| 1 | S & M Oil - Craw | | Oil Operator | Dec 1995 |
| 2 | S & S Oil | Ponca City, OK 74601 | Oil & Gas Operator | Dec 2009 |
| 3 | S & W Oil Compan | | Oil Operator | Dec 1986 |
| 4 | S.B. Oil Company, A General Partnership | Hays, KS 67601 | Oil Operator | Sep 2019 |
| 5 | Sabre Exploratio | | Oil Operator | Oct 1988 |
| 6 | Samson Resources | | Oil Operator | Jan 1994 |
| 7 | Samuel Gary Jr. & Associates, Inc. | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 8 | Sandlin Oil Corp | Dacono, CO 80514 | Oil & Gas Operator | Mar 2026 |
| 9 | Saxon Oil Company | Dallas, TX 75204 | Oil & Gas Operator | Oct 2009 |
| 10 | Scheck Oil Operation | | Oil & Gas Operator | Feb 2026 |
| 11 | Schlobohm Starr | | Oil Operator | Dec 1996 |
| 12 | Schlobohm, Starr F. | Wolfeboro, NH 03894 | Oil Operator | Jul 2004 |
| 13 | Schmeid Ranch, LLC | Hays, KS 67601 | Oil Operator | Jun 2024 |
| 14 | Schmitt Carmen I | | Oil Operator | Dec 1996 |
| 15 | Schneltz Oil Com | | Oil Operator | May 1992 |
| 16 | Scott Services LLC | Plainville, KS 67663 | Oil Operator | Feb 2026 |
| 17 | Shaida, John H. | Wichita, KS 67226 | Oil & Gas Operator | Jun 2026 |
| 18 | Shelby Resources LLC | Denver, CO 80207 | Oil & Gas Operator | Feb 2026 |
| 19 | Shields Oil Prod | | Oil & Gas Operator | Aug 1995 |
| 20 | Shields Oil Producers Inc. | Russell, KS 67665 | Oil Operator | Feb 2026 |
| 21 | Sierra Drilling | | Oil Operator | Sep 1988 |
| 22 | Slawson Donald C | Wichita, KS 67202 | Oil & Gas Operator | Oct 2025 |
| 23 | SMG Resources LLC | | Oil & Gas Operator | Feb 2026 |
| 24 | Smith Todd W Oil | | Oil Operator | Jan 1994 |
| 25 | Source Petroleum | Wichita, KS 67202 | Oil & Gas Operator | Oct 1993 |
| 26 | Southern States | | Oil & Gas Operator | Jul 1988 |
| 27 | Spiral Energy Corp. | Midland, TX 79705 | Oil & Gas Operator | Dec 2019 |
| 28 | Staab Oil Co., A General Partnership | Hays, KS 67601 | Oil Operator | Feb 2026 |
| 29 | Star Oil Company | Wichita, KS 67230 | Oil & Gas Operator | Mar 2025 |
| 30 | Star Resources, LTD. | Wichita, KS 67202 | Oil Operator | Nov 2002 |
| 31 | Stecklein Oil Co | | Oil Operator | Jul 1993 |
| 32 | Stecklein Oil Company, A General Partnership | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 33 | Sterling Petrole | | Oil & Gas Operator | Sep 1992 |
| 34 | Stratakan Exploration, LLC | Plainville, KS 67663 | Oil & Gas Operator | Feb 2026 |
| 35 | Stull Crude Co, LLC | | Oil Operator | Feb 2026 |
| 36 | Stull Oil LLC | Natoma, KS 67651 | Oil Operator | Feb 2026 |
| 37 | Super Oilwell Service | Russell, KS 67665 | Oil Operator | Dec 2025 |