| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | Sage Natural Resources LLC | Tulsa, OK 74170 | Oil & Gas Operator | May 2024 |
| 3 | Sauder Management Company | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2024 |
| 4 | Simpson Oil & Land Co. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2024 |
| 5 | Sitton, Ronnie Incorporated | Graford, TX 76449 | Oil & Gas Operator | Feb 2020 |
| 6 | Slate Holdings, Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | May 2024 |
| 7 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | May 2024 |
| 8 | Spindletop Drilling Co. | Dallas, TX 75230 | Oil & Gas Operator | May 2024 |
| 9 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | May 2024 |
| 10 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 11 | Star Of Texas Energy SRVS, Inc. | Austin, TX 78702 | Oil & Gas Operator | May 2024 |
| 12 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2024 |
| 13 | Stringer Oil & Gas Co., Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Oct 1996 |
| 14 | Stroube Energy Corporation | Dallas, TX 75248 | Oil & Gas Operator | Jan 2012 |
| 15 | Sullivan, Hollis R. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2009 |
| 16 | Sun-Key Oil Co., Inc. | Dublin, TX 76446 | Oil & Gas Operator | May 2024 |