| 1 | S & G Operating LLC | McLoud, OK 74851 | Oil & Gas Operator | Feb 2025 |
| 2 | S & S Oil & Gas Corporation | Okemah, OK 74859-0659 | Oil & Gas Operator | Sep 2014 |
| 3 | S & S Star Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Jun 2023 |
| 4 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2025 |
| 5 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 6 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 7 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 8 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Jun 2025 |
| 9 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jun 2025 |
| 10 | Santa Fe Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 11 | Santa Fe Energy Operating Partner LP | Midland, TX 79701 | Oil & Gas Operator | Sep 2004 |
| 12 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 13 | Santa Rita Resources Inc & Subs | | Oil & Gas Operator | Mar 2015 |
| 14 | Scana Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 15 | Scana Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2005 |
| 16 | Scarth Oil & Gas Co | Amarillo, TX 79101 | Oil & Gas Operator | Feb 1999 |
| 17 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 18 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 19 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 20 | Search Drilling Company | Houston, TX 77010 | Oil & Gas Operator | Feb 2001 |
| 21 | Shoreline Operating LLC | Oklahoma City, OK 73113 | Oil & Gas Operator | Mar 2025 |
| 22 | Singer Oil Co LLC | Hennessey, OK 73742 | Oil & Gas Operator | Mar 2025 |
| 23 | SK Plymouth LLC | Houston, TX 77079-1222 | Oil & Gas Operator | Jan 2025 |
| 24 | Skycap Energy, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Mar 2025 |
| 25 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2025 |
| 26 | Slawson, Donald C. | Wichita, KS 67202 | Oil & Gas Operator | Oct 2024 |
| 27 | Sloan Petroleum Service Inc | Guthrie, OK 73044 | Oil & Gas Operator | Mar 2025 |
| 28 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Jun 2025 |
| 29 | Smith Edward F | Avant, OK 74001-0024 | Oil & Gas Operator | Nov 2014 |
| 30 | Sneed William A Bill | Cleveland, OK 74020-1007 | Oil & Gas Operator | Feb 2025 |
| 31 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 32 | Sooner Acquisition Corp | Wichita, KS 67206 | Oil & Gas Operator | Sep 1993 |
| 33 | Sooner Oil & Gas LLC | Fairview, OK 73737-1806 | Oil & Gas Operator | Mar 2025 |
| 34 | Southport Exploration Inc | Tulsa, OK 74103-4015 | Oil & Gas Operator | Nov 1998 |
| 35 | Sparks Resources Inc | Bristow, OK 74010 | Oil & Gas Operator | Mar 2025 |
| 36 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Mar 2025 |
| 37 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 38 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 39 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 40 | Staghorn Petroleum II LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Mar 2025 |
| 41 | Staghorn Petroleum LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Feb 2025 |
| 42 | Stalwart Energy Co | Tulsa, OK 74103-3518 | Oil & Gas Operator | Apr 2014 |
| 43 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2025 |
| 44 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Mar 2025 |
| 45 | Stewart K Petroleum Corp | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 46 | Stone Oak Operating LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Mar 2025 |
| 47 | Stride Energy LLC | Piedmont, OK 73078 | Oil & Gas Operator | Mar 2025 |
| 48 | Struck Rock Oil And Gas LLC | Geary, OK 73040 | Oil & Gas Operator | Feb 2025 |
| 49 | Summit Overseas Expl., Inc. | Denver, CO 80226 | Oil & Gas Operator | Apr 2007 |
| 50 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Jun 2025 |
| 51 | Sundown Energy, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Feb 2025 |
| 52 | Sunterra Energy Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2009 |
| 53 | Superior Midstream, LLC | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2020 |
| 54 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 55 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |