| 101 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Jul 2025 |
| 102 | Chisos Exploration Inc | Enid, OK 73703 | Oil & Gas Operator | Dec 2004 |
| 103 | Choctaw Gas Company | Quinton, OK 74561 | Gas Operator | Apr 2025 |
| 104 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 105 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 106 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Jul 2025 |
| 107 | Cities Services Company | | Oil & Gas Operator | Mar 2008 |
| 108 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 109 | Cleveland Rod & Tracy | Elmore City, OK 73433-9467 | Oil & Gas Operator | Jul 2023 |
| 110 | Clinton Public Works Authority | Clinton, OK 73601 | Oil & Gas Operator | May 2023 |
| 111 | CM Exploration Company Inc. | | Oil & Gas Operator | Apr 2009 |
| 112 | Coaleum Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jan 2001 |
| 113 | Cola Resources LLC | Houston, TX 77019-5639 | Gas Operator | Nov 2015 |
| 114 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 115 | Concorde Resources Corporation | Eufaula, OK 74432 | Oil & Gas Operator | Apr 2025 |
| 116 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 117 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 118 | Continental Gas Inc | Enid, OK 73702-5103 | Oil & Gas Operator | Apr 2012 |
| 119 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Jul 2025 |
| 120 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Jul 2025 |
| 121 | Cordillera Energy Partners LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 122 | Corman, Jack | Dallas, TX 75231 | Oil & Gas Operator | May 2022 |
| 123 | Corterra Energy Operating LLC | Tulsa, OK 74119-4844 | Oil & Gas Operator | Aug 2021 |
| 124 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 125 | County Line Stripper Wells LLC | Chelsea, OK 74016 | Oil & Gas Operator | Mar 2025 |
| 126 | Cove Petroleum Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2020 |
| 127 | Cox Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2014 |
| 128 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 129 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 130 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 131 | Crow Creek Operating Co III LLC | Tulsa, OK 74137-8432 | Oil & Gas Operator | Apr 2015 |
| 132 | Cyanostar Energy, Inc | Tulsa, OK 74103-4122 | Oil & Gas Operator | Sep 2001 |
| 133 | D-Pex Operating Company | | Oil & Gas Operator | Sep 2004 |
| 134 | D.J.F. Services, Inc. | Holdenville, OK 74848 | Oil & Gas Operator | Jul 2025 |
| 135 | Daniel Resource Dev Inc | Tomball, TX 77375-8919 | Oil & Gas Operator | Oct 2009 |
| 136 | Daniel-Price Exploration Co | Tulsa, OK 74119 | Gas Operator | Apr 2011 |
| 137 | Davis Charles K | Morris, OK 74445-2201 | Oil & Gas Operator | Apr 2015 |
| 138 | Davis Operating Company | Elysian Field, TX 75642 | Oil & Gas Operator | Jul 2025 |
| 139 | Davis, Joe D. | Fort Smith, AR 72903 | Gas Operator | Mar 2015 |
| 140 | Deep Rock LLC | Tulsa, OK 74137-1612 | Gas Operator | Jun 2022 |
| 141 | Deisenroth M Craig | Tulsa, OK 74104-6511 | Oil & Gas Operator | Feb 2025 |
| 142 | Derrick Resources Inc. | Henryetta, OK 74437-4249 | Oil & Gas Operator | Apr 2025 |
| 143 | Dette Oil Corporation | Oklahoma City, OK 73162-6249 | Oil & Gas Operator | Oct 2015 |
| 144 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 145 | Devon Energy Operating Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2013 |
| 146 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 147 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 148 | Dexxon, Inc. | Kiefer, OK 74041 | Oil & Gas Operator | Apr 2025 |
| 149 | Diamond A Inc. | Tulsa, OK 74137 | Oil & Gas Operator | Jun 2001 |
| 150 | DLKB Operating LLC | Eufaula, OK 74432 | Gas Operator | Apr 2025 |
| 151 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 152 | Dominion Exp Midcontinent Inc | Oklahoma City, OK 73134-2616 | Oil & Gas Operator | Oct 2024 |
| 153 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 154 | Donovan Joe D Or L P McElwaine | Tulsa, OK 74119 | Gas Operator | Jan 2014 |
| 155 | Douglass Dietz & Daley Inc | Oklahoma City, OK 73154-0125 | Oil & Gas Operator | Aug 2023 |
| 156 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 157 | Drake Exploration Inc | Tulsa, OK 74105-4250 | Oil & Gas Operator | May 2025 |
| 158 | Duncan Jr J Walter | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2016 |
| 159 | Dune Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jan 1993 |
| 160 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 161 | Dyne Exploration Company | Plano, TX 75093-6512 | Oil & Gas Operator | Apr 2020 |
| 162 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2025 |
| 163 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Apr 2025 |
| 164 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Apr 2025 |
| 165 | Echo E & P LLC | Oklahoma City, OK 73102-6439 | Oil & Gas Operator | Apr 2025 |
| 166 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 167 | Edwards & Leach Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2005 |
| 168 | Edwards Oil & Gas Company | Oklahoma City, OK 73156-0386 | Oil & Gas Operator | Mar 2015 |
| 169 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 170 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | May 2025 |
| 171 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Apr 2025 |
| 172 | Ells Jr Harry A | Englewood, CO 80150 | Gas Operator | Feb 2017 |
| 173 | Enable Gas Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 174 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | May 2025 |
| 175 | Enerfin Resources I Limited Partnership | Houston, TX 77077-2386 | Oil & Gas Operator | Apr 2023 |
| 176 | Energas Corporation | Oklahoma City, OK 73105 | Oil & Gas Operator | Feb 2025 |
| 177 | Enersource Royalty Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2013 |
| 178 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 179 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 180 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 181 | Esco Exploration, Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 182 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 183 | Evans Production Co. | Pampa, TX 79066 | Oil & Gas Operator | Sep 2020 |
| 184 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 185 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | May 2025 |
| 186 | Fairway Resources Operating III LLC | Houston, TX 77002-2728 | Oil & Gas Operator | Apr 2025 |
| 187 | Faith Production LLC | Holdenville, OK 74848 | Oil & Gas Operator | May 2025 |
| 188 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 189 | Faulkner Corporation | Oklahoma City, OK 73154-9704 | Oil & Gas Operator | Jan 2017 |
| 190 | Ferguson Oil Company Inc | | Oil & Gas Operator | Apr 1994 |
| 191 | First Natural Gas Inc | Checotah, OK 74426 | Oil & Gas Operator | May 2025 |
| 192 | Flagin Operating LLC | Norman, OK 73072-2405 | Oil & Gas Operator | Apr 2025 |
| 193 | Focus Energy, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2019 |
| 194 | Foree Oil Company | Terrell, TX 75160 | Oil & Gas Operator | Jul 2025 |
| 195 | Foreman Enterprises, Inc. | Edmond, OK 73003 | Oil & Gas Operator | May 2025 |
| 196 | Fortuna Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2014 |
| 197 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Jul 2025 |
| 198 | Four Brothers Inc | | Oil & Gas Operator | Jan 2020 |
| 199 | FP Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2008 |
| 200 | Frisco Energy, L.L.C. | Tulsa, OK 74105 | Oil & Gas Operator | May 2025 |