| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | S & S Oil Company | Electra, TX 76360 | Oil & Gas Operator | Feb 2026 |
| 3 | S & S Operating Company, Inc. | Winnie, TX 77665 | Oil & Gas Operator | Feb 2026 |
| 4 | S Enterprises | | Oil & Gas Operator | Nov 1986 |
| 5 | S G L B Operating Company Inc | | Oil & Gas Operator | Nov 1993 |
| 6 | S M Hammack | | Gas Operator | Feb 2003 |
| 7 | S S M Partnership | | Oil & Gas Operator | Jul 1992 |
| 8 | S&B Petroleum Corporation | | Oil & Gas Operator | Jun 1994 |
| 9 | S&S Williams Inc | | Oil Operator | May 2004 |
| 10 | S. G. Myers, Jr. | | Oil & Gas Operator | May 2005 |
| 11 | S. G. Myers, Jr. Et Al | | Oil & Gas Operator | Jul 1991 |
| 12 | S. Parish Oil Company, Inc. | | Oil & Gas Operator | Dec 1997 |
| 13 | S. S. Tatum | | Oil Operator | Aug 1999 |
| 14 | S. W. Ray, Et Al | | Oil Operator | Mar 2003 |
| 15 | S.H. Loe Oil Corp. | | Oil & Gas Operator | Jan 2025 |
| 16 | S2 Energy 1, LP | | Oil & Gas Operator | Nov 2012 |
| 17 | S2 Energy Operating LLC | | Oil & Gas Operator | May 2023 |
| 18 | Saba Energy Of Texas Inc | Houston, TX 77042 | Oil & Gas Operator | Jul 2007 |
| 19 | Sabine Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Jul 1996 |
| 20 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 21 | Sabine Oil & Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 22 | Sabine Pipe & Supply Co. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2004 |
| 23 | Sabine Pipe, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 24 | Sable Minerals, Inc. | | Oil & Gas Operator | Nov 1993 |
| 25 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 26 | Sackett Oil Company | | Oil & Gas Operator | Oct 1995 |
| 27 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Feb 2026 |
| 28 | Sahara Gas & Exploration, Inc. | | Gas Operator | Mar 2002 |
| 29 | Saline Injection Systems Co. | | Oil Operator | Jan 2025 |
| 30 | Sally Oil Company | | Oil Operator | Sep 2016 |
| 31 | Sam Aertker | | Oil Operator | Jul 1992 |
| 32 | Sam Jones & Assoc Prod Div Inc | | Oil & Gas Operator | Feb 1999 |
| 33 | Sam Myers | | Oil & Gas Operator | Nov 1988 |
| 34 | Sam R. Brown | | Oil Operator | Mar 1987 |
| 35 | Sam Spears, Jr. | | Oil & Gas Operator | Sep 1998 |
| 36 | Samantha Petroleum Corp. | | Oil & Gas Operator | Apr 1987 |
| 37 | Samedan Oil Corp. Et Al | | Oil & Gas Operator | Jan 1989 |
| 38 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 39 | Sammy D. Thrash | | Oil & Gas Operator | May 2012 |
| 40 | Sammy D. Thrash, LLC | | Oil & Gas Operator | May 2019 |
| 41 | Sample Exploration | | Oil & Gas Operator | Jul 2002 |
| 42 | Samson Contour Energy E&P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2017 |
| 43 | Samson Exploration LLC | Tulsa, OK 74101 | Oil & Gas Operator | Dec 2025 |
| 44 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 45 | Samson Kelley Operating Co., LTD. | | Oil & Gas Operator | Feb 2004 |
| 46 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 47 | Samuel Gary Jr. & Assoc., Inc. | | Oil & Gas Operator | Mar 2023 |
| 48 | San Miguel Oil & Gas, Inc. | | Oil & Gas Operator | Jan 1993 |
| 49 | Sananco Energy Corp | Naples, FL 33941 | Oil & Gas Operator | Jul 2013 |
| 50 | Sanare Energy Partners, LLC | | Oil & Gas Operator | Dec 2024 |
| 51 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 52 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 53 | Sand Hill, LTD. | | Gas Operator | Dec 2024 |
| 54 | Sandalwood Exploration, L.P. | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 55 | Sandefer & Andress, Inc. | | Oil & Gas Operator | Apr 1982 |
| 56 | Sandefer Petroleum Co. | | Oil & Gas Operator | Apr 1994 |
| 57 | Sandel Energy, Inc. | Huntsville, TX 77342 | Oil & Gas Operator | Apr 2004 |
| 58 | Sandhill Production Inc | Shongaloo, LA 71072 | Oil & Gas Operator | Dec 2019 |
| 59 | Sandpoint Energy Partners LLC | | Oil Operator | Jan 2025 |
| 60 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Feb 2026 |
| 61 | Sandridge Onshore, LLC | Houston, TX 77010 | Oil & Gas Operator | Jun 2014 |
| 62 | Santa Fe Braun Inc | Dallas, TX 75240-6620 | Oil & Gas Operator | Mar 1995 |
| 63 | Santa Fe Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 64 | Santa Fe Energy Operg Parts LP | | Oil & Gas Operator | Nov 1993 |
| 65 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 66 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 67 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 68 | Santa Fe-Andover Oil Co | Tulsa, OK 74172 | Oil & Gas Operator | Sep 2000 |
| 69 | Santana Exploration, Inc. | | Oil & Gas Operator | Dec 1985 |
| 70 | Sante Fe Minerals | | Oil & Gas Operator | Dec 1987 |
| 71 | Santo Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 72 | Santos USA Corp. | Houston, TX 77042 | Oil & Gas Operator | Dec 2008 |
| 73 | Sapient Energy Corp | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2002 |
| 74 | Sasha Petroleum, Inc | | Oil Operator | Jan 1986 |
| 75 | Savant Energy Corporation | | Oil & Gas Operator | Mar 2012 |
| 76 | Sawyer Drilling & Service Inc. | | Oil & Gas Operator | Oct 2004 |
| 77 | Sawyer Energy, Inc. | | Oil & Gas Operator | May 1997 |
| 78 | Saxon Oil & Gas Expl., Inc. | | Gas Operator | Nov 1989 |
| 79 | Saxon Oil Company | Dallas, TX 75204 | Oil & Gas Operator | Oct 2009 |
| 80 | Saye Petroleum, Inc. | | Oil & Gas Operator | Apr 1995 |
| 81 | Sayes Drilling Inc. | | Oil Operator | May 1987 |
| 82 | SBM Operating Company Inc. | | Gas Operator | Sep 1997 |
| 83 | Scana Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 84 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 85 | Sceptre Resources Inc | | Oil & Gas Operator | Dec 2007 |
| 86 | Schmid Properties, Inc. | Hico, TX 76457 | Oil & Gas Operator | Feb 2026 |
| 87 | Scogin Exploration Inc | | Oil & Gas Operator | Dec 1999 |
| 88 | Scorpion Oil & Gas, LLC | Houston, TX 77036 | Oil & Gas Operator | May 2025 |
| 89 | Scott W. Brumley | | Oil Operator | Apr 2011 |
| 90 | Scurlock Oil Co | | Oil Operator | May 1982 |
| 91 | SDG Services LLC | Kilgore, TX 75663 | Oil Operator | Sep 2025 |
| 92 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 93 | Seaboard Pipe & Equip. Co. | | Oil & Gas Operator | May 1977 |
| 94 | Seaboard Well Service, Inc. | | Oil & Gas Operator | Jan 1978 |
| 95 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 96 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 97 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 98 | Seahawk Oil & Gas Company | Dallas, TX 75379 | Oil & Gas Operator | Aug 2007 |
| 99 | Seal Energy Company | | Oil Operator | Dec 2024 |
| 100 | Sealexco | | Oil & Gas Operator | Jun 1992 |