| 501 | RIPPLE | Armstrong County, PA | Gas Property | Dec 2025 |
| 502 | ROARING RUN | Armstrong County, PA | Gas Property | Dec 2025 |
| 503 | ROBERT | Armstrong County, PA | Gas Property | Dec 2025 |
| 504 | ROBERT | Armstrong County, PA | Gas Property | Dec 2025 |
| 505 | ROBERT | Armstrong County, PA | Gas Property | Dec 2025 |
| 506 | ROBERT | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 507 | ROBERT C. CRISSMAN | Armstrong County, PA | Gas Property | Dec 2025 |
| 508 | ROBERT E PATRICK | Armstrong County, PA | Gas Property | Dec 2025 |
| 509 | ROBERT HOUSER | Armstrong County, PA | Gas Property | Dec 2025 |
| 510 | ROBERT L. CALHOUN | Armstrong County, PA | Gas Property | Dec 2025 |
| 511 | ROBERTSON | Armstrong County, PA | Gas Property | Dec 2025 |
| 512 | ROBINSON | Armstrong County, PA | Gas Property | Dec 2025 |
| 513 | ROCHESTER & PGH COAL | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 514 | ROCHESTER & PITTSBURG | Armstrong County, PA | Gas Property | Dec 2025 |
| 515 | ROCHESTER & PITTSBURGH COAL CO | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 516 | ROCK FURNA | Armstrong County, PA | Gas Property | Dec 2025 |
| 517 | ROGER H CLAYPOOLE ETUX | Armstrong County, PA | Gas Property | Mar 2026 |
| 518 | ROLLING HILLS | Armstrong County, PA | Gas Property | Mar 2026 |
| 519 | ROSS | Armstrong County, PA | Gas Property | Dec 2025 |
| 520 | RUPERT | Armstrong County, PA | Gas Property | Dec 2025 |
| 521 | RUPERT | Armstrong County, PA | Gas Property | Dec 2025 |
| 522 | RUPP | Armstrong County, PA | Gas Property | Dec 2025 |
| 523 | RUPP | Armstrong County, PA | Gas Property | Dec 2025 |
| 524 | RUPP | Armstrong County, PA | Gas Property | Dec 2025 |
| 525 | RUSSELL L JR & GWEN | Armstrong County, PA | Gas Property | Dec 2025 |
| 526 | RUTH ISEMAN | Armstrong County, PA | Gas Property | Mar 2026 |
| 527 | RUTH L KIMMEL | Armstrong County, PA | Gas Property | Dec 2025 |
| 528 | S B CATHCART 174A | Armstrong County, PA | Gas Property | Dec 2025 |
| 529 | S F BOOHER | Armstrong County, PA | Gas Property | Dec 2025 |
| 530 | S H BOLLINGER | Armstrong County, PA | Gas Property | Dec 2025 |
| 531 | SAGC | Armstrong County, PA | Gas Property | Mar 2026 |
| 532 | SALTSBURG | Armstrong County, PA | Gas Property | Dec 2025 |
| 533 | SAMOSKY | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 534 | SAMUEL BEYER HEIRS | Armstrong County, PA | Gas Property | Dec 2025 |
| 535 | SAMUEL W MONTGOMERY | Armstrong County, PA | Gas Property | Mar 2026 |
| 536 | SCHAEFFER | Armstrong County, PA | Gas Property | Dec 2025 |
| 537 | SCHALL | Armstrong County, PA | Gas Property | Dec 2025 |
| 538 | SCHENLEY | Armstrong County, PA | Gas Property | Dec 2025 |
| 539 | SCHERCENGOST-TRACT | Armstrong County, PA | Gas Property | Dec 2025 |
| 540 | SCHRECENGOST | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 541 | SCHRECENGOST | Armstrong County, PA | Oil & Gas Property | Mar 2026 |
| 542 | SCHULTZ | Armstrong County, PA | Gas Property | Dec 2025 |
| 543 | SCOTT | Armstrong County, PA | Gas Property | Dec 2025 |
| 544 | SCOTT REARICK | Armstrong County, PA | Gas Property | Dec 2025 |
| 545 | SEDWICK HEIGHTS | Armstrong County, PA | Gas Property | Dec 2025 |
| 546 | SGL-247A-07 | Armstrong County, PA | Gas Property | Dec 2025 |
| 547 | SHARISKY 1 | Armstrong County, PA | Gas Property | Mar 2026 |
| 548 | SHAWMUT DEVELOPMENT CORP | Armstrong County, PA | Gas Property | Dec 2025 |
| 549 | SHAWMUT DEVELOPMENT CORP | Armstrong County, PA | Gas Property | Dec 2025 |
| 550 | SHEASLEY | Armstrong County, PA | Gas Property | Dec 2025 |
| 551 | SHEASLEY | Armstrong County, PA | Gas Property | Dec 2025 |
| 552 | SHELLHAMMER | Armstrong County, PA | Gas Property | Dec 2025 |
| 553 | SHERMAN 567 | Armstrong County, PA | Gas Property | Dec 2025 |
| 554 | SHICK | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 555 | SHILLING | Armstrong County, PA | Gas Property | Dec 2025 |
| 556 | SHIREY | Armstrong County, PA | Oil Property | Dec 2025 |
| 557 | SHIREY | Armstrong County, PA | Gas Property | Dec 2025 |
| 558 | SIGWORTH | Armstrong County, PA | Gas Property | Dec 2025 |
| 559 | SMAIL | Armstrong County, PA | Gas Property | Dec 2025 |
| 560 | SMELTZER | Armstrong County, PA | Gas Property | Mar 2026 |
| 561 | SMICIK | Armstrong County, PA | Gas Property | Dec 2025 |
| 562 | SMITH | Armstrong County, PA | Gas Property | Dec 2025 |
| 563 | SMITH/GEORGE 00 | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 564 | SNYDER-BOWERSOX | Armstrong County, PA | Gas Property | Dec 2025 |
| 565 | SPENCER | Armstrong County, PA | Gas Property | Dec 2025 |
| 566 | SPORTSMAN | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 567 | SPRANKLE | Armstrong County, PA | Gas Property | Dec 2025 |
| 568 | SPRING CHURCH UNIT | Armstrong County, PA | Gas Property | Mar 2026 |
| 569 | ST GAME LANDS-137 | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 570 | STANKAY | Armstrong County, PA | Gas Property | Dec 2025 |
| 571 | STATE GAME | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 572 | STEPHEN J. JAWORSKI, ETUX | Armstrong County, PA | Gas Property | Dec 2025 |
| 573 | STEROSKY | Armstrong County, PA | Gas Property | Dec 2025 |
| 574 | STEWART | Armstrong County, PA | Gas Property | Dec 2025 |
| 575 | STITT | Armstrong County, PA | Gas Property | Dec 2025 |
| 576 | STIVENSON | Armstrong County, PA | Gas Property | Dec 2025 |
| 577 | STONE HOUSE | Armstrong County, PA | Gas Property | Mar 2026 |
| 578 | STONIS | Armstrong County, PA | Gas Property | Mar 2026 |
| 579 | STURGEON | Armstrong County, PA | Gas Property | Dec 2025 |
| 580 | STURGEON | Armstrong County, PA | Gas Property | Dec 2025 |
| 581 | SUMMIT COAL CORP | Armstrong County, PA | Gas Property | Dec 2025 |
| 582 | SUNNYSIDE | Armstrong County, PA | Gas Property | Mar 2026 |
| 583 | SWANK | Armstrong County, PA | Gas Property | Mar 2026 |
| 584 | SWANK 43 | Armstrong County, PA | Gas Property | Dec 2025 |
| 585 | SZYMANSKI | Armstrong County, PA | Gas Property | Dec 2025 |
| 586 | T A MCKEE | Armstrong County, PA | Gas Property | Mar 2026 |
| 587 | T M DICE | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 588 | T W P G & O CO (BREDIN 448A | Armstrong County, PA | Gas Property | Dec 2018 |
| 589 | TERRY 59 | Armstrong County, PA | Gas Property | Mar 2026 |
| 590 | TERRY BOWSER A UNIT | Armstrong County, PA | Gas Property | Mar 2026 |
| 591 | THE JOY CO | Armstrong County, PA | Gas Property | Dec 2025 |
| 592 | THOMAS A SMITH ETUX | Armstrong County, PA | Gas Property | Dec 2025 |
| 593 | THOMAS F & DEVOTA M HUFF | Armstrong County, PA | Gas Property | Dec 2025 |
| 594 | THOMAS HOLLOBAUGH | Armstrong County, PA | Gas Property | Dec 2025 |
| 595 | THOMAS J SMITH ETUX | Armstrong County, PA | Gas Property | Dec 2025 |
| 596 | THOMAS R ELLIOTT ETUX | Armstrong County, PA | Gas Property | Dec 2025 |
| 597 | THOMAS S | Armstrong County, PA | Gas Property | Dec 2025 |
| 598 | TICKLE FARM | Armstrong County, PA | Gas Property | Mar 2026 |
| 599 | TOWNSEND | Armstrong County, PA | Gas Property | Dec 2025 |
| 600 | TRAISTER 00 | Armstrong County, PA | Gas Property | Dec 2025 |