| 101 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 102 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 103 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 104 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 105 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Oct 2025 |
| 106 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jul 2025 |
| 107 | Cordillera Energy Partners LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 108 | Coronado Petroleum Corporation | Oklahoma City, OK 73102-4803 | Oil & Gas Operator | Jul 2025 |
| 109 | Covington Oil Company Inc | Nichols Hills, OK 73116 | Oil & Gas Operator | Jun 2025 |
| 110 | Cox Robert L | Blackwell, OK 74631 | Oil & Gas Operator | Mar 2025 |
| 111 | CPRC Inc | Tulsa, OK 74103-5037 | Oil & Gas Operator | Apr 1997 |
| 112 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 113 | Culp & Copple Oil Company | Cushing, OK 74023 | Oil & Gas Operator | Jun 2025 |
| 114 | Dar-Lon Operating Company | Lamont, OK 74643 | Oil & Gas Operator | Oct 2000 |
| 115 | Darco Petroleum, Inc. | Bartlesville, OK 74005 | Oil & Gas Operator | Dec 2020 |
| 116 | Darling Dan Oil | | Oil & Gas Operator | Sep 2018 |
| 117 | Darling Oil Corporation | Lamont, OK 74643 | Oil & Gas Operator | Jul 2025 |
| 118 | David E Morgan Inc | Danville, CA 94506-2035 | Oil & Gas Operator | Jul 2025 |
| 119 | Davis Bros. Oil Producers, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2020 |
| 120 | Davis, Joe D. | Fort Smith, AR 72903 | Gas Operator | Mar 2015 |
| 121 | Dawson-Markwell Exploration Co. | Oklahoma City, OK 73101 | Oil & Gas Operator | Jun 2025 |
| 122 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 123 | Delong Oil & Gas Services, Inc. | Cushing, OK 74023 | Oil & Gas Operator | Dec 2024 |
| 124 | Demco Oil & Gas Company | Blackwell, OK 74631-4203 | Oil & Gas Operator | Jun 2025 |
| 125 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 126 | Devon Resources Corporation | Jenks, OK 74037-3525 | Oil & Gas Operator | May 2025 |
| 127 | Diamond Cross Oil Co LLC | Ponca City, OK 74601-1104 | Oil & Gas Operator | Jun 2025 |
| 128 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Oct 2025 |
| 129 | DMS Investments Inc | Tulsa, OK 74132-2690 | Oil & Gas Operator | Mar 2015 |
| 130 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 131 | Donray Petroleum LLC | Choctaw, OK 73020 | Oil & Gas Operator | Jun 2025 |
| 132 | Drake Exploration LLC | Arkansas City, KS 67005 | Oil & Gas Operator | Jun 2025 |
| 133 | Dundee Oil & Supply Inc | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2001 |
| 134 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 135 | Dyno Energy LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jun 2025 |
| 136 | Eagle River Energy Corporation | Broken Arrow, OK 74011 | Oil & Gas Operator | Jun 2025 |
| 137 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Jun 2025 |
| 138 | Eberle C Fred | Blackwell, OK 74631 | Oil Operator | Jun 1993 |
| 139 | Edmonds Management Company | Richardson, TX 75081 | Oil & Gas Operator | Mar 2015 |
| 140 | Egan Resources Inc. | Katy, TX 77494 | Oil & Gas Operator | Oct 2016 |
| 141 | Egret Operating Company | Muskogee, OK 74401 | Oil & Gas Operator | Jun 2025 |
| 142 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Jul 2025 |
| 143 | Empire Petroleum LLC | Salt Lake City, UT 84121-7021 | Oil & Gas Operator | Jun 2019 |
| 144 | Enmark Gas Gathering L. P. | Dallas, TX 75252 | Oil & Gas Operator | May 2025 |
| 145 | Eratz Investments Inc. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 146 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 147 | Exok, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Jun 2025 |
| 148 | Explo Oil, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Oct 2025 |
| 149 | Exploration Associates II LLC | Oklahoma City, OK 73102-8815 | Oil & Gas Operator | Jan 2013 |
| 150 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 151 | F Davis Oil & Gas LLC | Cleveland, OK 74020 | Oil Operator | Apr 2025 |
