| 201 | Dahl & Smith Oil Co | Barnsdall, OK 74002 | Oil & Gas Operator | Aug 1999 |
| 202 | Dahl Randall Lee | Barnsdall, OK 74002 | Oil Operator | Apr 2025 |
| 203 | Dahl SWD Facility #1 LLC | Oklahoma City, OK 73013 | Gas Operator | Dec 2017 |
| 204 | Dahlia Operating LLC | Petrolia, TX 76377 | Oil & Gas Operator | Apr 2018 |
| 205 | Dailey Oil And Gas LLC | | Oil & Gas Operator | Jun 2019 |
| 206 | Daily, Carroll | Loving, TX 76460 | Oil & Gas Operator | Sep 2023 |
| 207 | Dain Oil | Graham, TX 76450 | Oil & Gas Operator | Dec 2007 |
| 208 | Daisy Pointer | | Oil Operator | Jul 1999 |
| 209 | Dakar Operating Company | Pampa, TX 79066 | Oil & Gas Operator | Dec 2001 |
| 210 | Dakota Crude, Inc. | | Oil & Gas Operator | May 2025 |
| 211 | Dakota Drilling, LLC | Wichita, KS 67205 | Oil Operator | Feb 2006 |
| 212 | Dakota Exploration LLC | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2025 |
| 213 | Dakota Oil & Gas Co | Delmont, PA 15626-2408 | Oil & Gas Operator | Dec 2024 |
| 214 | Dakota Oil Company | Hebbronville, TX 78361 | Oil & Gas Operator | Jul 2025 |
| 215 | Dakota Opr Co Inc | Indiana, PA 15701-0444 | Oil & Gas Operator | Dec 1999 |
| 216 | Dakota Production Co., Inc. | Neodesha, KS 66757 | Gas Operator | Mar 2025 |
| 217 | Dakota Resources | | Oil & Gas Operator | Jan 1989 |
| 218 | Dakota Resources, Inc | Midland, TX 79707 | Oil & Gas Operator | Feb 2025 |
| 219 | Dakota Resources, Inc. (I) | Midland, TX 79707 | Oil & Gas Operator | Jul 2025 |
| 220 | Dakota West Pumping, Inc. | | Oil & Gas Operator | Feb 2004 |
| 221 | Dakota-3 E&P Company, LLC | | Oil & Gas Operator | Jan 2012 |
| 222 | Dal-Long Oil Company | | Oil Operator | Feb 2001 |
| 223 | Dalco Petroleum, Inc | | Oil & Gas Operator | Jan 2006 |
| 224 | Dalcor Energy LLC | Duncan, OK 73534 | Oil & Gas Operator | Apr 2025 |
| 225 | Dale E. Jackson Production Co. | | Oil Operator | Mar 2025 |
| 226 | Dale Expl Co & R. A. Campbell | | Oil Operator | Nov 1995 |
| 227 | Dale Exploration Company | | Oil & Gas Operator | May 2004 |
| 228 | Dale George | Elmore City, OK 73433 | Oil & Gas Operator | Aug 2022 |
| 229 | Dale Jimmy | Davis, OK 73030 | Oil & Gas Operator | Mar 2015 |
| 230 | Dale O. Reese | | Oil Operator | Nov 1989 |
| 231 | Dale O. Reese, Inc. | | Oil Operator | Jul 1997 |
| 232 | Dale Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 2025 |
| 233 | Dale Operations, LLC | Dickinson, TX 77539 | Oil & Gas Operator | Jul 2025 |
| 234 | Dale R & George W Magee | Duke Center, PA 16729-0217 | Oil & Gas Operator | Dec 2010 |
| 235 | Dale U & Martha E Livermore | Brookville, PA 15825-7524 | Gas Operator | Dec 2024 |
| 236 | Dale, David Dba DD Oil Company | Spencer, WV 25276-0406 | Oil & Gas Operator | Dec 2021 |
| 237 | Dale, Doyle C. | Poolville, TX 76487 | Oil & Gas Operator | Sep 2018 |
| 238 | Daleco Resources | | Gas Operator | Dec 2000 |
| 239 | Daleco Resources, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | Mar 2008 |
| 240 | Dalen Resources Oil & Gas | Dallas, TX 75206-3922 | Oil & Gas Operator | Jan 1996 |
| 241 | Dalen Resources Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 242 | Dales Oil Company | Loving, TX 76460 | Oil Operator | Jul 2025 |
| 243 | Dales Tank Truck Service Inc | Ratliff City, OK 73481 | Oil & Gas Operator | Apr 2025 |
| 244 | Dalf Energy LLC | Pampa, TX 79066 | Oil & Gas Operator | Jul 2025 |
| 245 | Dallas DRLG. & Development Co. | | Oil & Gas Operator | Apr 1987 |
| 246 | Dallas Energy LLC | Bradford, PA 16701 | Oil & Gas Operator | Dec 2024 |
| 247 | Dallas Operating Corp. | Dallas, TX 75205 | Oil & Gas Operator | Nov 2006 |
| 248 | Dallas Petroleum Group, LLC | Dallas, TX 75379 | Oil & Gas Operator | Jul 2025 |
| 249 | Dallas Production | Dallas, TX 75206 | Oil & Gas Operator | Sep 1996 |
| 250 | Dallas Production Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Jul 2025 |
| 251 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 252 | Dallas Resources, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Dec 1997 |
| 253 | Dallas Royalty, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2012 |
| 254 | Dally'S Oil Co. LLC | Monahans, TX 79756 | Oil Operator | Jul 2025 |
| 255 | Dalnor Corporation | | Oil & Gas Operator | Nov 2010 |
| 256 | Dalport Oil Corporation | Dallas, TX 75202 | Oil & Gas Operator | Apr 1993 |
| 257 | Dalton & Hanna LTD | Wooster, OH 44691 | Oil & Gas Operator | Dec 2018 |
| 258 | Dalton J. Woods | | Oil & Gas Operator | Dec 1985 |
| 259 | Damar Resc Incor | | Oil Operator | Oct 1995 |
| 260 | Damar Resources, Inc. | Hays, KS 67601 | Oil & Gas Operator | Oct 2023 |
| 261 | Dameron Petroleum Corp. | Midland, TX 79708 | Oil & Gas Operator | Jul 2025 |
| 262 | Damian Oil, Inc. | | Oil & Gas Operator | Dec 2024 |
| 263 | Damron Energy | Eden, TX 76837 | Oil & Gas Operator | Jan 2015 |
| 264 | Damron Energy, LLC | Eden, TX 76837 | Oil & Gas Operator | Jul 2025 |
| 265 | Damson Oil Corpo | | Oil & Gas Operator | May 1994 |
| 266 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 267 | Damson-Franks-McCord-Goodrich | | Oil & Gas Operator | Aug 1984 |
| 268 | Dan A. Hughes Company | | Oil & Gas Operator | Dec 2005 |
| 269 | Dan A. Hughes Company, L.P. | Beeville, TX 78104 | Oil & Gas Operator | Mar 2025 |
| 270 | Dan C Berry | Eunice, NM 88231 | Oil Operator | Oct 1995 |
| 271 | Dan Owens | | Oil & Gas Operator | Jul 1993 |
| 272 | Dan Strong Jr | Midland, TX 79702 | Oil & Gas Operator | Mar 1994 |
| 273 | Dan Texas Company | Waco, TX 76710 | Oil & Gas Operator | Sep 1998 |
| 274 | Dana Petroleum Inc | Salt Lake City, UT 84047 | Oil & Gas Operator | Nov 1998 |
| 275 | Dance Oil Company | Denver, CO 80202 | Oil & Gas Operator | May 1993 |
| 276 | Danco Enterprises Inc | Ada, OK 74820 | Oil Operator | Apr 2008 |
| 277 | Danco Oil & Gas | White Deer, TX 79097 | Oil & Gas Operator | Aug 2013 |
| 278 | Dane G. Hansen Trust | | Oil Operator | Dec 1994 |
| 279 | Danick Operating USA Inc | McKinney, TX 75072-9071 | Oil & Gas Operator | Oct 2022 |
| 280 | Daniel B. Robinett | | Oil & Gas Operator | Dec 1990 |
| 281 | Daniel Explorations Inc | Georgetown, TX 78627 | Oil & Gas Operator | Apr 2009 |
| 282 | Daniel Mineral Development, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2007 |
| 283 | Daniel Oil & Gas | Granbury, TX 76049 | Oil & Gas Operator | Oct 2010 |
| 284 | Daniel Oil Company | | Oil & Gas Operator | Jan 1983 |
| 285 | Daniel P Hornburg | Clarendon, PA 16313-2324 | Oil & Gas Operator | Dec 2024 |
| 286 | Daniel Resource Dev Inc | Tomball, TX 77375-8919 | Oil & Gas Operator | Oct 2009 |
| 287 | Daniel, Freeman | El Dorado, AR 71730 | Oil Operator | Dec 2024 |
| 288 | Daniel-Price Exploration Co | Tulsa, OK 74119 | Gas Operator | Apr 2011 |
| 289 | Daniels Corporation, The | Seabrook, TX 77586 | Oil & Gas Operator | Jul 2025 |
| 290 | Daniels Danny | Tishomingo, OK 73460-0853 | Oil Operator | Apr 2015 |
| 291 | Daniels E L Dril | | Oil Operator | Nov 1995 |
| 292 | Daniels Earlene Inc | Follett, TX 79034-9736 | Oil & Gas Operator | Mar 2015 |
| 293 | Daniels Energy | Pampa, TX 79066 | Oil & Gas Operator | Jul 2025 |
| 294 | Daniels Oil Co. | | Oil Operator | Mar 2025 |
| 295 | Daniels Petroleu | | Oil Operator | Jan 1991 |
| 296 | Daniels Petroleum Co | Denver, CO 80202 | Oil & Gas Operator | Mar 2003 |
| 297 | Daniels, C. W. | Stockdale, TX 78160 | Oil & Gas Operator | Dec 2009 |
| 298 | Daniels, Earlene | Follett, TX 79034 | Oil & Gas Operator | Feb 2002 |
| 299 | Daniels, J.C. Energy | Pampa, TX 79066 | Oil & Gas Operator | Apr 2001 |
| 300 | Dankbar, LLC | Kevin, MT 59454 | Oil Operator | May 2025 |