| 1 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Jun 2025 |
| 2 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 3 | San Dia Producing Company | Deanville, TX 77852 | Oil & Gas Operator | Jun 2025 |
| 4 | Sandel Energy, Inc. | Huntsville, TX 77342 | Oil & Gas Operator | Apr 2004 |
| 5 | Sandel Operating Company | Huntsville, TX 77340 | Oil & Gas Operator | Jun 2025 |
| 6 | Sanders, Larry E. Trustee | Longview, TX 75606 | Oil & Gas Operator | Jun 2025 |
| 7 | Sanhall Corporation | Huntsville, TX 77340 | Oil & Gas Operator | Oct 1993 |
| 8 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 9 | Santana Energy Services, LLC | Baton Rouge, LA 70809 | Oil & Gas Operator | Jun 2025 |
| 10 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 11 | Senora Resources, Inc. | Dime Box, TX 77853 | Oil & Gas Operator | Jun 2025 |
| 12 | Shield Petroleum | College Sta, TX 77845 | Oil & Gas Operator | Jun 2025 |
| 13 | Showdown Operating, Inc. | Dallas, TX 75230 | Oil & Gas Operator | May 1996 |
| 14 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Jun 2025 |
| 15 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 16 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 17 | Southwest Resources, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Jun 2025 |
| 18 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 19 | Stanton Mineral Development Inc | Austin, TX 78759 | Oil & Gas Operator | Jun 2025 |
| 20 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 21 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Jun 2025 |
| 22 | Stroud Energy, LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2006 |
| 23 | Stroud Oil Properties, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2013 |
| 24 | Summit Exploration, L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2008 |
| 25 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Jun 2025 |
| 26 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 27 | Swope Corp. | Austin, TX 78735 | Oil & Gas Operator | Jun 2025 |