| 101 | Brooks Energy Company | Tulsa, OK 74114-3304 | Oil & Gas Operator | Jul 2008 |
| 102 | Brower Oil & Gas Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 103 | Brown Curt Operating Company | Tulsa, OK 74105 | Oil Operator | Nov 1998 |
| 104 | Brown Dorla M Trust | Tulsa, OK 74133-2926 | Oil & Gas Operator | Dec 2021 |
| 105 | Bso Inc | Cleveland, OK 74020 | Oil & Gas Operator | Jun 2025 |
| 106 | Buccaneer Petroleum Inc | Tonkawa, OK 74653-2513 | Oil & Gas Operator | Jan 2013 |
| 107 | Buntin Ronnie | Maramec, OK 74045-4500 | Oil & Gas Operator | Sep 2019 |
| 108 | Butler Petroleum Corp | Norman, OK 73069-7111 | Oil & Gas Operator | Dec 1998 |
| 109 | Buttonwood Petroleum Inc | Tulsa, OK 74136-4234 | Oil & Gas Operator | Jan 2014 |
| 110 | Bwab Incorporated | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 111 | BWB Resources Inc | Colorado Springs, CO 80908-7204 | Oil & Gas Operator | Jan 2016 |
| 112 | Byng Energy Group Inc | Enid, OK 73703 | Oil & Gas Operator | Oct 2025 |
| 113 | C & B Oil Company | Drumright, OK 74030 | Oil & Gas Operator | May 2025 |
| 114 | C & L Oil And Gas Corporation | Norman, OK 73069-8224 | Oil & Gas Operator | Jun 2025 |
| 115 | C B Energy Resources | Bartlesville, OK 74006 | Oil & Gas Operator | Mar 2015 |
| 116 | C S Petroleum Inc | Norman, OK 73070 | Oil & Gas Operator | Dec 2024 |
| 117 | Caldwell Engineering & Construction Inc | Chandler, OK 74834-5420 | Oil & Gas Operator | Jan 2025 |
| 118 | Callie Oil Company LLC | Perry, OK 73077 | Oil & Gas Operator | Jun 2025 |
| 119 | Calyx Energy LLC | Tulsa, OK 74146-3807 | Oil & Gas Operator | Feb 2020 |
| 120 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 121 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Jul 2025 |
| 122 | Cardinal Oil LLC | Drumright, OK 74030 | Oil & Gas Operator | Apr 2025 |
| 123 | Casa Grande Exploration Company | Casa Grande, AZ 85194 | Oil & Gas Operator | Jun 2025 |
| 124 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Jul 2025 |
| 125 | Cason William J | Santee, CA 92071-2765 | Oil Operator | Sep 2019 |
| 126 | Cassidy Jr John | Stroud, OK 74079-0200 | Oil & Gas Operator | Nov 2014 |
| 127 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 128 | Castlerock Resources Inc | Oklahoma City, OK 73116-3710 | Oil & Gas Operator | Jul 2020 |
| 129 | Cbo Oil And Gas LLC | Stillwater, OK 74075-8793 | Oil Operator | Jun 2025 |
| 130 | CDS Oil Company | Tulsa, OK 74147-1514 | Oil & Gas Operator | Mar 2015 |
| 131 | Cei Operating LLC | Katy, TX 77449 | Oil & Gas Operator | Oct 2025 |
| 132 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 133 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Jul 2025 |
| 134 | Charter Services LLC | Cushing, OK 74023 | Oil Operator | Jul 2025 |
| 135 | Cher Oil Company LTD | Ripley, OK 74062 | Oil & Gas Operator | Jun 2025 |
| 136 | Cherokee Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 137 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Oct 2025 |
| 138 | Chisholm Oil And Gas Operating LLC | Tulsa, OK 74103-3522 | Oil & Gas Operator | Jul 2025 |
| 139 | Chizum Oil LLC | Wichita, KS 67211 | Oil & Gas Operator | Jun 2025 |
| 140 | Cimarron River Operating Co | Mannford, OK 74044 | Oil & Gas Operator | Jun 2025 |
| 141 | Cimarron Valley Energy Inc | Stillwater, OK 74076 | Oil Operator | Apr 2015 |
| 142 | Circle 9 Resources LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Jun 2025 |
| 143 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Jun 2025 |
| 144 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Oct 2025 |
| 145 | Claremont Corporation | Tulsa, OK 74114 | Oil & Gas Operator | Feb 2017 |
| 146 | Claremont Exploration Inc | Tulsa, OK 74103-4107 | Oil & Gas Operator | Jun 1997 |
| 147 | Clay Investments LLC | Stillwater, OK 74075-3600 | Oil & Gas Operator | Jan 2021 |
| 148 | Cloer VIrgil R | Oklahoma City, OK 73121 | Oil & Gas Operator | Apr 1993 |
| 149 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 150 | CMT Operating LLC | Cleveland, OK 74020-0113 | Oil & Gas Operator | Mar 2015 |
| 151 | CMX Inc Of Kansas | Wichita, KS 67206-2561 | Oil & Gas Operator | Jul 2025 |
| 152 | Co-St Oil Operating Co Inc | Enid, OK 73706 | Oil & Gas Operator | Apr 1997 |
| 153 | Coastal Oils Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2013 |
| 154 | Cochran Industrial Corporation | Cushing, OK 74023-1427 | Oil & Gas Operator | Apr 2001 |
| 155 | Colorado Gas Compression Inc | Longmont, CO 80501-5868 | Oil & Gas Operator | Aug 2013 |
| 156 | Colpitt Brothers Oil | Collinsville, OK 74021 | Oil & Gas Operator | Apr 2020 |
| 157 | Colpitt Brothers Operating Co | Collinsville, OK 74021 | Oil & Gas Operator | Jun 2025 |
| 158 | Compass Resources | Enid, OK 73702 | Oil & Gas Operator | Dec 2007 |
| 159 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 160 | Consolidated Peto Equity LTD | La Crescenta, CA 91214 | Oil & Gas Operator | Dec 1996 |
| 161 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Oct 2025 |
| 162 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Oct 2025 |
| 163 | Cooper Lisa L | Cushing, OK 74023 | Oil & Gas Operator | Mar 2015 |
| 164 | Cooper Mineral Group Inc | Bellaire, TX 77401 | Oil & Gas Operator | Feb 2004 |
| 165 | Cornelius Petroleum Inc | | Oil & Gas Operator | Jul 2025 |
| 166 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 167 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 168 | Covington Oil Company Inc | Nichols Hills, OK 73116 | Oil & Gas Operator | Jun 2025 |
| 169 | Cox Linda | Bristow, OK 74010-0808 | Oil & Gas Operator | Jan 2018 |
| 170 | Crain & Deisenroth | Tulsa, OK 74103-4433 | Oil & Gas Operator | Mar 2015 |
| 171 | Crain & Deisenroth LLC | Tulsa, OK 74104-6511 | Oil & Gas Operator | Apr 2014 |
| 172 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 173 | Cromer Carroll Oil & Gas LLC | Kalispell, MT 59901 | Oil & Gas Operator | Jun 2025 |
| 174 | Cross Don | Cushing, OK 74023-6316 | Oil & Gas Operator | Feb 2022 |
| 175 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2025 |
| 176 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 177 | Crow Creek Operating Co III LLC | Tulsa, OK 74137-8432 | Oil & Gas Operator | Apr 2015 |
| 178 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Jun 2025 |
| 179 | Cudd Operating Corp. | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2020 |
| 180 | Culp & Copple Oil Company | Cushing, OK 74023 | Oil & Gas Operator | Jun 2025 |
| 181 | Cundiff Harold | Perkins, OK 74059-4199 | Oil & Gas Operator | Apr 2025 |
| 182 | Cundiff Jack | Perkins, OK 74059-4198 | Oil & Gas Operator | Apr 2014 |
| 183 | D & G Oil & Gas Company Inc | Enid, OK 73702-2027 | Oil & Gas Operator | Nov 2021 |
| 184 | D & J Oil Company Of Okla Inc | Enid, OK 73706-0129 | Oil & Gas Operator | May 1999 |
| 185 | D & M Production Co Inc | Drumright, OK 74030 | Oil & Gas Operator | Jun 2025 |
| 186 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 187 | Dana Petroleum Inc | Salt Lake City, UT 84047 | Oil & Gas Operator | Nov 1998 |
| 188 | Dance Oil Company | Denver, CO 80202 | Oil & Gas Operator | May 1993 |
| 189 | Darnell Bobby J | Oklahoma City, OK 73112-8884 | Oil & Gas Operator | Jul 2025 |
| 190 | Daube Company The | Ardmore, OK 73401 | Oil & Gas Operator | Jul 2025 |
| 191 | Daube Exploration Company | Ardmore, OK 73402 | Oil & Gas Operator | Nov 2020 |
| 192 | Davis Bros. Oil Producers, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2020 |
| 193 | Davis, William H. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2014 |
| 194 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Oct 2025 |
| 195 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 196 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 197 | Delong Oil & Gas Services, Inc. | Cushing, OK 74023 | Oil & Gas Operator | Dec 2024 |
| 198 | Deminex U.S. Oil Company | | Oil & Gas Operator | Jan 1998 |
| 199 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 200 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |