| 2101 | Cooke & Montague Oper. Co., Inc. | Flower Mound, TX 75028 | Oil & Gas Operator | Jun 2026 |
| 2102 | Cooke County Production Company | Shawnee, OK 74801-1800 | Oil & Gas Operator | Jan 2022 |
| 2103 | Cooke Energy Company | San Antonio, TX 78250 | Oil & Gas Operator | Jul 2012 |
| 2104 | Cooke, Donald E./Lee Wanda | Coffeyville, KS 67331 | Oil Operator | Dec 2001 |
| 2105 | Cooke, Kenny D. Operating | Ballinger, TX 76821 | Oil & Gas Operator | Mar 2004 |
| 2106 | Coolidge, G. B., Inc. | Shelby, MT 59474 | Oil & Gas Operator | Aug 2016 |
| 2107 | Coolidge, Paul | | Oil Operator | Dec 2025 |
| 2108 | Coolidge, Timothy J & Billiette Nebel | Kevin, MT 59454 | Oil Operator | Dec 2025 |
| 2109 | Coolspring Gas & Oil Co LLC | Coolspring, PA 15730-8524 | Gas Operator | Dec 2025 |
| 2110 | Coomer, Mitchell | Columbia, KY 42728 | Oil Operator | Dec 2024 |
| 2111 | Coon Creek Gas Inc | | Oil & Gas Operator | Mar 2014 |
| 2112 | Coop Energy, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jun 2026 |
| 2113 | Cooper & Brain Inc. | | Oil & Gas Operator | Mar 2026 |
| 2114 | Cooper A L & Mae C | | Oil & Gas Operator | Jan 2001 |
| 2115 | Cooper Energy Corp | | Oil & Gas Operator | Jun 1995 |
| 2116 | Cooper John T | Duncan, OK 73534 | Oil & Gas Operator | Sep 2014 |
| 2117 | Cooper Lisa L | Cushing, OK 74023 | Oil & Gas Operator | Mar 2015 |
| 2118 | Cooper Mineral Group Inc | Bellaire, TX 77401 | Oil & Gas Operator | Feb 2004 |
| 2119 | Cooper Oil & Gas, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2010 |
| 2120 | Cooper Oil & Gas, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jun 2026 |
| 2121 | Cooper Oil Company | Andover, KS 67002 | Oil Operator | Oct 1997 |
| 2122 | Cooper Oil Inc | Duncan, OK 73534 | Oil & Gas Operator | Sep 2014 |
| 2123 | Cooper Operating | Olney, TX 76374 | Oil Operator | Apr 2007 |
| 2124 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2026 |
| 2125 | Cooper Production Company | New Braunfels, TX 78132 | Oil & Gas Operator | Sep 2021 |
| 2126 | Cooper Service Co. | | Oil & Gas Operator | Sep 2025 |
| 2127 | Cooper, Glenn W. Oil & Gas | Seymour, TX 76380 | Oil & Gas Operator | Feb 2000 |
| 2128 | Cooper, J. M. | Winfield, KS 67119 | Oil Operator | Oct 1997 |
| 2129 | Cooper, Lowell E. | Peabody, KS 66866 | Oil Operator | Nov 1987 |
| 2130 | Coors Energy | Golden, CO 80402-0467 | Oil & Gas Operator | Sep 1992 |
| 2131 | Coots, Jesse | Le Roy, NY 14482 | Gas Operator | Dec 2024 |
| 2132 | Copano Company | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 2133 | Copano Gas Unit | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 2134 | Cope Oil Company | Valley VIew, TX 76272 | Oil & Gas Operator | Feb 2015 |
| 2135 | Copeland Gas LLC | Albion, PA 16401 | Gas Operator | Dec 2025 |
| 2136 | Copestone Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 2137 | Copper Land Resources LLC | | Oil Operator | Feb 2026 |
| 2138 | Copper Ridge Oil Inc | Olean, NY 14760 | Oil & Gas Operator | Dec 2024 |
| 2139 | Copper Ridge Resources LLC | Midland, TX 79710 | Oil Operator | Feb 2025 |
| 2140 | Copperhead Creek Enterprises, Inc. | Chautauqua, KS 67334 | Oil Operator | Sep 2019 |
| 2141 | Copperhead Enterprises LLC | | Oil & Gas Operator | Dec 2025 |
| 2142 | Copperhead Oil | Colony, KS 66015 | Oil Operator | Sep 1985 |
| 2143 | Copperhead Oil & Gas, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2017 |
| 2144 | Coppertop | San Angelo, TX 76904 | Oil & Gas Operator | Jun 2026 |
| 2145 | Coppock Herb Energy | Fairview, OK 73737-1037 | Oil & Gas Operator | May 2018 |
| 2146 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 2147 | Coral Coast Petroleum, L.C. | Wichita, KS 67226 | Oil & Gas Operator | Nov 2019 |
| 2148 | Coral E&P, LLC | Adkins, TX 78101 | Oil & Gas Operator | Jun 2026 |
| 2149 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Feb 2026 |
| 2150 | Corbell Wayne L | Fort Worth, TX 76111-4615 | Oil & Gas Operator | Apr 2023 |
| 2151 | Corbell, W. D. | Dublin, TX 76446 | Oil & Gas Operator | Dec 2001 |
| 2152 | Corda Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2026 |
| 2153 | Cordele Development Corporation | San Antonio, TX 78205 | Oil & Gas Operator | Jun 2026 |
| 2154 | Cordero Energy Operating LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2020 |
| 2155 | Cordero Mining Co | Gillette, WY 82717 | Oil Operator | Nov 2009 |
| 2156 | Cordero Oil And Gas LLC | Gillette, WY 82716 | Oil Operator | Nov 2021 |
| 2157 | Cordex Petroleums, Inc. | | Oil & Gas Operator | Jun 1996 |
| 2158 | Cordillera Corporation | Denver, CO 80237 | Oil & Gas Operator | Feb 1996 |
| 2159 | Cordillera Energy Partners II LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Feb 2026 |
| 2160 | Cordillera Energy Partners III LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Mar 2014 |
| 2161 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 2162 | Cordillera Energy PRTNRS III,LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2012 |
| 2163 | Cordillera Texas, L.P. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Sep 2008 |
| 2164 | Core Antrim Company LLC | | Gas Operator | Mar 2026 |
| 2165 | Core Appalachia Operating LLC | Charleston, WV 25362 | Oil & Gas Operator | Dec 2024 |
| 2166 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Jun 2026 |
| 2167 | Core Energy LLC | | Oil & Gas Operator | Mar 2026 |
| 2168 | Core Minerals Operating Co Inc | | Oil & Gas Operator | Dec 2024 |
| 2169 | Core Petro, LLC | Abilene, TX 79608 | Oil & Gas Operator | Jun 2026 |
| 2170 | Core Solutions LLC | | Oil & Gas Operator | Dec 2021 |
| 2171 | Corenergy Operating Group, LLC | Houston, TX 77074 | Oil & Gas Operator | Jun 2026 |
| 2172 | Coreterra Operating, LLC | Pampa, TX 79065 | Oil & Gas Operator | Jun 2026 |
| 2173 | Corfu Darien Properties, LLC | Corfu, NY 14036 | Gas Operator | Dec 2024 |
| 2174 | Corie Oil Co., Inc. | Russell, KS 67665 | Oil Operator | Feb 2003 |
| 2175 | Corie Oil Compan | | Oil Operator | Jul 1985 |
| 2176 | Corinne Grace | Carlsbad, NM 88220 | Oil & Gas Operator | Jan 2011 |
| 2177 | Corinthian Exploration (USA) Corp | | Oil & Gas Operator | Apr 2016 |
| 2178 | Cork Petroleum Corporation | Thermopolis, WY 82443 | Oil & Gas Operator | Apr 2012 |
| 2179 | Corkran Energy, LP | Ignacio, CO 81137 | Oil & Gas Operator | May 2013 |
| 2180 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Jun 2026 |
| 2181 | Corley G R | | Oil & Gas Operator | Jun 2009 |
| 2182 | Corley Production Company | Wilson, OK 73463-7218 | Oil Operator | Mar 2026 |
| 2183 | Corley Production Inc | Comanche, OK 73529-4668 | Oil Operator | Mar 2015 |
| 2184 | Corley, Henry Oil Properties LLC | El Dorado, AR 71730 | Oil Operator | Jan 2025 |
| 2185 | Corman, Jack | Dallas, TX 75231 | Oil & Gas Operator | May 2022 |
| 2186 | Cornelius Dale | Willow, OK 73673 | Oil Operator | Feb 2026 |
| 2187 | Cornelius Oil Company | Kellyville, OK 74039-0459 | Oil & Gas Operator | Jul 2015 |
| 2188 | Cornelius Oil Inc | Kellyville, OK 74039 | Oil & Gas Operator | Feb 2026 |
| 2189 | Cornelius Petroleum Inc | | Oil & Gas Operator | Feb 2026 |
| 2190 | Cornelius Phillip J & Connie | Kellyville, OK 74039 | Oil & Gas Operator | Dec 2000 |
| 2191 | Cornelius Tony | Sapulpa, OK 74066-5845 | Oil & Gas Operator | Feb 2026 |
| 2192 | Cornelius, Steven L | | Oil Operator | Sep 2015 |
| 2193 | Cornell Glen R | Pauls Valley, OK 73075-9606 | Oil & Gas Operator | Oct 2013 |
| 2194 | Cornell Oil Company | | Oil & Gas Operator | May 1985 |
| 2195 | Cornell Rich M - | | Oil & Gas Operator | May 1993 |
| 2196 | Corner Energy LLC | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Mar 2015 |
| 2197 | Corner Operating Company, Inc | New York, NY 10165 | Oil & Gas Operator | Dec 1999 |
| 2198 | Cornerstone E & P Company LP | Irving, TX 75038 | Oil & Gas Operator | Nov 2010 |
| 2199 | Cornerstone Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Nov 2011 |
| 2200 | Cornerstone Energy, LLC | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |