| 1 | S & S Operating Company, Inc. | Winnie, TX 77665 | Oil & Gas Operator | Oct 2025 |
| 2 | S2 Energy Operating LLC | | Oil & Gas Operator | May 2023 |
| 3 | Sandpoint Energy Partners LLC | | Oil Operator | Jan 2025 |
| 4 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Oct 2025 |
| 5 | Santa Fe Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 6 | Santa Fe Energy Operg Parts LP | | Oil & Gas Operator | Nov 1993 |
| 7 | Schmid Properties Inc | Hico, TX 76457 | Oil & Gas Operator | Oct 2025 |
| 8 | Seaboard Pipe & Equip. Co. | | Oil & Gas Operator | May 1977 |
| 9 | Secondary Recovery, Inc. | | Oil & Gas Operator | Dec 1991 |
| 10 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 11 | Silver Oak Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2016 |
| 12 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 13 | Smith Operating And MGMT Co. | Shreveport, LA 71161 | Oil & Gas Operator | Jun 2023 |
| 14 | Smith Production Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 15 | Sohio Petroleum Co. | Casper, WY 82602 | Oil & Gas Operator | Apr 1986 |
| 16 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 17 | Sonoran Energy Inc. | Addison, TX 75001 | Oil & Gas Operator | Oct 2025 |
| 18 | Sotrana-Texas Corp. | | Oil & Gas Operator | Oct 1984 |
| 19 | Sound Resources Corporation | | Oil & Gas Operator | Dec 2003 |
| 20 | Source Petroleum Inc. | San Antonio, TX 78265 | Oil & Gas Operator | Oct 2025 |
| 21 | South La. Production Co., Inc. | | Oil & Gas Operator | Jun 1982 |
| 22 | Southco Oil And Gas Inc. | | Oil & Gas Operator | Nov 2000 |
| 23 | Southern Wells, Inc. | | Oil Operator | Sep 2002 |
| 24 | Southwest Oil Properties, Inc. | | Oil & Gas Operator | Feb 1996 |
| 25 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 26 | Square Mile Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 27 | SRP Production Corp. | | Oil & Gas Operator | Nov 1997 |
| 28 | Sun Exploration-Production Co. | | Oil & Gas Operator | Jan 1990 |
| 29 | SV Energy Company, LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2017 |
| 30 | Swift Energy Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Jun 2017 |
| 31 | Synergy Oil & Gas, L.P. | Houston, TX 77024 | Oil & Gas Operator | May 2012 |