| 201 | Cox Operating Co. | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2000 |
| 202 | Cox, Lee Investments Inc. | Mineral Wells, TX 76067 | Oil & Gas Operator | Apr 2025 |
| 203 | CP Energy LLC | Edmond, OK 73034 | Oil Operator | Feb 2025 |
| 204 | CP Exploration TX Operating LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2017 |
| 205 | Craft Resources, Inc. | Weston, TX 75097 | Oil & Gas Operator | Aug 2003 |
| 206 | Craig, Bob | Olney, TX 76374 | Oil & Gas Operator | Apr 2025 |
| 207 | Craig, Carl | Olney, TX 76374 | Oil & Gas Operator | Apr 2025 |
| 208 | Creswell, Chris | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 209 | Cromeens Petroleum, Inc. | Mineral Wells, TX 76067 | Oil & Gas Operator | Sep 1996 |
| 210 | Crossbow Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 211 | Crouch Petroleum Company | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2015 |
| 212 | Cso Consulting | Bridgeport, TX 76426 | Oil & Gas Operator | Mar 2020 |
| 213 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2025 |
| 214 | CVS Production, LLC. | Plano, TX 75074 | Oil Operator | Apr 2025 |
| 215 | D L Operating | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 216 | D. A. B. Oil Service, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Nov 2012 |
| 217 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 218 | Daily, Carroll | Loving, TX 76460 | Oil & Gas Operator | Sep 2023 |
| 219 | Daleco Resources, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | Mar 2008 |
| 220 | Dales Oil Company | Loving, TX 76460 | Oil Operator | Apr 2025 |
| 221 | Dallas Petroleum Group, LLC | Dallas, TX 75379 | Oil & Gas Operator | Apr 2025 |
| 222 | Dallas Production Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Apr 2025 |
| 223 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 224 | Dallas Royalty, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2012 |
| 225 | Davis, Gowin | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2001 |
| 226 | Davis, R. E. Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2015 |
| 227 | Davis, Robert E. | Graham, TX 76450 | Oil & Gas Operator | Apr 1997 |
| 228 | Dearing, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2021 |
| 229 | Decleva, Paul | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2020 |
| 230 | Dedica Energy Corporation | Mattoon, IL 61938 | Oil & Gas Operator | Mar 2008 |
| 231 | Deen Drilling Company | Archer City, TX 76351 | Oil & Gas Operator | Apr 2025 |
| 232 | Del Mar Energy, Inc. | Van Alstyne, TX 75495 | Oil & Gas Operator | Apr 2025 |
| 233 | Delfin Operating, LLC | Dallas, TX 75243 | Oil & Gas Operator | Apr 2025 |
| 234 | Delta Exploration Company Inc | Denver, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 235 | Demoss, L. V. | Graham, TX 76450 | Oil & Gas Operator | May 2004 |
| 236 | Denton Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Apr 2025 |
| 237 | Desana Development Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 238 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 239 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 240 | Devon Gas Services, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2023 |
| 241 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Apr 2025 |
| 242 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 243 | Dimock Operating Company | Iowa Park, TX 76367 | Oil & Gas Operator | Apr 2025 |
| 244 | DJ Resources Inc | Bowie, TX 76230 | Oil & Gas Operator | Nov 2017 |
| 245 | DM Backhoe Service | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 246 | Doc'S Tank Trucks | Jacksboro, TX 76458 | Oil Operator | Jun 2007 |
| 247 | Domestic Crude | Graham, TX 76450 | Oil & Gas Operator | Jul 2000 |
| 248 | Dominion Natural Resources LLC | Dallas, TX 75367 | Oil & Gas Operator | Apr 2025 |
| 249 | Don Bar Investment Company | Windthorst, TX 76389 | Oil & Gas Operator | Feb 2004 |
| 250 | Don Peterson Company, LLC - | Loving, TX 76460 | Oil Operator | Apr 2025 |
| 251 | Dooley, Jeff | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2012 |
| 252 | Double Eagle Exploration Inc | Windthorst, TX 76389 | Oil Operator | Dec 2024 |
| 253 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Apr 2025 |
| 254 | Double L Operating | Graham, TX 76450 | Oil & Gas Operator | Nov 2018 |
| 255 | Douglas Investments Inc | Fort Worth, TX 76137 | Oil Operator | Jan 2020 |
| 256 | Dove Drilling, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 1997 |
| 257 | Drennan, D. E. | Graham, TX 76450 | Oil & Gas Operator | Dec 2011 |
| 258 | Dry Creek Operating, LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Apr 2025 |
| 259 | Dry Fork Production Co., LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2025 |
| 260 | Dte Gas Resources, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2007 |
| 261 | Dte Gas Resources, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2014 |
| 262 | Dual Quiver Oil & Gas Op, LLC | Flower Mound, TX 75027 | Oil & Gas Operator | Apr 2025 |
| 263 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Apr 2025 |
| 264 | E & W Production | Olney, TX 76374 | Oil & Gas Operator | Aug 2018 |
| 265 | E-L Gas Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2001 |
| 266 | E.C. Hindman Oil And Gas | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 267 | Eagle Energy Acquisitions LP | Houston, TX 77002 | Oil & Gas Operator | Aug 2014 |
| 268 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2025 |
| 269 | Eagle Petroleum Corporation | Holliday, TX 76366 | Oil & Gas Operator | Oct 2005 |
| 270 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Apr 2025 |
| 271 | Eastland Oil Company, The | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 272 | Ec Stryker Inc | Decatur, TX 76234 | Oil & Gas Operator | Dec 2015 |
| 273 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 274 | Edco Energy, Inc. | Austin, TX 78738 | Oil & Gas Operator | May 2003 |
| 275 | Edmonds Management Company | Richardson, TX 75081 | Oil & Gas Operator | Mar 2015 |
| 276 | El Reno Energy, LLC | Granbury, TX 76048 | Oil & Gas Operator | Apr 2025 |
| 277 | Elson Oil Company | Tulsa, OK 74103-4429 | Oil & Gas Operator | Dec 2016 |
| 278 | Emco Oil & Gas | Graham, TX 76450 | Oil & Gas Operator | Dec 1995 |
| 279 | Emco Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2002 |
| 280 | Emerald Petroleum Corporation | Dallas, TX 75244 | Oil & Gas Operator | Apr 2002 |
| 281 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 282 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 283 | Enerfin Resources II-92 L.P. | Houston, TX 77077 | Oil & Gas Operator | Apr 2025 |
| 284 | Energy Transfer Crude Marketing LLC | Houston, TX 77002 | Oil Operator | Jan 2025 |
| 285 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 286 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Apr 2025 |
| 287 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2025 |
| 288 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 289 | Engas Corporation | Jacksboro, TX 76458 | Oil & Gas Operator | May 2008 |
| 290 | Enlo Energy Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2001 |
| 291 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 292 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 293 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 294 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 295 | Ericksen, W.R. | Hobbs, NM 88240 | Oil & Gas Operator | Nov 1993 |
| 296 | Ernmar Investments, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Apr 2025 |
| 297 | Erwin Oil Company | Jacksboro, TX 76458 | Oil Operator | Apr 2025 |
| 298 | Erwin Operating | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 299 | Erwin, James D. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1993 |
| 300 | Esg Resources LLC | Dallas, TX 75231 | Oil & Gas Operator | Apr 2025 |