| 2801 | Swepi/Western Division | Houston, TX 77210 | Oil & Gas Operator | Aug 1984 |
| 2802 | Swevco-Sabw LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2026 |
| 2803 | Swiess & Thomas | San Antonio, TX 78247 | Oil Operator | Apr 2026 |
| 2804 | Swift A W & Company Inc | Sand Springs, OK 74063-5124 | Oil Operator | Jun 2003 |
| 2805 | Swift Energy Com | | Oil & Gas Operator | Sep 1995 |
| 2806 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 2807 | Swift Energy Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Jun 2017 |
| 2808 | Swinea Well Service Inc | Drumright, OK 74030 | Oil & Gas Operator | Mar 2015 |
| 2809 | Swingle Drilling Inc | Crooksville, OH 43731 | Oil & Gas Operator | Dec 2025 |
| 2810 | Swinkwood Oil Co | | Oil Operator | Apr 2015 |
| 2811 | Switchgrass E&P Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jan 2026 |
| 2812 | SWJN Oil Company | Kilgore, TX 75663 | Oil Operator | Apr 2026 |
| 2813 | SWN Production (Louisiana), LLC | | Oil & Gas Operator | Dec 2024 |
| 2814 | SWN Production (Ohio), LLC | Spring, TX 77389 | Oil & Gas Operator | Mar 2024 |
| 2815 | SWN Production Company, LLC | Spring, TX 77391 | Oil & Gas Operator | Dec 2025 |
| 2816 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |
| 2817 | Swo & Ism, LLC | | Oil & Gas Operator | Dec 2021 |
| 2818 | Swope Corp. | Austin, TX 78735 | Oil & Gas Operator | Apr 2026 |
| 2819 | Swordfish Energy Operating, LLC | Houston, TX 77060 | Oil & Gas Operator | Apr 2026 |
| 2820 | SWS | Humble, TX 77338 | Oil Operator | Apr 2026 |
| 2821 | SWS Operating LLC | Lawton, OK 73501-3236 | Oil Operator | Sep 2024 |
| 2822 | SWV Energy Operating LLC | Spring, TX 77379 | Gas Operator | Dec 2018 |
| 2823 | SX54, LLC | Sheridan, WY 82801 | Oil Operator | Nov 2017 |
| 2824 | Sycamore Development Partners LLC | | Oil & Gas Operator | Dec 2025 |
| 2825 | Sydri Operating, LLC | Dallas, TX 75231 | Oil & Gas Operator | Apr 2026 |
| 2826 | Sydson D'Oro Exploration Co. | Houston, TX 77079 | Oil & Gas Operator | Jan 1992 |
| 2827 | Sydson Energy, Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2026 |
| 2828 | Syj Oil & Gas | San Antonio, TX 78209 | Oil Operator | Sep 2000 |
| 2829 | Syj Oil & Gas, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2026 |
| 2830 | Sylvan Energy, LLC | Pittsburgh, PA 15211 | Oil & Gas Operator | Apr 2026 |
| 2831 | Sylvan Oil Operating Company | Tulsa, OK 74103-3516 | Oil & Gas Operator | Apr 2016 |
| 2832 | Sylvite Corp | Tulsa, OK 741363908 | Oil & Gas Operator | Dec 2000 |
| 2833 | Symank, Steve | Olney, TX 76374 | Oil & Gas Operator | Apr 2026 |
| 2834 | Symba American Oil, Inc | Houston, TX 77056 | Oil Operator | Apr 2026 |
| 2835 | Synd Enterprises Inc | Lakewood, NY 14750-9613 | Oil & Gas Operator | Dec 2006 |
| 2836 | Syndex Resources, Inc. | Wellesley, MA 02181-000 | Oil & Gas Operator | Dec 2021 |
| 2837 | Synergex Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Jan 2026 |
| 2838 | Synergy Development Corp | | Oil Operator | Apr 2011 |
| 2839 | Synergy Offshore LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2022 |
| 2840 | Synergy Oil & Gas LLC | | Oil & Gas Operator | Dec 2025 |
| 2841 | Synergy Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | Nov 2019 |
| 2842 | Synergy Oil & Gas, Inc. (A) | Houston, TX 77024 | Oil & Gas Operator | Aug 2001 |
| 2843 | Synergy Oil & Gas, L.P. | Houston, TX 77024 | Oil & Gas Operator | May 2012 |
| 2844 | Synergy Operating Co., LLC | Dallas, TX 75225 | Oil & Gas Operator | Apr 2026 |
| 2845 | Synergy Operating LLC | Farmington, NM 87499 | Oil & Gas Operator | Nov 2025 |
| 2846 | Synergy Production Company | Houston, TX 77024 | Oil & Gas Operator | Jan 1996 |
| 2847 | Synergy Resources | Artesia, NM 88210 | Oil & Gas Operator | Jan 2015 |
| 2848 | Syntax Energy Corporation | Denton, TX 76210 | Oil Operator | Apr 2026 |
| 2849 | Synthetic Energy Corporation | Houston, TX 77006 | Oil Operator | Apr 2026 |
| 2850 | Szumigala, Edward R. & Ruth A. | Dunkirk, NY 14048 | Gas Operator | Dec 2024 |