| 2101 | Cons Asset MGMT SVCS E&P Op, LLC | Houston, TX 77002 | Oil Operator | Dec 2017 |
| 2102 | Considine, Barry | Burrton, KS 67020 | Gas Operator | Dec 2024 |
| 2103 | Consol Gas Company | Canonsburg, PA 15317 | Oil & Gas Operator | Dec 2021 |
| 2104 | Consol Oil Recvry/Ener Co Inc | Cushing, OK 74023 | Oil Operator | Nov 1993 |
| 2105 | Consolidated Energy Inv., Inc. | | Oil & Gas Operator | Oct 2013 |
| 2106 | Consolidated Energy Res., Inc. | | Oil Operator | Jun 1992 |
| 2107 | Consolidated Engy Reserve Inc | | Oil & Gas Operator | Jul 1991 |
| 2108 | Consolidated Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 2109 | Consolidated Gas & Energy Corp. | San Diego, CA 92130 | Oil Operator | Apr 2012 |
| 2110 | Consolidated Investments | Seminole, OK 74868 | Oil & Gas Operator | Jan 2025 |
| 2111 | Consolidated Natural Res. Corp. | Kilgore, TX 75662 | Oil & Gas Operator | Jan 2016 |
| 2112 | Consolidated Oil | | Oil Operator | Jul 1996 |
| 2113 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 2114 | Consolidated Oil Well Services, Inc | Chanute, KS 66720 | Oil Operator | Jan 2008 |
| 2115 | Consolidated Peto Equity LTD | La Crescenta, CA 91214 | Oil & Gas Operator | Dec 1996 |
| 2116 | Consolidated Petro PTNRS I, LLC | Austin, TX 78759 | Oil & Gas Operator | Mar 2003 |
| 2117 | Consolidated Petrol Corp | Columbus, OH 43215 | Oil & Gas Operator | Dec 1995 |
| 2118 | Consolidated Properties | Tulsa, OK 74129 | Oil & Gas Operator | Jan 2017 |
| 2119 | Consolidated Res Of Amer | Cincinnati, OH 45208 | Oil & Gas Operator | Dec 1996 |
| 2120 | Consolidated Resources Corp | Shawnee, OK 74801 | Oil & Gas Operator | Sep 2014 |
| 2121 | Consolidated Resources Inc | | Oil & Gas Operator | May 2004 |
| 2122 | Consolidation Coal Company | Saint Clairsville, OH 43950-8742 | Oil & Gas Operator | Dec 2020 |
| 2123 | Consortium Energy LLC | Tallmadge, OH 44278 | Oil & Gas Operator | Dec 2024 |
| 2124 | Constitution Gas Transport Co., Inc. | Salt Lake City, UT 84124-1110 | Gas Operator | Jun 2012 |
| 2125 | Constitution Investment Co LLC | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 2126 | Constitution Petroleum | Salt Lake City, UT 84124-1110-1110 | Oil & Gas Operator | Dec 2008 |
| 2127 | Consumers Energy Co | | Oil & Gas Operator | Apr 2010 |
| 2128 | Contango Midstream Company | Houston, TX 77002-3023 | Oil & Gas Operator | Feb 2025 |
| 2129 | Contango Operators, Inc. | Houston, TX 77098 | Oil & Gas Operator | Dec 2022 |
| 2130 | Contango Operators, LLC | | Oil & Gas Operator | Nov 2024 |
| 2131 | Contango Resources Company | | Oil & Gas Operator | Mar 2009 |
| 2132 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Apr 2025 |
| 2133 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2025 |
| 2134 | Contango Rocky Mountain Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2020 |
| 2135 | Continental Brok | | Oil Operator | Oct 1994 |
| 2136 | Continental Ener | | Oil & Gas Operator | Dec 1996 |
| 2137 | Continental Energy | Garden City, KS 67846-0918 | Oil & Gas Operator | Jul 2017 |
| 2138 | Continental Energy Operating LLC | Tulsa, OK 74114-1302 | Oil & Gas Operator | Feb 2025 |
| 2139 | Continental Expl | | Oil Operator | Sep 1991 |
| 2140 | Continental Exploration, Inc. | | Oil Operator | Dec 2001 |
| 2141 | Continental Exploration, L.L.C. | Lufkin, TX 75915 | Oil & Gas Operator | Apr 2025 |
| 2142 | Continental Export Corporation | Bowie, TX 76230 | Oil & Gas Operator | Sep 2013 |
| 2143 | Continental Gas Inc | Enid, OK 73702-5103 | Oil & Gas Operator | Apr 2012 |
| 2144 | Continental Industries LC | Casper, WY 82602 | Oil & Gas Operator | Feb 2008 |
| 2145 | Continental Natural Gas, Inc. | Tulsa, OK 74121 | Oil & Gas Operator | Jun 2018 |
| 2146 | Continental Oil | | Oil Operator | Jun 1985 |
| 2147 | Continental Oil & Gas Co. Inc. | | Oil & Gas Operator | Jul 1997 |
| 2148 | Continental Oil & Refining Co | Catoosa, OK 74015-0831 | Oil & Gas Operator | Nov 2024 |
| 2149 | Continental Oil Co. | Durango, CO 81301 | Oil & Gas Operator | Dec 1983 |
| 2150 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 2151 | Continental Petroleum, LLC | | Oil & Gas Operator | Oct 2013 |
| 2152 | Continental Production Co LLC | Greenwood VIllage, CO 80155 | Oil & Gas Operator | Aug 2012 |
| 2153 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2025 |
| 2154 | Continental Trend Resources, Inc | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2025 |
| 2155 | Continental U.S. Management Corp | Dallas, TX 75240 | Oil & Gas Operator | Oct 2016 |
| 2156 | Continental-Emsco Co | Hobbs, NM 88241 | Oil & Gas Operator | Jun 1995 |
| 2157 | Continual Oil & Gas, Inc. | Abilene, TX 79602 | Oil & Gas Operator | Apr 2025 |
| 2158 | Continuum Midstream LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2024 |
| 2159 | Contour Energy E & P, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 2160 | Contour Energy E & P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2003 |
| 2161 | Contour Expl And Prod, LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2025 |
| 2162 | Contour Oil & Gas, LLC | Abilene, TX 79602 | Oil & Gas Operator | Dec 2015 |
| 2163 | Contract Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Oct 2012 |
| 2164 | Contract Oil & Gas Service Co. | Tomball, TX 77375 | Oil & Gas Operator | Apr 2007 |
| 2165 | Contrast Energy, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2025 |
| 2166 | Contreras Al Consultants Inc | Oklahoma City, OK 73113-0762 | Oil & Gas Operator | Oct 2020 |
| 2167 | Converse Oil Corp. | | Oil Operator | Dec 2010 |
| 2168 | Convert Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2019 |
| 2169 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 2170 | Conway Energy Oper Services Inc. | San Diego, TX 78384 | Oil & Gas Operator | Apr 2025 |
| 2171 | Cook D L | Holliday, TX 76366 | Oil & Gas Operator | Dec 2008 |
| 2172 | Cook Energy Inc | Cooksburg, PA 16217-0054 | Oil & Gas Operator | Dec 2004 |
| 2173 | Cook Exploration Co. | Longview, TX 75602 | Oil & Gas Operator | Apr 2025 |
| 2174 | Cook Inlet Energy, LLC. | | Oil & Gas Operator | Feb 2025 |
| 2175 | Cook L D | Bartlesville, OK 74005-2306 | Oil & Gas Operator | Nov 2005 |
| 2176 | Cook Marshall Operating, Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 1995 |
| 2177 | Cook Oil Company | Wewoka, OK 74884 | Oil & Gas Operator | Sep 2015 |
| 2178 | Cook Operating C | | Oil Operator | May 1987 |
| 2179 | Cook Production LLC | | Oil Operator | Jan 2025 |
| 2180 | Cook Robert L | Rockwall, TX 75087-0892 | Oil & Gas Operator | Mar 2015 |
| 2181 | Cook W R Inc | Duncan, OK 73534-0069 | Oil & Gas Operator | Jun 2000 |
| 2182 | Cook William Glenn | Wewoka, OK 74884-0727 | Oil & Gas Operator | Nov 2000 |
| 2183 | Cook, James A. | Augusta, KS 67010 | Oil Operator | Jul 1997 |
| 2184 | Cook, Kenneth D. Operator | Midland, TX 79707 | Oil Operator | Apr 2025 |
| 2185 | Cook, Lee J. | Penn Yan, NY 14527 | Gas Operator | Dec 2023 |
| 2186 | Cooke & Montague Oper. Co., Inc. | Flower Mound, TX 75028 | Oil & Gas Operator | Apr 2025 |
| 2187 | Cooke County Production Company | Shawnee, OK 74801-1800 | Oil & Gas Operator | Jan 2022 |
| 2188 | Cooke Energy Company | San Antonio, TX 78250 | Oil & Gas Operator | Jul 2012 |
| 2189 | Cooke, Donald E./Lee Wanda | Coffeyville, KS 67331 | Oil Operator | Dec 2001 |
| 2190 | Cooke, Kenny D. Operating | Ballinger, TX 76821 | Oil & Gas Operator | Mar 2004 |
| 2191 | Cool Spring Colony, Inc. | Rudyard, MT 59540 | Gas Operator | Jan 2025 |
| 2192 | Coolidge, G. B., Inc. | Shelby, MT 59474 | Oil & Gas Operator | Aug 2016 |
| 2193 | Coolidge, Paul | | Oil Operator | Oct 2024 |
| 2194 | Coolidge, Timothy J & Billiette Nebel | Kevin, MT 59454 | Oil Operator | Oct 2024 |
| 2195 | Coolspring Gas & Oil Co LLC | Coolspring, PA 15730-8524 | Gas Operator | Dec 2024 |
| 2196 | Coomer, Mitchell | Columbia, KY 42728 | Oil Operator | Dec 2023 |
| 2197 | Coon Creek Gas Inc | | Oil & Gas Operator | Mar 2014 |
| 2198 | Coon Creek Transmission LLC | Barnsdall, OK 74002 | Oil & Gas Operator | May 2018 |
| 2199 | Coop Energy, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Apr 2025 |
| 2200 | Cooper & Brain Inc. | | Oil & Gas Operator | Dec 2024 |