| 801 | Wind River Exploration Inc | Sewickley, PA 15143 | Oil & Gas Operator | Mar 2026 |
| 802 | Windfall Oil & Gas Inc | Falls Creek, PA 15840-2617 | Gas Operator | Dec 2024 |
| 803 | Winfall Energy Inc N V | Vandergrift, PA 15690-2001 | Oil & Gas Operator | Dec 2025 |
| 804 | Wood Drilling LLC | Kittanning, PA 16201 | Gas Operator | Dec 2025 |
| 805 | Wood William C | Kittanning, PA 16201-4328 | Oil & Gas Operator | Dec 2018 |
| 806 | XPR Resources LLC | Canonsburg, PA 15317-5862 | Gas Operator | Apr 2026 |
| 807 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Jul 2026 |
| 808 | Yeagle George W | Warren, PA 16365-0924 | Oil Operator | Dec 2010 |
| 809 | Yellowbird Energy LLC | Canonsburgh, PA 15317 | Gas Operator | Dec 2025 |
| 810 | Zama Petro Inc | Clinton, WA 98236-0100 | Oil & Gas Operator | Dec 2025 |
| 811 | Zenith Exploration Co Inc | Washington, PA 15301 | Oil & Gas Operator | Dec 2014 |
| 812 | Zoran Oil & Gas Co | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2025 |