| 20401 | Nowata Petroleum Operating Co | Nowata, OK 74048-9617 | Oil Operator | Aug 2014 |
| 20402 | Nowea, Inc | Melbourne, FL 32901 | Oil Operator | Dec 2024 |
| 20403 | Noxxe | Ottawa, KS 66067 | Oil & Gas Operator | Dec 2024 |
| 20404 | Noxxe Oil And Gas, LLC | Houston, TX 77269 | Oil & Gas Operator | Jul 2026 |
| 20405 | NP Energy Corporation | Englewood, CO 80111 | Oil & Gas Operator | Jun 1989 |
| 20406 | NP Resources, LLC | | Oil & Gas Operator | Aug 2022 |
| 20407 | NPF Energy Corporation | Boise, ID 83708 | Oil & Gas Operator | Mar 2026 |
| 20408 | NRC Development, LLC | | Gas Operator | Nov 2002 |
| 20409 | NRD - Rein Resources, A General Partnership | Union, KY 41091 | Oil Operator | Mar 2026 |
| 20410 | NRG Assets Management, LLC | Houston, TX 77057 | Oil & Gas Operator | Nov 2016 |
| 20411 | NRG Oil LLC | Stratford, OK 74872-9732 | Oil Operator | Feb 2012 |
| 20412 | NRG Resources, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jun 1987 |
| 20413 | NRPC Operating, LLC | Dallas, TX 75206 | Oil Operator | Feb 2012 |
| 20414 | NS Oil LLC | Minneapolis, MN 55410 | Oil Operator | Apr 2026 |
| 20415 | NSP Resources, LLC | Houston, TX 77018 | Oil & Gas Operator | May 2026 |
| 20416 | NT Minerals, LLC | Tulsa, OK 74172 | Oil & Gas Operator | Jul 2026 |
| 20417 | NTR Energy LLC (Osage Cty Only) | | Oil & Gas Operator | Apr 2020 |
| 20418 | NTS Energy LLC | Indiana, PA 15701-1801 | Oil & Gas Operator | Dec 2015 |
| 20419 | Nub'S Well Servicing Inc | Ratliff City, OK 73481 | Oil & Gas Operator | May 2026 |
| 20420 | Nucomer Energy LLC | Erie, PA 16510 | Oil & Gas Operator | Apr 2026 |
| 20421 | Nucor Oil & Gas Inc | Riverton, WY 82501 | Oil & Gas Operator | Apr 2026 |
| 20422 | Nucorp Energy, Inc. | | Oil & Gas Operator | Jan 1985 |
| 20423 | Nueces Minerals Company | Dallas, TX 75251 | Oil & Gas Operator | May 2021 |
| 20424 | Nueces Oil Company | George West, TX 78022 | Oil & Gas Operator | Mar 2008 |
| 20425 | Nueces Petroleum Corporation | Sugar Land, TX 77496 | Oil Operator | Jul 2026 |
| 20426 | Nueces Reserves, Inc. | Houston, TX 77019 | Oil & Gas Operator | Oct 2002 |
| 20427 | Nuenergy LLC | | Oil & Gas Operator | May 2026 |
| 20428 | Nuevida Resources, LLC | Dallas, TX 75235 | Gas Operator | Apr 2026 |
| 20429 | Nuevo Energy Company | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 20430 | Nuevo Texas Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2004 |
| 20431 | Nuex Operating, Inc. | | Oil Operator | Oct 2004 |
| 20432 | Nugulf Operating, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 20433 | Null, W. M. & San Patricio Corp. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Aug 1994 |
| 20434 | Null, W.M. Operations, Inc. | Corpus Chrsti, TX 78475 | Oil & Gas Operator | Jun 2002 |
| 20435 | Numac LLC | Cherryvale, KS 67335 | Oil Operator | Mar 2026 |
| 20436 | Numar Oil And Gas Corporation | Sante Fe, NM 87502 | Oil & Gas Operator | Jul 2026 |
| 20437 | Numatex, Inc | | Oil Operator | Dec 2013 |
| 20438 | Numen Corporation | | Oil & Gas Operator | Jan 1982 |
| 20439 | Nupower Energy, LLC | Houston, TX 77058 | Oil & Gas Operator | Jul 2026 |
| 20440 | Nuroc Energy Incorporated | Andrews, TX 79714 | Oil Operator | May 2026 |
| 20441 | Nuss Oil Operations | | Oil & Gas Operator | Aug 1998 |
| 20442 | Nuss Sally | | Oil Operator | Mar 1982 |
| 20443 | Nuss, Fred J. | Hoisington, KS 67544 | Gas Operator | Mar 2026 |
| 20444 | Nuss, Kenneth J. | Russell, KS 67665 | Oil Operator | Aug 1997 |
| 20445 | Nutek Oil Inc | San Antonio, TX 78254 | Oil & Gas Operator | Feb 2006 |
| 20446 | Nutt Jerrie | Duncan, OK 73534-0698 | Oil & Gas Operator | Nov 2016 |
| 20447 | Nuttco Oil & Gas | Corning, OH 43730 | Oil & Gas Operator | Dec 2010 |
| 20448 | Nuwi-Bayshore LLC | | Oil & Gas Operator | Dec 1999 |
| 20449 | NV O&G Investments LLC /Osage Only | | Oil Operator | Sep 2022 |
| 20450 | NWG Operating LLC | Canyon, TX 79015 | Oil & Gas Operator | Jul 2026 |
| 20451 | NWM Operating Inc | Okeene, OK 73763 | Oil & Gas Operator | Apr 2026 |
| 20452 | NWM Properties LLC | Tulsa, OK 74131-4426 | Oil Operator | May 2026 |
| 20453 | Ny Oil Inc. | | Oil Operator | May 2026 |
| 20454 | Nyc Resources LTD | Tulsa, OK 74133-5700 | Oil & Gas Operator | Sep 2014 |
| 20455 | Nye Exploration & Prod, L.L.C. | Corpus Christ, TX 78401 | Oil & Gas Operator | Jul 2026 |
| 20456 | Nye Oil Company | Oklahoma City, OK 73118-1245 | Oil & Gas Operator | Jun 2004 |
| 20457 | Nytex Energy LLC | Edmond, OK 73083-5946 | Oil & Gas Operator | Sep 2015 |
| 20458 | Nytex Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2014 |
| 20459 | Nytex, L.L.C. | Edmond, OK 73083 | Oil & Gas Operator | Feb 2006 |
| 20460 | Nytis Exploration Company LLC | Lexington, KY 40509 | Oil & Gas Operator | Dec 2021 |
| 20461 | NZ Operating Company Inc. | Houston, TX 77069 | Oil & Gas Operator | Jul 2026 |
| 20462 | O & G Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Oct 1996 |
| 20463 | O & O Operators, LLC. | Fate, TX 75132 | Oil & Gas Operator | Jul 2026 |
| 20464 | O G & E | Oklahoma City, OK 73124 | Oil & Gas Operator | Feb 2014 |
| 20465 | O H Berry | Midland, TX 79702 | Oil & Gas Operator | Feb 2003 |
| 20466 | O Hill Enterprises, Inc. | La Grange, TX 78945 | Oil & Gas Operator | Jan 2014 |
| 20467 | O I L Energy Corp | | Oil & Gas Operator | Oct 2017 |
| 20468 | O I L Niagaran LLC | | Oil & Gas Operator | May 2017 |
| 20469 | O K Swabbing Inc | Hennessey, OK 73742 | Oil & Gas Operator | Apr 2026 |
| 20470 | O S & J Operatin | | Oil Operator | Nov 1984 |
| 20471 | O S & S Oil Company | Electra, TX 76360 | Oil & Gas Operator | Jan 2018 |
| 20472 | O&G Investments Inc. | Runge, TX 78151 | Oil & Gas Operator | Feb 2003 |
| 20473 | O'Bar Operating Co., Inc. | Longview, TX 75604 | Oil & Gas Operator | Jul 2026 |
| 20474 | O'Benco, Inc. | Shreveport, LA 71136 | Oil & Gas Operator | Jul 2026 |
| 20475 | O'Blue Corp. | Kerrville, TX 78028 | Oil & Gas Operator | Mar 1998 |
| 20476 | O'Boyle Energy Corporation | | Oil Operator | Feb 1991 |
| 20477 | O'Brien Energy Company | Shreveport, LA 71136 | Oil & Gas Operator | Sep 2019 |
| 20478 | O'Brien Energy Resources Corp | Portsmouth, NH 03801 | Oil & Gas Operator | Jul 2026 |
| 20479 | O'Brien Oil Corporation | Guthrie, OK 73044-3154 | Oil & Gas Operator | Apr 2026 |
| 20480 | O'Brien Oil LLC | Guthrie, OK 73044-3154 | Oil & Gas Operator | Apr 2020 |
| 20481 | O'Brien Operating Company | Shreveport, LA 71164 | Oil & Gas Operator | Dec 2004 |
| 20482 | O'Brien Resources LLC | Shreveport, LA 71136 | Oil Operator | Nov 2017 |
| 20483 | O'Brien, George H. Jr. | Midland, TX 79701 | Oil & Gas Operator | Jun 1994 |
| 20484 | O'Brien-Sill | | Oil & Gas Operator | May 2026 |
| 20485 | O'Connell, James P. | Vacaville, CA 95687 | Oil Operator | Nov 2009 |
| 20486 | O'Connor & Hewitt, LTD. | Victoria, TX 77901 | Oil & Gas Operator | Jun 1998 |
| 20487 | O'Connor Energy Management, LLC | Victoria, TX 77902 | Oil Operator | Jul 2026 |
| 20488 | O'Connor, Emma | Hamburg, NY 14075 | Gas Operator | Dec 2025 |
| 20489 | O'Dell, Mitchell | Cross Plains, TX 76443 | Oil & Gas Operator | Jul 2026 |
| 20490 | O'Donnell Bill C | Tulsa, OK 74135-4241 | Oil & Gas Operator | Oct 2014 |
| 20491 | O'Donnell Oil LLC | | Oil & Gas Operator | Apr 2026 |
| 20492 | O'Donohoe, Jack | Wichita Falls, TX 76301 | Oil & Gas Operator | May 2002 |
| 20493 | O'Gorman, Brendan & Wheeler, Anne | North Collins, NY 14111 | Gas Operator | Dec 2025 |
| 20494 | O'Gorman, Kevin | Eden, NY 14057 | Gas Operator | Dec 2025 |
| 20495 | O'Hare Energy Co | | Oil Operator | Dec 1983 |
| 20496 | O'Hern Morris D | Mounds, OK 74047-5163 | Oil & Gas Operator | Sep 2016 |
| 20497 | O'Leary'S Oil & Gas Inc. | Arcadia, FL 34266 | Oil & Gas Operator | May 2008 |
| 20498 | O'Malley Production Co Inc. | | Oil & Gas Operator | Mar 1988 |
| 20499 | O'Meara LLC | | Oil & Gas Operator | Oct 2022 |
| 20500 | O'Meara, Inc. | | Oil & Gas Operator | Dec 2006 |