| 1 | S & D Oil Company | | Oil & Gas Operator | Apr 2020 |
| 2 | Sabos George U | Tulsa, OK 74170 | Oil & Gas Operator | Jan 2013 |
| 3 | Sam W Mays Jr LLC | Eureka, KS 67045 | Oil & Gas Operator | Apr 2018 |
| 4 | Samuel Joe L | Tulsa, OK 74135-7805 | Oil & Gas Operator | Jan 2001 |
| 5 | Scott Wayne Oil Co | Haxton, CO 80731 | Oil & Gas Operator | Apr 2020 |
| 6 | Sellmeyer Frank | San Rafael, CA 94901-1339 | Oil Operator | Dec 2014 |
| 7 | Shallow Energy Inc | South Dennis, MA 2660 | Oil & Gas Operator | Feb 2025 |
| 8 | Shanks Drilling & Production Company LLC | Bixby, OK 74008 | Oil & Gas Operator | Aug 2025 |
| 9 | Shields Cooper | Bonita Springs, FL 34135-3421 | Oil & Gas Operator | Jan 2011 |
| 10 | Shoreline Operating LLC | Oklahoma City, OK 73113 | Oil & Gas Operator | Oct 2025 |
| 11 | Sitco Inc | Yukon, OK 73099 | Oil & Gas Operator | Jul 1995 |
| 12 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 13 | Slick Production Inc | Tulsa, OK 74132-1718 | Oil & Gas Operator | Apr 2020 |
| 14 | Smith Richard L | Catoosa, OK 74015 | Oil & Gas Operator | Dec 2019 |
| 15 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 16 | Southwest Exploration Company | Oklahoma City, OK 73132-2230 | Oil & Gas Operator | Jun 2017 |
| 17 | SP Energy Development Company | Seattle, WA 98101-3277 | Oil & Gas Operator | Mar 2015 |
| 18 | Startex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 19 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 20 | Stone Thomas R | Coweta, OK 74429-3293 | Oil & Gas Operator | Mar 2020 |
| 21 | Stricker Resources Inc | Morris, OK 74445 | Oil & Gas Operator | Sep 2025 |