| 2201 | Cornerstone Gas Processing Inc | | Oil Operator | Jan 1999 |
| 2202 | Cornerstone Minerals LTD | | Oil & Gas Operator | Dec 2009 |
| 2203 | Cornerstone Natural Gas Co. | | Oil Operator | Oct 1999 |
| 2204 | Cornerstone Natural Resources LLC | Denver, CO 80234 | Oil & Gas Operator | Apr 2026 |
| 2205 | Cornerstone Oil Trust | San Antonio, TX 78251 | Oil & Gas Operator | Jul 2003 |
| 2206 | Cornie Creek Corporation | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 2207 | Corning Oil Co Inc | Sonora, OH 43785 | Oil & Gas Operator | Dec 2002 |
| 2208 | Cornwell Well Service, Inc. | | Oil & Gas Operator | Feb 2010 |
| 2209 | Cornwell, G. G. | | Oil & Gas Operator | Sep 2009 |
| 2210 | Corona Development Co. Inc. | | Oil Operator | Dec 1989 |
| 2211 | Corona Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 2212 | Corona Operating, LLC | Midland, TX 79702 | Oil Operator | Jun 2026 |
| 2213 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 2214 | Coronado Energy Partners LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2026 |
| 2215 | Coronado Great Plains LLC | Tulsa, OK 74137-2832 | Gas Operator | Apr 2013 |
| 2216 | Coronado Kansas, LLC | Tulsa, OK 74133 | Oil Operator | Oct 2009 |
| 2217 | Coronado Minerals, LLC | Houston, TX 77208 | Oil & Gas Operator | Jun 2026 |
| 2218 | Coronado Oil | Lindsborg, KS 67456 | Oil Operator | Sep 1985 |
| 2219 | Coronado Oil & G | | Oil Operator | Dec 1996 |
| 2220 | Coronado Oil & Gas, Inc. | Great Bend, KS 67530 | Oil Operator | Jul 2004 |
| 2221 | Coronado Oil & Minerals Co. | | Oil & Gas Operator | Sep 1980 |
| 2222 | Coronado Oil Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 2223 | Coronado Oil, Inc. | Salina, KS 67401 | Oil Operator | May 1990 |
| 2224 | Coronado Oklahoma LLC | Tulsa, OK 74133-7036 | Gas Operator | Apr 2020 |
| 2225 | Coronado Petroleum Corporation | Oklahoma City, OK 73102-4803 | Oil & Gas Operator | Feb 2026 |
| 2226 | Corpening, Joe F. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2013 |
| 2227 | Corpus Christi Leaseholds, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Sep 1996 |
| 2228 | Corpus Christi Oil & Gas Co. | | Oil & Gas Operator | Dec 1991 |
| 2229 | Correll, Spencer | Perryton, TX 79070 | Oil & Gas Operator | Jun 2026 |
| 2230 | Corrida Oil Inc | Denver, CO 80217 | Oil & Gas Operator | Jun 1990 |
| 2231 | Corriente Operating Company LLC | Taft, TX 78390 | Oil & Gas Operator | Jun 2026 |
| 2232 | Corsa Resources, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 2233 | Corsair Energy, LC | Wichita, KS 67202 | Oil & Gas Operator | Apr 2004 |
| 2234 | Corsicana Crude Company, LLC | Denver, CO 80202 | Oil Operator | Jun 2026 |
| 2235 | Corsicana Crude Holdings, LLC | Denver, CO 80202 | Oil Operator | Jun 2026 |
| 2236 | Corsicana Field Fund | Corsicana, TX 75110 | Oil & Gas Operator | Dec 1993 |
| 2237 | Corsicana Oil & Gas | Corsicana, TX 75151 | Oil Operator | Jun 2026 |
| 2238 | Cortam, Inc. | Augusta, KS 67010 | Oil Operator | Dec 2024 |
| 2239 | Corterra Energy Operating LLC | Tulsa, OK 74119-4844 | Oil & Gas Operator | Aug 2021 |
| 2240 | Cortex Energy, Inc. | Wichita, KS 67217 | Oil & Gas Operator | Dec 2024 |
| 2241 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 2242 | Cortland Energy Co Inc | Worthington, OH 43085 | Oil & Gas Operator | Dec 2024 |
| 2243 | Corum Production Co.-Tepco | | Oil & Gas Operator | Dec 1989 |
| 2244 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 2245 | Corvette Oil Corporation | Fort Worth, TX 76115 | Oil & Gas Operator | Mar 2008 |
| 2246 | Corwin B V | Enid, OK 73701 | Oil & Gas Operator | Apr 2017 |
| 2247 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 2248 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Jun 2026 |
| 2249 | Coseka Resources USA LTD | Denver, CO 80202-1602 | Oil & Gas Operator | Jun 1988 |
| 2250 | Cosgriff Joe | Detroit, MI 48208 | Oil & Gas Operator | Dec 1998 |
| 2251 | Coshocton Pipe Co | Columbus, OH 43229 | Oil & Gas Operator | Dec 1989 |
| 2252 | Cosper Well/H Cosper | Logan, OH 43138 | Oil & Gas Operator | Dec 1996 |
| 2253 | Costa Energy, LLC | Irving, TX 75063 | Oil & Gas Operator | Jun 2026 |
| 2254 | Costa Loma LTD. | | Oil & Gas Operator | Dec 2025 |
| 2255 | Costa Resources, Inc. | Dallas, TX 75209 | Oil & Gas Operator | Aug 2003 |
| 2256 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 2257 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 2258 | Coteau Energy LLC | | Oil & Gas Operator | Dec 2024 |
| 2259 | Coterra Energy Inc | Coraopolis, PA 15108-9862 | Oil & Gas Operator | Mar 2026 |
| 2260 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Jun 2026 |
| 2261 | Coterra Energy Operating E LLC | Midland, TX 79706 | Oil & Gas Operator | Jan 2026 |
| 2262 | Coterra Energy Operating F LLC | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 2263 | Coterra Energy Operating M LLC | Midland, TX 79706 | Oil & Gas Operator | Aug 2019 |
| 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 | Jun 2026 |
| 2270 | Cotton Valley Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2025 |
| 2271 | Cotton Well Drilling Co Inc | Sheridan, NY 14135 | Oil & Gas Operator | Dec 2024 |
| 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 | Tulsa, OK 74103-3522 | Oil Operator | Jan 2026 |
| 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 | | 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 | Cotula Oil & Gas Co., Inc. | Cross Plains, TX 76443 | Oil Operator | Jun 2026 |
| 2282 | Couch Donald W | Marlow, OK 73055 | Oil & Gas Operator | Mar 2026 |
| 2283 | Couch Fred J | Broken Arrow, OK 74012 | Oil Operator | Mar 2010 |
| 2284 | Couch Oil & Gas, Inc. | Dallas, TX 75229 | Oil & Gas Operator | Jun 2026 |
| 2285 | Couch, Gilbert | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2026 |
| 2286 | Couch, Harry L. | Odessa, TX 79762 | Oil & Gas Operator | Nov 1994 |
| 2287 | Cougar Energies, Inc. | Oberlin, KS 67749 | Oil Operator | Jun 1996 |
| 2288 | Cougar Energy Inc | Oil City, PA 16301-4046 | Oil & Gas Operator | Dec 2013 |
| 2289 | Cougar Energy Investment LLC | Spring, TX 77387-7277 | Oil & Gas Operator | Sep 2014 |
| 2290 | Cougar Exploration, Inc. | | Oil & Gas Operator | Jun 1988 |
| 2291 | Cougar Oil | | Oil Operator | Jan 2026 |
| 2292 | Cougar Oil & Gas Co., Inc. | Houston, TX 77269 | Oil & Gas Operator | Mar 2008 |
| 2293 | Cougar Oil, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Jun 2009 |
| 2294 | Coughlin, Daniel L | | Oil Operator | Aug 2000 |
| 2295 | Coulthurst MGT & Inv Inc | Reno, NV 89504 | Oil Operator | Sep 2020 |
| 2296 | Council Oak Resources LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Dec 2025 |
| 2297 | Country Boy Oil Co Inc | | Oil Operator | Nov 2017 |
| 2298 | Country Side Sand & Gravel, Inc | Collins, NY 14034 | Gas Operator | Dec 2024 |
| 2299 | Countrymark Energy Resources L L C | MT Vernon, IN 47620 | Oil & Gas Operator | Dec 2024 |
| 2300 | County Line Resources LLC | Lancaster, TX 75146 | Oil Operator | Jun 2026 |