| 1 | S & G Operating LLC | McLoud, OK 74851 | Oil & Gas Operator | Jul 2025 |
| 2 | S O S Recovery Inc | Enid, OK 73703-2403 | Oil & Gas Operator | Jul 2023 |
| 3 | S T Industries Inc | Drumright, OK 74030 | Oil & Gas Operator | Mar 2011 |
| 4 | Salt Fork Producers Inc | Pond Creek, OK 73766 | Oil & Gas Operator | Jan 1995 |
| 5 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 6 | Sand Point Production Inc | Oklahoma City, OK 73172 | Oil & Gas Operator | Jun 2025 |
| 7 | Sandridge Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2018 |
| 8 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Oct 2025 |
| 9 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 10 | Sensor Oil & Gas Inc | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 11 | Service Drilling Co. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1998 |
| 12 | Shaw Thomas P | Tulsa, OK 74105-7327 | Oil & Gas Operator | Mar 2015 |
| 13 | Silberman A & M Oil | Oklahoma City, OK 73122-3096 | Oil & Gas Operator | Apr 2014 |
| 14 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | May 2025 |
| 15 | Singer Oil Co LLC | Hennessey, OK 73742 | Oil & Gas Operator | Jul 2025 |
| 16 | Singer Oil Company | Oklahoma City, OK 73148 | Oil & Gas Operator | May 2025 |
| 17 | SK Plymouth LLC | Houston, TX 77079-1222 | Oil & Gas Operator | Jun 2025 |
| 18 | Sloan Petroleum Service Inc | Guthrie, OK 73044 | Oil & Gas Operator | Jul 2025 |
| 19 | SNR Operating, LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Oct 2025 |
| 20 | Southern Resources Inc | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Jun 2025 |
| 21 | Southern Star Central Gas Pipeline, Inc. | Owensboro, KY 42301 | Oil & Gas Operator | May 2025 |
| 22 | Southwestern Exploration Consultants Inc | Oklahoma City, OK 73118-1116 | Oil & Gas Operator | Jul 2025 |
| 23 | SP Energy Development Company | Seattle, WA 98101-3277 | Oil & Gas Operator | Mar 2015 |
| 24 | Special Energy Corporation | Stillwater, OK 74076 | Oil & Gas Operator | Oct 2025 |
| 25 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Jul 2025 |
| 26 | Spring Valley Oil & Gas Inc | Drummond, OK 73735 | Oil & Gas Operator | Jul 2025 |
| 27 | Squirrel Oil & Gas Inc | Tonkawa, OK 74653 | Oil & Gas Operator | Mar 2022 |
| 28 | Stallion Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2017 |
| 29 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 30 | Stillwater Oil & Gas | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 31 | STP Cherokee, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2014 |
| 32 | STP Newco Inc | Oklahoma City, OK 73102-5641 | Oil & Gas Operator | Jul 2021 |
| 33 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 34 | Struthers Oil & Gas Corp | Tulsa, OK 74133 | Oil & Gas Operator | Jan 2013 |
| 35 | Summa Engineering Inc | Oklahoma City, OK 73112-3624 | Oil & Gas Operator | Mar 2015 |
| 36 | Sundance Operating Co | | Oil & Gas Operator | Jul 2016 |
| 37 | Superior Oil & Gas LLC | Ringwood, OK 73768-9658 | Oil & Gas Operator | Jul 2025 |
| 38 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |
| 39 | Supplyco Inc | Perry, OK 73077 | Oil & Gas Operator | Apr 2014 |
| 40 | Swenton, Michael J. | Tulsa, OK 74105 | Oil & Gas Operator | Jun 2025 |