| 1 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 2 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 3 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 4 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 5 | San Francisco-Okla Pet Ex Inc | | Oil & Gas Operator | Apr 2014 |
| 6 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Oct 2025 |
| 7 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2025 |
| 8 | Santa Fe Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 9 | Santa Fe Energy Operating Partner LP | Midland, TX 79701 | Oil & Gas Operator | Sep 2004 |
| 10 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 11 | Scambler Energy Group LTD Co | Colony, OK 73021 | Oil & Gas Operator | Jul 2025 |
| 12 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 13 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 14 | Seals Oil Company | Fox, OK 73435-0222 | Oil & Gas Operator | Nov 2011 |
| 15 | Sho-Bar Energy, Inc. | Harper, KS 67058 | Oil & Gas Operator | May 2025 |
| 16 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | May 2025 |
| 17 | Skycap Energy, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jul 2025 |
| 18 | Sloan Petroleum Service Inc | Guthrie, OK 73044 | Oil & Gas Operator | Jul 2025 |
| 19 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 20 | Sooner Oil & Gas Management Inc | Crescent, OK 73028 | Oil & Gas Operator | Jun 2025 |
| 21 | Sorrels J R Dba Cheyenne Oil Properties | Ponca City, OK 74601 | Oil & Gas Operator | Jul 2022 |
| 22 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 23 | Sparks Resources Inc | Bristow, OK 74010 | Oil & Gas Operator | Jul 2025 |
| 24 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 25 | Staghorn Petroleum II LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Jul 2025 |
| 26 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Jul 2025 |
| 27 | Stewart K Petroleum Corp | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 28 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Oct 2025 |
| 29 | Sundown Energy, Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 30 | Sunstone Energy Company | Tulsa, OK 74153 | Oil & Gas Operator | Aug 2009 |
| 31 | Sweetwater Exploration LLC | Norman, OK 73069-5636 | Oil & Gas Operator | Jun 2025 |
| 32 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |