| 101 | Callon Offshore Production, Inc. | Natchez, MS 39121 | Oil & Gas Operator | Dec 2005 |
| 102 | Callon Permian II, LLC | Houston, TX 77056 | Oil & Gas Operator | Jul 2024 |
| 103 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 104 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 105 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 106 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2006 |
| 107 | Caltex Energy Co. | Luling, TX 78648 | Oil & Gas Operator | Oct 2025 |
| 108 | Calto Operating Company, Inc. | Dallas, TX 75225 | Oil & Gas Operator | May 2004 |
| 109 | Calumet Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2019 |
| 110 | Cam Company | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 2004 |
| 111 | Cambrian Management LTD | McCaulley, TX 79534 | Oil & Gas Operator | Oct 2025 |
| 112 | Cambridge Production, Inc. | Amarillo, TX 79120 | Oil & Gas Operator | Nov 2020 |
| 113 | Camco Saltwater Transport | George West, TX 78022 | Oil Operator | Feb 2015 |
| 114 | Camco Saltwater Transport,L.L.C. | George West, TX 78022 | Oil Operator | Oct 2025 |
| 115 | Camden Oil & Gas, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Dec 2005 |
| 116 | Camden Reserves, Inc. | Houston, TX 77019 | Oil & Gas Operator | Mar 2011 |
| 117 | Camden Resources, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Apr 2008 |
| 118 | Camden Resources, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Dec 2015 |
| 119 | Camelot Oil And Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2003 |
| 120 | Cameron Engineering, Inc | Montgomery, TX 77356 | Oil & Gas Operator | Jun 2003 |
| 121 | Cameron Exploration, Inc. | Longview, TX 75604 | Oil & Gas Operator | Oct 2025 |
| 122 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 123 | Caminar Oil & Gas, LLC | Abilene, TX 79602 | Oil & Gas Operator | Aug 2024 |
| 124 | Camino Real Technologies Inc | Temple, TX 76502 | Oil Operator | Oct 2025 |
| 125 | Camoil, Inc. | Columbus, TX 78934 | Oil & Gas Operator | Oct 2025 |
| 126 | Campana Petroleum Company | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 127 | Campbell Energy LLC | Carmi, IL 62821 | Oil Operator | Jun 2025 |
| 128 | Campbell, George M. | Lubbock, TX 79490 | Oil & Gas Operator | Apr 2003 |
| 129 | Campbell, T. K. | Fort Worth, TX 76118 | Oil & Gas Operator | Mar 2006 |
| 130 | Campsey Minerals | Jacksboro, TX 76458 | Oil & Gas Operator | Oct 2025 |
| 131 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Oct 2025 |
| 132 | Can'T Complain Operating Co. | Georgetown, TX 78633 | Oil & Gas Operator | Oct 2025 |
| 133 | Can-Tex Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Nov 2003 |
| 134 | Canadian River Trading Co II | Katy, TX 77449 | Oil & Gas Operator | Oct 2025 |
| 135 | Canan Mowrey Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 136 | Canan Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 137 | Candelero Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 138 | Candleridge Oil, Inc. | Fort Worth, TX 76109 | Oil & Gas Operator | Jun 2003 |
| 139 | Cannan, Morris | San Antonio, TX 78205 | Oil & Gas Operator | Oct 2025 |
| 140 | Cannon Operating Company LLC | Garland, TX 75043 | Oil Operator | Oct 2025 |
| 141 | Cantera Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Nov 2017 |
| 142 | Cantrell Oil Co. | Elbert, TX 76359 | Oil & Gas Operator | Aug 2003 |
| 143 | Cantro Exploration, Inc. | San Antonio, TX 78270 | Oil & Gas Operator | May 2000 |
| 144 | Cantu Operating, LLC | McAllen, TX 78504 | Oil Operator | Oct 2025 |
| 145 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Jul 2025 |
| 146 | Canyon Creek Energy Texas, LLC | Tulsa, OK 74136 | Oil & Gas Operator | May 2017 |
| 147 | Canyon Creek Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2025 |
| 148 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Jun 2025 |
| 149 | Canyon Oil & Gas Exploration LLC | San Antonio, TX 78258 | Oil & Gas Operator | May 2002 |
| 150 | Canyon Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 151 | Canyon Operating Unit | San Angelo, TX 76904 | Oil & Gas Operator | Sep 1995 |
| 152 | Canyon Reef Brine LLC | Snyder, TX 79550 | Oil Operator | Oct 2025 |
| 153 | Canyon Ridge Energy LLC | Iowa Park, TX 76367 | Oil Operator | Nov 2024 |
| 154 | Cap Operating Inc. | Borger, TX 79008 | Oil & Gas Operator | Oct 2025 |
| 155 | Capataz Operating Inc | Midland, TX 79702 | Oil & Gas Operator | Sep 2020 |
| 156 | Capco Offshore Of Texas, Inc. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 157 | Capco Offshore, Inc. | Irving, TX 75063 | Oil & Gas Operator | May 2012 |
| 158 | Capco Resources Corporation | Irving, TX 75016 | Oil & Gas Operator | Mar 2004 |
| 159 | Capco Resources Of Texas, Inc | Irving, TX 75063 | Oil & Gas Operator | Jun 2003 |
| 160 | Cape Operating, Inc. | Longview, TX 75608 | Oil & Gas Operator | Nov 2007 |
| 161 | Cape, Randy | Tyler, TX 75703 | Oil & Gas Operator | Mar 2008 |
| 162 | Capio Oil & Gas, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2015 |
| 163 | Capital A Corp. | San Antonio, TX 78279 | Oil & Gas Operator | Jun 2002 |
| 164 | Capital Star Oil & Gas, Inc. | Houston, TX 77027 | Oil & Gas Operator | Oct 2025 |
| 165 | Capitan Energy, Incorporated | Carlsbad, NM 88221 | Oil & Gas Operator | Oct 2025 |
| 166 | Capitol Operating & Expl., Inc. | Austin, TX 78766 | Oil & Gas Operator | Feb 2001 |
| 167 | Capitol Well Servicing Co., Inc. | Oklahoma City, OK 73143 | Oil & Gas Operator | May 2023 |
| 168 | Capps, R. Oil Corp. | Midland, TX 79704 | Oil & Gas Operator | Oct 2002 |
| 169 | Caprock Energy, Inc. | Denton, TX 76205 | Oil & Gas Operator | Apr 1993 |
| 170 | Caprock Engineering, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Nov 2018 |
| 171 | Caprock Exploration, Inc. | Monahans, TX 79756 | Oil & Gas Operator | Oct 2025 |
| 172 | Caprock Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Dec 2007 |
| 173 | Caprock, Inc. | Ralls, TX 79357 | Oil & Gas Operator | Mar 2013 |
| 174 | Capstone Cactus Operating Comp. | Hennessey, OK 73742 | Oil & Gas Operator | Oct 2025 |
| 175 | Capstone Natural Res II, LLC | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2020 |
| 176 | Capstone Natural Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | May 2015 |
| 177 | Capturepoint LLC | Allen, TX 75013 | Oil & Gas Operator | Oct 2025 |
| 178 | Caraway Operating Co. | San Angelo, TX 76902 | Oil & Gas Operator | Oct 2025 |
| 179 | Caraway, Robert | Cisco, TX 76437 | Oil & Gas Operator | Oct 2025 |
| 180 | Caraway, Robert R. | Cisco, TX 76437 | Oil & Gas Operator | Oct 2025 |
| 181 | Carbon Economy LLC | Chickasha, OK 73023 | Oil & Gas Operator | Jul 2025 |
| 182 | Carbon Field Energy, L.L.C. | Kilgore, TX 75663 | Oil Operator | Apr 2019 |
| 183 | Carbon Oil Inc | Vidor, TX 77670 | Oil & Gas Operator | Oct 2025 |
| 184 | Carburante Exploration Co, LTD. | Granbury, TX 76048 | Oil & Gas Operator | Oct 2025 |
| 185 | Card Operating Company, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Dec 1995 |
| 186 | Cardinal Energy Company | Rowlett, TX 75088 | Oil & Gas Operator | Oct 2025 |
| 187 | Cardinal Operating Corporation | Waxahachie, TX 75165 | Oil & Gas Operator | Jan 1997 |
| 188 | Cardinal Producing Co. | Abilene, TX 79606 | Oil & Gas Operator | Aug 2003 |
| 189 | Cardinal Shares, Inc. | West Bloomfld, MI 48322 | Oil & Gas Operator | Mar 2004 |
| 190 | Cardwell Oil Corporation | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 191 | Cardwell'S U Bar Oil | Manor, TX 78653 | Oil & Gas Operator | Oct 2025 |
| 192 | Carey, Shirley L. Trust | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 193 | Caribbean Energy LLC II | Cotulla, TX 78014 | Oil & Gas Operator | Oct 2025 |
| 194 | Caribbean Energy, L.L.C. | Cotulla, TX 78014 | Oil & Gas Operator | Nov 2019 |
| 195 | Caribe Production Corporation | Nichols Hill, OK 73116 | Oil & Gas Operator | Dec 1993 |
| 196 | Caribou Operating Co. | Granbury, TX 76048 | Oil & Gas Operator | Mar 2010 |
| 197 | Caribou Operating, Inc. | Granbury, TX 76048 | Oil & Gas Operator | Oct 2025 |
| 198 | Carken LLC | Andrews, TX 79714 | Oil Operator | Oct 2025 |
| 199 | Carl Oil & Gas Co. | Bakersfield, CA 93309 | Oil & Gas Operator | Dec 1995 |
| 200 | Carlon Oil & Gas Co Inc | Derby, KS 67037 | Gas Operator | Dec 2024 |