| 1 | S & M Drilling, LLC | Wichita Falls, TX 76308 | Oil Operator | Sep 2023 |
| 2 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 3 | San Angelo Cetco, Inc. | San Angelo, TX 76901 | Oil & Gas Operator | Mar 1998 |
| 4 | Sandstone Operating Company, Inc | Odessa, TX 79762 | Oil & Gas Operator | Jul 1995 |
| 5 | Santa Fe Energy Oper. Part., LP | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 6 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 7 | Schkade & Bullock | San Angelo, TX 76901 | Oil & Gas Operator | Aug 2003 |
| 8 | Schkade Exploration | San Angelo, TX 76901 | Oil & Gas Operator | Oct 2025 |
| 9 | Scope Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2003 |
| 10 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 11 | SDG Resources L.P. | Montrose, CO 81402 | Oil & Gas Operator | May 2006 |
| 12 | Seven Wells Oil & Gas Expl. | Abilene, TX 79601 | Oil & Gas Operator | Jun 2014 |
| 13 | Sha-Jam Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 14 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Oct 2025 |
| 15 | Siana Oil & Gas | Conroe, TX 77305 | Oil & Gas Operator | Oct 2025 |
| 16 | Silver Oil & Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Oct 2025 |
| 17 | Sinclair Exploration Company | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 18 | Sixess Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 19 | SMC Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 20 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 21 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 22 | Sonoran Energy Inc. | Addison, TX 75001 | Oil & Gas Operator | Oct 2025 |
| 23 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 24 | Southwest Petroleum | San Antonio, TX 78253 | Oil & Gas Operator | Oct 2025 |
| 25 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 26 | Sproul, C. R. Inc. | Eldorado, TX 76936 | Oil & Gas Operator | Aug 2000 |
| 27 | SS Operating LLC | Water Valley, TX 76958 | Oil Operator | Oct 2025 |
| 28 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 29 | Staley Operating Co. | Midland, TX 79702 | Oil & Gas Operator | Jan 2022 |
| 30 | Star Production, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Oct 2025 |
| 31 | Stevens & Tull, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2000 |
| 32 | Strand Energy, Inc. (I) | Houston, TX 77002 | Oil & Gas Operator | Sep 1996 |
| 33 | Stringer Oil & Gas Co., Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Oct 1996 |
| 34 | Subsurface Energy Corp. | Coleman, TX 76834 | Oil & Gas Operator | Oct 2025 |
| 35 | Sun River Operating, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2025 |
| 36 | Sunburst, Inc. | Wheat Ridge, CO 80033 | Oil & Gas Operator | Jul 2025 |
| 37 | Surge Solutions, Inc. | Bandera, TX 78003 | Oil Operator | Oct 2025 |
| 38 | Swartz Oil Company | San Angelo, TX 76906 | Oil & Gas Operator | Oct 2025 |
| 39 | Swartz, Guy A. | San Angelo, TX 76904 | Oil & Gas Operator | Aug 1993 |
| 40 | Sweetwater Drilling Co., Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Oct 2025 |
| 41 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |