| 8301 | Doran & Associates | Pittsburgh, PA 15220 | Oil & Gas Operator | Dec 1988 |
| 8302 | Doran & Braddock & Nelson Petr | | Oil Operator | Feb 1982 |
| 8303 | Doran And Braddock | | Oil & Gas Operator | Nov 1984 |
| 8304 | Dorbert Oil & Gas, Inc. | | Gas Operator | Aug 1988 |
| 8305 | Dorcheat Oil & Gas, LLC | | Oil & Gas Operator | Dec 2024 |
| 8306 | Dorchester Exploration, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 2001 |
| 8307 | Dorchester Hugot | | Gas Operator | Sep 1993 |
| 8308 | Dorchester Hugoton LTD | Garland, TX 75042-8212 | Oil & Gas Operator | Mar 2004 |
| 8309 | Dorchester Minerals Operating LP | Dallas, TX 75219 | Oil & Gas Operator | Jun 2022 |
| 8310 | Dorchester Operating Company LLC | Refugio, TX 78377 | Oil & Gas Operator | Jul 2025 |
| 8311 | Dore Corporation | Amarillo, TX 79119 | Gas Operator | Jun 2010 |
| 8312 | Dore Energy Co., LTD. | Amarillo, TX 79101 | Gas Operator | Jul 2025 |
| 8313 | Dore-Dyn Production Co., Inc. | | Oil & Gas Operator | Jul 1993 |
| 8314 | Dorey Oil Corporation | Healdton, OK 73438-0856 | Oil Operator | Apr 2014 |
| 8315 | Dorfman Production Company | Beloit, OH 44609 | Oil & Gas Operator | Jul 2025 |
| 8316 | Dorfs Drilling Company | Waurika, OK 73573 | Oil & Gas Operator | Nov 2024 |
| 8317 | Dorland, D. L. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 8318 | Dorland, D. L. Estate Of | Midland, TX 79702 | Oil & Gas Operator | Nov 1994 |
| 8319 | Dorland, D. L. Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 1994 |
| 8320 | Dorondoco Operating Co., Inc. | Brownwood, TX 76801 | Oil & Gas Operator | May 1994 |
| 8321 | Dorothy Boyce | Artesia, NM 88210 | Oil & Gas Operator | Sep 2000 |
| 8322 | Dorothy F. Hamlin | | Oil Operator | Dec 1985 |
| 8323 | Dorothy Oil Company | | Oil & Gas Operator | Oct 1994 |
| 8324 | Dorough, Lee Operations | Orlando, FL 32801 | Oil & Gas Operator | Jul 2025 |
| 8325 | Dorr, John R. | Pecos, TX 79772 | Oil & Gas Operator | Jul 2025 |
| 8326 | Dorsey Oil & Gas LLC | Nashport, OH 43830 | Oil & Gas Operator | Dec 2024 |
| 8327 | Dorso Energy | Wexford, PA 15090 | Oil & Gas Operator | Dec 2004 |
| 8328 | Dorso LLC | Wexford, PA 15090-8758 | Oil & Gas Operator | Dec 2005 |
| 8329 | Dorso LP | Wexford, PA 15090-8314 | Oil & Gas Operator | Dec 2024 |
| 8330 | Dorward Energy Corporation | Saint Petersburg, FL 33701-3255 | Oil & Gas Operator | Dec 2024 |
| 8331 | Dos Cicadas | Miles, TX 76861 | Oil & Gas Operator | Jul 2025 |
| 8332 | Dos Lobos Oil Co. | | Oil Operator | Dec 1999 |
| 8333 | Dos Rios Inc. | | Gas Operator | Jun 2025 |
| 8334 | Dossie Dews | | Oil & Gas Operator | Dec 2024 |
| 8335 | Dotson Floyd | | Oil Operator | Dec 1980 |
| 8336 | Dotson Jack M Operating Co | Norman, OK 73072-6649 | Oil Operator | Oct 1993 |
| 8337 | Dotson, Robert M | | Oil Operator | Dec 2020 |
| 8338 | Doty, Tim | Sedan, KS 67361 | Oil Operator | Dec 2009 |
| 8339 | Double "C" Energy | Coweta, OK 74429 | Oil & Gas Operator | Mar 2015 |
| 8340 | Double "D" Oil Company, Inc. | Winfield, KS 67156 | Oil Operator | Mar 2025 |
| 8341 | Double "K" Oil, Inc. | Ellis, KS 67637 | Oil Operator | Dec 2019 |
| 8342 | Double 'B' Oil Co | | Oil Operator | Nov 2009 |
| 8343 | Double 'B' Oil I | | Oil Operator | Feb 1992 |
| 8344 | Double 'E' Oil-B | | Oil Operator | Mar 1989 |
| 8345 | Double Aa Oil, L.L.C. | | Oil Operator | Aug 2023 |
| 8346 | Double Aa S LLC | Mayport, PA 16240-5638 | Oil & Gas Operator | Dec 2019 |
| 8347 | Double Barrel Oil Co. | | Oil Operator | Dec 1978 |
| 8348 | Double Barrel Oil LLC | Brenham, TX 77834 | Oil & Gas Operator | Jul 2025 |
| 8349 | Double Barrel Operating Limited Liability Company | Wichita Falls, TX 76308 | Oil Operator | Jul 2025 |
| 8350 | Double C Oil & Gas LLC | Jenks, OK 74037-6946 | Oil Operator | Feb 2025 |
| 8351 | Double C Operating LLC | Abilene, TX 79602 | Oil Operator | Jul 2025 |
| 8352 | Double D Producers, Inc | Edmonton, KY 42129 | Oil Operator | Dec 2023 |
| 8353 | Double D'S LLC | Hays, KS 67601 | Oil Operator | Mar 2025 |
| 8354 | Double Diamond Energy Corp. | Granbury, TX 76048 | Gas Operator | Apr 2013 |
| 8355 | Double Diamond Petroleum, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 8356 | Double E Oil & Gas, L. P. | Electra, TX 76360 | Oil & Gas Operator | Jul 2025 |
| 8357 | Double Eagle Exp | | Oil Operator | Jul 1992 |
| 8358 | Double Eagle Exploration Inc | Windthorst, TX 76389 | Oil Operator | Mar 2025 |
| 8359 | Double Eagle Oil & Gas Inc | Enid, OK 73702 | Oil & Gas Operator | Jan 2000 |
| 8360 | Double Eagle Oil Co. | Marshall, TX 75670 | Oil & Gas Operator | Jan 2002 |
| 8361 | Double Eagle Operating, LLC | Fort Worth, TX 76113 | Oil & Gas Operator | Jul 2025 |
| 8362 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Jul 2025 |
| 8363 | Double Eagle Resources, LLC | FT Smith, AR 72901 | Oil & Gas Operator | Sep 2009 |
| 8364 | Double Eight Oil Company LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Jul 2025 |
| 8365 | Double F Oil Co. | | Oil Operator | Jun 2009 |
| 8366 | Double G Oil LLC | | Oil Operator | Apr 2025 |
| 8367 | Double G Petro LLC | | Oil Operator | Mar 2025 |
| 8368 | Double H Petroleum Corporation | Tulsa, OK 74136-5414 | Oil & Gas Operator | May 2006 |
| 8369 | Double J Enterprises | Loving, TX 76460 | Oil Operator | Jul 2025 |
| 8370 | Double J Oil Co LLC | Bristow, OK 74010 | Oil & Gas Operator | May 2025 |
| 8371 | Double J Operating Company, Inc. | San Antonio, TX 78205 | Oil Operator | Jan 2008 |
| 8372 | Double J Resources Inc | Bradford, PA 16701-6506 | Oil & Gas Operator | Dec 2022 |
| 8373 | Double K Production | Graham, TX 76450 | Oil & Gas Operator | Sep 2014 |
| 8374 | Double L Contractors, LLC | Carthage, TX 75633 | Oil Operator | Jul 2025 |
| 8375 | Double L Drilling | Yates Center, KS 66783 | Oil Operator | Jun 2000 |
| 8376 | Double L Oil Producers | | Oil Operator | Dec 2019 |
| 8377 | Double L Operating | Graham, TX 76450 | Oil & Gas Operator | Nov 2018 |
| 8378 | Double M Petroproperties, Inc. | Haskell, TX 79521 | Oil & Gas Operator | Jul 2025 |
| 8379 | Double Play Oil & Gas | Portland, TX 78374 | Oil & Gas Operator | Dec 2001 |
| 8380 | Double Play Oil & Gas, Inc | Portland, TX 78374 | Oil & Gas Operator | Jul 2025 |
| 8381 | Double R Oil Co. | Charlotte, TX 78011 | Oil & Gas Operator | May 2010 |
| 8382 | Double R Petroleum | | Oil & Gas Operator | Sep 2004 |
| 8383 | Double S Liberty Energy, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 8384 | Double S Operating Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 8385 | Double T Energy LLC | Lenorah, TX 79749 | Oil Operator | Jul 2025 |
| 8386 | Double Ten Petro | | Oil Operator | Jul 1994 |
| 8387 | Double U Oil Co. | San Antonio, TX 78217 | Oil & Gas Operator | Feb 1996 |
| 8388 | Double U Oil Co., LTD. | San Antonio, TX 78217 | Oil & Gas Operator | May 2000 |
| 8389 | Doudna, Mark A. | Osawatomie, KS 66064 | Oil Operator | Nov 2009 |
| 8390 | Doug'S Pumping Service | | Oil Operator | Mar 2025 |
| 8391 | Dougherty Properties | Beeville, TX 78104 | Oil & Gas Operator | Jun 1997 |
| 8392 | Dougherty, H W | Petaluma, CA 94954 | Gas Operator | Oct 2019 |
| 8393 | Doughtie Operating Company, LLC | MC Queeney, TX 78123 | Oil & Gas Operator | Mar 2023 |
| 8394 | Douglas Edwards | | Oil Operator | Nov 1993 |
| 8395 | Douglas Fairbanks Holdings LLC | Pine Hurst, TX 77362-9998 | Oil & Gas Operator | Apr 2025 |
| 8396 | Douglas Investments Inc | Fort Worth, TX 76137 | Oil Operator | Jan 2020 |
| 8397 | Douglas Oil & Gas Co Inc | Ada, OK 74820 | Oil Operator | Apr 2014 |
| 8398 | Douglas Oil & Gas Inc | Canonsburg, PA 15317 | Gas Operator | Dec 2003 |
| 8399 | Douglas Oil & Gas LP | State College, PA 16803 | Oil & Gas Operator | Dec 2007 |
| 8400 | Douglas Petroleum Inc. | Spring, TX 77379 | Oil & Gas Operator | Nov 2010 |