| 5501 | O F HILL | Indiana County, PA | Gas Property | Dec 2025 |
| 5502 | O GIBSON | Armstrong County, PA | Gas Property | Dec 2025 |
| 5503 | O J KING | Armstrong County, PA | Gas Property | Dec 2025 |
| 5504 | O M RE | Clearfield County, PA | Gas Property | Dec 2025 |
| 5505 | O REILLY 1 | Susquehanna County, PA | Gas Property | Feb 2026 |
| 5506 | O W RIGGLE | Armstrong County, PA | Gas Property | Dec 2025 |
| 5507 | OAK RIDGE N | Susquehanna County, PA | Gas Property | Feb 2026 |
| 5508 | OAK TREE FAIRWAY UNIT | Mercer County, PA | Oil & Gas Property | Dec 2025 |
| 5509 | OAKES | McKean County, PA | Oil Property | Dec 2007 |
| 5510 | OAKES | Warren County, PA | Oil & Gas Property | Dec 2024 |
| 5511 | OAKLAND | Warren County, PA | Oil & Gas Property | Dec 2025 |
| 5512 | OAKLAND CEMET | Warren County, PA | Oil & Gas Property | Dec 2025 |
| 5513 | OAKMONT COUNT | Allegheny County, PA | Gas Property | Dec 2025 |
| 5514 | OAKMONT EAST | Allegheny County, PA | Gas Property | Dec 2025 |
| 5515 | OBER UNIT | Westmoreland County, PA | Gas Property | Dec 2025 |
| 5516 | OBER UNIT | Bradford County, PA | Gas Property | Feb 2026 |
| 5517 | OBLINSKY | Indiana County, PA | Gas Property | Dec 2025 |
| 5518 | OBRIEN | Susquehanna County, PA | Gas Property | Feb 2026 |
| 5519 | OCHS | Clarion County, PA | Gas Property | Dec 2025 |
| 5520 | OCHS | Clearfield County, PA | Gas Property | Dec 2025 |
| 5521 | OCHS INVESTMENT LTD PARTNERSHIP | Clarion County, PA | Gas Property | Dec 2025 |
| 5522 | OCHS/SBI | Armstrong County, PA | Gas Property | Dec 2025 |
| 5523 | OCTA NUPP | Indiana County, PA | Gas Property | Dec 2025 |
| 5524 | ODONNELL | Fayette County, PA | Oil & Gas Property | Dec 2025 |
| 5525 | ODONNELL | Warren County, PA | Oil & Gas Property | Dec 2025 |
| 5526 | ODONNELL JOSEPH UNIT | Washington County, PA | Gas Property | Feb 2026 |
| 5527 | ODOWD | Susquehanna County, PA | Gas Property | Feb 2026 |
| 5528 | OESTERLING | Armstrong County, PA | Gas Property | Feb 2026 |
| 5529 | OFFUTT | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 5530 | OGONTZ FISHING CLUB | Lycoming County, PA | Gas Property | Feb 2026 |
| 5531 | OHIO VALLEY LBC UNIT | Washington County, PA | Oil & Gas Property | Feb 2026 |
| 5532 | OIL CREEK S | Venango County, PA | Gas Property | Dec 2025 |
| 5533 | OILCAN | Bradford County, PA | Gas Property | Feb 2026 |
| 5534 | OLCZAK | Greene County, PA | Gas Property | Feb 2026 |
| 5535 | OLD HOME MANOR | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 5536 | OLD MCDONALD FARM UNIT | Washington County, PA | Gas Property | Feb 2026 |
| 5537 | OLD TOWN BEAGLE CLUB | Clearfield County, PA | Gas Property | Dec 2025 |
| 5538 | OLER THOMPSON B | Clearfield County, PA | Gas Property | Dec 2024 |
| 5539 | OLEXA | Fayette County, PA | Oil & Gas Property | Feb 2026 |
| 5540 | OLGA H WEBER | Jefferson County, PA | Gas Property | Dec 2025 |
| 5541 | OLIVER | Mercer County, PA | Oil & Gas Property | Dec 2025 |
| 5542 | OLIVER | Allegheny County, PA | Gas Property | Feb 2026 |
| 5543 | OLIVER | Fayette County, PA | Gas Property | Dec 2025 |
| 5544 | OLIVER EAST MON23H1 | Allegheny County, PA | Gas Property | Feb 2026 |
| 5545 | OLIVER FARM WARRANT 4004 | McKean County, PA | Oil & Gas Property | Dec 2009 |
| 5546 | OLIVER UNIT | Susquehanna County, PA | Gas Property | Feb 2026 |
| 5547 | OLIVER W PROPER | Elk County, PA | Oil & Gas Property | Dec 2025 |
| 5548 | OLLIE MORRIS | Jefferson County, PA | Gas Property | Dec 2025 |
| 5549 | OLSON | Warren County, PA | Gas Property | Dec 2025 |
| 5550 | OLSON 02 101 0 | Tioga County, PA | Gas Property | Feb 2026 |
| 5551 | OLSON ROBERT & MARGARET 3864 | Jefferson County, PA | Gas Property | Dec 2025 |
| 5552 | OLSON UNIT | Venango County, PA | Gas Property | Dec 2025 |
| 5553 | OLYMPIC LAKE ESTATES 07 083 0 | Susquehanna County, PA | Gas Property | Feb 2026 |
| 5554 | OMR (02-188 | Tioga County, PA | Gas Property | Feb 2026 |
| 5555 | ONEIL | Warren County, PA | Oil Property | Dec 2025 |
| 5556 | ONEILL | Warren County, PA | Oil Property | Dec 2025 |
| 5557 | ONIFRO O | McKean County, PA | Oil & Gas Property | Dec 2005 |
| 5558 | OPACIC | Westmoreland County, PA | Oil & Gas Property | Dec 2025 |
| 5559 | ORENCHUK RUSSELL 11890 | Washington County, PA | Gas Property | Feb 2026 |
| 5560 | ORIN LEE NEAL | Jefferson County, PA | Gas Property | Dec 2025 |
| 5561 | ORIS | Mercer County, PA | Oil & Gas Property | Dec 2024 |
| 5562 | ORIS M. SCHRECENGOST | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 5563 | ORLANDO HARMAN | Armstrong County, PA | Gas Property | Dec 2025 |
| 5564 | ORLOSKY | Mercer County, PA | Gas Property | Dec 2025 |
| 5565 | ORMSBY DEVONIAN | McKean County, PA | Gas Property | Dec 1993 |
| 5566 | OROURKE 05 046 0 | Bradford County, PA | Gas Property | Feb 2026 |
| 5567 | ORR 1 | Fayette County, PA | Oil & Gas Property | Dec 2025 |
| 5568 | ORR 2 | Fayette County, PA | Oil & Gas Property | Dec 2025 |
| 5569 | ORR 3 | Fayette County, PA | Oil & Gas Property | Dec 2025 |
| 5570 | ORTH B | Warren County, PA | Oil & Gas Property | Dec 2024 |
| 5571 | ORTHODOX | Crawford County, PA | Oil & Gas Property | Dec 2025 |
| 5572 | ORTON | Erie County, PA | Gas Property | Dec 1986 |
| 5573 | ORTON | Washington County, PA | Oil & Gas Property | Apr 2023 |
| 5574 | ORVILLE | Indiana County, PA | Gas Property | Dec 2025 |
| 5575 | ORVILLE M WATSON | Indiana County, PA | Gas Property | Dec 2025 |
| 5576 | ORVILLE W. PRESCOTT | Clearfield County, PA | Gas Property | Dec 2025 |
| 5577 | ORWICK | Clearfield County, PA | Gas Property | Dec 2025 |
| 5578 | OS BURNHAM | Crawford County, PA | Gas Property | Dec 2017 |
| 5579 | OSCAR B GRANT | Elk County, PA | Oil & Gas Property | Dec 2025 |
| 5580 | OSCAR C BENSON | Jefferson County, PA | Gas Property | Dec 2025 |
| 5581 | OSCAR EARL HOUSER | Armstrong County, PA | Gas Property | Dec 2025 |
| 5582 | OSCAR J DRESSLER | Clearfield County, PA | Gas Property | Dec 2025 |
| 5583 | OSLEY | Fayette County, PA | Gas Property | Dec 2025 |
| 5584 | OSSESIA | Clarion County, PA | Gas Property | Dec 2025 |
| 5585 | OSSESSIA | Clarion County, PA | Gas Property | Dec 2025 |
| 5586 | OSTRANDER | Tioga County, PA | Gas Property | Feb 2026 |
| 5587 | OSTRICH | Greene County, PA | Gas Property | Feb 2026 |
| 5588 | OTIS | Bradford County, PA | Gas Property | Feb 2026 |
| 5589 | OTIS IRONS | McKean County, PA | Gas Property | Dec 2025 |
| 5590 | OTIS PROCIOUS ETAL | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 5591 | OTT 1 | Warren County, PA | Gas Property | Dec 2024 |
| 5592 | OTT 2 | Warren County, PA | Gas Property | Dec 2024 |
| 5593 | OTTEN | Wyoming County, PA | Gas Property | Feb 2026 |
| 5594 | OTTEN | Bradford County, PA | Gas Property | Feb 2026 |
| 5595 | OTTER WELL SVC | McKean County, PA | Oil & Gas Property | Dec 2025 |
| 5596 | OTTO CHEM | Elk County, PA | Gas Property | Dec 2025 |
| 5597 | OVER | Clarion County, PA | Gas Property | Dec 2025 |
| 5598 | OVER | Clarion County, PA | Oil & Gas Property | Dec 2025 |
| 5599 | OW PROPER | Elk County, PA | Gas Property | Dec 2025 |
| 5600 | OWENS | Warren County, PA | Oil & Gas Property | Dec 2025 |