| 101 | Carney A B | | Oil & Gas Operator | Jan 2014 |
| 102 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Jan 2025 |
| 103 | Chambers Jerry Expl Co | | Oil & Gas Operator | Sep 2000 |
| 104 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Jan 2025 |
| 105 | Chesapeake Energy MKT Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2022 |
| 106 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2025 |
| 107 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Mar 2025 |
| 108 | Christeve Oil Company, Inc. | Houston, TX 77068 | Oil & Gas Operator | Dec 2022 |
| 109 | Cig Exploration Inc | Houston, TX 77046 | Oil & Gas Operator | Nov 1999 |
| 110 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Mar 2025 |
| 111 | Cimarex Energy Co Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Mar 2025 |
| 112 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 113 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Mar 2025 |
| 114 | Citizen Energy III LLC | Devner, CO 80202 | Oil & Gas Operator | Jan 2025 |
| 115 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 116 | Clements Exploration Co | Oklahoma City, OK 73132-5922 | Oil & Gas Operator | Jan 2006 |
| 117 | Clemishire Don | Hominy, OK 74035 | Oil & Gas Operator | Jan 2025 |
| 118 | Clinton Public Works Authority | Clinton, OK 73601 | Oil & Gas Operator | May 2023 |
| 119 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 120 | Coaleum Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jan 2001 |
| 121 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 122 | Cobopco Inc | Tulsa, OK 74103-4391 | Oil & Gas Operator | Feb 1997 |
| 123 | Cochran Industrial Corporation | Cushing, OK 74023-1427 | Oil & Gas Operator | Apr 2001 |
| 124 | Cogburn Oil Co Inc | | Oil & Gas Operator | Sep 2023 |
| 125 | Coho Oil & Gas Inc | Coppell, TX 75019-8288 | Oil & Gas Operator | Mar 2015 |
| 126 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 127 | Columbus Energy, LLC | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 128 | Comanche Exploration Co LLC | Oklahoma City, OK 73116-7334 | Oil & Gas Operator | Jan 2025 |
| 129 | Comanche Resources Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2025 |
| 130 | Complete Energy Services LLC | Gainesville, TX 76240 | Oil Operator | Aug 2022 |
| 131 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 132 | Confederate Spooling Inc | Okemah, OK 74859-2409 | Oil & Gas Operator | Apr 2020 |
| 133 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 134 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 135 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Mar 2025 |
| 136 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 137 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Mar 2025 |
| 138 | Continuum Midstream LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2024 |
| 139 | Cooper Operating LLC | Yukon, OK 73099 | Oil & Gas Operator | Jan 2025 |
| 140 | Cooper Production Company | New Braunfels, TX 78132 | Oil & Gas Operator | Sep 2021 |
| 141 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 142 | Cordillera Energy Partners LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 143 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 144 | CP Energy LLC | Edmond, OK 73034 | Oil Operator | Jan 2025 |
| 145 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 146 | Crescendo Resources, L.P. | Amarillo, TX 79188 | Oil & Gas Operator | Dec 2024 |
| 147 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2025 |
| 148 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2024 |
| 149 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 150 | Crow Oil LLC | Tulsa, OK 74133-2914 | Oil & Gas Operator | Sep 2019 |
| 151 | Crude Marketing & Trans Inc | Tulsa, OK 74159 | Oil & Gas Operator | Sep 2017 |
| 152 | Curzon Operating Company LTD | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Dec 2024 |
| 153 | D & D Pipe & Equipment Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2005 |
| 154 | D & J Oil Co | Kermit, TX 79745 | Oil & Gas Operator | Mar 2025 |
| 155 | Daco, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Mar 2025 |
| 156 | Dalen Resources Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 157 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 158 | Darnell Alma | Bristow, OK 74010 | Oil & Gas Operator | Jun 2000 |
| 159 | Daube Company The | Ardmore, OK 73401 | Oil & Gas Operator | Jan 2025 |
| 160 | Davco Productions Inc | Springer, OK 73458-8191 | Oil & Gas Operator | Jun 2021 |
| 161 | Davis J L | | Oil & Gas Operator | Aug 2006 |
| 162 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Dec 2024 |
| 163 | Decalta International Corp | Denver, CO 80202 | Oil & Gas Operator | Mar 2015 |
| 164 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 165 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 166 | Devon Gas Services, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2023 |
| 167 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 168 | Di Energy Inc. | Houston, TX 77067 | Oil & Gas Operator | Jan 2004 |
| 169 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Mar 2025 |
| 170 | DLB Energy Corporation | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Dec 2014 |
| 171 | Dominion Exp Midcontinent Inc | Oklahoma City, OK 73134-2616 | Oil & Gas Operator | Oct 2024 |
| 172 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 173 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 174 | Dorchester Minerals Operating LP | Dallas, TX 75219 | Oil & Gas Operator | Jun 2022 |
| 175 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 176 | DRG Energy Inc | Norman, OK 73026-3171 | Oil & Gas Operator | Dec 2024 |
| 177 | Duncan Jr J Walter | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2016 |
| 178 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 179 | Duncan Walter | | Oil & Gas Operator | May 2019 |
| 180 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 181 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2025 |
| 182 | Eagle Energy PTR I LP | Houston, TX 77064 | Oil & Gas Operator | Feb 2015 |
| 183 | Eagle Gas Marketing Co | Oklahoma City, OK 73114-2202 | Oil & Gas Operator | Nov 2022 |
| 184 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Mar 2025 |
| 185 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Dec 2024 |
| 186 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2025 |
| 187 | Egolf Operating Company | Oklahoma City, OK 73114-7899 | Oil & Gas Operator | Apr 1998 |
| 188 | Ehvi Exploration LLC | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2025 |
| 189 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 190 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jan 2025 |
| 191 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Jan 2025 |
| 192 | Enable Gas Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 193 | Encana Energy Resources Inc | Denver, CO 80202-2828 | Oil & Gas Operator | Feb 2024 |
| 194 | Encino Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 195 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Jan 2025 |
| 196 | Energy Transfer Crude Marketing LLC | Houston, TX 77002 | Oil Operator | Dec 2024 |
| 197 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 198 | Enogex Products Corp | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Jun 2022 |
| 199 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 200 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |