| 2101 | Contango Midstream Company | Houston, TX 77002-3023 | Oil & Gas Operator | Mar 2025 |
| 2102 | Contango Operators, Inc. | Houston, TX 77098 | Oil & Gas Operator | Dec 2022 |
| 2103 | Contango Operators, LLC | | Oil & Gas Operator | Nov 2024 |
| 2104 | Contango Resources Company | | Oil & Gas Operator | Mar 2009 |
| 2105 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Jun 2025 |
| 2106 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 2107 | Contango Rocky Mountain Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2020 |
| 2108 | Continental Brok | | Oil Operator | Oct 1994 |
| 2109 | Continental Ener | | Oil & Gas Operator | Dec 1996 |
| 2110 | Continental Energy | Garden City, KS 67846-0918 | Oil & Gas Operator | Jul 2017 |
| 2111 | Continental Energy Operating LLC | Tulsa, OK 74114-1302 | Oil & Gas Operator | Apr 2025 |
| 2112 | Continental Expl | | Oil Operator | Sep 1991 |
| 2113 | Continental Exploration LLC | Lufkin, TX 75915 | Oil & Gas Operator | Jun 2025 |
| 2114 | Continental Exploration, Inc. | | Oil Operator | Dec 2001 |
| 2115 | Continental Export Corporation | Bowie, TX 76230 | Oil & Gas Operator | Sep 2013 |
| 2116 | Continental Gas Inc | Enid, OK 73702-5103 | Oil & Gas Operator | Apr 2012 |
| 2117 | Continental Industries LC | Casper, WY 82602 | Oil & Gas Operator | Feb 2008 |
| 2118 | Continental Oil | | Oil Operator | Jun 1985 |
| 2119 | Continental Oil & Gas Co. Inc. | | Oil & Gas Operator | Jul 1997 |
| 2120 | Continental Oil & Refining Co | Catoosa, OK 74015-0831 | Oil & Gas Operator | Nov 2024 |
| 2121 | Continental Oil Co. | Durango, CO 81301 | Oil & Gas Operator | Dec 1983 |
| 2122 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Jun 2025 |
| 2123 | Continental Petroleum, LLC | | Oil & Gas Operator | Oct 2013 |
| 2124 | Continental Production Co LLC | Greenwood VIllage, CO 80155 | Oil & Gas Operator | Aug 2012 |
| 2125 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Jun 2025 |
| 2126 | Continental Trend Resources, Inc | Oklahoma City, OK 73126 | Oil & Gas Operator | Jun 2025 |
| 2127 | Continental U.S. Management Corp | Dallas, TX 75240 | Oil & Gas Operator | Oct 2016 |
| 2128 | Continental-Emsco Co | Hobbs, NM 88241 | Oil & Gas Operator | Jun 1995 |
| 2129 | Continual Oil & Gas, Inc. | Abilene, TX 79602 | Oil & Gas Operator | Jun 2025 |
| 2130 | Continuum Midstream, LLC | Tulsa, OK 74136 | Oil Operator | Feb 2025 |
| 2131 | Contour Energy E & P, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 2132 | Contour Energy E & P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2003 |
| 2133 | Contour Expl And Prod, LLC | Dallas, TX 75204 | Oil & Gas Operator | Jun 2025 |
| 2134 | Contour Oil & Gas, LLC | Abilene, TX 79602 | Oil & Gas Operator | Dec 2015 |
| 2135 | Contract Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Oct 2012 |
| 2136 | Contract Oil & Gas Service Co. | Tomball, TX 77375 | Oil & Gas Operator | Apr 2007 |
| 2137 | Contrast Energy, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jun 2025 |
| 2138 | Contreras Al Consultants Inc | Oklahoma City, OK 73113-0762 | Oil & Gas Operator | Oct 2020 |
| 2139 | Converse Oil Corp. | | Oil Operator | Dec 2010 |
| 2140 | Convert Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2019 |
| 2141 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 2142 | Conway Energy Oper Services Inc. | San Diego, TX 78384 | Oil & Gas Operator | Jun 2025 |
| 2143 | Cook D L | Holliday, TX 76366 | Oil & Gas Operator | Dec 2008 |
| 2144 | Cook Energy Inc | Cooksburg, PA 16217-0054 | Oil & Gas Operator | Dec 2004 |
| 2145 | Cook Exploration Co. | Longview, TX 75602 | Oil & Gas Operator | Jun 2025 |
| 2146 | Cook Inlet Energy, LLC. | | Oil & Gas Operator | Apr 2025 |
| 2147 | Cook L D | Bartlesville, OK 74005-2306 | Oil & Gas Operator | Nov 2005 |
| 2148 | Cook Marshall Operating, Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 1995 |
| 2149 | Cook Oil Company | Wewoka, OK 74884 | Oil & Gas Operator | Sep 2015 |
