| 101 | Coastal Oils Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2013 |
| 102 | Coastal States Gas Prod. Co. | | Oil & Gas Operator | Jun 1996 |
| 103 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 104 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 105 | Combest A L | Purcell, OK 73080-6829 | Oil & Gas Operator | Aug 2021 |
| 106 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2025 |
| 107 | Compadre Drilling & Expl Corp | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2015 |
| 108 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 109 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 110 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 111 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 112 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 113 | Consolidated Peto Equity LTD | La Crescenta, CA 91214 | Oil & Gas Operator | Dec 1996 |
| 114 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Jul 2025 |
| 115 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Jul 2025 |
| 116 | Corner Energy LLC | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Mar 2015 |
| 117 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 118 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | May 2025 |
| 119 | Czar Resources Inc | Houston, TX 77060 | Oil & Gas Operator | Oct 1992 |
| 120 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 121 | D.J.F. Services, Inc. | Holdenville, OK 74848 | Oil & Gas Operator | Jul 2025 |
| 122 | Dale George | Elmore City, OK 73433 | Oil & Gas Operator | Aug 2022 |
| 123 | Dale Jimmy | Davis, OK 73030 | Oil & Gas Operator | Mar 2015 |
| 124 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 125 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 126 | Darrell'S Drilling Inc | Konawa, OK 74849 | Oil Operator | Apr 2025 |
| 127 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Jul 2025 |
| 128 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Apr 2025 |
| 129 | Dean'S Well Servicing Inc | Ratliff City, OK 73481 | Oil & Gas Operator | May 2025 |
| 130 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 131 | Deka Exploration Inc | Oklahoma City, OK 73113-0057 | Oil & Gas Operator | Nov 2019 |
| 132 | Denveramerican Petro LLC | | Oil & Gas Operator | May 2006 |
| 133 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 134 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 135 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 136 | Devon Resources Corporation | Jenks, OK 74037-3525 | Oil & Gas Operator | Apr 2025 |
| 137 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 138 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 139 | Doco Development Corporation | Norman, OK 73072 | Oil & Gas Operator | May 2025 |
| 140 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 141 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 142 | Douglass Dietz & Daley Inc | Oklahoma City, OK 73154-0125 | Oil & Gas Operator | Aug 2023 |
| 143 | DRG Energy Inc | Norman, OK 73026-3171 | Oil & Gas Operator | Apr 2025 |
| 144 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 145 | DSM Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | May 1996 |
| 146 | Duncan Oil & Gas Inc | Norman, OK 73072 | Oil & Gas Operator | Sep 2020 |
| 147 | Dune Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jan 1993 |
| 148 | E Lyle Johnson Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Apr 2025 |
| 149 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Apr 2025 |
| 150 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Apr 2025 |
| 151 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 152 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 153 | Eec Inc | Norman, OK 73069-6344 | Oil & Gas Operator | May 2025 |
| 154 | Egolf Operating Company | Oklahoma City, OK 73114-7899 | Oil & Gas Operator | Apr 1998 |
| 155 | Ekg Operating Inc | Seminole, OK 74818-1028 | Oil & Gas Operator | Nov 2015 |
| 156 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 157 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | May 2025 |
| 158 | Elder & Vaughn Inc | Oklahoma City, OK 73154-0938 | Oil & Gas Operator | Mar 2008 |
| 159 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Apr 2025 |
| 160 | Encore Operating Inc | Edmond, OK 73013-5417 | Oil Operator | Apr 2025 |
| 161 | Endevco Eureka LLC | Oklahoma City, OK 73102-9211 | Oil & Gas Operator | Apr 2014 |
| 162 | Enerfin Resources I Limited Partnership | Houston, TX 77077-2386 | Oil & Gas Operator | Apr 2023 |
| 163 | Energas Corporation | Oklahoma City, OK 73105 | Oil & Gas Operator | Feb 2025 |
| 164 | Enersource Royalty Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2013 |
| 165 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 166 | Enterprising Enterprises Inc | Tulsa, OK 74137 | Oil Operator | Jun 2009 |
| 167 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 168 | EP Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 169 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | Apr 2025 |
| 170 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 171 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 172 | Excelco Energy Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Jul 2018 |
| 173 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 174 | Fairway Resources Operating III LLC | Houston, TX 77002-2728 | Oil & Gas Operator | Apr 2025 |
| 175 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Jul 2025 |
| 176 | Forest 1 Development Company | Denver, CO 80202-4966 | Oil & Gas Operator | Mar 2008 |
| 177 | Four Seas Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Dec 2019 |
| 178 | Fremont Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2004 |
| 179 | Fremont Exploration, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2014 |
| 180 | Frontier Operating Corporation | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 181 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 182 | Genesis Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 1995 |
| 183 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 184 | Glacier Petroleum Co Okla Inc | Edmond, OK 73013-1977 | Oil & Gas Operator | May 2025 |
| 185 | Gladiator Operating LLC | Ardmore, OK 73401 | Oil & Gas Operator | May 2025 |
| 186 | GLB Exploration, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 187 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2025 |
| 188 | Golden Gas Service Company | Tulsa, OK 74114 | Oil & Gas Operator | May 2025 |
| 189 | Grand Resources Inc | Tulsa, OK 74137 | Oil & Gas Operator | Jul 2025 |
| 190 | Great Horned Owls, LLC | Katy, TX 77494 | Oil & Gas Operator | May 2025 |
| 191 | Great Plains Pipeline Company | Tulsa, OK 74135-6405 | Oil & Gas Operator | Jul 2014 |
| 192 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 193 | Green River Operating Co Inc | Noble, OK 73068-5521 | Oil & Gas Operator | Feb 2018 |
| 194 | Green River Resources Inc. | Keystone, CO 80435 | Oil & Gas Operator | Jul 2025 |
| 195 | Greenlee Oil And Gas LLC | Norman, OK 73072 | Oil & Gas Operator | Apr 2025 |
| 196 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jun 2025 |
| 197 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 198 | H.L.S. Energy Co., Inc. | Uvalde, TX 78801 | Oil & Gas Operator | Aug 2003 |
| 199 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 200 | Hadson Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |