| 101 | Henry, John Petroleum | Dallas, TX 75225 | Oil & Gas Operator | Dec 2001 |
| 102 | Herd Producing Company, Inc. | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 103 | Hibbard Energy, LP | Whitehouse, TX 75791 | Oil & Gas Operator | May 2025 |
| 104 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | May 2025 |
| 105 | Holley Oil Company, LLC | Chappell Hill, TX 77426 | Oil & Gas Operator | May 2025 |
| 106 | Houston Gulf Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 107 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | May 2025 |
| 108 | Howitzer Operating, LLC | Dallas, TX 75380 | Oil Operator | May 2025 |
| 109 | Huber Energy L.P. | Houston, TX 77079 | Oil & Gas Operator | Feb 2007 |
| 110 | Huber Energy Panhandle LP | Houston, TX 77079 | Oil & Gas Operator | Oct 2005 |
| 111 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | May 2025 |
| 112 | Hunter Petroleum Inc. | Alice, TX 78333 | Oil & Gas Operator | May 2014 |
| 113 | Hurd Enterprises, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | May 2025 |
| 114 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 115 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 116 | Ironroc Energy | The Woodlands, TX 77381 | Oil & Gas Operator | May 2025 |
| 117 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | May 2025 |
| 118 | Jetta Operating Company Inc | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 119 | JHP Operating, LLC | Dallas, TX 75225 | Oil & Gas Operator | May 2025 |
| 120 | Jilpetco, Inc. | Fort Worth, TX 76121 | Oil & Gas Operator | May 2025 |
| 121 | Keith F. Walker Oil & Gas Co., LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2025 |
| 122 | King Operating Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | May 2025 |
| 123 | Lama Energy, L.L.C. | Midland, TX 79710 | Oil & Gas Operator | May 2024 |
| 124 | Laredo Energy Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2022 |
| 125 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | May 2025 |
| 126 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 127 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 128 | Lonestar Operating, LLC | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 129 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 130 | LRR Pecos Valley, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 131 | Magnolia Oil & Gas Operating LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 132 | Manziel Management Corporation | Tyler, TX 75711 | Oil Operator | Feb 2014 |
| 133 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 134 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 135 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 136 | McCombs Energy LLC | Houston, TX 77056 | Oil & Gas Operator | Jan 2006 |
| 137 | McCool John E | Youngsville, PA 16371 | Oil & Gas Operator | Mar 2025 |
| 138 | McDaniel Company, Inc., The | Dallas, TX 75230 | Oil & Gas Operator | May 2025 |
| 139 | Merrion Oil & Gas Corp | Farmington, NM 87401 | Oil & Gas Operator | Mar 2025 |
| 140 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 141 | Miller Energy Inc | Houston, TX 77024 | Oil & Gas Operator | Oct 2016 |
| 142 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | May 2025 |
| 143 | Mitchell Energy Company L.P. | Spring, TX 77387 | Oil & Gas Operator | Mar 2008 |
| 144 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 145 | ML Resources, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 146 | Morgan Creek Gas Processing Co. | Houston, TX 77027 | Gas Operator | Aug 1998 |
| 147 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 148 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 149 | Nichols,Edwin S Explorations Inc | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 150 | Nitro Oil & Gas, LLC | Cuero, TX 77954 | Oil & Gas Operator | May 2025 |
| 151 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 152 | Northfield Enterprises | Bryan, TX 77805 | Oil & Gas Operator | Dec 1993 |
| 153 | Northfield Enterprises, Inc. | Bryan, TX 77805 | Oil & Gas Operator | May 2025 |
| 154 | O'Benco, Inc. | Shreveport, LA 71136 | Oil & Gas Operator | May 2025 |
| 155 | Obax Oil And Gas LLC | Saint Louis, MO 63131 | Oil Operator | May 2025 |
| 156 | Ogden Resources Corporation | Bryan, TX 77802 | Oil & Gas Operator | May 2025 |
| 157 | Okie Operating Company, LTD. | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 158 | Olipdp II, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2025 |
| 159 | Orr Production Company | Austin, TX 78746 | Oil & Gas Operator | Dec 2000 |
| 160 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 161 | Ows Energy, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2025 |
| 162 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 163 | Paleo Oil Company LLC | Corpus Chrsti, TX 78411 | Oil & Gas Operator | May 2025 |
| 164 | Panhandle Oil & Gas Inc | Oklahoma City, OK 73112-5688 | Oil & Gas Operator | May 2007 |
| 165 | Patterson Petroleum LLC | Snyder, TX 79550 | Oil & Gas Operator | Oct 2007 |
| 166 | Patterson Petroleum LP | Snyder, TX 79550 | Oil & Gas Operator | Mar 2008 |
| 167 | Patterson Petroleum, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Feb 2000 |
| 168 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | Feb 2025 |
| 169 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 170 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 171 | Pickens Company, Inc., The | Dallas, TX 75225 | Oil & Gas Operator | Jul 2024 |
| 172 | Pierce Operating Company, L.L.C. | Bryan, TX 77808 | Oil & Gas Operator | Dec 2018 |
| 173 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | May 2025 |
| 174 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 175 | Premier Natural Resources II,LLC | Tulsa, OK 74105 | Oil & Gas Operator | Feb 2015 |
| 176 | Prime Western Development, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Dec 1998 |
| 177 | Proline Energy Resources Inc | Sugar Land, TX 77479 | Oil & Gas Operator | May 2025 |
| 178 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | May 2025 |
| 179 | Ranger O & G Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 180 | Red Willow Production, LLC | Ignacio, CO 81137 | Oil & Gas Operator | Oct 2015 |
| 181 | Regent Oil & Gas Company, L.P. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2006 |
| 182 | Reserve Production, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Mar 2008 |
| 183 | RHC Energy (USA) LLC | Houston, TX 77027 | Oil Operator | May 2025 |
| 184 | Rippy Oil Company | Tyler, TX 75702 | Oil & Gas Operator | May 2025 |
| 185 | Rivershore Operating LLC | Dallas, TX 75206 | Oil & Gas Operator | May 2025 |
| 186 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 187 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 188 | Ro-Jo, Inc. | Highland VLG, TX 75077 | Oil & Gas Operator | Aug 2003 |
| 189 | Robbins Energy, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 1994 |
| 190 | Rocc Operating, LLC | Houston, TX 77084 | Oil & Gas Operator | May 2025 |
| 191 | Rockefeller Hughes (USA) LLC | Houston, TX 77027 | Oil & Gas Operator | Jul 2015 |
| 192 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 193 | Rusk Energy Operating LLC | Houston, TX 77040 | Oil & Gas Operator | May 2025 |
| 194 | Sabinal Resources, Inc. | Kingwood, TX 77339 | Oil & Gas Operator | May 2025 |
| 195 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | May 2025 |
| 196 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 197 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 198 | Saxet Operating Co.,Inc. | Madisonville, TX 77864 | Oil & Gas Operator | May 2025 |
| 199 | SDG Operating Company, Inc | Tyler, TX 75701 | Oil & Gas Operator | May 2025 |
| 200 | Shelby Boswell Operator, LLC | Dallas, TX 75225 | Oil & Gas Operator | May 2025 |