| 101 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 102 | Carmen Field LP | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2008 |
| 103 | Cartledge & Cartledge Oil Company Inc | Kiefer, OK 74041 | Oil & Gas Operator | Mar 2025 |
| 104 | Cates Betty J | Tulsa, OK 74112 | Oil & Gas Operator | Nov 2016 |
| 105 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Mar 2025 |
| 106 | Chapman Exploration Inc | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2013 |
| 107 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | May 2025 |
| 108 | Chen K Wendell | Arlington, TX 76016-2555 | Oil & Gas Operator | Mar 2015 |
| 109 | Chesapeake Exploration LLC | Oklahoma City, OK 731540496 | Oil & Gas Operator | Jul 2020 |
| 110 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 111 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 112 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 113 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 114 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 115 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 116 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 117 | Cities Services Company | | Oil & Gas Operator | Mar 2008 |
| 118 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 119 | Click Robert R | Dallas, TX 75231 | Oil & Gas Operator | Nov 1995 |
| 120 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 121 | Coaleum Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jan 2001 |
| 122 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 123 | Comanche Exploration Co LLC | Oklahoma City, OK 73116-7334 | Oil & Gas Operator | Mar 2025 |
| 124 | Comanche Resources Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 125 | Complete Energy Services LLC | Gainesville, TX 76240 | Oil Operator | Aug 2022 |
| 126 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 127 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 128 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 129 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 130 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 131 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | May 2025 |
| 132 | Continental Gas Inc | Enid, OK 73702-5103 | Oil & Gas Operator | Apr 2012 |
| 133 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 134 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | May 2025 |
| 135 | Cook W R Inc | Duncan, OK 73534-0069 | Oil & Gas Operator | Jun 2000 |
| 136 | Cordillera Energy Partners III LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Mar 2014 |
| 137 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 138 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 139 | Courson Oil & Gas, Inc. | Perryton, TX 79070 | Oil & Gas Operator | May 2025 |
| 140 | Courson, Harold D. | Perryton, TX 79070 | Oil & Gas Operator | Aug 1998 |
| 141 | Cox Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2014 |
| 142 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 143 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 144 | Crescendo Resources, L.P. | Amarillo, TX 79188 | Oil & Gas Operator | Feb 2025 |
| 145 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 146 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2025 |
| 147 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 148 | Crow Oil LLC | Tulsa, OK 74133-2914 | Oil & Gas Operator | Sep 2019 |
| 149 | Crusader Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2011 |
| 150 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 151 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 152 | Crusader Energy II LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 153 | Crusader Energy III LLC | Oklahoma City, OK 73142-1856 | Oil & Gas Operator | Feb 2011 |
| 154 | Crystal Energy Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2019 |
| 155 | Csoda Operating Company LLC | Amarillo, TX 79114-7506 | Oil & Gas Operator | Aug 2021 |
| 156 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Mar 2025 |
| 157 | D & D Pipe & Equipment Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2005 |
| 158 | D & J Oil Company | Kermit, TX 79745 | Oil & Gas Operator | May 2025 |
| 159 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 160 | Dalen Resources Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 161 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 162 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 163 | Darrah Oil Company LLC | Wichita, KS 67201 | Oil & Gas Operator | May 2025 |
| 164 | Davco Productions Inc | Springer, OK 73458-8191 | Oil & Gas Operator | Jun 2021 |
| 165 | Dawson Resources Inc | Franktown, CO 80116 | Oil & Gas Operator | Mar 2015 |
| 166 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 167 | Delta D Operations | Wilson, OK 73463 | Oil & Gas Operator | Jul 2014 |
| 168 | Dempsey, Wayne L | | Oil & Gas Operator | Mar 2011 |
| 169 | Denveramerican Petro LLC | | Oil & Gas Operator | May 2006 |
| 170 | Dette Oil Corporation | Oklahoma City, OK 73162-6249 | Oil & Gas Operator | Oct 2015 |
| 171 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 172 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 173 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 174 | Diamond Energy Operating Company | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2005 |
| 175 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 176 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 177 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | May 2025 |
| 178 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | May 2025 |
| 179 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Mar 2025 |
| 180 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 181 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 182 | Donovan Joe D Or L P McElwaine | Tulsa, OK 74119 | Gas Operator | Jan 2014 |
| 183 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 184 | Dragon Energy LLC | Tulsa, OK 74135-7234 | Oil & Gas Operator | Feb 2015 |
| 185 | DRG Energy Inc. | Norman, OK 73026-3171 | Oil & Gas Operator | Jan 2025 |
| 186 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 187 | Dune Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jan 1993 |
| 188 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 189 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | May 2025 |
| 190 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | May 2025 |
| 191 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Feb 2025 |
| 192 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 193 | Edwards Production Inc | Healdton, OK 73438-6221 | Oil & Gas Operator | Mar 2015 |
| 194 | Egolf Operating Company | Oklahoma City, OK 73114-7899 | Oil & Gas Operator | Apr 1998 |
| 195 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 196 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Mar 2025 |
| 197 | Encino Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 198 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Apr 2025 |
| 199 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 200 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |