| 1 | S J Oil Co. | Ellinwood, KS 67526 | Oil Operator | Jun 2000 |
| 2 | S M Brothers Investments LLC | Denver, CO 80210-6059 | Oil Operator | Jun 2025 |
| 3 | S T Industries Inc | Drumright, OK 74030 | Oil & Gas Operator | Mar 2011 |
| 4 | Sage NR Ok LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2025 |
| 5 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 6 | Samhill LLC | Tonkawa, OK 74653-5533 | Oil & Gas Operator | Jul 2025 |
| 7 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 8 | Sand Point Production Inc | Oklahoma City, OK 73172 | Oil & Gas Operator | Jun 2025 |
| 9 | Sandridge Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2018 |
| 10 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Oct 2025 |
| 11 | Sandstone Resources, Inc. | Houston, TX 77043 | Oil & Gas Operator | Oct 2025 |
| 12 | Santa Fe Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 13 | Santa Fe Energy Operating Partner LP | Midland, TX 79701 | Oil & Gas Operator | Sep 2004 |
| 14 | Schonwald Supply Company | Oklahoma City, OK 73101-1571 | Oil & Gas Operator | May 1999 |
| 15 | Scissortail Energy LLC | Tulsa, OK 74137-3644 | Oil & Gas Operator | Feb 2015 |
| 16 | Scout Energy Corporation | Edmond, OK 73083-1348 | Oil & Gas Operator | Jun 2025 |
| 17 | Seaboard Gas Company | Edmond, OK 73034 | Oil & Gas Operator | Feb 1999 |
| 18 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 19 | Seaport Inc | Oklahoma City, OK 73131 | Oil & Gas Operator | Jun 2025 |
| 20 | Selco Oil And Gas Inc | Alamo, CA 94507 | Oil & Gas Operator | Jun 2025 |
| 21 | Sensor Oil & Gas Inc | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 22 | Sentinel Petroleum Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2020 |
| 23 | Sequoyah Energy Holdings LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jul 2025 |
| 24 | Service Drilling Co. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1998 |
| 25 | Service Drilling Co., L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2003 |
| 26 | Settlers Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Apr 1998 |
| 27 | Shawver & Son Inc | Oklahoma City, OK 73154-0778 | Oil & Gas Operator | Oct 2024 |
| 28 | Shawver Energy Inc | Oklahoma City, OK 73154-0683 | Oil & Gas Operator | Apr 2014 |
| 29 | Shebester Inc | Maysville, OK 73057 | Oil & Gas Operator | Nov 1998 |
| 30 | Sheets George M & Judith A | Tonkawa, OK 74653 | Oil & Gas Operator | Jun 2025 |
| 31 | Shell Western Expl & Prod Inc | Houston, TX 77251 | Oil & Gas Operator | Mar 2015 |
| 32 | Short Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Jun 2025 |
| 33 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | May 2025 |
| 34 | Singer Fleischaker Oil Op. Co. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2002 |
| 35 | Smith C W & Associates Inc | Oklahoma City, OK 73178-0105 | Oil & Gas Operator | Aug 2013 |
| 36 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 37 | Sneed William A Bill | Cleveland, OK 74020-1007 | Oil & Gas Operator | Jun 2025 |
| 38 | SNR Operating, LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Oct 2025 |
| 39 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 40 | Sooner Exploration & Development Co Inc | Enid, OK 73702-3525 | Oil & Gas Operator | Oct 2023 |
| 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 | Southwest Energy Development Inc | Bison, OK 73720 | Oil & Gas Operator | Jul 2025 |
| 44 | Southwest Petroleum Oil & Gas Explor LLC | San Bernardino, CA 92404-1010 | Oil & Gas Operator | Jun 2022 |
| 45 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 46 | Southwestern Exploration Consultants Inc | Oklahoma City, OK 73118-1116 | Oil & Gas Operator | Jul 2025 |
| 47 | Spark'S Energy Inc | Perry, OK 73077 | Oil & Gas Operator | Nov 2014 |
| 48 | Special Energy Corporation | Stillwater, OK 74076 | Oil & Gas Operator | Oct 2025 |
| 49 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Jul 2025 |
| 50 | Spring Valley Oil & Gas Inc | Drummond, OK 73735 | Oil & Gas Operator | Jul 2025 |
| 51 | Stacy Operating LLC | Cushing, OK 74023 | Oil & Gas Operator | Jun 2025 |
| 52 | Statex Petroleum Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 53 | Stevens & Tull, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2000 |
| 54 | Stewart K Petroleum Corp | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 55 | Still A B Wel-Service Inc | Drumright, OK 74030-0787 | Oil & Gas Operator | Jul 2019 |
| 56 | Still Alex B Estate Of | Sagle, ID 83860-0644 | Oil & Gas Operator | Nov 2018 |
| 57 | Stillwater Oil & Gas | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 58 | Storm Exploration Inc | Skiatook, OK 74070-1014 | Oil & Gas Operator | Jan 2013 |
| 59 | Summit Resources Management LLC | Edmond, OK 73083 | Oil & Gas Operator | Jul 2025 |
| 60 | Sundance Energy Oklahoma LLC Dba Seo LLC | Denver, CO 80202-3620 | Oil & Gas Operator | Nov 2021 |
| 61 | Swinea Well Service Inc | Drumright, OK 74030 | Oil & Gas Operator | Mar 2015 |
| 62 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |
| 63 | Sydson D'Oro Expl. Co. | Houston, TX 77079 | Oil & Gas Operator | Jan 1992 |