| 1 | S. G. Myers, Jr. | | Oil & Gas Operator | May 2005 |
| 2 | Sabine Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Jul 1996 |
| 3 | Sammy D. Thrash | | Oil & Gas Operator | May 2012 |
| 4 | Sammy D. Thrash, LLC | | Oil & Gas Operator | May 2019 |
| 5 | Sample Exploration | | Oil & Gas Operator | Jul 2002 |
| 6 | Samson Contour Energy E&P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2017 |
| 7 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 8 | San Miguel Oil & Gas, Inc. | | Oil & Gas Operator | Jan 1993 |
| 9 | Sandhill Production Inc | Shongaloo, LA 71072 | Oil & Gas Operator | Dec 2019 |
| 10 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 11 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 12 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 13 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 14 | Shaw-Laird, LLC | | Oil & Gas Operator | Jan 2017 |
| 15 | Shell Oil Co. | Houston, TX 77001 | Oil & Gas Operator | Jun 1985 |
| 16 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 17 | Shenandoah Oil Corporation | | Oil & Gas Operator | Jun 1979 |
| 18 | Shuler Drilling Co., Inc. | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2025 |
| 19 | Shuler DRLG Co &Roy Guffey Oil | | Oil & Gas Operator | Sep 1992 |
| 20 | Simmons Oil Corp | | Oil Operator | Jan 1989 |
| 21 | Simpson Well Service, Inc. | | Oil Operator | Dec 1996 |
| 22 | Skinner Energy Management, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Jan 2011 |
| 23 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 24 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2026 |
| 25 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Feb 2026 |
| 26 | Smackover Drilling Co. Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jan 2025 |
| 27 | Smith Operating And MGMT Co. | Shreveport, LA 71161 | Oil & Gas Operator | Jun 2023 |
| 28 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 29 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 30 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 31 | Southern Management Services | | Oil Operator | May 2017 |
| 32 | Southern Star Operating, Inc. | | Oil & Gas Operator | Jun 2010 |
| 33 | Southwest Operating Inc. | | Oil & Gas Operator | Dec 2024 |
| 34 | Southwestern Electric Power Co | Dallas, TX 75266 | Oil & Gas Operator | Dec 1989 |
| 35 | Special Energy Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Feb 2026 |
| 36 | Spicy Daugx Operators Louisiana LLC | | Oil & Gas Operator | Nov 2024 |
| 37 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 38 | Story Oil And Gas Inc | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 39 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | Feb 2026 |
| 40 | Suburban Propane Expl Co, Inc. | | Oil & Gas Operator | Jun 1983 |
| 41 | Suburban Propane Gas Corp. | | Oil & Gas Operator | Sep 1980 |
| 42 | Sugar Creek Producing Company | | Oil & Gas Operator | Dec 2010 |
| 43 | Sugar Creek Producing Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 44 | Summit Energy,Inc | Littleton, CO 80127 | Oil & Gas Operator | Aug 2013 |
| 45 | Summit Gas LLC | | Oil & Gas Operator | Oct 2011 |
| 46 | Sun Exploration And Production Co | | Oil & Gas Operator | Jan 1990 |
| 47 | Sundance Energy Corporation | | Oil & Gas Operator | Jan 2025 |
| 48 | Sunland Production Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 49 | Swan Lake Properties, Inc. | | Oil Operator | Jul 1987 |
| 50 | SWN Production (Louisiana), LLC | | Oil & Gas Operator | Dec 2024 |