| 2201 | Corner Energy LLC | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Mar 2015 |
| 2202 | Corner Operating Company, Inc | New York, NY 10165 | Oil & Gas Operator | Dec 1999 |
| 2203 | Cornerstone E & P Company LP | Irving, TX 75038 | Oil & Gas Operator | Nov 2010 |
| 2204 | Cornerstone Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Nov 2011 |
| 2205 | Cornerstone Energy, LLC | Magnolia, AR 71753 | Oil & Gas Operator | Feb 2024 |
| 2206 | Cornerstone Gas Processing Inc | | Oil Operator | Jan 1999 |
| 2207 | Cornerstone Natural Gas Co. | | Oil Operator | Oct 1999 |
| 2208 | Cornerstone Natural Resources LLC | Denver, CO 80234 | Oil & Gas Operator | Feb 2024 |
| 2209 | Cornerstone Oil Trust | San Antonio, TX 78251 | Oil & Gas Operator | Jul 2003 |
| 2210 | Cornie Creek Corporation | Magnolia, AR 71753 | Oil & Gas Operator | Feb 2024 |
| 2211 | Corning Oil Co Inc | Sonora, OH 43785 | Oil & Gas Operator | Dec 2002 |
| 2212 | Cornwell Well Service, Inc. | | Oil & Gas Operator | Feb 2010 |
| 2213 | Cornwell, G. G. | | Oil & Gas Operator | Sep 2009 |
| 2214 | Corona Development Co. Inc. | | Oil Operator | Dec 1989 |
| 2215 | Corona Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 2216 | Corona Operating, LLC | Midland, TX 79702 | Oil Operator | Apr 2024 |
| 2217 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 2218 | Coronado Great Plains LLC | Tulsa, OK 74137-2832 | Gas Operator | Apr 2013 |
| 2219 | Coronado Kansas, LLC | Tulsa, OK 74133 | Oil Operator | Oct 2009 |
| 2220 | Coronado Minerals, LLC | Houston, TX 77208 | Oil & Gas Operator | Apr 2024 |
| 2221 | Coronado Oil | Lindsborg, KS 67456 | Oil Operator | Sep 1985 |
| 2222 | Coronado Oil & G | | Oil Operator | Dec 1996 |
| 2223 | Coronado Oil & Gas, Inc. | Great Bend, KS 67530 | Oil Operator | Jul 2004 |
| 2224 | Coronado Oil & Minerals Co. | | Oil & Gas Operator | Sep 1980 |
| 2225 | Coronado Oil Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 2226 | Coronado Oil, Inc. | Salina, KS 67401 | Oil Operator | May 1990 |
| 2227 | Coronado Oklahoma LLC | Tulsa, OK 74133-7036 | Gas Operator | Apr 2020 |
| 2228 | Coronado Petroleum Corporation | Oklahoma City, OK 73102-4803 | Oil & Gas Operator | Jan 2024 |
| 2229 | Corpening, Joe F. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2013 |
| 2230 | Corpus Christi Leaseholds, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Sep 1996 |
| 2231 | Corpus Christi Oil & Gas Co. | | Oil & Gas Operator | Dec 1991 |
| 2232 | Correll, Spencer | Perryton, TX 79070 | Oil & Gas Operator | Apr 2024 |
| 2233 | Corrida Oil Inc | Denver, CO 80217 | Oil & Gas Operator | Jun 1990 |
| 2234 | Corriente Operating Company LLC | Taft, TX 78390 | Oil & Gas Operator | Apr 2024 |
| 2235 | Corsa Resources, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 2236 | Corsair Energy, LC | Wichita, KS 67202 | Oil & Gas Operator | Apr 2004 |
| 2237 | Corsicana Crude Company, LLC | Denver, CO 80202 | Oil Operator | Apr 2024 |
| 2238 | Corsicana Crude Holdings, LLC | Denver, CO 80202 | Oil Operator | Apr 2024 |
| 2239 | Corsicana Field Fund | Corsicana, TX 75110 | Oil & Gas Operator | Dec 1993 |
| 2240 | Corsicana Oil & Gas | Corsicana, TX 75151 | Oil Operator | Apr 2024 |
| 2241 | Cortam, Inc. | Augusta, KS 67010 | Oil Operator | Dec 2023 |
| 2242 | Corterra Energy Operating LLC | | Oil & Gas Operator | Aug 2021 |
| 2243 | Cortex Energy, Inc. | Wichita, KS 67217 | Oil & Gas Operator | Dec 2023 |
| 2244 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 2245 | Cortland Energy Co Inc | Cortland, OH 44410 | Oil & Gas Operator | Dec 2023 |
| 2246 | Corum Operating Company, LLC | Houston, TX 77055 | Oil & Gas Operator | Apr 2024 |
| 2247 | Corum Production Co.-Tepco | | Oil & Gas Operator | Dec 1989 |
| 2248 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 2249 | Corvette Oil Corporation | Fort Worth, TX 76115 | Oil & Gas Operator | Mar 2008 |
| 2250 | Corvin Craig | Jenks, OK 74037-0516 | Oil Operator | Feb 2012 |
| 2251 | Corwin, B. V. | Enid, OK 73701 | Oil & Gas Operator | Apr 2017 |
| 2252 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 2253 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Apr 2024 |
| 2254 | Coseka Resources USA LTD | Denver, CO 80202-1602 | Oil & Gas Operator | Jun 1988 |
| 2255 | Cosgriff Joe | Detroit, MI 48208 | Oil & Gas Operator | Dec 1998 |
| 2256 | Coshocton Pipe Co | Columbus, OH 43229 | Oil & Gas Operator | Dec 1989 |
| 2257 | Costa Energy, LLC | Irving, TX 75063 | Oil & Gas Operator | Apr 2024 |
| 2258 | Costa Loma LTD. | | Oil & Gas Operator | Nov 2023 |
| 2259 | Costa Resources, Inc. | Dallas, TX 75209 | Oil & Gas Operator | Aug 2003 |
| 2260 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 2261 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 2262 | Coteau Energy LLC | | Oil & Gas Operator | Dec 2023 |
| 2263 | Coterra Energy Inc | Pittsburgh, PA 15275-1121 | Oil & Gas Operator | Feb 2024 |
| 2264 | Cotiga Development Company, Limited Partnership | Williamson, WV 25661-0000 | Oil & Gas Operator | Dec 2021 |
| 2265 | Cotton County Ventures | Estes Park, CO 80517 | Oil Operator | Nov 2003 |
| 2266 | Cotton Petroleum Corp/Apc | Denver, CO 80203-4549 | Oil & Gas Operator | Nov 1990 |
| 2267 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 2268 | Cotton Valley Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2000 |
| 2269 | Cotton Valley Operations, Inc. | Longview, TX 75608 | Oil & Gas Operator | Apr 2024 |
| 2270 | Cotton Valley Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 2271 | Cotton Well Drilling Co Inc | Sheridan, NY 14135 | Oil & Gas Operator | Dec 2022 |
| 2272 | Cotton, W. L. | Hebbronville, TX 78361 | Oil & Gas Operator | Mar 1996 |
| 2273 | Cotton, W.L. Gems & Minerals LTD | Hebbronville, TX 78361 | Oil & Gas Operator | May 2000 |
| 2274 | Cottonmouth SWD LLC | | Oil Operator | Feb 2024 |
| 2275 | Cottonwood Oil C | | Oil & Gas Operator | Oct 1988 |
| 2276 | Cottonwood Oil Inc | Worland, WY 82401 | Oil & Gas Operator | Jun 1988 |
| 2277 | Cottonwood Opr Corp | Dubois, PA 15801-0403 | Gas Operator | Dec 1989 |
| 2278 | Cottonwood Petroleum Co. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2009 |
| 2279 | Cottonwood Prod Co Inc | Buffalo, NY 14202-2212 | Gas Operator | Dec 2002 |
| 2280 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 2281 | Couch Donald W | Marlow, OK 73055-5252 | Oil & Gas Operator | Feb 2024 |
| 2282 | Couch Fred J | Broken Arrow, OK 74012 | Oil Operator | Mar 2010 |
| 2283 | Couch Oil & Gas, Inc. | Dallas, TX 75229 | Oil & Gas Operator | Apr 2024 |
| 2284 | Couch, Gilbert | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 2285 | Couch, Harry L. | Odessa, TX 79762 | Oil & Gas Operator | Nov 1994 |
| 2286 | Cougar Energies, Inc. | Oberlin, KS 67749 | Oil Operator | Jun 1996 |
| 2287 | Cougar Energy Inc | Oil City, PA 16301-4046 | Oil & Gas Operator | Dec 2013 |
| 2288 | Cougar Energy Investment LLC | Spring, TX 77387-7277 | Oil & Gas Operator | Sep 2014 |
| 2289 | Cougar Exploration, Inc. | | Oil & Gas Operator | Jun 1988 |
| 2290 | Cougar Oil & Gas Co., Inc. | Houston, TX 77269 | Oil & Gas Operator | Mar 2008 |
| 2291 | Cougar Oil, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Jun 2009 |
| 2292 | Coughlin Daniel | El Reno, OK 73036 | Oil Operator | Aug 2000 |
| 2293 | Coulthurst MGT & Inv Inc | Reno, NV 89504 | Oil Operator | Sep 2020 |
| 2294 | Council Oak Resources LLC | | Oil & Gas Operator | Jan 2024 |
| 2295 | Country Boy Oil Co Inc | | Oil Operator | Nov 2017 |
| 2296 | Country Side Sand & Gravel, Inc | Collins, NY 14034 | Gas Operator | Dec 2022 |
| 2297 | Countrymark Energy Resources, LLC | MT Vernon, IN 47620 | Oil & Gas Operator | Dec 2022 |
| 2298 | County Line Stone Co., Inc. | Akron, NY 14001 | Gas Operator | Dec 2022 |
| 2299 | County Line Stripper Wells LLC | | Oil & Gas Operator | Sep 2023 |
| 2300 | County Management, Inc. | Houston, TX 77055 | Oil & Gas Operator | Apr 1993 |