| 101 | Keith F. Walker Oil & Gas Co., LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jul 2025 |
| 102 | Keith Petroleum Corporation | Houston, TX 77063 | Oil & Gas Operator | Jan 1993 |
| 103 | Kek Exploration LLC | Midland, TX 79702 | Oil Operator | Oct 2025 |
| 104 | Kellco Energy, LTD. | Houston, TX 77057 | Oil & Gas Operator | Nov 2007 |
| 105 | Kellerville Operating, LLC | Pampa, TX 79065 | Oil & Gas Operator | Oct 2025 |
| 106 | Kelley Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2002 |
| 107 | Kelly Mahler Operating, LLC | Graham, TX 76450 | Oil Operator | Oct 2025 |
| 108 | Kelly Resources, LTD. | Frisco, TX 75034 | Oil & Gas Operator | Aug 2004 |
| 109 | Kelpetro, Inc. | Houston, TX 77056 | Oil & Gas Operator | Mar 2012 |
| 110 | Kelsey Operating, Inc. | Houston, TX 77077 | Oil Operator | Feb 2022 |
| 111 | Kelso Oil LLC | Chase, KS 67524 | Oil & Gas Operator | Apr 2007 |
| 112 | Kelt Oil & Gas, Inc. | Torrance, CA 90503 | Oil & Gas Operator | Dec 2003 |
| 113 | Kelton Oil & Gas Co | Wheeler, TX 79096 | Oil Operator | Jun 1991 |
| 114 | Kelton, B.J. | Rosharon, TX 77583 | Oil & Gas Operator | Oct 2025 |
| 115 | Kem Energy, Inc. | Katy, TX 77450 | Oil & Gas Operator | Oct 2025 |
| 116 | Kemco Oil | Alice, TX 78332 | Oil & Gas Operator | Aug 2009 |
| 117 | Kemp, Walter | Talpa, TX 76882 | Gas Operator | Oct 2025 |
| 118 | Kemper Operating Co. | Abilene, TX 79605 | Oil & Gas Operator | Nov 2015 |
| 119 | Ken Petroleum Corporation | Dallas, TX 75206 | Oil & Gas Operator | Feb 2019 |
| 120 | Ken-Cas Oil Co. | Levelland, TX 79336 | Oil & Gas Operator | Apr 1998 |
| 121 | Kendrick Oil And Gas Company | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 122 | Kendrick Oil Co. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2008 |
| 123 | Kendrick, Barbara S. | Baytown, TX 77521 | Oil Operator | Oct 2025 |
| 124 | Kendrick, Paul W. | Baytown, TX 77520 | Oil & Gas Operator | Sep 2005 |
| 125 | Kenne Exploration, Inc. | Missouri City, TX 77489 | Oil & Gas Operator | Oct 2025 |
| 126 | Kennedy & Mitchell, Inc. | Houston, TX 77084 | Oil & Gas Operator | Aug 2013 |
| 127 | Kennedy, Joseph D. | Stephenville, TX 76401 | Oil & Gas Operator | Jun 1995 |
| 128 | Kennedy, R. R. Production, Inc. | MC Camey, TX 79752 | Oil & Gas Operator | Oct 2025 |
| 129 | Kennemer, Darrell | Boyd, TX 76023 | Oil Operator | Oct 2025 |
| 130 | Kenneth W. Cory, LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Jun 2025 |
| 131 | Kent, Charles Operating Co. Inc. | Powell, TX 75153 | Oil & Gas Operator | Dec 2007 |
| 132 | Kenworthy Oil Company | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 133 | Kenworthy Operating Company | Tulsa, OK 74132 | Oil & Gas Operator | May 2009 |
| 134 | Kepa Energy, L.C. | Marshall, TX 75670 | Oil & Gas Operator | Mar 1998 |
| 135 | Kepco Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2025 |
| 136 | Kepco. Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 137 | Kern Co. | Houston, TX 77095 | Oil & Gas Operator | Jan 2021 |
| 138 | Kerns O & G, Inc. | San Antonio, TX 78232 | Oil & Gas Operator | Dec 2004 |
| 139 | Kerns Petroleum, Inc. | San Antonio, TX 78257 | Oil & Gas Operator | Sep 2013 |
| 140 | Kerogen Texas Energy Op LLC | Houston, TX 77060 | Oil & Gas Operator | Feb 2018 |
| 141 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | May 2025 |
| 142 | Kerr-McGee Oil & Gas Corp. | Houston, TX 77251 | Oil & Gas Operator | Sep 2006 |
| 143 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 144 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 145 | Kerr-McGee Rocky Mountain Corp | Denver, CO 80202 | Oil & Gas Operator | Jan 2007 |
| 146 | Kerry Oil & Gas, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jan 2004 |
| 147 | Kerry Petroleum Co Inc | Midland, TX 79708 | Oil & Gas Operator | Jun 2010 |
| 148 | Kestrel Resources, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Jan 2017 |
| 149 | Kewanee Oil Company | Houston, TX 77001 | Oil & Gas Operator | Aug 1978 |
| 150 | Key Energy Of Colorado, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2016 |
| 151 | Key Energy Services, LLC | Houston, TX 77042 | Oil Operator | Jan 2025 |
| 152 | Key Operating & Equipment, Inc. | Midlothian, TX 76065 | Oil & Gas Operator | Nov 2024 |
| 153 | Key Petroleum Inc. | Houston, TX 77056 | Oil & Gas Operator | Aug 2003 |
| 154 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jun 2025 |
| 155 | Key, J. J. | Lubbock, TX 79416 | Oil & Gas Operator | Oct 2025 |
| 156 | Keystone Energy LLC | Farmington, NM 87499 | Oil & Gas Operator | May 2025 |
| 157 | Keystone Energy Oil & Gas Inc | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2016 |
| 158 | Keystone Exploration, Inc | College Sta, TX 77845 | Oil & Gas Operator | Oct 2025 |
| 159 | Keystone Operating Co. | Round Rock, TX 78681 | Oil & Gas Operator | Oct 2025 |
| 160 | Keystone Petroleum GP LLC | Irving, TX 75039 | Oil & Gas Operator | May 2012 |
| 161 | Keystone Petroleum NM LLC | Irving, TX 75039 | Oil & Gas Operator | Jan 2016 |
| 162 | Keyway Oil & Gas Operating LLC | Kilgore, TX 75663 | Oil Operator | Oct 2020 |
| 163 | Kga Oil Company, Inc. | High Island, TX 77623 | Oil & Gas Operator | Aug 2004 |
| 164 | Kiamichi Oil & Gas | Whitehouse, TX 75791 | Oil Operator | Oct 1997 |
| 165 | Kiawah Resources, LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2017 |
| 166 | Kibbe, Anna S. | Falfurrias, TX 78355 | Oil & Gas Operator | Sep 1998 |
| 167 | Kidd Johnson Oil & Gas | San Angelo, TX 76904 | Oil & Gas Operator | Feb 2013 |
| 168 | Kidd Johnson Oil & Gas, LLC | San Angelo, TX 76904 | Oil & Gas Operator | Oct 2025 |
| 169 | Kidd Oil & Gas, LC | Dallas, TX 75219 | Oil & Gas Operator | Apr 1999 |
| 170 | Kidd Production Co. | Luling, TX 78648 | Oil & Gas Operator | Oct 2025 |
| 171 | Kids Future, L.L.C. | Bivins, TX 75555 | Oil Operator | Oct 2025 |
| 172 | Kile Production | Cypress, TX 77410 | Oil & Gas Operator | Aug 2014 |
| 173 | Killam Oil Co., LTD. | Laredo, TX 78042 | Oil & Gas Operator | Oct 2025 |
| 174 | Killam Oil Company | Laredo, TX 78042 | Oil & Gas Operator | Mar 1994 |
| 175 | Killer Rabbit Fields LLC | Monahans, TX 79756 | Oil & Gas Operator | Oct 2025 |
| 176 | Killingsworth Oil Co. | Longview, TX 75606 | Oil & Gas Operator | Oct 2025 |
| 177 | Killingsworth, Lee Operator | Longview, TX 75601 | Oil & Gas Operator | Jan 1999 |
| 178 | Killion Well Service Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2014 |
| 179 | Kilmarnock Oil Company, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Oct 2025 |
| 180 | Kilpatrick Production Company | Tye, TX 79563 | Oil & Gas Operator | Oct 2025 |
| 181 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 182 | Kimbell Oil Company Of Texas | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 183 | Kimbell Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 184 | Kimberlin & Huitt | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 1998 |
| 185 | Kimberlin & Miller | Dallas, TX 75230 | Oil & Gas Operator | Oct 2025 |
| 186 | Kimberlin Energy Group | Dallas, TX 75235 | Oil & Gas Operator | Oct 2025 |
| 187 | Kimble Oil Company, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2006 |
| 188 | Kimbrel Oil Corporation | Tulsa, OK 74114 | Oil & Gas Operator | Oct 2025 |
| 189 | Kimbrough Engineering Co, LLC | New Braunfels, TX 78132 | Oil & Gas Operator | Dec 2014 |
| 190 | Kimbrough Oil Company | Iraan, TX 79744 | Oil Operator | Oct 2025 |
| 191 | Kimbrough, D. E. | Iraan, TX 79744 | Oil & Gas Operator | Oct 2025 |
| 192 | Kimlar Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Oct 2025 |
| 193 | Kimleco Petroleum, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 2025 |
| 194 | Kimmeridge Texas Gas, LLC | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 195 | Kimsey, Roy E., Jr. | Midland, TX 79701 | Oil & Gas Operator | May 2018 |
| 196 | Kincaid Etal, Inc. | Holliday, TX 76366 | Oil Operator | Oct 2025 |
| 197 | Kincaid, Joey | Holliday, TX 76366 | Oil & Gas Operator | Mar 2005 |
| 198 | Kincaid/Hadden | Uvalde, TX 78802 | Oil & Gas Operator | Feb 1997 |
| 199 | Kindee Oil & Gas Texas, LLC | Houston, TX 77084 | Oil & Gas Operator | Apr 2016 |
| 200 | Kinder & Petty | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |