1984 |
| 116 | Kennedy & Mitche | | Oil & Gas Operator | May 1990 |
| 117 | Kenneth & Regina Laymon, LLC | Neosho Falls, KS 66758 | Oil Operator | Dec 2019 |
| 118 | Kenneth W Cory LTD | Bellaire, TX 77401 | Oil & Gas Operator | Nov 2025 |
| 119 | Kenny Brown Enterprises LLC | Hays, KS 67601 | Oil Operator | Jul 2013 |
| 120 | Kent, Cameron J | Garnett, KS 66032 | Oil Operator | Aug 2025 |
| 121 | Kent, VInce J | Garnett, KS 66032 | Oil Operator | Oct 2002 |
| 122 | Kenworthy Operating Company | Tulsa, OK 74132 | Oil & Gas Operator | May 2009 |
| 123 | Kephart Drilling | | Gas Operator | Aug 1991 |
| 124 | Kephart Drilling, Inc. | Thayer, KS 66776 | Oil & Gas Operator | Dec 2008 |
| 125 | Kephart Gas Production, A General Partnership | Thayer, KS 66776 | Gas Operator | Aug 2004 |
| 126 | Kepley Brothers | Chanute, KS 66720 | Oil Operator | Sep 1992 |
| 127 | Kepley Well Service, LLC | Chanute, KS 66720 | Oil Operator | Mar 2025 |
| 128 | Kepley, L.F. | Wichita, KS 67204 | Oil Operator | Feb 1986 |
| 129 | Kepley, William Samuel | Chanute, KS 66720 | Oil Operator | Nov 2024 |
| 130 | Kera-Oil | Great Bend, KS 67530 | Oil Operator | Dec 2009 |
| 131 | Kern Co. | Houston, TX 77095 | Oil & Gas Operator | Jan 2021 |
| 132 | Kernodle Bros. Oil & Gas, General Partnership | Raytown, MO 64133 | Oil Operator | Jun 2018 |
| 133 | Kerr Oil, LLC | Iola, KS 66749 | Oil Operator | Dec 2009 |
| 134 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 135 | Kewanee Oil Comp | | Oil & Gas Operator | Nov 1996 |
| 136 | Key Gas Corp. | Wichita, KS 67202 | Oil & Gas Operator | Nov 2018 |
| 137 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Nov 2025 |
| 138 | Keys Gerald W Oi | | Oil Operator | Mar 1993 |
| 139 | Keys, Gerald Oil Production & Explor. | Humboldt, KS 66748 | Oil Operator | Mar 1999 |
| 140 | Keyse, Ralph L. | Lane, KS 66042 | Oil Operator | Jul 2018 |
| 141 | Keystone Oil Co. | Eureka, KS 67045 | Oil Operator | May 2000 |
| 142 | KG Oil Co | | Oil Operator | Aug 2025 |
| 143 | Kilby Oil Producer | Wichita, KS 67210 | Gas Operator | Sep 1997 |
| 144 | Kilby, M. T. | Yates Center, KS 66783 | Oil Operator | Sep 1986 |
| 145 | Kimbark Oil & Ga | | Oil & Gas Operator | Aug 1992 |
| 146 | Kimbark Oil & Gas Company | Denver, CO 80203 | Oil & Gas Operator | May 2007 |
| 147 | Kimzey Drilling | | Oil Operator | Nov 2009 |
| 148 | Kinderhook Oil & | | Oil Operator | Dec 1993 |
| 149 | Kindervag Robert | | Oil Operator | Jun 1991 |
| 150 | King Daniel L | | Oil Operator | May 1994 |
| 151 | King Energy Co. | | Oil Operator | Nov 2019 |
| 152 | King Energy Comp | | Oil Operator | Dec 1996 |
| 153 | King Oil Operations, LLC | Ellis, KS 67637 | Oil Operator | Sep 2025 |
| 154 | King Oil, Inc. | Jetmore, KS 67854 | Oil Operator | Sep 2025 |
| 155 | King'S Well Service LLC | Blackwell, OK 74631 | Oil Operator | Sep 2025 |
| 156 | Kingsbury Petrol | | Oil Operator | Jul 1986 |
| 157 | Kinney Oil Company | Denver, CO 80202 | Oil Operator | Dec 2024 |
| 158 | Kiowa Gas Company | Dallas, TX 75206 | Oil & Gas Operator | Sep 2025 |
