| 1 | S & C Resources Inc | Cleveland, OK 74020 | Oil Operator | May 2025 |
| 2 | S & M Production Inc | Pawnee, OK 74058 | Oil & Gas Operator | Aug 2023 |
| 3 | S & S Oil Company | Electra, TX 76360 | Oil & Gas Operator | Jul 2026 |
| 4 | S T Industries Inc | Drumright, OK 74030 | Oil & Gas Operator | Mar 2011 |
| 5 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2026 |
| 6 | Sand Point Production Inc | Oklahoma City, OK 73172 | Oil & Gas Operator | Apr 2026 |
| 7 | Sand Resources LLC | Norman, OK 73072-4805 | Oil & Gas Operator | Aug 2012 |
| 8 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Jul 2026 |
| 9 | Sanook Inc | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Jan 2007 |
| 10 | Santa Fe Energy Operating Partner LP | Midland, TX 79701 | Oil & Gas Operator | Sep 2004 |
| 11 | Santa Rita Resources Inc & Subs | | Oil & Gas Operator | Mar 2015 |
| 12 | Sasser Company Inc (The) | Perkins, OK 74059-0515 | Oil & Gas Operator | Jan 2026 |
| 13 | Scavenger Oil Company Inc | Englewood, CO 80111 | Oil & Gas Operator | Mar 2000 |
| 14 | Schooley Keith A | Enid, OK 73702-0767 | Oil Operator | May 2006 |
| 15 | Schuler Oil Properties LLC | Cleveland, OK 74020 | Oil Operator | May 2026 |
| 16 | Scissortail Energy LLC | Tulsa, OK 74137-3644 | Oil & Gas Operator | May 2026 |
| 17 | Sead Operating Company LLC | Depew, OK 74028 | Oil Operator | Apr 2026 |
| 18 | Seagrove Resources LLC | Malakoff, TX 75148 | Oil & Gas Operator | Apr 2026 |
| 19 | Selco Oil And Gas Inc | Alamo, CA 94507 | Oil & Gas Operator | May 2026 |
| 20 | Sellers Jack B Estate Of | Cleveland, OK 74020 | Oil & Gas Operator | Apr 2026 |
| 21 | Sellers Mark A | Drumright, OK 74030 | Oil & Gas Operator | Mar 2020 |
| 22 | Sequoyah Energy Holdings LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | May 2026 |
| 23 | Service Drilling Co. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1998 |
| 24 | Service Drilling Co., L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2003 |
| 25 | Settlers Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Nov 2000 |
| 26 | Sevitski & Associates Inc | Pryor, OK 74361 | Oil & Gas Operator | Dec 2000 |
| 27 | Shamrock Well Operations LLC | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Apr 2026 |
| 28 | Shawver & Son Inc | Oklahoma City, OK 73154-0778 | Oil & Gas Operator | Dec 2025 |
| 29 | Shawver Energy Inc | Oklahoma City, OK 73154-0683 | Oil & Gas Operator | Apr 2014 |
| 30 | Shideler Enterprises Inc | Drumright, OK 74030 | Oil & Gas Operator | Feb 2019 |
| 31 | Shields Cooper | Bonita Springs, FL 34135-3421 | Oil & Gas Operator | Jan 2011 |
| 32 | Shields Energy Inc | Fort Smith, AR 72901-4607 | Oil & Gas Operator | Apr 2026 |
| 33 | Shields Operating Inc | Fort Smith, AR 72901-3834 | Oil & Gas Operator | Oct 2021 |
| 34 | Shipman James E Dba Lazy J Oil Co | Hallett, OK 74034 | Oil Operator | Mar 2026 |
| 35 | Short W D Revocable Trust | Oxford, KS 67119-0729 | Oil & Gas Operator | Mar 2015 |
| 36 | Silberman A & M Oil | Oklahoma City, OK 73122-3096 | Oil & Gas Operator | Apr 2014 |
| 37 | Silvertin Farm Production LLC | Poteau, OK 74953 | Oil & Gas Operator | Apr 2020 |
| 38 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 39 | Smith Mike D | Stillwater, OK 74074 | Oil & Gas Operator | Apr 2015 |
| 40 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 41 | Sopac Exploration Inc | Drumright, OK 74030 | Oil & Gas Operator | Jun 1993 |
| 42 | Sorrels J R Dba Cheyenne Oil Properties | Ponca City, OK 74601 | Oil & Gas Operator | Jul 2022 |
| 43 | Southern Star Central Gas Pipeline Inc | Owensboro, KY 42301 | Oil & Gas Operator | Mar 2026 |
| 44 | Southstar Oil And Gas Inc | Andover, KS 67002-0123 | Oil & Gas Operator | Jul 2020 |
| 45 | Southwest Petroleum Corp | Drumright, OK 74030 | Oil & Gas Operator | Mar 2018 |
| 46 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jul 2026 |
| 47 | Sparks Greg | Afton, OK 74331 | Oil & Gas Operator | Apr 2026 |
| 48 | Sparks Mick Oil Company Inc | Jennings, OK 74038-0250 | Oil & Gas Operator | Apr 2026 |
| 49 | Sparks Resources Inc | Bristow, OK 74010 | Oil & Gas Operator | May 2026 |
| 50 | Special Energy Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Jul 2026 |
| 51 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | May 2026 |
| 52 | Stacy Operating LLC | Cushing, OK 74023 | Oil & Gas Operator | Apr 2026 |
| 53 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |
| 54 | Statex Petroleum Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 55 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | May 2026 |
| 56 | Still A B Wel-Service Inc | Drumright, OK 74030-0787 | Oil & Gas Operator | Jul 2019 |
| 57 | Still Alex B Estate Of | Sagle, ID 83860-0644 | Oil & Gas Operator | Nov 2018 |
| 58 | Stillwater Oil & Gas | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 59 | Striker Petroleum Operations LLC | Frisco, TX 75034-2127 | Oil & Gas Operator | Nov 2014 |
| 60 | Sullivan & Co. | Tulsa, OK 74114 | Oil & Gas Operator | May 2022 |
| 61 | Sullivan And Company LLC | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2026 |
| 62 | Supplyco Inc | Perry, OK 73077 | Oil & Gas Operator | Apr 2014 |
| 63 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |