| 3301 | Natural Resource MGMT. Corp. | | Oil & Gas Operator | Jun 1989 |
| 3302 | Navarro Gas Production Company | | Gas Operator | Dec 1996 |
| 3303 | Navitas Resources, LLC | | Oil & Gas Operator | May 2016 |
| 3304 | Naylor-Pritchard | | Oil Operator | Jul 1987 |
| 3305 | NCM Operations, Inc. | | Oil Operator | Oct 2000 |
| 3306 | NCX Company, Inc. | | Oil & Gas Operator | Aug 1999 |
| 3307 | Nearburg Producing Company | Dallas, TX 75380 | Oil & Gas Operator | Feb 2026 |
| 3308 | Nebo Operating Company | | Oil & Gas Operator | Apr 1991 |
| 3309 | Needham Resources, Inc. | | Oil & Gas Operator | Jan 1998 |
| 3310 | Neg Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Aug 2025 |
| 3311 | Neilco | | Oil & Gas Operator | Nov 2024 |
| 3312 | Nelson Energy, Inc. | | Oil & Gas Operator | Nov 2024 |
| 3313 | Nelson Oil & Gas, Inc. | | Oil & Gas Operator | Aug 1995 |
| 3314 | Nelson Oil Corporation | | Oil Operator | Jul 1983 |
| 3315 | Nemours Corporation | | Gas Operator | Jan 1986 |
| 3316 | Neosho Operating La, LLC | | Oil Operator | Oct 2016 |
| 3317 | Nerco Oil & Gas Inc | | Oil & Gas Operator | Dec 1996 |
| 3318 | Nestor Petroleum Company | | Oil & Gas Operator | Jun 1986 |
| 3319 | Netco Energy 1 LLC | | Oil Operator | Jan 2025 |
| 3320 | Neuhoff Oil & Gas Corp. | | Oil & Gas Operator | Dec 1986 |
| 3321 | Neumin Production Company | Point Comfort, TX 77978 | Oil & Gas Operator | Feb 2026 |
| 3322 | Nevanen Energy, Inc. | | Oil & Gas Operator | Dec 2022 |
| 3323 | New & Brasher Operating | | Oil Operator | Oct 1984 |
| 3324 | New & Hughes Drilling Co. Inc. | | Oil Operator | Jun 1983 |
| 3325 | New Century Exploration, Inc. | Spring, TX 77379 | Oil & Gas Operator | Feb 2026 |
| 3326 | New Ora Oil, Inc. | | Oil Operator | Aug 1984 |
| 3327 | New Orleans Public Service Inc | | Oil Operator | Dec 1994 |
| 3328 | New York Petroleum Corp. | | Oil & Gas Operator | Nov 1982 |
| 3329 | New-Park, Inc. | | Oil Operator | Sep 1990 |
| 3330 | Newco Inc | Oklahoma City, OK 73177 | Oil Operator | Aug 1999 |
| 3331 | Newfield Exploration Company | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2017 |
| 3332 | Newhaven Operating Inc | | Oil & Gas Operator | Dec 1998 |
| 3333 | Newmont Oil Co. & Colorado | | Oil & Gas Operator | Mar 1978 |
| 3334 | Newmont Oil Company | | Oil & Gas Operator | Sep 1988 |
| 3335 | Newport Operators, LLC | | Oil & Gas Operator | Jan 2019 |
| 3336 | Nexen Petroleum U.S.A. Inc. | Houston, TX 77024 | Oil & Gas Operator | Jul 2012 |
| 3337 | NFR Energy, LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2017 |
| 3338 | NGC Energy Company | | Oil & Gas Operator | May 1989 |
| 3339 | NGL Processing, LLC | | Oil Operator | Jun 2000 |
| 3340 | Nicco Operating Co. | | Oil & Gas Operator | May 1990 |
| 3341 | Nichols Oil & Gas Corporation | Shreveport, LA 71135 | Oil & Gas Operator | Aug 2003 |
| 3342 | Nicklos Oil & Gas Co. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1986 |
| 3343 | Nicor Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Jun 1993 |
| 3344 | Nip-N-Tuck Minerals, Inc. | | Gas Operator | Feb 1988 |
| 3345 | Nippon Oil Exploration USA LTD | | Oil & Gas Operator | Dec 2010 |
| 3346 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 3347 | Noe And Woods | | Gas Operator | Jul 1985 |
| 3348 | Noe And Woods, Et Al | | Gas Operator | Jan 2008 |
| 3349 | Noex, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Apr 1998 |
| 3350 | Nomeco Oil & Gas Co. | Jackson, MI 49204 | Oil & Gas Operator | Dec 1994 |
| 3351 | Nora Lee Clark | | Gas Operator | Feb 2017 |
| 3352 | Noram Field Services Corp. | | Oil Operator | Apr 1999 |
| 3353 | Norbay Oil Corp. | | Oil & Gas Operator | Dec 1999 |
| 3354 | Norcen Explorer, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 1998 |
| 3355 | Norco Development, Inc. | | Oil Operator | Jul 1994 |
| 3356 | Norexco Inc. | | Oil & Gas Operator | Aug 1988 |
| 3357 | Nortex Oil & Gas, Inc. | | Oil Operator | Feb 1994 |
| 3358 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 3359 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 3360 | North Central Oil Corp., Et Al | | Oil & Gas Operator | Mar 1977 |
| 3361 | Northcoast Oil Company | | Oil & Gas Operator | Mar 2009 |
| 3362 | Northcott Exploration Co. Inc. | | Oil & Gas Operator | Dec 1987 |
| 3363 | Northeast Resources | | Oil & Gas Operator | Jan 1992 |
| 3364 | Northern Energy Management | | Oil & Gas Operator | Nov 2019 |
| 3365 | Northern Michigan Expl Co | | Oil & Gas Operator | Jul 1990 |
| 3366 | Northla Productions, LLC | | Oil & Gas Operator | Dec 2024 |
| 3367 | Northland Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2003 |
| 3368 | Northridge Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 3369 | Northstar Offshore Group, LLC | | Oil & Gas Operator | Apr 2020 |
| 3370 | Northwest Louisiana Production LLC | | Oil & Gas Operator | Dec 2024 |
| 3371 | Northwest Oil Company | Dallas, TX 75204 | Oil & Gas Operator | Jun 2014 |
| 3372 | Northwind Oil & Gas, LLC | | Oil & Gas Operator | Nov 2019 |
| 3373 | Nova Gas & Oil, Inc. | | Oil & Gas Operator | Aug 1997 |
| 3374 | Novus Louisiana LLC | | Oil & Gas Operator | Feb 2006 |
| 3375 | Novy Oil & Gas, Inc. | Goddard, KS 67052 | Oil & Gas Operator | Dec 2025 |
| 3376 | Now Development Co., Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2017 |
| 3377 | NRG Resources, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jun 1987 |
| 3378 | Nucorp Energy, Inc. | | Oil & Gas Operator | Jan 1985 |
| 3379 | Nuevo Energy Company | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 3380 | Nuex Operating, Inc. | | Oil Operator | Oct 2004 |
| 3381 | Nugulf Operating, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 3382 | Numen Corporation | | Oil & Gas Operator | Jan 1982 |
| 3383 | O'Boyle Energy Corporation | | Oil Operator | Feb 1991 |
| 3384 | O'Brien Energy Company | Shreveport, LA 71136 | Oil & Gas Operator | Sep 2019 |
| 3385 | O'Brien Operating Company | Shreveport, LA 71164 | Oil & Gas Operator | Dec 2004 |
| 3386 | O'Malley Production Co Inc. | | Oil & Gas Operator | Mar 1988 |
| 3387 | O'Meara LLC | | Oil & Gas Operator | Oct 2022 |
| 3388 | O'Meara, Inc. | | Oil & Gas Operator | Dec 2006 |
| 3389 | O'Sullivan & Scully, Inc. | | Oil & Gas Operator | Oct 1994 |
| 3390 | O'Sullivan Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2000 |
| 3391 | O. B. And Keith Whatley | | Oil Operator | Jul 1993 |
| 3392 | O. B. Beck | | Oil Operator | Feb 1991 |
| 3393 | O. B. Mobley | | Oil & Gas Operator | Jul 1989 |
| 3394 | O. B. Mobley, Et Al | | Oil Operator | Jul 1989 |
| 3395 | O. B. Whatley | | Oil Operator | Jul 1993 |
| 3396 | O. D. Maybrier | | Oil Operator | Dec 2011 |
| 3397 | O. F. H., Inc. | | Oil Operator | May 1990 |
| 3398 | O. G., Inc. | | Oil & Gas Operator | Nov 1992 |
| 3399 | O. O. Cummings | | Gas Operator | Jan 1999 |
| 3400 | O.B. Whatley Oil Company, Inc. | | Oil Operator | Feb 2013 |