| 101 | Eastland Oil Company, The | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 102 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 103 | Elam, Jack G. | Midland, TX 79702 | Oil & Gas Operator | Dec 2002 |
| 104 | Elam, Jack G., Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2002 |
| 105 | Emerald Petroleum Corporation | Dallas, TX 75244 | Oil & Gas Operator | Apr 2002 |
| 106 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 107 | Energy Transfer Crude Marketing LLC | Houston, TX 77002 | Oil Operator | Dec 2024 |
| 108 | Enrich Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 109 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 110 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 111 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 112 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Dec 2024 |
| 113 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 114 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 115 | Fagadau Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2006 |
| 116 | Falcon Creek Resources, Inc. | Tulsa, OK 74137 | Oil & Gas Operator | Apr 2001 |
| 117 | Fasken Oil And Ranch, LTD. | Midland, TX 79707 | Oil & Gas Operator | Mar 2025 |
| 118 | Fasken, Barbara | Midland, TX 79701 | Oil & Gas Operator | Dec 1995 |
| 119 | Finaly Resources LLC | Sunset Beach, CA 90742 | Oil & Gas Operator | Mar 2025 |
| 120 | Fletcher Petroleum Corp. | Fairhope, AL 36533 | Oil & Gas Operator | Nov 2024 |
| 121 | Fortson Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2020 |
| 122 | Four Sevens Oil Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2001 |
| 123 | Fuller Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1995 |
| 124 | Fuller Production, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 125 | Future Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 1999 |
| 126 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 127 | Gaea Services, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2021 |
| 128 | Gardner Energy Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 1999 |
| 129 | Ginnings Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2025 |
| 130 | Grace Petroleum Operating, LLC | Llano, TX 78643 | Oil & Gas Operator | Mar 2025 |
| 131 | Grayrock Energy II, LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Mar 2025 |
| 132 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 133 | Guinn Investments, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2018 |
| 134 | Gunn Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 135 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 136 | Hadaway Consult And Engineer,LLC | Canadian, TX 79014 | Oil & Gas Operator | Mar 2025 |
| 137 | Halliburton Operating Company | Plano, TX 75093 | Oil & Gas Operator | Mar 2025 |
| 138 | Halvey Energy Co. | Midland, TX 79702 | Oil & Gas Operator | Oct 2004 |
| 139 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
| 140 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | Mar 2025 |
| 141 | Hanley Petroleum Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 142 | Hanson Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 143 | Hastings, J. W. Oil Co. | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2010 |
| 144 | Hce Operating LLC | Smyer, TX 79367 | Oil & Gas Operator | Mar 2025 |
| 145 | Headline Resources, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Aug 1997 |
| 146 | Henderson & Erickson, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 147 | Henson Exploration, L.P. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 148 | HGN Operating I, LLC | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 149 | High Island Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2017 |
| 150 | Hofco, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 151 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Mar 2025 |
| 152 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 153 | Hughes, Dan A. Company | Beeville, TX 78104 | Oil & Gas Operator | May 2006 |
| 154 | Hughes, Dan A. Company, L.P. | Beeville, TX 78104 | Oil & Gas Operator | Mar 2025 |
| 155 | HW Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 156 | J & J Trading | Abilene, TX 79608 | Oil & Gas Operator | Dec 2004 |
| 157 | Jin Petroleum LLC | New Braunfels, TX 78130 | Oil Operator | Mar 2025 |
| 158 | JM Cox Resources LP | Midland, TX 79702 | Oil & Gas Operator | Apr 2019 |
| 159 | Johnson Royalties, Inc. | Austin, TX 78729 | Oil & Gas Operator | Jul 2002 |
| 160 | Johnson Sanford Op Co., LTD | Leander, TX 78641 | Oil & Gas Operator | Mar 2025 |
| 161 | Joint Resources Company | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2025 |
| 162 | Kana Resources, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Aug 2003 |
| 163 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Jan 2025 |
| 164 | Kimsey, Roy E., Jr. | Midland, TX 79701 | Oil & Gas Operator | May 2018 |
| 165 | Klabzuba Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2013 |
| 166 | Knox Industries, Inc. | Arlington, TX 76012 | Oil & Gas Operator | Mar 2025 |
| 167 | Kojo Energy, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Mar 2025 |
| 168 | Krocan Energy Corporation | Bowling Green, KY 42102 | Oil & Gas Operator | Mar 2025 |
| 169 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 170 | Lakewood Operating, LTD. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 171 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Mar 2025 |
| 172 | Las Colinas Oil Corp. | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 173 | Leclair Operating Co., Inc. | Abilene, TX 79602 | Oil & Gas Operator | Mar 2025 |
| 174 | Leclair Operating, L.L.C. | Abilene, TX 79602 | Oil & Gas Operator | Mar 2025 |
| 175 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Mar 2025 |
| 176 | Lone Star Operations LLC | Lubbock, TX 79401 | Oil & Gas Operator | Mar 2025 |
| 177 | Lovelady, I. W. | Albuquerque, NM 87111 | Oil & Gas Operator | Jan 1996 |
| 178 | Lunar Oil Company | Midland, TX 79708 | Oil & Gas Operator | Feb 1999 |
| 179 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 180 | Lynx Operating Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2025 |
| 181 | M & A Oil Company, LTD. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 182 | M.R.M. Operating, Inc. | Midland, TX 79707 | Oil & Gas Operator | Aug 2003 |
| 183 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 184 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 185 | Maralo, LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 186 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 187 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 188 | Marwell Petroleum LTD Partnrship | Houston, TX 77027 | Oil & Gas Operator | Mar 2025 |
| 189 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2025 |
| 190 | McBee Company, The | Dallas, TX 75219 | Oil & Gas Operator | Dec 1997 |
| 191 | McCann Corporation | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 192 | McClymond, LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2009 |
| 193 | McLeod, George L. Inc. | Houston, TX 77079 | Oil & Gas Operator | Sep 2002 |
| 194 | McShane, J. Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2004 |
| 195 | Medders Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 196 | Melton, Joe, DRLG. Co., Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 197 | Mercury Exploration Co | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 198 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 199 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 200 | Merrion Oil & Gas Corp | Farmington, NM 87401 | Oil & Gas Operator | Jan 2025 |