| 5201 | Centurion Oil Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | May 1992 |
| 5202 | Centurion Oilfield Services LLC | Burneyville, OK 73430 | Oil & Gas Operator | Jan 2026 |
| 5203 | Centurion Operating Corporation | Rockwall, TX 75087 | Oil & Gas Operator | May 2026 |
| 5204 | Centurion Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 5205 | Century Assets Corporation | Houston, TX 77056 | Oil Operator | May 2026 |
| 5206 | Century Energy | Gillette, WY 82717 | Oil & Gas Operator | Dec 1996 |
| 5207 | Century Energy, Inc. | | Oil & Gas Operator | Aug 1989 |
| 5208 | Century Exploration Company | | Oil & Gas Operator | Dec 2003 |
| 5209 | Century Exploration Houston, Inc | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2011 |
| 5210 | Century Exploration Houston, LLC | Austin, TX 78702 | Oil & Gas Operator | Jan 2016 |
| 5211 | Century Exploration N.O. LLC | | Oil & Gas Operator | Jun 2017 |
| 5212 | Century Exploration N.O., Inc. | | Oil & Gas Operator | Sep 2011 |
| 5213 | Century Exploration New Orleans, LLC | | Oil & Gas Operator | Mar 2008 |
| 5214 | Century Exploration Resources LLC | | Oil & Gas Operator | Dec 2015 |
| 5215 | Century Mineral Corporation | | Oil & Gas Operator | Dec 1990 |
| 5216 | Century Mining, LLC | | Gas Operator | Dec 2021 |
| 5217 | Century Offshore MGMT. Corp. | | Oil & Gas Operator | Dec 1999 |
| 5218 | Century Oil & Gas Corporation | | Oil & Gas Operator | Dec 1987 |
| 5219 | Century Oil And Gas LLC | Katy, TX 77494 | Oil & Gas Operator | Feb 2026 |
| 5220 | Century Oil Company Inc | | Oil Operator | Dec 2025 |
| 5221 | Century Oil Mana | | Oil Operator | Apr 1987 |
| 5222 | Century Oil, Inc. | | Oil Operator | Apr 2022 |
| 5223 | Century Petroleum | Nowata, OK 74048 | Oil & Gas Operator | Dec 2000 |
| 5224 | Century Petroleum, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | May 2026 |
| 5225 | Century Production Inc | | Oil & Gas Operator | Dec 1986 |
| 5226 | Century Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | May 2026 |
| 5227 | Century Royalty 2000 GP, LLC | Conroe, TX 77301 | Oil & Gas Operator | Jun 2020 |
| 5228 | Century Stimulation & Eng LLC | | Oil Operator | Dec 2015 |
| 5229 | Century Well Service | Cumberland, WV 26047 | Oil & Gas Operator | Dec 2006 |
| 5230 | Ceo Operating, Co. | | Oil & Gas Operator | Dec 1999 |
| 5231 | Cep Mid-Continent LLC | Skiatook, OK 74070 | Oil & Gas Operator | Feb 2026 |
| 5232 | Cerberus Engineering, LLC | San Antonio, TX 78209 | Oil & Gas Operator | May 2026 |
| 5233 | Cerne, Christine | Eden, NY 14057 | Gas Operator | Dec 2024 |
| 5234 | Cerro Oil Co., Inc. | | Oil Operator | Dec 1987 |
| 5235 | Certified Petroleum Inc. | Mineral Wells, TX 76067 | Oil & Gas Operator | May 2006 |
| 5236 | Cesinger Exploration Service, In | Dallas, TX 75208 | Oil & Gas Operator | Mar 2006 |
| 5237 | Cet Energy Corporation | Spring, TX 77391 | Oil & Gas Operator | Nov 2003 |
| 5238 | Cex Operating Company | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 5239 | CFC Oil Inc | Cyril, OK 73029-5601 | Oil & Gas Operator | Dec 2025 |
| 5240 | CFM 66 LLC | McPherson, KS 67460 | Oil & Gas Operator | Sep 2025 |
| 5241 | CFM Oil, LLC | Artesia, NM 88210 | Oil & Gas Operator | Feb 2026 |
| 5242 | Cfo Resources, Inc. | Corpus Christ, TX 78412 | Oil & Gas Operator | May 2026 |
| 5243 | CFT Oil & Gas LLC | | Oil Operator | Mar 2026 |
| 5244 | CG Oil Co. | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2011 |
| 5245 | CG Technical Operating Co, LLC | Stamford, TX 79553 | Oil Operator | May 2026 |
| 5246 | CG&G Oil LLC | New Matamoras, OH 45767 | Oil & Gas Operator | Dec 2021 |
| 5247 | Cgas Expl Inc | Columbus, OH 43214-1862 | Oil & Gas Operator | Dec 2006 |
| 5248 | Cgas Exploration | Charleston, WV 25301 | Oil & Gas Operator | Dec 2006 |
| 5249 | CGS Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2023 |
| 5250 | CH-Seon Inc. | Dallas, TX 75251 | Oil & Gas Operator | May 2026 |
| 5251 | CH4 Energy II LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Feb 2026 |
