| 2201 | Cook Exploration Co. | Longview, TX 75602 | Oil & Gas Operator | Feb 2026 |
| 2202 | Cook Inlet Energy, LLC. | | Oil & Gas Operator | Jan 2026 |
| 2203 | Cook L D | Bartlesville, OK 74005-2306 | Oil & Gas Operator | Nov 2005 |
| 2204 | Cook Marshall Operating, Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 1995 |
| 2205 | Cook Oil Company | Wewoka, OK 74884 | Oil & Gas Operator | Sep 2015 |
| 2206 | Cook Operating C | | Oil Operator | May 1987 |
| 2207 | Cook Production LLC | | Oil Operator | Jan 2025 |
| 2208 | Cook Robert L | Rockwall, TX 75087-0892 | Oil & Gas Operator | Mar 2015 |
| 2209 | Cook Vascular Inc | Leechburg, PA 15656-0529 | Gas Operator | Dec 2021 |
| 2210 | Cook W R Inc | Duncan, OK 73534-0069 | Oil & Gas Operator | Jun 2000 |
| 2211 | Cook William Glenn | Wewoka, OK 74884-0727 | Oil & Gas Operator | Nov 2000 |
| 2212 | Cook, James A. | Augusta, KS 67010 | Oil Operator | Jul 1997 |
| 2213 | Cook, Kenneth D. Operator | Midland, TX 79707 | Oil Operator | Feb 2026 |
| 2214 | Cook, Lee J. | Penn Yan, NY 14527 | Gas Operator | Dec 2024 |
| 2215 | Cooke & Montague Oper. Co., Inc. | Flower Mound, TX 75028 | Oil & Gas Operator | Feb 2026 |
| 2216 | Cooke County Production Company | Shawnee, OK 74801-1800 | Oil & Gas Operator | Jan 2022 |
| 2217 | Cooke Energy Company | San Antonio, TX 78250 | Oil & Gas Operator | Jul 2012 |
| 2218 | Cooke, Donald E./Lee Wanda | Coffeyville, KS 67331 | Oil Operator | Dec 2001 |
| 2219 | Cooke, Kenny D. Operating | Ballinger, TX 76821 | Oil & Gas Operator | Mar 2004 |
| 2220 | Coolidge, G. B., Inc. | Shelby, MT 59474 | Oil & Gas Operator | Aug 2016 |
| 2221 | Coolidge, Paul | | Oil Operator | Sep 2025 |
| 2222 | Coolidge, Timothy J & Billiette Nebel | Kevin, MT 59454 | Oil Operator | Sep 2025 |
| 2223 | Coolspring Gas & Oil Co LLC | Coolspring, PA 15730-8524 | Gas Operator | Dec 2025 |
| 2224 | Coomer, Mitchell | Columbia, KY 42728 | Oil Operator | Dec 2023 |
| 2225 | Coon Creek Gas Inc | | Oil & Gas Operator | Mar 2014 |
| 2226 | Coop Energy, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Feb 2026 |
| 2227 | Cooper & Brain Inc. | | Oil & Gas Operator | Dec 2025 |
| 2228 | Cooper A L & Mae C | | Oil & Gas Operator | Jan 2001 |
| 2229 | Cooper Energy Corp | | Oil & Gas Operator | Jun 1995 |
| 2230 | Cooper John T | Duncan, OK 73534 | Oil & Gas Operator | Sep 2014 |
| 2231 | Cooper Lisa L | Cushing, OK 74023 | Oil & Gas Operator | Mar 2015 |
| 2232 | Cooper Mineral Group Inc | Bellaire, TX 77401 | Oil & Gas Operator | Feb 2004 |
| 2233 | Cooper Oil & Gas, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2010 |
| 2234 | Cooper Oil & Gas, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 2235 | Cooper Oil Company | Andover, KS 67002 | Oil Operator | Oct 1997 |
| 2236 | Cooper Oil Inc | Duncan, OK 73534 | Oil & Gas Operator | Sep 2014 |
| 2237 | Cooper Operating | Olney, TX 76374 | Oil Operator | Apr 2007 |
| 2238 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Dec 2025 |
| 2239 | Cooper Production Company | New Braunfels, TX 78132 | Oil & Gas Operator | Sep 2021 |
| 2240 | Cooper Service Co. | | Oil & Gas Operator | Sep 2025 |
| 2241 | Cooper Six C Oil LLC | Ponder, TX 76259 | Oil & Gas Operator | Feb 2026 |
| 2242 | Cooper, Glenn W. Oil & Gas | Seymour, TX 76380 | Oil & Gas Operator | Feb 2000 |
| 2243 | Cooper, J. M. | Winfield, KS 67119 | Oil Operator | Oct 1997 |
| 2244 | Cooper, Lowell E. | Peabody, KS 66866 | Oil Operator | Nov 1987 |
| 2245 | Coors Energy | Golden, CO 80402-0467 | Oil & Gas Operator | Sep 1992 |
| 2246 | Coots, Jesse | Le Roy, NY 14482 | Gas Operator | Dec 2024 |
| 2247 | Copano Company | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 2248 | Copano Gas Unit | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 2249 | Cope Oil Company | Valley VIew, TX 76272 | Oil & Gas Operator | Feb 2015 |
| 2250 | Copeland Gas LLC | Albion, PA 16401 | Gas Operator | Dec 2025 |
| 2251 | Copestone Operating, LLC | Houston, TX 77019 | Oil & Gas Operator | Feb 2026 |
