| 201 | Covenant Oil Company | Houma, LA 70360 | Oil & Gas Operator | Dec 2015 |
| 202 | Covenant Operating, LLC | Wichita Falls, TX 76308 | Oil Operator | Dec 2025 |
| 203 | Craft Resources, Inc. | Weston, TX 75097 | Oil & Gas Operator | Aug 2003 |
| 204 | Craig Oil, Inc. | Olney, TX 76374 | Oil Operator | Dec 2025 |
| 205 | Craig, Bob | Olney, TX 76374 | Oil & Gas Operator | Dec 2025 |
| 206 | Craig, Carl | Olney, TX 76374 | Oil & Gas Operator | Dec 2025 |
| 207 | Craig, Robert A. | Olney, TX 76374 | Oil Operator | Dec 2025 |
| 208 | Creswell, Chris | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 209 | Creswell, R.G. | Graham, TX 76450 | Oil & Gas Operator | Feb 2013 |
| 210 | Crimson Energy Company, LC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2004 |
| 211 | CRJ Bond Operations, LLC | Graham, TX 76450 | Oil Operator | Dec 2025 |
| 212 | Crossbow Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 213 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 214 | Crutcher Oil Properties | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 2025 |
| 215 | Cumberland Petroleum, Inc. II | Weatherford, TX 76086 | Oil & Gas Operator | May 1997 |
| 216 | Cwic, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Dec 2025 |
| 217 | D & B Oil Company | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 218 | D & H Investments | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2025 |
| 219 | D & L Operating Co. | Bangs, TX 76823 | Oil & Gas Operator | Nov 2022 |
| 220 | D L Operating | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 221 | D.J. & T. Energy | Abilene, TX 79601 | Oil & Gas Operator | Dec 2025 |
| 222 | D.J.F. Services, Inc. | Holdenville, OK 74848 | Oil & Gas Operator | Dec 2025 |
| 223 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 224 | Dain Oil | Graham, TX 76450 | Oil & Gas Operator | Dec 2007 |
| 225 | Dallas Operating Corp. | Dallas, TX 75205 | Oil & Gas Operator | Nov 2006 |
| 226 | Dallas Production Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 227 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 228 | Dartex Energy Inc | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 229 | Davis, R. E. Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2015 |
| 230 | Davis, Robert E. | Graham, TX 76450 | Oil & Gas Operator | Apr 1997 |
| 231 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Dec 2025 |
| 232 | Decleva, Paul | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2020 |
| 233 | Dedica Energy Corporation | Mattoon, IL 61938 | Oil & Gas Operator | Mar 2008 |
| 234 | Deen Drilling Company | Archer City, TX 76351 | Oil & Gas Operator | Dec 2025 |
| 235 | Delaney Oil And Gas Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 236 | Delray Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2025 |
| 237 | Delta Oil & Gas Company | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2003 |
| 238 | Delta Oil & Gas LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 239 | Demoss, L. V. | Graham, TX 76450 | Oil & Gas Operator | May 2004 |
| 240 | Denman-Friesen Co. | Lufkin, TX 75901 | Oil & Gas Operator | Nov 2006 |
| 241 | Denoco Inc. | Plano, TX 75086 | Oil & Gas Operator | Mar 2008 |
| 242 | Denton Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Dec 2025 |
| 243 | Derby Oil Of Texas | Ventura, CA 93003 | Oil & Gas Operator | May 1996 |
| 244 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 245 | Diamond M DRLG & Expl Co. | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2025 |
| 246 | Dick Lindsay Oil Company, Inc. | Graham, TX 76450 | Oil Operator | Dec 2025 |
| 247 | DJ & T Services, LLC | Abilene, TX 79601 | Oil & Gas Operator | Dec 2025 |
| 248 | DJD Drilling Corporation | Graham, TX 76450 | Oil Operator | Jan 2010 |
| 249 | DM Backhoe Service | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 250 | Dolberry Energy Resources Corp. | Dallas, TX 75252 | Oil Operator | Dec 2025 |
| 251 | Domestic Crude | Graham, TX 76450 | Oil & Gas Operator | Jul 2000 |
| 252 | Dominion Natural Resources LLC | Dallas, TX 75367 | Oil & Gas Operator | Dec 2025 |
| 253 | Don Bar Investment Company | Windthorst, TX 76389 | Oil & Gas Operator | Feb 2004 |
| 254 | Don Peterson Company, LLC - | Loving, TX 76460 | Oil Operator | Dec 2025 |
| 255 | Donnell, Bill | Graham, TX 76450 | Oil & Gas Operator | May 1995 |
| 256 | Donnell, Louis, Jr. | South Bend, TX 76481 | Oil & Gas Operator | Mar 2008 |
| 257 | Dooley, Jeff | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2012 |
| 258 | Double J Enterprises | Loving, TX 76460 | Oil Operator | Dec 2025 |
| 259 | Double K Production | Graham, TX 76450 | Oil & Gas Operator | Sep 2014 |
| 260 | Double L Operating | Graham, TX 76450 | Oil & Gas Operator | Nov 2018 |
| 261 | Double M Petroproperties, Inc. | Haskell, TX 79521 | Oil & Gas Operator | Dec 2025 |
| 262 | Drake Petroleum, LLC | Cypress, TX 77429 | Oil & Gas Operator | Jun 2023 |
| 263 | Drennan, D. E. | Graham, TX 76450 | Oil & Gas Operator | Dec 2011 |
| 264 | Dry Fork Production Co., LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 265 | Duncan Land & Exploration, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 266 | E & W Production | Olney, TX 76374 | Oil & Gas Operator | Aug 2018 |
| 267 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 268 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Dec 2025 |
| 269 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 270 | Edge Exploration, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2006 |
| 271 | Edge, Fred Well Service Co. | Archer City, TX 76351 | Oil & Gas Operator | May 2024 |
| 272 | Eldorado Oil And Gas, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Nov 1995 |
| 273 | Ellard Oil | Loving, TX 76460 | Oil & Gas Operator | May 2022 |
| 274 | Ellard, Herman | Graham, TX 76450 | Oil & Gas Operator | Feb 2005 |
| 275 | Ellis, Amon | Olney, TX 76374 | Oil & Gas Operator | Aug 2003 |
| 276 | Embassy Oil Company | Highland VLG, TX 75077 | Oil & Gas Operator | Dec 2025 |
| 277 | Emco Oil & Gas | Graham, TX 76450 | Oil & Gas Operator | Dec 1995 |
| 278 | Emco Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2002 |
| 279 | Energy Group Of America, Inc. | Hollister, MO 65672 | Oil Operator | Dec 2025 |
| 280 | Energy Resource & Develop., Corp | Rockwall, TX 75087 | Oil & Gas Operator | Jun 1998 |
| 281 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Aug 2025 |
| 282 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 283 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Dec 2025 |
| 284 | Enr Operating, LLC | Eunice, NM 88231 | Oil & Gas Operator | Dec 2025 |
| 285 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 286 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 287 | Ericksen, W.R. | Hobbs, NM 88240 | Oil & Gas Operator | Nov 1993 |
| 288 | Ernmar Investments, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Dec 2025 |
| 289 | Erwin Operating | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 290 | Escoba Royalty Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Nov 2005 |
| 291 | Esg Resources LLC | Dallas, TX 75231 | Oil & Gas Operator | Dec 2025 |
| 292 | Esna Operating Co., Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 1994 |
| 293 | Eurotex Royalty, Inc. | Arlington, TX 76012 | Oil & Gas Operator | Aug 2003 |
| 294 | Evans, Carl N. | Graham, TX 76450 | Oil & Gas Operator | Feb 2001 |
| 295 | Evantech Energy Corp. | Fort Worth, TX 76120 | Oil & Gas Operator | Apr 1995 |
| 296 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | Dec 2025 |
| 297 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Aug 2025 |
| 298 | Exorare Energy, Inc. | Dallas, TX 75218 | Oil & Gas Operator | Dec 2025 |
| 299 | Exp, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 2003 |
| 300 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Dec 2025 |