| 1 | Sandlin Oil Corp | Dacono, CO 80514 | Oil & Gas Operator | Aug 2025 |
| 2 | Sawtooth Energy Partners LLC | | Oil & Gas Operator | Nov 2005 |
| 3 | Schneider Energy Services Inc | | Oil & Gas Operator | Jul 2025 |
| 4 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 5 | Shepler & Thomas, Inc. | Edmond, OK 73013 | Oil & Gas Operator | Jun 2025 |
| 6 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 7 | Smith Energy Corp | | Oil & Gas Operator | Jan 2024 |
| 8 | Smith Energy LLC | | Oil & Gas Operator | Jul 2025 |
| 9 | Smith Oil Properties Inc | | Oil & Gas Operator | Nov 2022 |
| 10 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 11 | Soper Production | | Oil & Gas Operator | Dec 2011 |
| 12 | Southwestern Production Corporation | Lakewood, CO 80228 | Oil & Gas Operator | Aug 2025 |
| 13 | Sovereign Energy LLC | | Oil & Gas Operator | Sep 2011 |
| 14 | Sovereign Operating Company LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2016 |
| 15 | Spellbound Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2025 |
| 16 | St James Energy Operating Inc | | Oil & Gas Operator | Aug 2013 |
| 17 | Starlight Resources LLC | | Oil & Gas Operator | Jun 2006 |
| 18 | Stelbar Oil Corporation, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Jun 2025 |
| 19 | Stoneham Production LLC | | Oil & Gas Operator | Jul 2025 |
| 20 | Strachan Exploration Inc | Englewood, CO 80112 | Oil & Gas Operator | Jul 2025 |
| 21 | Summit Oil & Gas LLC | | Oil & Gas Operator | Aug 2025 |
| 22 | Sunburst, Inc. | Wheat Ridge, CO 80033 | Oil & Gas Operator | Jul 2025 |
| 23 | Sundance Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Jul 2014 |
| 24 | Sundance Resources, Inc. | Rio VIsta, TX 76093 | Oil & Gas Operator | Mar 2012 |
| 25 | Swift Beef Company | | Oil & Gas Operator | May 2006 |
| 26 | Synergy Resources Corporation | | Oil & Gas Operator | Oct 2022 |