| 4101 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 4102 | Sceptre Resources Inc | | Oil & Gas Operator | Dec 2007 |
| 4103 | Schmid Properties Inc | Hico, TX 76457 | Oil & Gas Operator | Sep 2025 |
| 4104 | Scogin Exploration Inc | | Oil & Gas Operator | Dec 1999 |
| 4105 | Scorpion Oil & Gas, LLC | Houston, TX 77036 | Oil & Gas Operator | May 2025 |
| 4106 | Scott W. Brumley | | Oil Operator | Apr 2011 |
| 4107 | Scurlock Oil Co | | Oil Operator | May 1982 |
| 4108 | SDG Services LLC | Kilgore, TX 75663 | Oil Operator | Sep 2025 |
| 4109 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 4110 | Seaboard Pipe & Equip. Co. | | Oil & Gas Operator | May 1977 |
| 4111 | Seaboard Well Service, Inc. | | Oil & Gas Operator | Jan 1978 |
| 4112 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 4113 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 4114 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 4115 | Seahawk Oil & Gas Company | Dallas, TX 75379 | Oil & Gas Operator | Aug 2007 |
| 4116 | Seal Energy Company | | Oil Operator | Dec 2024 |
| 4117 | Sealexco | | Oil & Gas Operator | Jun 1992 |
| 4118 | Sealexco-Crescent Drilling | | Oil & Gas Operator | May 1986 |
| 4119 | Seawide Limited | | Oil & Gas Operator | Jul 1983 |
| 4120 | Secan Oil Co., Inc. | | Oil & Gas Operator | May 1987 |
| 4121 | Secan Oil Co., Inc.-Pennington | | Oil & Gas Operator | May 1987 |
| 4122 | Secondary Recovery, Inc. | | Oil & Gas Operator | Dec 1991 |
| 4123 | Sedona Oil & Gas Corporation | Austin, TX 78746 | Oil & Gas Operator | Sep 2025 |
| 4124 | Segars Operating | | Gas Operator | Apr 2014 |
| 4125 | Sei Operating, LLC | Mandeville, LA 70471 | Oil & Gas Operator | Sep 2025 |
| 4126 | Semo, Inc. | | Oil & Gas Operator | Feb 2002 |
| 4127 | Sendero Energy Inc. | Dallas, TX 75205 | Oil & Gas Operator | Sep 2025 |
| 4128 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 4129 | Seneca-Cashco | | Oil & Gas Operator | Sep 1986 |
| 4130 | Senior Drilling & Expl Co Inc. | | Oil & Gas Operator | Apr 1993 |
| 4131 | Senior G&A Operating Co Inc | | Oil & Gas Operator | Nov 1991 |
| 4132 | Sensor Oil & Gas Inc | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 4133 | Sepulvado Oilfield Service Inc | | Oil & Gas Operator | Jul 2010 |
| 4134 | Serio Energy Corporation | | Oil & Gas Operator | Jul 2000 |
| 4135 | Serio Exploration Company | | Oil Operator | Jan 1992 |
| 4136 | Serio Oil Corp. | | Oil & Gas Operator | Sep 1991 |
| 4137 | Serio Operating Company | | Oil & Gas Operator | Mar 2007 |
| 4138 | Ses Production | | Oil & Gas Operator | Oct 2023 |
| 4139 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 4140 | Settco Oil & Gas | | Oil & Gas Operator | May 1994 |
| 4141 | Sevarg Company, Inc. | | Oil & Gas Operator | Feb 2016 |
| 4142 | Sewell Development Co Inc | | Oil & Gas Operator | Apr 1993 |
| 4143 | SG Interests, Inc. | Houston, TX 77010 | Oil & Gas Operator | Jun 2007 |
| 4144 | Shadrack Production Company | | Gas Operator | Dec 1982 |
| 4145 | Shale Energy International, LLC | | Oil & Gas Operator | Nov 2024 |
| 4146 | Shana Petroleum Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2002 |
| 4147 | Shannon Williams | | Oil Operator | Jan 1993 |
| 4148 | Shaw-Laird, LLC | | Oil & Gas Operator | Jan 2017 |
| 4149 | Shelby H. Loe, SR. Oil Co. | | Oil Operator | Jul 1989 |
| 4150 | Shelby Operating Company | Dallas, TX 75205 | Oil & Gas Operator | Sep 2025 |
| 4151 | Shelf Energy, LLC | | Oil & Gas Operator | Dec 2024 |
| 4152 | Shell Offshore Inc. | New Orleans, LA 70161 | Oil & Gas Operator | Jan 2008 |
| 4153 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 4154 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 4155 | Shenandoah Oil Corporation | | Oil & Gas Operator | Jun 1979 |
| 4156 | Sheridan Energy,Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 4157 | Shield Energy Resources, LLC | | Oil Operator | Dec 2024 |
| 4158 | Shiloh Creek Resources, Inc. | | Gas Operator | Nov 2024 |
| 4159 | Shocker Energy, Inc. | | Oil & Gas Operator | Oct 1992 |
| 4160 | Shoco Production, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | May 2020 |
| 4161 | Shongaloo Midstream, LLC | | Oil Operator | Mar 2019 |
| 4162 | Shore Oil Company | | Oil & Gas Operator | May 1998 |
| 4163 | Shoreline Exploration Of Texas | | Oil & Gas Operator | Oct 2000 |
| 4164 | Shoreline Exploration, Inc. | | Oil & Gas Operator | Jul 1990 |
| 4165 | Shoreline GP LLC | | Oil & Gas Operator | Jun 2012 |
| 4166 | Shoreline Offshore LLC | | Oil & Gas Operator | Jun 2017 |
| 4167 | Shoreline Petroleum Corp. | Channelview, TX 77530 | Oil & Gas Operator | Sep 2003 |
| 4168 | Shoreline Pipeline Corporation | | Oil Operator | Dec 2020 |
| 4169 | Shoreline Southeast LLC | | Oil & Gas Operator | Jun 2017 |
| 4170 | SHS Operating Company | Shreveport, LA 71149 | Oil & Gas Operator | Jan 2025 |
| 4171 | Shufflin Energy | | Oil & Gas Operator | Sep 2011 |
| 4172 | Shuler Drilling Co., Inc. | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2025 |
| 4173 | Shuteston Oil & Gas | | Oil & Gas Operator | Sep 1997 |
| 4174 | Sierra Industries, Inc. | | Oil & Gas Operator | Apr 1989 |
| 4175 | Sierra Production Company | | Oil & Gas Operator | May 1986 |
| 4176 | Sigma Energy, LLC | | Oil Operator | Jan 2025 |
| 4177 | Signal Oil And Gas Company | Colleyville, TX 76034 | Oil & Gas Operator | Sep 2025 |
| 4178 | Signal Operating L.L.C. | | Oil Operator | Jan 2025 |
| 4179 | Signal Petroleum | | Oil & Gas Operator | Jul 1980 |
| 4180 | Signal, LLC Of Mississippi | | Oil & Gas Operator | Dec 2024 |
| 4181 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Sep 2025 |
| 4182 | Silver Hill Energy Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Sep 2025 |
| 4183 | Silver Oak Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2016 |
| 4184 | Silver Oak Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Dec 2009 |
| 4185 | Silver Oak Operating, LLC | Longview, TX 75604 | Oil & Gas Operator | Sep 2025 |
| 4186 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | May 2025 |
| 4187 | Simar Petroleum, LLC | | Oil Operator | Dec 2024 |
| 4188 | Simco Oil Company | | Oil Operator | Jul 1990 |
| 4189 | Simmons Oil Corporation | | Oil Operator | Jan 1989 |
| 4190 | Simpson Well Service, Inc. | | Oil Operator | Dec 1996 |
| 4191 | Singer Fleischaker Oil Op. Co. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2002 |
| 4192 | Singer-Fleischaker Oil Co Inc | | Oil & Gas Operator | Jul 1987 |
| 4193 | Singer-Fleischaker,Dillon | | Oil & Gas Operator | Aug 1979 |
| 4194 | Single Barrel Oil And Gas LLC | Granbury, TX 76048 | Oil & Gas Operator | Sep 2025 |
| 4195 | Sitwell, Inc. | | Oil Operator | May 2022 |
| 4196 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 4197 | Skinner Energy Management, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Jan 2011 |
| 4198 | Sklar & Phillips - Harry Hurt | | Oil & Gas Operator | Jul 1986 |
| 4199 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 4200 | Sklar & Phillips Oil Co.-Entex | | Oil & Gas Operator | Aug 1978 |