| 2101 | Centurion Oil & Gas Op. Co. Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 1998 |
| 2102 | Centurion Operating Corporation | Rockwall, TX 75087 | Oil & Gas Operator | Feb 2026 |
| 2103 | Centurion Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 2104 | Century Assets Corporation | Houston, TX 77056 | Oil Operator | Feb 2026 |
| 2105 | Century Exploration Houston, Inc | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2011 |
| 2106 | Century Exploration Houston, LLC | Austin, TX 78702 | Oil & Gas Operator | Jan 2016 |
| 2107 | Century Petroleum, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2026 |
| 2108 | Century Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 2109 | Century Royalty 2000 GP, LLC | Conroe, TX 77301 | Oil & Gas Operator | Jun 2020 |
| 2110 | Cerberus Engineering, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2026 |
| 2111 | Certified Petroleum Inc. | Mineral Wells, TX 76067 | Oil & Gas Operator | May 2006 |
| 2112 | Cesinger Exploration Service, In | Dallas, TX 75208 | Oil & Gas Operator | Mar 2006 |
| 2113 | Cet Energy Corporation | Spring, TX 77391 | Oil & Gas Operator | Nov 2003 |
| 2114 | Cex Operating Company | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 2115 | Cfo Resources, Inc. | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Feb 2026 |
| 2116 | CG Oil Co. | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2011 |
| 2117 | CG Operating, Inc. | Austin, TX 78759 | Oil & Gas Operator | Feb 2026 |
| 2118 | CG Technical Operating Co, LLC | Stamford, TX 79553 | Oil Operator | Feb 2026 |
| 2119 | CG&St Energy Services | Eastland, TX 76448 | Oil & Gas Operator | Oct 1999 |
| 2120 | CGS Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2023 |
| 2121 | CH-Seon Inc. | Dallas, TX 75251 | Oil & Gas Operator | Feb 2026 |
| 2122 | CH4 Energy II LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Dec 2025 |
| 2123 | CH4 Energy LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2006 |
| 2124 | CH4 Energy Six, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 2125 | Chain Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 2126 | Chalice Petroleum Corporation | Dallas, TX 75202 | Oil & Gas Operator | May 1998 |
| 2127 | Chalk, Otis, Estate | Big Spring, TX 79721 | Oil & Gas Operator | Jan 2006 |
| 2128 | Chalker Energy Management II,LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2008 |
| 2129 | Chalker Energy Management,LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2006 |
| 2130 | Chalker Operating Inc. | Richmond, TX 77406 | Oil & Gas Operator | Jul 2016 |
| 2131 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 2132 | Challenger Energy SVCS Co., LLC | Kilgore, TX 75663 | Oil Operator | Feb 2026 |
| 2133 | Challenger Oil Inc | San Antonio, TX 78209 | Gas Operator | Feb 2026 |
| 2134 | Chalmers Exploration Company | Abilene, TX 79608 | Oil & Gas Operator | Apr 1997 |
| 2135 | Chama Resources | Dallas, TX 75354 | Oil & Gas Operator | Apr 2009 |
| 2136 | Chambers Operating, Inc. | Westbrook, TX 79565 | Oil & Gas Operator | Mar 2006 |
| 2137 | Chambers, R. H. | Abilene, TX 79606 | Oil & Gas Operator | Apr 2006 |
| 2138 | Chambers, R. H. LLC | Abilene, TX 79606 | Oil & Gas Operator | Feb 2026 |
| 2139 | Champ Operating Company | Dallas, TX 75208 | Oil & Gas Operator | Oct 2020 |
| 2140 | Champion Lone Star Operating,LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2020 |
| 2141 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Dec 2025 |
| 2142 | Chan West Oil Corporation | Irving, TX 75016 | Oil & Gas Operator | Feb 2026 |
| 2143 | Chanc West, Inc. | Iraan, TX 79744 | Oil & Gas Operator | Mar 1995 |
| 2144 | Chance Energy Co. Inc. | Amarillo, TX 79114 | Oil & Gas Operator | Sep 1999 |
| 2145 | Chance Oil Co., Inc. | Vernon, TX 76385 | Oil & Gas Operator | Nov 2025 |
| 2146 | Chance Properties Co. | Kermit, TX 79745 | Oil & Gas Operator | Feb 2026 |
| 2147 | Chancellor, Earl Sales Co., Inc. | Sweetwater, TX 79556 | Oil & Gas Operator | Feb 2026 |
| 2148 | Chandler & Associates, Inc. | Denver, CO 80202 | Oil & Gas Operator | May 1997 |
| 2149 | Chandler Oil & Gas, LLC | Beeville, TX 78102 | Oil & Gas Operator | Feb 2026 |
| 2150 | Chaney Oil Company | Andrews, TX 79714 | Oil & Gas Operator | Feb 2026 |
| 2151 | Channa Operating, LLC | Houston, TX 77063 | Oil & Gas Operator | Jul 2021 |
| 2152 | Channel Production Company | Marshall, TX 75670 | Oil & Gas Operator | Feb 2026 |
| 2153 | Chanoco Corporation | San Antonio, TX 78205 | Oil & Gas Operator | Jan 1998 |
| 2154 | Chanze Oil Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 2155 | Chap Operating, Inc. | Knox City, TX 79529 | Oil & Gas Operator | Feb 2026 |
| 2156 | Chaparosa Production Company,Inc | Freer, TX 78357 | Oil & Gas Operator | Feb 2026 |
| 2157 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 2158 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Feb 2026 |
| 2159 | Chaparral Natural Resources,Inc. | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 2160 | Chaparral Operating, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Feb 2026 |
| 2161 | Chapco, Inc. | Benavides, TX 78341 | Oil & Gas Operator | Feb 2026 |
| 2162 | Chapman Oil Company | Midland, TX 79702 | Oil & Gas Operator | Nov 2025 |
| 2163 | Chapman, Ford Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jan 1996 |
| 2164 | Chapparal Operating Co. | Fort Worth, TX 76121 | Oil & Gas Operator | Feb 2026 |
| 2165 | Chapter Petroleum | Borger, TX 79008 | Oil & Gas Operator | Mar 1997 |
| 2166 | Chapter Petroleum, Inc. | Borger, TX 79008 | Oil & Gas Operator | Mar 2001 |
| 2167 | Chardonnay Operating, Inc. | Olney, TX 76374 | Oil & Gas Operator | Dec 1996 |
| 2168 | Charger Oil & Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2014 |
| 2169 | Charger Shale Oil Operating, LLC | Austin, TX 78704 | Oil & Gas Operator | Sep 2021 |
| 2170 | Charis Oil & Gas, LLC | Addison, TX 75001 | Oil & Gas Operator | Feb 2026 |
| 2171 | Charles A. Bird, Estate | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 2172 | Charles D. Self Operating, LLC | Jacksboro, TX 76458 | Oil Operator | Feb 2026 |
| 2173 | Charolais Energy, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 2174 | Charro Operating, L.L.C. | Englewood, CO 80112 | Oil & Gas Operator | Feb 2026 |
| 2175 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2026 |
| 2176 | Charter Petroleum Company | Abilene, TX 79605 | Oil & Gas Operator | Feb 2026 |
| 2177 | Chartex Petroleum Company | Houston, TX 77070 | Oil & Gas Operator | Aug 2000 |
| 2178 | Chase Avenue Corporation, The | Dallas, TX 75219 | Oil & Gas Operator | Jun 2003 |
| 2179 | Chase Energy, Inc. | Austin, TX 78763 | Oil & Gas Operator | Oct 2001 |
| 2180 | Chase Operating Company | Abilene, TX 79608 | Oil & Gas Operator | Feb 2016 |
| 2181 | Chase Production Company | Pampa, TX 79066 | Oil & Gas Operator | Feb 2026 |
| 2182 | Chasla Energy, LLC | Iowa Park, TX 76367 | Oil Operator | Feb 2026 |
| 2183 | Chass Production Co. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Nov 2020 |
| 2184 | Chateau Oil And Gas, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2017 |
| 2185 | CHB Interests, LLC | Kilgore, TX 75663 | Oil Operator | Oct 2011 |
| 2186 | CHB Investments | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2004 |
| 2187 | Cheatham Well Service, Inc. | Luling, TX 78648 | Oil Operator | Feb 2026 |
| 2188 | Cheatham, Joe R. Oil Co. | Lockhart, TX 78644 | Oil & Gas Operator | Dec 2018 |
| 2189 | Cheatham, W. C. | Olney, TX 76374 | Oil & Gas Operator | Feb 2002 |
| 2190 | Cheetah Investments, Inc. | Winters, TX 79567 | Oil & Gas Operator | Feb 2026 |
| 2191 | Chek Oil Co. | Midland, TX 79708 | Oil & Gas Operator | May 2019 |
| 2192 | Chek Oil Co., LLC | Midland, TX 79704 | Oil Operator | Feb 2026 |
| 2193 | Chemily Management Company | Cypress, TX 77429 | Oil & Gas Operator | Apr 2023 |
| 2194 | Chenango Oil And Gas Co. | Groves, TX 77619 | Oil & Gas Operator | Feb 2026 |
| 2195 | Chenoweth, Grover | Marble Falls, TX 78654 | Oil & Gas Operator | Dec 2024 |
| 2196 | Cherco Properties, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Nov 1999 |
| 2197 | Cherokee DRLG. & Dev. Corp. | Winnetka, IL 60093 | Oil & Gas Operator | Jan 2003 |
| 2198 | Cherokee Operating | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 2199 | Cherokee Production Corp. | Greenville, TX 75401 | Oil & Gas Operator | Feb 2026 |
| 2200 | Cherokee Production LLC | Goliad, TX 77963 | Oil Operator | Feb 2026 |