| 101 | CD Consulting & Operating Co. | Bridgeport, TX 76426 | Oil & Gas Operator | Jul 2025 |
| 102 | Centurion Operating Corporation | Rockwall, TX 75087 | Oil & Gas Operator | Jul 2025 |
| 103 | Certified Petroleum Inc. | Mineral Wells, TX 76067 | Oil & Gas Operator | May 2006 |
| 104 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 105 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Jul 2025 |
| 106 | Chenoweth, Grover | Marble Falls, TX 78654 | Oil & Gas Operator | Dec 2024 |
| 107 | Cherokee Production Corp. | Greenville, TX 75401 | Oil & Gas Operator | Jul 2025 |
| 108 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Jul 2025 |
| 109 | Christie Oil Co., Inc | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 1996 |
| 110 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 111 | Clausen, A. G. | Cross Plains, TX 76443 | Oil & Gas Operator | Jul 2025 |
| 112 | Clearly Petroleum, LLC | Houston, TX 77086 | Oil & Gas Operator | Jun 2020 |
| 113 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 114 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 115 | Concho Oilfield Service, Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2013 |
| 116 | Cooper Oil & Gas, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jul 2025 |
| 117 | Coreterra Operating, LLC | Pampa, TX 79065 | Oil & Gas Operator | Jul 2025 |
| 118 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 119 | Crossbow Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 120 | Crown Equipment Co. | Weatherford, TX 76086 | Oil & Gas Operator | Jul 2025 |
| 121 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 122 | Crystal River Oil & Gas LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Jan 2023 |
| 123 | CTC Oil Co., Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2025 |
| 124 | Cuatro Oil And Gas Corporation | Abilene, TX 79603 | Oil & Gas Operator | Jul 2025 |
| 125 | Cumberland Petroleum, Inc. II | Weatherford, TX 76086 | Oil & Gas Operator | May 1997 |
| 126 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | Jul 2025 |
| 127 | D & R Enterprises | Eastland, TX 76448 | Oil & Gas Operator | Oct 2020 |
| 128 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 129 | D. & D. Operating Account | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2009 |
| 130 | D.J. & T. Energy | Abilene, TX 79601 | Oil & Gas Operator | Jul 2025 |
| 131 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 132 | Dale Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 2025 |
| 133 | Dalf Energy LLC | Pampa, TX 79066 | Oil & Gas Operator | Jul 2025 |
| 134 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 135 | Dartex Energy Inc | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 136 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Jul 2025 |
| 137 | DBC Operating Company LLC | Midlothian, TX 76065 | Oil & Gas Operator | Jul 2025 |
| 138 | Dearing, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2021 |
| 139 | Decleva, Paul | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2020 |
| 140 | Delek Energy Systems Us Inc | Denver, CO 80202 | Oil & Gas Operator | Oct 2011 |
| 141 | Delta Oil & Gas Company | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2003 |
| 142 | Delta Oil & Gas LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2025 |
| 143 | Demoss, L. V. | Graham, TX 76450 | Oil & Gas Operator | May 2004 |
| 144 | Denton Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Jul 2025 |
| 145 | Derby Oil Of Texas | Ventura, CA 93003 | Oil & Gas Operator | May 1996 |
| 146 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Jul 2025 |
| 147 | Dimock Operating Company | Frisco, TX 75034 | Oil & Gas Operator | Jul 2025 |
| 148 | Dixie Drilling Company, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Nov 2011 |
| 149 | DJ & T Services, LLC | Abilene, TX 79601 | Oil & Gas Operator | Jul 2025 |
| 150 | DJD Drilling Corporation | Graham, TX 76450 | Oil Operator | Jan 2010 |
| 151 | Dolberry Energy Resources Corp. | Dallas, TX 75252 | Oil Operator | Jul 2025 |
| 152 | Dooley, Jeff | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2012 |
| 153 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Jul 2025 |
| 154 | Double K Production | Graham, TX 76450 | Oil & Gas Operator | Sep 2014 |
| 155 | Double Play Oil & Gas, Inc | Portland, TX 78374 | Oil & Gas Operator | Jul 2025 |
| 156 | Dowell Oil & Gas | Stephenville, TX 76401 | Oil & Gas Operator | Jul 2025 |
| 157 | DP2, LLC | Southlake, TX 76092 | Oil & Gas Operator | Jul 2025 |
| 158 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 159 | Dry Fork Production Co., LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2025 |
| 160 | E & S Operating Company | Caddo, TX 76429 | Oil & Gas Operator | Feb 2018 |
| 161 | E.C. Hindman Oil And Gas | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 162 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jul 2025 |
| 163 | Eastland Operating, L.L.C. | Ranger, TX 76470 | Oil & Gas Operator | Jul 2025 |
| 164 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 165 | Echols Oil Company | Caddo, TX 76429 | Oil & Gas Operator | Jan 2012 |
| 166 | Echols Oil Company, L.L.C. | Caddo, TX 76429 | Oil & Gas Operator | Jul 2025 |
| 167 | Edington Oil Company | Albany, TX 76430 | Oil & Gas Operator | Aug 2006 |
| 168 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | May 2025 |
| 169 | Eldorado Oil And Gas, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Nov 1995 |
| 170 | Energex Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2025 |
| 171 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Mar 2025 |
| 172 | Engas Corporation | Jacksboro, TX 76458 | Oil & Gas Operator | May 2008 |
| 173 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 174 | Enrich Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Jul 2025 |
| 175 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 176 | Enstar Energy, Inc. | Arlington, TX 76003 | Oil & Gas Operator | Jul 2025 |
| 177 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 178 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 179 | Ernmar Investments, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Jul 2025 |
| 180 | Esenjay Petroleum Corp. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jul 1998 |
| 181 | Estacado Energy, LLC | Iowa Park, TX 76367 | Oil & Gas Operator | Jul 2025 |
| 182 | Evarado Oil Company | Strawn, TX 76475 | Oil & Gas Operator | Jul 2025 |
| 183 | Ex-Cel Resources, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2025 |
| 184 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Apr 2025 |
| 185 | Expanding Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 186 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Jul 2025 |
| 187 | Fagadau Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2006 |
| 188 | Fairway Links Energy, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Aug 2016 |
| 189 | Fambrough Oil & Gas, LLC | San Angelo, TX 76905 | Oil & Gas Operator | Jul 2025 |
| 190 | Fambrough, Tim D. | San Angelo, TX 76905 | Oil & Gas Operator | Nov 2016 |
| 191 | Federal Oil, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Jul 2025 |
| 192 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 193 | First American Operating Co. | Breckenridge, TX 76424 | Oil & Gas Operator | Aug 2006 |
| 194 | Five K Partnership | Graham, TX 76450 | Oil & Gas Operator | Oct 2023 |
| 195 | Flournoy, Russell B. | Breckenridge, TX 76424 | Oil & Gas Operator | Jan 2020 |
| 196 | Foag, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2022 |
| 197 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Jul 2025 |
| 198 | Four Corners Petroleum II, LLC | Denver, CO 80215 | Oil & Gas Operator | Feb 2023 |
| 199 | Franklin, J.W. Oil Operator | | Oil & Gas Operator | Nov 2001 |
| 200 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |