| 1 | S. A. Oil Account | Borger, TX 79008 | Oil & Gas Operator | Dec 1997 |
| 2 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 3 | Samco | Whitesboro, TX 76273 | Oil & Gas Operator | Aug 2013 |
| 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 | Sanders & Smith, L.C. | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2004 |
| 10 | Sargeco, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Sep 2018 |
| 11 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 12 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 13 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 14 | Sigma Exploration Corp., The | Dallas, TX 75230 | Oil & Gas Operator | Sep 1998 |
| 15 | Silver Oil & Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Oct 2025 |
| 16 | Sip'S Oil & Gas Inc | Yukon, OK 73099 | Oil & Gas Operator | Oct 2025 |
| 17 | SLT Dakota Operating, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Oct 2025 |
| 18 | Smith, O. Dale & Smith, A. C. | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2000 |
| 19 | SNW Operating Company | Borger, TX 79008 | Oil & Gas Operator | Oct 2025 |
| 20 | South Florida Investment Company | Pampa, TX 79066 | Oil & Gas Operator | Jun 1997 |
| 21 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 22 | Spencer Oil Company | Borger, TX 79007 | Oil & Gas Operator | Jun 2025 |
| 23 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2025 |
| 24 | Stahl Petroleum Co. | Amarillo, TX 79118 | Oil & Gas Operator | Aug 2003 |
| 25 | Stallion Energy LLC | Houston, TX 77090 | Oil & Gas Operator | Oct 2009 |
| 26 | Stallion Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2017 |
| 27 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 28 | Sunray Oil Co., Inc. | Pampa, TX 79065 | Oil & Gas Operator | Jan 2013 |
| 29 | Suoco Oil Corporation | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |
| 30 | Supa Energy, Inc. | Shamrock, TX 79079 | Oil & Gas Operator | Oct 2025 |