| 8401 | Duink, Darryl | Hamburg, NY 14075 | Gas Operator | Dec 2025 |
| 8402 | Duke Drilling Co | Wichita, KS 67202 | Oil & Gas Operator | Feb 2006 |
| 8403 | Duke Energy Field Services Inc | | Oil Operator | Mar 2000 |
| 8404 | Duke Energy Field Services LLC | | Oil Operator | Dec 2006 |
| 8405 | Duke Gas Company LLC | | Oil & Gas Operator | May 2026 |
| 8406 | Duke Oil & Gas Company, LLC | Wellsville, KS 66092 | Oil Operator | May 2026 |
| 8407 | Duke Oil & Gas Inc | Colorado City, TX 79512 | Oil & Gas Operator | May 2003 |
| 8408 | Duke Oil LLC | Garnett, KS 66032 | Oil Operator | May 2026 |
| 8409 | Duke Operating Company | Graham, TX 76450 | Oil Operator | Sep 2026 |
| 8410 | Duke, M. L. | Snyder, TX 79549 | Oil & Gas Operator | Mar 2008 |
| 8411 | Duke, M.A. "Andy", Jr. | Montague, TX 76251 | Oil & Gas Operator | Jun 2023 |
| 8412 | Dukes T F | | Oil & Gas Operator | Apr 2007 |
| 8413 | Dula Production, LLC | Stockdale, TX 78160 | Oil Operator | Sep 2026 |
| 8414 | Dunamis Energy Operating LLC | | Oil & Gas Operator | Apr 2026 |
| 8415 | Dunbar & Son Oil | | Oil & Gas Operator | Oct 1988 |
| 8416 | Dunbar, Ron, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2012 |
| 8417 | Duncan Drilling Co. | Big Spring, TX 79721 | Oil & Gas Operator | Sep 2026 |
| 8418 | Duncan Energy Company | Denver, CO 80202 | Oil & Gas Operator | Mar 2008 |
| 8419 | Duncan Energy Companyuncan Energy Company | Denver, CO 80210 | Oil & Gas Operator | Jun 1995 |
| 8420 | Duncan Energy LLC | Dallas, TX 75231 | Oil & Gas Operator | Sep 2026 |
| 8421 | Duncan Jr J Walter | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2016 |
| 8422 | Duncan Land & Exploration, Inc. | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 8423 | Duncan Oil & Gas Inc | Norman, OK 73072 | Oil & Gas Operator | Sep 2020 |
| 8424 | Duncan Oil Company | Holliday, TX 76366 | Oil Operator | Mar 2008 |
| 8425 | Duncan Oil Inc | Denver, CO 80210 | Oil & Gas Operator | Jun 2016 |
| 8426 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2026 |
| 8427 | Duncan Ronald R | Okemah, OK 74859-9603 | Oil & Gas Operator | Aug 2023 |
| 8428 | Duncan, Gene L Dba Duncan Oil Co | Salem, IL 62881 | Oil Operator | Dec 2018 |
| 8429 | Duncan, Raymond T | Denver, CO 80210 | Oil & Gas Operator | Feb 1996 |
| 8430 | Duncan-Taylor & Schumacher | | Oil & Gas Operator | Nov 1987 |
| 8431 | Dundee Oil & Supply Inc | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2001 |
| 8432 | Dundee Petroleum, Inc. | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 2003 |
| 8433 | Dune Oil And Gas, Inc. | Odessa, TX 79768 | Oil & Gas Operator | Aug 2006 |
| 8434 | Dune Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 2016 |
| 8435 | Dune Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 1997 |
| 8436 | Dune Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jan 1993 |
| 8437 | Dunham'S Oil, LLC | Eureka, KS 67045 | Oil Operator | May 2026 |
| 8438 | Dunhill Expl. & Prod., LLC | | Oil & Gas Operator | Nov 2004 |
| 8439 | Dunhill Resources, Inc. | | Oil & Gas Operator | Nov 2005 |
| 8440 | Dunigan Operating Company, Inc. | Austin, TX 78755 | Oil & Gas Operator | Sep 2026 |
| 8441 | Dunigan Petroleum, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 8442 | Dunkin Oil And Gas LLC | Wynewood, OK 73098-9196 | Oil Operator | Apr 2026 |
| 8443 | Dunkirk City School District | Dunkirk, NY 14048 | Gas Operator | Dec 2025 |
| 8444 | Dunlap Drilling And Producing, Inc | Glenpool, OK 74033-4206 | Oil & Gas Operator | Jun 2026 |
| 8445 | Dunlap Exploration, Inc. | Fort Worth, TX 76101 | Oil & Gas Operator | Nov 2016 |
| 8446 | Dunlap Oil Company | Bristow, OK 74010 | Oil & Gas Operator | Jun 2026 |
| 8447 | Dunlap Well Service Inc | Haskell, OK 74436 | Oil & Gas Operator | Sep 1993 |
| 8448 | Dunlap, Rodge | Olney, TX 76374 | Oil & Gas Operator | Aug 2002 |
| 8449 | Dunn Energy LLC | Skiatook, OK 74070-4046 | Oil Operator | Sep 2022 |
| 8450 | Dunn Exploration Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 8451 | Dunn Joseph L | | Oil & Gas Operator | Dec 2025 |
| 8452 | Dunn Resources, LLC | Shreveport, LA 71115 | Oil & Gas Operator | Mar 2023 |
| 8453 | Dunn'S Oil And Gas Lease Management LLC | Ardmore, OK 73401 | Oil & Gas Operator | Jun 2026 |
| 8454 | Dunne Equities I | | Oil & Gas Operator | Dec 1995 |
| 8455 | Dunne Equities Operating, Inc. | Houston, TX 77057 | Oil & Gas Operator | Aug 2022 |
| 8456 | Dunne Equities, Inc. | Wichita, KS 67226 | Oil & Gas Operator | Apr 2014 |
| 8457 | Dunne Investments Operating, Inc. | Wichita, KS 67226 | Oil Operator | Mar 2002 |
| 8458 | Dunne Oil Co. | Wichita, KS 67202 | Oil Operator | Apr 1999 |
| 8459 | Dunne-Gardner Pe | | Oil & Gas Operator | Nov 1992 |
| 8460 | Dunne-Gardner Petroleum, Inc. | Wichita, KS 67202 | Gas Operator | Jun 2022 |
| 8461 | Dunnewold Farms LLC | Clymer, NY 14724 | Gas Operator | Dec 2025 |
| 8462 | Dunsmoor, David E. | Grand Junction, CO 81504 | Oil Operator | Jul 1998 |
| 8463 | Dupke Roger Oil Co Inc | Reno, OH 45773 | Oil & Gas Operator | Dec 2004 |
| 8464 | Duplantis Energy, LLC | Pleasanton, TX 78064 | Oil Operator | Sep 2026 |
| 8465 | Dupont Oil Company | | Oil Operator | Feb 1998 |
| 8466 | Dupree And Dupree | | Oil Operator | Dec 1998 |
| 8467 | Durango Energy Inc | Chickasha, OK 73023 | Oil Operator | Dec 1999 |
| 8468 | Durango Exploration LLC | Oklahoma City, OK 73120-5309 | Oil & Gas Operator | Jul 2026 |
| 8469 | Durango Operating Co., Inc. | Abilene, TX 79604 | Oil & Gas Operator | Feb 2002 |
| 8470 | Durango Operating LLC | Madison, MS 39110 | Oil & Gas Operator | Jun 2026 |
| 8471 | Durango Resources Corp. | Houston, TX 77043 | Oil & Gas Operator | Sep 2026 |
| 8472 | Durbin, Ronald R. | Moline, KS 67353 | Oil Operator | Dec 1988 |
| 8473 | Durham, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2016 |
| 8474 | Duroc Exploration LLC | Bixby, OK 74008 | Oil & Gas Operator | Jun 2026 |
| 8475 | Durossette Bill D | Haskell, OK 74436-1350 | Oil & Gas Operator | Jul 2004 |
| 8476 | Durossette Floyd R | Warner, OK 74469-0548 | Oil & Gas Operator | Apr 2011 |
| 8477 | Durossette Jr Jess | Haskell, OK 74436 | Oil Operator | Mar 2007 |
| 8478 | Durst Oil & Gas, Inc. | Point Pleasant, WV 25550 | Oil & Gas Operator | Dec 2021 |
| 8479 | Durst Oil Company | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Sep 2000 |
| 8480 | Dust Bowl Oil Company, Inc. | Spencerport, NY 14559 | Oil Operator | Dec 2025 |
| 8481 | Duster Production, Inc. | Refugio, TX 78377 | Oil & Gas Operator | Oct 2011 |
| 8482 | Dustin Energy Inc | Warren, OH 44481 | Oil & Gas Operator | Dec 2025 |
| 8483 | Dustin Enterprise | Olathe, KS 66062 | Oil Operator | Feb 1998 |
| 8484 | Dusty Drilling & Producing Corp | New Lexington, OH 43764-1552 | Oil & Gas Operator | Dec 2005 |
| 8485 | Dutch Ridge Gas Ventures, LLC | Charleston, WV 25339 | Oil & Gas Operator | Dec 2021 |
| 8486 | Dutton Bill J Oi | | Oil & Gas Operator | Oct 1992 |
| 8487 | Duty Oil & Gas Prod Co | Akron, OH 44306 | Oil & Gas Operator | Dec 1997 |
| 8488 | Duval Gas Gathering Corporation | Austin, TX 78711 | Oil & Gas Operator | Sep 2026 |
| 8489 | Dvi | | Oil Operator | Dec 2008 |
| 8490 | Dvy Energy LLC | Hadley, PA 16130-2320 | Oil & Gas Operator | Dec 2025 |
| 8491 | Dwarf Oil Company | | Oil & Gas Operator | Mar 2025 |
| 8492 | Dwayne'S Engineering | | Oil Operator | Dec 2025 |
| 8493 | Dwight A Tipton | Houston, TX 77208 | Oil & Gas Operator | Jun 2026 |
| 8494 | Dwight Tipton Et Al | Hobbs, NM 88240 | Oil & Gas Operator | Nov 2002 |
| 8495 | DWJS Inc | Oklahoma City, OK 73159 | Oil & Gas Operator | Sep 2024 |
| 8496 | DWP Oil & Gas | Wichita Falls, TX 76309 | Oil & Gas Operator | Sep 2026 |
| 8497 | Dyad Petroleum Company | Midland, TX 79710 | Oil & Gas Operator | Sep 2021 |
| 8498 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 8499 | Dye Walter M | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 2022 |
| 8500 | Dye, Jennifer J. | South Dayton, NY 14138 | Gas Operator | Dec 2025 |