| 3201 | Noex, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Apr 1998 |
| 3202 | Nomeco Oil & Gas Co. | Jackson, MI 49204 | Oil & Gas Operator | Dec 1994 |
| 3203 | Noram Field Services Corp. | | Oil Operator | Apr 1999 |
| 3204 | Norbay Oil Corp. | | Oil & Gas Operator | Dec 1999 |
| 3205 | Norcen Explorer, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 1998 |
| 3206 | Norco Development, Inc. | | Oil Operator | Jul 1994 |
| 3207 | Norexco Inc. | | Oil & Gas Operator | Aug 1988 |
| 3208 | Nortex Oil & Gas, Inc. | | Oil Operator | Feb 1994 |
| 3209 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 3210 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 3211 | North Central Oil Corp., Et Al | | Oil & Gas Operator | Mar 1977 |
| 3212 | Northcoast Oil Company | | Oil & Gas Operator | Mar 2009 |
| 3213 | Northcott Exploration Co. Inc. | | Oil & Gas Operator | Dec 1987 |
| 3214 | Northeast Resources | | Oil & Gas Operator | Jan 1992 |
| 3215 | Northern Energy Management | | Oil & Gas Operator | Nov 2019 |
| 3216 | Northern Michigan Expl Co | | Oil & Gas Operator | Jul 1990 |
| 3217 | Northla Productions, LLC | | Oil & Gas Operator | Dec 2024 |
| 3218 | Northland Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2003 |
| 3219 | Northridge Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | May 2026 |
| 3220 | Northstar Offshore Group, LLC | | Oil & Gas Operator | Apr 2020 |
| 3221 | Northwest Louisiana Production LLC | | Oil & Gas Operator | Dec 2024 |
| 3222 | Northwest Oil Company | Dallas, TX 75204 | Oil & Gas Operator | Jun 2014 |
| 3223 | Northwind Oil & Gas, LLC | | Oil & Gas Operator | Nov 2019 |
| 3224 | Novus Louisiana LLC | | Oil & Gas Operator | Feb 2006 |
| 3225 | Novy Oil & Gas, Inc. | Goddard, KS 67052 | Oil & Gas Operator | Mar 2026 |
| 3226 | Now Development Co., Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2017 |
| 3227 | NRG Resources, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jun 1987 |
| 3228 | Nucorp Energy, Inc. | | Oil & Gas Operator | Jan 1985 |
| 3229 | Nuevo Energy Company | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 3230 | Nuex Operating, Inc. | | Oil Operator | Oct 2004 |
| 3231 | Nugulf Operating, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 3232 | Numen Corporation | | Oil & Gas Operator | Jan 1982 |
| 3233 | O'Boyle Energy Corporation | | Oil Operator | Feb 1991 |
| 3234 | O'Brien Energy Company | Shreveport, LA 71136 | Oil & Gas Operator | Sep 2019 |
| 3235 | O'Brien Operating Company | Shreveport, LA 71164 | Oil & Gas Operator | Dec 2004 |
| 3236 | O'Malley Production Co Inc. | | Oil & Gas Operator | Mar 1988 |
| 3237 | O'Meara LLC | | Oil & Gas Operator | Oct 2022 |
| 3238 | O'Meara, Inc. | | Oil & Gas Operator | Dec 2006 |
| 3239 | O'Sullivan & Scully, Inc. | | Oil & Gas Operator | Oct 1994 |
| 3240 | O'Sullivan Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2000 |
| 3241 | O. B. And Keith Whatley | | Oil Operator | Jul 1993 |
| 3242 | O. B. Beck | | Oil Operator | Feb 1991 |
| 3243 | O. B. Mobley | | Oil & Gas Operator | Jul 1989 |
| 3244 | O. B. Mobley, Et Al | | Oil Operator | Jul 1989 |
| 3245 | O. B. Whatley | | Oil Operator | Jul 1993 |
| 3246 | O. D. Maybrier | | Oil Operator | Dec 2011 |
| 3247 | O. F. H., Inc. | | Oil Operator | May 1990 |
| 3248 | O. G., Inc. | | Oil & Gas Operator | Nov 1992 |
| 3249 | O. O. Cummings | | Gas Operator | Jan 1999 |
| 3250 | O.B. Whatley Oil Company, Inc. | | Oil Operator | Feb 2013 |
| 3251 | O.B., Keith & Owen B. Whatley | | Oil Operator | Jul 1989 |
| 3252 | O.G.P. Operating, Inc. | Dallas, TX 75231 | Oil & Gas Operator | May 2026 |
| 3253 | O.I.L. Energy, Inc. | | Oil & Gas Operator | Dec 1984 |
| 3254 | Oak Energy, LLC | Houston, TX 77027 | Oil & Gas Operator | May 2026 |
| 3255 | Oak Valley Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2015 |
| 3256 | Oakfield Energy LLC | | Oil Operator | Jun 2019 |
| 3257 | Oakland Corporation | | Oil & Gas Operator | Dec 1981 |
| 3258 | Oakley Oil & Gas, L.L.C. | | Oil & Gas Operator | Mar 2012 |
| 3259 | Oasis Production Co., Inc. | | Oil & Gas Operator | Jun 1988 |
| 3260 | Occ Operating Co. | | Oil & Gas Operator | Apr 2019 |
| 3261 | Occidental Energy Company, Inc. | Houston, TX 77282 | Oil & Gas Operator | Jul 2021 |
| 3262 | Ocean Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 3263 | Octagon Resources Corporation | | Oil Operator | Apr 2005 |
| 3264 | Ody Oil Corp. | | Oil & Gas Operator | Oct 1994 |
| 3265 | Odyssey Operating Company | Shreveport, LA 71106 | Oil & Gas Operator | Sep 2020 |
| 3266 | Offshore Oil & Gas Inc | Houston, TX 77063 | Oil & Gas Operator | Sep 1994 |
| 3267 | Offshore Shelf LLC | | Oil & Gas Operator | Dec 2007 |
| 3268 | Oil & Gas Development Company | | Oil & Gas Operator | May 1991 |
| 3269 | Oil & Gas Producers, Inc | Topeka, KS 66604 | Oil Operator | Jun 2004 |
| 3270 | Oil & Gas Property MGMT., Inc. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1996 |
| 3271 | Oil And Gas Futures, Inc. | | Oil & Gas Operator | May 1977 |
| 3272 | Oil Country Management, Inc. | | Oil & Gas Operator | Jan 2005 |
| 3273 | Oil Lift Inc | Metairie, LA 70002 | Oil & Gas Operator | Apr 2020 |
| 3274 | Oil Palace, Inc. | | Oil Operator | Jun 2016 |
| 3275 | Oil Patch Operators, LLC | | Oil & Gas Operator | Jul 2005 |
| 3276 | Oil Recovery, Inc. | | Oil Operator | Sep 1992 |
| 3277 | Oil Reserves Corp Of America | | Oil & Gas Operator | May 2002 |
| 3278 | Oil Well Buyers Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 2024 |
| 3279 | Oil,Gas & Other Minerals, Inc. | | Oil & Gas Operator | Apr 1996 |
| 3280 | Oilwell Acquisition Co | | Oil & Gas Operator | Jun 1999 |
| 3281 | Ok Oil Company, Inc. | Bivins, TX 75555 | Oil & Gas Operator | Feb 2013 |
| 3282 | Ok-La-Tex Production, Inc. | | Oil & Gas Operator | Jan 1982 |
| 3283 | Okie Crude Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 3284 | Okie Operating Company, LTD. | Tulsa, OK 74103 | Oil & Gas Operator | May 2026 |
| 3285 | Okkatahula, Inc. | | Oil Operator | Nov 1978 |
| 3286 | Oldfield Operating Corporation | | Oil Operator | Dec 2013 |
| 3287 | Oleum Inc | | Oil & Gas Operator | Mar 1996 |
| 3288 | Oleum Operating Company, L.C. | Longview, TX 75606 | Oil & Gas Operator | Dec 2021 |
| 3289 | Oleum Operating La LLC | | Oil & Gas Operator | Nov 2022 |
| 3290 | Oliditt Corporation | | Gas Operator | Mar 2022 |
| 3291 | Oliditt Production Inc. | | Gas Operator | Sep 1998 |
| 3292 | Olipdp II, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2026 |
| 3293 | Olympic Natural Gas Company | | Oil & Gas Operator | Oct 1990 |
| 3294 | Olympic Oil & Gas Co., Inc. | | Oil Operator | Apr 1991 |
| 3295 | Olympic Petroleum Co | Tulsa, OK 74114 | Oil & Gas Operator | Jun 1998 |
| 3296 | Olympic Production Company | | Oil & Gas Operator | Jul 1994 |
| 3297 | Omeara Bros. | | Oil & Gas Operator | Oct 1982 |
| 3298 | Omega Energy Corp. | Graham, TX 76450 | Oil & Gas Operator | May 2026 |
| 3299 | Omega Energy Incorporated | | Oil & Gas Operator | May 1998 |
| 3300 | Omni Operating Company | Osage, WY 82723 | Oil & Gas Operator | Sep 2001 |