| 2150 | Cook Operating C | | Oil Operator | May 1987 |
| 2151 | Cook Production LLC | | Oil Operator | Jan 2025 |
| 2152 | Cook Robert L | Rockwall, TX 75087-0892 | Oil & Gas Operator | Mar 2015 |
| 2153 | Cook W R Inc | Duncan, OK 73534-0069 | Oil & Gas Operator | Jun 2000 |
| 2154 | Cook William Glenn | Wewoka, OK 74884-0727 | Oil & Gas Operator | Nov 2000 |
| 2155 | Cook, James A. | Augusta, KS 67010 | Oil Operator | Jul 1997 |
| 2156 | Cook, Kenneth D. Operator | Midland, TX 79707 | Oil Operator | Jun 2025 |
| 2157 | Cook, Lee J. | Penn Yan, NY 14527 | Gas Operator | Dec 2023 |
| 2158 | Cooke & Montague Oper. Co., Inc. | Flower Mound, TX 75028 | Oil & Gas Operator | Jun 2025 |
| 2159 | Cooke County Production Company | Shawnee, OK 74801-1800 | Oil & Gas Operator | Jan 2022 |
| 2160 | Cooke Energy Company | San Antonio, TX 78250 | Oil & Gas Operator | Jul 2012 |
| 2161 | Cooke, Donald E./Lee Wanda | Coffeyville, KS 67331 | Oil Operator | Dec 2001 |
| 2162 | Cooke, Kenny D. Operating | Ballinger, TX 76821 | Oil & Gas Operator | Mar 2004 |
| 2163 | Cool Spring Colony, Inc. | Rudyard, MT 59540 | Gas Operator | Mar 2025 |
| 2164 | Coolidge, G. B., Inc. | Shelby, MT 59474 | Oil & Gas Operator | Aug 2016 |
| 2165 | Coolidge, Paul | | Oil Operator | Feb 2025 |
| 2166 | Coolidge, Timothy J & Billiette Nebel | Kevin, MT 59454 | Oil Operator | Feb 2025 |
| 2167 | Coolspring Gas & Oil Co LLC | Coolspring, PA 15730-8524 | Gas Operator | Dec 2024 |
| 2168 | Coomer, Mitchell | Columbia, KY 42728 | Oil Operator | Dec 2023 |
| 2169 | Coon Creek Gas Inc | | Oil & Gas Operator | Mar 2014 |
| 2170 | Coop Energy, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jun 2025 |
| 2171 | Cooper & Brain Inc. | | Oil & Gas Operator | Apr 2025 |
| 2172 | Cooper A L & Mae C | | Oil & Gas Operator | Jan 2001 |
| 2173 | Cooper Energy Corp | | Oil & Gas Operator | Jun 1995 |
| 2174 | Cooper John T | Duncan, OK 73534 | Oil & Gas Operator | Sep 2014 |
| 2175 | Cooper Lisa L | Cushing, OK 74023 | Oil & Gas Operator | Mar 2015 |
| 2176 | Cooper Mineral Group Inc | Bellaire, TX 77401 | Oil & Gas Operator | Feb 2004 |
| 2177 | Cooper Oil & Gas, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2010 |
| 2178 | Cooper Oil & Gas, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jun 2025 |
| 2179 | Cooper Oil Company | Andover, KS 67002 | Oil Operator | Oct 1997 |
| 2180 | Cooper Oil Inc | Duncan, OK 73534 | Oil & Gas Operator | Sep 2014 |
| 2181 | Cooper Operating | Olney, TX 76374 | Oil Operator | Apr 2007 |
| 2182 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2025 |
| 2183 | Cooper Production Company | New Braunfels, TX 78132 | Oil & Gas Operator | Sep 2021 |
| 2184 | Cooper Service Co. | | Oil & Gas Operator | Nov 2024 |
| 2185 | Cooper, Glenn W. Oil & Gas | Seymour, TX 76380 | Oil & Gas Operator | Feb 2000 |
| 2186 | Cooper, J. M. | Winfield, KS 67119 | Oil Operator | Oct 1997 |
| 2187 | Cooper, Lowell E. | Peabody, KS 66866 | Oil Operator | Nov 1987 |
| 2188 | Coors Energy | Golden, CO 80402-0467 | Oil & Gas Operator | Sep 1992 |
| 2189 | Coots, Jesse | Le Roy, NY 14482 | Gas Operator | Dec 2023 |
| 2190 | Copano Company | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 2191 | Copano Gas Unit | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 2192 | Cope Oil Company | Valley VIew, TX 76272 | Oil & Gas Operator | Feb 2015 |
| 2193 | Copeland Gas LLC | Albion, PA 16401 | Gas Operator | Dec 2024 |
| 2194 | Copestone Operating, LLC | Houston, TX 77019 | Oil & Gas Operator | Jun 2025 |
| 2195 | Copper Land Resources LLC | | Oil Operator | Mar 2025 |
| 2196 | Copper Ridge Oil Inc | Olean, NY 14760 | Oil & Gas Operator | Dec 2023 |
| 2197 | Copper Ridge Resources LLC | Midland, TX 79710 | Oil Operator | Feb 2025 |
| 2198 | Copperhead Creek Enterprises, Inc. | Chautauqua, KS 67334 | Oil Operator | Sep 2019 |
| 2199 | Copperhead Enterprises LLC | Ludlow, PA 16333-0057 | Oil & Gas Operator | Dec 2024 |
| 2200 | Copperhead Oil | Colony, KS 66015 | Oil Operator | Sep 1985 |