| 5201 | Catfish Oil | | Oil Operator | Aug 2025 |
| 5202 | Cather Rogers Barnes & Cree | | Oil & Gas Operator | Dec 2009 |
| 5203 | Cather, Barnes & Cree | | Oil & Gas Operator | Dec 2009 |
| 5204 | Cather-Herley Oil Company | | Oil & Gas Operator | Nov 2025 |
| 5205 | Cathexis Oil & Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2014 |
| 5206 | Cathey Oil, Inc. | | Oil & Gas Operator | Aug 2009 |
| 5207 | Cathey Petroleum Company, Inc. | Big Spring, TX 79720 | Oil & Gas Operator | Apr 2008 |
| 5208 | Cathey Production Company | Ryan, OK 73565-0485 | Oil Operator | Dec 2010 |
| 5209 | Caths Oil & Gas | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 5210 | Catlett & Ferguson-Carl O & G | | Oil & Gas Operator | Jun 1978 |
| 5211 | Catlin Drilling Company | Iowa Park, TX 76367 | Oil & Gas Operator | Aug 2003 |
| 5212 | Catlin, Carl | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2008 |
| 5213 | Catlin, Cecil | Iowa Park, TX 76367 | Oil & Gas Operator | Dec 1995 |
| 5214 | Catlin, Cecil, Oil Co. | Iowa Park, TX 76367 | Oil & Gas Operator | Jun 2000 |
| 5215 | Catlin, Delbert | Iowa Park, TX 76367 | Oil & Gas Operator | Feb 2026 |
| 5216 | Catlin, Randy | Iowa Park, TX 76367 | Oil Operator | Feb 2026 |
| 5217 | Catoilan Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 5218 | Catron Oil Co | | Oil Operator | Dec 2023 |
| 5219 | Catron Oil Div - | | Oil Operator | Aug 1989 |
| 5220 | Catron Oil Division | | Oil Operator | Feb 2000 |
| 5221 | Catt Drilling Co. | Holyrood, KS 67450 | Oil Operator | Aug 1989 |
| 5222 | Cattlemans Oil O | | Oil Operator | Nov 1995 |
| 5223 | Cattlemans Oil Operations | | Oil Operator | Dec 2009 |
| 5224 | Cattlemans Oil Operations LLC | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 5225 | Caturus Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 5226 | Caulkins Oil Company | Aztec, NM 87410 | Oil & Gas Operator | Oct 2024 |
| 5227 | Cavalcade Operating Company LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2017 |
| 5228 | Cavalier Oil & Gas, Inc. | Buchanan Dam, TX 78609 | Oil & Gas Operator | Feb 2026 |
| 5229 | Cavalier Oil Co. Et Al | | Oil Operator | Jan 1986 |
| 5230 | Cavalier Petroleum | Shelby, MT 59474 | Oil & Gas Operator | Oct 2014 |
| 5231 | Cavalry Resources LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2010 |
| 5232 | Cavendish Petro Of Oh Inc | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1989 |
| 5233 | Cavenham Energy Resources Inc. | | Oil & Gas Operator | Apr 1991 |
| 5234 | Cavenham Energy Resrces Inc JV | | Oil Operator | Mar 1991 |
| 5235 | Cavenham Forest Ind., Inc. | | Oil & Gas Operator | Nov 1987 |
| 5236 | Cavenham Forest Ind., Inc. J V | | Oil Operator | Nov 1987 |
| 5237 | Cavilla Energy, Inc. | Longview, TX 75606 | Oil Operator | Feb 2026 |
| 5238 | Cavillo Oil Company LC Of Texas | Marshall, TX 75671 | Oil & Gas Operator | Feb 2026 |
| 5239 | Cavillo Oil Corporation | Marshall, TX 75670 | Oil & Gas Operator | Jun 1998 |
| 5240 | Cavins Oilfield Services, LLC. | | Oil Operator | Apr 2006 |
| 5241 | Caw Prop LP | Dayton, PA 16222-1624 | Gas Operator | Dec 2024 |
| 5242 | Cawell Energy, LLC | Spring, TX 77379 | Oil Operator | Feb 2026 |
| 5243 | Cayman Exploration Corp | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 5244 | Cayman Resources Corporation | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 5245 | Caza Exploration Company | | Oil Operator | Nov 1991 |
| 5246 | Caza Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 5247 | Cazador Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 5248 | Cazar Energy Inc | Austin, TX 78734 | Oil & Gas Operator | Feb 2026 |
| 5249 | CB Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2017 |
| 5250 | CB Oil Company | Drumright, OK 74030 | Oil & Gas Operator | Jul 2025 |
| 5251 | Cbase Corporation | | Oil & Gas Operator | Nov 2025 |
| 5252 | CBL Resources LLC | Tulsa, OK 74136-6308 | Oil & Gas Operator | Nov 2025 |
| 5253 | CBM Gas Company LLC | Dewey, OK 74029 | Oil & Gas Operator | Aug 2020 |
| 5254 | CBM Partners Corporation | Overland Park, KS 66221 | Oil Operator | Aug 2015 |
| 5255 | Cbmoncrief Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 5256 | CBN Operating Corp. | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 5257 | Cbo Oil And Gas, LLC | Stillwater, OK 74075-8793 | Oil & Gas Operator | Oct 2025 |
| 5258 | CBR Oil Company | Lytle, TX 78052 | Oil & Gas Operator | Jul 1997 |
| 5259 | CBS Energy LLC | Oklahoma City, OK 73142-4437 | Oil & Gas Operator | Nov 2025 |
| 5260 | CBS Operating Corp | Midland, TX 79702 | Oil & Gas Operator | Aug 2012 |
| 5261 | CCC Oil & Gas LLC | Jal, NM 88252 | Oil & Gas Operator | Aug 2024 |
| 5262 | CCF, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Apr 1998 |
| 5263 | CCGM Exploration & Prod.,L.C. | Austin, TX 78738 | Oil & Gas Operator | Feb 2026 |
| 5264 | Cci East Texas Upstream LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2021 |
| 5265 | Cci Gulf Coast Upstream LLC | Teague, TX 75860 | Oil & Gas Operator | Mar 2021 |
| 5266 | Cci Robinson'S Bend LLC | | Gas Operator | Oct 2025 |
| 5267 | CCM Enterprises, Inc | | Oil & Gas Operator | Oct 1985 |
| 5268 | CCRP Operating Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2024 |
| 5269 | CCS Investments Inc | Bartlesville, OK 74006-1941 | Oil Operator | Oct 2025 |
| 5270 | CCV, Inc. | Houston, TX 77019 | Oil & Gas Operator | Sep 1994 |
| 5271 | CD Consulting & Operating Co. | Bridgeport, TX 76426 | Oil & Gas Operator | Feb 2026 |
| 5272 | CD Resources Company | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2002 |
| 5273 | CDC Operating Company | Dallas, TX 75218 | Oil & Gas Operator | Feb 2026 |
| 5274 | CDG Inc | Sapulpa, OK 74066-6339 | Oil Operator | Oct 2020 |
| 5275 | CDJ Oil Co. | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 5276 | CDJ Oil Company, LLC | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 5277 | CDM Oil & Gas | | Oil & Gas Operator | Apr 2017 |
| 5278 | CDS Oil Company | Tulsa, OK 74147-1514 | Oil & Gas Operator | Mar 2015 |
| 5279 | CDX Gas, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2009 |
| 5280 | CDX Rio, LLC | Farmington, NM 87401 | Oil & Gas Operator | Aug 2009 |
| 5281 | Cec Operations LLC | Udall, KS 67146 | Oil & Gas Operator | Sep 2025 |
| 5282 | Cecil Brand | | Oil & Gas Operator | Mar 2002 |
| 5283 | Cecil Lee'S Co | Tatum, NM 88267 | Oil Operator | Jan 2003 |
| 5284 | Cedar Bend Oil Company | Colorado City, TX 79512 | Oil & Gas Operator | Feb 2026 |
| 5285 | Cedar Creek Consulting Inc | | Oil Operator | Jan 2025 |
| 5286 | Cedar Grove Energy Corp. | | Oil Operator | Sep 2009 |
| 5287 | Cedar Grove Missionary Baptist Church | Cheektowaga, NY 14225 | Gas Operator | Dec 2024 |
| 5288 | Cedar Oil Company | Midland, TX 79707 | Oil & Gas Operator | Feb 2026 |
| 5289 | Cedar Point Oil Company | Baytown, TX 77520 | Oil & Gas Operator | Aug 2003 |
| 5290 | Cedar Resources Corporation | Gillette, WY 82717 | Gas Operator | Dec 2010 |
| 5291 | Cedar Ridge Energy, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Feb 2026 |
| 5292 | Cedar Ridge Operating Co LLC | Durango, CO 81303 | Gas Operator | Dec 2009 |
| 5293 | Cedar Valley Energy Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2021 |
| 5294 | Cedarhill Operating Company, L.L.C. | | Oil Operator | Dec 2007 |
| 5295 | Cedyco Corporation | Houston, TX 77227 | Oil & Gas Operator | Nov 2008 |
| 5296 | Cegx Of Texas LLC | Eastland, TX 76448 | Oil Operator | Mar 2018 |
| 5297 | Ceh Operating LLC | | Oil & Gas Operator | Nov 2025 |
| 5298 | Cei Operating LLC | Katy, TX 77449 | Oil & Gas Operator | Feb 2026 |
| 5299 | Cei Petroleum Inc | Tulsa, OK 74103-4141 | Oil & Gas Operator | Jul 2016 |
| 5300 | Cei Production Company | Dallas, TX 75225 | Oil & Gas Operator | Sep 1998 |