| 101 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 102 | BRG Petroleum LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2026 |
| 103 | BRG Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2020 |
| 104 | BRG Production Company | Tulsa, OK 74136-6338 | Oil & Gas Operator | Feb 2026 |
| 105 | Brighton Energy, L.L.C. | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2015 |
| 106 | Briscoe Oil Operating Co., Inc. | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2015 |
| 107 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 108 | Brock Exploration Corp | New Orleans, LA 70112-1707 | Oil & Gas Operator | Jan 1999 |
| 109 | Brock Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2019 |
| 110 | Brothers Production Company Inc. | Midland, TX 79708 | Oil & Gas Operator | Apr 2026 |
| 111 | Brower, Robert C. | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2026 |
| 112 | Brown Gary E | Tecumseh, OK 74873-0355 | Oil & Gas Operator | Aug 2015 |
| 113 | Brown Vernon L & Bonita | Cleveland, OK 74020-4426 | Oil & Gas Operator | Apr 2009 |
| 114 | Bso Inc | Cleveland, OK 74020 | Oil & Gas Operator | Feb 2026 |
| 115 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Apr 2026 |
| 116 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 117 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Apr 2026 |
| 118 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |
| 119 | Buttonwood Petroleum Inc | Tulsa, OK 74136-4234 | Oil & Gas Operator | Jan 2014 |
| 120 | Buxton Fred M | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Feb 2007 |
| 121 | C & D Drilling Company | Hennepin, OK 73046 | Oil & Gas Operator | Mar 2007 |
| 122 | C & D Supply | Cherokee, OK 73728-5817 | Oil & Gas Operator | Jan 2026 |
| 123 | C & Y Casing Pulling Company | Duncan, OK 73533 | Oil & Gas Operator | Feb 2026 |
| 124 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jan 2026 |
| 125 | Cabot Petroleum Corporation | Englewood, CO 80111-2529 | Oil & Gas Operator | Dec 2004 |
| 126 | Cactus Oil Company | Pampa, TX 79066 | Oil & Gas Operator | Aug 2000 |
| 127 | Cactus Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2000 |
| 128 | Calumet Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2019 |
| 129 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 130 | Canard Colvert Operating LLC | Dallas, TX 75231 | Oil & Gas Operator | Jan 2026 |
| 131 | Canvas Energy LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 132 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Oct 2025 |
| 133 | Capturepoint LLC | Allen, TX 75013 | Oil & Gas Operator | Apr 2026 |
| 134 | Caspen Oil, Inc. | Lakewood, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 135 | CB Oil Company | Drumright, OK 74030 | Oil & Gas Operator | Jan 2026 |
| 136 | Cenergy Exploration Company | Dallas, TX 75231 | Oil & Gas Operator | Sep 2000 |
| 137 | Central Resources, Inc. | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 138 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jan 2026 |
| 139 | Centurion Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 140 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Feb 2026 |
| 141 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2026 |
| 142 | Chatham John | Wilson, OK 73463-9575 | Oil Operator | Feb 2014 |
| 143 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2026 |
| 144 | Chester Oil Company | Wetumka, OK 74883-6227 | Oil & Gas Operator | Feb 2026 |
| 145 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 146 | Choate Kenny Dba Rebound Oil Co | Helena, OK 73741-0543 | Gas Operator | Feb 2026 |
| 147 | Chockley Energy LLC | Beaver, OK 73932 | Gas Operator | Jan 2026 |
| 148 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 149 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 150 | Cimarron Petroleum Corporation | Houston, TX 77057-2696 | Oil & Gas Operator | Jan 2026 |
| 151 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Jan 2026 |
| 152 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Feb 2026 |
| 153 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Apr 2026 |
| 154 | Cities Services Company | | Oil & Gas Operator | Mar 2008 |
| 155 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Dec 2025 |
| 156 | Claassen Oil And Gas Inc | Estes Park, CO 80517 | Oil & Gas Operator | Jan 2026 |
| 157 | Claremont Corporation | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2026 |
| 158 | Claremont Exploration Inc | Tulsa, OK 74103-4107 | Oil & Gas Operator | Jun 1997 |
| 159 | Clayton Corp Petro & Natural Gas Prod | Lakewood, CO 80228-1836 | Oil & Gas Operator | Oct 2020 |
| 160 | Clayton Corporation | Golden, CO 80401 | Oil & Gas Operator | Dec 2019 |
| 161 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 162 | CMS Energy Inc | Dallas, TX 75287 | Oil & Gas Operator | Jan 2026 |
| 163 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 164 | Coastal Oils Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2013 |
| 165 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Apr 2026 |
| 166 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 167 | Colorado Interstate Gas Co | Colorado Springs, CO 80944 | Oil & Gas Operator | Jul 2004 |
| 168 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 169 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 170 | Columbus Energy, LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 171 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Apr 2026 |
| 172 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 173 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 174 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 175 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 176 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 177 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Apr 2026 |
| 178 | Continental Gas Inc | Enid, OK 73702-5103 | Oil & Gas Operator | Apr 2012 |
| 179 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Apr 2026 |
| 180 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2026 |
| 181 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 182 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2026 |
| 183 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Dec 2025 |
| 184 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 185 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 186 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 187 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 188 | Couroil, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2000 |
| 189 | Courson Oil & Gas, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Apr 2026 |
| 190 | Courson, Harold D. | Perryton, TX 79070 | Oil & Gas Operator | Aug 1998 |
| 191 | Cox Oil & Gas Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2014 |
| 192 | Crain & Deisenroth | Tulsa, OK 74103-4433 | Oil & Gas Operator | Mar 2015 |
| 193 | Craw Operating LLC | Mooreland, OK 73852 | Oil & Gas Operator | Feb 2026 |
| 194 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 195 | Crescendo Resources, L.P. | Amarillo, TX 79188 | Oil & Gas Operator | Jan 2026 |
| 196 | Cross Timbers Oil Company | Dallas, TX 75284 | Oil & Gas Operator | May 2013 |
| 197 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 198 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 199 | Crouch Petroleum Company | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2015 |
| 200 | Crow Creek Operating Co III LLC | Tulsa, OK 74137-8432 | Oil & Gas Operator | Apr 2015 |