| 201 | Cody Energy LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2020 |
| 202 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 203 | Commonwealth Royalty, LLC | Balmorhea, TX 79718 | Oil Operator | Jul 2025 |
| 204 | Comstock Energy, LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Jul 2025 |
| 205 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 206 | Concho Resources Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2004 |
| 207 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 208 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 209 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 210 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Jul 2025 |
| 211 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 212 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Jul 2025 |
| 213 | Contrast Energy, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jul 2025 |
| 214 | Convert Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2019 |
| 215 | Cook, Kenneth D. Operator | Midland, TX 79707 | Oil Operator | Jul 2025 |
| 216 | Corda Corporation | Wichita Falls, TX 76302 | Oil & Gas Operator | Jul 2025 |
| 217 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Jul 2025 |
| 218 | Coronado Minerals, LLC | Houston, TX 77208 | Oil & Gas Operator | Jul 2025 |
| 219 | Corvette Oil Corporation | Fort Worth, TX 76115 | Oil & Gas Operator | Mar 2008 |
| 220 | Costa Resources, Inc. | Dallas, TX 75209 | Oil & Gas Operator | Aug 2003 |
| 221 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 222 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 223 | Couch, Gilbert | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 224 | Couch, Harry L. | Odessa, TX 79762 | Oil & Gas Operator | Nov 1994 |
| 225 | Covenant Production Co., L.C. | Midland, TX 79702 | Oil & Gas Operator | Nov 2002 |
| 226 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 227 | Crabtree And Brown, Inc. | Kermit, TX 79745 | Oil & Gas Operator | Feb 1995 |
| 228 | Creamer, Donald R., Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2006 |
| 229 | Crestridge DRLG. & Prod.Co.,LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2023 |
| 230 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 231 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 232 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 233 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 234 | Cuervo Resources, Inc. | FT Stockton, TX 79735 | Oil & Gas Operator | Oct 1996 |
| 235 | Cuervo, Inc. | FT Stockton, TX 79735 | Oil & Gas Operator | Jul 2025 |
| 236 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | Jul 2025 |
| 237 | D & B Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 238 | D & V Oil Co., LP | San Angelo, TX 76909 | Oil & Gas Operator | Jan 2019 |
| 239 | D And B Oil | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 240 | D G D Oil Co. | Imperial, TX 79743 | Oil & Gas Operator | Jul 2025 |
| 241 | Dakota Resources, Inc | Midland, TX 79707 | Oil & Gas Operator | Feb 2025 |
| 242 | Dakota Resources, Inc. (I) | Midland, TX 79707 | Oil & Gas Operator | Jul 2025 |
| 243 | Dale Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 2025 |
| 244 | Dallas Operating Corp. | Dallas, TX 75205 | Oil & Gas Operator | Nov 2006 |
| 245 | Dally'S Oil Co. LLC | Monahans, TX 79756 | Oil Operator | Jul 2025 |
| 246 | Darkens Oil & Gas Inc. | MC Camey, TX 79752 | Oil & Gas Operator | Jul 2025 |
| 247 | Dawson Operating Company | Midland, TX 79702 | Oil & Gas Operator | Dec 1994 |
| 248 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Apr 2025 |
| 249 | Dean Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2019 |
| 250 | Deg Energy, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Feb 2007 |
| 251 | Delek Energy Systems Us Inc | Denver, CO 80202 | Oil & Gas Operator | Oct 2011 |
| 252 | Delhi Gas Pipeline Corporation | Palestine, TX 75802 | Oil & Gas Operator | Feb 1998 |
| 253 | Delray Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2025 |
| 254 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 255 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 256 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 257 | Diamond G Production | FT Stockton, TX 79735 | Oil & Gas Operator | Jul 2025 |
| 258 | Diamond M Oil Co., Inc. | Monahans, TX 79756 | Oil & Gas Operator | Jul 2025 |
| 259 | Diamondback E&P LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 260 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 261 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 262 | Dittman, D. W. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2007 |
| 263 | Dixon, N. D. | Midland, TX 79702 | Oil & Gas Operator | Feb 2003 |
| 264 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Jul 2025 |
| 265 | Dolch Production, Inc. | San Antonio, TX 78248 | Oil & Gas Operator | Jul 1996 |
| 266 | Dominion Natural Resources LLC | Dallas, TX 75367 | Oil & Gas Operator | Jul 2025 |
| 267 | Dorado Oil Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Oct 2013 |
| 268 | Double Barrel Oil LLC | Brenham, TX 77834 | Oil & Gas Operator | Jul 2025 |
| 269 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Jul 2025 |
| 270 | Draco Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 271 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 272 | Drillmar Energy, Inc. | Houston, TX 77079 | Oil & Gas Operator | Nov 2014 |
| 273 | DSR Oil & Gas, Inc. | Monahans, TX 79756 | Oil & Gas Operator | Jul 2025 |
| 274 | Dudley Oil Co. | Crane, TX 79731 | Oil & Gas Operator | Jan 2006 |
| 275 | Dugan Production Corp | Farmington, NM 87499 | Oil & Gas Operator | May 2025 |
| 276 | Dundee Oil & Supply Inc | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2001 |
| 277 | Dundee Petroleum, Inc. | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 2003 |
| 278 | Dune Oil And Gas, Inc. | Odessa, TX 79768 | Oil & Gas Operator | Aug 2006 |
| 279 | Durango Resources Corp. | Houston, TX 77043 | Oil & Gas Operator | Jul 2025 |
| 280 | Dyad Petroleum Company | Midland, TX 79710 | Oil & Gas Operator | Sep 2021 |
| 281 | E.G.L. Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 282 | Eagle Energy | Midland, TX 79710 | Oil & Gas Operator | Aug 1994 |
| 283 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Jul 2025 |
| 284 | Eagle Rock Operating Company,LLC | Houston, TX 77252 | Oil & Gas Operator | Oct 2015 |
| 285 | Earnest Producing Corporation | Midland, TX 79704 | Oil & Gas Operator | Jul 2025 |
| 286 | Eason Production Company | Atlanta, TX 75551 | Oil & Gas Operator | May 2007 |
| 287 | Eclipse Oil & Gas, Inc. | Midland, TX 79703 | Oil & Gas Operator | Jul 2025 |
| 288 | Ecoserv Environmental SVCS, LLC | Abbeville, LA 70510 | Oil Operator | Jul 2025 |
| 289 | Edward Oil Company | Youngsville, PA 16371 | Oil & Gas Operator | Nov 2024 |
| 290 | Edwards-Foster, Inc. | Midland, TX 79708 | Oil & Gas Operator | Aug 1996 |
| 291 | Eggleston, Garaland | Big Lake, TX 76932 | Oil & Gas Operator | Aug 2003 |
| 292 | El Dorado Gas & Oil, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 293 | El Reno Energy, LLC | Granbury, TX 76048 | Oil & Gas Operator | Jul 2025 |
| 294 | Elam, Jack G. | Midland, TX 79702 | Oil & Gas Operator | Dec 2002 |
| 295 | Elam, Jack G., Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2002 |
| 296 | Elco Oil & Gas | San Angelo, TX 76902 | Oil & Gas Operator | Dec 2014 |
| 297 | Emerald Production Company | Midland, TX 79702 | Oil & Gas Operator | Jun 1995 |
| 298 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 299 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | May 2025 |
| 300 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |