| 201 | Caribou Operating Co. | Granbury, TX 76048 | Oil & Gas Operator | Mar 2010 |
| 202 | Caribou Operating, Inc. | Granbury, TX 76048 | Oil & Gas Operator | Feb 2026 |
| 203 | Carken LLC | Andrews, TX 79714 | Oil Operator | Feb 2026 |
| 204 | Carl Oil & Gas Co. | Bakersfield, CA 93309 | Oil & Gas Operator | Dec 1995 |
| 205 | Carlon Oil & Gas Co Inc | Derby, KS 67037 | Gas Operator | Dec 2025 |
| 206 | Carloran Production Corp | Windthorst, TX 76389 | Oil & Gas Operator | Feb 2026 |
| 207 | Carlow Corp. | Midland, TX 79702 | Oil & Gas Operator | Nov 2025 |
| 208 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 209 | Carlton, Wayne Inc. | Bronte, TX 76933 | Oil & Gas Operator | Dec 2002 |
| 210 | Caroil, LLC | Odessa, TX 79761 | Oil Operator | Feb 2026 |
| 211 | Carol-Holly Oil Corporation | Denver, CO 80237 | Oil & Gas Operator | Dec 2025 |
| 212 | Carotex Energy, Inc. | Wilson, NC 27893 | Oil & Gas Operator | Aug 2003 |
| 213 | Carpco Efficient Energy Co., LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 214 | Carpenter Corporation | Sourlake, TX 77659 | Oil & Gas Operator | Oct 1994 |
| 215 | Carpenter Services | Colorado City, TX 79512 | Oil & Gas Operator | May 1996 |
| 216 | Carr Exploration Corp. | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 217 | Carr Resources, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2026 |
| 218 | Carr Well Service Inc | Odessa, TX 79769 | Oil & Gas Operator | Nov 1996 |
| 219 | Carrizo (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jan 2020 |
| 220 | Carrizo (Permian) LLC | Houston, TX 77042 | Oil & Gas Operator | Jan 2020 |
| 221 | Carrizo Exploration, Inc. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Aug 2016 |
| 222 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 223 | Carrland Oil & Gas Inc. | Prosper, TX 75078 | Oil & Gas Operator | Feb 2026 |
| 224 | Carroll Operating, LLC | Abilene, TX 79608 | Oil & Gas Operator | Feb 2022 |
| 225 | Carroll, Alvis J. | Wichita Falls, TX 76302 | Oil & Gas Operator | Mar 2008 |
| 226 | Carruth Oil & Gas, LLC | Andrews, TX 79714 | Oil & Gas Operator | Feb 2026 |
| 227 | Carruth, Chris | Andrews, TX 79714 | Oil & Gas Operator | Nov 2017 |
| 228 | Carson Buckles Exploration LLC | Amarillo, TX 79159 | Oil & Gas Operator | Feb 2026 |
| 229 | Carter Cattle & Crude Company | Luling, TX 78648 | Oil & Gas Operator | Feb 2026 |
| 230 | Carter E&P, LLC | Johnson City, TX 78636 | Oil & Gas Operator | Dec 2016 |
| 231 | Carter Energy Corporation | Duncanville, TX 75138 | Oil & Gas Operator | Sep 2010 |
| 232 | Carter Exploration Company | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Feb 2015 |
| 233 | Carter Resources | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2005 |
| 234 | Carter, Gertrude (Trudy) | Rockwall, TX 75032 | Oil & Gas Operator | Apr 2013 |
| 235 | Carter, Mattye Family Trust | Fort Worth, TX 76109 | Oil & Gas Operator | Oct 2002 |
| 236 | Carter, Mattye L., Estate Of | Gladewater, TX 75647 | Oil & Gas Operator | Feb 1995 |
| 237 | Carter, Shirley Oil Co | Round Rock, TX 78665 | Oil & Gas Operator | Jun 2018 |
| 238 | Carter, Thomas J. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1995 |
| 239 | Carter-Langham, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Feb 2026 |
| 240 | Cartex Production | Pampa, TX 79066 | Oil & Gas Operator | Feb 2026 |
| 241 | Cartex Production Corp. | Pampa, TX 79066 | Oil & Gas Operator | Nov 2000 |
| 242 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 243 | Cary Oil & Gas, Inc | Decatur, TX 76234 | Oil & Gas Operator | Feb 2026 |
| 244 | Casa Oil And Gas Company | George West, TX 78022 | Gas Operator | Sep 2005 |
| 245 | Casa Operations | Borger, TX 79007 | Oil & Gas Operator | Feb 2026 |
| 246 | Casador Oil & Gas Co. | Keller, TX 76248 | Gas Operator | Aug 2003 |
| 247 | Cascade Petroleum Corporation | Quitman, TX 75783 | Oil & Gas Operator | Mar 2002 |
| 248 | Cascade Resources LLC | Edmond, OK 73083 | Oil & Gas Operator | Dec 2025 |
| 249 | Casco Energy, Inc. | Denison, TX 75020 | Oil & Gas Operator | May 1996 |
| 250 | Case Oil | Burkburnett, TX 76354 | Oil & Gas Operator | Feb 2026 |
| 251 | Case Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 252 | Case, C. W. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 253 | Casey, W. J. | Fairfield, TX 75840 | Oil & Gas Operator | Feb 2026 |
| 254 | Cashco Oil Company | Houston, TX 77024 | Oil & Gas Operator | Aug 2003 |
| 255 | Cashco, L.L.C. | Houston, TX 77024 | Oil & Gas Operator | Jul 1999 |
| 256 | Cashion, Lyle, Company | Brandon, MS 39047 | Oil & Gas Operator | May 2008 |
| 257 | Casias Oil Well Service, Inc. | San Antonio, TX 78232 | Oil & Gas Operator | Jul 2020 |
| 258 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Dec 2025 |
| 259 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Feb 2026 |
| 260 | Caspen Oil, Inc. | Denver, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 261 | Caspen Operating Company | Somerset, TX 78069 | Oil & Gas Operator | Mar 2008 |
| 262 | Casper Oil & Gas | Bandera, TX 78003 | Oil & Gas Operator | Oct 2002 |
| 263 | Cass Energy Corp | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 264 | Cass Energy LLC | MT Vernon, TX 75457 | Oil Operator | Feb 2026 |
| 265 | Cassity Company | Wichita Falls, TX 76309 | Oil & Gas Operator | Jul 2013 |
| 266 | Casteel, Hoyt F. | Graham, TX 76450 | Oil & Gas Operator | Nov 2001 |
| 267 | Castex Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 268 | Castillo Oil Company LLC | Luling, TX 78648 | Oil & Gas Operator | Feb 2026 |
| 269 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 270 | Castle Gas Corporation | San Angelo, TX 76902 | Oil & Gas Operator | Oct 2014 |
| 271 | Castle Operating LLC | Oklahoma City, OK 73114-7444 | Oil & Gas Operator | Nov 2025 |
| 272 | Castle Production Company | Henderson, TX 75652 | Oil & Gas Operator | May 1997 |
| 273 | Castlerock Ef Operating LLC | San Antonio, TX 78232 | Oil & Gas Operator | Feb 2026 |
| 274 | Castlerock Oil Company, Inc. | Addison, TX 75001 | Oil & Gas Operator | Feb 2006 |
| 275 | Castlerock Operating, LLC | San Antonio, TX 78232 | Oil & Gas Operator | Dec 2020 |
| 276 | Caswell Bros. Oil Co. | Bowie, TX 76230 | Oil & Gas Operator | Feb 2026 |
| 277 | Catarina Petroleum L. C. | Dallas, TX 75228 | Oil & Gas Operator | Jun 2008 |
| 278 | Catfish Minerals LLC | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 279 | Cathexis Oil & Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2014 |
| 280 | Cathey Petroleum Company, Inc. | Big Spring, TX 79720 | Oil & Gas Operator | Apr 2008 |
| 281 | Caths Oil & Gas | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 282 | Catlin Drilling Company | Iowa Park, TX 76367 | Oil & Gas Operator | Aug 2003 |
| 283 | Catlin, Carl | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2008 |
| 284 | Catlin, Cecil | Iowa Park, TX 76367 | Oil & Gas Operator | Dec 1995 |
| 285 | Catlin, Cecil, Oil Co. | Iowa Park, TX 76367 | Oil & Gas Operator | Jun 2000 |
| 286 | Catlin, Delbert | Iowa Park, TX 76367 | Oil & Gas Operator | Feb 2026 |
| 287 | Catlin, Randy | Iowa Park, TX 76367 | Oil Operator | Feb 2026 |
| 288 | Catoilan Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 289 | Caturus Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 290 | Cavalcade Operating Company LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2017 |
| 291 | Cavalier Oil & Gas, Inc. | Buchanan Dam, TX 78609 | Oil & Gas Operator | Feb 2026 |
| 292 | Cavalry Resources LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2010 |
| 293 | Cavilla Energy, Inc. | Longview, TX 75606 | Oil Operator | Feb 2026 |
| 294 | Cavillo Oil Company LC Of Texas | Marshall, TX 75671 | Oil & Gas Operator | Feb 2026 |
| 295 | Cavillo Oil Corporation | Marshall, TX 75670 | Oil & Gas Operator | Jun 1998 |
| 296 | Cawell Energy, LLC | Spring, TX 77379 | Oil Operator | Feb 2026 |
| 297 | Caza Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 298 | Cazador Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 299 | Cazar Energy Inc | Austin, TX 78734 | Oil & Gas Operator | Feb 2026 |
| 300 | CB Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2017 |