| 5201 | Cat-Oil Inc. | | Oil Operator | Nov 2015 |
| 5202 | Catalyst Energy Inc | Pittsburgh, PA 15218 | Oil & Gas Operator | Feb 2025 |
| 5203 | Catamount Energy Partners LLC | Denver, CO 80202 | Gas Operator | Mar 2025 |
| 5204 | Catamount Resources, Inc. | Grafton, WV 26354-0000 | Gas Operator | Dec 2009 |
| 5205 | Catarina Petroleum L. C. | Dallas, TX 75228 | Oil & Gas Operator | Jun 2008 |
| 5206 | Catena Resources Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2022 |
| 5207 | Cates Betty J | Tulsa, OK 74112 | Oil & Gas Operator | Nov 2016 |
| 5208 | Catfish Minerals LLC | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 5209 | Catfish Oil | | Oil Operator | Nov 2024 |
| 5210 | Cather Rogers Barnes & Cree | | Oil & Gas Operator | Dec 2009 |
| 5211 | Cather, Barnes & Cree | | Oil & Gas Operator | Dec 2009 |
| 5212 | Cather-Herley Oil Company | | Oil & Gas Operator | Dec 2024 |
| 5213 | Cathexis Oil & Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2014 |
| 5214 | Cathey Oil, Inc. | | Oil & Gas Operator | Aug 2009 |
| 5215 | Cathey Petroleum Company, Inc. | Big Spring, TX 79720 | Oil & Gas Operator | Apr 2008 |
| 5216 | Cathey Production Company | Ryan, OK 73565-0485 | Oil Operator | Dec 2010 |
| 5217 | Caths Oil & Gas | Midland, TX 79706 | Oil & Gas Operator | Apr 2025 |
| 5218 | Catlett & Ferguson-Carl O & G | | Oil & Gas Operator | Jun 1978 |
| 5219 | Catlin Drilling Company | Iowa Park, TX 76367 | Oil & Gas Operator | Aug 2003 |
| 5220 | Catlin, Carl | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2008 |
| 5221 | Catlin, Cecil | Iowa Park, TX 76367 | Oil & Gas Operator | Dec 1995 |
| 5222 | Catlin, Cecil, Oil Co. | Iowa Park, TX 76367 | Oil & Gas Operator | Jun 2000 |
| 5223 | Catlin, Delbert | Iowa Park, TX 76367 | Oil & Gas Operator | Apr 2025 |
| 5224 | Catlin, Randy | Iowa Park, TX 76367 | Oil Operator | Apr 2025 |
| 5225 | Catoilan Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 5226 | Catron Oil Co | | Oil Operator | Dec 2023 |
| 5227 | Catron Oil Div - | | Oil Operator | Aug 1989 |
| 5228 | Catron Oil Division | | Oil Operator | Feb 2000 |
| 5229 | Catt Drilling Co. | Holyrood, KS 67450 | Oil Operator | Aug 1989 |
| 5230 | Cattlemans Oil O | | Oil Operator | Nov 1995 |
| 5231 | Cattlemans Oil Operations | | Oil Operator | Dec 2009 |
| 5232 | Cattlemans Oil Operations LLC | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 5233 | Caulkins Oil Company | Aztec, NM 87410 | Oil & Gas Operator | Oct 2024 |
| 5234 | Cavalcade Operating Company LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2017 |
| 5235 | Cavalier Oil & Gas, Inc. | Buchanan Dam, TX 78609 | Oil & Gas Operator | Apr 2025 |
| 5236 | Cavalier Oil Co. Et Al | | Oil Operator | Jan 1986 |
| 5237 | Cavalier Petroleum | Shelby, MT 59474 | Oil & Gas Operator | Oct 2014 |
| 5238 | Cavalry Resources LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2010 |
| 5239 | Cavender, Douglas W. | Hurricane, WV 25526 | Gas Operator | Dec 2021 |
| 5240 | Cavendish Petro Of Oh Inc | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1989 |
| 5241 | Cavenham Energy Resources Inc. | | Oil & Gas Operator | Apr 1991 |
| 5242 | Cavenham Energy Resrces Inc JV | | Oil Operator | Mar 1991 |
| 5243 | Cavenham Forest Ind., Inc. | | Oil & Gas Operator | Nov 1987 |
| 5244 | Cavenham Forest Ind., Inc. J V | | Oil Operator | Nov 1987 |
| 5245 | Cavilla Energy, Inc. | Longview, TX 75606 | Oil Operator | Apr 2025 |
| 5246 | Cavillo Oil Company LC Of Texas | Marshall, TX 75671 | Oil & Gas Operator | Apr 2025 |
| 5247 | Cavillo Oil Corporation | Marshall, TX 75670 | Oil & Gas Operator | Jun 1998 |
| 5248 | Cavins Oilfield Services, LLC. | | Oil Operator | Apr 2006 |
| 5249 | Cawell Energy, LLC | Spring, TX 77379 | Oil Operator | Apr 2025 |
| 5250 | Cayman Exploration Corp. | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 5251 | Cayman Resources Corporation | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 5252 | Caza Exploration Company | | Oil Operator | Nov 1991 |
| 5253 | Caza Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 5254 | Cazador Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 5255 | Cazar Energy Inc | Austin, TX 78734 | Oil & Gas Operator | Apr 2025 |
| 5256 | CB Energy Partners, LLC | Odessa, TX 79765 | Oil & Gas Operator | Apr 2025 |
| 5257 | CB Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2017 |
| 5258 | CB Oil Company | Drumright, OK 74030 | Oil & Gas Operator | Jan 2025 |
| 5259 | Cbase Corporation | | Oil & Gas Operator | Dec 2024 |
| 5260 | CBL Resources LLC | Tulsa, OK 74136-6308 | Oil & Gas Operator | Jan 2025 |
| 5261 | CBM Gas Company LLC | Dewey, OK 74029 | Oil & Gas Operator | Aug 2020 |
| 5262 | CBM Partners Corporation | Overland Park, KS 66221 | Oil Operator | Aug 2015 |
| 5263 | Cbmoncrief Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 5264 | CBN Operating Corp. | Austin, TX 78746 | Oil & Gas Operator | Apr 2025 |
| 5265 | Cbo Oil And Gas LLC | Stillwater, OK 74075-8793 | Oil Operator | Jan 2025 |
| 5266 | CBR Oil Company | Lytle, TX 78052 | Oil & Gas Operator | Jul 1997 |
| 5267 | CBS Energy LLC | Oklahoma City, OK 73142-4437 | Oil & Gas Operator | Jan 2025 |
| 5268 | CBS Operating Corp | Midland, TX 79702 | Oil & Gas Operator | Aug 2012 |
| 5269 | CCF, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Apr 1998 |
| 5270 | CCGM Exploration & Prod.,L.C. | Austin, TX 78738 | Oil & Gas Operator | Apr 2025 |
| 5271 | Cci East Texas Upstream LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2021 |
| 5272 | Cci Gulf Coast Upstream LLC | Teague, TX 75860 | Oil & Gas Operator | Mar 2021 |
| 5273 | Cci Paradox Upstream LLC | | Oil & Gas Operator | Feb 2024 |
| 5274 | Cci Robinson'S Bend LLC | | Gas Operator | Feb 2025 |
| 5275 | CCM Enterprises, Inc | | Oil & Gas Operator | Oct 1985 |
| 5276 | CCRP Operating Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2024 |
| 5277 | CCS Investments Inc | Bartlesville, OK 74006-1941 | Oil Operator | Jan 2025 |
| 5278 | CCT & Co. | Tucson, AZ 85704 | Oil & Gas Operator | Jan 1996 |
| 5279 | CCV, Inc. | Houston, TX 77019 | Oil & Gas Operator | Sep 1994 |
| 5280 | CD Consulting & Operating Co. | Bridgeport, TX 76426 | Oil & Gas Operator | Apr 2025 |
| 5281 | CD Resources Company | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2002 |
| 5282 | CDC Operating Company | Dallas, TX 75218 | Oil & Gas Operator | Apr 2025 |
| 5283 | CDG Inc | Sapulpa, OK 74066-6339 | Oil Operator | Oct 2020 |
| 5284 | CDJ Oil Co. | Albany, TX 76430 | Oil & Gas Operator | Apr 2025 |
| 5285 | CDM Oil & Gas | | Oil & Gas Operator | Oct 2018 |
| 5286 | CDS Oil Company | Tulsa, OK 74147-1514 | Oil & Gas Operator | Mar 2015 |
| 5287 | CDX Gas, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2009 |
| 5288 | CDX Rio, LLC | Farmington, NM 87401 | Oil & Gas Operator | Aug 2009 |
| 5289 | CDX Rockies LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2005 |
| 5290 | Cec Operations LLC | Udall, KS 67146 | Oil & Gas Operator | Dec 2024 |
| 5291 | Cecil Brand | | Oil & Gas Operator | Mar 2002 |
| 5292 | Cecil Lee'S Co | Tatum, NM 88267 | Oil Operator | Jan 2003 |
| 5293 | Cedar Bend Oil Company | Colorado City, TX 79512 | Oil & Gas Operator | Apr 2025 |
| 5294 | Cedar Creek Consulting Inc | | Oil Operator | Jan 2025 |
| 5295 | Cedar Grove Energy Corp. | | Oil Operator | Sep 2009 |
| 5296 | Cedar Grove Missionary Baptist Church | Cheektowaga, NY 14225 | Gas Operator | Dec 2023 |
| 5297 | Cedar Oil Company | Midland, TX 79707 | Oil & Gas Operator | Apr 2025 |
| 5298 | Cedar Point Oil Company | Baytown, TX 77520 | Oil & Gas Operator | Aug 2003 |
| 5299 | Cedar Resources Corporation | Gillette, WY 82717 | Gas Operator | Dec 2010 |
| 5300 | Cedar Ridge Energy, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Apr 2025 |