| 4001 | Neas Operating | Pampa, TX 79065 | Oil & Gas Operator | Oct 2011 |
| 4002 | Neg Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Nov 2024 |
| 4003 | Neilson Inc | Nash, OK 73761 | Oil & Gas Operator | Aug 2022 |
| 4004 | Nelco Oil & Gas | Duncan, OK 73533-1516 | Oil & Gas Operator | Oct 2015 |
| 4005 | Nelson Billy L Trust | Okmulgee, OK 74447-2047 | Oil & Gas Operator | Feb 2015 |
| 4006 | Nelson Exploration Corporation | Cleveland, OK 74020-5725 | Oil & Gas Operator | Apr 2025 |
| 4007 | Nemaha Environmental Services LLC | Kremlin, OK 73753 | Oil Operator | Nov 2024 |
| 4008 | Neodyne Drilling Corporation | Tulsa, OK 74153-0326 | Oil & Gas Operator | Apr 2020 |
| 4009 | Neok Production Company LLC | Nowata, OK 74048 | Oil & Gas Operator | Apr 2025 |
| 4010 | Neosho Operating Services LLC | Neosho, MO 64850-0179 | Oil Operator | Mar 2017 |
| 4011 | Nerco Oil & Gas, Inc. | | Oil & Gas Operator | Dec 1996 |
| 4012 | New Century Petroleum Corp | Oklahoma City, OK 73105 | Oil & Gas Operator | May 2013 |
| 4013 | New Dominion LLC | Tulsa, OK 74119-3220 | Oil & Gas Operator | Apr 2025 |
| 4014 | New Energy Corporation | Rancho Santa Fe, CA 92067-1990 | Oil & Gas Operator | Jul 2024 |
| 4015 | New Gulf Resources, LLC | Tulsa, OK 74133 | Oil & Gas Operator | May 2018 |
| 4016 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 4017 | New Lift Inc | Nowata, OK 74048-0245 | Oil & Gas Operator | Mar 2015 |
| 4018 | New London Oil Inc. | Houston, TX 77253 | Oil & Gas Operator | Aug 2002 |
| 4019 | Newco, Inc. | Oklahoma City, OK 73177 | Oil Operator | Aug 1999 |
| 4020 | Newell Oil And Gas LLC | Shawnee, OK 74801-5783 | Oil & Gas Operator | Apr 2025 |
| 4021 | Newkumet Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2020 |
| 4022 | Newpark Drilling Fluids LLC | Clinton, OK 73601 | Oil Operator | Dec 2013 |
| 4023 | Newpek, LLC | Irving, TX 75039 | Oil & Gas Operator | Sep 2016 |
| 4024 | Nexco Inc | Oklahoma City, OK 73102-6801 | Oil & Gas Operator | Nov 2013 |
| 4025 | Nexstreem Corporation | | Oil & Gas Operator | Dec 2020 |
| 4026 | Nexus Resources Corporation | Drumright, OK 74030 | Oil & Gas Operator | Jan 2013 |
| 4027 | NFC Petroleum Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1996 |
| 4028 | Nfcda Energy LLC | Edmond, OK 73013 | Oil & Gas Operator | May 2025 |
| 4029 | NHH Inc | Oklahoma City, OK 73162-7418 | Oil & Gas Operator | Feb 2002 |
| 4030 | Nichols Operating LLC | Fort Branch, IN 47648 | Oil & Gas Operator | Dec 2021 |
| 4031 | Nichols Water Service Inc | Forgan, OK 73938 | Oil & Gas Operator | May 2018 |
| 4032 | Nichols, Irl. A. Trust B | Duncan, OK 73534 | Oil & Gas Operator | Sep 2000 |
| 4033 | Nickell Oil Company | Walters, OK 73572 | Oil Operator | Apr 2018 |
| 4034 | Nickle Audrey O | Okmulgee, OK 74447-2823 | Oil & Gas Operator | Apr 2020 |
| 4035 | Nicor Supply Company | Golden, CO 80401 | Oil & Gas Operator | Jun 1993 |
| 4036 | Nielson & Associates Inc | Cody, WY 82414 | Oil & Gas Operator | Feb 2016 |
| 4037 | Nijean, Inc. | Shawnee, OK 74802 | Oil & Gas Operator | Feb 2012 |
| 4038 | Nitro Petroleum Inc | Phoenix, AZ 85016-4599 | Oil & Gas Operator | May 2020 |
| 4039 | Nivens Productions LLC | Coyle, OK 73027-9785 | Oil & Gas Operator | Aug 2024 |
| 4040 | Nixon Properties Inc | Tulsa, OK 74104 | Oil & Gas Operator | Aug 2023 |
| 4041 | Nject Disposal LLC | Houston, TX 77027 | Oil Operator | Mar 2017 |
| 4042 | Njre Operating Company | Tulsa, OK 74119 | Gas Operator | Dec 2016 |
| 4043 | NM&O Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 4044 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 4045 | Noble Energy Production Inc | Houston, TX 77067 | Oil & Gas Operator | Jul 2025 |
| 4046 | Noble Operating Company Inc | Garden City, KS 67846 | Oil & Gas Operator | Sep 2014 |
| 4047 | Noble Operating, LLC | Flower Mound, TX 75028 | Oil & Gas Operator | Sep 2013 |
| 4048 | Noble Resources Inc | Mannford, OK 74044 | Oil & Gas Operator | Apr 2025 |
| 4049 | Noco Investment Company Inc | Tulsa, OK 74159-0470 | Oil & Gas Operator | Mar 2005 |
| 4050 | Nogp Operating Company Inc | Frisco, TX 75033 | Oil & Gas Operator | Apr 2025 |
| 4051 | Nomoc Oil Company Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | May 2006 |
| 4052 | Nondorf Oil & Gas Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2008 |
| 4053 | Nooner Cynthia | Ratliff City, OK 73481 | Oil Operator | May 2025 |
| 4054 | Nordan Oil & Gas Corporation | Abilene, TX 79604 | Oil & Gas Operator | Feb 2018 |
| 4055 | Nordstrand Engineering Inc | Houston, TX 77019 | Oil & Gas Operator | Jul 2025 |
| 4056 | Norman Brothers Tank Truck Inc | Pauls Valley, OK 73075 | Oil & Gas Operator | May 2020 |
| 4057 | Norman Kenneth W | Sasakwa, OK 74867-0086 | Oil Operator | Oct 2017 |
| 4058 | Norman Oil Corporation | Abilene, TX 79608 | Oil & Gas Operator | Mar 2000 |
| 4059 | Norman Production Company | Chandler, OK 74834-8538 | Oil & Gas Operator | May 2015 |
| 4060 | Nortex Gas & Oil Co | Tulsa, OK 74135 | Oil & Gas Operator | Sep 1993 |
| 4061 | North American Energy Inc | Duncan, OK 73533-9604 | Oil & Gas Operator | Nov 2000 |
| 4062 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 4063 | North Bound Exploration Co | Pauls Valley, OK 73075-0863 | Oil & Gas Operator | Jan 2018 |
| 4064 | North Canadian Production LLC | Okemah, OK 74859 | Oil Operator | Apr 2025 |
| 4065 | North Lake Resources LLC | Oklahoma City, OK 73132 | Oil & Gas Operator | Jul 2025 |
| 4066 | North Star Exploration Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 4067 | North Star Petroleum Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Oct 1993 |
| 4068 | Northam Oil Company Inc | Ada, OK 74820-3334 | Oil & Gas Operator | Feb 2025 |
| 4069 | Northbrook Oil & Gas Co LLC | Norman, OK 73072 | Oil & Gas Operator | Nov 2014 |
| 4070 | Northbrook Oil & Gas Company | Norman, OK 73070-4916 | Oil & Gas Operator | Jun 2016 |
| 4071 | Northcote Cleveland LLC | Borger, TX 79008 | Oil & Gas Operator | Mar 2025 |
| 4072 | Northeast Shelf Energy, L.L.C. | | Oil & Gas Operator | Jun 2017 |
| 4073 | Northern Pump Company | Denver, CO 80202-3130 | Oil & Gas Operator | Feb 2006 |
| 4074 | Northport Production Company | Oklahoma City, OK 73113 | Oil & Gas Operator | May 2025 |
| 4075 | Northwest Disposal Corporation | Laverne, OK 73848-0504 | Oil & Gas Operator | Jul 2014 |
| 4076 | Northwest Exploration Co | Salt Lake City, UT 84108-0900 | Oil & Gas Operator | Sep 1991 |
| 4077 | Northwest Oil Company | Dallas, TX 75204 | Oil & Gas Operator | Jun 2014 |
| 4078 | Northwind Development Company | | Oil Operator | Oct 1995 |
| 4079 | Northwind Oil Company | Tulsa, OK 74137 | Oil & Gas Operator | May 1998 |
| 4080 | Nossaman E Oil Inc | Del City, OK 73155-5449 | Oil Operator | Oct 2002 |
| 4081 | Notting Hill Energy LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Jul 2025 |
| 4082 | Nova Energy Corporation | Denver, CO 80201 | Oil & Gas Operator | Jun 2003 |
| 4083 | Novy Oil & Gas, Inc. | Goddard, KS 67052 | Oil & Gas Operator | Jun 2025 |
| 4084 | Nowata Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Sep 1997 |
| 4085 | Nowata Petroleum Operating Co | Nowata, OK 74048-9617 | Oil Operator | Aug 2014 |
| 4086 | NRG Oil LLC | Stratford, OK 74872-9732 | Oil Operator | Feb 2012 |
| 4087 | NS Oil LLC | Minneapolis, MN 55410 | Oil Operator | Apr 2025 |
| 4088 | NTR Energy LLC (Osage Cty Only) | | Oil & Gas Operator | Apr 2020 |
| 4089 | Nub'S Well Servicing Inc | Ratliff City, OK 73481 | Oil & Gas Operator | May 2025 |
| 4090 | Nutt Jerrie | Duncan, OK 73534-0698 | Oil & Gas Operator | Nov 2016 |
| 4091 | NV O&G Investments LLC /Osage Only | | Oil Operator | Sep 2022 |
| 4092 | NWM Operating Inc | Okeene, OK 73763 | Oil & Gas Operator | Apr 2025 |
| 4093 | NWM Properties LLC | Tulsa, OK 74131-4426 | Oil Operator | May 2025 |
| 4094 | Nyc Resources LTD | Tulsa, OK 74133-5700 | Oil & Gas Operator | Sep 2014 |
| 4095 | Nye Oil Company | Oklahoma City, OK 73118-1245 | Oil & Gas Operator | Jun 2004 |
| 4096 | Nytex Energy LLC | Edmond, OK 73083-5946 | Oil & Gas Operator | Sep 2015 |
| 4097 | Nytex, L.L.C. | Edmond, OK 73083 | Oil & Gas Operator | Feb 2006 |
| 4098 | O G & E | Oklahoma City, OK 73124 | Oil & Gas Operator | Feb 2014 |
| 4099 | O K Swabbing Inc | Hennessey, OK 73742 | Oil & Gas Operator | Apr 2025 |
| 4100 | O'Blue Corp. | Kerrville, TX 78028 | Oil & Gas Operator | Mar 1998 |