| 21401 | Northwest Well Service, Inc. | Merino, CO 80741 | Oil Operator | Mar 2002 |
| 21402 | Northwestern Corporation | Butte, MT 59701 | Oil & Gas Operator | Dec 2025 |
| 21403 | Northwestern Energy, LLC | Butte, MT 59701 | Oil & Gas Operator | Dec 2004 |
| 21404 | Northwestern Inc | East Brady, PA 16028 | Gas Operator | Dec 2012 |
| 21405 | Northwestern Production LLC | | Oil & Gas Operator | Apr 2024 |
| 21406 | Northwind Development Company | | Oil Operator | Oct 1995 |
| 21407 | Northwind Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 1995 |
| 21408 | Northwind Oil & Gas, LLC | | Oil & Gas Operator | Nov 2019 |
| 21409 | Northwind Oil Company | Tulsa, OK 74137 | Oil & Gas Operator | May 1998 |
| 21410 | Northwood Energy Corp | Columbus, OH 43221 | Oil & Gas Operator | Sep 2025 |
| 21411 | Norton Drilling Co. | Levelland, TX 79336 | Oil & Gas Operator | Nov 2001 |
| 21412 | Norton Frickey | Lakewood, CO 80215 | Oil & Gas Operator | Dec 2023 |
| 21413 | Norton Oil Co. | | Oil & Gas Operator | Jun 1984 |
| 21414 | Norvel Douglas Oil Inc. | H SPG NTL PK, AR 71909 | Oil Operator | Oct 2025 |
| 21415 | Norwes Industries, Inc. | | Oil & Gas Operator | Jun 2000 |
| 21416 | Norwood Energy, Inc | | Oil Operator | Dec 2015 |
| 21417 | Norwood Oil | Greeley, CO 80634 | Oil Operator | Mar 1996 |
| 21418 | Norwood Oil Corp | Malakoff, TX 75148 | Oil & Gas Operator | Oct 1995 |
| 21419 | Norwood, A. N., Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 1997 |
| 21420 | Nosivad Oil, Inc. | Clyde, TX 79510 | Oil & Gas Operator | Feb 2026 |
| 21421 | Nossaman E Oil Inc | Del City, OK 73155-5449 | Oil Operator | Oct 2002 |
| 21422 | Nott, Gregory | Wichita, KS 67214 | Oil Operator | Sep 2025 |
| 21423 | Notting Hill Energy LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Feb 2026 |
| 21424 | Nottis, David J. | West Valley, NY 14171 | Gas Operator | Dec 2024 |
| 21425 | Noumenon Corporation | Core, WV 26541-7072 | Oil & Gas Operator | Dec 2025 |
| 21426 | Nova Energy Corporation | Denver, CO 80201 | Oil & Gas Operator | Jun 2003 |
| 21427 | Nova Energy Inc | Casper, WY 82601 | Oil & Gas Operator | Oct 2020 |
| 21428 | Nova Gas & Oil, Inc. | | Oil & Gas Operator | Aug 1997 |
| 21429 | Nova Natural Res Corp | Denver, CO 80202 | Oil & Gas Operator | Nov 1989 |
| 21430 | Nova Petroleum Cororation | | Oil & Gas Operator | Mar 1987 |
| 21431 | Nova Petroleum Corp | Salt Lake City, UT 84147 | Oil & Gas Operator | Sep 1986 |
| 21432 | Novco Operating Company | Novice, TX 79538 | Oil & Gas Operator | Feb 2026 |
| 21433 | Novo Energy Resources | Houston, TX 77006 | Oil & Gas Operator | Feb 2026 |
| 21434 | Novo Exploration Corporation | Hurst, TX 76053 | Oil & Gas Operator | Jun 2020 |
| 21435 | Novo II Operating, LLC | Oklahoma City, OK 73116 | Gas Operator | Dec 2025 |
| 21436 | Novo Oil & Gas Northern Delaware, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 21437 | Novus Louisiana LLC | | Oil & Gas Operator | Feb 2006 |
| 21438 | Novus Oil & Gas, LP | Houston, TX 77042 | Oil & Gas Operator | Nov 2005 |
| 21439 | Novy Oil & Gas, Inc. | Goddard, KS 67052 | Oil & Gas Operator | Dec 2025 |
| 21440 | Now Development Co., Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2017 |
| 21441 | Nowata Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Sep 1997 |
| 21442 | Nowata Petroleum Operating Co | Nowata, OK 74048-9617 | Oil Operator | Aug 2014 |
| 21443 | Noxxe | Ottawa, KS 66067 | Oil & Gas Operator | Dec 2023 |
| 21444 | Noxxe Oil And Gas, LLC | Houston, TX 77269 | Oil & Gas Operator | Feb 2026 |
| 21445 | NP Energy Corporation | Englewood, CO 80111 | Oil & Gas Operator | Jun 1989 |
| 21446 | NP Resources, LLC | | Oil & Gas Operator | Aug 2022 |
| 21447 | NPF Energy Corporation | Boise, ID 83708 | Oil & Gas Operator | Sep 2025 |
| 21448 | NRC Development, LLC | | Gas Operator | Nov 2002 |
| 21449 | NRD - Rein Resources, A General Partnership | Union, KY 41091 | Oil Operator | Sep 2025 |
| 21450 | NRG Assets Management, LLC | Houston, TX 77057 | Oil & Gas Operator | Nov 2016 |
| 21451 | NRG Oil LLC | Stratford, OK 74872-9732 | Oil Operator | Feb 2012 |
| 21452 | NRG Resources, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jun 1987 |
| 21453 | NRPC Operating, LLC | Dallas, TX 75206 | Oil Operator | Feb 2012 |
| 21454 | NS Oil LLC | Minneapolis, MN 55410 | Oil Operator | Nov 2025 |
| 21455 | NT Minerals, LLC | Tulsa, OK 74172 | Oil & Gas Operator | Feb 2026 |
| 21456 | NTR Energy LLC (Osage Cty Only) | | Oil & Gas Operator | Apr 2020 |
| 21457 | NTS Energy LLC | Indiana, PA 15701-1801 | Oil & Gas Operator | Dec 2015 |
| 21458 | Nub'S Well Servicing Inc | Ratliff City, OK 73481 | Oil & Gas Operator | Dec 2025 |
| 21459 | Nucomer Energy LLC | Erie, PA 16510 | Oil & Gas Operator | Dec 2025 |
| 21460 | Nucor Oil & Gas Inc | Riverton, WY 82501 | Oil & Gas Operator | Dec 2025 |
| 21461 | Nucorp Energy, Inc. | | Oil & Gas Operator | Jan 1985 |
| 21462 | Nueces Minerals Company | Dallas, TX 75251 | Oil & Gas Operator | May 2021 |
| 21463 | Nueces Oil Company | George West, TX 78022 | Oil & Gas Operator | Mar 2008 |
| 21464 | Nueces Petroleum Corporation | Sugar Land, TX 77496 | Oil Operator | Feb 2026 |
| 21465 | Nueces Reserves, Inc. | Houston, TX 77019 | Oil & Gas Operator | Oct 2002 |
| 21466 | Nuenergy LLC | | Oil Operator | Dec 2016 |
| 21467 | Nuevida Resources, LLC | Dallas, TX 75235 | Gas Operator | Nov 2025 |
| 21468 | Nuevo Energy Company | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 21469 | Nuevo Texas Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2004 |
| 21470 | Nuex Operating, Inc. | | Oil Operator | Oct 2004 |
| 21471 | Nugen James B | Reynoldsburg, OH 43068 | Oil & Gas Operator | Dec 1989 |
| 21472 | Nugulf Operating, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 21473 | Null, W. M. & San Patricio Corp. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Aug 1994 |
| 21474 | Null, W.M. Operations, Inc. | Corpus Chrsti, TX 78475 | Oil & Gas Operator | Jun 2002 |
| 21475 | Numac LLC | Cherryvale, KS 67335 | Oil Operator | Jun 2025 |
| 21476 | Numar Oil And Gas Corporation | Sante Fe, NM 87502 | Oil & Gas Operator | Feb 2026 |
| 21477 | Numatex, Inc | | Oil Operator | Dec 2013 |
| 21478 | Numen Corporation | | Oil & Gas Operator | Jan 1982 |
| 21479 | Nupower Energy, LLC | Houston, TX 77058 | Oil & Gas Operator | Feb 2026 |
| 21480 | Nuroc Energy Incorporated | Andrews, TX 79714 | Oil Operator | Dec 2025 |
| 21481 | Nuss Oil Operations | | Oil & Gas Operator | Aug 1998 |
| 21482 | Nuss Sally | | Oil Operator | Mar 1982 |
| 21483 | Nuss, Fred J. | Hoisington, KS 67544 | Gas Operator | Sep 2025 |
| 21484 | Nuss, Kenneth J. | Russell, KS 67665 | Oil Operator | Aug 1997 |
| 21485 | Nutek Oil Inc | San Antonio, TX 78254 | Oil & Gas Operator | Feb 2006 |
| 21486 | Nutt Jerrie | Duncan, OK 73534-0698 | Oil & Gas Operator | Nov 2016 |
| 21487 | Nuttco Oil & Gas | Corning, OH 43730 | Oil & Gas Operator | Dec 2010 |
| 21488 | Nuwi-Bayshore LLC | | Oil & Gas Operator | Dec 1999 |
| 21489 | NV O&G Investments LLC /Osage Only | | Oil Operator | Sep 2022 |
| 21490 | NWG Operating LLC | Canyon, TX 79015 | Oil & Gas Operator | Feb 2026 |
| 21491 | NWM Operating Inc | Okeene, OK 73763 | Oil & Gas Operator | Nov 2025 |
| 21492 | NWM Properties LLC | Tulsa, OK 74131-4426 | Oil Operator | Dec 2025 |
| 21493 | Ny Oil Inc. | | Oil Operator | Dec 2025 |
| 21494 | Nyc Resources LTD | Tulsa, OK 74133-5700 | Oil & Gas Operator | Sep 2014 |
| 21495 | Nye Exploration & Prod, L.L.C. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2026 |
| 21496 | Nye Oil Company | Oklahoma City, OK 73118-1245 | Oil & Gas Operator | Jun 2004 |
| 21497 | Nys Natural Gas Co | Englewood, CO 80111-4737 | Gas Operator | Dec 1984 |
| 21498 | Nytex Energy LLC | Edmond, OK 73083-5946 | Oil & Gas Operator | Sep 2015 |
| 21499 | Nytex Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2014 |
| 21500 | Nytex, L.L.C. | Edmond, OK 73083 | Oil & Gas Operator | Feb 2006 |