| 501 | Phillips Prod Co | Warrendale, PA 15086-7537 | Oil & Gas Operator | Dec 2011 |
| 502 | Phoenix Energy LLC | Warren, PA 16365-2302 | Oil & Gas Operator | Dec 2023 |
| 503 | Phoenix Energy Prod Inc | Freeport, PA 16229-1126 | Oil & Gas Operator | Dec 2023 |
| 504 | Pierce & Petersen | Warren, PA 16365 | Oil & Gas Operator | Dec 2023 |
| 505 | Pierce James E | Warren, PA 16365-0627 | Oil & Gas Operator | Dec 2011 |
| 506 | Pin Oak Energy Partners LLC | Akron, OH 44311 | Oil & Gas Operator | Jan 2024 |
| 507 | Pine City Gas LLC | Lucinda, PA 16235-0060 | Oil & Gas Operator | Dec 2023 |
| 508 | Pine Ridge Energy | Sugar Grove, PA 16350-6934 | Oil & Gas Operator | Dec 2021 |
| 509 | Pine Valley Resources Inc | West Seneca, NY 14224-2244 | Oil & Gas Operator | Dec 1991 |
| 510 | Plants & Goodwin Inc | Bradford, PA 16701-3733 | Oil & Gas Operator | Dec 2018 |
| 511 | PNB Petrol Haddad & Brooks Inc | Atlanta, GA 30305-1555 | Oil & Gas Operator | Dec 1989 |
| 512 | Powell Donovan L | Spraggs, PA 15362-2019 | Gas Operator | Dec 2023 |
| 513 | Power Gas MKT & Trans Inc | Akron, OH 44311-1062 | Oil & Gas Operator | Dec 2008 |
| 514 | PPG Oper LLC | State College, PA 16801-7569 | Gas Operator | Jan 2024 |
| 515 | PPP Future Dev Inc | Alexander, NY 14005 | Oil & Gas Operator | Dec 2023 |
| 516 | Puma Energy Inc | Kerrville, TX 78028-9300 | Gas Operator | Dec 1999 |
| 517 | Pve Oil Corp Inc | Blairsville, PA 15717-7961 | Oil & Gas Operator | Dec 2023 |
| 518 | Quail Energy Corp | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 2010 |
| 519 | Quaker State Corporation | Houston, TX 77002-2806 | Oil & Gas Operator | Dec 2013 |
| 520 | Questa Petro Co | Pittsburgh, PA 15241-0863 | Oil & Gas Operator | Dec 2023 |
| 521 | R & N Resources LLC | Bear Lake, PA 16402-2926 | Oil & Gas Operator | Dec 2023 |
| 522 | R & R Oil & Gas LLC | Big Spring, TX 79720 | Oil & Gas Operator | Dec 2023 |
| 523 | R B Robertson & Son Gas & Oil Co LP | New Bethlehem, PA 16242-0190 | Oil & Gas Operator | Dec 2022 |
| 524 | R Harris Gas & Oil Inc | Apollo, PA 15613-9636 | Oil & Gas Operator | Dec 2023 |
| 525 | R Joseph & Shelby J Maney | Warren, PA 16365-3670 | Oil & Gas Operator | Dec 2023 |
| 526 | Rabbitt C Michael | Chicora, PA 16025-1916 | Oil & Gas Operator | Dec 2015 |
| 527 | Ralph L Albright Drilling | Reno, NV 89511-7627 | Oil & Gas Operator | Dec 1991 |
| 528 | Randall Florence | Albion, PA 16401-9768 | Gas Operator | Dec 2010 |
| 529 | Range Opr Co | Yatesboro, PA 16263-0235 | Oil & Gas Operator | Dec 1999 |
| 530 | Range Resources Appalachia LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Jan 2024 |
| 531 | Rannuff Oil & Gas Co | Waynesburg, PA 15370-1437 | Oil & Gas Operator | Dec 2023 |
| 532 | RC Southwell Oil LLC | Warren, PA 16365 | Oil & Gas Operator | Dec 2023 |
| 533 | Re Fox & Assoc Inc | Pittsburgh, PA 15243-0130 | Gas Operator | Dec 1999 |
| 534 | Re Gas Dev LLC | State College, PA 16801-7085 | Oil & Gas Operator | Sep 2018 |
| 535 | Reclusive Energy LLC | Gifford, PA 16732 | Oil & Gas Operator | Dec 2020 |
| 536 | Red Jacket Energy LLC | Roulette, PA 16746-1408 | Oil & Gas Operator | Dec 2021 |
| 537 | Red Oak Energy LLC | Clarksburg, PA 15725-8824 | Oil & Gas Operator | Dec 2023 |
| 538 | Red Valley Resources LLC | McCordsville, IN 46055-0294 | Oil Operator | Dec 2015 |
| 539 | Redmill Drilling | Kittanning, PA 16201-7123 | Oil & Gas Operator | Jan 2024 |
| 540 | Rejiss Assoc | Braddock, PA 15104-1948 | Oil & Gas Operator | Dec 2009 |
| 541 | Rejiss Assoc Holdings LLC | Braddock, PA 15104-1948 | Gas Operator | Dec 2023 |
| 542 | Remington Capital Holdings Inc | North East, PA 16428-0026 | Oil & Gas Operator | Dec 2022 |
| 543 | Remnant Group Inc | Pittsburgh, PA 15238-1359 | Oil & Gas Operator | Dec 2013 |
| 544 | Rensma Steven E | Titusville, PA 16354-5304 | Oil Operator | Dec 1993 |
| 545 | Repsol Oil & Gas USA, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Apr 2024 |
| 546 | Return Oil Corp | Oil City, PA 16301-0564 | Oil Operator | Dec 1992 |
| 547 | Rex Drummond | Conneaut, OH 44030-9678 | Oil & Gas Operator | Dec 2019 |
| 548 | Rex Energy Operating Corp. | State College, PA 16801 | Oil & Gas Operator | Jun 2012 |
| 549 | Rhoades Oil Co | Tulsa, OK 74136-5575 | Oil & Gas Operator | Aug 2013 |
| 550 | Rice Drilling B LLC | Canonsburg, PA 15317-5851 | Gas Operator | Jan 2024 |
| 551 | Richard B Herzog | Bradford, PA 16701-3619 | Oil Operator | Dec 2007 |
| 552 | Richard G Boarts | Ford City, PA 16226-7001 | Gas Operator | Dec 2012 |
| 553 | Richard H Burkland | Lemont Furnace, PA 15456-0073 | Oil & Gas Operator | Dec 2012 |
| 554 | Richards Drilling Co | Venango, PA 16440-1123 | Oil & Gas Operator | Dec 2015 |
| 555 | Rick & Sons Oil LLC | Warren, PA 16365-3561 | Oil & Gas Operator | Dec 2023 |
| 556 | Ridgeview Gas & Oil Inc | Templeton, PA 16259-4505 | Oil & Gas Operator | Dec 2023 |
| 557 | Ridgeview Gas Co | Templeton, PA 16259-4505 | Oil & Gas Operator | Dec 2010 |
| 558 | Ristau Ricky J | Warren, PA 16365-3560 | Oil & Gas Operator | Dec 2023 |
| 559 | River Ridge Gravel Co | Meadville, PA 16335-9149 | Oil Operator | Dec 2023 |
| 560 | RJ Schreiner SR | Freedom, PA 15042-9353 | Oil & Gas Operator | Dec 2015 |
| 561 | Rockdale Marcellus LLC | Canonsburg, PA 15317 | Gas Operator | Apr 2022 |
| 562 | Rocksauce Opr LLC | Canonsburg, PA 15317-3906 | Oil & Gas Operator | Dec 2023 |
| 563 | Roger K Dunham | Sheffield, PA 16347-0145 | Oil Operator | Dec 2016 |
| 564 | Ronald L Nick | Lucinda, PA 16235-3006 | Gas Operator | Dec 2023 |
| 565 | Roulette Oil & Gas LLC | Shinglehouse, PA 16748 | Oil & Gas Operator | Jan 2024 |
| 566 | RS Gas Co Inc | Sprankle Mills, PA 15776-8312 | Gas Operator | Dec 2023 |
| 567 | Ruffner Clair L III | Marion Center, PA 15759-7818 | Gas Operator | Dec 2023 |
| 568 | Russ Holden Well SVC | Sheffield, PA 16347-2904 | Oil & Gas Operator | Dec 2019 |
| 569 | S & S Oil | Ponca City, OK 74601 | Oil & Gas Operator | Dec 2009 |
| 570 | S & T SVC & Supply Inc | Pleasantville, PA 16341-2817 | Oil & Gas Operator | Dec 2020 |
| 571 | Samson Exploration LLC | Tulsa, OK 74101 | Oil & Gas Operator | Feb 2024 |
| 572 | Samson Res Co | Tulsa, OK 74103-3103 | Gas Operator | Jan 2015 |
| 573 | Sandstone Dev LLC | Bradford, PA 16701-2922 | Oil & Gas Operator | Dec 2023 |
| 574 | Sandstone Resources | Saint Joseph, MO 64506 | Oil & Gas Operator | Dec 1995 |
| 575 | Schrader Willard C | Tionesta, PA 16353-8114 | Oil & Gas Operator | Dec 2023 |
| 576 | Schrecengost Fred M | Sligo, PA 16255-0216 | Oil & Gas Operator | Dec 2016 |
| 577 | Schreiner Oil & Gas Inc | Prescott, AZ 86303 | Oil & Gas Operator | Dec 2021 |
| 578 | Scorpio Energy Inc | Sheffield, PA 16347-0929 | Oil & Gas Operator | Dec 2023 |
| 579 | Seneca Resources Co LLC | Cranberry Township, PA 16066 | Oil & Gas Operator | Jan 2024 |
| 580 | September Corp | Titusville, PA 16354-6833 | Oil & Gas Operator | Dec 2023 |
| 581 | Sergeant Gas Co Inc | Wilcox, PA 15870-1810 | Oil & Gas Operator | Dec 2023 |
| 582 | Shaner W G | Longmont, CO 80503 | Gas Operator | Dec 2021 |
| 583 | Shawmut Production Corporation | Pittsburgh, PA 15219-1913 | Oil & Gas Operator | Jan 2003 |
| 584 | Shearer James I | Blairsville, PA 15717-0337 | Oil & Gas Operator | Dec 2003 |
| 585 | Shelex Drilling Inc | Lexington, KY 40523 | Oil & Gas Operator | Dec 2023 |
| 586 | Shelly Oil & Gas Inc | Avonmore, PA 15618-9748 | Gas Operator | Dec 2023 |
| 587 | Simon Of Bolivar Enterprises Inc | Shinglehouse, PA 16748 | Oil & Gas Operator | Dec 2022 |
| 588 | SK Opr Inc | Cabot, PA 16023-1250 | Gas Operator | Dec 2023 |
| 589 | Sliverville Oil Co LLC | Bradford, PA 16701-2770 | Oil & Gas Operator | Dec 2023 |
| 590 | SLT Production LLC | Sheffield, PA 16347-0547 | Oil & Gas Operator | Dec 2023 |
| 591 | SM Energy | Denver, CO 80203-4361 | Gas Operator | Feb 2015 |
| 592 | Sme Well SVC Inc | Herman, PA 16039-0156 | Oil & Gas Operator | Dec 2022 |
| 593 | Snee & Eberly & People Natural Gas | Unknown, PA 15000 | Gas Operator | Dec 1986 |
| 594 | Snyder Bros Inc | Kittanning, PA 16201 | Oil & Gas Operator | Jan 2024 |
| 595 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 596 | Somerset Oil & Gas Company | Portland, TX 78374 | Oil & Gas Operator | Dec 2006 |
| 597 | Songer Harriett R | Brookville, PA 15825-5367 | Oil & Gas Operator | Dec 2010 |
| 598 | South Shore Energy LLC | Geneva, OH 44041-0800-0800 | Oil & Gas Operator | Dec 2023 |
| 599 | Southwell Russell C | Warren, PA 16365-3686 | Oil & Gas Operator | Dec 2022 |
| 600 | Southwell William R | Warren, PA 16365-1259 | Oil & Gas Operator | Dec 2017 |