| 4101 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 4102 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 4103 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 4104 | Santa Fe-Andover Oil Co | Tulsa, OK 74172 | Oil & Gas Operator | Sep 2000 |
| 4105 | Santana Exploration, Inc. | | Oil & Gas Operator | Dec 1985 |
| 4106 | Sante Fe Minerals | | Oil & Gas Operator | Dec 1987 |
| 4107 | Santo Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 4108 | Santos USA Corp. | Houston, TX 77042 | Oil & Gas Operator | Dec 2008 |
| 4109 | Sapient Energy Corp | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2002 |
| 4110 | Sasha Petroleum, Inc | | Oil Operator | Jan 1986 |
| 4111 | Savant Energy Corporation | | Oil & Gas Operator | Mar 2012 |
| 4112 | Sawyer Drilling & Service Inc. | | Oil & Gas Operator | Oct 2004 |
| 4113 | Sawyer Energy, Inc. | | Oil & Gas Operator | May 1997 |
| 4114 | Saxon Oil & Gas Expl., Inc. | | Gas Operator | Nov 1989 |
| 4115 | Saxon Oil Company | Dallas, TX 75204 | Oil & Gas Operator | Oct 2009 |
| 4116 | Saye Petroleum, Inc. | | Oil & Gas Operator | Apr 1995 |
| 4117 | Sayes Drilling Inc. | | Oil Operator | May 1987 |
| 4118 | SBM Operating Company Inc. | | Gas Operator | Sep 1997 |
| 4119 | Scana Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 4120 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 4121 | Sceptre Resources Inc | | Oil & Gas Operator | Dec 2007 |
| 4122 | Schmid Properties Inc | Hico, TX 76457 | Oil & Gas Operator | May 2025 |
| 4123 | Scogin Exploration Inc | | Oil & Gas Operator | Dec 1999 |
| 4124 | Scorpion Oil & Gas, LLC | Houston, TX 77036 | Oil & Gas Operator | Aug 2024 |
| 4125 | Scott W. Brumley | | Oil Operator | Apr 2011 |
| 4126 | Scurlock Oil Co | | Oil Operator | May 1982 |
| 4127 | SDG Services LLC | Kilgore, TX 75663 | Oil Operator | May 2025 |
| 4128 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 4129 | Seaboard Pipe & Equip. Co. | | Oil & Gas Operator | May 1977 |
| 4130 | Seaboard Well Service, Inc. | | Oil & Gas Operator | Jan 1978 |
| 4131 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 4132 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 4133 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 4134 | Seahawk Oil & Gas Company | Dallas, TX 75379 | Oil & Gas Operator | Aug 2007 |
| 4135 | Seal Energy Company | | Oil Operator | Dec 2024 |
| 4136 | Sealexco | | Oil & Gas Operator | Jun 1992 |
| 4137 | Sealexco-Crescent Drilling | | Oil & Gas Operator | May 1986 |
| 4138 | Seawide Limited | | Oil & Gas Operator | Jul 1983 |
| 4139 | Secan Oil Co., Inc. | | Oil & Gas Operator | May 1987 |
| 4140 | Secan Oil Co., Inc.-Pennington | | Oil & Gas Operator | May 1987 |
| 4141 | Secondary Recovery, Inc. | | Oil & Gas Operator | Dec 1991 |
| 4142 | Sedona Oil & Gas Corporation | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 4143 | Segars Operating | | Gas Operator | Apr 2014 |
| 4144 | Sei Operating, LLC | Mandeville, LA 70471 | Oil & Gas Operator | May 2025 |
| 4145 | Semo, Inc. | | Oil & Gas Operator | Feb 2002 |
| 4146 | Sendero Energy Inc. | Dallas, TX 75205 | Oil & Gas Operator | May 2025 |
| 4147 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 4148 | Seneca-Cashco | | Oil & Gas Operator | Sep 1986 |
| 4149 | Senior Drilling & Expl Co Inc. | | Oil & Gas Operator | Apr 1993 |
| 4150 | Senior G&A Operating Co Inc | | Oil & Gas Operator | Nov 1991 |
| 4151 | Sensor Oil & Gas Inc | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 4152 | Sepulvado Oilfield Service Inc | | Oil & Gas Operator | Jul 2010 |
| 4153 | Serio Energy Corporation | | Oil & Gas Operator | Jul 2000 |
| 4154 | Serio Exploration Company | | Oil Operator | Jan 1992 |
| 4155 | Serio Oil Corp. | | Oil & Gas Operator | Sep 1991 |
| 4156 | Serio Operating Company | | Oil & Gas Operator | Mar 2007 |
| 4157 | Ses Production | | Oil & Gas Operator | Oct 2023 |
| 4158 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 4159 | Settco Oil & Gas | | Oil & Gas Operator | May 1994 |
| 4160 | Sevarg Company, Inc. | | Oil & Gas Operator | Feb 2016 |
| 4161 | Sewell Development Co Inc | | Oil & Gas Operator | Apr 1993 |
| 4162 | SG Interests, Inc. | Houston, TX 77010 | Oil & Gas Operator | Jun 2007 |
| 4163 | Shadrack Production Company | | Gas Operator | Dec 1982 |
| 4164 | Shale Energy International, LLC | | Oil & Gas Operator | Nov 2024 |
| 4165 | Shana Petroleum Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2002 |
| 4166 | Shannon Williams | | Oil Operator | Jan 1993 |
| 4167 | Shaw-Laird, LLC | | Oil & Gas Operator | Jan 2017 |
| 4168 | Shelby H. Loe, SR. Oil Co. | | Oil Operator | Jul 1989 |
| 4169 | Shelby Operating Company | Dallas, TX 75205 | Oil & Gas Operator | May 2025 |
| 4170 | Shelf Energy, LLC | | Oil & Gas Operator | Dec 2024 |
| 4171 | Shell Offshore Inc. | New Orleans, LA 70161 | Oil & Gas Operator | Jan 2008 |
| 4172 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 4173 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 4174 | Shenandoah Oil Corporation | | Oil & Gas Operator | Jun 1979 |
| 4175 | Sheridan Energy,Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 4176 | Shield Energy Resources, LLC | | Oil Operator | Dec 2024 |
| 4177 | Shiloh Creek Resources, Inc. | | Gas Operator | Nov 2024 |
| 4178 | Shocker Energy, Inc. | | Oil & Gas Operator | Oct 1992 |
| 4179 | Shoco Production, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | May 2020 |
| 4180 | Shongaloo Midstream, LLC | | Oil Operator | Mar 2019 |
| 4181 | Shore Oil Company | | Oil & Gas Operator | May 1998 |
| 4182 | Shoreline Exploration Of Texas | | Oil & Gas Operator | Oct 2000 |
| 4183 | Shoreline Exploration, Inc. | | Oil & Gas Operator | Jul 1990 |
| 4184 | Shoreline GP LLC | | Oil & Gas Operator | Jun 2012 |
| 4185 | Shoreline Offshore LLC | | Oil & Gas Operator | Jun 2017 |
| 4186 | Shoreline Petroleum Corp. | Channelview, TX 77530 | Oil & Gas Operator | Sep 2003 |
| 4187 | Shoreline Pipeline Corporation | | Oil Operator | Dec 2020 |
| 4188 | Shoreline Southeast LLC | | Oil & Gas Operator | Jun 2017 |
| 4189 | SHS Operating Company | Shreveport, LA 71149 | Oil & Gas Operator | Jan 2025 |
| 4190 | Shufflin Energy | | Oil & Gas Operator | Sep 2011 |
| 4191 | Shuler Drilling Co., Inc. | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2025 |
| 4192 | Shuteston Oil & Gas | | Oil & Gas Operator | Sep 1997 |
| 4193 | Sierra Industries, Inc. | | Oil & Gas Operator | Apr 1989 |
| 4194 | Sierra Production Company | | Oil & Gas Operator | May 1986 |
| 4195 | Sigma Energy, LLC | | Oil Operator | Jan 2025 |
| 4196 | Signal Oil And Gas Company | Colleyville, TX 76034 | Oil & Gas Operator | May 2025 |
| 4197 | Signal Operating L.L.C. | | Oil Operator | Jan 2025 |
| 4198 | Signal Petroleum | | Oil & Gas Operator | Jul 1980 |
| 4199 | Signal, LLC Of Mississippi | | Oil & Gas Operator | Dec 2024 |
| 4200 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | May 2025 |