| 1 | S & H Oil Company | Vernon, TX 76384 | Oil & Gas Operator | Sep 1999 |
| 2 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 3 | S & M Drilling, LLC | Wichita Falls, TX 76308 | Oil Operator | Sep 2023 |
| 4 | S&G Oil LLC | Wichita Falls, TX 76309 | Oil & Gas Operator | Mar 2025 |
| 5 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Mar 2025 |
| 6 | Salvador Oil, LLC | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 7 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 8 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 9 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2025 |
| 10 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2024 |
| 11 | Sanco Operating Company | Bullard, TX 75757 | Oil & Gas Operator | Mar 2025 |
| 12 | Schalk Oil Company, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 13 | Senora Resources, Inc. | Dime Box, TX 77853 | Oil & Gas Operator | Mar 2025 |
| 14 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 15 | Shelley, Richard W | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2015 |
| 16 | Sherman Oil Company LLC | Wichita Falls, TX 76308 | Oil Operator | Mar 2025 |
| 17 | Shiloh Oil Company LLC | Williston, FL 32696 | Oil & Gas Operator | Mar 2025 |
| 18 | Sissom Oil Field Services, LLC | Graham, TX 76450 | Oil Operator | Mar 2025 |
| 19 | Slant Operating, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Mar 2025 |
| 20 | Slate Holdings, Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Mar 2025 |
| 21 | Smith Family LTD Partnership | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2004 |
| 22 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 23 | Southern Exploration, Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Aug 2023 |
| 24 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 25 | Special JHR Corp | Bridgeville, PA 15017 | Oil & Gas Operator | Mar 2025 |
| 26 | Spitfire Partners, LLC | Dallas, TX 75225 | Oil Operator | Mar 2025 |
| 27 | Spragins, Ed | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 28 | Springfield Oil Services, Inc. | Mamaroneck, NY 10543 | Oil & Gas Operator | Mar 2025 |
| 29 | Spruiell Drilling Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2025 |
| 30 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2025 |
| 31 | Stagg Investment Group, Inc. | Midland, TX 79701 | Oil Operator | May 2013 |
| 32 | Staley, Jack C. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2000 |
| 33 | Steinman, Frank C. | Electra, TX 76360 | Oil & Gas Operator | Mar 2025 |
| 34 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 35 | Stephens, Clayton E. | Dallas, TX 75229 | Oil & Gas Operator | Nov 2011 |
| 36 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | Mar 2025 |
| 37 | Sullivan, Hollis R. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2009 |
| 38 | Swanson, Tom | Electra, TX 76360 | Oil & Gas Operator | Oct 2004 |
| 39 | Swanson, Tommy Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Mar 2017 |
| 40 | Syntax Energy Corporation | Denton, TX 76210 | Oil Operator | Mar 2025 |