| 101 | Amarex Incorpora | | Oil Operator | Feb 1985 |
| 102 | Amarillo Exploration, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Dec 2025 |
| 103 | Amax Petroleum C | | Oil & Gas Operator | Aug 1986 |
| 104 | Amber Oil Compan | | Oil Operator | Aug 1995 |
| 105 | Ambrotra Energy LLC | Medicine Lodge, KS 67104 | Oil Operator | May 2025 |
| 106 | Amcon Resources | Oklahoma City, OK 73102 | Gas Operator | Jul 2000 |
| 107 | Amcon Resources, Inc. | Oklahoma City, OK 73101 | Gas Operator | Jun 2016 |
| 108 | American Energie | | Oil & Gas Operator | May 1995 |
| 109 | American Energies Pipeline, LLC | Dallas, TX 75207 | Oil & Gas Operator | Jan 2015 |
| 110 | American Energy | Abilene, TX 79604 | Oil & Gas Operator | Jul 2004 |
| 111 | American Energy Resources, LLC | Belton, MO 64012 | Oil Operator | Nov 2023 |
| 112 | American Explora | | Gas Operator | Apr 1994 |
| 113 | American Exploration | Houston, TX 77010 | Gas Operator | Apr 1994 |
| 114 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 115 | American Land And Energy LLC | Castle Pines, CO 80108 | Oil Operator | Jun 2025 |
| 116 | American Lariat | | Oil Operator | Jun 1994 |
| 117 | American Oilfield Systems, Inc. | Nichols Hill, OK 73116 | Oil & Gas Operator | Jun 2001 |
| 118 | American Petrole | | Oil & Gas Operator | Dec 1996 |
| 119 | American Petroleum Exploration Corp. | Wichita, KS 67201 | Gas Operator | Feb 2002 |
| 120 | American Star Energy Services, LLC | Tulsa, OK 74152 | Gas Operator | Jun 2025 |
| 121 | American Tank Service LLC | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 122 | American Trad.&Prod. | | Oil Operator | Dec 1995 |
| 123 | American Trading | | Oil & Gas Operator | Dec 1995 |
| 124 | American Warrior | | Oil & Gas Operator | Jun 2025 |
| 125 | American Warrior Inc | Garden City, KS 67846 | Oil & Gas Operator | Aug 2025 |
| 126 | Americase Production Co. | Dallas, TX 75252 | Oil Operator | May 2002 |
| 127 | Amerikan Oil, LLC | Mound City, KS 66056 | Oil Operator | Jun 2025 |
| 128 | Amerkan Resource | | Oil Operator | Jan 1994 |
| 129 | Amoco Production | | Oil & Gas Operator | Jun 2012 |
| 130 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 131 | Amos, Joe | Wichita, KS 67233 | Oil Operator | Jul 1990 |
| 132 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 133 | Anadarko Petrole | | Oil & Gas Operator | Dec 1996 |
| 134 | Anadarko Petroleum | | Oil & Gas Operator | Oct 2007 |
| 135 | Anadarko Petroleum Co | Houston, TX 77227 | Oil & Gas Operator | Feb 1998 |
| 136 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Sep 2025 |
| 137 | Anadarko Prod | | Oil & Gas Operator | Dec 1996 |
| 138 | Anadarko Production Co. | | Oil Operator | Feb 1989 |
| 139 | Anchor Bay Corporation | Denver, CO 80202 | Oil & Gas Operator | Jun 2007 |
| 140 | Anchor Bay Petroleum | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 141 | Anchor Bay Petroleum LLC | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 142 | Anderson Art Tan | | Oil Operator | Jul 1988 |
| 143 | Anderson Energy Inc | Wichita, KS 67278 | Oil & Gas Operator | Apr 2025 |
| 144 | Anderson Kent | | Oil Operator | Dec 2009 |
| 145 | Anderson Oil LTD. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2025 |
| 146 | Anderson Thornto | | Oil & Gas Operator | Mar 1995 |
| 147 | Anderson, Jerry | Floydada, TX 79235 | Oil & Gas Operator | Jun 2025 |
| 148 | Anderson, Kendra A. | Galva, KS 67443 | Oil Operator | Jun 2025 |
| 149 | Andover Oil Comp | | Oil & Gas Operator | Oct 1989 |
| 150 | Angle Exploratio | | Oil Operator | Jan 1987 |
| 151 | Angle George A | | Gas Operator | Dec 1986 |
| 152 | Angle Oil Compan | | Oil Operator | Jun 1994 |
| 153 | Angle Oil Company | Hays, KS 67601 | Oil Operator | Sep 2002 |
| 154 | Anshutz Oil | | Oil Operator | Dec 2009 |
| 155 | Anstine & Musgrove Inc | Ponca City, OK 74602 | Oil & Gas Operator | Sep 2025 |
| 156 | Anstine Oil Company | | Oil Operator | Jun 2025 |
| 157 | Anstine-Musgrove | Ponca City, OK 74602 | Oil & Gas Operator | Feb 2017 |
| 158 | Antares Oil Corp | Denver, CO 80202 | Oil & Gas Operator | Oct 2015 |
| 159 | Ap Operating LLC | Claflin, KS 67525 | Oil Operator | May 2025 |
| 160 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 161 | Apache Drilling | | Oil Operator | Sep 1994 |
| 162 | Apache Drilling Co | Kingman, KS 67068 | Oil Operator | Feb 2006 |
| 163 | Apex Operating Company, Inc. | Denver, CO 80202 | Gas Operator | Mar 2003 |
| 164 | Apex Resources LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 165 | Apollo Energies | Pratt, KS 67124 | Oil Operator | Aug 2016 |
| 166 | Apollo Energies Inc | Pratt, KS 67124 | Oil & Gas Operator | Jun 2025 |
| 167 | Apx Corporation | Houston, TX 77251 | Oil & Gas Operator | Dec 2009 |
| 168 | Aquila Resources | Burkesville, KY 42717 | Oil & Gas Operator | Dec 2022 |
| 169 | Arbuckle Energy Inc. | Wichita, KS 67202 | Oil & Gas Operator | Jun 2025 |
| 170 | Arbuckle Enterprises Inc | Edmond, OK 73083 | Oil & Gas Operator | Aug 2025 |
| 171 | Arbuckle Service | Iola, KS 66749 | Oil Operator | Feb 1993 |
| 172 | Arbuckle, A. Dale | Grenola, KS 67346 | Oil Operator | Sep 1990 |
| 173 | Arbuckle, A. Dale & Kathryn E. Rev Trust | Grenola, KS 67346 | Oil & Gas Operator | May 2024 |
| 174 | Arcadian Resources LLC | Glen Elder, KS 67446 | Oil & Gas Operator | Dec 2025 |
| 175 | Archer, Carl M. | Spearman, TX 79081 | Oil & Gas Operator | Feb 2005 |
| 176 | Arco Oil & Gas C | | Oil & Gas Operator | Dec 1992 |
| 177 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 178 | Arcturus Oil Cor | | Oil Operator | Oct 1989 |
| 179 | Ardc Inc. | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 180 | Area Management Corp | Prairie VIllage, KS 66207 | Oil Operator | Dec 2019 |
| 181 | Arena Resources Inc | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 182 | Ares Energy, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 183 | Argali Resources | Dallas, TX 75206 | Oil & Gas Operator | Apr 2003 |
| 184 | Argas Incorporat | | Oil & Gas Operator | Aug 1995 |
| 185 | Argent Energy (Us) Holdings Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Sep 2021 |
| 186 | Argent Energy In | | Oil Operator | Feb 1994 |
| 187 | Argent Energy, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Dec 2019 |
| 188 | Argonaut Energy | | Oil & Gas Operator | Aug 1991 |
| 189 | Aries Operating, LP | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 190 | Arizona Oil Comp | | Oil Operator | Oct 1984 |
| 191 | Arlian, Inc. | Denver, CO 80202 | Oil Operator | Feb 1998 |
| 192 | Armada Operating, LLC | Dallas, TX 75254 | Oil Operator | Aug 2015 |
| 193 | Armadilla Oil & Gas, LLC | Madison, KS 66860 | Oil Operator | Jun 2025 |
| 194 | Armor Petroleum, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 195 | Armstrong & Jack | | Gas Operator | Jun 1997 |
| 196 | Arnold Prodn. | | Oil & Gas Operator | Jan 2006 |
| 197 | Arp Operating, LLC | Denver, CO 80202 | Oil Operator | Jun 2025 |
| 198 | Arps Petroleum C | | Oil Operator | Jul 1987 |
| 199 | Arrow Oil & Gas, Inc. | Norman, OK 73070 | Oil Operator | Mar 2010 |
| 200 | Arrow Oil Operat | | Oil Operator | Nov 1991 |