| 1 | S & S Energy | Englewood, CO 80112 | Oil & Gas Operator | Mar 2015 |
| 2 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 3 | Samson Exploration LLC | Tulsa, OK 74101 | Oil & Gas Operator | Oct 2024 |
| 4 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 5 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 6 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2024 |
| 7 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2024 |
| 8 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 9 | Sandalwood Exploration, L.P. | Houston, TX 77056 | Oil & Gas Operator | Dec 2024 |
| 10 | Sandpoint Texas LLC | Houston, TX 77270 | Oil Operator | Dec 2024 |
| 11 | Sandridge Onshore, LLC | Houston, TX 77010 | Oil & Gas Operator | Jun 2014 |
| 12 | Sawtooth Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Dec 2024 |
| 13 | Saxet Operating Co.,Inc. | Madisonville, TX 77864 | Oil & Gas Operator | Dec 2024 |
| 14 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 15 | Secondary Gas Recovery Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1993 |
| 16 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 17 | Service Production Company, Inc. | Santa Fe, TX 77510 | Oil & Gas Operator | May 1999 |
| 18 | Shell Trading Us Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2024 |
| 19 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Dec 2024 |
| 20 | Sideline Oil & Gas, L.P. | Friendswood, TX 77549 | Oil Operator | Dec 2024 |
| 21 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2024 |
| 22 | Smith Energy 1986a Partnership | Alvin, TX 77511 | Oil & Gas Operator | Feb 2010 |
| 23 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Dec 2024 |
| 24 | Smith, L. C. | Jacksonville, TX 75766 | Oil & Gas Operator | Dec 2024 |
| 25 | Sonterra Oil & Gas, Inc. | Wichita, KS 67217 | Oil & Gas Operator | Dec 2024 |
| 26 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 27 | Spartan Petroleum Corporation | Houston, TX 77079 | Oil & Gas Operator | Oct 1987 |
| 28 | Square Mile Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Dec 2024 |
| 29 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 30 | Standard Resources Corp. | Houston, TX 77063 | Oil & Gas Operator | Dec 2024 |
| 31 | Startex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Dec 2024 |
| 32 | Stealth Onsite Solutions LLC | Pasadena, TX 77505 | Oil Operator | Dec 2024 |
| 33 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Sep 2024 |
| 34 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Dec 2024 |
| 35 | Stroud Production LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2024 |
| 36 | STS Petroleum LLC | Houston, TX 77289 | Oil & Gas Operator | Dec 2024 |
| 37 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Dec 2024 |
| 38 | Suemaur Expl. & Prod., LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jun 2024 |