| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2026 |
| 3 | Sajac Energy Company LLC | Duncan, OK 73533 | Oil & Gas Operator | May 2026 |
| 4 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 5 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 6 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2026 |
| 7 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Jul 2026 |
| 8 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jul 2026 |
| 9 | Sanook Inc | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Jan 2007 |
| 10 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 11 | Sarkeys Inc | | Oil & Gas Operator | Dec 1998 |
| 12 | Scissortail Exploration & Production, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2026 |
| 13 | Scout Energy Corporation | Edmond, OK 73083-1348 | Oil & Gas Operator | Apr 2026 |
| 14 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Jul 2026 |
| 15 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 16 | Seals And Brown Oil Operating | Norman, OK 73072-3020 | Oil & Gas Operator | Sep 2024 |
| 17 | Seals Oil Company | Fox, OK 73435-0222 | Oil & Gas Operator | Nov 2011 |
| 18 | Sean M Sharp LLC | Chalk Hill, PA 15421 | Oil & Gas Operator | Oct 2025 |
| 19 | Shadowpeak Operating LLC | Oklahoma City, OK 73159-6905 | Oil & Gas Operator | Apr 2026 |
| 20 | Shanks Drilling & Production Company LLC | Bixby, OK 74008 | Oil & Gas Operator | May 2026 |
| 21 | Shell Western Expl & Prod Inc | Houston, TX 77251 | Oil & Gas Operator | Mar 2015 |
| 22 | Sikes Oil Company Inc | Velma, OK 73091-0759 | Oil & Gas Operator | Jan 2014 |
| 23 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Jul 2026 |
| 24 | Simmons, L.B. Energy, Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 2000 |
| 25 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 26 | Slawson Clifford Ray | Healdton, OK 73438 | Oil Operator | Jan 1995 |
| 27 | Smith C W & Associates Inc | Oklahoma City, OK 73178-0105 | Oil & Gas Operator | Aug 2013 |
| 28 | Smith Energy Company LLC | Purcell, OK 73080-4772 | Oil & Gas Operator | May 2015 |
| 29 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 30 | Sonata Oil & Gas Corp Inc | Stratford, OK 74812 | Oil & Gas Operator | Apr 2014 |
| 31 | Sooner Exploration & Development Co Inc | Enid, OK 73702-3525 | Oil & Gas Operator | Oct 2023 |
| 32 | Sooner Oilfield Services Inc | Piedmont, OK 73078-0810 | Oil & Gas Operator | May 2024 |
| 33 | Southerland Joe Don Dba Taylor Oil Co | Duncan, OK 73533 | Oil & Gas Operator | Apr 2026 |
| 34 | Southerland Marquieta Dba Keta Oil Company | Loco, OK 73442 | Oil & Gas Operator | Apr 2026 |
| 35 | Southern Oklahoma Production | Wilson, OK 73463-6537 | Oil & Gas Operator | May 2026 |
| 36 | Southern Star Central Gas Pipeline Inc | Owensboro, KY 42301 | Oil & Gas Operator | Mar 2026 |
| 37 | Southwestern Exploration Consultants Inc | Oklahoma City, OK 73118-1116 | Oil & Gas Operator | May 2026 |
| 38 | Sparks Resources Inc | Bristow, OK 74010 | Oil & Gas Operator | May 2026 |
| 39 | Spectrum Field Services Inc | Tulsa, OK 74136-3400 | Oil & Gas Operator | Jan 2004 |
| 40 | Speller Oil Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Apr 2026 |
| 41 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | May 2026 |
| 42 | Spring Operating Company | Edmond, OK 73034 | Oil & Gas Operator | May 2026 |
| 43 | Spruiell Drilling Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Jul 2026 |
| 44 | SSB Production LC | Ardmore, OK 73401 | Oil & Gas Operator | Apr 2026 |
| 45 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2026 |
| 46 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |
| 47 | Star Oil Company | Wichita, KS 67230 | Oil & Gas Operator | Mar 2025 |
| 48 | Star Resources LLC | Englewood, CO 80155-5185 | Oil & Gas Operator | Dec 2013 |
| 49 | State Oil Company | | Oil & Gas Operator | Mar 2006 |
| 50 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2026 |
| 51 | Stewart Inc | Ringling, OK 73456 | Oil & Gas Operator | May 2026 |
| 52 | Strike Energy Corp | Blackwell, OK 74631 | Oil & Gas Operator | Jul 2023 |
| 53 | Strike Energy LLC | Ardmore, OK 73401 | Oil Operator | Apr 2026 |
| 54 | Sullivan Jesse G | Duncan, OK 73533 | Oil Operator | May 1998 |
| 55 | Sullivan Nora M | Oklahoma City, OK 73139 | Oil Operator | Jan 1997 |
| 56 | Sullivan Wesley L | Duncan, OK 73533 | Oil & Gas Operator | Mar 2002 |
| 57 | Summa Engineering Inc | Oklahoma City, OK 73112-3624 | Oil & Gas Operator | Mar 2015 |
| 58 | Sunterra Energy Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2009 |
| 59 | Superior Oil & Gas LLC | Ringwood, OK 73768-9658 | Oil & Gas Operator | May 2026 |
| 60 | Sweetwater Exploration LLC | Norman, OK 73069-5636 | Oil & Gas Operator | Apr 2026 |
| 61 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |