| 501 | CONRHEIN NV | Washington County, PA | Gas Property | Feb 2026 |
| 502 | CONSOL | Greene County, PA | Gas Property | Feb 2026 |
| 503 | CONSOL | Greene County, PA | Gas Property | Dec 2025 |
| 504 | CONSOL | Greene County, PA | Gas Property | Feb 2026 |
| 505 | CONSOL GH | Greene County, PA | Gas Property | Feb 2026 |
| 506 | CONSOL MOR | Greene County, PA | Gas Property | Feb 2026 |
| 507 | CONSOL MOR44 | Washington County, PA | Gas Property | Feb 2026 |
| 508 | CONSOL NV | Washington County, PA | Oil & Gas Property | Feb 2026 |
| 509 | CONSOL NV57 | Washington County, PA | Gas Property | Feb 2026 |
| 510 | CONSOL PA | Greene County, PA | Gas Property | Dec 2025 |
| 511 | CONSOL PA COAL CO | Greene County, PA | Gas Property | Dec 2023 |
| 512 | CONSOL PENNSYLVANIA CO | Greene County, PA | Gas Property | Feb 2026 |
| 513 | CONSOL RHL11 | Greene County, PA | Gas Property | Feb 2026 |
| 514 | CONSOL USX | Greene County, PA | Oil & Gas Property | Feb 2026 |
| 515 | CONSOL WFN6 | Washington County, PA | Oil & Gas Property | Feb 2026 |
| 516 | CONSOL/USX | Greene County, PA | Oil & Gas Property | Feb 2026 |
| 517 | CONSOLIDATED RAIL CORP | Clearfield County, PA | Gas Property | Dec 2018 |
| 518 | CONSOLIDATED RAIL CORPORATION | Allegheny County, PA | Gas Property | Dec 2025 |
| 519 | CONSOLIDATION COAL CO | Allegheny County, PA | Oil & Gas Property | Dec 2025 |
| 520 | CONSOLIDATION COAL CO | Allegheny County, PA | Gas Property | Dec 2024 |
| 521 | CONSOLIDATION COAL CO | Monongalia County, WV | Gas Property | Dec 2019 |
| 522 | CONSTANTINE | Fayette County, PA | Oil & Gas Property | Dec 2025 |
| 523 | COOK | Venango County, PA | Oil Property | Dec 1998 |
| 524 | COOK 05 040 0 | Bradford County, PA | Gas Property | Jan 2026 |
| 525 | COOK FOREST STATE PARK | Clarion County, PA | Gas Property | Dec 2025 |
| 526 | COOK N SUS | Susquehanna County, PA | Gas Property | Feb 2026 |
| 527 | COOK UNIT | Jefferson County, PA | Gas Property | Feb 2026 |
| 528 | COOK UNIT 1 | Westmoreland County, PA | Gas Property | Feb 2026 |
| 529 | COOK/SMITH | Fayette County, PA | Oil & Gas Property | Dec 2025 |
| 530 | COOLEY | Bradford County, PA | Gas Property | Feb 2026 |
| 531 | COOLEY (05-266-0 | Bradford County, PA | Gas Property | Feb 2026 |
| 532 | COOLEY 05 004 01 P 1H OG WELL | Bradford County, PA | Gas Property | Feb 2026 |
| 533 | COON HOLLOW 904 | Potter County, PA | Gas Property | Feb 2026 |
| 534 | COOPER | Forest County, PA | Oil & Gas Property | Dec 2025 |
| 535 | COOPER 400 1H | Tioga County, PA | Gas Property | Feb 2026 |
| 536 | COOPER 590 | Greene County, PA | Oil & Gas Property | May 2020 |
| 537 | COOPER CHARLES | Washington County, PA | Oil & Gas Property | Dec 2011 |
| 538 | COP 2 | Elk County, PA | Gas Property | Feb 2026 |
| 539 | COP 324 | Clearfield County, PA | Gas Property | Feb 2026 |
| 540 | COP 6 | Elk County, PA | Gas Property | Feb 2026 |
| 541 | COP 7 | Clearfield County, PA | Gas Property | Feb 2026 |
| 542 | COP 8 | Clearfield County, PA | Gas Property | Feb 2026 |
| 543 | COP TR | Centre County, PA | Gas Property | Dec 2016 |
| 544 | COP TR | Centre County, PA | Gas Property | Feb 2026 |
| 545 | COP TR | Centre County, PA | Gas Property | Dec 2025 |
| 546 | COP TR 32 | Clearfield County, PA | Gas Property | Feb 2026 |
| 547 | COP TRACT | Clinton County, PA | Oil & Gas Property | Feb 2026 |
| 548 | COP TRACT | Clinton County, PA | Gas Property | Feb 2026 |
| 549 | COP TRACT | Clinton County, PA | Gas Property | Feb 2026 |
| 550 | COP TRACT | Lycoming County, PA | Gas Property | Feb 2026 |
| 551 | COP TRACT 322 PAD | Lycoming County, PA | Gas Property | Feb 2026 |
| 552 | COP TRACT 551 | Lycoming County, PA | Gas Property | Feb 2026 |
| 553 | COP TRACT 596 PAD | Tioga County, PA | Gas Property | Feb 2026 |
| 554 | COP TRACT 706 | Centre County, PA | Gas Property | Feb 2026 |
| 555 | COP TRACT 726 | Lycoming County, PA | Gas Property | Feb 2026 |
| 556 | COP TRACT 727 PAD 3 | Clinton County, PA | Gas Property | Feb 2026 |
| 557 | COP WT 2 | Elk County, PA | Gas Property | Feb 2026 |
| 558 | COP WT 2314 | McKean County, PA | Gas Property | Feb 2026 |
| 559 | COPELAND | Forest County, PA | Oil Property | Dec 2024 |
| 560 | CORA A BROWN | Armstrong County, PA | Gas Property | Dec 2025 |
| 561 | CORA BELLE TURNER | Westmoreland County, PA | Oil & Gas Property | Dec 2025 |
| 562 | CORBETT | Westmoreland County, PA | Gas Property | Feb 2026 |
| 563 | CORBETT | Clarion County, PA | Oil & Gas Property | Dec 2025 |
| 564 | CORBETT | Bradford County, PA | Gas Property | Feb 2026 |
| 565 | CORBIN | Indiana County, PA | Oil & Gas Property | Dec 2022 |
| 566 | CORBIN J | Susquehanna County, PA | Gas Property | Feb 2026 |
| 567 | COREY 07 089 0 | Susquehanna County, PA | Gas Property | Feb 2026 |
| 568 | CORNHILL C UNIT | Lycoming County, PA | Gas Property | Feb 2026 |
| 569 | CORNPLANTER | Forest County, PA | Oil Property | Dec 2024 |
| 570 | CORNWALL | Lycoming County, PA | Gas Property | Feb 2026 |
| 571 | CORNWALL B | Lycoming County, PA | Gas Property | Feb 2026 |
| 572 | CORNWALL C | McKean County, PA | Oil & Gas Property | Dec 2025 |
| 573 | CORNWALL EAST UNIT | Lycoming County, PA | Gas Property | Feb 2026 |
| 574 | CORNWALL NORTH UNIT | Lycoming County, PA | Gas Property | Feb 2026 |
| 575 | CORNWALL TURKEY UNIT | Lycoming County, PA | Gas Property | Feb 2026 |
| 576 | CORRIDONI | Indiana County, PA | Gas Property | Dec 2025 |
| 577 | CORRY | Greene County, PA | Gas Property | Feb 2026 |
| 578 | CORRY COUNTRY CLUB | Erie County, PA | Gas Property | Dec 1996 |
| 579 | CORSAIR | Greene County, PA | Gas Property | Feb 2026 |
| 580 | CORSON UNIT | Lycoming County, PA | Gas Property | Feb 2026 |
| 581 | COSGRAY | Greene County, PA | Gas Property | Dec 2025 |
| 582 | COSNER | Susquehanna County, PA | Gas Property | Feb 2026 |
| 583 | COSS | Mercer County, PA | Gas Property | Dec 2025 |
| 584 | COSTANZO UNIT | Washington County, PA | Oil & Gas Property | Feb 2026 |
| 585 | COTTON HANLON | Lycoming County, PA | Gas Property | Feb 2026 |
| 586 | COTTON HANLON 595 | Tioga County, PA | Gas Property | Feb 2026 |
| 587 | COULTER | Crawford County, PA | Oil & Gas Property | Dec 2025 |
| 588 | COULTER | Jefferson County, PA | Oil & Gas Property | Dec 2025 |
| 589 | COUNTY OF ARMSTRONG | Armstrong County, PA | Gas Property | Dec 2025 |
| 590 | COURTNEY | Mercer County, PA | Gas Property | Dec 2025 |
| 591 | COURTNEY | Tioga County, PA | Gas Property | Feb 2026 |
| 592 | COVEYTOWN | Sullivan County, PA | Gas Property | Feb 2026 |
| 593 | COVINGTON | Bradford County, PA | Gas Property | Feb 2026 |
| 594 | COVINGTON PROSPECT PAD R (WATKINS) 1 | Tioga County, PA | Gas Property | Feb 2026 |
| 595 | COWDEN | Washington County, PA | Oil & Gas Property | Feb 2026 |
| 596 | COWDEN | Washington County, PA | Oil & Gas Property | Feb 2026 |
| 597 | COWDEN | Washington County, PA | Oil & Gas Property | Feb 2026 |
| 598 | COWDEN WILLIAM UNIT | Washington County, PA | Gas Property | Feb 2026 |
| 599 | COYLE BRA | Bradford County, PA | Gas Property | Feb 2026 |
| 600 | COYLE SOUTH | Susquehanna County, PA | Gas Property | Feb 2026 |