| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | S & W Oil & Gas, LLC | Pampa, TX 79066 | Oil & Gas Operator | Jun 2025 |
| 3 | Sage Petroleum Co. | Borger, TX 79007 | Oil & Gas Operator | Dec 2002 |
| 4 | Sanchez Production, LLC | Pampa, TX 79065 | Oil & Gas Operator | Jun 2025 |
| 5 | Schlachter Operating Corporation | Dallas, TX 75225 | Oil & Gas Operator | Jun 2025 |
| 6 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 7 | Schlachter, David A., Estate Of | Dallas, TX 75225 | Oil & Gas Operator | Jan 2000 |
| 8 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Jun 2025 |
| 9 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 10 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 11 | Seek Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 12 | Service Drilling Co. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1998 |
| 13 | Service Drilling Co., L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2003 |
| 14 | Sidwell Oil & Gas, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2014 |
| 15 | Sidwell Operating Company, L.P. | Amarillo, TX 79105 | Oil & Gas Operator | Jun 2025 |
| 16 | Sigma Exploration Corp., The | Dallas, TX 75230 | Oil & Gas Operator | Sep 1998 |
| 17 | Sinow, G. S. | Pampa, TX 79066 | Oil & Gas Operator | Oct 1995 |
| 18 | SLT Dakota Operating, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Jun 2025 |
| 19 | Smith, W.T. | Panhandle, TX 79068 | Oil & Gas Operator | Nov 2005 |
| 20 | Snappy Services, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Jun 2025 |
| 21 | SNW Operating Company | Borger, TX 79008 | Oil & Gas Operator | Jun 2025 |
| 22 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 23 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Jun 2025 |
| 24 | Sportsman Oil, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Nov 1998 |
| 25 | Stahl Petroleum Co. | Amarillo, TX 79118 | Oil & Gas Operator | Aug 2003 |
| 26 | Stallion Energy LLC | Houston, TX 77090 | Oil & Gas Operator | Oct 2009 |
| 27 | Stallion Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2017 |
| 28 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2025 |
| 29 | Sukay Oil & Gas, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Aug 2003 |
| 30 | Sullivan & Co. | Tulsa, OK 74114 | Oil & Gas Operator | May 2022 |
| 31 | Suoco Oil Corporation | Pampa, TX 79066 | Oil & Gas Operator | Jun 2025 |