| 101 | Houston Energy Operating, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jul 2020 |
| 102 | Houston Hydrocarbons, Inc. (A) | Houston, TX 77042 | Oil & Gas Operator | Sep 2004 |
| 103 | HRB Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Oct 2025 |
| 104 | Hunt Petroleum (Aec), Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 105 | Indexgeo & Associates, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2009 |
| 106 | Irish Oil & Gas Co. | Houston, TX 77242 | Oil & Gas Operator | Aug 2003 |
| 107 | Iron Ridge Operating, LLC | Austin, TX 78738 | Oil & Gas Operator | Oct 2025 |
| 108 | Ironroc Energy | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 109 | Jamex, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | Oct 2025 |
| 110 | Jasper Operating Company | Dallas, TX 75206 | Oil & Gas Operator | Jun 2002 |
| 111 | Jay Management Company LLC | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 112 | Jeffcoat Production Company Inc. | Spurger, TX 77660 | Oil & Gas Operator | Oct 2024 |
| 113 | JTL Operating Co Inc | Katy, TX 77450 | Oil & Gas Operator | Oct 2025 |
| 114 | K-B Exploration Co. | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 115 | Kem Energy, Inc. | Katy, TX 77450 | Oil & Gas Operator | Oct 2025 |
| 116 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | May 2025 |
| 117 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 118 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 119 | Key Petroleum Inc. | Houston, TX 77056 | Oil & Gas Operator | Aug 2003 |
| 120 | Kidd Production Co. | Luling, TX 78648 | Oil & Gas Operator | Oct 2025 |
| 121 | Kodiak Petroleum, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jun 2025 |
| 122 | Krescent Energy Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2013 |
| 123 | Kriti Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2012 |
| 124 | KT Operating Company LLC | Dallas, TX 75231 | Oil & Gas Operator | Feb 2010 |
| 125 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 126 | Lacy Operations, LTD. | Longview, TX 75606 | Oil & Gas Operator | Oct 2012 |
| 127 | Lake Ronel Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Jul 2017 |
| 128 | Lakeshore Operating, LLC | Wichita, KS 67203 | Oil & Gas Operator | Oct 2025 |
| 129 | Lep Development Company, LLC | Houston, TX 77007 | Oil & Gas Operator | Jul 2020 |
| 130 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Jun 2025 |
| 131 | Loin Energy Corporation | La Grange, TX 78945 | Oil & Gas Operator | Oct 2025 |
| 132 | Lucas Energy, Inc. | Houston, TX 77067 | Oil & Gas Operator | Feb 2017 |
| 133 | M-B Operating Co., Inc. | Rowlett, TX 75030 | Oil & Gas Operator | Oct 2025 |
| 134 | Maersk Energy Inc. | Houston, TX 77042 | Oil & Gas Operator | Oct 1994 |
| 135 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2025 |
| 136 | MBX Operating LLC | Houston, TX 77007 | Oil & Gas Operator | Oct 2025 |
| 137 | McGehee, George T. Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Oct 1997 |
| 138 | McGowen Resources Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2003 |
| 139 | Memorial Exploration Company | Saint Louis, MO 63105 | Oil & Gas Operator | Aug 1996 |
| 140 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 141 | Mid Texas Natural Gas | Kyle, TX 78640 | Oil & Gas Operator | May 2019 |
| 142 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Oct 2025 |
| 143 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 144 | Morris, W. Dale Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Oct 2025 |
| 145 | Murphy Exploration & Prod. Co. | Houston, TX 77094 | Oil & Gas Operator | Jun 2011 |
| 146 | Murphy Oil USA Inc | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 147 | Neches Transport Inc. | Spurger, TX 77660 | Oil & Gas Operator | Oct 2025 |
| 148 | New Century Exploration, Inc. | Spring, TX 77379 | Oil & Gas Operator | Oct 2025 |
| 149 | Noble Exploration, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Aug 2003 |
| 150 | Nobleson Operating, Inc. | Dallas, TX 75244 | Oil & Gas Operator | Jun 1996 |
| 151 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 152 | Nuevo Energy Company | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 153 | Odessa Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 154 | Olipdp II, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Oct 2025 |
| 155 | Origin Production Group LLC | Luling, TX 78648 | Oil Operator | Oct 2025 |
| 156 | Oro Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 157 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 158 | P.O.S. Energy, Inc. | Buna, TX 77612 | Oil & Gas Operator | Oct 2025 |
| 159 | Paleo Oil Company LLC | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Oct 2025 |
| 160 | Panther Bayou Energy, LLC | Houston, TX 77070 | Oil & Gas Operator | Apr 2021 |
| 161 | Parkwood Production, Inc. | Buna, TX 77612 | Oil Operator | Oct 2025 |
| 162 | Pax Energy LTD | Elmhurst, IL 60126 | Oil & Gas Operator | Dec 1998 |
| 163 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | Jul 2025 |
| 164 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 165 | Permian Natural Resources | Pflugerville, TX 78660 | Oil & Gas Operator | Oct 2025 |
| 166 | Petralis Energy Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 167 | Petro-Smith Operating LLC | Houston, TX 77010 | Oil & Gas Operator | Oct 2025 |
| 168 | Petroleum Resource Management Co | Fort Worth, TX 76107 | Oil & Gas Operator | Jan 2024 |
| 169 | Phoenix Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Jul 2022 |
| 170 | Pine Ridge Operating, L.P. | Waelder, TX 78959 | Oil & Gas Operator | Oct 2025 |
| 171 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 172 | Prize Exploration & Prod, LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 173 | Prize Exploration, LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 174 | Proline Energy Resources Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Oct 2025 |
| 175 | Quail Creek Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 176 | R & B Oil Company, LLC | Willis, TX 77318 | Oil & Gas Operator | Oct 2025 |
| 177 | Radius Operating, LLC | Round Rock, TX 78664 | Oil & Gas Operator | Oct 2025 |
| 178 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 179 | Rio Bravo Oil Company | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2002 |
| 180 | Rki Energy Resources, LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2021 |
| 181 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 182 | Roy Jackson Energy Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 183 | Royal Production Company, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2025 |
| 184 | S & S Operating Company, Inc. | Winnie, TX 77665 | Oil & Gas Operator | Oct 2025 |
| 185 | S. M. A. Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1997 |
| 186 | Salt Creek Production, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Oct 2025 |
| 187 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 188 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 189 | Sandalwood Exploration, L.P. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 190 | Shoco Production LLC | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 191 | Shoco Production, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | May 2020 |
| 192 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 193 | Smith Production Inc. | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 194 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 195 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 196 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 197 | Southern Oil Of Louisiana LLC | Madisonville, LA 70447 | Oil & Gas Operator | Oct 2025 |
| 198 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Jul 2025 |
| 199 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 200 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |