| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | S & K Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jul 1994 |
| 3 | S & W Engine Supply | Oklahoma City, OK 73107 | Oil Operator | Jun 2003 |
| 4 | S/H Petroleum Corporation | Hennessey, OK 73742-0477 | Oil & Gas Operator | Feb 2016 |
| 5 | Salt Creek Energy Company LLC | Shawnee, OK 74802-1505 | Oil & Gas Operator | Feb 2025 |
| 6 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 7 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 8 | Sandy Petroleum Inc | Shawnee, OK 74801-5634 | Oil & Gas Operator | Nov 2024 |
| 9 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jun 2025 |
| 10 | Sanook Inc | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Jan 2007 |
| 11 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 12 | Saqus Oil Co | Oklahoma City, OK 73107 | Oil & Gas Operator | May 2001 |
| 13 | Sasakwa Operating LLC | Oklahoma City, OK 73179-1902 | Oil & Gas Operator | Feb 2025 |
| 14 | Schiff & Jackson Oil Producers | Dallas, TX 75206 | Oil & Gas Operator | Feb 2025 |
| 15 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 16 | Scissortail Energy LLC | Tulsa, OK 74137-3644 | Oil & Gas Operator | Feb 2015 |
| 17 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 18 | Seaport Inc | Oklahoma City, OK 73131 | Oil & Gas Operator | Feb 2025 |
| 19 | Sellers Jack B Estate Of | Cleveland, OK 74020 | Oil & Gas Operator | Feb 2025 |
| 20 | Seminole Company (The) | | Oil Operator | Dec 1994 |
| 21 | Seminole Tank Service | Seminole, OK 74818-1587 | Oil & Gas Operator | Feb 2025 |
| 22 | Sentinel Petroleum Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2020 |
| 23 | Shannon Petroleum Inc | Tulsa, OK 74136-4603 | Oil & Gas Operator | Oct 2016 |
| 24 | Sharber Billy Jack Operating | Konawa, OK 74849-0071 | Oil & Gas Operator | Mar 2015 |
| 25 | Sharber Don E | Okemah, OK 74859-0322 | Oil Operator | Dec 2018 |
| 26 | Sharber Production Inc | Konawa, OK 74849 | Oil & Gas Operator | Dec 2024 |
| 27 | Sharp Anthony G | Shawnee, OK 74802-1701 | Oil & Gas Operator | Jul 2003 |
| 28 | Signature Exploration Inc. | Shawnee, OK 74804-4130 | Oil & Gas Operator | Mar 2015 |
| 29 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Jun 2025 |
| 30 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Feb 2025 |
| 31 | Simco Operating | Shawnee, OK 74804-2501 | Oil Operator | Jan 2013 |
| 32 | Simon Royce & Joyce | Tecumseh, OK 74873-7341 | Oil Operator | Jun 2018 |
| 33 | Singer Oil Co LLC | Hennessey, OK 73742 | Oil & Gas Operator | Mar 2025 |
| 34 | Singer Oil Company | Oklahoma City, OK 73148 | Oil & Gas Operator | Feb 2025 |
| 35 | Siosi Oil & Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2013 |
| 36 | Smith Brothers Enterprises | Ardmore, OK 73402 | Oil Operator | Jul 1998 |
| 37 | Smith Manus L MFG Inc | Oklahoma City, OK 73147 | Oil & Gas Operator | Nov 1998 |
| 38 | Smith Max Dean | Wewoka, OK 74884 | Oil & Gas Operator | Dec 2024 |
| 39 | SNR Central Oklahoma Operating LLC | Oklahoma City, OK 73116-7906 | Oil Operator | Mar 2025 |
| 40 | SNR Operating, LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Jun 2025 |
| 41 | Snuffy'S Oilfield Service Inc | Hennessey, OK 73742-6511 | Oil & Gas Operator | Nov 2014 |
| 42 | Sooner Drilling Inc | Shawnee, OK 74802-0037 | Oil & Gas Operator | Jan 2005 |
| 43 | Sooner Pipe & Supply Corp | | Oil & Gas Operator | Nov 2004 |
| 44 | Southland Energy Corporation | Houston, TX 77060 | Oil & Gas Operator | Aug 2022 |
| 45 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 46 | SP Energy Development Company | Seattle, WA 98101-3277 | Oil & Gas Operator | Mar 2015 |
| 47 | Special Energy Corporation | Stillwater, OK 74076 | Oil & Gas Operator | Jun 2025 |
| 48 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Mar 2025 |
| 49 | Splawn & Splawn | Saint Louis, OK 74866-0098 | Oil & Gas Operator | Mar 2025 |
| 50 | Stacy Operating LLC | Cushing, OK 74023 | Oil & Gas Operator | Feb 2025 |
| 51 | Staghorn Petroleum II LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Mar 2025 |
| 52 | Stalnaker Oil Company | Maud, OK 74854-0295 | Oil Operator | May 2017 |
| 53 | Stark Oil Properties | Asher, OK 74826 | Oil & Gas Operator | Jan 1997 |
| 54 | Sterling Oil Of Okla Inc | Tulsa, OK 74170-2163 | Oil & Gas Operator | Nov 2006 |
| 55 | Stobaugh G B Trust | Oklahoma City, OK 73124 | Oil Operator | Dec 2024 |
| 56 | Stover Company | Tulsa, OK 74152-0786 | Oil & Gas Operator | Jan 2013 |
| 57 | STP Cherokee, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2014 |
| 58 | STP Newco Inc | Oklahoma City, OK 73102-5641 | Oil & Gas Operator | Jul 2021 |
| 59 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 60 | Stream Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 61 | Streamline Oil And Gas Inc | Lindsey, OK 73052 | Oil & Gas Operator | Mar 2025 |
| 62 | Striker Management Co LLC | Shawnee, OK 74801 | Oil & Gas Operator | Feb 2025 |
| 63 | Sullivan & Co. | Tulsa, OK 74114 | Oil & Gas Operator | May 2022 |
| 64 | Sullivan And Company LLC | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2025 |
| 65 | Summit Resources Management LLC | Edmond, OK 73083 | Oil & Gas Operator | Jan 2025 |
| 66 | Superior Production MGMT Inc | Calumet, OK 73014 | Oil & Gas Operator | Mar 2015 |
| 67 | Swadley Roy W & Judith I | Holdenville, OK 74848-0794 | Oil & Gas Operator | Mar 2015 |
| 68 | Synergex Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2025 |