| 1 | S & S Star Operating, LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Jun 2023 |
| 2 | S N D Energy Company, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Oct 2025 |
| 3 | S/H Petroleum Corporation | Hennessey, OK 73742-0477 | Oil & Gas Operator | Feb 2016 |
| 4 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 5 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 6 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 7 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 8 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 9 | Sandlot Oil & Gas LLC | Gruver, TX 79040 | Oil & Gas Operator | Oct 2025 |
| 10 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Oct 2025 |
| 11 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2025 |
| 12 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 13 | Santa Fe-Andover Oil Co | Tulsa, OK 74172 | Oil & Gas Operator | Sep 2000 |
| 14 | Scana Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 15 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 16 | Scana Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2005 |
| 17 | Scarth Oil & Gas Co | Amarillo, TX 79101 | Oil & Gas Operator | Feb 1999 |
| 18 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 19 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 20 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 21 | Seals And Brown Oil Operating | Norman, OK 73072-3020 | Oil & Gas Operator | Sep 2024 |
| 22 | Search Drilling Company | Houston, TX 77010 | Oil & Gas Operator | Feb 2001 |
| 23 | Seneca Oil Company | Tulsa, OK 74121-1518 | Oil & Gas Operator | Jan 2015 |
| 24 | Sensor Oil & Gas Inc | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 25 | Seymour Oil Co., Inc. | Edmond, OK 73025 | Oil & Gas Operator | Jul 2011 |
| 26 | Shelly Energy Inc. | Berwyn, PA 19312 | Oil & Gas Operator | Jul 2025 |
| 27 | Shoshone Oil And Gas Inc | Lindsay, OK 73052-0217 | Oil & Gas Operator | Jan 2020 |
| 28 | Siegfried R H Inc | Tulsa, OK 74104 | Oil & Gas Operator | Mar 2008 |
| 29 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Oct 2025 |
| 30 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | May 2025 |
| 31 | Singer Oil Co LLC | Hennessey, OK 73742 | Oil & Gas Operator | Jul 2025 |
| 32 | Singer Oil Company | Oklahoma City, OK 73148 | Oil & Gas Operator | May 2025 |
| 33 | Skycap Energy, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jul 2025 |
| 34 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 35 | Sloan Petroleum Service Inc | Guthrie, OK 73044 | Oil & Gas Operator | Jul 2025 |
| 36 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 37 | Smith Conley P Operating Co | Eglewood, CO 80112-3640 | Oil & Gas Operator | Jun 2000 |
| 38 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 39 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 40 | Snyder Partners | Cody, WY 82414 | Oil & Gas Operator | Jul 2025 |
| 41 | Sooner Oil & Gas LLC | Fairview, OK 73737-1806 | Oil & Gas Operator | Jul 2025 |
| 42 | Sooner Trend Exploration Inc | Kingfisher, OK 73750-4752 | Oil & Gas Operator | Dec 2015 |
| 43 | Southerland Marquieta Dba Keta Oil Company | Loco, OK 73442 | Oil & Gas Operator | Jun 2025 |
| 44 | Southern Resources Inc | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Jun 2025 |
| 45 | Sparks Petroleum Company | Oklahoma City, OK 73128 | Oil & Gas Operator | Mar 1998 |
| 46 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Jul 2025 |
| 47 | St Joe Petroleum U S Corp | | Oil & Gas Operator | Aug 2000 |
| 48 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 49 | Staab Alan R | Tulsa, OK 74114-4213 | Oil & Gas Operator | Sep 2010 |
| 50 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 51 | Staghorn Petroleum II LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Jul 2025 |
| 52 | Staghorn Petroleum LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Jun 2025 |
| 53 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |
| 54 | Stalwart Energy Co | Tulsa, OK 74103-3518 | Oil & Gas Operator | Apr 2014 |
| 55 | Star Resources LLC | Englewood, CO 80155-5185 | Oil & Gas Operator | Dec 2013 |
| 56 | Statoil Oil & Gas LP | Austin, TX 78730 | Oil & Gas Operator | Oct 2018 |
| 57 | Stephen Michael Inc | Midwest City, OK 73130-5200 | Oil & Gas Operator | Oct 2015 |
| 58 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Jul 2025 |
| 59 | Stewart K Petroleum Corp | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 60 | Stoneriver Energy, LLC | Lubbock, TX 79424 | Oil & Gas Operator | Oct 2025 |
| 61 | Struck Rock Oil And Gas LLC | Geary, OK 73040 | Oil & Gas Operator | Jun 2025 |
| 62 | Sullivan & Co. | Tulsa, OK 74114 | Oil & Gas Operator | May 2022 |
| 63 | Sullivan And Company LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jun 2025 |
| 64 | Summit Resources Management LLC | Edmond, OK 73083 | Oil & Gas Operator | Jul 2025 |
| 65 | Superior Oil & Gas Company Of Oklahoma | Calumet, OK 73014-8528 | Oil & Gas Operator | Jan 2024 |
| 66 | Sutton Energy LLC | Ada, OK 74820 | Oil & Gas Operator | Jun 2025 |
| 67 | Sweetwater Exploration LLC | Norman, OK 73069-5636 | Oil & Gas Operator | Jun 2025 |
| 68 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 69 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |