| 1 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 2 | Sanquip LLC | Oklahoma City, OK 73106 | Oil & Gas Operator | Sep 2024 |
| 3 | Scana Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 4 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 5 | Seals And Brown Oil Operating | Norman, OK 73072-3020 | Oil & Gas Operator | Sep 2024 |
| 6 | Seals Oil Company | Fox, OK 73435-0222 | Oil & Gas Operator | Nov 2011 |
| 7 | Seay Dennis Regan | | Oil Operator | Jan 2001 |
| 8 | Sharon Oil Company Inc | | Oil Operator | Aug 1997 |
| 9 | Sherry'S Oil Company | Terral, OK 73569 | Oil Operator | Oct 2000 |
| 10 | Signal Hill Expl & Pet Inc | Duncan, OK 73533 | Oil & Gas Operator | Mar 2015 |
| 11 | Skeet Oil Production LLC | Grady, OK 73569 | Oil Operator | Oct 2024 |
| 12 | Smart H D Etal | | Oil Operator | Jan 2006 |
| 13 | Smart Jr T J | Ryan, OK 73565 | Oil Operator | Sep 1994 |
| 14 | Smith Oil & Gas Co., Inc. | Wichita Falls, TX 76310 | Oil Operator | Dec 2010 |
| 15 | Smith W M | Barnstall, OK 74002 | Oil & Gas Operator | Sep 2024 |
| 16 | Southerland Marquieta Dba Keta Oil Company | Loco, OK 73442-1815 | Oil & Gas Operator | Sep 2024 |
| 17 | Southern Oklahoma Production | Wilson, OK 73463-6537 | Oil Operator | Sep 2024 |
| 18 | SRW Operating LLC | Duncan, OK 73534-2087 | Oil & Gas Operator | Sep 2014 |
| 19 | State Oil Company | | Oil & Gas Operator | Mar 2006 |
| 20 | Sullivan Wesley L | Duncan, OK 73533 | Oil & Gas Operator | Mar 2002 |
| 21 | Sunoco Partners MKT & Terminal | Tulsa, OK 74102-2039 | Oil & Gas Operator | Jan 2019 |
| 22 | Sweetwater Exploration LLC | Norman, OK 73069-5636 | Oil & Gas Operator | Sep 2024 |
| 23 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |