| 1 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 2 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 3 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Oct 2025 |
| 4 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 5 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 6 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 7 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 8 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 9 | Santa Fe Energy Oper. Part., LP | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 10 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 11 | Santana Energy Services, LLC | Baton Rouge, LA 70809 | Oil & Gas Operator | Oct 2025 |
| 12 | Sassco Petroleum, Inc. | Austin, TX 78763 | Oil & Gas Operator | Feb 2000 |
| 13 | Schmid Properties Inc | Hico, TX 76457 | Oil & Gas Operator | Oct 2025 |
| 14 | Scully Energy Corporation | Salado, TX 76571 | Oil & Gas Operator | Mar 2012 |
| 15 | Seguro Well Service, Inc. | Gonzales, TX 78629 | Oil & Gas Operator | Oct 2025 |
| 16 | Sellers Lease Service, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | Oct 2025 |
| 17 | Sellers' Lease Service | Flatonia, TX 78941 | Oil & Gas Operator | Jul 1994 |
| 18 | Senora Resources, Inc. | Dime Box, TX 77853 | Oil & Gas Operator | Oct 2025 |
| 19 | Shale Hunter, LLC | Irving, TX 75039 | Oil & Gas Operator | Jan 2016 |
| 20 | Sharon Hunter Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Sep 2012 |
| 21 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Oct 2025 |
| 22 | Shield Petroleum | College Sta, TX 77845 | Oil & Gas Operator | Oct 2025 |
| 23 | Silverbow Resources Oper, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 24 | Sisters Operating Company | Victoria, TX 77904 | Oil & Gas Operator | Nov 2010 |
| 25 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 26 | SN Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 27 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 28 | Southern Royalty Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 1997 |
| 29 | Southwest Land & Minerals, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Aug 2003 |
| 30 | Southwest Oil & Land, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Dec 1999 |
| 31 | Southwest Resources, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Oct 2025 |
| 32 | Spur Operating Co. | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 33 | Square One Corporation | Giddings, TX 78942 | Oil & Gas Operator | Dec 2012 |
| 34 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 35 | Sto Operating Company | San Antonio, TX 78258 | Oil & Gas Operator | Oct 2025 |
| 36 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 37 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 38 | Striper Oil, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Apr 2002 |
| 39 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Oct 2025 |
| 40 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |