| 101 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 102 | Samis Oil Company, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2000 |
| 103 | Sammax Operating LLC | Snyder, TX 79549 | Oil Operator | Oct 2025 |
| 104 | Sams Energy, Inc. | Abilene, TX 79604 | Oil & Gas Operator | May 1998 |
| 105 | Samson Contour Energy E&P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2017 |
| 106 | Samson Exploration LLC | Tulsa, OK 74101 | Oil & Gas Operator | Aug 2025 |
| 107 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 108 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 109 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 110 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 111 | Samurai Operating Co. L.L.C. | Dayton, TX 77535 | Oil & Gas Operator | Oct 2025 |
| 112 | San Angelo Cetco, Inc. | San Angelo, TX 76901 | Oil & Gas Operator | Mar 1998 |
| 113 | San Antonio Gas & Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2000 |
| 114 | San Cajo Oil Company | Edmonds, WA 98020 | Oil & Gas Operator | Oct 2025 |
| 115 | San Dia Producing Company | Deanville, TX 77852 | Oil & Gas Operator | Oct 2025 |
| 116 | San Isidro Development Co, L. C. | Sandia, TX 78383 | Oil & Gas Operator | Oct 2025 |
| 117 | San Marco Petroleum Inc | Denver, CO 80293 | Oil & Gas Operator | Jun 2025 |
| 118 | San Patricio Corporation | Dinero, TX 78350 | Oil & Gas Operator | Sep 2003 |
| 119 | Sanchez Exploration Company LLC | Houston, TX 77056 | Oil & Gas Operator | Oct 2024 |
| 120 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 121 | Sanchez Production, LLC | Pampa, TX 79065 | Oil & Gas Operator | Oct 2025 |
| 122 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 123 | Sanco Operating Company | Bullard, TX 75757 | Oil & Gas Operator | Oct 2025 |
| 124 | Sand Creek Oil Co., Inc. | Lubbock, TX 79413 | Oil & Gas Operator | Jul 2012 |
| 125 | Sand Dollar, LLC | Henderson, KY 42420 | Oil & Gas Operator | Dec 2018 |
| 126 | Sand Hawk, LLC | Devers, TX 77538 | Oil & Gas Operator | Oct 2025 |
| 127 | Sand River O & E LLC | Amarillo, TX 79107 | Gas Operator | Dec 2004 |
| 128 | Sand Springs Oil & Gas Co. | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2025 |
| 129 | Sandalwood Exploration, L.P. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 130 | Sandalwood Oil & Gas, Inc. | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 131 | Sandco Oil & Gas, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2015 |
| 132 | Sandel Energy, Inc. | Huntsville, TX 77342 | Oil & Gas Operator | Apr 2004 |
| 133 | Sandel Operating Company | Huntsville, TX 77340 | Oil & Gas Operator | Oct 2025 |
| 134 | Sanders & Smith, L.C. | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2004 |
| 135 | Sanders Energy LLC | Aledo, TX 76008 | Oil & Gas Operator | Oct 2025 |
| 136 | Sanders Oil & Gas, LTD. | Granbury, TX 76048 | Oil & Gas Operator | Aug 2015 |
| 137 | Sanders, Larry E. Trustee | Longview, TX 75606 | Oil & Gas Operator | Oct 2025 |
| 138 | Sandhawk Energy, LLC | Houston, TX 77079 | Oil & Gas Operator | Jun 2011 |
| 139 | Sandhill Production Inc | Shongaloo, LA 71072 | Oil & Gas Operator | Dec 2019 |
| 140 | Sandhills Oil Co. | Copan, OK 74022 | Oil Operator | Aug 1997 |
| 141 | Sandia Energy Corporation-NM | Holdenville, OK 74848 | Oil & Gas Operator | Aug 2003 |
| 142 | Sandia Operating Corp. | San Antonio, TX 78270 | Oil & Gas Operator | May 2010 |
| 143 | Sandia Production Co., Inc. | Corrales, NM 87048 | Oil & Gas Operator | Oct 2025 |
| 144 | Sandlot Oil & Gas LLC | Gruver, TX 79040 | Oil & Gas Operator | Oct 2025 |
| 145 | Sandman Exploration, L.L.C. | Georgetown, TX 78627 | Oil & Gas Operator | Oct 2025 |
| 146 | Sandollar Oil & Gas, Inc. | Hallsville, TX 75650 | Oil & Gas Operator | Feb 1993 |
| 147 | Sandor Petroleum Corporation | Crane, TX 79731 | Oil & Gas Operator | Oct 2025 |
| 148 | Sandpoint Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2025 |
| 149 | Sandpoint Texas LLC | Houston, TX 77270 | Oil Operator | Oct 2025 |
| 150 | Sandridge Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2018 |
| 151 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Oct 2025 |
| 152 | Sandridge Offshore, LLC | Houston, TX 77042 | Oil & Gas Operator | Apr 2014 |
| 153 | Sandridge Onshore, LLC | Houston, TX 77010 | Oil & Gas Operator | Jun 2014 |
| 154 | Sandridge Tertiary, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2012 |
| 155 | Sandstone Operating Company, Inc | Odessa, TX 79762 | Oil & Gas Operator | Jul 1995 |
| 156 | Sandstone Resources, Inc. | Houston, TX 77043 | Oil & Gas Operator | Oct 2025 |
| 157 | Sandstone Services, LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 158 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2025 |
| 159 | Sanguine, LTD | Tulsa, OK 74170 | Gas Operator | Oct 2003 |
| 160 | Sanhall Corporation | Huntsville, TX 77340 | Oil & Gas Operator | Oct 1993 |
| 161 | Santa Anna Operating 3, LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Oct 2025 |
| 162 | Santa Anna Operating Co I, LLC | Abilene, TX 79608 | Oil & Gas Operator | Oct 2018 |
| 163 | Santa Fe Energy Oper. Part., LP | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 164 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 165 | Santa Fe Exploration Company | Lubbock, TX 79408 | Oil & Gas Operator | Nov 1997 |
| 166 | Santa Fe Operating LLC | Frisco, TX 75034 | Oil & Gas Operator | Oct 2025 |
| 167 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 168 | Santa Rosa Operating, LLC | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Oct 2025 |
| 169 | Santana Energy Services, LLC | Baton Rouge, LA 70809 | Oil & Gas Operator | Oct 2025 |
| 170 | Santerra Oil & Gas, Inc. | Seagoville, TX 75159 | Oil & Gas Operator | Oct 2025 |
| 171 | Santo Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 172 | Santos USA Corp. | Houston, TX 77042 | Oil & Gas Operator | Dec 2008 |
| 173 | Saphire Energy | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 174 | Sapient Energy Corp | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2002 |
| 175 | Saratoga Energy Corporation | Sourlake, TX 77659 | Oil & Gas Operator | Dec 2004 |
| 176 | Saratoga Oil Company | Batson, TX 77519 | Oil & Gas Operator | Oct 2025 |
| 177 | Saratoga Production Company LLC | Sourlake, TX 77659 | Oil Operator | Oct 2025 |
| 178 | Saratoga Resources, Inc. | Houston, TX 77077 | Oil & Gas Operator | Jul 1994 |
| 179 | Sargeco, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Sep 2018 |
| 180 | Sargent, Jo Ann | Holliday, TX 76366 | Oil & Gas Operator | Aug 2003 |
| 181 | Sarita Energy Resources, LTD. | Houston, TX 77277 | Oil & Gas Operator | Oct 2025 |
| 182 | Sarita Oil & Gas | Boerne, TX 78006 | Oil & Gas Operator | Jul 2024 |
| 183 | Sarrita Oil Co., Inc. | Floresville, TX 78114 | Oil & Gas Operator | Jul 2002 |
| 184 | Sassco Petroleum, Inc. | Austin, TX 78763 | Oil & Gas Operator | Feb 2000 |
| 185 | Satanta Oil Company | Midland, TX 79704 | Oil & Gas Operator | Oct 2025 |
| 186 | Satex Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Aug 2003 |
| 187 | Saturn Oil And Development Corp. | Carlsbad, NM 88220 | Oil & Gas Operator | Oct 2025 |
| 188 | Sauder Management Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 189 | Saur, Jerry | Luling, TX 78648 | Oil & Gas Operator | Dec 2015 |
| 190 | Savage Exploration, Inc. | San Marcos, TX 78666 | Oil & Gas Operator | Oct 2025 |
| 191 | Savannah Oil Co. | Jefferson, TX 75657 | Oil & Gas Operator | Nov 2007 |
| 192 | Savannah Ross And Company, LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 193 | Saved By Grace Plugging, LLC | Tuscola, TX 79562 | Oil & Gas Operator | Dec 2018 |
| 194 | Savior Oil Company | Allen, TX 75013 | Oil Operator | Nov 2015 |
| 195 | Sawtooth Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 196 | Sawtooth, Inc. | Houston, TX 77024 | Oil & Gas Operator | Dec 2013 |
| 197 | Saxet Energy, LTD. | Houston, TX 77057 | Oil & Gas Operator | Mar 2004 |
| 198 | Saxet Exploration Ent. Co., Inc. | Fulshear, TX 77441 | Oil Operator | Oct 2025 |
| 199 | Saxet Oil Corporation | Midland, TX 79708 | Oil & Gas Operator | Oct 2025 |
| 200 | Saxet Operating Co.,Inc. | Madisonville, TX 77864 | Oil & Gas Operator | Oct 2025 |