| 1401 | COMMONWEALTH OF PA SC3 | Elk County, PA | Oil & Gas Property | Dec 2017 |
| 1402 | COMMONWEALTH OF PA TR | Centre County, PA | Gas Property | Dec 2025 |
| 1403 | COMMONWEALTH OF PA TR | Centre County, PA | Gas Property | Dec 2016 |
| 1404 | COMMONWEALTH OF PA TR | Centre County, PA | Gas Property | Dec 2013 |
| 1405 | COMSTOCK | Bradford County, PA | Gas Property | Dec 2025 |
| 1406 | CONELLY C | Forest County, PA | Oil Property | Dec 2025 |
| 1407 | CONEMAUGH LAND CO | Indiana County, PA | Gas Property | Dec 2024 |
| 1408 | CONERTY | Armstrong County, PA | Oil & Gas Property | Dec 2014 |
| 1409 | CONEWANGO DEV | Warren County, PA | Oil & Gas Property | Dec 2025 |
| 1410 | CONFER | Fayette County, PA | Gas Property | Dec 2025 |
| 1411 | CONFER P | Centre County, PA | Gas Property | Dec 2025 |
| 1412 | CONFER W | Centre County, PA | Gas Property | Dec 2025 |
| 1413 | CONGELIO | Fayette County, PA | Gas Property | Dec 2025 |
| 1414 | CONIGLIARO | Susquehanna County, PA | Gas Property | Dec 2025 |
| 1415 | CONKLIN | McKean County, PA | Oil & Gas Property | Dec 2009 |
| 1416 | CONKLIN | Susquehanna County, PA | Gas Property | Dec 2025 |
| 1417 | CONKLIN HOLLOW | Clinton County, PA | Gas Property | Dec 2025 |
| 1418 | CONKLIN LEASE C | Warren County, PA | Oil & Gas Property | Dec 2024 |
| 1419 | CONN | Venango County, PA | Oil & Gas Property | Dec 2025 |
| 1420 | CONNALLY | Forest County, PA | Oil Property | Dec 2025 |
| 1421 | CONNELL SUL | Sullivan County, PA | Gas Property | Dec 2025 |
| 1422 | CONNELLSVILLE SPORTSM | Fayette County, PA | Gas Property | Dec 2025 |
| 1423 | CONNELLY C | Forest County, PA | Oil Property | Dec 2025 |
| 1424 | CONNOLLY | Tioga County, PA | Gas Property | Dec 2025 |
| 1425 | CONNORS 59 | Greene County, PA | Gas Property | Dec 2025 |
| 1426 | CONRAD BEL | Westmoreland County, PA | Gas Property | Dec 2025 |
| 1427 | CONRAIL | Fayette County, PA | Gas Property | Dec 2025 |
| 1428 | CONRAIL | Fayette County, PA | Oil & Gas Property | Dec 2025 |
| 1429 | CONRHEIN | Greene County, PA | Gas Property | Dec 2025 |
| 1430 | CONRHEIN N | Greene County, PA | Gas Property | Dec 2025 |
| 1431 | CONRHEIN NV | Washington County, PA | Gas Property | Dec 2025 |
| 1432 | CONSOL | Greene County, PA | Gas Property | Dec 2025 |
| 1433 | CONSOL | Greene County, PA | Gas Property | Dec 2025 |
| 1434 | CONSOL | Greene County, PA | Gas Property | Dec 2025 |
| 1435 | CONSOL GH | Greene County, PA | Gas Property | Dec 2025 |
| 1436 | CONSOL MOR | Greene County, PA | Gas Property | Dec 2025 |
| 1437 | CONSOL MOR44 | Washington County, PA | Gas Property | Dec 2025 |
| 1438 | CONSOL NV | Washington County, PA | Oil & Gas Property | Dec 2025 |
| 1439 | CONSOL NV57 | Washington County, PA | Gas Property | Dec 2025 |
| 1440 | CONSOL PA | Greene County, PA | Gas Property | Dec 2025 |
| 1441 | CONSOL PA COAL CO | Greene County, PA | Gas Property | Dec 2023 |
| 1442 | CONSOL PENNSYLVANIA CO | Greene County, PA | Gas Property | Dec 2025 |
| 1443 | CONSOL RHL11 | Greene County, PA | Gas Property | Dec 2025 |
| 1444 | CONSOL WFN6 | Washington County, PA | Oil & Gas Property | Dec 2025 |
| 1445 | CONSOL/USX | Greene County, PA | Oil & Gas Property | Dec 2025 |
| 1446 | CONSOL/USX | Greene County, PA | Oil & Gas Property | Dec 2025 |
| 1447 | CONSOLIDATED RAIL CORP | Clearfield County, PA | Gas Property | Dec 2018 |
| 1448 | CONSOLIDATED RAIL CORPORATION | Allegheny County, PA | Gas Property | Dec 2025 |
| 1449 | CONSOLIDATION COAL CO | Allegheny County, PA | Oil & Gas Property | Dec 2025 |
| 1450 | CONSOLIDATION COAL CO | Allegheny County, PA | Gas Property | Dec 2024 |
| 1451 | CONSOLIDATION COAL CO | Monongalia County, WV | Gas Property | Dec 2019 |
| 1452 | CONSTANTINE | Fayette County, PA | Oil & Gas Property | Dec 2025 |
| 1453 | COOK | Venango County, PA | Oil Property | Dec 1998 |
| 1454 | COOK 05 040 0 | Bradford County, PA | Gas Property | Dec 2025 |
| 1455 | COOK FOREST STATE PARK | Clarion County, PA | Gas Property | Dec 2025 |
| 1456 | COOK N SUS | Susquehanna County, PA | Gas Property | Dec 2025 |
| 1457 | COOK UNIT | Jefferson County, PA | Gas Property | Dec 2025 |
| 1458 | COOK UNIT 1 | Westmoreland County, PA | Gas Property | Dec 2025 |
| 1459 | COOK/SMITH | Fayette County, PA | Oil & Gas Property | Dec 2025 |
| 1460 | COOLEY | Bradford County, PA | Gas Property | Dec 2025 |
| 1461 | COOLEY (05-266-0 | Bradford County, PA | Gas Property | Dec 2025 |
| 1462 | COOLEY 05 004 01 P 1H OG WELL | Bradford County, PA | Gas Property | Dec 2025 |
| 1463 | COON HOLLOW 904 | Potter County, PA | Gas Property | Dec 2025 |
| 1464 | COOPER | Forest County, PA | Oil & Gas Property | Dec 2025 |
| 1465 | COOPER | Venango County, PA | Oil & Gas Property | Dec 1997 |
| 1466 | COOPER 400 1H | Tioga County, PA | Gas Property | Dec 2025 |
| 1467 | COOPER 590 | Greene County, PA | Oil & Gas Property | May 2020 |
| 1468 | COOPER CHARLES | Washington County, PA | Oil & Gas Property | Dec 2011 |
| 1469 | COP 2 | Elk County, PA | Gas Property | Dec 2025 |
| 1470 | COP 324 | Clearfield County, PA | Gas Property | Dec 2025 |
| 1471 | COP 3H 4093 | Elk County, PA | Gas Property | Dec 2025 |
| 1472 | COP 4 | Clearfield County, PA | Gas Property | Dec 2025 |
| 1473 | COP 5H 2316 | Elk County, PA | Gas Property | Dec 2025 |
| 1474 | COP 6 | Elk County, PA | Gas Property | Dec 2025 |
| 1475 | COP 6 | Clearfield County, PA | Gas Property | Dec 2025 |
| 1476 | COP 7 | Clearfield County, PA | Gas Property | Dec 2025 |
| 1477 | COP 8 | Clearfield County, PA | Gas Property | Dec 2025 |
| 1478 | COP TR | Centre County, PA | Gas Property | Dec 2016 |
| 1479 | COP TR | Centre County, PA | Gas Property | Dec 2025 |
| 1480 | COP TR | Centre County, PA | Gas Property | Dec 2025 |
| 1481 | COP TR 32 | Clearfield County, PA | Gas Property | Dec 2025 |
| 1482 | COP TRACT | Clinton County, PA | Oil & Gas Property | Dec 2025 |
| 1483 | COP TRACT | Clinton County, PA | Gas Property | Dec 2025 |
| 1484 | COP TRACT | Clinton County, PA | Gas Property | Dec 2025 |
| 1485 | COP TRACT | Lycoming County, PA | Gas Property | Dec 2025 |
| 1486 | COP TRACT 322 PAD | Lycoming County, PA | Gas Property | Dec 2025 |
| 1487 | COP TRACT 551 | Lycoming County, PA | Gas Property | Dec 2025 |
| 1488 | COP TRACT 596 PAD | Tioga County, PA | Gas Property | Dec 2025 |
| 1489 | COP TRACT 706 | Centre County, PA | Gas Property | Dec 2025 |
| 1490 | COP TRACT 726 | Lycoming County, PA | Gas Property | Dec 2025 |
| 1491 | COP TRACT 727 PAD 3 | Clinton County, PA | Gas Property | Dec 2025 |
| 1492 | COP WT 2 | Elk County, PA | Gas Property | Dec 2025 |
| 1493 | COP WT 2314 | McKean County, PA | Gas Property | Dec 2025 |
| 1494 | COPELAND | Forest County, PA | Oil Property | Dec 2024 |
| 1495 | CORA A BROWN | Armstrong County, PA | Gas Property | Dec 2025 |
| 1496 | CORA BELLE TURNER | Westmoreland County, PA | Oil & Gas Property | Dec 2025 |
| 1497 | CORBETT | Westmoreland County, PA | Gas Property | Dec 2025 |
| 1498 | CORBETT | Clarion County, PA | Oil & Gas Property | Dec 2020 |
| 1499 | CORBETT | Bradford County, PA | Gas Property | Dec 2025 |
| 1500 | CORBIN | Indiana County, PA | Oil & Gas Property | Dec 2022 |