| 1 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2025 |
| 2 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 3 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 4 | Sandridge Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2018 |
| 5 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Jun 2025 |
| 6 | Santa Fe Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 7 | Santa Rita Resources Inc & Subs | | Oil & Gas Operator | Mar 2015 |
| 8 | Schmid Properties Inc | Hico, TX 76457 | Oil & Gas Operator | Jun 2025 |
| 9 | Schonwald Supply Company | Oklahoma City, OK 73101-1571 | Oil & Gas Operator | May 1999 |
| 10 | Scoggins Production Company | Cleo Springs, OK 73729-9732 | Oil & Gas Operator | May 2022 |
| 11 | Scoggins Production LLC | Enid, OK 73703-3002 | Oil & Gas Operator | Mar 2025 |
| 12 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 13 | Seals And Brown Oil Operating | Norman, OK 73072-3020 | Oil & Gas Operator | Sep 2024 |
| 14 | Service Drilling Co. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1998 |
| 15 | Service Drilling Co., L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2003 |
| 16 | Seven Horses LLC | Alva, OK 73717-5004 | Oil & Gas Operator | Mar 2025 |
| 17 | Shadow-Del Oil Company | Kiefer, OK 74041-0453 | Oil & Gas Operator | Jul 2015 |
| 18 | Shannon Petroleum Inc | Tulsa, OK 74136-4603 | Oil & Gas Operator | Oct 2016 |
| 19 | Shell Western Expl & Prod Inc | Houston, TX 77251 | Oil & Gas Operator | Mar 2015 |
| 20 | Shelly Energy Inc. | Berwyn, PA 19312 | Oil & Gas Operator | Mar 2025 |
| 21 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Feb 2025 |
| 22 | Singer Oil Company | Oklahoma City, OK 73148 | Oil & Gas Operator | Feb 2025 |
| 23 | Skycap Energy, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Mar 2025 |
| 24 | Sloan Petroleum Service Inc | Guthrie, OK 73044 | Oil & Gas Operator | Mar 2025 |
| 25 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Jun 2025 |
| 26 | Smiley Drilling Co | Oklahoma City, OK 73156-0773 | Oil & Gas Operator | Apr 1999 |
| 27 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 28 | Sooner Acquisition Corp | Wichita, KS 67206 | Oil & Gas Operator | Sep 1993 |
| 29 | Sooner Exploration & Development Co Inc | Enid, OK 73702-3525 | Oil & Gas Operator | Oct 2023 |
| 30 | South Forty, The, Inc. | Laverne, OK 73848 | Oil & Gas Operator | Mar 2015 |
| 31 | Southwest Energy Development Inc | Bison, OK 73720 | Oil & Gas Operator | Feb 2025 |
| 32 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 33 | SP Energy Development Company | Seattle, WA 98101-3277 | Oil & Gas Operator | Mar 2015 |
| 34 | Special Energy Corporation | Stillwater, OK 74076 | Oil & Gas Operator | Jun 2025 |
| 35 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Mar 2025 |
| 36 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 37 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 38 | Staghorn Petroleum II LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Mar 2025 |
| 39 | Staghorn Petroleum LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Feb 2025 |
| 40 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |
| 41 | Startex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Jun 2025 |
| 42 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Mar 2025 |
| 43 | Stevens & Tull, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2000 |
| 44 | Stewart K Petroleum Corp | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 45 | Stillwater Oil & Gas | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 46 | Stoneriver Energy, LLC | Lubbock, TX 79424 | Oil & Gas Operator | Jun 2025 |
| 47 | STP Cherokee, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2014 |
| 48 | STP Newco Inc | Oklahoma City, OK 73102-5641 | Oil & Gas Operator | Jul 2021 |
| 49 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 50 | Stride Energy LLC | Piedmont, OK 73078 | Oil & Gas Operator | Mar 2025 |
| 51 | Sullivan & Co. | Tulsa, OK 74114 | Oil & Gas Operator | May 2022 |
| 52 | Sullivan And Company LLC | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2025 |
| 53 | Sundance Energy Oklahoma LLC Dba Seo LLC | Denver, CO 80202-3620 | Oil & Gas Operator | Nov 2021 |
| 54 | Sundance Operating Co | | Oil & Gas Operator | Jul 2016 |
| 55 | Superior Oil & Gas LLC | Ringwood, OK 73768-9658 | Oil & Gas Operator | Mar 2025 |
| 56 | Superior Production LLC | Ringwood, OK 73768 | Oil & Gas Operator | Mar 2025 |
| 57 | Sweetwater Exploration LLC | Norman, OK 73069-5636 | Oil & Gas Operator | Feb 2025 |
| 58 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |