| 1 | U S F S | Warren County, PA | Oil & Gas Property | Dec 2015 |
| 2 | U S F S | Warren County, PA | Oil & Gas Property | Dec 2023 |
| 3 | U S F S & R I STOVER KB | Warren County, PA | Oil & Gas Property | Dec 2023 |
| 4 | U S F S LOT 201 KC | Warren County, PA | Oil & Gas Property | Dec 2023 |
| 5 | U S FOREST SERVICE | Warren County, PA | Oil & Gas Property | Dec 2023 |
| 6 | U S FOREST SERVICE | Warren County, PA | Oil & Gas Property | Dec 2023 |
| 7 | U S FOREST SVC CENTRAL PA LUMBER | Warren County, PA | Oil & Gas Property | Dec 2023 |
| 8 | U S GOVT/ARMSTRONG FOREST | McKean County, PA | Oil & Gas Property | Dec 2023 |
| 9 | U S STEEL | Greene County, PA | Gas Property | Dec 2023 |
| 10 | U.S.F.S | McKean County, PA | Oil & Gas Property | Dec 2020 |
| 11 | UBER | Indiana County, PA | Gas Property | Dec 2023 |
| 12 | UGLIUZZA 05 006 0 | Bradford County, PA | Gas Property | Jan 2024 |
| 13 | UHOUSE 05 081 0 | Bradford County, PA | Gas Property | Jan 2024 |
| 14 | ULTIMATE WARRIOR | Lycoming County, PA | Gas Property | Jan 2024 |
| 15 | UMBERT PETRARCA | Indiana County, PA | Gas Property | Dec 2023 |
| 16 | UNDERHILL COAL | Clearfield County, PA | Gas Property | Dec 2023 |
| 17 | UNGER | Armstrong County, PA | Gas Property | Dec 2023 |
| 18 | UNION RAILROAD | Allegheny County, PA | Gas Property | Dec 2023 |
| 19 | UNITED METHODIST | Butler County, PA | Oil & Gas Property | Dec 2023 |
| 20 | UNITY CEMETERY ASS | Westmoreland County, PA | Gas Property | Dec 2023 |
| 21 | UNITY LAND MGMT | Westmoreland County, PA | Gas Property | Dec 2023 |
| 22 | UPDIKE | Bradford County, PA | Gas Property | Jan 2024 |
| 23 | UPHAM 05 | Bradford County, PA | Gas Property | Jan 2024 |
| 24 | UPPER FUNK 1 | Warren County, PA | Oil & Gas Property | Dec 2023 |
| 25 | UPPERMAN | Armstrong County, PA | Gas Property | Dec 2023 |
| 26 | URBANICK | Crawford County, PA | Oil & Gas Property | Dec 2022 |
| 27 | URIAH GEORGE 328 | Clarion County, PA | Gas Property | Dec 2023 |
| 28 | URSA MAJOR | Butler County, PA | Gas Property | Jan 2024 |
| 29 | URSA MINOR | Butler County, PA | Gas Property | Jan 2024 |
| 30 | US FOREST SERVICE | Warren County, PA | Oil & Gas Property | Dec 2023 |
| 31 | US FOREST SERVICE COLLINS PINE | Warren County, PA | Oil & Gas Property | Dec 2023 |
| 32 | US GOVERNMENT NAT | Warren County, PA | Oil & Gas Property | Dec 2017 |
| 33 | US NATURAL RESOURCES | Washington County, PA | Gas Property | Jan 2024 |
| 34 | USCHAK | Westmoreland County, PA | Gas Property | Jan 2024 |
| 35 | USFS | McKean County, PA | Oil & Gas Property | Dec 2020 |
| 36 | USFS 7 | Warren County, PA | Oil & Gas Property | Dec 2023 |
| 37 | USX 1 | Fayette County, PA | Gas Property | Dec 2023 |
| 38 | USX CORP | Fayette County, PA | Gas Property | Dec 2022 |
| 39 | USX-BELLONE | Westmoreland County, PA | Gas Property | Dec 2023 |