| 1 | Saba Energy Of Texas Inc | Houston, TX 77042 | Oil & Gas Operator | Jul 2007 |
| 2 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 3 | Sanchez-O'Brien | | Oil & Gas Operator | Dec 1984 |
| 4 | Schlaikjer A L | | Oil Operator | Feb 1997 |
| 5 | Seahawk Oil International Inc | Newport Beach, CA 92660 | Oil & Gas Operator | Oct 1997 |
| 6 | Shelco | Maysville, MO 64469 | Oil & Gas Operator | May 2021 |
| 7 | Shenandoah Energy Inc | Denver, CO 80265-1050 | Oil & Gas Operator | Dec 2014 |
| 8 | Sierra Trading Corporation | | Oil & Gas Operator | Sep 1978 |
| 9 | Six Bar Oil LLC | Pine Haven, WY 82721 | Oil & Gas Operator | Jul 2025 |
| 10 | Skinner'S Resources & Expl Inc | | Oil & Gas Operator | Jun 2007 |
| 11 | Skull Creek A LLC | Douglas, WY 82633 | Oil & Gas Operator | Jul 2025 |
| 12 | Skyline Oil Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Jan 1987 |
| 13 | Slaughter J M Oil Company | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2001 |
| 14 | Snowy Owl LLC | Gillette, WY 82717 | Oil & Gas Operator | Aug 2025 |
| 15 | Sois-Osage Inc | | Oil & Gas Operator | Oct 2006 |
| 16 | South Coast Oil Corporation | Boulder, CO 80302 | Oil & Gas Operator | Oct 2015 |
| 17 | South Pass Petroleum Inc | Casper, WY 82601 | Oil & Gas Operator | Aug 2025 |
| 18 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 19 | Southport Exploration Inc | Tulsa, OK 74103-4015 | Oil & Gas Operator | Nov 1998 |
| 20 | Stewart Petroleum Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Dec 2023 |
| 21 | Stringer E M | | Oil Operator | May 1996 |
| 22 | Sunshine Valley Petroleum | Casper, WY 82605 | Oil & Gas Operator | Aug 2025 |
| 23 | Surtek Inc | | Oil & Gas Operator | May 1993 |
| 24 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |