| 1 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 2 | San Patricio Corporation | Dinero, TX 78350 | Oil & Gas Operator | Sep 2003 |
| 3 | Sandia Operating Corp. | San Antonio, TX 78270 | Oil & Gas Operator | May 2010 |
| 4 | Santa Rosa Operating, LLC | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Dec 2025 |
| 5 | Schroeder Oil Properties | Graham, TX 76450 | Oil & Gas Operator | Jul 2022 |
| 6 | Sea Eagle Ford, LLC | Denver, CO 80265 | Oil & Gas Operator | Jun 2022 |
| 7 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 8 | Sedco Resources Inc | Kerrville, TX 78029 | Oil & Gas Operator | Dec 2025 |
| 9 | Seeker Oil Company II, Inc. | San Antonio, TX 78209 | Oil Operator | Jan 2016 |
| 10 | Seeker Oil Company, Incorporated | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2025 |
| 11 | Serra Energy, Inc. | Hailey, ID 83333 | Oil & Gas Operator | May 2011 |
| 12 | Shale Hunter, LLC | Irving, TX 75039 | Oil & Gas Operator | Jan 2016 |
| 13 | Sharon Hunter Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Sep 2012 |
| 14 | SHWJ Oil & Gas Co., Inc. | Oil City, LA 71061 | Oil Operator | Dec 2025 |
| 15 | Sierra Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2008 |
| 16 | Silverbow Resources Oper, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 17 | Sisters Operating Company | Victoria, TX 77904 | Oil & Gas Operator | Nov 2010 |
| 18 | Skidmore Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Jul 1997 |
| 19 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 20 | Somex Energy Company | San Antonio, TX 78230 | Oil & Gas Operator | Mar 2002 |
| 21 | Sonat Exploration Co. - Houston | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 22 | Sonora Petroleum Corp. | Austin, TX 78734 | Oil & Gas Operator | Dec 2025 |
| 23 | South Texas Drilling & Expl, Inc | San Antonio, TX 78217 | Oil & Gas Operator | Jan 1999 |
| 24 | Southwest Loop 1604, LTD. | San Antonio, TX 78209 | Oil Operator | Sep 2022 |
| 25 | Spain Oil Company | Somerset, TX 78069 | Oil & Gas Operator | Dec 2025 |
| 26 | Spicewood Operating Company, LLC | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 27 | Spiller, Robert S. | San Antonio, TX 78213 | Oil & Gas Operator | Oct 1995 |
| 28 | Spur Operating Co. | Austin, TX 78701 | Oil & Gas Operator | Dec 2025 |
| 29 | Starr Operating Company | Austin, TX 78759 | Oil & Gas Operator | Dec 2025 |
| 30 | Stinger Oil & Gas Inc. | Sherman Oaks, CA 91403 | Oil & Gas Operator | Oct 2013 |
| 31 | Sto Operating Company | San Antonio, TX 78258 | Oil & Gas Operator | Dec 2025 |
| 32 | Stone, M. L. | Kerrville, TX 78029 | Oil & Gas Operator | Aug 2003 |
| 33 | Stoneburner Exploration, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Oct 1997 |
| 34 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 35 | Strata Star Petroleum Corp. | Uvalde, TX 78801 | Oil Operator | Dec 2025 |
| 36 | Stroube Energy Corporation | Dallas, TX 75248 | Oil & Gas Operator | Jan 2012 |
| 37 | Stubbs, J. W. | Suwanee, GA 30024 | Oil & Gas Operator | Mar 2008 |
| 38 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Dec 2025 |
| 39 | Syj Oil & Gas, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2025 |