| 1 | S & JB, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | Jul 2010 |
| 2 | S & S Energy | Englewood, CO 80112 | Oil & Gas Operator | Mar 2015 |
| 3 | S&JB, LLC | Rockdale, TX 76567 | Oil & Gas Operator | Oct 2025 |
| 4 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Oct 2025 |
| 5 | Sage Natural Resources LLC | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2025 |
| 6 | Salt Of The Earth Energy, LLC | Montgomery, TX 77356 | Oil & Gas Operator | Oct 2025 |
| 7 | San Antonio Gas & Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2000 |
| 8 | San Dia Producing Company | Deanville, TX 77852 | Oil & Gas Operator | Oct 2025 |
| 9 | Sandel Energy, Inc. | Huntsville, TX 77342 | Oil & Gas Operator | Apr 2004 |
| 10 | Sandel Operating Company | Huntsville, TX 77340 | Oil & Gas Operator | Oct 2025 |
| 11 | Saxet Exploration Ent. Co., Inc. | Fulshear, TX 77441 | Oil Operator | Oct 2025 |
| 12 | Scott Petroleum, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 1995 |
| 13 | Seaco Production | Dripping SPGS, TX 78620 | Oil & Gas Operator | Feb 2016 |
| 14 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 15 | Seay Oil & Gas, LTD. | Dripping SPGS, TX 78620 | Oil & Gas Operator | Apr 2013 |
| 16 | Seguro Well Service, Inc. | Gonzales, TX 78629 | Oil & Gas Operator | Oct 2025 |
| 17 | Sellers Lease Service, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | Oct 2025 |
| 18 | Senora Resources, Inc. | Dime Box, TX 77853 | Oil & Gas Operator | Oct 2025 |
| 19 | SFM Holdings, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 1995 |
| 20 | Sha-Jam Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 21 | Shale Hunter, LLC | Irving, TX 75039 | Oil & Gas Operator | Jan 2016 |
| 22 | Sharon Hunter Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Sep 2012 |
| 23 | Sharon Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Aug 2010 |
| 24 | Shield Petroleum | College Sta, TX 77845 | Oil & Gas Operator | Oct 2025 |
| 25 | Showdown Operating, Inc. | Dallas, TX 75230 | Oil & Gas Operator | May 1996 |
| 26 | Skytop Oil & Gas | Giddings, TX 78942 | Oil & Gas Operator | Oct 2025 |
| 27 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 28 | Smith Brothers Oil & Gas, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 29 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 30 | Sonoble Operating, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jun 2003 |
| 31 | South Forty Energy, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Oct 1993 |
| 32 | South Texas Drilling & Expl, Inc | San Antonio, TX 78217 | Oil & Gas Operator | Jan 1999 |
| 33 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 34 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 35 | Square One Corporation | Giddings, TX 78942 | Oil & Gas Operator | Dec 2012 |
| 36 | Stanton Mineral Development Inc | Austin, TX 78759 | Oil & Gas Operator | Oct 2025 |
| 37 | Sto Operating Company | San Antonio, TX 78258 | Oil & Gas Operator | Oct 2025 |
| 38 | Stroud Energy, LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2006 |
| 39 | Stroud Oil Properties, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2013 |
| 40 | Summit Exploration, L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2008 |
| 41 | Summit Resources MGMT., LLC. | Edmond, OK 73083 | Oil & Gas Operator | Oct 2025 |
| 42 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |