| 1 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 2 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 3 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 4 | Sandler Raymond C | Los Angeles, CA 90067 | Oil Operator | Dec 1999 |
| 5 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Dec 2025 |
| 6 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Dec 2025 |
| 7 | Santa Fe Energy Operating Partner LP | Midland, TX 79701 | Oil & Gas Operator | Sep 2004 |
| 8 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 9 | Scambler Energy Group LTD Co | Colony, OK 73021 | Oil & Gas Operator | Oct 2025 |
| 10 | Scana Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 11 | Scoggins Production LLC | Enid, OK 73703-3002 | Oil & Gas Operator | Oct 2025 |
| 12 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 13 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 14 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 15 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 16 | Select Exploration Group LLC | Eufaula, OK 74432 | Oil & Gas Operator | May 2024 |
| 17 | Sidwell Oil & Gas, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2014 |
| 18 | Siegfried R H Inc | Tulsa, OK 74104 | Oil & Gas Operator | Mar 2008 |
| 19 | Sierra Resources, Inc. | Oklahoma City, OK 73142 | Oil & Gas Operator | Sep 2025 |
| 20 | Skycap Energy, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Oct 2025 |
| 21 | SLT Dakota Operating, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Dec 2025 |
| 22 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 23 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 24 | Sonata Oil & Gas Corp Inc | Stratford, OK 74812 | Oil & Gas Operator | Apr 2014 |
| 25 | Sooner Exploration & Development Co Inc | Enid, OK 73702-3525 | Oil & Gas Operator | Oct 2023 |
| 26 | Sooner Oil & Gas LLC | Fairview, OK 73737-1806 | Oil & Gas Operator | Oct 2025 |
| 27 | Sooner Oil & Gas Management Inc | Crescent, OK 73028 | Oil & Gas Operator | Oct 2025 |
| 28 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 29 | Special Energy Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Dec 2025 |
| 30 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 31 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 32 | Stewart K Petroleum Corp | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 33 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Dec 2025 |
| 34 | Sundown Energy, Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 35 | Sweetwater Exploration LLC | Norman, OK 73069-5636 | Oil & Gas Operator | Oct 2025 |
| 36 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |