| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | Sabco Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2011 |
| 3 | Sabco Operating Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2018 |
| 4 | Salida Exploration, LLC | Abilene, TX 79603 | Oil & Gas Operator | Oct 2025 |
| 5 | Salvador Oil, LLC | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 6 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 7 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 8 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 9 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 10 | Samurai Operating Co. L.L.C. | Dayton, TX 77535 | Oil & Gas Operator | Oct 2025 |
| 11 | San Patricio Corporation | Dinero, TX 78350 | Oil & Gas Operator | Sep 2003 |
| 12 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 13 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 14 | Sandalwood Exploration, L.P. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 15 | Sandalwood Oil & Gas, Inc. | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 16 | Sandel Operating Company | Huntsville, TX 77340 | Oil & Gas Operator | Oct 2025 |
| 17 | Sandia Energy Corporation-NM | Holdenville, OK 74848 | Oil & Gas Operator | Aug 2003 |
| 18 | Santos USA Corp. | Houston, TX 77042 | Oil & Gas Operator | Dec 2008 |
| 19 | Sarita Energy Resources, LTD. | Houston, TX 77277 | Oil & Gas Operator | Oct 2025 |
| 20 | Savage Exploration, Inc. | San Marcos, TX 78666 | Oil & Gas Operator | Oct 2025 |
| 21 | Saxet Energy, LTD. | Houston, TX 77057 | Oil & Gas Operator | Mar 2004 |
| 22 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 23 | Scully Energy Corporation | Salado, TX 76571 | Oil & Gas Operator | Mar 2012 |
| 24 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 25 | Serra Energy, Inc. | Hailey, ID 83333 | Oil & Gas Operator | May 2011 |
| 26 | SFM Holdings, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 1995 |
| 27 | Shell Western E&P | Houston, TX 77001 | Oil & Gas Operator | Oct 2025 |
| 28 | Sierra Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2008 |
| 29 | Silver Fox Oil & Gas LLC | McAllen, TX 78504 | Oil & Gas Operator | Oct 2025 |
| 30 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | May 2025 |
| 31 | Sisters Operating Company | Victoria, TX 77904 | Oil & Gas Operator | Nov 2010 |
| 32 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 33 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 34 | Smith Production Inc. | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 35 | South Central Texas Oil & Gas Co | Houston, TX 77060 | Oil & Gas Operator | Oct 2025 |
| 36 | Southcoast Production Inc | Houston, TX 77010 | Oil & Gas Operator | Oct 2025 |
| 37 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 38 | Southern Resource Company | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Mar 2022 |
| 39 | Southern Royalty Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 1997 |
| 40 | Southwest Gathering Company | Alice, TX 78332 | Oil & Gas Operator | Oct 2025 |
| 41 | Southwest Land & Minerals, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Aug 2003 |
| 42 | Southwest Oil & Land, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Dec 1999 |
| 43 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 44 | Spiller, Robert S. | San Antonio, TX 78213 | Oil & Gas Operator | Oct 1995 |
| 45 | Spur Operating Co. | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 46 | Star Production, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Oct 2025 |
| 47 | Starco Exploration, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Oct 2025 |
| 48 | Statia Enterprises, Inc | Irving, TX 75014 | Oil & Gas Operator | Oct 2025 |
| 49 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 50 | Stinger Oil & Gas Inc. | Sherman Oaks, CA 91403 | Oil & Gas Operator | Oct 2013 |
| 51 | Stone & Webster Oil Company, Inc | Houston, TX 77002 | Oil & Gas Operator | Dec 1995 |
| 52 | Stonegate Operators, Inc. | Addison, TX 75001 | Oil Operator | Oct 2025 |
| 53 | Stout Consulting Services, Inc. | Alice, TX 78333 | Oil & Gas Operator | May 1999 |
| 54 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Oct 2025 |
| 55 | Sue-Ann Production Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 56 | Suemaur Expl. & Prod., LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jun 2024 |
| 57 | Suemaur Exploration, Inc. | Corpus Chrsti, TX 78470 | Oil & Gas Operator | Mar 2008 |
| 58 | Sulphur River Exploration, Inc. | Dallas, TX 75244 | Oil & Gas Operator | Oct 2025 |
| 59 | Sun Exploration, Inc. | Alice, TX 78332 | Oil & Gas Operator | Oct 2025 |
| 60 | Sutton Producing Corp. | San Antonio, TX 78270 | Oil & Gas Operator | Oct 2025 |
| 61 | Swope Corp. | Austin, TX 78735 | Oil & Gas Operator | Oct 2025 |
| 62 | Sydri Operating, LLC | Dallas, TX 75231 | Oil & Gas Operator | Oct 2025 |
| 63 | Synergy Oil & Gas, Inc. (A) | Houston, TX 77024 | Oil & Gas Operator | Aug 2001 |
| 64 | Synergy Production Company | Houston, TX 77024 | Oil & Gas Operator | Jan 1996 |