| 101 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 102 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 103 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 104 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Jan 2026 |
| 105 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Apr 2026 |
| 106 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Apr 2026 |
| 107 | Far West Development, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2026 |
| 108 | Felderhoff Production Company | Muenster, TX 76252 | Oil & Gas Operator | Apr 2026 |
| 109 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Apr 2026 |
| 110 | Flintlock Exploration, LLC | Frisco, TX 75035 | Oil & Gas Operator | Apr 2026 |
| 111 | Fortson Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2020 |
| 112 | FP Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2008 |
| 113 | Fuller Petroleum Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 114 | Fultz Oil Company | Fort Worth, TX 76121 | Oil & Gas Operator | Dec 1995 |
| 115 | G N K Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 116 | Gaynor Oil Co. | Sherman, TX 75092 | Oil & Gas Operator | Jun 2002 |
| 117 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 118 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 119 | Gilbreath Tank Trucks, Inc. | Whitesboro, TX 76273 | Oil Operator | Apr 2026 |
| 120 | Ginnings Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2025 |
| 121 | GLM Energy Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Jan 2026 |
| 122 | Gordon Oil Company, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Oct 2004 |
| 123 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 124 | Gray Operating Company, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Apr 2018 |
| 125 | Grayson Petroleum Company | Whitesboro, TX 76273 | Oil & Gas Operator | Apr 2026 |
| 126 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 127 | Guffey, Roy, Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2011 |
| 128 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 129 | H.L. Clark Oil Company LLC | Whitesboro, TX 76273 | Oil Operator | Apr 2026 |
| 130 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | Apr 2026 |
| 131 | Harbor Resources LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Apr 2026 |
| 132 | Harper, Wayne | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 133 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 134 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 135 | Headline Resources, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Aug 1997 |
| 136 | Heape Exploration, Inc. | Dallas, TX 75367 | Oil & Gas Operator | Dec 2020 |
| 137 | Heape, Gene G. | Dallas, TX 75367 | Oil & Gas Operator | Jun 2003 |
| 138 | Hep Oil Company, LTD. | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 139 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 140 | Hess, Jerry Operating Co. | Muenster, TX 76252 | Oil & Gas Operator | Apr 2026 |
| 141 | Hill Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2009 |
| 142 | Holden Energy Corporation | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2015 |
| 143 | Houtchens, D. D. | Gainesville, TX 76240 | Oil & Gas Operator | Apr 2026 |
| 144 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Apr 2026 |
| 145 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Apr 2026 |
| 146 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2026 |
| 147 | Huntington Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2006 |
| 148 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 149 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Apr 2026 |
| 150 | Interior Oil Corporation | Derby, KS 67037 | Oil & Gas Operator | Jan 2023 |
| 151 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Apr 2026 |
| 152 | Jaco, Troy Inc. | Sherman, TX 75091 | Oil & Gas Operator | Apr 2026 |
| 153 | Jet-Star Co. | Gainesville, TX 76240 | Oil & Gas Operator | Apr 2026 |
| 154 | Jetta Operating Company, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2026 |
| 155 | Jones, L. E. Operating, Inc. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2026 |
| 156 | Jones, L. E. Production Co. | Duncan, OK 73534 | Oil & Gas Operator | Jul 2014 |
| 157 | Jubilee Oil Corporation | Denison, TX 75020 | Oil Operator | Oct 2012 |
| 158 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2026 |
| 159 | Kaler Oil Company | Gainesville, TX 76240 | Oil & Gas Operator | Dec 2024 |
| 160 | Keene, Roy J. Jr. | Sugar Land, TX 77498 | Oil & Gas Operator | Jun 2016 |
| 161 | Kepco Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2026 |
| 162 | Kepco. Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 163 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Feb 2026 |
| 164 | Kimbell Oil Company Of Texas | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 165 | King Energy Resources | Kerrville, TX 78029 | Oil & Gas Operator | Apr 2026 |
| 166 | Kingery Drilling Co., Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Feb 2026 |
| 167 | Kodiak Oil & Gas Inc | Muenster, TX 76252 | Oil & Gas Operator | Apr 2026 |
| 168 | Kornye-Tillman Company | Cleburne, TX 76031 | Oil & Gas Operator | Apr 2026 |
| 169 | Laguna Petroleum Corporation | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 170 | Lakeshore Operating, LLC | Wichita, KS 67203 | Oil & Gas Operator | Apr 2026 |
| 171 | Landrum Petroleum Co., Inc. | Burkburnett, TX 76354 | Oil Operator | Mar 2008 |
| 172 | Lane Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2026 |
| 173 | Larson, Perry L Operating Co Inc | Dallas, TX 75382 | Oil & Gas Operator | Feb 2021 |
| 174 | Leonard, Patricia Anne | San Antonio, TX 78209 | Oil & Gas Operator | Oct 1996 |
| 175 | Lera | Borger, TX 79007 | Oil & Gas Operator | Apr 2026 |
| 176 | Lewis Operating Company | Holliday, TX 76366 | Oil & Gas Operator | Apr 2026 |
| 177 | Lime Rock Resources IV-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 178 | Little, Quintin Company,Inc.,The | Ardmore, OK 73402 | Oil & Gas Operator | Apr 2026 |
| 179 | Live Oak Gas Company | Dallas, TX 75251 | Oil & Gas Operator | Apr 2026 |
| 180 | Loeb, Herman L, LLC | Lawrenceville, IL 62439 | Oil Operator | Dec 2017 |
| 181 | Lomak Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1998 |
| 182 | Longfellow Energy, LP | Dallas, TX 75225 | Oil & Gas Operator | Apr 2026 |
| 183 | M-B Operating Co., Inc. | Rowlett, TX 75030 | Oil & Gas Operator | Apr 2026 |
| 184 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Feb 2026 |
| 185 | Magnum Energy Inc | Norman, OK 73072-2403 | Oil & Gas Operator | Feb 2026 |
| 186 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 187 | Maverick Production | Nocona, TX 76255 | Oil & Gas Operator | May 2007 |
| 188 | Mayo, Danny | Whitesboro, TX 76273 | Oil & Gas Operator | Apr 2026 |
| 189 | McCommons Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Apr 2026 |
| 190 | McMurrey, R. J., Production Comp | Tyler, TX 75711 | Oil & Gas Operator | Apr 2026 |
| 191 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 192 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Apr 2026 |
| 193 | Moody Oil Co. | Pearsall, TX 78061 | Oil & Gas Operator | Apr 2026 |
| 194 | Moss Petroleum Company | Dallas, TX 75207 | Oil & Gas Operator | Apr 2026 |
| 195 | Nautilus Exploration, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Nov 2021 |
| 196 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | Apr 2026 |
| 197 | Nichols, Irl. A. Trust B | Duncan, OK 73534 | Oil & Gas Operator | Sep 2000 |
| 198 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 199 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 200 | Nytex, L.L.C. | Edmond, OK 73083 | Oil & Gas Operator | Feb 2006 |