| 2252 | Copper Land Resources LLC | | Oil Operator | Nov 2025 |
| 2253 | Copper Ridge Oil Inc | Olean, NY 14760 | Oil & Gas Operator | Dec 2024 |
| 2254 | Copper Ridge Resources LLC | Midland, TX 79710 | Oil Operator | Feb 2025 |
| 2255 | Copperhead Creek Enterprises, Inc. | Chautauqua, KS 67334 | Oil Operator | Sep 2019 |
| 2256 | Copperhead Enterprises LLC | Ludlow, PA 16333-0057 | Oil & Gas Operator | Dec 2025 |
| 2257 | Copperhead Oil | Colony, KS 66015 | Oil Operator | Sep 1985 |
| 2258 | Copperhead Oil & Gas, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2017 |
| 2259 | Coppertop | San Angelo, TX 76904 | Oil & Gas Operator | Feb 2026 |
| 2260 | Coppock Herb Energy | Fairview, OK 73737-1037 | Oil & Gas Operator | May 2018 |
| 2261 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 2262 | Coral Coast Petroleum, L.C. | Wichita, KS 67226 | Oil & Gas Operator | Nov 2019 |
| 2263 | Coral E&P, LLC | Adkins, TX 78101 | Oil & Gas Operator | Feb 2026 |
| 2264 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Sep 2025 |
| 2265 | Corbell Wayne L | Fort Worth, TX 76111-4615 | Oil & Gas Operator | Apr 2023 |
| 2266 | Corbell, W. D. | Dublin, TX 76446 | Oil & Gas Operator | Dec 2001 |
| 2267 | Corda Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 2268 | Cordele Development Corporation | San Antonio, TX 78205 | Oil & Gas Operator | Feb 2026 |
| 2269 | Cordero Energy Operating LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2020 |
| 2270 | Cordero Mining Co | Gillette, WY 82717 | Oil Operator | Nov 2009 |
| 2271 | Cordero Oil And Gas LLC | Gillette, WY 82716 | Oil Operator | Nov 2021 |
| 2272 | Cordex Petroleums, Inc. | | Oil & Gas Operator | Jun 1996 |
| 2273 | Cordillera Corporation | Denver, CO 80237 | Oil & Gas Operator | Feb 1996 |
| 2274 | Cordillera Energy Partners II LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Nov 2025 |
| 2275 | Cordillera Energy Partners III LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Mar 2014 |
| 2276 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 2277 | Cordillera Energy PRTNRS III,LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2012 |
| 2278 | Cordillera Texas, L.P. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Sep 2008 |
| 2279 | Core Antrim Company LLC | | Gas Operator | Dec 2025 |
| 2280 | Core Appalachia Operating LLC | Charleston, WV 25362 | Oil & Gas Operator | Dec 2023 |
| 2281 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Feb 2026 |
| 2282 | Core Energy LLC | | Oil & Gas Operator | Dec 2025 |
| 2283 | Core Minerals Operating Co Inc | | Oil & Gas Operator | Dec 2023 |
| 2284 | Core Petro, LLC | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 2285 | Core Solutions LLC | | Oil & Gas Operator | Dec 2021 |
| 2286 | Corenergy Operating Group, LLC | Houston, TX 77074 | Oil & Gas Operator | Feb 2026 |
| 2287 | Coreterra Operating, LLC | Pampa, TX 79065 | Oil & Gas Operator | Feb 2026 |
| 2288 | Corfu Darien Properties, LLC | Corfu, NY 14036 | Gas Operator | Dec 2024 |
| 2289 | Corgray Energy, Inc. | Houston, TX 77254 | Gas Operator | Mar 2005 |
| 2290 | Corgray Holdings, LLC | Fulshear, TX 77441 | Gas Operator | Mar 2016 |
| 2291 | Corie Oil Co., Inc. | Russell, KS 67665 | Oil Operator | Feb 2003 |
| 2292 | Corie Oil Compan | | Oil Operator | Jul 1985 |
| 2293 | Corinne Grace | Carlsbad, NM 88220 | Oil & Gas Operator | Jan 2011 |
| 2294 | Corinthian Exploration (USA) Corp | | Oil & Gas Operator | Apr 2016 |
| 2295 | Cork Petroleum Corporation | Thermopolis, WY 82443 | Oil & Gas Operator | Apr 2012 |
| 2296 | Corkran Energy, LP | Ignacio, CO 81137 | Oil & Gas Operator | May 2013 |
| 2297 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Feb 2026 |
| 2298 | Corley G R | | Oil & Gas Operator | Jun 2009 |
| 2299 | Corley Production Company | Wilson, OK 73463-7218 | Oil Operator | Dec 2025 |
| 2300 | Corley Production Inc | Comanche, OK 73529-4668 | Oil Operator | Mar 2015 |