| 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 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 4 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 5 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 6 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 7 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 8 | Sand Springs Oil & Gas Co. | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2025 |
| 9 | Sauder Management Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 10 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 11 | Seitz, J. R. & Adam | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2008 |
| 12 | Seitz, J. R. & Adam, LTD. | Wichita Falls, TX 76307 | Oil Operator | Oct 2025 |
| 13 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 14 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Oct 2025 |
| 15 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Oct 2025 |
| 16 | Silver Creek Resources, LLC | Irving, TX 75038 | Oil & Gas Operator | Apr 2017 |
| 17 | Silver Spike Energy Oper, LLC | Midland, TX 79710 | Oil & Gas Operator | Dec 2015 |
| 18 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 19 | Snuggs Oil Company | Gainesville, TX 76240 | Oil & Gas Operator | Jan 2024 |
| 20 | Southstar Energy Corporation | Ardmore, OK 73401 | Gas Operator | Aug 1990 |
| 21 | Spade Energy L.L.C. | Wichita Falls, TX 76310 | Oil & Gas Operator | Oct 2025 |
| 22 | Spence Energy Company | Dallas, TX 75360 | Oil & Gas Operator | Oct 2025 |
| 23 | St. Cajetan Oil Company, LLC | Gainesville, TX 76240 | Oil & Gas Operator | Oct 2025 |
| 24 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 25 | Star-Jet Co. | Gainesville, TX 76240 | Oil Operator | Oct 2025 |
| 26 | Starlight Ridge | Whitesboro, TX 76273 | Oil & Gas Operator | Oct 2025 |
| 27 | Staub, Larry | Richardson, TX 75080 | Oil & Gas Operator | Aug 2003 |
| 28 | Staub, Larry, Inc. | Azle, TX 76020 | Oil & Gas Operator | Oct 2025 |
| 29 | STB Energy Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Jul 2008 |
| 30 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 31 | Street, Spencer B., Jr. | Graham, TX 76450 | Oil & Gas Operator | Mar 1998 |