| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | S & P Energy | Benbrook, TX 76126 | Oil & Gas Operator | Oct 1994 |
| 3 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Mar 2025 |
| 4 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 5 | San Angelo Cetco, Inc. | San Angelo, TX 76901 | Oil & Gas Operator | Mar 1998 |
| 6 | Schalk Oil Company, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 7 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 8 | Sedona Oil & Gas Corporation | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 9 | Sequoia Fossil Fuels, Inc. | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 10 | Shoshone Oil Company | Dallas, TX 75244 | Oil & Gas Operator | May 1994 |
| 11 | Sierra Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2008 |
| 12 | Simpson Oil Company | Odessa, TX 79760 | Oil & Gas Operator | Oct 2004 |
| 13 | Sinclair Energy Corporation | Fort Worth, TX 76177 | Oil & Gas Operator | Mar 2025 |
| 14 | Smail, James R. | Big Prairie, OH 44611 | Oil & Gas Operator | Dec 1998 |
| 15 | Smith Operating And MGMT Co. | Shreveport, LA 71161 | Oil & Gas Operator | Jun 2023 |
| 16 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 17 | Smith, Joe T., Inc. | Hawley, TX 79525 | Oil & Gas Operator | Mar 2025 |
| 18 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 19 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 20 | Spalding Energy, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 21 | Spenergy Corp. | Midland, TX 79701 | Oil & Gas Operator | Dec 1999 |
| 22 | Spi Operations LLC | Midland, TX 79710 | Oil & Gas Operator | Jan 2013 |
| 23 | Spiral Energy Corp. | Midland, TX 79705 | Oil & Gas Operator | Dec 2019 |
| 24 | Sproul, C. R. Inc. | Eldorado, TX 76936 | Oil & Gas Operator | Aug 2000 |
| 25 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 26 | Stallion Oil Company | Lafayette, LA 70505 | Oil & Gas Operator | Jun 2004 |
| 27 | Star Production, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Mar 2025 |
| 28 | Startex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 29 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 30 | Stream Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2024 |
| 31 | Subsurface Production, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Mar 2025 |
| 32 | Sullivan, Hollis R. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2009 |
| 33 | Swartz Oil Company | San Angelo, TX 76906 | Oil & Gas Operator | Mar 2025 |
| 34 | Sweetwater Drilling Co., Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2025 |