| 152 | Fairchild Well Service Inc | Ponca City, OK 74602-0470 | Oil & Gas Operator | Jun 2006 |
| 153 | Faulkner Corporation | Oklahoma City, OK 73154-9704 | Oil & Gas Operator | Jan 2017 |
| 154 | Finlay Energy, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Jul 1999 |
| 155 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Oct 2025 |
| 156 | Flatlander Energy LLC | Blackwell, OK 74631 | Oil & Gas Operator | Jul 2025 |
| 157 | Flynn Energy Corporation | Tulsa, OK 74137 | Oil & Gas Operator | Mar 1993 |
| 158 | Ford Tank Truck Service | | Oil Operator | Jan 2022 |
| 159 | Forest 1 Development Company | Denver, CO 80202-4966 | Oil & Gas Operator | Mar 2008 |
| 160 | Fossil Creek Resources LLC | Arlington, TX 76011-5597 | Oil & Gas Operator | Mar 2015 |
| 161 | Fox Jr Jimmy D | Bartlesville, OK 74003 | Oil & Gas Operator | Nov 2005 |
| 162 | Franklin Donna | Gotebo, OK 73041 | Oil & Gas Operator | Jun 2025 |
| 163 | Fremont Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2004 |
| 164 | Fremont Exploration, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2014 |
| 165 | G & C Petroleum Inc | Yale, OK 74085-2502 | Oil & Gas Operator | Jun 2025 |
| 166 | G A W Oil Company LLC | Enid, OK 73702-3926 | Oil & Gas Operator | Jul 2025 |
| 167 | Ganer Mark Oil & Gas | Owasso, OK 74055 | Oil & Gas Operator | Aug 2005 |
| 168 | Ganer Oil Company | Blackwell, OK 74631-4221 | Oil & Gas Operator | Jan 2022 |
| 169 | Garry Davis Oil LLC | Tonkawa, OK 74653-0040 | Oil & Gas Operator | Jul 2025 |
| 170 | Geo American Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 171 | Geo-Earth Exploration Co Inc | Stillwater, OK 74076 | Oil & Gas Operator | May 1994 |
| 172 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 173 | Geological & Engineering Consultants | | Oil & Gas Operator | Jun 2025 |
| 174 | Glacier Petroleum Co Okla Inc | Edmond, OK 73013-1977 | Oil & Gas Operator | Jul 2025 |
| 175 | GLB Exploration, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 176 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2025 |
| 177 | GLM Energy Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Jul 2025 |
| 178 | Golden Gas Production Company | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 179 | Grace 7 Operating LLC | Argyle, TX 76226 | Oil Operator | Apr 2022 |
| 180 | Grand Resources Inc | Tulsa, OK 74137 | Oil & Gas Operator | Oct 2025 |
| 181 | Gray Lloyd Energy Inc | Oklahoma City, OK 73120-8112 | Oil & Gas Operator | Nov 2005 |
| 182 | Grayhorse Operating Inc | Tulsa, OK 74103-4439 | Oil & Gas Operator | Jun 2025 |
| 183 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 184 | Green Operating Company, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2025 |
| 185 | Greer Family Trust | Ponca City, OK 74601-8126 | Oil Operator | Aug 2018 |
| 186 | Guest Petroleum Incorporated | Edmond, OK 73013 | Oil & Gas Operator | Jul 2025 |
| 187 | Guest R E Oil Producer | Edmond, OK 73083-0805 | Oil & Gas Operator | Mar 2015 |
| 188 | Hadaway Consulting And Engineering LLC | Canadian, TX 79014 | Oil & Gas Operator | Jul 2025 |
| 189 | Hallco Petroleum Inc | Oklahoma City, OK 73106-5224 | Oil Operator | Aug 2018 |
| 190 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 191 | Hamon Jake L | Dallas, TX 75201-3902 | Oil & Gas Operator | Nov 1997 |
| 192 | Hamp Oil | Ponca City, OK 74604 | Oil & Gas Operator | Sep 2002 |
| 193 | Har-Ken Oil Co | | Oil & Gas Operator | Dec 2021 |
| 194 | Hargraves Elston | Ponca City, OK 74604 | Oil & Gas Operator | Jul 2003 |
| 195 | Hazelwood Prod & Exp Co LLC | Oklahoma City, OK 73116-9037 | Oil & Gas Operator | Jun 2025 |
| 196 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 197 | Heath Oil Co., Inc. | Washington, OK 73093-4702 | Oil & Gas Operator | Jun 2025 |
| 198 | Hewitt Energy Group, Inc. | Salt Lake City, UT 84111 | Oil & Gas Operator | Apr 2015 |
| 199 | Hodgden Operating Co., Inc. | Enid, OK 73702 | Oil & Gas Operator | Jul 2025 |
| 200 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |