| 101 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Oct 2025 |
| 102 | Jet Oil Producers | Coldspring, TX 77331 | Oil & Gas Operator | Mar 2008 |
| 103 | Josey Oil Company | Houston, TX 77019 | Oil & Gas Operator | Jul 2006 |
| 104 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Oct 2025 |
| 105 | Kinder Morgan Tejas Pipeline LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 106 | Konantz, Ronald J. Inc. | Houma, LA 70360 | Oil & Gas Operator | Oct 2025 |
| 107 | KP Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1997 |
| 108 | Legacy Corporation, The | Cedar Park, TX 78613 | Oil & Gas Operator | Jun 2004 |
| 109 | Lewis Oil And Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 110 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 111 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 112 | Locin Oil Corporation | Katy, TX 77494 | Oil & Gas Operator | Oct 2025 |
| 113 | LRR Pecos Valley, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 114 | Luca Resources Group, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 115 | Maersk Energy Inc. | Houston, TX 77042 | Oil & Gas Operator | Oct 1994 |
| 116 | Magna Oil & Gas Corporation | Irving, TX 75017 | Oil & Gas Operator | Feb 2016 |
| 117 | Magnolia Oil & Gas Operating LLC | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 118 | Magnum Producing & Operating Co. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jan 2004 |
| 119 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2025 |
| 120 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Aug 2025 |
| 121 | Mariner Energy, Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 122 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Jun 2025 |
| 123 | MBX Operating LLC | Houston, TX 77007 | Oil & Gas Operator | Oct 2025 |
| 124 | McCarthy Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Oct 2007 |
| 125 | McGehee, George T. Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Oct 1997 |
| 126 | McRae Exploration & Prod., Inc. | Houston, TX 77064 | Oil & Gas Operator | Feb 2017 |
| 127 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 128 | Merritt Operating, Inc. | Mineola, TX 75773 | Oil & Gas Operator | Oct 2025 |
| 129 | Merritt, William Kevin | Dallas, TX 75225 | Oil & Gas Operator | Dec 1994 |
| 130 | Mitchell Energy Company L.P. | Spring, TX 77387 | Oil & Gas Operator | Mar 2008 |
| 131 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 132 | MLC Operating, LP | Houston, TX 77063 | Oil & Gas Operator | Oct 2025 |
| 133 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 134 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2025 |
| 135 | Nasser Oil & Gas, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 1998 |
| 136 | Neumin Production Company | Point Comfort, TX 77978 | Oil & Gas Operator | Oct 2025 |
| 137 | O'Sand Production, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Aug 2003 |
| 138 | Occidental Energy Company, Inc. | Houston, TX 77282 | Oil & Gas Operator | Jul 2021 |
| 139 | Oil Lease Operating Co. | Coldspring, TX 77331 | Oil & Gas Operator | Aug 2003 |
| 140 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 141 | Paragon Energy, Inc. | Dallas, TX 75244 | Oil & Gas Operator | Oct 2025 |
| 142 | Petroleum Capital, L.C. | Dallas, TX 75367 | Oil & Gas Operator | Oct 2025 |
| 143 | Pharaoh Oil & Gas, Inc. | MC Camey, TX 79752 | Oil & Gas Operator | Oct 2025 |
| 144 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 145 | Pine Ridge Operating, L.P. | Waelder, TX 78959 | Oil & Gas Operator | Oct 2025 |
| 146 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 147 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 148 | Quisto Energy Corp. | Kerrville, TX 78029 | Oil & Gas Operator | Jan 1998 |
| 149 | Rana Energy Company | Spring, TX 77387 | Oil & Gas Operator | Mar 2008 |
| 150 | Raven Forest Operating, LLC | H SPG NTL PK, AR 71909 | Oil & Gas Operator | Oct 2025 |
| 151 | Resaca Resources, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 152 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 153 | Rodel Oil & Gas Company | Houston, TX 77218 | Oil & Gas Operator | Oct 2025 |
| 154 | Roosth & Genecov Production Co. | Tyler, TX 75710 | Oil & Gas Operator | Aug 2003 |
| 155 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 156 | Rse, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2000 |
| 157 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 158 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 159 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 160 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 161 | Sandel Operating Company | Huntsville, TX 77340 | Oil & Gas Operator | Oct 2025 |
| 162 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 163 | SDG Operating Company, Inc | Tyler, TX 75701 | Oil & Gas Operator | Oct 2025 |
| 164 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 165 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Oct 2025 |
| 166 | Slaughter J M Oil Company | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2001 |
| 167 | Smith, L C Production | Jacksonville, TX 75766 | Oil Operator | Oct 2025 |
| 168 | Smith, L. C. | Jacksonville, TX 75766 | Oil & Gas Operator | Oct 2025 |
| 169 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 170 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 171 | Southwest Resources, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Oct 2025 |
| 172 | Spri Oil & Gas, LLC | Houston, TX 77090 | Oil & Gas Operator | Mar 2020 |
| 173 | Stardust Leasing, Inc. | Richmond, TX 77469 | Oil & Gas Operator | Jul 1999 |
| 174 | Stasney, H. R. & Sons, LTD. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 175 | Stratlynn, Inc. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 176 | Sue-Ann Production Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 177 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Oct 2025 |
| 178 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 179 | Sydri Operating, LLC | Dallas, TX 75231 | Oil & Gas Operator | Oct 2025 |
| 180 | Tahiti PTRS Enrgy Solutions Corp | Long Beach, CA 90807 | Oil Operator | Oct 2025 |
| 181 | Tartan Resources Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 1995 |
| 182 | Taurus Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 183 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | Oct 2025 |
| 184 | Texstar North America, Inc. | Waynesboro, MS 39367 | Oil & Gas Operator | Aug 1994 |
| 185 | Thornberry Oilfield Service, Inc | Conroe, TX 77302 | Oil & Gas Operator | Aug 2003 |
| 186 | Total E&P USA, Inc. | Houston, TX 77210 | Oil & Gas Operator | May 2025 |
| 187 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 188 | Trans-Pecos Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 189 | Treadstone Energy PRTNR Op, LLC | Katy, TX 77494 | Oil & Gas Operator | Oct 2025 |
| 190 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 191 | Triple J Investments Inc | Longview, TX 75606 | Oil & Gas Operator | Feb 2023 |
| 192 | Trousil & Associates, Inc. | Steamboat SPG, CO 80477 | Oil & Gas Operator | Dec 2006 |
| 193 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 194 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Oct 2025 |
| 195 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 196 | Wapiti Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Jul 2006 |
| 197 | Wapiti Operating, LLC | Houston, TX 77043 | Oil & Gas Operator | Oct 2025 |
| 198 | WBR, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Sep 1995 |
| 199 | Western Energy Group, LLC | Leander, TX 78641 | Oil & Gas Operator | Oct 2025 |
| 200 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |