| 4101 | Ses Production | | Oil & Gas Operator | Oct 2023 |
| 4102 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 4103 | Settco Oil & Gas | | Oil & Gas Operator | May 1994 |
| 4104 | Sevarg Company, Inc. | | Oil & Gas Operator | Feb 2016 |
| 4105 | SG Interests, Inc. | Houston, TX 77010 | Oil & Gas Operator | Jun 2007 |
| 4106 | Shadrack Production Company | | Gas Operator | Dec 1982 |
| 4107 | Shale Energy International, LLC | | Oil & Gas Operator | Nov 2024 |
| 4108 | Shana Petroleum Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2002 |
| 4109 | Shannon Williams | | Oil Operator | Jan 1993 |
| 4110 | Shaw-Laird, LLC | | Oil & Gas Operator | Jan 2017 |
| 4111 | Shelby H. Loe, SR. Oil Co. | | Oil Operator | Jul 1989 |
| 4112 | Shelby Operating Company | Dallas, TX 75205 | Oil & Gas Operator | Sep 2026 |
| 4113 | Shelf Energy, LLC | | Oil & Gas Operator | Dec 2024 |
| 4114 | Shell Offshore Inc. | New Orleans, LA 70161 | Oil & Gas Operator | Jan 2008 |
| 4115 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 4116 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 4117 | Shenandoah Oil Corporation | | Oil & Gas Operator | Jun 1979 |
| 4118 | Sheridan Energy,Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 4119 | Shield Energy Resources, LLC | | Oil Operator | Dec 2024 |
| 4120 | Shiloh Creek Resources, Inc. | | Gas Operator | Nov 2024 |
| 4121 | Shocker Energy, Inc. | | Oil & Gas Operator | Oct 1992 |
| 4122 | Shoco Production, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | May 2020 |
| 4123 | Shongaloo Midstream, LLC | | Oil Operator | Mar 2019 |
| 4124 | Shore Oil Company | | Oil & Gas Operator | May 1998 |
| 4125 | Shoreline Exploration Of Texas | | Oil & Gas Operator | Oct 2000 |
| 4126 | Shoreline Exploration, Inc. | | Oil & Gas Operator | Jul 1990 |
| 4127 | Shoreline GP LLC | | Oil & Gas Operator | Jun 2012 |
| 4128 | Shoreline Offshore LLC | | Oil & Gas Operator | Jun 2017 |
| 4129 | Shoreline Petroleum Corp. | Channelview, TX 77530 | Oil & Gas Operator | Sep 2003 |
| 4130 | Shoreline Pipeline Corporation | | Oil Operator | Dec 2020 |
| 4131 | Shoreline Southeast LLC | | Oil & Gas Operator | Jun 2017 |
| 4132 | SHS Operating Company | Shreveport, LA 71149 | Oil & Gas Operator | Jan 2025 |
| 4133 | Shufflin Energy | | Oil & Gas Operator | Sep 2011 |
| 4134 | Shuler Drilling Co., Inc. | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2025 |
| 4135 | Shuteston Oil & Gas | | Oil & Gas Operator | Sep 1997 |
| 4136 | Sierra Industries, Inc. | | Oil & Gas Operator | Apr 1989 |
| 4137 | Sierra Production Company | | Oil & Gas Operator | May 1986 |
| 4138 | Sigma Energy, LLC | | Oil Operator | Jan 2025 |
| 4139 | Signal Oil And Gas Company | Colleyville, TX 76034 | Oil & Gas Operator | Sep 2026 |
| 4140 | Signal Operating L.L.C. | | Oil Operator | Jan 2025 |
| 4141 | Signal Petroleum | | Oil & Gas Operator | Jul 1980 |
| 4142 | Signal, LLC Of Mississippi | | Oil & Gas Operator | Dec 2024 |
| 4143 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Sep 2026 |
| 4144 | Silver Hill Energy Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Sep 2026 |
| 4145 | Silver Oak Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2016 |
| 4146 | Silver Oak Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Dec 2009 |
| 4147 | Silver Oak Operating, LLC | Longview, TX 75604 | Oil & Gas Operator | Sep 2026 |
| 4148 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Jun 2026 |
| 4149 | Simar Petroleum, LLC | | Oil Operator | Dec 2024 |
| 4150 | Simco Oil Company | | Oil Operator | Jul 1990 |
| 4151 | Simmons Oil Corp | | Oil Operator | Jan 1989 |
| 4152 | Simpson Well Service, Inc. | | Oil Operator | Dec 1996 |
| 4153 | Singer-Fleischaker Oil Co Inc | | Oil & Gas Operator | Jul 1987 |
| 4154 | Singer-Fleischaker Oil Op Co | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2002 |
| 4155 | Singer-Fleischaker,Dillon | | Oil & Gas Operator | Aug 1979 |
| 4156 | Single Barrel Oil And Gas LLC | Granbury, TX 76048 | Oil & Gas Operator | Sep 2026 |
| 4157 | Sitwell, Inc. | | Oil Operator | May 2022 |
| 4158 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 4159 | Skinner Energy Management, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Jan 2011 |
| 4160 | Sklar & Phillips - Harry Hurt | | Oil & Gas Operator | Jul 1986 |
| 4161 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 4162 | Sklar & Phillips Oil Co.-Entex | | Oil & Gas Operator | Aug 1978 |
| 4163 | Sklar &Phillips-Great Southern | | Oil & Gas Operator | Aug 1980 |
| 4164 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2026 |
| 4165 | Skrivanos Engineering, Inc. | Shreveport, LA 71164 | Oil & Gas Operator | Dec 2011 |
| 4166 | Skyhawk Energy, LLC | | Oil Operator | Dec 2024 |
| 4167 | Skyline Oil Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Jan 1987 |
| 4168 | SKZ Inc. | | Oil Operator | Mar 1988 |
| 4169 | Slam Resources, Inc. | | Oil & Gas Operator | Apr 1994 |
| 4170 | Slapco - Emerald Exploration | | Gas Operator | Sep 1979 |
| 4171 | Sleeth And Brooks Oil Co. | | Oil Operator | Jul 1989 |
| 4172 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Sep 2026 |
| 4173 | Smackover Drilling Co. Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jan 2025 |
| 4174 | Smal Energy Corp | Tyler, TX 75710 | Oil & Gas Operator | Oct 1995 |
| 4175 | SMC Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2026 |
| 4176 | Smith Oil And Gas Co | Wichita Falls, TX 76310 | Oil Operator | Dec 2010 |
| 4177 | Smith Operating And MGMT Co. | Shreveport, LA 71161 | Oil & Gas Operator | Jun 2023 |
| 4178 | Smith Operating-Germany Oil | | Oil & Gas Operator | Dec 1995 |
| 4179 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Sep 2026 |
| 4180 | Smith Production Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2026 |
| 4181 | Smith-Wentworth | | Oil & Gas Operator | Sep 1983 |
| 4182 | Smith-Wentworth & Coquina | | Oil Operator | Jun 1983 |
| 4183 | Smith-Wentworth & Hughes & New | | Oil Operator | Jun 1983 |
| 4184 | SMK-La, Inc. | | Oil & Gas Operator | Sep 1999 |
| 4185 | SMR Natural Gas Ventures Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Jan 1999 |
| 4186 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 4187 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 4188 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 4189 | Sohio Petr Co-Gulf Oil Corp | | Oil & Gas Operator | Dec 1979 |
| 4190 | Sohio Petroleum Co. | Casper, WY 82602 | Oil & Gas Operator | Apr 1986 |
| 4191 | Sohio Petroleum Co. Et Al | | Oil & Gas Operator | May 1979 |
| 4192 | Sola Oil Company, Inc. | | Oil & Gas Operator | Aug 1991 |
| 4193 | Sola Operating, LLC | Trout, LA 71371 | Oil Operator | Sep 2026 |
| 4194 | Solatex | | Oil & Gas Operator | Oct 1978 |
| 4195 | Solatex Resources, LTD | Houston, TX 77257 | Oil & Gas Operator | Sep 2026 |
| 4196 | Soldier Operating LLC | | Oil & Gas Operator | Dec 2024 |
| 4197 | Solid Rock Prod. | | Oil Operator | Nov 1994 |
| 4198 | Son-Dad Oil & Gas | | Oil & Gas Operator | Dec 1994 |
| 4199 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 4200 | Sonat Exploration Gom Inc. | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |