| 8201 | Doco Development Corporation | Norman, OK 73072 | Oil & Gas Operator | Jun 2025 |
| 8202 | Dodd Oil & Gas | Spencer, WV 25276 | Oil & Gas Operator | Dec 2021 |
| 8203 | Dodd, C. C., Oil & Gas | | Oil & Gas Operator | Dec 2021 |
| 8204 | Dodson Prairie Oil & Gas LLC | San Antonio, TX 78205 | Gas Operator | Oct 2025 |
| 8205 | Dodson, Inc. | San Antonio, TX 78232 | Oil & Gas Operator | Oct 1998 |
| 8206 | Dodson, Wayne Consultants, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Jul 2003 |
| 8207 | Doege, Donald | La Vernia, TX 78121 | Oil & Gas Operator | Oct 2025 |
| 8208 | Doege, Harry | La Vernia, TX 78121 | Oil & Gas Operator | Aug 2003 |
| 8209 | Doggy Oil Corp | Decatur, GA 30031 | Oil & Gas Operator | Oct 2025 |
| 8210 | Dogwood Operating Company, Inc. | Houston, TX 77069 | Oil & Gas Operator | Oct 2025 |
| 8211 | Dol Resources Inc | Rowlett, TX 75088 | Oil & Gas Operator | Aug 2025 |
| 8212 | Dolberry Energy Resources Corp. | Dallas, TX 75252 | Oil Operator | Oct 2025 |
| 8213 | Dolch Production, Inc. | San Antonio, TX 78248 | Oil & Gas Operator | Jul 1996 |
| 8214 | Dole Enterprises Inc. | | Oil & Gas Operator | Aug 2025 |
| 8215 | Dolezal George Jr | Littleton, CO 80163 | Oil & Gas Operator | Sep 2006 |
| 8216 | Dolinar, Michael J. | Angola, NY 14006 | Gas Operator | Dec 2024 |
| 8217 | Dolphin Energy LLC | Lake Worth, FL 33467 | Oil & Gas Operator | Jun 2025 |
| 8218 | Dolphin Petroleum | Alice, TX 78333 | Oil & Gas Operator | Jun 2008 |
| 8219 | Dolphin Petroleum, LP | Alice, TX 78333 | Oil & Gas Operator | Oct 2025 |
| 8220 | Domac Oil Company Inc | Perkins, OK 74059-0642 | Oil & Gas Operator | Feb 2006 |
| 8221 | Domar Oil & Gas | | Gas Operator | May 1995 |
| 8222 | Domar Oil & Gas, Inc. | Liberal, KS 67905 | Oil & Gas Operator | Oct 2000 |
| 8223 | Dome De Sel LLC | | Oil & Gas Operator | Nov 2024 |
| 8224 | Dome Drilling Co | Westlake, OH 44145-1964 | Oil & Gas Operator | Dec 2009 |
| 8225 | Dome Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 8226 | Dome Producing | Cleveland, OH 44114 | Oil & Gas Operator | Dec 1988 |
| 8227 | Domestic Crude | Graham, TX 76450 | Oil & Gas Operator | Jul 2000 |
| 8228 | Domestic Energy Corporation | | Oil Operator | Jan 1988 |
| 8229 | Domestic Oil & Gas Co | Bedford, OH 44146 | Oil & Gas Operator | Dec 1990 |
| 8230 | Domestic Oil Producers | | Oil Operator | Oct 1980 |
| 8231 | Domestic Oil Producers,Inc. | | Oil Operator | Oct 1998 |
| 8232 | Domestic Oil Production | | Oil & Gas Operator | Oct 1989 |
| 8233 | Dominguez Energy L.P. | | Oil & Gas Operator | Dec 2000 |
| 8234 | Dominguez Properties | | Oil & Gas Operator | Dec 1991 |
| 8235 | Dominion Corporation | Houston, TX 77001 | Oil & Gas Operator | Dec 2010 |
| 8236 | Dominion East Ohio | North Canton, OH 44720 | Oil & Gas Operator | Dec 2023 |
| 8237 | Dominion Energy Transmission, Inc. | | Oil & Gas Operator | Dec 2019 |
| 8238 | Dominion Exp Midcontinent Inc | Oklahoma City, OK 73134-2616 | Oil & Gas Operator | Oct 2024 |
| 8239 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 8240 | Dominion Field Services Inc | Richmond, VA 23219 | Oil & Gas Operator | Dec 2013 |
| 8241 | Dominion Midstream Services, LP | | Oil Operator | Dec 2006 |
| 8242 | Dominion Midwest Energy Inc | | Oil & Gas Operator | Dec 2007 |
| 8243 | Dominion Minerals Corporation | Houston, TX 77014 | Oil & Gas Operator | Nov 2009 |
| 8244 | Dominion Natural Resources LLC | Dallas, TX 75367 | Oil & Gas Operator | Oct 2025 |
| 8245 | Dominion Oil & Gas Corporation | Irving, TX 75039 | Oil & Gas Operator | Jun 2012 |
| 8246 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 8247 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 8248 | Dominion Oklahoma Texas Expl & Prod Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Aug 2013 |
| 8249 | Dominion Oklahoma Texas Exploration & Production | Houston, TX 77060 | Oil & Gas Operator | Dec 2006 |
| 8250 | Dominion Operating, LLC | Midland, TX 79708 | Oil Operator | Mar 2018 |
| 8251 | Dominion Production Company, LLC | Tampa, FL 33606 | Oil & Gas Operator | Oct 2025 |
| 8252 | Dominion Resources, Inc | Staffordsville, KY 41256 | Oil & Gas Operator | Dec 2014 |
| 8253 | Dominiq Operating, Inc | Scurry, TX 75158 | Oil Operator | Dec 2023 |
| 8254 | Domino Operations, Inc. | Abilene, TX 79603 | Oil & Gas Operator | Oct 2025 |
| 8255 | Domino Prod Services Inc | Bellville, TX 77418 | Oil & Gas Operator | Feb 2004 |
| 8256 | Dominus Energy, Inc | Austin, TX 78737 | Oil & Gas Operator | Dec 2020 |
| 8257 | Dominy Oil Co., Inc. | Fort Worth, TX 76185 | Oil & Gas Operator | Oct 1999 |
| 8258 | Don Bar Investment Company | Windthorst, TX 76389 | Oil & Gas Operator | Feb 2004 |
| 8259 | Don Byers Oil & Gas LLC | Heath, OH 43056 | Oil & Gas Operator | Dec 2024 |
| 8260 | Don Erbert Oil Company | | Oil Operator | Oct 2013 |
| 8261 | Don G. Wiley, Jr. | | Oil Operator | Dec 1979 |
| 8262 | Don Karst Well Service, Inc. | Russell, KS 67665 | Oil Operator | May 2025 |
| 8263 | Don Peterson Company, LLC - | Loving, TX 76460 | Oil Operator | Oct 2025 |
| 8264 | Don R Ormand | Midland, TX 79702 | Oil & Gas Operator | Jun 2014 |
| 8265 | Don Sims Oil | | Oil Operator | Jun 2025 |
| 8266 | Don Townes | | Oil Operator | Sep 2000 |
| 8267 | Don W. Holcomb | | Oil Operator | Feb 1996 |
| 8268 | Don Webb | | Oil Operator | Mar 1984 |
| 8269 | Don Yohe Enterprises And Devonian Energy Inc | | Gas Operator | Dec 1999 |
| 8270 | Don Yohe Enterprises Inc. | Armada, MI 48005 | Oil & Gas Operator | Apr 2018 |
| 8271 | Don'S Oil Company Inc | Oxford, KS 67119-0006 | Oil Operator | Apr 2011 |
| 8272 | Don-Dale, Inc. | Clarksville, TX 75426 | Oil & Gas Operator | Aug 2003 |
| 8273 | Donahue Pipeline Construction, Inc. | Branchland, WV 25506 | Gas Operator | Dec 2021 |
| 8274 | Donaker Alan M | Warsaw, OH 43844 | Oil & Gas Operator | Dec 1994 |
| 8275 | Donald & Danny Dews Production | | Oil Operator | Jan 2025 |
| 8276 | Donald C Slawson Expl Co. Inc | | Oil & Gas Operator | Dec 2020 |
| 8277 | Donald C. Ring Revocable Trust | Sebring, FL 33875 | Gas Operator | Dec 2024 |
| 8278 | Donald C. Slawson | | Oil Operator | Jun 1985 |
| 8279 | Donald E & Janet L Rearick | Ford City, PA 16226-9801 | Gas Operator | Dec 2024 |
| 8280 | Donald J. Zadeck | | Oil & Gas Operator | Feb 1998 |
| 8281 | Donald Len Barreth | | Oil & Gas Operator | Dec 1991 |
| 8282 | Donald Owens | | Oil & Gas Operator | Dec 2024 |
| 8283 | Donaldson Richard E | Bartlesville, OK 74005-0032 | Oil & Gas Operator | Nov 2005 |
| 8284 | Donalu Oil | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |
| 8285 | Doneghy James | Wellington, TX 79095 | Oil & Gas Operator | May 2013 |
| 8286 | Donke Oil & Gas, LLC | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2018 |
| 8287 | Donn G. Thompson, Et Al | | Oil Operator | Apr 1987 |
| 8288 | Donna Lee Oil Co | Independence, KS 67301 | Oil & Gas Operator | Apr 2014 |
| 8289 | Donna-Lynne Oil Co. | George West, TX 78022 | Oil & Gas Operator | Jun 2018 |
| 8290 | Donnell Pipe & Supply Co/TX Corp | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2008 |
| 8291 | Donnell, Bill | Graham, TX 76450 | Oil & Gas Operator | May 1995 |
| 8292 | Donnell, Louis, Jr. | South Bend, TX 76481 | Oil & Gas Operator | Mar 2008 |
| 8293 | Donnelly Casing Pulling Co | | Oil Operator | Aug 2020 |
| 8294 | Donnie R. Morrow | | Oil Operator | Dec 2024 |
| 8295 | Donny Joe Barnhill | | Gas Operator | Dec 2024 |
| 8296 | Donoco Oil Company | La Vernia, TX 78121 | Oil & Gas Operator | Oct 2025 |
| 8297 | Donovan Joe D Or L P McElwaine | Tulsa, OK 74119 | Gas Operator | Jan 2014 |
| 8298 | Donray Petroleum LLC | Choctaw, OK 73020 | Oil & Gas Operator | Jun 2025 |
| 8299 | Donson Corporation | Edmond, OK 73083-0341 | Oil & Gas Operator | Jul 1997 |
| 8300 | Doodlebug Oil Co | | Oil Operator | Jun 2006 |