| 1 | Sallee Oil Corporation | Collinsville, OK 74021 | Oil & Gas Operator | Jun 2025 |
| 2 | Sand Boy Production Company | Bartlesville, OK 74003-9273 | Oil & Gas Operator | Jan 2025 |
| 3 | Schiff & Jackson Oil Producers | Dallas, TX 75206 | Oil & Gas Operator | Jun 2025 |
| 4 | Selby Larry Monroe | Bartlesville, OK 74006 | Oil & Gas Operator | Apr 2020 |
| 5 | Select Operating Company Inc | Dallas, TX 75225 | Oil & Gas Operator | Mar 2014 |
| 6 | Sellmeyer Eugene | Collinsville, OK 74021 | Oil & Gas Operator | Mar 2015 |
| 7 | Serendipity Operating LLC | Sparks, NV 89436-9328 | Oil & Gas Operator | May 2025 |
| 8 | Service Clearing Corp | Dallas, TX 75229 | Oil & Gas Operator | Oct 2025 |
| 9 | Sevitski & Associates Inc | Pryor, OK 74361 | Oil & Gas Operator | Dec 2000 |
| 10 | Shamrock Well Operations LLC | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Jun 2025 |
| 11 | Shannon Petroleum Inc | Tulsa, OK 74136-4603 | Oil & Gas Operator | Oct 2016 |
| 12 | Shertzer Charles F | Kilgore, TX 75662 | Oil Operator | Nov 2005 |
| 13 | Siosi Oil & Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2013 |
| 14 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 15 | SM Oil & Gas Inc | Skiatook, OK 74070 | Oil & Gas Operator | Jun 2025 |
| 16 | Smith Cheryl A | Copan, OK 74022 | Oil Operator | Jul 2024 |
| 17 | Smith Petroleum LLC | Barnsdall, OK 74002-0134 | Oil Operator | Jun 2025 |
| 18 | Southern Star Central Gas Pipeline, Inc. | Owensboro, KY 42301 | Oil & Gas Operator | May 2025 |
| 19 | Spencer Oil Company | Borger, TX 79007 | Oil & Gas Operator | Jun 2025 |
| 20 | Spencer Oil Company LLC | Bartlesville, OK 74006 | Oil Operator | Jan 2015 |
| 21 | Staats, William N | | Oil & Gas Operator | Jun 2025 |
| 22 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 23 | Stonegate Ranch LLC | Caney, KS 67333 | Oil Operator | Jun 2025 |
| 24 | Stratco, Inc. | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 25 | Superior Companies Inc | Bartlesville, OK 74003-2621 | Oil & Gas Operator | May 2013 |
| 26 | Swain Clinton Edward | Ochelata, OK 74051-2220 | Oil Operator | May 2025 |
| 27 | Swanson Douglas L & Sharon | Bartlesville, OK 74003-9319 | Oil Operator | Jun 2025 |
| 28 | Swenton, Michael J. | Tulsa, OK 74105 | Oil & Gas Operator | Jun 2025 |