| 4101 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 4102 | Samson Kelley Operating Co., LTD. | | Oil & Gas Operator | Feb 2004 |
| 4103 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 4104 | Samuel Gary Jr. & Assoc., Inc. | | Oil & Gas Operator | Mar 2023 |
| 4105 | San Miguel Oil & Gas, Inc. | | Oil & Gas Operator | Jan 1993 |
| 4106 | Sananco Energy Corp | Naples, FL 33941 | Oil & Gas Operator | Jul 2013 |
| 4107 | Sanare Energy Partners, LLC | | Oil & Gas Operator | Dec 2024 |
| 4108 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 4109 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 4110 | Sand Hill, LTD. | | Gas Operator | Dec 2024 |
| 4111 | Sandalwood Exploration, L.P. | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 4112 | Sandefer & Andress, Inc. | | Oil & Gas Operator | Apr 1982 |
| 4113 | Sandefer Petroleum Co. | | Oil & Gas Operator | Apr 1994 |
| 4114 | Sandel Energy, Inc. | Huntsville, TX 77342 | Oil & Gas Operator | Apr 2004 |
| 4115 | Sandhill Production Inc | Shongaloo, LA 71072 | Oil & Gas Operator | Dec 2019 |
| 4116 | Sandpoint Energy Partners LLC | | Oil Operator | Jan 2025 |
| 4117 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Dec 2025 |
| 4118 | Sandridge Onshore, LLC | Houston, TX 77010 | Oil & Gas Operator | Jun 2014 |
| 4119 | Santa Fe Braun Inc | Dallas, TX 75240-6620 | Oil & Gas Operator | Mar 1995 |
| 4120 | Santa Fe Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 4121 | Santa Fe Energy Operg Parts LP | | Oil & Gas Operator | Nov 1993 |
| 4122 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 4123 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 4124 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 4125 | Santa Fe-Andover Oil Co | Tulsa, OK 74172 | Oil & Gas Operator | Sep 2000 |
| 4126 | Santana Exploration, Inc. | | Oil & Gas Operator | Dec 1985 |
| 4127 | Sante Fe Minerals | | Oil & Gas Operator | Dec 1987 |
| 4128 | Santo Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 4129 | Santos USA Corp. | Houston, TX 77042 | Oil & Gas Operator | Dec 2008 |
| 4130 | Sapient Energy Corp | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2002 |
| 4131 | Sasha Petroleum, Inc | | Oil Operator | Jan 1986 |
| 4132 | Savant Energy Corporation | | Oil & Gas Operator | Mar 2012 |
| 4133 | Sawyer Drilling & Service Inc. | | Oil & Gas Operator | Oct 2004 |
| 4134 | Sawyer Energy, Inc. | | Oil & Gas Operator | May 1997 |
| 4135 | Saxon Oil & Gas Expl., Inc. | | Gas Operator | Nov 1989 |
| 4136 | Saxon Oil Company | Dallas, TX 75204 | Oil & Gas Operator | Oct 2009 |
| 4137 | Saye Petroleum, Inc. | | Oil & Gas Operator | Apr 1995 |
| 4138 | Sayes Drilling Inc. | | Oil Operator | May 1987 |
| 4139 | SBM Operating Company Inc. | | Gas Operator | Sep 1997 |
| 4140 | Scana Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 4141 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 4142 | Sceptre Resources Inc | | Oil & Gas Operator | Dec 2007 |
| 4143 | Schmid Properties, Inc. | Hico, TX 76457 | Oil & Gas Operator | Dec 2025 |
| 4144 | Scogin Exploration Inc | | Oil & Gas Operator | Dec 1999 |
| 4145 | Scorpion Oil & Gas, LLC | Houston, TX 77036 | Oil & Gas Operator | May 2025 |
| 4146 | Scott W. Brumley | | Oil Operator | Apr 2011 |
| 4147 | Scurlock Oil Co | | Oil Operator | May 1982 |
| 4148 | SDG Services LLC | Kilgore, TX 75663 | Oil Operator | Sep 2025 |
| 4149 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 4150 | Seaboard Pipe & Equip. Co. | | Oil & Gas Operator | May 1977 |
| 4151 | Seaboard Well Service, Inc. | | Oil & Gas Operator | Jan 1978 |
| 4152 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 4153 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 4154 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 4155 | Seahawk Oil & Gas Company | Dallas, TX 75379 | Oil & Gas Operator | Aug 2007 |
| 4156 | Seal Energy Company | | Oil Operator | Dec 2024 |
| 4157 | Sealexco | | Oil & Gas Operator | Jun 1992 |
| 4158 | Sealexco-Crescent Drilling | | Oil & Gas Operator | May 1986 |
| 4159 | Seawide Limited | | Oil & Gas Operator | Jul 1983 |
| 4160 | Secan Oil Co Inc | | Oil & Gas Operator | May 1987 |
| 4161 | Secan Oil Co., Inc.-Pennington | | Oil & Gas Operator | May 1987 |
| 4162 | Secondary Recovery, Inc. | | Oil & Gas Operator | Dec 1991 |
| 4163 | Sedona Oil & Gas Corporation | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 4164 | Segars Operating | | Gas Operator | Apr 2014 |
| 4165 | Sei Operating, LLC | Mandeville, LA 70471 | Oil & Gas Operator | Dec 2025 |
| 4166 | Semo, Inc. | | Oil & Gas Operator | Feb 2002 |
| 4167 | Sendero Energy Inc. | Dallas, TX 75205 | Oil & Gas Operator | Dec 2025 |
| 4168 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 4169 | Seneca-Cashco | | Oil & Gas Operator | Sep 1986 |
| 4170 | Senior Drilling & Expl Co Inc. | | Oil & Gas Operator | Apr 1993 |
| 4171 | Senior G&A Operating Co Inc | | Oil & Gas Operator | Nov 1991 |
| 4172 | Sensor Oil & Gas, Inc. | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 4173 | Sepulvado Oilfield Service Inc | | Oil & Gas Operator | Jul 2010 |
| 4174 | Serio Energy Corporation | | Oil & Gas Operator | Jul 2000 |
| 4175 | Serio Exploration Company | | Oil Operator | Jan 1992 |
| 4176 | Serio Oil Corp. | | Oil & Gas Operator | Sep 1991 |
| 4177 | Serio Operating Co. | | Oil & Gas Operator | Mar 2007 |
| 4178 | Ses Production | | Oil & Gas Operator | Oct 2023 |
| 4179 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 4180 | Settco Oil & Gas | | Oil & Gas Operator | May 1994 |
| 4181 | Sevarg Company, Inc. | | Oil & Gas Operator | Feb 2016 |
| 4182 | Sewell Development Co Inc | | Oil & Gas Operator | Apr 1993 |
| 4183 | SG Interests, Inc. | Houston, TX 77010 | Oil & Gas Operator | Jun 2007 |
| 4184 | Shadrack Production Company | | Gas Operator | Dec 1982 |
| 4185 | Shale Energy International, LLC | | Oil & Gas Operator | Nov 2024 |
| 4186 | Shana Petroleum Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2002 |
| 4187 | Shannon Williams | | Oil Operator | Jan 1993 |
| 4188 | Shaw-Laird, LLC | | Oil & Gas Operator | Jan 2017 |
| 4189 | Shelby H. Loe, SR. Oil Co. | | Oil Operator | Jul 1989 |
| 4190 | Shelby Operating Company | Dallas, TX 75205 | Oil & Gas Operator | Dec 2025 |
| 4191 | Shelf Energy, LLC | | Oil & Gas Operator | Dec 2024 |
| 4192 | Shell Offshore Inc. | New Orleans, LA 70161 | Oil & Gas Operator | Jan 2008 |
| 4193 | Shell Oil Co. | Houston, TX 77001 | Oil & Gas Operator | Jun 1985 |
| 4194 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 4195 | Shenandoah Oil Corporation | | Oil & Gas Operator | Jun 1979 |
| 4196 | Sheridan Energy,Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 4197 | Shield Energy Resources, LLC | | Oil Operator | Dec 2024 |
| 4198 | Shiloh Creek Resources, Inc. | | Gas Operator | Nov 2024 |
| 4199 | Shocker Energy, Inc. | | Oil & Gas Operator | Oct 1992 |
| 4200 | Shoco Production, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | May 2020 |