| 101 | Bradmar Petroleum Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 102 | Brady Energy Investments LLC | Healdton, OK 73438-0788 | Oil & Gas Operator | Feb 2025 |
| 103 | Brady William H | Healdton, OK 73438-0788 | Oil & Gas Operator | Mar 2025 |
| 104 | Brammer Supply Inc | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2014 |
| 105 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2025 |
| 106 | Brenneis Energy | Duncan, OK 73533-5415 | Oil & Gas Operator | Feb 2025 |
| 107 | Brenneis Oil Company | Norman, OK 73072-3963 | Oil & Gas Operator | Aug 2012 |
| 108 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 109 | BRG Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2020 |
| 110 | Briscoe Oil Company | Kingfisher, OK 73750-2322 | Oil & Gas Operator | Apr 2014 |
| 111 | Briscoe Oil Operating Co., Inc. | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2015 |
| 112 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 113 | Brower Oil & Gas Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 114 | Brower, Robert C. | Fort Worth, TX 76116 | Oil & Gas Operator | May 2025 |
| 115 | Brown & Brown Production Inc | Ratliff City, OK 73481 | Oil & Gas Operator | Feb 2025 |
| 116 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 117 | Bud Oil, Inc. | Duncan, OK 73534 | Oil & Gas Operator | May 2025 |
| 118 | Bullard Bros Production Co Inc | Comanche, OK 73529-0637 | Oil Operator | Mar 2015 |
| 119 | Bullard Don W | Ardmore, OK 73401-3646 | Oil & Gas Operator | Dec 2019 |
| 120 | Bullard Oil Company LLC | Tuttle, OK 73089-8375 | Oil Operator | Aug 2024 |
| 121 | Bunyard Jerry L | Stroud, OK 74079 | Oil & Gas Operator | Oct 2024 |
| 122 | Butkin Oil Company | Duncan, OK 73534-2090 | Oil & Gas Operator | Sep 2021 |
| 123 | Butkin Oil Company LLC | Duncan, OK 73533 | Oil & Gas Operator | Mar 2023 |
| 124 | Buttonwood Petroleum Inc | Tulsa, OK 74136-4234 | Oil & Gas Operator | Jan 2014 |
| 125 | Byng Operating LLC | Ada, OK 74820-0677 | Oil & Gas Operator | Mar 2025 |
| 126 | C & J Exploration LLC | Colorado Springs, CO 80920-3946 | Oil & Gas Operator | Oct 2022 |
| 127 | C & R Petroleum Co. | Duncan, OK 73533-1341 | Oil & Gas Operator | Feb 2025 |
| 128 | C & Y Casing Pulling Company | Duncan, OK 73533 | Oil & Gas Operator | Mar 2025 |
| 129 | C E D LC | Enid, OK 73702-0326 | Oil & Gas Operator | Oct 2021 |
| 130 | C E Harmon Oil Inc | Tulsa, OK 74136-6559 | Oil & Gas Operator | Mar 2025 |
| 131 | C F & L Producing Co | | Oil & Gas Operator | Sep 2000 |
| 132 | C.D. Operating Company, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 133 | Cain Randy A | Duncan, OK 73533 | Oil & Gas Operator | Mar 2025 |
| 134 | Cain Richard | Comanche, OK 73529-1248 | Oil & Gas Operator | May 2020 |
| 135 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 136 | Camino Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 137 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 138 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Mar 2025 |
| 139 | Canyon Creek Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 140 | Caprock, Inc. | Ralls, TX 79357 | Oil & Gas Operator | Mar 2013 |
| 141 | Carmen Field LP | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2008 |
| 142 | Carney A B | | Oil & Gas Operator | Jan 2014 |
| 143 | Casillas Operating LLC | Tulsa, OK 74103-4060 | Oil & Gas Operator | Mar 2025 |
| 144 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Mar 2025 |
| 145 | Castle Operating LLC | Oklahoma City, OK 73114-7444 | Oil & Gas Operator | Feb 2025 |
| 146 | Cathey Production Company | Ryan, OK 73565-0485 | Oil Operator | Dec 2010 |
| 147 | Caulkins Oil Company | Aztec, NM 87410 | Oil & Gas Operator | Oct 2024 |
| 148 | Cement Oil Company | Cement, OK 73017-9234 | Oil & Gas Operator | Mar 2025 |
| 149 | CFC Oil Inc | Cyril, OK 73029-5601 | Oil & Gas Operator | Mar 2025 |
| 150 | Chance Oil Co., Inc. | Vernon, TX 76385 | Oil & Gas Operator | Mar 2025 |
| 151 | Chapman Jim | Bristow, OK 74010-1173 | Oil Operator | Apr 2021 |
| 152 | Chapman Oil Company | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 153 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | May 2025 |
| 154 | Chastain Diane | Coffeyville, KS 67337-9620 | Oil & Gas Operator | Feb 2015 |
| 155 | Chatham Verdell | Ratliff City, OK 73081-0061 | Oil Operator | Oct 2009 |
| 156 | Cherokee Royalties & Minerals Inc | Duncan, OK 73533 | Oil & Gas Operator | Mar 2025 |
| 157 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 158 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 159 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | May 2025 |
| 160 | Chica Oil Company | Lago VIsta, TX 78645-6561 | Oil & Gas Operator | Mar 2001 |
| 161 | Chisum G H | Duncan, OK 73533 | Oil & Gas Operator | Dec 2010 |
| 162 | Christie Jr C B | Wichita Falls, TX 76308-4873 | Oil & Gas Operator | May 2024 |
| 163 | Cigna Energy Resources Inc | Englewood, CO 80155-5038 | Oil Operator | Nov 1998 |
| 164 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 165 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 166 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 167 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 168 | Citizen Energy III LLC | Devner, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 169 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 170 | CLV Oil & Gas Inc | Tulsa, OK 74169-0713 | Oil & Gas Operator | Apr 2020 |
| 171 | Coaleum Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jan 2001 |
| 172 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 173 | Coastal Oils Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2013 |
| 174 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | May 2025 |
| 175 | Coastal States Gas Prod. Co. | | Oil & Gas Operator | Jun 1996 |
| 176 | Cobopco Inc | Tulsa, OK 74103-4391 | Oil & Gas Operator | Feb 1997 |
| 177 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 178 | Coho Oil & Gas Inc | Coppell, TX 75019-8288 | Oil & Gas Operator | Mar 2015 |
| 179 | Coleman Oil LLC | Marlow, OK 73055 | Oil Operator | Nov 2021 |
| 180 | Collins Petroleum Inc | Bartlesville, OK 74006-7024 | Oil & Gas Operator | Apr 2005 |
| 181 | Colonial Energy Company Inc | Garland, TN 75045 | Oil & Gas Operator | Apr 2015 |
| 182 | Colpitt Brothers Oil | Collinsville, OK 74021 | Oil & Gas Operator | Apr 2020 |
| 183 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 184 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 185 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | May 2025 |
| 186 | Comet Oil Company | Velma, OK 73091 | Oil & Gas Operator | May 2005 |
| 187 | Comet-Haines Oil Company | Sulphur, OK 73086-0546 | Oil & Gas Operator | Mar 2013 |
| 188 | Compadre Drilling & Expl Corp | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2015 |
| 189 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 190 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 191 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 192 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 193 | Continental Exploration LLC | Lufkin, TX 75915 | Oil & Gas Operator | May 2025 |
| 194 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | May 2025 |
| 195 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2025 |
| 196 | Cordillera Energy Partners II LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Feb 2025 |
| 197 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 198 | Corley Production Company | Wilson, OK 73463-7218 | Oil Operator | Mar 2025 |
| 199 | Corley Production Inc | Comanche, OK 73529-4668 | Oil Operator | Mar 2015 |
| 200 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |