| 401 | Nielco, Inc. | Billings, MT 59103 | Oil & Gas Operator | Apr 2002 |
| 402 | Nielson & Associates Inc | Cody, WY 82414 | Oil & Gas Operator | Feb 2016 |
| 403 | Nielson Capital Partners LLC | Cody, WY 82414 | Oil & Gas Operator | Dec 2014 |
| 404 | Nielson Enterpri | | Oil & Gas Operator | Sep 1987 |
| 405 | Nieset Lawrence & Christopher | Helena, OH 43435 | Oil Operator | Dec 2024 |
| 406 | Night Owl Well Service | Cairo, WV 26337-0000 | Oil & Gas Operator | Dec 2021 |
| 407 | Nightengale Henr | | Gas Operator | Nov 1996 |
| 408 | Nighthawk Production LLC | | Oil & Gas Operator | Jun 2018 |
| 409 | Nijean, Inc. | Shawnee, OK 74802 | Oil & Gas Operator | Feb 2012 |
| 410 | Nimrod Petroleum Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Dec 2002 |
| 411 | Nine Point Energy, LLC | | Oil & Gas Operator | Oct 2021 |
| 412 | Nineveh Corp. | Dallas, TX 75208 | Oil & Gas Operator | Apr 2025 |
| 413 | Niobrara Illuminating Gas Associates LLC | | Oil & Gas Operator | Oct 2009 |
| 414 | Nip-N-Tuck Minerals, Inc. | | Gas Operator | Feb 1988 |
| 415 | Nippon Oil Exploration USA LTD | | Oil & Gas Operator | Dec 2010 |
| 416 | Nisrol, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Sep 2018 |
| 417 | Nitcher, Benton L. | Wellsville, KS 66092 | Oil & Gas Operator | Dec 1995 |
| 418 | Nitro Energy, Inc. | | Gas Operator | Dec 2005 |
| 419 | Nitro Oil & Gas, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 420 | Nitro Petroleum Inc | Phoenix, AZ 85016-4599 | Oil & Gas Operator | May 2020 |
| 421 | Nitschke, Dan E. | Henrietta, TX 76365 | Oil & Gas Operator | Apr 2025 |
| 422 | Nivens Productions LLC | Coyle, OK 73027-9785 | Oil & Gas Operator | Aug 2024 |
| 423 | Nix, Tommy | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 424 | Nixon Properties Inc | Tulsa, OK 74104 | Oil & Gas Operator | Aug 2023 |
| 425 | Nixon R P Operat | | Oil Operator | Aug 1995 |
| 426 | Nizen, Stanley | FT Stockton, TX 79735 | Oil & Gas Operator | May 2002 |
| 427 | Nja Operating LLC | Perryton, TX 79070 | Oil & Gas Operator | Apr 2025 |
| 428 | Nject Disposal LLC | Houston, TX 77027 | Oil Operator | Mar 2017 |
| 429 | NJL Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Feb 2007 |
| 430 | Njre Operating Company | Tulsa, OK 74119 | Gas Operator | Dec 2016 |
| 431 | NKC Energy, LLC | Bruceville, TX 76630 | Oil Operator | Apr 2025 |
| 432 | NLC Newstead Holdings LLC | Akron, NY 14001 | Gas Operator | Dec 2023 |
| 433 | NM&O Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2024 |
| 434 | NMR Energy LLC | Houston, TX 77063 | Oil & Gas Operator | Apr 2025 |
| 435 | NMT Oil Company Inc. | | Oil & Gas Operator | Dec 2024 |
| 436 | Nne Resources LLC | Charleston, WV 25301 | Oil & Gas Operator | Dec 2021 |
| 437 | Nnogc Exploration & Production, LLC | Window Rock, AZ 86515 | Oil & Gas Operator | Feb 2025 |
| 438 | Noah, Calvin | Valley Center, KS 67147 | Oil Operator | Oct 2010 |
| 439 | Noarko Resources | | Oil & Gas Operator | Mar 1990 |
| 440 | Nobbs, Gary H. And Bosinski, Kathy | Eden, NY 14057 | Gas Operator | Dec 2023 |
| 441 | Nobel Petroleum USA Inc. | League City, TX 77573 | Oil Operator | Apr 2025 |
| 442 | Noble & Cantrell Expl. Co., Inc. | Winnsboro, TX 75494 | Oil & Gas Operator | Aug 2006 |
| 443 | Noble Drilling Corp Expl Div | Houston, TX 77042 | Oil & Gas Operator | Feb 1992 |
| 444 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2025 |
| 445 | Noble Energy Production Inc | Houston, TX 77067 | Oil & Gas Operator | Apr 2025 |
| 446 | Noble Exploration, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Aug 2003 |
| 447 | Noble Gas Co | Wooster, OH 44691 | Oil & Gas Operator | Dec 1997 |
| 448 | Noble Oil Corp | Columbus, OH 43229 | Oil & Gas Operator | Dec 1996 |
| 449 | Noble Operating Company Inc | Garden City, KS 67846 | Oil & Gas Operator | Sep 2014 |
| 450 | Noble Operating, LLC | Flower Mound, TX 75028 | Oil & Gas Operator | Sep 2013 |
| 451 | Noble Petroleum LLC | Lower Salem, OH 45745-9648-9648 | Oil & Gas Operator | Dec 2024 |
| 452 | Noble Petroleum, Inc. | Wichita, KS 67205 | Oil Operator | Sep 2013 |
| 453 | Noble Producing Company Inc. | Dallas, TX 75244 | Oil & Gas Operator | Mar 1996 |
| 454 | Noble Resources Inc | Mannford, OK 74044 | Oil & Gas Operator | Jan 2025 |
| 455 | Noble, Alton L | Westfield, NY 14787 | Gas Operator | Dec 2023 |
| 456 | Nobleson Operating, Inc. | Dallas, TX 75244 | Oil & Gas Operator | Jun 1996 |
| 457 | Noc | Iowa Park, TX 76367 | Oil & Gas Operator | Dec 2020 |
| 458 | Noco Investment Company Inc | Tulsa, OK 74159-0470 | Oil & Gas Operator | Mar 2005 |
| 459 | Nodding Donkey Production | Pampa, TX 79065 | Oil & Gas Operator | Apr 2025 |
| 460 | Noe And Woods, Et Al | | Gas Operator | Jan 2008 |
| 461 | Noe, T. C. Oil Acct. | Selman City, TX 75689 | Oil & Gas Operator | May 1996 |
| 462 | Noel Operating, Inc. | Huntsville, TX 77340 | Oil & Gas Operator | Oct 2000 |
| 463 | Noex, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Apr 1998 |
| 464 | Nog Production & Operating LLC | Goliad, TX 77963 | Oil & Gas Operator | Apr 2025 |
| 465 | Nogp Operating Company Inc | Frisco, TX 75033 | Oil & Gas Operator | Jan 2025 |
| 466 | Noir-Blanc | Russell, KS 67665 | Oil Operator | May 1992 |
| 467 | Nokota Energy Corporation | Bakersfield, CA 93313 | Oil Operator | Apr 2025 |
| 468 | Nokusu, LTD. | Dallas, TX 75231 | Oil & Gas Operator | Sep 2008 |
| 469 | Nolen Oil & Gas | Beeville, TX 78102 | Oil & Gas Operator | Apr 2025 |
| 470 | Nolen, Charles R. | San Angelo, TX 76904 | Oil & Gas Operator | Dec 2006 |
| 471 | Nolin Rural Electric Coop | Elizabethtown, KY 42701 | Gas Operator | Dec 2023 |
| 472 | Nolt, Leonard R. And Marian M. Nolt | Dundee, NY 14837 | Gas Operator | Dec 2023 |
| 473 | Nolte, Mike E. | Longview, TX 75606 | Oil & Gas Operator | Jun 1995 |
| 474 | Nolte, Mike E., Inc. | Longview, TX 75606 | Oil & Gas Operator | Feb 2006 |
| 475 | Nolteco, Inc. | Longview, TX 75606 | Oil & Gas Operator | Apr 2025 |
| 476 | Nomeco Oil & Gas Co. | Jackson, MI 49204 | Oil & Gas Operator | Dec 1994 |
| 477 | Nomoc Oil Company Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | May 2006 |
| 478 | Nondorf Oil & Ga | | Oil Operator | Dec 1986 |
| 479 | Nondorf Oil & Gas Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2008 |
| 480 | Nonsuch Natural Gas Inc | Naples, FL 34108 | Oil & Gas Operator | Feb 2025 |
| 481 | Noonday Exploration, LLC | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 482 | Nooner Cynthia | Ratliff City, OK 73481 | Oil Operator | Jan 2025 |
| 483 | Nor-Am Exploration | | Oil Operator | Jun 1981 |
| 484 | Nor-West Kansas Oil, L.L.C. | Wakeeney, KS 67672 | Oil Operator | Dec 2019 |
| 485 | Nora Company | Pampa, TX 79065 | Oil & Gas Operator | Apr 2025 |
| 486 | Noram Field Services Corp. | | Oil Operator | Apr 1999 |
| 487 | Noram Operating Company | Houston, TX 77002 | Oil Operator | Oct 1999 |
| 488 | Noramco Production, LLC | Midland, TX 79710 | Oil & Gas Operator | Jan 2023 |
| 489 | Norbay Oil Corp. | | Oil & Gas Operator | Dec 1999 |
| 490 | Norbert J Baumgart | Warren, PA 16365-3403 | Oil & Gas Operator | Dec 2009 |
| 491 | Norcen Energy Inc | | Oil Operator | Dec 1989 |
| 492 | Norcen Explorer, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 1998 |
| 493 | Norco Development, Inc. | | Oil Operator | Jul 1994 |
| 494 | Nordan & Company | San Antonio, TX 78205 | Oil & Gas Operator | Jun 2004 |
| 495 | Nordan Oil & Gas Corporation | Abilene, TX 79604 | Oil & Gas Operator | Feb 2018 |
| 496 | Nordan Trust, The | San Antonio, TX 78205 | Oil & Gas Operator | Nov 2003 |
| 497 | Nordic Oil Company | | Oil & Gas Operator | Dec 1999 |
| 498 | Nordmeyer Oil, Inc. | Toronto, KS 66777 | Oil Operator | Dec 2019 |
| 499 | Nordstrand Engineering Inc | Houston, TX 77019 | Oil & Gas Operator | Apr 2025 |
| 500 | Nordstrand/Galoostian Oil & Gas | Houston, TX 77056 | Oil Operator | Mar 1998 |