| 1 | S A C Operating Inc | Woodward, OK 73802-1749 | Oil & Gas Operator | Jan 1999 |
| 2 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 3 | Samson Exploration LLC | Tulsa, OK 74101 | Oil & Gas Operator | Feb 2026 |
| 4 | Samson Gas Producing Company | Tulsa, OK 74103 | Oil & Gas Operator | May 2001 |
| 5 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 6 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2026 |
| 7 | Sandridge Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2018 |
| 8 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Apr 2026 |
| 9 | Savoy Energy LP | Traverse City, MI 49685-1560 | Oil & Gas Operator | Feb 2026 |
| 10 | Schmid Properties, Inc. | Hico, TX 76457 | Oil & Gas Operator | Apr 2026 |
| 11 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 12 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 13 | Seaport Inc | Oklahoma City, OK 73131 | Oil & Gas Operator | Jan 2026 |
| 14 | Sec Production Inc | Edmond, OK 73013-3709 | Oil & Gas Operator | Feb 2026 |
| 15 | Senax Inc | Tulsa, OK 74105-2206 | Oil & Gas Operator | Feb 2026 |
| 16 | Shar Alan Oil Company | | Oil & Gas Operator | Oct 2005 |
| 17 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 18 | Shell Western Expl & Prod Inc | Houston, TX 77251 | Oil & Gas Operator | Mar 2015 |
| 19 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Jan 2026 |
| 20 | Sho-Bar Energy Inc | Harper, KS 67058 | Oil & Gas Operator | Jan 2026 |
| 21 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Feb 2026 |
| 22 | Singer Oil Co LLC | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2026 |
| 23 | Singer-Fleischaker Oil Op Co | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2002 |
| 24 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 25 | Sloan Petroleum Service Inc | Guthrie, OK 73044 | Oil & Gas Operator | Feb 2026 |
| 26 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Apr 2026 |
| 27 | Smith Edward F | Avant, OK 74001-0024 | Oil & Gas Operator | Nov 2014 |
| 28 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 29 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 30 | Snyder Partners | Cody, WY 82414 | Oil & Gas Operator | Jan 2026 |
| 31 | South Forty Inc (The) | Laverne, OK 73848 | Oil & Gas Operator | Mar 2015 |
| 32 | Southwest Exploration Company | Oklahoma City, OK 73132-2230 | Oil & Gas Operator | Jun 2017 |
| 33 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | Apr 2026 |
| 34 | Sparks Petroleum Company | Oklahoma City, OK 73128 | Oil & Gas Operator | Mar 1998 |
| 35 | Special Energy Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2026 |
| 36 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Feb 2026 |
| 37 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Apr 2026 |
| 38 | Spur Operating Co. | Austin, TX 78701 | Oil & Gas Operator | Apr 2026 |
| 39 | St Johns Operating #1 LP | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 40 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 41 | Staab Alan R | Tulsa, OK 74114-4213 | Oil & Gas Operator | Sep 2010 |
| 42 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2026 |
| 43 | Statex Operating, LLC | Dallas, TX 75229 | Oil & Gas Operator | Mar 2007 |
| 44 | Statex Petroleum Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 45 | Stephens Exploration, Inc. | Dallas, TX 75367 | Oil & Gas Operator | Feb 2026 |
| 46 | Stewart K Petroleum Corp | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 47 | Stone Oak Operating LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Feb 2026 |
| 48 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2026 |
| 49 | Stricker Resources Inc | Morris, OK 74445 | Oil & Gas Operator | Jan 2026 |
| 50 | Summit Resources, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2016 |
| 51 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Apr 2026 |
| 52 | Sundown Energy, Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 53 | Sunterra Energy Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2009 |
| 54 | Suoco Oil Corporation | Pampa, TX 79066 | Oil & Gas Operator | Apr 2026 |
| 55 | Sweetwater Exploration LLC | Norman, OK 73069-5636 | Oil & Gas Operator | Jan 2026 |