| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | S & C Oil Co. Inc. | Oil & Gas Operator | Mar 2024 | |
| 2 | Sage-California | Oil Operator | Dec 1988 | |
| 3 | Sampson Operators | Oil & Gas Operator | Mar 2024 | |
| 4 | Santa Fe Energy Operating Partners L.P. | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 5 | Say Energy Inc. | Oil & Gas Operator | Dec 2004 | |
| 6 | Security Pacific National Bank | Oil Operator | Dec 1990 | |
| 7 | Seneca Western Minerals Corp. | Oil & Gas Operator | Dec 2009 | |
| 8 | Sentinel Peak Resources California LLC | Oil & Gas Operator | Mar 2024 | |
| 9 | Shadow Wolf Energy LLC | Oil Operator | Mar 2024 | |
| 10 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 11 | Shirley M. Lechler | Oil & Gas Operator | Dec 2001 | |
| 12 | Signal Hill Petroleum Inc. | Oil & Gas Operator | Mar 2024 | |
| 13 | Southern California Gas Company | Oil & Gas Operator | Mar 2024 | |
| 14 | St. James Oil Corporation | Oil & Gas Operator | Dec 2009 | |
| 15 | Steven A. Sayce | Oil Operator | Jan 2021 | |
| 16 | Stinnett Oil Company | Oil Operator | Dec 1997 | |
| 17 | Storm Industries | Oil & Gas Operator | Dec 1988 | |
| 18 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |
| 19 | Synergy Oil & Gas LLC | Oil & Gas Operator | Feb 2024 |