| 101 | Ironroc Energy | The Woodlands, TX 77381 | Oil & Gas Operator | May 2025 |
| 102 | Jenex Petroleum Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 103 | Jetta Operating Company Inc | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 104 | JHP Operating, LLC | Dallas, TX 75225 | Oil & Gas Operator | May 2025 |
| 105 | Jilpetco, Inc. | Fort Worth, TX 76121 | Oil & Gas Operator | May 2025 |
| 106 | Kachina Oil & Gas Inc. | Austin, TX 78766 | Oil & Gas Operator | Jul 2002 |
| 107 | Karbuhn Oil Company | Tomball, TX 77375 | Oil & Gas Operator | May 2025 |
| 108 | Key Operating & Equipment, Inc. | Midlothian, TX 76065 | Oil & Gas Operator | Nov 2024 |
| 109 | Keystone Exploration, Inc | College Sta, TX 77845 | Oil & Gas Operator | May 2025 |
| 110 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 111 | Kouatli, Aiman M. | Caldwell, TX 77836 | Oil & Gas Operator | May 2025 |
| 112 | Kriti Te Energy, Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 2017 |
| 113 | L & R Drilling Company | Belle Fourche, SD 57717 | Oil & Gas Operator | Dec 1999 |
| 114 | L & R Energy Corporation | Spearman, TX 79081 | Oil & Gas Operator | Nov 2014 |
| 115 | Leexus Oil & Gas L.L.P. | Giddings, TX 78942 | Oil & Gas Operator | Jun 2008 |
| 116 | Leexus Oil LLC | Giddings, TX 78942 | Oil & Gas Operator | May 2025 |
| 117 | Leggett Oil Company | Dallas, TX 75379 | Oil & Gas Operator | Oct 1999 |
| 118 | Lynco Oilfield Equipment, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Aug 2003 |
| 119 | Magnolia Oil & Gas Operating LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 120 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 121 | Majestic Petroleum Corporation | Dallas, TX 75230 | Oil & Gas Operator | Oct 1996 |
| 122 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 123 | Martineau Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2025 |
| 124 | Marwell Petroleum LTD Partnrship | Houston, TX 77027 | Oil & Gas Operator | May 2025 |
| 125 | Marwell Petroleum, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2006 |
| 126 | Matrix Petroleum, LLC | Houston, TX 77077 | Oil & Gas Operator | May 2025 |
| 127 | McDaniel Company, Inc., The | Dallas, TX 75230 | Oil & Gas Operator | May 2025 |
| 128 | Megaenergy Operating, Inc. | Edmond, OK 73034 | Oil & Gas Operator | Jul 2015 |
| 129 | Mescalero Energy, Inc. | San Antonio, TX 78231 | Oil & Gas Operator | Aug 2003 |
| 130 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | May 2025 |
| 131 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 132 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 133 | Nitro Oil & Gas, LLC | Cuero, TX 77954 | Oil & Gas Operator | May 2025 |
| 134 | North Lake Resources LLC | Oklahoma City, OK 73132 | Oil & Gas Operator | May 2025 |
| 135 | NRG Resources, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jun 1987 |
| 136 | Ogden Resources Corporation | Bryan, TX 77802 | Oil & Gas Operator | May 2025 |
| 137 | Ogden Resources, LTD. | Bryan, TX 77802 | Oil & Gas Operator | Feb 2009 |
| 138 | Ows Energy, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2025 |
| 139 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 140 | Paleo Oil Company LLC | Corpus Chrsti, TX 78411 | Oil & Gas Operator | May 2025 |
| 141 | Paradigm Exploration, L.P. | La Grange, TX 78945 | Oil Operator | Sep 2008 |
| 142 | Parkway Petroleum, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Jul 1997 |
| 143 | Patterson Petroleum, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Feb 2000 |
| 144 | Peters Petroleum Corporation | Dallas, TX 75243 | Oil & Gas Operator | Jan 2014 |
| 145 | Pharaoh & Associates, Inc. | Houston, TX 77252 | Oil & Gas Operator | Aug 2002 |
| 146 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 147 | Ram Energy LLC | Tulsa, OK 74152 | Oil & Gas Operator | Feb 2025 |
| 148 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | May 2025 |
| 149 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 150 | Ranger Oil Company | Canada, 00100 | Oil & Gas Operator | Sep 2001 |
| 151 | Rathburn Land & Devel, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Aug 2003 |
| 152 | Redwood Energy, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Jul 1997 |
| 153 | Republic Resources, LLC. | San Antonio, TX 78212 | Oil & Gas Operator | May 2025 |
| 154 | Reserve Production, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Mar 2008 |
| 155 | Rme Austin Chalk Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2002 |
| 156 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 157 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 158 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | May 2025 |
| 159 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 160 | San Dia Producing Company | Deanville, TX 77852 | Oil & Gas Operator | May 2025 |
| 161 | Sandel Energy, Inc. | Huntsville, TX 77342 | Oil & Gas Operator | Apr 2004 |
| 162 | Sandel Operating Company | Huntsville, TX 77340 | Oil & Gas Operator | May 2025 |
| 163 | Sanders, Larry E. Trustee | Longview, TX 75606 | Oil & Gas Operator | May 2025 |
| 164 | Sanhall Corporation | Huntsville, TX 77340 | Oil & Gas Operator | Oct 1993 |
| 165 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 166 | Santana Energy Services, LLC | Baton Rouge, LA 70809 | Oil & Gas Operator | May 2025 |
| 167 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 168 | Senora Resources, Inc. | Dime Box, TX 77853 | Oil & Gas Operator | May 2025 |
| 169 | Shield Petroleum | College Sta, TX 77845 | Oil & Gas Operator | May 2025 |
| 170 | Showdown Operating, Inc. | Dallas, TX 75230 | Oil & Gas Operator | May 1996 |
| 171 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 172 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 173 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 174 | Southwest Resources, Inc. | Brenham, TX 77834 | Oil & Gas Operator | May 2025 |
| 175 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 176 | Stanton Mineral Development Inc | Austin, TX 78759 | Oil & Gas Operator | May 2025 |
| 177 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 178 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | May 2025 |
| 179 | Stroud Energy, LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2006 |
| 180 | Stroud Oil Properties, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2013 |
| 181 | Summit Exploration, L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2008 |
| 182 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | May 2025 |
| 183 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 184 | Swope Corp. | Austin, TX 78735 | Oil & Gas Operator | May 2025 |
| 185 | Talon Development Company | Boerne, TX 78006 | Oil & Gas Operator | Sep 2007 |
| 186 | Tex-Lee Operating Company | Giddings, TX 78942 | Oil & Gas Operator | May 2025 |
| 187 | Texas Vanguard Oil Company | Austin, TX 78720 | Oil & Gas Operator | Jan 2014 |
| 188 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 189 | Tres Operating Co., LLC | Katy, TX 77494 | Oil Operator | May 2025 |
| 190 | Tularosa Operating Company | Kerrville, TX 78029 | Oil & Gas Operator | Mar 2024 |
| 191 | Txu Fuel Company | Dallas, TX 75201 | Oil & Gas Operator | May 2004 |
| 192 | U. S. Operating, Inc. | Dallas, TX 75252 | Oil & Gas Operator | May 2025 |
| 193 | Ultra Oil & Gas, Inc. | Centerton, AR 72719 | Oil & Gas Operator | May 2025 |
| 194 | Union Pacific Austin Chalk Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Jan 2001 |
| 195 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 196 | United Oil & Minerals, Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2001 |
| 197 | Uplands Resources Inc | Tulsa, OK 74103-4141 | Oil & Gas Operator | Feb 2025 |
| 198 | Usfg Oil & Gas, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Dec 2005 |
| 199 | Vega Operating Company | Eaton, CO 80615 | Oil & Gas Operator | May 2025 |
| 200 | Verdun Oil & Gas LLC | Houston, TX 77024 | Oil & Gas Operator | May 2025 |