| 1 | Saba Energy Of Texas Inc | Houston, TX 77042 | Oil & Gas Operator | Jul 2007 |
| 2 | Saxon Oil Company | Dallas, TX 75204 | Oil & Gas Operator | Oct 2009 |
| 3 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 4 | Sharples Phillip T Trust | Denver, CO 80264 | Oil & Gas Operator | Nov 2020 |
| 5 | Signal Hill Company LLC | Cody, WY 82414 | Oil & Gas Operator | Dec 2024 |
| 6 | Signal Hill Operating LLC | | Oil & Gas Operator | Aug 2025 |
| 7 | Six Bar Oil LLC | Pine Haven, WY 82721 | Oil & Gas Operator | Jul 2025 |
| 8 | Skinner Oil & Gas LLC | Gillette, WY 82717 | Oil & Gas Operator | Jan 2024 |
| 9 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 10 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 11 | Smith Conley P Operating Co | Eglewood, CO 80112-3640 | Oil & Gas Operator | Jun 2000 |
| 12 | Smokey Oil Company Inc | Casper, WY 82601 | Oil & Gas Operator | Dec 1996 |
| 13 | Snowy Owl LLC | Gillette, WY 82717 | Oil & Gas Operator | Aug 2025 |
| 14 | Southern Union Exploration | | Oil Operator | Jan 1990 |
| 15 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 16 | Southwestern Production Corporation | Lakewood, CO 80228 | Oil & Gas Operator | Aug 2025 |
| 17 | St Michael Exploration | | Oil & Gas Operator | Jun 1987 |
| 18 | Star Oil Operating Company LLC | Laramie, WY 82073 | Oil & Gas Operator | Aug 2025 |
| 19 | Star Resources LLC | Englewood, CO 80155-5185 | Oil & Gas Operator | Dec 2013 |
| 20 | Sterling Energy Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 1995 |
| 21 | Stone Petroleum Corporation | | Oil & Gas Operator | Dec 1996 |
| 22 | Stringer E M | | Oil Operator | May 1996 |
| 23 | Swepi LP | Houston, TX 77079 | Oil & Gas Operator | Jul 2020 |
| 24 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |