| 1 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 2 | Saga Petroleum LLC Of Colorado | Norman, OK 73072 | Oil & Gas Operator | Dec 2025 |
| 3 | Salt Creek Operating LLC | FT Morgan, CO 80701 | Oil & Gas Operator | Mar 2020 |
| 4 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 5 | Samson Oil & Gas USA Inc | Denver, CO 80202 | Oil & Gas Operator | Nov 2025 |
| 6 | Samson Resources Company LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2021 |
| 7 | San Marco Petroleum Inc | Denver, CO 80293 | Oil & Gas Operator | Dec 2025 |
| 8 | Sands-American Corp | | Oil & Gas Operator | Jan 1990 |
| 9 | Shell Rocky Mountain Production LLC | Pinedale, WY 82941 | Oil & Gas Operator | Dec 2008 |
| 10 | Shenandoah Energy Inc | Denver, CO 80265-1050 | Oil & Gas Operator | Dec 2014 |
| 11 | Slaughter J M Oil Company | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2001 |
| 12 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 13 | Smokey Oil Company Inc | Casper, WY 82601 | Oil & Gas Operator | Dec 1996 |
| 14 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 15 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 16 | Southland Royalty Company LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2021 |
| 17 | St Michael Exploration | | Oil & Gas Operator | Jun 1987 |
| 18 | Stanley Energy Inc | Denver, CO 80203 | Oil & Gas Operator | Aug 2004 |
| 19 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Nov 2025 |
| 20 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 21 | Stone Energy LLC | Denver, CO 80202 | Oil & Gas Operator | May 2005 |
| 22 | Summit Gas Resources Inc | Sheridan, WY 82801 | Gas Operator | Dec 2023 |
| 23 | Sunshine Valley Petroleum | Casper, WY 82605 | Oil & Gas Operator | Oct 2025 |
| 24 | Survivor Oil Inc | Tulsa, OK 74133 | Oil & Gas Operator | Sep 2007 |
| 25 | Swepi LP | Houston, TX 77079 | Oil & Gas Operator | Jul 2020 |
| 26 | Synergy Operating LLC | Farmington, NM 87499 | Oil & Gas Operator | Jul 2024 |