| 201 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 202 | Carlton, Wayne Inc. | Bronte, TX 76933 | Oil & Gas Operator | Dec 2002 |
| 203 | Caroil, LLC | Odessa, TX 79761 | Oil Operator | Jun 2026 |
| 204 | Carol-Holly Oil Corporation | Denver, CO 80237 | Oil & Gas Operator | Apr 2026 |
| 205 | Carotex Energy, Inc. | Wilson, NC 27893 | Oil & Gas Operator | Aug 2003 |
| 206 | Carpco Efficient Energy Co., LLC | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2026 |
| 207 | Carpenter Corporation | Sourlake, TX 77659 | Oil & Gas Operator | Oct 1994 |
| 208 | Carpenter Services | Colorado City, TX 79512 | Oil & Gas Operator | May 1996 |
| 209 | Carr Exploration Corp. | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 210 | Carr Resources, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Jun 2026 |
| 211 | Carrizo (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jan 2020 |
| 212 | Carrizo (Permian) LLC | Houston, TX 77042 | Oil & Gas Operator | Jan 2020 |
| 213 | Carrizo Exploration, Inc. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Aug 2016 |
| 214 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 215 | Carrland Oil & Gas Inc. | Prosper, TX 75078 | Oil & Gas Operator | Jun 2026 |
| 216 | Carroll Operating, LLC | Abilene, TX 79608 | Oil & Gas Operator | Feb 2022 |
| 217 | Carroll, Alvis J. | Wichita Falls, TX 76302 | Oil & Gas Operator | Mar 2008 |
| 218 | Carruth Oil & Gas, LLC | Andrews, TX 79714 | Oil & Gas Operator | Jun 2026 |
| 219 | Carruth, Chris | Andrews, TX 79714 | Oil & Gas Operator | Nov 2017 |
| 220 | Carson Buckles Exploration LLC | Amarillo, TX 79159 | Oil & Gas Operator | Jun 2026 |
| 221 | Carter Cattle & Crude Company | Luling, TX 78648 | Oil & Gas Operator | Jun 2026 |
| 222 | Carter E&P, LLC | Johnson City, TX 78636 | Oil & Gas Operator | Dec 2016 |
| 223 | Carter Energy Corporation | Duncanville, TX 75138 | Oil & Gas Operator | Sep 2010 |
| 224 | Carter Exploration Company | Corpus Christ, TX 78413 | Oil & Gas Operator | Feb 2015 |
| 225 | Carter Resources | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2005 |
| 226 | Carter, Gertrude (Trudy) | Rockwall, TX 75032 | Oil & Gas Operator | Apr 2013 |
| 227 | Carter, Mattye Family Trust | Fort Worth, TX 76109 | Oil & Gas Operator | Oct 2002 |
| 228 | Carter, Mattye L., Estate Of | Gladewater, TX 75647 | Oil & Gas Operator | Feb 1995 |
| 229 | Carter, Shirley Oil Co | Round Rock, TX 78665 | Oil & Gas Operator | Jun 2018 |
| 230 | Carter-Langham, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Jun 2026 |
| 231 | Cartex Production | Pampa, TX 79066 | Oil & Gas Operator | Jun 2026 |
| 232 | Cartex Production Corp. | Pampa, TX 79066 | Oil & Gas Operator | Nov 2000 |
| 233 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 234 | Cary Oil & Gas, Inc | Decatur, TX 76234 | Oil & Gas Operator | Jun 2026 |
| 235 | Casa Operations | Borger, TX 79007 | Oil & Gas Operator | Jun 2026 |
| 236 | Cascade Petroleum Corporation | Quitman, TX 75783 | Oil & Gas Operator | Mar 2002 |
| 237 | Cascade Resources LLC | Edmond, OK 73083 | Oil & Gas Operator | Mar 2026 |
| 238 | Case Oil | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2026 |
| 239 | Case Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Jun 2026 |
| 240 | Case, C. W. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2026 |
| 241 | Casey, W. J. | Fairfield, TX 75840 | Oil & Gas Operator | Jun 2026 |
| 242 | Cashco Oil Company | Houston, TX 77024 | Oil & Gas Operator | Aug 2003 |
| 243 | Cashco, L.L.C. | Houston, TX 77024 | Oil & Gas Operator | Jul 1999 |
| 244 | Cashion, Lyle, Company | Brandon, MS 39047 | Oil & Gas Operator | May 2008 |
| 245 | Casias Oil Well Service, Inc. | San Antonio, TX 78232 | Oil & Gas Operator | Jul 2020 |
| 246 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Mar 2026 |
| 247 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Jun 2026 |
| 248 | Caspen Oil, Inc. | Lakewood, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 249 | Caspen Operating Company | Somerset, TX 78069 | Oil & Gas Operator | Mar 2008 |
| 250 | Casper Oil & Gas | Bandera, TX 78003 | Oil & Gas Operator | Oct 2002 |
| 251 | Cass Energy Corp | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 252 | Cass Energy LLC | MT Vernon, TX 75457 | Oil Operator | Jun 2026 |
| 253 | Cassity Company | Wichita Falls, TX 76309 | Oil & Gas Operator | Jul 2013 |
| 254 | Casteel, Hoyt F. | Graham, TX 76450 | Oil & Gas Operator | Nov 2001 |
| 255 | Castex Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 256 | Castillo Oil Company LLC | Luling, TX 78648 | Oil & Gas Operator | Jun 2026 |
| 257 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 258 | Castle Gas Corporation | San Angelo, TX 76902 | Oil & Gas Operator | Oct 2014 |
| 259 | Castle Operating LLC | Oklahoma City, OK 73114-7444 | Oil & Gas Operator | Feb 2026 |
| 260 | Castle Production Company | Henderson, TX 75652 | Oil & Gas Operator | May 1997 |
| 261 | Castlerock Ef Operating LLC | San Antonio, TX 78232 | Oil & Gas Operator | Jun 2026 |
| 262 | Castlerock Oil Company, Inc. | Addison, TX 75001 | Oil & Gas Operator | Feb 2006 |
| 263 | Castlerock Operating, LLC | San Antonio, TX 78232 | Oil & Gas Operator | Dec 2020 |
| 264 | Caswell Bros. Oil Co. | Bowie, TX 76230 | Oil & Gas Operator | Jun 2026 |
| 265 | Catarina Petroleum L. C. | Dallas, TX 75228 | Oil & Gas Operator | Jun 2008 |
| 266 | Catfish Minerals LLC | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 267 | Cathexis Oil & Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2014 |
| 268 | Cathey Petroleum Company, Inc. | Big Spring, TX 79720 | Oil & Gas Operator | Apr 2008 |
| 269 | Caths Oil & Gas | Midland, TX 79706 | Oil & Gas Operator | Jun 2026 |
| 270 | Catlin Drilling Company | Iowa Park, TX 76367 | Oil & Gas Operator | Aug 2003 |
| 271 | Catlin, Carl | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2008 |
| 272 | Catlin, Cecil | Iowa Park, TX 76367 | Oil & Gas Operator | Dec 1995 |
| 273 | Catlin, Cecil, Oil Co. | Iowa Park, TX 76367 | Oil & Gas Operator | Jun 2000 |
| 274 | Catlin, Delbert | Iowa Park, TX 76367 | Oil & Gas Operator | Jun 2026 |
| 275 | Catlin, Randy | Iowa Park, TX 76367 | Oil Operator | Jun 2026 |
| 276 | Catoilan Corporation | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 277 | Caturus Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2026 |
| 278 | Cavalcade Operating Company LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2017 |
| 279 | Cavalier Oil & Gas, Inc. | Buchanan Dam, TX 78609 | Oil & Gas Operator | Jun 2026 |
| 280 | Cavalry Resources LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2010 |
| 281 | Cavilla Energy, Inc. | Longview, TX 75606 | Oil Operator | Jun 2026 |
| 282 | Cavillo Oil Company LC Of Texas | Marshall, TX 75671 | Oil & Gas Operator | Jun 2026 |
| 283 | Cavillo Oil Corporation | Marshall, TX 75670 | Oil & Gas Operator | Jun 1998 |
| 284 | Cawell Energy, LLC | Spring, TX 77379 | Oil Operator | Jun 2026 |
| 285 | Caza Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2026 |
| 286 | Cazador Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 287 | Cazar Energy Inc | Austin, TX 78734 | Oil & Gas Operator | Jun 2026 |
| 288 | CB Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2017 |
| 289 | CBM Partners Corporation | Overland Park, KS 66221 | Oil Operator | Aug 2015 |
| 290 | Cbmoncrief Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2026 |
| 291 | CBN Operating Corp. | Austin, TX 78746 | Oil & Gas Operator | Jun 2026 |
| 292 | CBR Oil Company | Lytle, TX 78052 | Oil & Gas Operator | Jul 1997 |
| 293 | CCF, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Apr 1998 |
| 294 | CCGM Exploration & Prod.,L.C. | Austin, TX 78738 | Oil & Gas Operator | Jun 2026 |
| 295 | Cci East Texas Upstream LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2021 |
| 296 | Cci Gulf Coast Upstream LLC | Teague, TX 75860 | Oil & Gas Operator | Mar 2021 |
| 297 | CCV, Inc. | Houston, TX 77019 | Oil & Gas Operator | Sep 1994 |
| 298 | CD Consulting & Operating Co. | Bridgeport, TX 76426 | Oil & Gas Operator | Jun 2026 |
| 299 | CD Resources Company | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2002 |
| 300 | CDC Operating Company | Dallas, TX 75218 | Oil & Gas Operator | Jun 2026 |