| 1 | Sabine Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Jul 1996 |
| 2 | Sabine Productio | | Oil & Gas Operator | Mar 1994 |
| 3 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 4 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 5 | Samuel Gary Jr. & Associates, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 6 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2025 |
| 7 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 8 | SH Oil Operations LLC | Wichita, KS 67277 | Oil & Gas Operator | Jun 2025 |
| 9 | Shaw George R | | Oil & Gas Operator | Mar 1992 |
| 10 | Sho-Bar Energy I | | Oil & Gas Operator | Jan 1991 |
| 11 | Sho-Bar Energy, Inc. | Harper, KS 67058 | Oil & Gas Operator | May 2025 |
| 12 | Sidwell Oil & Ga | | Oil & Gas Operator | May 1993 |
| 13 | Sidwell Oil & Gas, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2014 |
| 14 | Siegfried R H In | | Oil Operator | Apr 1985 |
| 15 | Sierra Petroleum | | Oil & Gas Operator | Sep 1986 |
| 16 | Snyder Partners, General Partnership | Cody, WY 82414 | Oil & Gas Operator | Jul 2019 |
| 17 | South Forty, The, Inc. | Laverne, OK 73848 | Oil & Gas Operator | Mar 2015 |
| 18 | Southwest Gas St | | Oil & Gas Operator | Dec 1981 |
| 19 | Southwest Gas Storage Company | | Gas Operator | Jun 2025 |
| 20 | Special Energy Corporation | Stillwater, OK 74076 | Oil & Gas Operator | Oct 2025 |
| 21 | Spess Oil Company, A General Partnership | Cleveland, OK 74020 | Oil & Gas Operator | Jun 2025 |
| 22 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 23 | Sunfire Energy | | Oil & Gas Operator | Jun 2025 |
| 24 | SW Gas Stge | | Gas Operator | Oct 2015 |