| 1 | S & H Resources | Abilene, TX 79605 | Oil & Gas Operator | Mar 2025 |
| 2 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 3 | S & V Operating | Zephyr, TX 76890 | Oil & Gas Operator | Mar 2025 |
| 4 | S.B. Street Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 5 | Sabre Oil And Gas Corp. | Houston, TX 77063 | Oil & Gas Operator | Mar 2025 |
| 6 | Saga Petroleum Corp. | Midland, TX 79701 | Oil & Gas Operator | Mar 2008 |
| 7 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 8 | San Angelo Cetco, Inc. | San Angelo, TX 76901 | Oil & Gas Operator | Mar 1998 |
| 9 | Satanta Oil Company | Midland, TX 79704 | Oil & Gas Operator | Mar 2025 |
| 10 | Schlachter Operating Corporation | Dallas, TX 75225 | Oil & Gas Operator | Mar 2025 |
| 11 | Schmid Properties Inc | Hico, TX 76457 | Oil & Gas Operator | Mar 2025 |
| 12 | Scope Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2009 |
| 13 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 14 | SD Royale Energy, Inc. | San Diego, CA 92159 | Oil & Gas Operator | Mar 2025 |
| 15 | SDB Oil & Gas, LLC | Pasadena, TX 77502 | Oil Operator | Mar 2025 |
| 16 | Sedona Oil & Gas Corporation | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 17 | Sellers Lease Service, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | Mar 2025 |
| 18 | Sequoia Fossil Fuels, Inc. | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 19 | Seven Cross Operating, LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2025 |
| 20 | Sha-Jam Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 21 | Shamrock Minerals Corporation | Merkel, TX 79536 | Oil & Gas Operator | Nov 1998 |
| 22 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Mar 2025 |
| 23 | Shelby, Michael H. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2025 |
| 24 | Shenandoah Oil, Inc. (I) | Midland, TX 79710 | Oil & Gas Operator | Apr 1996 |
| 25 | Shifflett Operating Company | Snyder, TX 79550 | Oil & Gas Operator | Mar 2025 |
| 26 | Shoco Production LLC | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 27 | Shoco Production, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | May 2020 |
| 28 | Shoshone Oil Company | Dallas, TX 75244 | Oil & Gas Operator | May 1994 |
| 29 | Simpson Oil & Land Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 30 | Simpson Operating Services, LP | Ballinger, TX 76821 | Oil & Gas Operator | Mar 2025 |
| 31 | Sims, John S. | Lawn, TX 79530 | Oil & Gas Operator | Aug 2003 |
| 32 | Six Oil Producers | Abilene, TX 79601 | Oil & Gas Operator | Sep 2002 |
| 33 | Smail, James R. | Big Prairie, OH 44611 | Oil & Gas Operator | Dec 1998 |
| 34 | Smalley, Bill | Albany, TX 76430 | Oil & Gas Operator | Jul 2001 |
| 35 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 36 | Snow Oil & Gas Inc. | Andrews, TX 79714 | Oil & Gas Operator | Mar 2025 |
| 37 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 38 | Southcoast Resources, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2015 |
| 39 | Southeastern Resources Corp. | Mansfield, TX 76063 | Oil & Gas Operator | Feb 2004 |
| 40 | Southern Exploration, Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Aug 2023 |
| 41 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 42 | Southwest Gas Systems, Inc. | Spring, TX 77379 | Oil & Gas Operator | Mar 2025 |
| 43 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 44 | Sovereign Petroleum Company, LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jul 2013 |
| 45 | Spence Energy Company | Dallas, TX 75206 | Oil & Gas Operator | Mar 2025 |
| 46 | SPH Development, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Nov 2022 |
| 47 | Spicer Oil Company, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2008 |
| 48 | Sproul, C. R. Inc. | Eldorado, TX 76936 | Oil & Gas Operator | Aug 2000 |
| 49 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 50 | St. Mary Energy Company | Houston, TX 77079 | Oil & Gas Operator | Aug 2008 |
| 51 | Standard Oil Tools, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Mar 2025 |
| 52 | Star Production, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Mar 2025 |
| 53 | Stearns Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 1993 |
| 54 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 55 | Stetson Petroleum Corp. | Rollins, MT 59931 | Oil & Gas Operator | Mar 2025 |
| 56 | Stovall Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 57 | Street, Spencer B., Jr. | Graham, TX 76450 | Oil & Gas Operator | Mar 1998 |
| 58 | Stroube Energy Corporation | Dallas, TX 75248 | Oil & Gas Operator | Jan 2012 |
| 59 | Stubblefield Energy Company | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 60 | Subsurface Energy Corp. | Coleman, TX 76834 | Oil & Gas Operator | Mar 2025 |
| 61 | Subsurface Exploration | Coleman, TX 76834 | Oil & Gas Operator | Apr 2006 |
| 62 | Subsurface Production, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Mar 2025 |
| 63 | Susanna Corporation | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 64 | Swartz Oil Company | San Angelo, TX 76906 | Oil & Gas Operator | Mar 2025 |
| 65 | Sweetwater Drilling Co., Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2025 |
| 66 | Sweetwater Production, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Mar 2025 |
| 67 | Synergy Oil & Gas, Inc. (A) | Houston, TX 77024 | Oil & Gas Operator | Aug 2001 |
| 68 | Synergy Production Company | Houston, TX 77024 | Oil & Gas Operator | Jan 1996 |