| 1 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 2 | Sage Butte PRB Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2025 |
| 3 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 4 | Samson Resources Company LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2021 |
| 5 | Sauer Bill Oil & Gas Company LLC | Casper, WY 82604 | Oil & Gas Operator | Jun 1999 |
| 6 | Sceptre Resources Inc | | Oil & Gas Operator | Dec 2007 |
| 7 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 8 | Shenandoah Oil Corporation | | Oil & Gas Operator | Jun 1979 |
| 9 | Sierra Trading Corporation | | Oil & Gas Operator | Sep 1978 |
| 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 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 15 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 16 | Snowy Owl LLC | Gillette, WY 82717 | Oil & Gas Operator | Aug 2025 |
| 17 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 18 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 19 | South Coast Oil Corporation | Boulder, CO 80302 | Oil & Gas Operator | Oct 2015 |
| 20 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 21 | Southern Union Exploration | | Oil Operator | Jan 1990 |
| 22 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 23 | Southport Exploration Inc | Tulsa, OK 74103-4015 | Oil & Gas Operator | Nov 1998 |
| 24 | Southwestern Production Corporation | Lakewood, CO 80228 | Oil & Gas Operator | Aug 2025 |
| 25 | Spirit Energy Inc | Edmond, OK 73034 | Oil & Gas Operator | Apr 1999 |
| 26 | St Michael Exploration | | Oil & Gas Operator | Jun 1987 |
| 27 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 28 | Sterling Energy Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 1995 |
| 29 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 30 | Stone Energy LLC | Denver, CO 80202 | Oil & Gas Operator | May 2005 |
| 31 | Sunshine Valley Petroleum | Casper, WY 82605 | Oil & Gas Operator | Aug 2025 |