| 4001 | Scurlock Oil Co | Houston, TX 77210 | Oil Operator | May 1997 |
| 4002 | SDG Services LLC | Kilgore, TX 75663 | Oil Operator | Apr 2024 |
| 4003 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 4004 | Seaboard Pipe & Equip. Co. | | Oil & Gas Operator | May 1977 |
| 4005 | Seaboard Well Service, Inc. | | Oil & Gas Operator | Jan 1978 |
| 4006 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 4007 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 4008 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2024 |
| 4009 | Seahawk Oil & Gas Company | Dallas, TX 75379 | Oil & Gas Operator | Aug 2007 |
| 4010 | Seal Energy Company | | Oil Operator | Dec 2023 |
| 4011 | Sealexco | | Oil & Gas Operator | Jun 1992 |
| 4012 | Sealexco-Crescent Drilling | | Oil & Gas Operator | May 1986 |
| 4013 | Seawide Limited | | Oil & Gas Operator | Jul 1983 |
| 4014 | Secan Oil Co., Inc. | | Oil & Gas Operator | May 1987 |
| 4015 | Secan Oil Co., Inc.-Pennington | | Oil & Gas Operator | May 1987 |
| 4016 | Secondary Recovery, Inc. | | Oil & Gas Operator | Dec 1991 |
| 4017 | Sedona Oil & Gas Corporation | Austin, TX 78746 | Oil & Gas Operator | Apr 2024 |
| 4018 | Segars Operating | | Gas Operator | Apr 2014 |
| 4019 | Sei Operating, LLC | Mandeville, LA 70471 | Oil & Gas Operator | Apr 2024 |
| 4020 | Semo, Inc. | | Oil & Gas Operator | Feb 2002 |
| 4021 | Sendero Energy Inc. | Dallas, TX 75205 | Oil & Gas Operator | Apr 2024 |
| 4022 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 4023 | Seneca-Cashco | | Oil & Gas Operator | Sep 1986 |
| 4024 | Senior Drilling & Expl Co Inc. | | Oil & Gas Operator | Apr 1993 |
| 4025 | Senior G&A Operating Co Inc | | Oil & Gas Operator | Nov 1991 |
| 4026 | Sensor Oil & Gas Inc | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 4027 | Sepulvado Oilfield Service Inc | | Oil & Gas Operator | Jul 2010 |
| 4028 | Serio Energy Corporation | | Oil & Gas Operator | Jul 2000 |
| 4029 | Serio Exploration Company | | Oil Operator | Jan 1992 |
| 4030 | Serio Oil Corp. | | Oil & Gas Operator | Sep 1991 |
| 4031 | Serio Operating Company | | Oil & Gas Operator | Mar 2007 |
| 4032 | Ses Production | | Oil & Gas Operator | Oct 2023 |
| 4033 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 4034 | Settco Oil & Gas | | Oil & Gas Operator | May 1994 |
| 4035 | Sevarg Company, Inc. | | Oil & Gas Operator | Feb 2016 |
| 4036 | SG Interests, Inc. | Houston, TX 77010 | Oil & Gas Operator | Jun 2007 |
| 4037 | Shale Energy International, LLC | | Oil & Gas Operator | Nov 2023 |
| 4038 | Shana Petroleum Company | Dallas, TX 75206 | Oil & Gas Operator | Sep 2002 |
| 4039 | Shannon Williams | | Oil Operator | Jan 1993 |
| 4040 | Shaw-Laird, LLC | | Oil & Gas Operator | Jan 2017 |
| 4041 | Shelby H. Loe, SR. Oil Co. | | Oil Operator | Jul 1989 |
| 4042 | Shelby Operating Company | Dallas, TX 75205 | Oil & Gas Operator | Apr 2024 |
| 4043 | Shelf Energy, LLC | | Oil & Gas Operator | Dec 2023 |
| 4044 | Shell Offshore Inc. | New Orleans, LA 70161 | Oil & Gas Operator | Jan 2008 |
| 4045 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 4046 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 4047 | Shenandoah Oil Corporation | | Oil & Gas Operator | Jun 1979 |
| 4048 | Sheridan Energy,Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 4049 | Shield Energy Resources, LLC | | Oil Operator | Dec 2023 |
| 4050 | Shiloh Creek Resources, Inc. | | Gas Operator | Dec 2023 |
| 4051 | Shocker Energy, Inc. | | Oil & Gas Operator | Oct 1992 |
| 4052 | Shoco Production, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | May 2020 |
| 4053 | Shongaloo Midstream, LLC | | Oil Operator | Mar 2019 |
| 4054 | Shore Oil Company | | Oil & Gas Operator | May 1998 |
| 4055 | Shoreline Exploration Of Texas | | Oil & Gas Operator | Oct 2000 |
| 4056 | Shoreline Exploration, Inc. | | Oil & Gas Operator | Jul 1990 |
| 4057 | Shoreline GP LLC | | Oil & Gas Operator | Jun 2012 |
| 4058 | Shoreline Offshore LLC | | Oil & Gas Operator | Jun 2017 |
| 4059 | Shoreline Petroleum Corp. | Channelview, TX 77530 | Oil & Gas Operator | Sep 2003 |
| 4060 | Shoreline Pipeline Corporation | | Oil Operator | Dec 2020 |
| 4061 | Shoreline Southeast LLC | Lafayette, LA 70508 | Oil & Gas Operator | Jun 2017 |
| 4062 | SHS Operating Company | Shreveport, LA 71149 | Oil & Gas Operator | Dec 2023 |
| 4063 | Shufflin Energy | | Oil & Gas Operator | Sep 2011 |
| 4064 | Shuler Drilling Co., Inc. | El Dorado, AR 71730 | Oil & Gas Operator | Feb 2024 |
| 4065 | Shuteston Oil & Gas | | Oil & Gas Operator | Sep 1997 |
| 4066 | Sierra Industries, Inc. | | Oil & Gas Operator | Apr 1989 |
| 4067 | Sierra Production Company | | Oil & Gas Operator | May 1986 |
| 4068 | Sigma Energy, LLC | | Oil Operator | Jan 2024 |
| 4069 | Signal Oil And Gas Company | Colleyville, TX 76034 | Oil & Gas Operator | Apr 2024 |
| 4070 | Signal Petroleum | | Oil & Gas Operator | Jul 1980 |
| 4071 | Signal, LLC Of Mississippi | | Oil & Gas Operator | Dec 2023 |
| 4072 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Apr 2024 |
| 4073 | Silver Hill Energy Operating LLC | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 4074 | Silver Oak Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2016 |
| 4075 | Silver Oak Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Dec 2009 |
| 4076 | Silver Oak Operating, LLC | Longview, TX 75604 | Oil & Gas Operator | Apr 2024 |
| 4077 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Dec 2023 |
| 4078 | Simar Petroleum, LLC | | Oil Operator | Nov 2023 |
| 4079 | Simco Oil Company | | Oil Operator | Jul 1990 |
| 4080 | Simmons Oil Corporation | | Oil Operator | Jan 1989 |
| 4081 | Simpson Well Service, Inc. | | Oil Operator | Dec 1996 |
| 4082 | Singer Fleischaker Oil Op. Co. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2002 |
| 4083 | Singer-Fleischaker Oil Co Inc | | Oil & Gas Operator | Jul 1987 |
| 4084 | Singer-Fleischaker,Dillon | | Oil & Gas Operator | Aug 1979 |
| 4085 | Single Barrel Oil And Gas LLC | Granbury, TX 76048 | Oil & Gas Operator | Apr 2024 |
| 4086 | Sitwell, Inc. | | Oil Operator | May 2022 |
| 4087 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 4088 | Skinner Energy Management, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Jan 2011 |
| 4089 | Sklar & Phillips - Harry Hurt | | Oil & Gas Operator | Jul 1986 |
| 4090 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 4091 | Sklar & Phillips Oil Co.-Entex | | Oil & Gas Operator | Aug 1978 |
| 4092 | Sklar &Phillips-Great Southern | | Oil & Gas Operator | Aug 1980 |
| 4093 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2024 |
| 4094 | Skrivanos Engineering, Inc. | Shreveport, LA 71164 | Oil & Gas Operator | Dec 2011 |
| 4095 | Skyhawk Energy, LLC | | Oil Operator | Dec 2023 |
| 4096 | Skyline Oil Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Jan 1987 |
| 4097 | SKZ Inc. | | Oil Operator | Mar 1988 |
| 4098 | Slam Resources, Inc. | | Oil & Gas Operator | Apr 1994 |
| 4099 | Slapco - Emerald Exploration | | Gas Operator | Sep 1979 |
| 4100 | Sleeth And Brooks Oil Co. | | Oil Operator | Jul 1989 |