| 4001 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2024 |
| 4002 | Sackett Oil Company | | Oil & Gas Operator | Sep 1995 |
| 4003 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Dec 2024 |
| 4004 | Sahara Gas & Exploration, Inc. | | Gas Operator | Mar 2002 |
| 4005 | Saline Injection Systems Co. | | Oil Operator | Jun 2024 |
| 4006 | Sally Oil Company | | Oil Operator | Sep 2016 |
| 4007 | Sam Aertker | | Oil Operator | Jul 1992 |
| 4008 | Sam Jones & Assoc Prod Div Inc | | Oil & Gas Operator | Feb 1999 |
| 4009 | Sam Myers | | Oil & Gas Operator | Nov 1988 |
| 4010 | Sam R. Brown | | Oil Operator | Mar 1987 |
| 4011 | Sam Spears, Jr. | | Oil & Gas Operator | Sep 1998 |
| 4012 | Samantha Petroleum Corp. | | Oil & Gas Operator | Apr 1987 |
| 4013 | Samedan Oil Corp. Et Al | | Oil & Gas Operator | Jan 1989 |
| 4014 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 4015 | Sammy D. Thrash | | Oil & Gas Operator | May 2012 |
| 4016 | Sammy D. Thrash, LLC | | Oil & Gas Operator | May 2019 |
| 4017 | Sample Exploration | | Oil & Gas Operator | Jul 2002 |
| 4018 | Samson Contour Energy E&P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2017 |
| 4019 | Samson Exploration LLC | Tulsa, OK 74101 | Oil & Gas Operator | Oct 2024 |
| 4020 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 4021 | Samson Kelley Operating Co., LTD. | | Oil & Gas Operator | Feb 2004 |
| 4022 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2024 |
| 4023 | Samuel Gary Jr. And Assoc., Inc. | | Oil & Gas Operator | Mar 2023 |
| 4024 | San Miguel Oil & Gas, Inc. | | Oil & Gas Operator | Jan 1993 |
| 4025 | Sananco Energy Corp | Naples, FL 33941 | Oil & Gas Operator | Jul 2013 |
| 4026 | Sanare Energy Partners, LLC | | Oil & Gas Operator | Jun 2024 |
| 4027 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 2024 |
| 4028 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 4029 | Sand Hill, LTD. | | Gas Operator | Jun 2024 |
| 4030 | Sandalwood Exploration, L.P. | Houston, TX 77056 | Oil & Gas Operator | Dec 2024 |
| 4031 | Sandefer & Andress, Inc. | | Oil & Gas Operator | Apr 1982 |
| 4032 | Sandefer Petroleum Co. | | Oil & Gas Operator | Apr 1994 |
| 4033 | Sandel Energy, Inc. | Huntsville, TX 77342 | Oil & Gas Operator | Apr 2004 |
| 4034 | Sandhill Production Inc | Shongaloo, LA 71072 | Oil & Gas Operator | Dec 2019 |
| 4035 | Sandpoint Energy Partners LLC | | Oil Operator | Jul 2024 |
| 4036 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Dec 2024 |
| 4037 | Sandridge Onshore, LLC | Houston, TX 77010 | Oil & Gas Operator | Jun 2014 |
| 4038 | Santa Fe Braun, Inc | Dallas, TX 75240-6620 | Oil & Gas Operator | Mar 1995 |
| 4039 | Santa Fe Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 4040 | Santa Fe Energy Operg Parts LP | | Oil & Gas Operator | Nov 1993 |
| 4041 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 4042 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 4043 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 4044 | Santa Fe-Andover Oil Co | Tulsa, OK 74172 | Oil & Gas Operator | Sep 2000 |
| 4045 | Santana Exploration, Inc. | | Oil & Gas Operator | Dec 1985 |
| 4046 | Sante Fe Minerals | | Oil & Gas Operator | Dec 1987 |
| 4047 | Santo Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 4048 | Santos USA Corp. | Houston, TX 77042 | Oil & Gas Operator | Dec 2008 |
| 4049 | Sapient Energy Corp | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2002 |
| 4050 | Sasha Petroleum, Inc | | Oil Operator | Jan 1986 |
| 4051 | Savant Energy Corporation | | Oil & Gas Operator | Mar 2012 |
| 4052 | Sawyer Drilling & Service Inc. | | Oil & Gas Operator | Oct 2004 |
| 4053 | Sawyer Energy, Inc. | | Oil & Gas Operator | May 1997 |
| 4054 | Saxon Oil & Gas Expl., Inc. | | Gas Operator | Nov 1989 |
| 4055 | Saxon Oil Company | Dallas, TX 75204 | Oil & Gas Operator | Oct 2009 |
| 4056 | Saye Petroleum, Inc. | | Oil & Gas Operator | Apr 1995 |
| 4057 | Sayes Drilling Inc. | | Oil Operator | May 1987 |
| 4058 | SBM Operating Company Inc. | | Gas Operator | Sep 1997 |
| 4059 | Scana Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 4060 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 4061 | Sceptre Resources Inc | | Oil & Gas Operator | Dec 2007 |
| 4062 | Schmid Properties Inc | Hico, TX 76457 | Oil & Gas Operator | Dec 2024 |
| 4063 | Scogin Exploration Inc | | Oil & Gas Operator | Dec 1999 |
| 4064 | Scorpion Oil & Gas, LLC | Houston, TX 77036 | Oil & Gas Operator | Aug 2024 |
| 4065 | Scott W. Brumley | | Oil Operator | Apr 2011 |
| 4066 | Scurlock Oil Co | Houston, TX 77210 | Oil Operator | May 1997 |
| 4067 | SDG Services LLC | Kilgore, TX 75663 | Oil Operator | Dec 2024 |
| 4068 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 4069 | Seaboard Pipe & Equip. Co. | | Oil & Gas Operator | May 1977 |
| 4070 | Seaboard Well Service, Inc. | | Oil & Gas Operator | Jan 1978 |
| 4071 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 4072 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 4073 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2024 |
| 4074 | Seahawk Oil & Gas Company | Dallas, TX 75379 | Oil & Gas Operator | Aug 2007 |
| 4075 | Seal Energy Company | | Oil Operator | Jun 2024 |
| 4076 | Sealexco | | Oil & Gas Operator | Jun 1992 |
| 4077 | Sealexco-Crescent Drilling | | Oil & Gas Operator | May 1986 |
| 4078 | Seawide Limited | | Oil & Gas Operator | Jul 1983 |
| 4079 | Secan Oil Co., Inc. | | Oil & Gas Operator | May 1987 |
| 4080 | Secan Oil Co., Inc.-Pennington | | Oil & Gas Operator | May 1987 |
| 4081 | Secondary Recovery, Inc. | | Oil & Gas Operator | Dec 1991 |
| 4082 | Sedona Oil & Gas Corporation | Austin, TX 78746 | Oil & Gas Operator | Dec 2024 |
| 4083 | Segars Operating | | Gas Operator | Apr 2014 |
| 4084 | Sei Operating, LLC | Mandeville, LA 70471 | Oil & Gas Operator | Dec 2024 |
| 4085 | Semo, Inc. | | Oil & Gas Operator | Feb 2002 |
| 4086 | Sendero Energy Inc. | Dallas, TX 75205 | Oil & Gas Operator | Dec 2024 |
| 4087 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 4088 | Seneca-Cashco | | Oil & Gas Operator | Sep 1986 |
| 4089 | Senior Drilling & Expl Co Inc. | | Oil & Gas Operator | Apr 1993 |
| 4090 | Senior G&A Operating Co Inc | | Oil & Gas Operator | Nov 1991 |
| 4091 | Sensor Oil & Gas Inc | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 4092 | Sepulvado Oilfield Service Inc | | Oil & Gas Operator | Jul 2010 |
| 4093 | Serio Energy Corporation | | Oil & Gas Operator | Jul 2000 |
| 4094 | Serio Exploration Company | | Oil Operator | Jan 1992 |
| 4095 | Serio Oil Corp. | | Oil & Gas Operator | Sep 1991 |
| 4096 | Serio Operating Company | | Oil & Gas Operator | Mar 2007 |
| 4097 | Ses Production | | Oil & Gas Operator | Oct 2023 |
| 4098 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 4099 | Settco Oil & Gas | | Oil & Gas Operator | May 1994 |
| 4100 | Sevarg Company, Inc. | | Oil & Gas Operator | Feb 2016 |