| 101 | Brooks Hall Oil Corp | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 1998 |
| 102 | Brower Oil & Gas Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 103 | Brown & Borelli, Inc. | Kingfisher, OK 73750 | Oil & Gas Operator | Feb 2026 |
| 104 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Feb 2026 |
| 105 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 106 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 107 | Buttonwood Petroleum Inc | Tulsa, OK 74136-4234 | Oil & Gas Operator | Jan 2014 |
| 108 | C & A Oil Company | Edmond, OK 73013-9413 | Oil & Gas Operator | Mar 2015 |
| 109 | C & C Oil Co. | Borger, TX 79008 | Oil & Gas Operator | Nov 2025 |
| 110 | C & J Exploration LLC | Colorado Springs, CO 80920-3946 | Oil & Gas Operator | Oct 2022 |
| 111 | C & L Oil And Gas Corporation | Norman, OK 73069-8224 | Oil & Gas Operator | Dec 2025 |
| 112 | C & Y Casing Pulling Company | Duncan, OK 73533 | Oil & Gas Operator | Dec 2025 |
| 113 | C D Operating Company Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 114 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Nov 2025 |
| 115 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 116 | Calumet Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2019 |
| 117 | Camino Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 118 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 119 | Canaan Resources X LLC | Oklahoma City, OK 73103-4925 | Oil & Gas Operator | Sep 2024 |
| 120 | Canard Colvert Operating LLC | Dallas, TX 75231 | Oil & Gas Operator | Nov 2025 |
| 121 | Canvas Energy LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 122 | Capitol Well Servicing Co., Inc. | Oklahoma City, OK 73143 | Oil & Gas Operator | May 2023 |
| 123 | Capstone Oil & Gas LLC | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2025 |
| 124 | Carl E Gungoll Exploration Inc | Oklahoma City, OK 73154-0466 | Oil & Gas Operator | Jan 2016 |
| 125 | Carl Humphries Inc | Piedmont, OK 73078-0514 | Oil & Gas Operator | Dec 2025 |
| 126 | Carmen Field LP | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2008 |
| 127 | Carney A B | | Oil & Gas Operator | Jan 2014 |
| 128 | Carver Harry | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 2000 |
| 129 | Casillas Operating LLC | Tulsa, OK 74103-4060 | Oil & Gas Operator | Nov 2025 |
| 130 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Dec 2025 |
| 131 | Castelli Exploration Inc | Oklahoma City, OK 73162 | Oil & Gas Operator | Nov 2025 |
| 132 | Castlerock Resources Inc | Oklahoma City, OK 73116-3710 | Oil & Gas Operator | Jul 2020 |
| 133 | CB Oil Company | Drumright, OK 74030 | Oil & Gas Operator | Dec 2025 |
| 134 | CBL Resources LLC | Tulsa, OK 74136-6308 | Oil & Gas Operator | Dec 2025 |
| 135 | CDS Oil Company | Tulsa, OK 74147-1514 | Oil & Gas Operator | Mar 2015 |
| 136 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Jan 2026 |
| 137 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 138 | Champion Reserves-Cri Inc | Oklahoma City, OK 73123 | Oil & Gas Operator | Jun 1994 |
| 139 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Dec 2025 |
| 140 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2026 |
| 141 | Chen K Wendell | Arlington, TX 76016-2555 | Oil & Gas Operator | Mar 2015 |
| 142 | Chermac Energy Corporation | Edmond, OK 73083 | Oil & Gas Operator | Apr 2020 |
| 143 | Cherokee Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 144 | Cherokee Royalties & Minerals Inc | Duncan, OK 73533 | Oil & Gas Operator | Nov 2025 |
| 145 | Cherry, William H., Inc. | Oklahoma City, OK 73125 | Oil & Gas Operator | Mar 2015 |
| 146 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2026 |
| 147 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 148 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2026 |
| 149 | Chisholm Oil And Gas Operating LLC | Tulsa, OK 74103-3522 | Oil & Gas Operator | Dec 2025 |
| 150 | Chisholm Operating LLC | Oklahoma City, OK 73101-1502 | Oil & Gas Operator | Dec 2017 |
| 151 | Chisholm Trail Resources Inc | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2002 |
| 152 | Choctaw Gas Company | Quinton, OK 74561 | Gas Operator | Nov 2025 |
| 153 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 154 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 155 | Cimarron Petroleum Corporation | Houston, TX 77057-2696 | Oil & Gas Operator | Nov 2025 |
| 156 | Cities Services Company | | Oil & Gas Operator | Mar 2008 |
| 157 | Citizen Energy II LLC | Tulsa, OK 74103-3729 | Oil & Gas Operator | Apr 2025 |
| 158 | Citizen Energy III LLC | Devner, CO 80202 | Oil & Gas Operator | Nov 2025 |
| 159 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 160 | Clark And Clark | Princeton, NJ 08540-1930 | Oil & Gas Operator | Jul 2013 |
| 161 | Clark Energy Company | Edmond, OK 73003-6706 | Oil & Gas Operator | Aug 2013 |
| 162 | Clark Operating Services Inc | Okmulgee, OK 74447 | Oil & Gas Operator | May 2013 |
| 163 | Clifford Resources Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | Jul 2015 |
| 164 | Clifton & Associates Inc | Tulsa, OK 74133 | Oil & Gas Operator | May 2020 |
| 165 | Coaleum Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jan 2001 |
| 166 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 167 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 168 | Collet Oil Ventures Inc | Denver, CO 80217 | Oil & Gas Operator | Jun 2004 |
| 169 | Colonial Resources LLC | Edmond, OK 73003-3207 | Oil & Gas Operator | Aug 2019 |
| 170 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 171 | Columbia Production Company | Edmond, OK 73083 | Oil & Gas Operator | May 2020 |
| 172 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 173 | Comanche Exploration Co LLC | Oklahoma City, OK 73116-7334 | Oil & Gas Operator | Dec 2025 |
| 174 | Comanche Exploration Company | Oklahoma City, OK 73120-2797 | Oil & Gas Operator | Feb 2007 |
| 175 | Comanche Petroleum Corporation | Oklahoma City, OK 73179 | Oil & Gas Operator | Apr 2024 |
| 176 | Comanche Resources Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2025 |
| 177 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Feb 2026 |
| 178 | Complete Energy Services LLC | Gainesville, TX 76240 | Oil Operator | Aug 2022 |
| 179 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 180 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 181 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 182 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 183 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 184 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Feb 2026 |
| 185 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 186 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Feb 2026 |
| 187 | Cook W R Inc | Duncan, OK 73534-0069 | Oil & Gas Operator | Jun 2000 |
| 188 | Cordillera Energy Partners II LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Nov 2025 |
| 189 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 190 | Corner Energy LLC | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Mar 2015 |
| 191 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 192 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 193 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 194 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 195 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 196 | CPRP Services LLC | Oklahoma City, OK 73102-5804 | Oil & Gas Operator | Nov 2025 |
| 197 | Crabtree Barbara T | Forney, TX 75126-5818 | Oil & Gas Operator | Oct 2024 |
| 198 | Craig Elder Oil And Gas LLC | Edmond, OK 73013 | Oil & Gas Operator | Nov 2025 |
| 199 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 200 | CRB Resources Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 2025 |