| 1 | S & C Oil Co. Inc. | | Oil & Gas Operator | Dec 2025 |
| 2 | S & D Energy Associates Inc. | | Gas Operator | Dec 1986 |
| 3 | S & S Oil Company LLC | | Oil Operator | Dec 2025 |
| 4 | S. A. Camp Companies | | Oil & Gas Operator | Dec 1998 |
| 5 | S. H. Montgomery | | Oil & Gas Operator | Dec 1996 |
| 6 | S. M. Reynolds Opr. | | Gas Operator | Dec 1990 |
| 7 | Saba Petroleum Inc. | | Oil & Gas Operator | Mar 2006 |
| 8 | Sacramento Energy Inc. | | Oil & Gas Operator | Dec 2025 |
| 9 | Sacramento Oil & Gas Co. | | Gas Operator | Dec 2003 |
| 10 | Sage-California | | Oil Operator | Dec 1988 |
| 11 | Sampson Operators | | Oil & Gas Operator | Dec 2025 |
| 12 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 13 | San Carlos Oil & Gas Corp. | | Gas Operator | Dec 2003 |
| 14 | San Joaquin Facilities Management Inc. | | Oil & Gas Operator | Dec 2025 |
| 15 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 16 | Santa Fe Energy Operating Partners L P | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 17 | Santa Fe Minerals | | Gas Operator | Dec 1993 |
| 18 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 19 | Santa Maria Energy LLC | | Oil & Gas Operator | Dec 2024 |
| 20 | Say Energy Inc. | | Oil & Gas Operator | Dec 2004 |
| 21 | Seaward Resources Inc. | | Gas Operator | Dec 1984 |
| 22 | Second Wind Production Company Inc. | | Oil Operator | Dec 2013 |
| 23 | Security Pacific National Bank | | Oil Operator | Dec 1990 |
| 24 | Seneca Resources Co LLC | Cranberry Township, PA 16066 | Oil & Gas Operator | Jan 2026 |
| 25 | Seneca Western Minerals Corp. | | Oil & Gas Operator | Dec 2009 |
| 26 | Sentinel Peak Resources California LLC | | Oil & Gas Operator | Dec 2025 |
| 27 | Sequoia Exploration Inc. | | Oil & Gas Operator | Dec 2025 |
| 28 | Shadow Wolf Energy LLC | | Oil Operator | Dec 2025 |
| 29 | Shell Calif. Prod. Inc. | | Oil Operator | Dec 1980 |
| 30 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 31 | Shelly Energy Inc | Berwyn, PA 19312 | Oil & Gas Operator | Jan 2026 |
| 32 | Sherman Havens | | Oil & Gas Operator | Dec 2025 |
| 33 | Shirley M. Lechler | | Oil & Gas Operator | Dec 2001 |
| 34 | Shoshone Oil Corp. | | Oil & Gas Operator | Dec 2005 |
| 35 | Sierra Reserve Company | | Oil Operator | Dec 1985 |
| 36 | Sierra Resources, Inc. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2025 |
| 37 | Signal Hill Petroleum Inc. | | Oil & Gas Operator | Dec 2025 |
| 38 | Silver Exploration Company | | Oil & Gas Operator | Dec 2025 |
| 39 | SJM Oil LLC | | Oil & Gas Operator | Dec 2009 |
| 40 | SM&O LLC | | Oil & Gas Operator | Dec 2025 |
| 41 | Soc Resources Inc. | | Oil & Gas Operator | Dec 2024 |
| 42 | Sojitz Energy Venture, Inc. | Houston, TX 77042 | Oil & Gas Operator | Feb 2018 |
| 43 | Solimar Energy LLC | | Oil & Gas Operator | Dec 2025 |
| 44 | Source Energy Corp. | | Gas Operator | Aug 2022 |
| 45 | South Coast Oil Corporation | Boulder, CO 80302 | Oil & Gas Operator | Oct 2015 |
| 46 | South Fork Ranch | | Oil & Gas Operator | Feb 2013 |
| 47 | Southern California Gas Company | | Oil & Gas Operator | Dec 2025 |
| 48 | Southridge Homes | | Oil & Gas Operator | Dec 1999 |
| 49 | St. James Oil Corporation | | Oil & Gas Operator | Dec 2009 |
| 50 | Standing Bear Petroleum Inc. | | Oil & Gas Operator | Dec 2005 |
| 51 | State Lands Commission | | Oil & Gas Operator | Dec 2025 |
| 52 | Stephen W. Bradford | | Oil Operator | Dec 1996 |
| 53 | Steve Smith | | Gas Operator | Dec 1987 |
| 54 | Steven A. Sayce | | Oil Operator | Jan 2021 |
| 55 | Stinnett Oil Company | | Oil Operator | Dec 1997 |
| 56 | Stockdale Energy Co. | | Gas Operator | Dec 1992 |
| 57 | Stockdale Oil & Gas Inc. | | Oil & Gas Operator | Dec 2001 |
| 58 | Stone Cabin Resources LLC | | Oil & Gas Operator | Dec 2025 |
| 59 | Storm Industries | | Oil & Gas Operator | Dec 1988 |
| 60 | Stowe Killingsworth | | Oil & Gas Operator | Apr 2023 |
| 61 | Strata-X Inc. | | Oil & Gas Operator | Dec 2025 |
| 62 | Stream Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 63 | Summit Energy LLC | | Oil & Gas Operator | Dec 2025 |
| 64 | Summit Exploration (California) LLC | | Oil & Gas Operator | Feb 2018 |
| 65 | Sumpf-Williams | | Gas Operator | Dec 1980 |
| 66 | Sun Mountain Oil & Gas | | Oil & Gas Operator | Dec 2020 |
| 67 | Sunray Petroleum Inc. | | Oil & Gas Operator | Dec 2025 |
| 68 | Sunset Exploration Inc. | | Oil & Gas Operator | Dec 2025 |
| 69 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |
| 70 | Superior Well Service Inc. | | Oil & Gas Operator | Sep 2007 |
| 71 | Sycamore Development Partners LLC | | Oil & Gas Operator | Dec 2025 |
| 72 | Synergy Oil & Gas LLC | | Oil & Gas Operator | Dec 2025 |
| 73 | Synergy Resources | Artesia, NM 88210 | Oil & Gas Operator | Jan 2015 |