| 1 | S M K Energy Corporation | Corpus Chrsti, TX 78475 | Oil & Gas Operator | Apr 2026 |
| 2 | Sabine Energy Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 3 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 4 | Sabine Oil & Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 5 | Sabine Pipe & Supply Co. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2004 |
| 6 | Salt Creek Resources, LLC | Caney, KS 67333 | Oil Operator | Oct 2019 |
| 7 | Samson Exploration LLC | Tulsa, OK 74101 | Oil & Gas Operator | Feb 2026 |
| 8 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 9 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 10 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2026 |
| 11 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2026 |
| 12 | Scheriger Production | Graham, TX 76450 | Oil & Gas Operator | Jun 2006 |
| 13 | SDG Operating Company, Inc | Tyler, TX 75701 | Oil & Gas Operator | Apr 2026 |
| 14 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 15 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 16 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 17 | Sendero Energy Inc. | Dallas, TX 75205 | Oil & Gas Operator | Apr 2026 |
| 18 | Senora Resources, Inc. | Dime Box, TX 77853 | Oil & Gas Operator | Apr 2026 |
| 19 | Shappell Oil Company | Holliday, TX 76366 | Oil & Gas Operator | Sep 2012 |
| 20 | Shappell Oil Company, L.L.C. | Harrisonburg, LA 71340 | Oil & Gas Operator | Apr 2026 |
| 21 | Shelby Operating Company | Dallas, TX 75205 | Oil & Gas Operator | Apr 2026 |
| 22 | Shelby Production Co. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2009 |
| 23 | Shelby, Michael H. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2026 |
| 24 | Sheridan Energy,Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 25 | Sheridan Production Co III, LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2026 |
| 26 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Jan 2026 |
| 27 | Shield Operating Co. | Georgetown, TX 78627 | Oil & Gas Operator | Aug 2003 |
| 28 | Shivers, Linward, Operator | Shreveport, LA 71161 | Oil & Gas Operator | Sep 1997 |
| 29 | Shoco Production LLC | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2026 |
| 30 | Shoco Production, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | May 2020 |
| 31 | Shuler Drilling Co., Inc. | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2025 |
| 32 | Sikes Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Jun 2003 |
| 33 | Silver Hill Energy Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Apr 2026 |
| 34 | Silver Oak Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Dec 2009 |
| 35 | Silver Oak Operating, LLC | Longview, TX 75604 | Oil & Gas Operator | Apr 2026 |
| 36 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Feb 2026 |
| 37 | Sinclair Development, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2026 |
| 38 | Siroco Operating Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2010 |
| 39 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 40 | Slant Operating, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Apr 2026 |
| 41 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Apr 2026 |
| 42 | Smith Operating And MGMT Co. | Shreveport, LA 71161 | Oil & Gas Operator | Jun 2023 |
| 43 | Smith, R. E. Interests, Inc. | Houston, TX 77027 | Oil & Gas Operator | Mar 1998 |
| 44 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 45 | Sogc, Inc. | Salt Lake Cty, UT 84131 | Oil & Gas Operator | Feb 2026 |
| 46 | Sojitz Energy Venture, Inc. | Houston, TX 77042 | Oil & Gas Operator | Feb 2018 |
| 47 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 2026 |
| 48 | Soldier Creek Energy, LLC | Edmond, OK 73013 | Oil & Gas Operator | Apr 2026 |
| 49 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 50 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 51 | Sonat Exploration Company-MCR | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 52 | Southcoast Production Inc | Houston, TX 77010 | Oil & Gas Operator | Apr 2026 |
| 53 | Southwest Operating, Inc.-Tyler | Tyler, TX 75701 | Oil & Gas Operator | Apr 2026 |
| 54 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | Apr 2026 |
| 55 | Spartan Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2013 |
| 56 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Apr 2026 |
| 57 | Sponte Operating, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2026 |
| 58 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 59 | Sterling Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2015 |
| 60 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 61 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2026 |
| 62 | Stroube Energy Corporation | Dallas, TX 75248 | Oil & Gas Operator | Jan 2012 |
| 63 | Stroud Energy, LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2006 |
| 64 | Stroud Oil Properties, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2013 |
| 65 | Stuart Oil & Gas | Longview, TX 75606 | Oil & Gas Operator | Apr 2026 |
| 66 | Sun River Operating, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Apr 2026 |
| 67 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Apr 2026 |
| 68 | Sunland Production Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2026 |
| 69 | Sunwest Operating Company L.L.C. | Englewood, CO 80155 | Oil & Gas Operator | Aug 2002 |
| 70 | SW Operating, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Sep 2000 |
| 71 | Sydri Operating, LLC | Dallas, TX 75231 | Oil & Gas Operator | Apr 2026 |