| 101 | K.W.S. Oil Development | Chanute, KS 66720 | Oil Operator | May 2004 |
| 102 | K2 America Corporation | Calgary, AB T3P 3S8 | Oil & Gas Operator | Nov 2017 |
| 103 | K2 Petroleum, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Feb 2026 |
| 104 | K3 Oil & Gas Operating Company | Spring, TX 77383 | Oil & Gas Operator | Nov 2025 |
| 105 | K3 Productions LLC | Houston, TX 77269 | Oil & Gas Operator | Feb 2026 |
| 106 | K3 Resources, Inc. | Garden City, KS 67846 | Gas Operator | Aug 2013 |
| 107 | Ka Energy Op Co. LLC | Oakland, CA 94605 | Oil & Gas Operator | Oct 2021 |
| 108 | Ka Tex Energies, Inc. | Iola, TX 77861 | Oil & Gas Operator | May 1999 |
| 109 | Ka-Lyn Oil & Gas, Inc. | | Oil & Gas Operator | Jul 1990 |
| 110 | Kabco Oil & Gas Company | Longview, TX 75604 | Oil & Gas Operator | Jun 2018 |
| 111 | Kabco Production | | Oil & Gas Operator | Sep 1999 |
| 112 | Kabco-Pennington | | Oil & Gas Operator | Oct 1996 |
| 113 | Kachina Exploration Inc | Cheyenne, WY 82003 | Oil & Gas Operator | Jul 2000 |
| 114 | Kachina Oil & Gas Inc. | Austin, TX 78766 | Oil & Gas Operator | Jul 2002 |
| 115 | Kachina Oil Comp | | Oil & Gas Operator | Jan 1988 |
| 116 | Kachina Oil Company | Wichita, KS 67202 | Gas Operator | Sep 1998 |
| 117 | Kadane & Sons | | Oil & Gas Operator | Sep 2000 |
| 118 | Kadane Corporation | Dallas, TX 75205 | Oil & Gas Operator | Feb 2026 |
| 119 | Kadane Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 1998 |
| 120 | Kahan & Assoc In | | Oil Operator | Dec 1996 |
| 121 | Kahan & Associates Inc | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2025 |
| 122 | Kahan Louis | Tulsa, OK 74101 | Oil & Gas Operator | May 1994 |
| 123 | Kahlenberg Oil And Gas LLC | Conroe, TX 77304 | Oil Operator | Feb 2026 |
| 124 | Kahn George Operating Co | Seminole, OK 74818 | Oil & Gas Operator | Nov 2000 |
| 125 | Kaib & Kaib | Zanesville, OH 43701-6251 | Gas Operator | Dec 2025 |
| 126 | Kain Petroleum Company | Pearsall, TX 78061 | Gas Operator | May 2011 |
| 127 | Kain Petroleum, LLC | Pearsall, TX 78061 | Oil & Gas Operator | Feb 2026 |
| 128 | Kainz, David R. | Ottawa, KS 66067 | Oil Operator | Aug 2009 |
| 129 | Kaiser Aluminum Exploration Co | | Oil & Gas Operator | Dec 1986 |
| 130 | Kaiser Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 1990 |
| 131 | Kaiser Farms | Edmond, OK 73025-9489 | Oil & Gas Operator | Nov 2025 |
| 132 | Kaiser Investments | Sand Springs, OK 74063 | Oil & Gas Operator | Sep 2003 |
| 133 | Kaiser Oil (U.S.) LTD. | | Oil & Gas Operator | Apr 1983 |
| 134 | Kaiser Operating, LLC | | Oil & Gas Operator | Dec 2025 |
| 135 | Kaiser-Francis O | | Oil & Gas Operator | Oct 1995 |
| 136 | Kaiser-Francis Oil | | Oil Operator | Nov 1995 |
| 137 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Feb 2026 |
| 138 | Kal Energy Inc | Oklahoma City, OK 73116-3606 | Oil Operator | Nov 2014 |
| 139 | Kal Oil Operations | | Oil Operator | Jun 2025 |
| 140 | Kala Oil Company | Sundown, TX 79372 | Oil & Gas Operator | Feb 2026 |
| 141 | Kalco Development Corporation | | Gas Operator | Dec 1989 |
| 142 | Kalda Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 1994 |
| 143 | Kaler Energy Corp. | Boerne, TX 78006 | Oil & Gas Operator | Feb 2026 |
| 144 | Kaler Oil Company | Gainesville, TX 76240 | Oil & Gas Operator | Dec 2024 |
| 145 | Kalkaska Oilfield Services Inc | | Oil Operator | Aug 2006 |
| 146 | Kalkman Oil Corporation | Duncan, OK 73533 | Oil & Gas Operator | Nov 2025 |
| 147 | Kallina, Carlton J. | Houston, TX 77269 | Gas Operator | Feb 2026 |
| 148 | Kalos Corporation | Tyler, TX 75701 | Oil & Gas Operator | Feb 2026 |
| 149 | Kalstra Energy LTD | Denver, CO 80222-5938 | Gas Operator | Jun 2018 |
| 150 | Kamc Oil & Gas LLC | Queen Creek, AZ 85142 | Oil Operator | Jan 2011 |
| 151 | Kamco Hot Oil Service Inc | Cement, OK 73017 | Oil & Gas Operator | Dec 2025 |
| 152 | Kamco Limited | Salt Lake City, UT 84105 | Oil Operator | Sep 2016 |
| 153 | Kamlok Oil & Gas, Inc. | Houston, TX 77240 | Oil & Gas Operator | Jun 1996 |
| 154 | Kamlok, Inc. | | Oil Operator | Nov 1991 |
| 155 | Kammer, Walter A. | Holland, NY 14080 | Gas Operator | Dec 2024 |
| 156 | Kampresco Energy, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 157 | Kan-Cal Enterpri | | Oil Operator | Dec 1988 |
| 158 | Kan-Ex Incorpora | | Oil & Gas Operator | Jan 1985 |
| 159 | Kan-Tex Drilling Corp. | | Oil Operator | Dec 1981 |
| 160 | Kan-Texco Incorp | | Oil & Gas Operator | Dec 1994 |
| 161 | Kana Resources, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Aug 2003 |
| 162 | Kanaco Oil Company | | Oil Operator | Apr 2025 |
| 163 | Kanalta Resources, LTD. | Yates Center, KS 66783 | Oil Operator | Jan 1998 |
| 164 | Kanan Oil & Gas, Inc. | | Oil & Gas Operator | Oct 1987 |
| 165 | Kandletop Operating, LLC | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2025 |
| 166 | Kaneb Energy Company | | Oil & Gas Operator | Jan 1986 |
| 167 | Kaneb Oil & Gas | | Oil & Gas Operator | Oct 1987 |
| 168 | Kaneb Oil & Gas Company | | Oil & Gas Operator | Nov 1985 |
| 169 | Kaneb Operating Company | Dallas, TX 75265-0283 | Oil & Gas Operator | Dec 1995 |
| 170 | Kaneb Operg Co. LTD. PTN. | | Oil & Gas Operator | Aug 1988 |
| 171 | Kanik, Anthony S Dba Kanik Oil Co | McLeansboro, IL 62859 | Oil Operator | Dec 2023 |
| 172 | Kanmap Incorpora | | Oil & Gas Operator | Dec 1995 |
| 173 | Kanmap, A Kansas Corporation | Independence, KS 67301 | Oil & Gas Operator | Aug 2025 |
| 174 | Kano Partners | | Oil Operator | Sep 1989 |
| 175 | Kanok Energy LLC | Henryetta, OK 74437 | Gas Operator | Nov 2023 |
| 176 | Kanokla Oil & Gas Corporation | Wellington, KS 67152-0444 | Oil & Gas Operator | Nov 2025 |
| 177 | Kanpetro, Inc. | | Oil Operator | May 1991 |
| 178 | Kansas Bourse In | | Oil & Gas Operator | Apr 1985 |
| 179 | Kansas City Oil, LLC | Parkville, MO 64152 | Oil Operator | Aug 2025 |
| 180 | Kansas Crude Investments LLC | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 181 | Kansas Crude Oil | | Oil Operator | Dec 1987 |
| 182 | Kansas Crude Resources, LLC | | Oil Operator | Sep 2025 |
| 183 | Kansas Crude, Inc. | Hutchinson, KS 67501 | Oil & Gas Operator | Apr 2003 |
| 184 | Kansas Energy Company, L.L.C. | Sedan, KS 67361 | Oil & Gas Operator | Sep 2025 |
| 185 | Kansas Gas Co., Inc. | Wichita Falls, TX 76310 | Gas Operator | Sep 2025 |
| 186 | Kansas Gas Purchasing | Salina, KS 67401 | Oil & Gas Operator | May 1995 |
| 187 | Kansas Gas Service | | Oil Operator | Nov 1996 |
| 188 | Kansas Gas Suppl | | Gas Operator | Sep 1984 |
| 189 | Kansas Horizon O | | Oil & Gas Operator | Jun 1994 |
| 190 | Kansas Horizon Oil, Inc. | Windom, KS 67491 | Oil Operator | May 2017 |
| 191 | Kansas Ka-Tex Joint Venture, A General Partnership | San Antonio, TX 78216 | Gas Operator | Aug 2011 |
| 192 | Kansas MB Project, LLC | Skiatook, OK 74070 | Oil & Gas Operator | Sep 2024 |
| 193 | Kansas Natural G | | Oil & Gas Operator | Dec 1996 |
| 194 | Kansas Natural Gas Operating, LC | Hays, KS 67601 | Gas Operator | Sep 2025 |
| 195 | Kansas Natural Gas, Inc. | Hays, KS 67601 | Gas Operator | Sep 2025 |
| 196 | Kansas Oil & Gas Corporation | Woodland HLS, CA 91367 | Oil & Gas Operator | Feb 2001 |
| 197 | Kansas Oil Company | Kansas City, KS 66117 | Oil Operator | May 1997 |
| 198 | Kansas Oil Prope | | Oil & Gas Operator | Sep 1991 |
| 199 | Kansas Oil, Inc. | Chanute, KS 66720 | Oil Operator | Dec 2009 |
| 200 | Kansas Oil, LLC | | Oil Operator | Sep 2025 |