| 5252 | CH4 Energy LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2006 |
| 5253 | CH4 Energy Six, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | May 2026 |
| 5254 | CH4 Production Company Inc | Tulsa, OK 74170-1955 | Gas Operator | May 2007 |
| 5255 | Chace Oil Co Inc | Dallas, TX 75229 | Oil & Gas Operator | Mar 2006 |
| 5256 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Feb 2026 |
| 5257 | Chadco, Inc. | | Oil Operator | Dec 2024 |
| 5258 | Chaim Nathan & Edie Bato | | Oil & Gas Operator | Feb 2026 |
| 5259 | Chain Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | May 2026 |
| 5260 | Chalice Petroleum Corporation | Dallas, TX 75202 | Oil & Gas Operator | May 1998 |
| 5261 | Chalk, Otis, Estate | Big Spring, TX 79721 | Oil & Gas Operator | Jan 2006 |
| 5262 | Chalker Energy Management II,LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2008 |
| 5263 | Chalker Energy Management,LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2006 |
| 5264 | Chalker Operating Inc. | Richmond, TX 77406 | Oil & Gas Operator | Jul 2016 |
| 5265 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 5266 | Challenger Energy SVCS Co., LLC | Kilgore, TX 75663 | Oil Operator | May 2026 |
| 5267 | Challenger Exploration | | Oil Operator | Nov 2014 |
| 5268 | Challenger Minerals Inc. | | Oil & Gas Operator | Dec 1991 |
| 5269 | Challenger Point Energy, LLC | | Oil & Gas Operator | Feb 2026 |
| 5270 | Chalmers Exploration Company | Abilene, TX 79608 | Oil & Gas Operator | Apr 1997 |
| 5271 | Chalmers-Santa Fe LLC | | Oil & Gas Operator | Dec 2007 |
| 5272 | Chama Resources | Dallas, TX 75354 | Oil & Gas Operator | Apr 2009 |
| 5273 | Chamberlain Dba/Old South Oil | Marietta, OH 45750 | Oil & Gas Operator | Dec 2008 |
| 5274 | Chambers & Hendrix Oil & Gas | Skiatook, OK 74070-0726 | Oil & Gas Operator | Aug 2022 |
| 5275 | Chambers & Mouren | | Oil & Gas Operator | Mar 2026 |
| 5276 | Chambers Exploration Inc. | | Oil & Gas Operator | Dec 1986 |
| 5277 | Chambers Jerry | Denver, CO 80237 | Oil & Gas Operator | Dec 1993 |
| 5278 | Chambers Jerry Expl Co | | Oil & Gas Operator | Sep 2000 |
| 5279 | Chambers Operating, Inc. | Westbrook, TX 79565 | Oil & Gas Operator | Mar 2006 |
| 5280 | Chambers, R. H. | Abilene, TX 79606 | Oil & Gas Operator | Apr 2006 |
| 5281 | Chambers, R. H. LLC | Abilene, TX 79606 | Oil & Gas Operator | Dec 2025 |
| 5282 | Champ Oil Company | Hickory Creek, TX 75065 | Oil & Gas Operator | Dec 2020 |
| 5283 | Champ Operating Company | Dallas, TX 75208 | Oil & Gas Operator | Oct 2020 |
| 5284 | Champion Lone Star Operating,LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2020 |
| 5285 | Champion Petrole | | Oil Operator | Jan 1992 |
| 5286 | Champion Reserves-Cri Inc | Oklahoma City, OK 73123 | Oil & Gas Operator | Jun 1994 |
| 5287 | Champion-Park Gas Corporation | Warren, OH 44483 | Oil & Gas Operator | Dec 2023 |
| 5288 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Feb 2026 |
| 5289 | Champlin Petroleum Co. | Rock Springs, WY 82902 | Oil & Gas Operator | Mar 1991 |
| 5290 | Champlin SR., Bryan | Kennedy, NY 14747 | Gas Operator | Dec 2024 |
| 5291 | Chan West Oil Corporation | Irving, TX 75016 | Oil & Gas Operator | May 2026 |
| 5292 | Chanc West, Inc. | Iraan, TX 79744 | Oil & Gas Operator | Mar 1995 |
| 5293 | Chance Drilling Company | Commerce City, CO 80022 | Oil Operator | Sep 2009 |
| 5294 | Chance Energy Co. Inc. | Amarillo, TX 79114 | Oil & Gas Operator | Sep 1999 |
| 5295 | Chance Oil Co., Inc. | Vernon, TX 76385 | Oil & Gas Operator | Feb 2026 |
| 5296 | Chance Properties Co. | Kermit, TX 79745 | Oil & Gas Operator | May 2026 |
| 5297 | Chancellor & Dolezal | | Gas Operator | Apr 1992 |
| 5298 | Chancellor, Earl Sales Co., Inc. | Sweetwater, TX 79556 | Oil & Gas Operator | May 2026 |
| 5299 | Chandler & Associated Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 1999 |
| 5300 | Chandler & Associates, Inc. | Denver, CO 80202 | Oil & Gas Operator | May 1997 |