| 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 | Oct 2025 |
| 3 | Sabre Oil And Gas Corp. | Houston, TX 77063 | Oil & Gas Operator | Oct 2025 |
| 4 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 5 | Safari Resources, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 6 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 7 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 8 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 9 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 10 | SBS Oil Company | Austin, TX 78749 | Oil & Gas Operator | Oct 2025 |
| 11 | Schiff, H. G. & Co. | Dallas, TX 75206 | Oil & Gas Operator | Jul 1993 |
| 12 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 13 | Scully And Smith Oil Corporation | Salado, TX 76571 | Oil & Gas Operator | Feb 1995 |
| 14 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 15 | Seely Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 16 | Senkel, Wesley, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2007 |
| 17 | Sequoia Fossil Fuels, Inc. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 18 | Sequoia Natural Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 19 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Oct 2025 |
| 20 | Sheets Exploration Co., Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2016 |
| 21 | Shiloh Oil Company LLC | Williston, FL 32696 | Oil & Gas Operator | Oct 2025 |
| 22 | Shoshone Oil Company | Dallas, TX 75244 | Oil & Gas Operator | May 1994 |
| 23 | Simpson Oil & Land Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 24 | Singleton Investments, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2012 |
| 25 | Sky Development Corporation | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 26 | Sky Resources, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 27 | Skyway Energy LLC | Leesburg, OH 34748 | Oil & Gas Operator | Dec 2020 |
| 28 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 29 | Smith, W. Don | Breckenridge, TX 76424 | Oil & Gas Operator | Aug 2001 |
| 30 | Snow Oil Company | Nocona, TX 76255 | Oil Operator | Oct 2025 |
| 31 | Snyder Drilling Corp. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 32 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 33 | So Operating Company | Cisco, TX 76437 | Oil & Gas Operator | Oct 2025 |
| 34 | Southeastern Resources Corp. | Mansfield, TX 76063 | Oil & Gas Operator | Feb 2004 |
| 35 | Southern Alliance Oil Corp. | Grapevine, TX 76099 | Oil & Gas Operator | Oct 2025 |
| 36 | Southlake Exploration, Inc. | Southlake, TX 76092 | Oil & Gas Operator | Oct 2025 |
| 37 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 38 | Spartan Oil Corporation | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 39 | Squyres Oil Co., Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 2024 |
| 40 | Sta-Kel Incorporated | Graham, TX 76450 | Oil & Gas Operator | Dec 2000 |
| 41 | Stamper Operating Co., Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Oct 2025 |
| 42 | Star Production, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Oct 2025 |
| 43 | Stasney, H. R. & Sons, LTD. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 44 | Statex Operating, LLC | Dallas, TX 75229 | Oil & Gas Operator | Mar 2007 |
| 45 | Statex Petroleum Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 46 | STB Energy Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Jul 2008 |
| 47 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 48 | Stephenson Oil & Gas, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Sep 1999 |
| 49 | Stivers Inc | Graham, TX 76450 | Oil & Gas Operator | May 2003 |
| 50 | Stober Oil And Gas Services, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 51 | Stonebriar Oil LLC | Frisco, TX 75034 | Oil & Gas Operator | Oct 2025 |
| 52 | Stoneburner Exploration, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Oct 1997 |
| 53 | Stovall Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 54 | Stratagas, Inc. | Rowlett, TX 75088 | Oil & Gas Operator | May 2006 |
| 55 | Street, Spencer B., Jr. | Graham, TX 76450 | Oil & Gas Operator | Mar 1998 |
| 56 | Sunbelt Salvage | Eastland, TX 76448 | Oil & Gas Operator | Sep 1998 |
| 57 | Sundial Resources, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 58 | Sunterra Energy Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2009 |
| 59 | Supreme Energy Company, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Oct 2025 |
| 60 | Sweetwater Drilling Co., Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Oct 2025 |