| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | S.B. Street Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 3 | Sabre Oil And Gas Corp. | Houston, TX 77063 | Oil & Gas Operator | Feb 2026 |
| 4 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 5 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Feb 2026 |
| 6 | Salida Exploration, LLC | Abilene, TX 79603 | Oil & Gas Operator | Feb 2026 |
| 7 | Salt Creek Production, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Feb 2026 |
| 8 | San Patricio Corporation | Dinero, TX 78350 | Oil & Gas Operator | Sep 2003 |
| 9 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 10 | Santa Fe Energy Oper. Part., LP | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 11 | Sapient Energy Corp | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2002 |
| 12 | Sauder Management Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 13 | Savannah Ross And Company, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 14 | Schalk Oil Company, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 15 | Schiff, H. G. & Co. | Dallas, TX 75206 | Oil & Gas Operator | Jul 1993 |
| 16 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 17 | Shackelford Oil Co | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 18 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2025 |
| 19 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Feb 2026 |
| 20 | Simon, W. D. Oil Co. | Kermit, TX 79745 | Oil & Gas Operator | Feb 2026 |
| 21 | Sinclair Exploration Company | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 22 | SMC Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 23 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 24 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Feb 2026 |
| 25 | Southcoast Resources, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2015 |
| 26 | Southern Exploration, Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Aug 2023 |
| 27 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 28 | Southlake Exploration, Inc. | Southlake, TX 76092 | Oil & Gas Operator | Feb 2026 |
| 29 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 30 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 31 | Spence Energy Company | Dallas, TX 75360 | Oil & Gas Operator | Feb 2026 |
| 32 | Spenergy Corp. | Midland, TX 79701 | Oil & Gas Operator | Dec 1999 |
| 33 | Spiller Operating Co., Inc. | Round Rock, TX 78665 | Oil & Gas Operator | May 2015 |
| 34 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Feb 2026 |
| 35 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 36 | Staley, Jack C. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2000 |
| 37 | Stallion Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2017 |
| 38 | Stamper Operating Co., Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2026 |
| 39 | Star Production, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Feb 2026 |
| 40 | Stasney Well Service, LLC | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 41 | Stearns Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 1993 |
| 42 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 43 | Stovall Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 44 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Feb 2026 |
| 45 | Sullivan, Hollis R. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2009 |
| 46 | Sulphur River Exploration, Inc. | Dallas, TX 75244 | Oil & Gas Operator | Feb 2026 |
| 47 | Summit Resources MGMT., LLC. | Edmond, OK 73083 | Oil & Gas Operator | Feb 2026 |
| 48 | Sunlight Exploration, Inc. | Canyon, TX 79015 | Oil & Gas Operator | Feb 2026 |
| 49 | Supreme Energy Company, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Feb 2026 |
| 50 | Swenson, Clifford E. | Henrietta, TX 76365 | Oil & Gas Operator | Feb 2026 |