| 20301 | Null, W. M. & San Patricio Corp. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Aug 1994 |
| 20302 | Null, W.M. Operations, Inc. | Corpus Chrsti, TX 78475 | Oil & Gas Operator | Jun 2002 |
| 20303 | Numac LLC | Cherryvale, KS 67335 | Oil Operator | Jun 2025 |
| 20304 | Numar Oil And Gas Corporation | Sante Fe, NM 87502 | Oil & Gas Operator | Jun 2026 |
| 20305 | Numatex, Inc | | Oil Operator | Dec 2013 |
| 20306 | Numen Corporation | | Oil & Gas Operator | Jan 1982 |
| 20307 | Nupower Energy, LLC | Houston, TX 77058 | Oil & Gas Operator | Jun 2026 |
| 20308 | Nuroc Energy Incorporated | Andrews, TX 79714 | Oil Operator | Apr 2026 |
| 20309 | Nuss Oil Operations | | Oil & Gas Operator | Aug 1998 |
| 20310 | Nuss Sally | | Oil Operator | Mar 1982 |
| 20311 | Nuss, Fred J. | Hoisington, KS 67544 | Gas Operator | Feb 2026 |
| 20312 | Nuss, Kenneth J. | Russell, KS 67665 | Oil Operator | Aug 1997 |
| 20313 | Nutek Oil Inc | San Antonio, TX 78254 | Oil & Gas Operator | Feb 2006 |
| 20314 | Nutt Jerrie | Duncan, OK 73534-0698 | Oil & Gas Operator | Nov 2016 |
| 20315 | Nuttco Oil & Gas | Corning, OH 43730 | Oil & Gas Operator | Dec 2010 |
| 20316 | Nuwi-Bayshore LLC | | Oil & Gas Operator | Dec 1999 |
| 20317 | NV O&G Investments LLC /Osage Only | | Oil Operator | Sep 2022 |
| 20318 | NWG Operating LLC | Canyon, TX 79015 | Oil & Gas Operator | Jun 2026 |
| 20319 | NWM Operating Inc | Okeene, OK 73763 | Oil & Gas Operator | Feb 2026 |
| 20320 | NWM Properties LLC | Tulsa, OK 74131-4426 | Oil Operator | Feb 2026 |
| 20321 | Ny Oil Inc. | | Oil Operator | Mar 2026 |
| 20322 | Nyc Resources LTD | Tulsa, OK 74133-5700 | Oil & Gas Operator | Sep 2014 |
| 20323 | Nye Exploration & Prod, L.L.C. | Corpus Christ, TX 78401 | Oil & Gas Operator | Jun 2026 |
| 20324 | Nye Oil Company | Oklahoma City, OK 73118-1245 | Oil & Gas Operator | Jun 2004 |
| 20325 | Nytex Energy LLC | Edmond, OK 73083-5946 | Oil & Gas Operator | Sep 2015 |
| 20326 | Nytex Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2014 |
| 20327 | Nytex, L.L.C. | Edmond, OK 73083 | Oil & Gas Operator | Feb 2006 |
| 20328 | Nytis Exploration Company LLC | Lexington, KY 40509 | Oil & Gas Operator | Dec 2021 |
| 20329 | NZ Operating Company Inc. | Houston, TX 77069 | Oil & Gas Operator | Jun 2026 |
| 20330 | O & G Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Oct 1996 |
| 20331 | O & O Operators, LLC. | Fate, TX 75132 | Oil & Gas Operator | Jun 2026 |
| 20332 | O G & E | Oklahoma City, OK 73124 | Oil & Gas Operator | Feb 2014 |
| 20333 | O H Berry | Midland, TX 79702 | Oil & Gas Operator | Feb 2003 |
| 20334 | O Hill Enterprises, Inc. | La Grange, TX 78945 | Oil & Gas Operator | Jan 2014 |
| 20335 | O I L Energy Corp | | Oil & Gas Operator | Oct 2017 |
| 20336 | O I L Niagaran LLC | | Oil & Gas Operator | May 2017 |
| 20337 | O K Swabbing Inc | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2026 |
| 20338 | O S & J Operatin | | Oil Operator | Nov 1984 |
| 20339 | O S & S Oil Company | Electra, TX 76360 | Oil & Gas Operator | Jan 2018 |
| 20340 | O&G Investments Inc. | Runge, TX 78151 | Oil & Gas Operator | Feb 2003 |
| 20341 | O'Bar Operating Co., Inc. | Longview, TX 75604 | Oil & Gas Operator | Jun 2026 |
| 20342 | O'Benco, Inc. | Shreveport, LA 71136 | Oil & Gas Operator | Jun 2026 |
| 20343 | O'Blue Corp. | Kerrville, TX 78028 | Oil & Gas Operator | Mar 1998 |
| 20344 | O'Boyle Energy Corporation | | Oil Operator | Feb 1991 |
| 20345 | O'Brien Energy Company | Shreveport, LA 71136 | Oil & Gas Operator | Sep 2019 |
| 20346 | O'Brien Energy Resources Corp | Portsmouth, NH 03801 | Oil & Gas Operator | Jun 2026 |
| 20347 | O'Brien Oil Corporation | Guthrie, OK 73044-3154 | Oil & Gas Operator | Feb 2026 |
| 20348 | O'Brien Oil LLC | Guthrie, OK 73044-3154 | Oil & Gas Operator | Apr 2020 |
| 20349 | O'Brien Operating Company | Shreveport, LA 71164 | Oil & Gas Operator | Dec 2004 |
| 20350 | O'Brien Resources LLC | Shreveport, LA 71136 | Oil Operator | Nov 2017 |
| 20351 | O'Brien, George H. Jr. | Midland, TX 79701 | Oil & Gas Operator | Jun 1994 |
| 20352 | O'Brien, Owen | Saint Paul, KS 66771 | Oil Operator | Jan 2026 |
| 20353 | O'Brien-Sill | | Oil & Gas Operator | Mar 2026 |
| 20354 | O'Connell, James P. | Vacaville, CA 95687 | Oil Operator | Nov 2009 |
| 20355 | O'Connor & Hewitt, LTD. | Victoria, TX 77901 | Oil & Gas Operator | Jun 1998 |
| 20356 | O'Connor Energy Management, LLC | Victoria, TX 77902 | Oil Operator | Jun 2026 |
| 20357 | O'Connor, Emma | Hamburg, NY 14075 | Gas Operator | Dec 2024 |
| 20358 | O'Dell, Mitchell | Cross Plains, TX 76443 | Oil & Gas Operator | Jun 2026 |
| 20359 | O'Donnell Bill C | Tulsa, OK 74135-4241 | Oil & Gas Operator | Oct 2014 |
| 20360 | O'Donnell Oil LLC | | Oil & Gas Operator | Dec 2025 |
| 20361 | O'Donohoe, Jack | Wichita Falls, TX 76301 | Oil & Gas Operator | May 2002 |
| 20362 | O'Gorman, Brendan & Wheeler, Anne | North Collins, NY 14111 | Gas Operator | Dec 2024 |
| 20363 | O'Gorman, Kevin | Eden, NY 14057 | Gas Operator | Dec 2024 |
| 20364 | O'Hare Energy Co | | Oil Operator | Dec 1983 |
| 20365 | O'Hern Morris D | Mounds, OK 74047-5163 | Oil & Gas Operator | Sep 2016 |
| 20366 | O'Leary'S Oil & Gas Inc. | Arcadia, FL 34266 | Oil & Gas Operator | May 2008 |
| 20367 | O'Malley Production Co Inc. | | Oil & Gas Operator | Mar 1988 |
| 20368 | O'Meara LLC | | Oil & Gas Operator | Oct 2022 |
| 20369 | O'Meara, Inc. | | Oil & Gas Operator | Dec 2006 |
| 20370 | O'Neal Cattle Co. | Pampa, TX 79066 | Gas Operator | Jun 2026 |
| 20371 | O'Neal Oil & Gas Co | Fort Worth, TX 76107-1479 | Oil & Gas Operator | Mar 2026 |
| 20372 | O'Neal Oil Company | Nocona, TX 76255 | Oil & Gas Operator | Jun 2026 |
| 20373 | O'Neal Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 1999 |
| 20374 | O'Neal, Lindell | Nocona, TX 76255 | Oil & Gas Operator | Feb 2026 |
| 20375 | O'Neil Properties LTD | Midland, TX 79702 | Oil & Gas Operator | Jun 2015 |
| 20376 | O'Neil, Pat | Wichita Falls, TX 76308 | Oil & Gas Operator | Nov 2005 |
| 20377 | O'Neill Properties, LTD. | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 20378 | O'Ryan Oil And Gas | Odessa, TX 79768 | Oil & Gas Operator | Jun 2026 |
| 20379 | O'Sand Production, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Aug 2003 |
| 20380 | O'Sullivan & Scully, Inc. | | Oil & Gas Operator | Oct 1994 |
| 20381 | O'Sullivan Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2000 |
| 20382 | O'Tool Oil & Gas, LLC | Dallas, TX 75205 | Oil & Gas Operator | Jun 2026 |
| 20383 | O. B. And Keith Whatley | | Oil Operator | Jul 1993 |
| 20384 | O. B. Beck | | Oil Operator | Feb 1991 |
| 20385 | O. B. Mobley | | Oil & Gas Operator | Jul 1989 |
| 20386 | O. B. Mobley, Et Al | | Oil Operator | Jul 1989 |
| 20387 | O. B. Whatley | | Oil Operator | Jul 1993 |
| 20388 | O. D. Maybrier | | Oil Operator | Dec 2011 |
| 20389 | O. F. H., Inc. | | Oil Operator | May 1990 |
| 20390 | O. G., Inc. | | Oil & Gas Operator | Nov 1992 |
| 20391 | O. H. B. Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Sep 2019 |
| 20392 | O. H. M. Operating | Pampa, TX 79065 | Oil & Gas Operator | Jun 2026 |
| 20393 | O. O. Cummings | | Gas Operator | Jan 1999 |
| 20394 | O.B. Whatley Oil Company, Inc. | | Oil Operator | Feb 2013 |
| 20395 | O.B., Keith & Owen B. Whatley | | Oil Operator | Jul 1989 |
| 20396 | O.G.O. Refining | Luling, TX 78648 | Oil & Gas Operator | Jun 2013 |
| 20397 | O.G.P. Operating, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Jun 2026 |
| 20398 | O.I.L. Energy, Inc. | | Oil & Gas Operator | Dec 1984 |
| 20399 | O.T. Oil | Kilgore, TX 75663 | Oil Operator | Jun 2026 |
| 20400 | O7 Saltwater Disposal LLC | Marietta, OK 73448 | Oil Operator | Feb 2026 |