| 159 | Kiowa Producers, LLC | Parsons, KS 67357 | Oil & Gas Operator | Jan 2025 |
| 160 | Kirkman W L Inco | | Oil & Gas Operator | Dec 1994 |
| 161 | Kirkpatrick | Longton, KS 67352 | Oil Operator | Jun 2000 |
| 162 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Feb 2026 |
| 163 | Kirkpatrick Properties LLC | Ellinwood, KS 67526 | Oil Operator | Sep 2025 |
| 164 | Kirkpatrick W E | Ponca City, OK 74604-4146 | Gas Operator | Oct 2001 |
| 165 | Kiska Oil Compan | | Oil & Gas Operator | Oct 1989 |
| 166 | Kiska Oil Company | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2019 |
| 167 | Kitchen, Robert (Deceased) | Osawatomie, KS 66064 | Oil Operator | Oct 2009 |
| 168 | Kittle Oil | | Oil Operator | Apr 2025 |
| 169 | Kiwanda Energy, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jan 2008 |
| 170 | Kiwanda Resc Inc | | Oil & Gas Operator | Aug 1993 |
| 171 | Kizzar Well Servicing, Inc. | Chase, KS 67524 | Oil Operator | Sep 2025 |
| 172 | Kjellin, Charles Willard (Deceased) | Marion, KS 66861 | Oil & Gas Operator | Oct 2013 |
| 173 | Klabzuba Oil & Gas Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2012 |
| 174 | KLB Operating, Inc. | Plainville, KS 67663 | Oil Operator | Aug 2001 |
| 175 | Klenda, John | Marion, KS 66861 | Gas Operator | Dec 2023 |
| 176 | Klima Oil, Inc. | Great Bend, KS 67530 | Oil Operator | Dec 2009 |
| 177 | Klima Well Servi | | Oil Operator | Dec 1996 |
| 178 | Klima Well Service, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Sep 2025 |
| 179 | Klippel, B.W., Jr. | Wichita, KS 67220 | Oil Operator | May 1999 |
| 180 | KLM Exploration Company, Inc. | McLouth, KS 66054 | Oil Operator | Dec 2019 |
| 181 | KLM Oil Operations, Inc. | El Dorado, KS 67042 | Oil Operator | Apr 1998 |
| 182 | KLM Operating | | Oil & Gas Operator | Mar 2025 |
| 183 | KLMKH Inc | Charlotte, NC 28270 | Oil Operator | Sep 2025 |
| 184 | Kloberdanz Paul | | Gas Operator | Apr 1991 |
| 185 | Kloberdanz Paul E | Oklahoma City, OK 73157 | Oil & Gas Operator | Aug 2021 |
| 186 | Klondike Investments, Inc. | Paola, KS 66071 | Oil Operator | Sep 2011 |
| 187 | KN Production Company | Lakewood, CO 80228 | Oil & Gas Operator | Jun 2003 |
| 188 | Knife River Oil, LLC | Bull Shoals, AR 72619 | Oil Operator | Feb 2017 |
| 189 | Knight Oil Company | Victoria, KS 67671 | Gas Operator | Sep 2025 |
| 190 | Knight, Joeann | Kilgore, TX 75662 | Oil Operator | Sep 1989 |
| 191 | Knighton Oil Com | | Oil & Gas Operator | Nov 1996 |
| 192 | Knighton Oil Company, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 193 | Koch Exploration | | Oil & Gas Operator | Oct 1988 |
| 194 | Koch Exploration Company | Houston, TX 77046 | Oil & Gas Operator | Apr 2003 |
| 195 | Kodiak Energy LLC | Pineville, MO 64856 | Oil Operator | Dec 2019 |
| 196 | Kodiak Oil Co. | Stockton, MO 65785 | Oil Operator | May 1996 |
| 197 | Kodiak Petroleum Inc | Englewood, CO 80155 | Oil & Gas Operator | Sep 2025 |
| 198 | Koehn Alfred D | | Oil & Gas Operator | Sep 1994 |
| 199 | Koehn Eldon R | | Oil Operator | Dec 2009 |
| 200 | Koehn Radell W | | Oil Operator | Dec 2009 |