| 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 | Daisy Pointer | | Oil Operator | Jul 1999 |
| 204 | Dance Oil Company | Denver, CO 80202 | Oil & Gas Operator | May 1993 |
| 205 | David L Greene II LLC | | Oil Operator | Apr 2025 |
| 206 | Davis Bros. Oil Producers, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2020 |
| 207 | Davis Operating Company | Elysian Field, TX 75642 | Oil & Gas Operator | Jul 2025 |
| 208 | Davis/Osage Corp | Tulsa, OK 74103 | Oil Operator | Jan 2001 |
| 209 | Dawson, Levi S | | Oil & Gas Operator | Mar 2015 |
| 210 | DBS Oil Co /Osage Only | | Oil Operator | Apr 2025 |
| 211 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Apr 2025 |
| 212 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 213 | Dell Charles E | Cleveland, OK 74020-0090 | Oil & Gas Operator | Feb 2015 |
| 214 | Delong Ralph J | Sapulpa, OK 74066 | Oil & Gas Operator | Nov 2005 |
| 215 | Delong, Ralph S | | Oil & Gas Operator | Jul 2024 |
| 216 | Demier Oil Company | Tulsa, OK 74105-2128 | Oil & Gas Operator | Nov 2008 |
| 217 | Dennison George | Tulsa, OK 74112-6732 | Oil & Gas Operator | Apr 2020 |
| 218 | Des Oil Inc/Osage Only | | Oil Operator | Nov 1998 |
| 219 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 220 | Dewey Enterprises Inc | | Oil & Gas Operator | Apr 2025 |
| 221 | Dexxon, Inc. | Kiefer, OK 74041 | Oil & Gas Operator | Apr 2025 |
| 222 | Diamond E Oil Company LLC | | Oil Operator | Apr 2025 |
| 223 | Diehl Mark | | Oil Operator | Nov 1998 |
| 224 | Discovery Energy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2025 |
| 225 | Divide Petroleum Co | | Oil & Gas Operator | May 2000 |
| 226 | Dixon, Bucky | | Oil & Gas Operator | Aug 2016 |
| 227 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Jul 2025 |
| 228 | Domar Oil & Gas, Inc. | Liberal, KS 67905 | Oil & Gas Operator | Oct 2000 |
| 229 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 230 | Double G Oil LLC | | Oil Operator | Apr 2025 |
| 231 | Drummond Upstream LLC | Tulsa, OK 74104 | Oil & Gas Operator | Apr 2025 |
| 232 | Drummond, F F | | Oil Operator | Apr 2025 |
| 233 | Drumright Well Service Inc | Oilton, OK 74052 | Oil & Gas Operator | Jan 2025 |
| 234 | Duggan Stephen F | Boston, MA 2131 | Oil & Gas Operator | Jun 2010 |
| 235 | Dukes T F | | Oil & Gas Operator | Apr 2007 |
| 236 | Eagle Road Oil LLC | Tulsa, OK 74103-3312 | Oil & Gas Operator | Apr 2025 |
| 237 | Earl Oil Inc | Stillwater, OK 74074-1079 | Oil & Gas Operator | Mar 2025 |
| 238 | Earth Oil Inc | Skiatook, OK 74070-0578 | Oil & Gas Operator | Oct 2008 |
| 239 | Ecc Energy Corporation | Dewey, OK 74029 | Oil & Gas Operator | Feb 2020 |
| 240 | Eclipse Production Co | | Oil Operator | Nov 2005 |
| 241 | Eddings, Steve L | | Oil & Gas Operator | Jul 2022 |
| 242 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 243 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | May 2025 |
| 244 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Apr 2025 |
| 245 | Elmore Stanley G | Bartlesville, OK 74006-1741 | Oil & Gas Operator | Sep 2023 |
| 246 | Emerson Oil Company | Rindge, NH 03461 | Oil & Gas Operator | Feb 2008 |
| 247 | Emery Edward A | Tulsa, OK 74145-7921 | Oil Operator | Apr 2025 |
| 248 | Endicott Melvin F | Ponca City, OK 74601 | Oil & Gas Operator | Apr 2001 |
| 249 | Enerco Energy Corporation | Norman, OK 73069-6643 | Oil & Gas Operator | Apr 2020 |
| 250 | Energas Corporation | Oklahoma City, OK 73105 | Oil & Gas Operator | Feb 2025 |
| 251 | Energy Lease Service Inc | Drumright, OK 74030-7403 | Oil & Gas Operator | May 2025 |
| 252 | Ensight Energy Group Inc | Richardson, TX 75080-2370 | Oil & Gas Operator | Apr 2025 |
| 253 | Ensource Inc | Midland, TX 79705 | Oil & Gas Operator | Aug 1998 |
| 254 | Eott Energy Operating LP | Houston, TX 77210-4666 | Oil & Gas Operator | Oct 2009 |
| 255 | Epperson John R | Bartlesville, OK 74003 | Oil Operator | Aug 1999 |
| 256 | Equinox Oil Company | Plainville, KS 67663 | Oil & Gas Operator | Dec 2019 |
| 257 | Equity Drilling Company Inc | Dewey, OK 74029 | Oil & Gas Operator | Nov 1998 |
| 258 | Erwin, Sanford P | | Oil & Gas Operator | Apr 2019 |
| 259 | Esco Exploration, Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 260 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 261 | Ew Carter Oil Co;Inc | | Oil & Gas Operator | Apr 2025 |
| 262 | Eyler Corporation | | Oil & Gas Operator | Nov 2012 |
| 263 | Eyler Dean E | Cleveland, OK 74020 | Oil & Gas Operator | May 2025 |
| 264 | F & G Management LLC | Claremore, OK 74019-0392 | Oil Operator | Apr 2025 |
| 265 | F & J Oil Company, L.L.C. | | Oil Operator | May 2025 |
| 266 | F & M Oil Company Inc | Pettus, TX 78146 | Oil & Gas Operator | Jul 2025 |
| 267 | Far West Development, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jul 2025 |
| 268 | Farmland Industries Inc | Kansas City, MO 64195-0111 | Oil & Gas Operator | Nov 1995 |
| 269 | Federal Energy Development Co. | Dallas, TX 75205 | Oil & Gas Operator | Mar 2011 |
| 270 | Fell Oil And Gas Inc | Tulsa, OK 74157-9487 | Oil & Gas Operator | Aug 2016 |
| 271 | Fieldstone Exploration Company | | Oil & Gas Operator | Jan 2007 |
| 272 | Fine Jack | Pensacola, FL 32516 | Oil Operator | May 1995 |
| 273 | Flatrock Energy Co | | Oil & Gas Operator | May 2017 |
| 274 | Forrest, Catherine M | | Oil & Gas Operator | Apr 2025 |
| 275 | Four Brothers Inc | | Oil & Gas Operator | Jan 2020 |
| 276 | Fox Jr Jimmy D | Bartlesville, OK 74003 | Oil & Gas Operator | Nov 2005 |
| 277 | Fox Northeastern Oil & Gas Corp | Bartlesville, OK 74003-2226 | Oil & Gas Operator | May 2025 |
| 278 | Frisco Energy, L.L.C. | Tulsa, OK 74105 | Oil & Gas Operator | May 2025 |
| 279 | Future Energy Partners | Bartlesville, OK 74005 | Oil & Gas Operator | Feb 2017 |
| 280 | Galaxy Corporation (The) | Sapulpa, OK 74066 | Oil & Gas Operator | May 2025 |
| 281 | Galt Investment Company LLC | Tulsa, OK 74120-7412 | Oil Operator | Jun 2024 |
| 282 | Gary Hurd Oil Company, Inc. | | Oil & Gas Operator | Apr 2025 |
| 283 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 284 | Geological & Engineering Consultants | | Oil & Gas Operator | Apr 2025 |
| 285 | Gilliland Gerald D | Dewey, OK 74029-1639 | Oil Operator | Mar 2015 |
| 286 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2025 |
| 287 | Glenn, Hoyt | | Oil Operator | Nov 2014 |
| 288 | Global Oklahoma Production, L.L.C. | | Oil & Gas Operator | May 2024 |
| 289 | Golden Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 290 | Golden West Energy LTD | | Oil & Gas Operator | Apr 2020 |
| 291 | Gopher Oil Company | | Oil & Gas Operator | Mar 2025 |
| 292 | Gore Sidney | Tulsa, OK 74101 | Oil & Gas Operator | Dec 2016 |
| 293 | Grace Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Oct 2011 |
| 294 | Graham, Marion T | | Oil Operator | Apr 2025 |
| 295 | Gram Oil Co | Bartlesville, OK 74003 | Oil Operator | Dec 2011 |
| 296 | Grand Production Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Aug 2000 |
| 297 | Grand Resources Inc | Tulsa, OK 74137 | Oil & Gas Operator | Jul 2025 |
| 298 | Graves J M | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2007 |
| 299 | Graves John G Oil Prop Inc | Tulsa, OK 74116-5666 | Oil & Gas Operator | Feb 2001 |
| 300 | Gray Fox Operating Company | Tulsa, OK 74119 | Oil Operator | May 1993 |