| 101 | Burlington Res Oil & Gas LP | Houston, TX 77079 | Oil & Gas Operator | Jan 2025 |
| 102 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 103 | Buttonwood Petroleum Inc | Tulsa, OK 74136-4234 | Oil & Gas Operator | Jan 2014 |
| 104 | BVD Inc | Yates Center, KS 66783-0194 | Oil & Gas Operator | Feb 2025 |
| 105 | C.D. Operating Company, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 106 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 107 | Cactus Energy Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2025 |
| 108 | Camino Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 109 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 110 | Canard Colvert Operating LLC | Dallas, TX 75219-6243 | Oil & Gas Operator | Feb 2025 |
| 111 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Feb 2025 |
| 112 | Capmac Inc | Tulsa, OK 74105-7119 | Oil & Gas Operator | Jan 2007 |
| 113 | Carl E Gungoll Exploration Inc | Oklahoma City, OK 73154-0466 | Oil & Gas Operator | Jan 2016 |
| 114 | Carl E Gungoll Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2025 |
| 115 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 116 | Carmen Field LP | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2008 |
| 117 | Carrera Energy LLC | Midland, TX 79704-5036 | Oil & Gas Operator | Jan 2025 |
| 118 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Feb 2025 |
| 119 | Castle Operating LLC | Oklahoma City, OK 73114-7444 | Oil & Gas Operator | Jan 2025 |
| 120 | CBS Energy LLC | Oklahoma City, OK 73142-4437 | Oil & Gas Operator | Jan 2025 |
| 121 | Cenergy Exploration Company | Dallas, TX 75231 | Oil & Gas Operator | Sep 2000 |
| 122 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jan 2025 |
| 123 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Mar 2025 |
| 124 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 125 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Feb 2025 |
| 126 | Chen K Wendell | Arlington, TX 76016-2555 | Oil & Gas Operator | Mar 2015 |
| 127 | Cherry, William H., Inc. | Oklahoma City, OK 73125 | Oil & Gas Operator | Mar 2015 |
| 128 | Chesapeake Energy MKT Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2022 |
| 129 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2025 |
| 130 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2025 |
| 131 | Chisholm Trail Resources Inc | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2002 |
| 132 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Apr 2025 |
| 133 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Apr 2025 |
| 134 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 135 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Jan 2025 |
| 136 | Citizen Energy II LLC | Tulsa, OK 74103-3729 | Oil & Gas Operator | Dec 2024 |
| 137 | Citizen Energy III LLC | Devner, CO 80202 | Oil & Gas Operator | Jan 2025 |
| 138 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 139 | Clark And Clark | Princeton, NJ 08540-1930 | Oil & Gas Operator | Jul 2013 |
| 140 | Clark Operating Services, Inc. | Okmulgee, OK 74447 | Oil & Gas Operator | May 2013 |
| 141 | Clydesdale Energy LLC | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Nov 2019 |
| 142 | Coaleum Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jan 2001 |
| 143 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 144 | Coho Oil & Gas Inc | Coppell, TX 75019-8288 | Oil & Gas Operator | Mar 2015 |
| 145 | Collier Petroleum Corporation | Taloga, OK 73667-9644 | Oil & Gas Operator | Jan 2013 |
| 146 | Comanche Exploration Co LLC | Oklahoma City, OK 73116-7334 | Oil & Gas Operator | Feb 2025 |
| 147 | Comanche Exploration Company | Oklahoma City, OK 73120-2797 | Oil & Gas Operator | Feb 2007 |
| 148 | Comanche Resources Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2025 |
| 149 | Complete Energy Services LLC | Gainesville, TX 76240 | Oil Operator | Aug 2022 |
| 150 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 151 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 152 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 153 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 154 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Apr 2025 |
| 155 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 156 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2025 |
| 157 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 158 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2025 |
| 159 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 160 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 161 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 162 | Council Oak Resources LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Jan 2025 |
| 163 | Cox Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2014 |
| 164 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 165 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 166 | CP Energy LLC | Edmond, OK 73034 | Oil Operator | Feb 2025 |
| 167 | Crain & Deisenroth | Tulsa, OK 74103-4433 | Oil & Gas Operator | Mar 2015 |
| 168 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 169 | Crescendo Resources, L.P. | Amarillo, TX 79188 | Oil & Gas Operator | Jan 2025 |
| 170 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 171 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2024 |
| 172 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 173 | Crow Creek Operating Co III LLC | Tulsa, OK 74137-8432 | Oil & Gas Operator | Apr 2015 |
| 174 | Crow Oil LLC | Tulsa, OK 74133-2914 | Oil & Gas Operator | Sep 2019 |
| 175 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Jan 2025 |
| 176 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Feb 2025 |
| 177 | D & D Pipe & Equipment Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2005 |
| 178 | D & G Oil & Gas Company Inc | Enid, OK 73702-2027 | Oil & Gas Operator | Nov 2021 |
| 179 | D & J Oil Co | Kermit, TX 79745 | Oil & Gas Operator | Apr 2025 |
| 180 | D & J Oil Company Of Okla Inc | Enid, OK 73706-0129 | Oil & Gas Operator | May 1999 |
| 181 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 182 | Daco, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Apr 2025 |
| 183 | Dalen Resources Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 184 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 185 | Daube Company The | Ardmore, OK 73401 | Oil & Gas Operator | Feb 2025 |
| 186 | Dauco Petroleum Corporation | Rowlett, TX 75089-3066 | Oil & Gas Operator | Jan 2021 |
| 187 | Davis & Davis | | Oil & Gas Operator | Dec 2021 |
| 188 | Dawson Resources Inc | Franktown, CO 80116 | Oil & Gas Operator | Mar 2015 |
| 189 | Dawson-Markwell Exploration Co. | Oklahoma City, OK 73101 | Oil & Gas Operator | Jan 2025 |
| 190 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Jan 2025 |
| 191 | Dehart Company (The) | Ardmore, OK 73402 | Oil & Gas Operator | Feb 2025 |
| 192 | Dennett'S Inc | Enid, OK 73701-1851 | Oil & Gas Operator | Apr 2014 |
| 193 | Derby Exploration LLC | Okc, OK 73102 | Oil & Gas Operator | Feb 2025 |
| 194 | Dette Oil Corporation | Oklahoma City, OK 73162-6249 | Oil & Gas Operator | Oct 2015 |
| 195 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 196 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 197 | Devon Gas Services, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2023 |
| 198 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 199 | Dewey Energy GP LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2022 |
| 200 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |