| 601 | R B Robertson & Son Gas & Oil Co LP | New Bethlehem, PA 16242-0190 | Oil & Gas Operator | Dec 2024 |
| 602 | R Harris Gas & Oil Inc | Apollo, PA 15613-9636 | Oil & Gas Operator | Dec 2024 |
| 603 | R Joseph & Shelby J Maney | Warren, PA 16365-3670 | Oil & Gas Operator | Dec 2024 |
| 604 | Rabbitt C Michael | Chicora, PA 16025-1916 | Oil & Gas Operator | Dec 2015 |
| 605 | Ralph L Albright Drilling | Reno, NV 89511-7627 | Oil & Gas Operator | Dec 1991 |
| 606 | Randall Florence | Albion, PA 16401-9768 | Gas Operator | Dec 2010 |
| 607 | Range Opr Co | Yatesboro, PA 16263-0235 | Oil & Gas Operator | Dec 1999 |
| 608 | Range Resources Appalachia LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Jun 2025 |
| 609 | Rannuff Oil & Gas Co | Waynesburg, PA 15370-1437 | Oil & Gas Operator | Dec 2024 |
| 610 | RC Southwell Oil LLC | Warren, PA 16365 | Oil & Gas Operator | Dec 2024 |
| 611 | Re Fox & Assoc Inc | Pittsburgh, PA 15243-0130 | Gas Operator | Dec 1999 |
| 612 | Re Gas Dev LLC | State College, PA 16801-7085 | Oil & Gas Operator | Sep 2018 |
| 613 | Reclusive Energy LLC | Gifford, PA 16732 | Oil & Gas Operator | Dec 2020 |
| 614 | Red Jacket Energy LLC | Roulette, PA 16746-1408 | Oil & Gas Operator | Dec 2024 |
| 615 | Red Oak Energy LLC | Clarksburg, PA 15725-8824 | Oil & Gas Operator | Dec 2024 |
| 616 | Red Valley Resources LLC | McCordsville, IN 46055-0294 | Oil Operator | Dec 2015 |
| 617 | Redmill Drilling | Kittanning, PA 16201-7123 | Oil & Gas Operator | Jul 2025 |
| 618 | Reichard Equip Co | New Bethlehem, PA 16242-1936 | Gas Operator | Dec 2021 |
| 619 | Rejiss Assoc | Braddock, PA 15104-1948 | Oil & Gas Operator | Dec 2009 |
| 620 | Rejiss Assoc Holdings LLC | Braddock, PA 15104-1948 | Gas Operator | Dec 2024 |
| 621 | Remington Capital Holdings Inc | North East, PA 16428-0026 | Oil & Gas Operator | Dec 2022 |
| 622 | Remnant Group Inc | Pittsburgh, PA 15238-1359 | Oil & Gas Operator | Dec 2013 |
| 623 | Rensma Steven E | Titusville, PA 16354-5304 | Oil Operator | Dec 1993 |
| 624 | Repsol Oil & Gas USA, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 625 | Return Oil Corp | Oil City, PA 16301-0564 | Oil Operator | Dec 1992 |
| 626 | Rex Drummond | Conneaut, OH 44030-9678 | Oil & Gas Operator | Dec 2019 |
| 627 | Rex Energy Operating Corp. | State College, PA 16801 | Oil & Gas Operator | Jun 2012 |
| 628 | Rhoades Oil Co | Tulsa, OK 74136-5575 | Oil & Gas Operator | Aug 2013 |
| 629 | Rice Drilling B LLC | Canonsburg, PA 15317-5851 | Gas Operator | Jul 2025 |
| 630 | Richard B Herzog | Bradford, PA 16701-3619 | Oil Operator | Dec 2007 |
| 631 | Richard G Boarts | Ford City, PA 16226-7001 | Gas Operator | Dec 2012 |
| 632 | Richard H Burkland | Lemont Furnace, PA 15456-0073 | Oil & Gas Operator | Dec 2012 |
| 633 | Richards Drilling Co | Venango, PA 16440-1123 | Oil & Gas Operator | Dec 2015 |
| 634 | Rick & Sons Oil LLC | Warren, PA 16365-3561 | Oil & Gas Operator | Dec 2024 |
| 635 | Ridgeview Gas & Oil Inc | Templeton, PA 16259-4505 | Oil & Gas Operator | Dec 2024 |
| 636 | Ridgeview Gas Co | Templeton, PA 16259-4505 | Oil & Gas Operator | Dec 2010 |
| 637 | Ristau Ricky J | Warren, PA 16365-3560 | Oil & Gas Operator | Dec 2024 |
| 638 | River Ridge Gravel Co | Meadville, PA 16335-9149 | Oil Operator | Dec 2024 |
| 639 | RJ Schreiner SR | Freedom, PA 15042-9353 | Oil & Gas Operator | Dec 2015 |
| 640 | Roach & Assoc Inc | Pittsburgh, PA 15228-1924 | Gas Operator | Dec 2024 |
| 641 | Robert J & Wilma J Webster | Edinboro, PA 16412-4928 | Gas Operator | Dec 2018 |
| 642 | Rockdale Marcellus LLC | Canonsburg, PA 15317 | Gas Operator | Apr 2022 |
| 643 | Rocksauce Opr LLC | Canonsburg, PA 15317-3906 | Oil & Gas Operator | Dec 2024 |
| 644 | Roger K Dunham | Sheffield, PA 16347-0145 | Oil Operator | Dec 2016 |
| 645 | Ronald L Nick | Lucinda, PA 16235-3006 | Gas Operator | Dec 2023 |
| 646 | Roof Carl | Indiana, PA 15701 | Gas Operator | Dec 2024 |
| 647 | Roulette Oil & Gas LLC | Shinglehouse, PA 16748-3406 | Oil & Gas Operator | Jul 2025 |
| 648 | RS Gas Co Inc | Sprankle Mills, PA 15776-8312 | Gas Operator | Dec 2024 |
| 649 | Ruffner Clair L III | Marion Center, PA 15759-7818 | Gas Operator | Dec 2024 |
| 650 | Russ Holden Well SVC | Sheffield, PA 16347-2904 | Oil & Gas Operator | Dec 2024 |
| 651 | S & S Oil | Ponca City, OK 74601 | Oil & Gas Operator | Dec 2009 |
| 652 | S & T SVC & Supply Inc | Pleasantville, PA 16341-2817 | Oil & Gas Operator | Dec 2024 |
| 653 | Samson Exploration LLC | Tulsa, OK 74101 | Oil & Gas Operator | Aug 2025 |
| 654 | Samson Res Co | Tulsa, OK 74103-3103 | Gas Operator | Jan 2015 |
| 655 | Sandstone Dev LLC | Bradford, PA 16701-2922 | Oil & Gas Operator | Dec 2024 |
| 656 | Sandstone Resources | Saint Joseph, MO 64506 | Oil & Gas Operator | Dec 1995 |
| 657 | Schneider Edward H | Bridgeville, PA 15017-2165 | Gas Operator | Dec 2024 |
| 658 | Schrader Willard C | Tionesta, PA 16353-8114 | Oil & Gas Operator | Dec 2024 |
| 659 | Schrecengost Fred M | Sligo, PA 16255-0216 | Oil & Gas Operator | Dec 2016 |
| 660 | Schreiner Oil & Gas Inc | Prescott, AZ 86303 | Oil & Gas Operator | Dec 2023 |
| 661 | Scorpio Energy Inc | Sheffield, PA 16347-0929 | Oil & Gas Operator | Dec 2024 |
| 662 | Seneca Resources Co LLC | Cranberry Township, PA 16066 | Oil & Gas Operator | Jul 2025 |
| 663 | September Corp | Titusville, PA 16354-6833 | Oil & Gas Operator | Dec 2024 |
| 664 | Sergeant Gas Co Inc | Wilcox, PA 15870-1810 | Oil & Gas Operator | Dec 2024 |
| 665 | Shaner W G | Longmont, CO 80503 | Gas Operator | Dec 2021 |
| 666 | Shawmut Production Corporation | Pittsburgh, PA 15219-1913 | Oil & Gas Operator | Jan 2003 |
| 667 | Shearer James I | Blairsville, PA 15717-0337 | Oil & Gas Operator | Dec 2003 |
| 668 | Shelex Drilling Inc | Lexington, KY 40523 | Oil & Gas Operator | Dec 2024 |
| 669 | Shelly Oil & Gas Inc | Avonmore, PA 15618-9748 | Gas Operator | Dec 2024 |
| 670 | Simon Of Bolivar Enterprises Inc | Cuba, NY 14727 | Oil & Gas Operator | Dec 2024 |
| 671 | Simpson Gary H | Albion, PA 16401-8008 | Gas Operator | Dec 2014 |
| 672 | SK Opr Inc | Cabot, PA 16023-1250 | Gas Operator | Dec 2024 |
| 673 | Sliverville Oil Co LLC | Bradford, PA 16701-2770 | Oil & Gas Operator | Dec 2024 |
| 674 | SLT Production LLC | Sheffield, PA 16347-0547 | Oil & Gas Operator | Dec 2024 |
| 675 | SM Energy | Denver, CO 80203-4361 | Gas Operator | Feb 2015 |
| 676 | Sme Well SVC Inc | Herman, PA 16039-0156 | Oil & Gas Operator | Dec 2024 |
| 677 | Snee & Eberly & People Natural Gas | Unknown, PA 15000 | Gas Operator | Dec 1986 |
| 678 | Snyder Bros Inc | Kittanning, PA 16201 | Oil & Gas Operator | Jul 2025 |
| 679 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 680 | Society Of Bros In Pa Inc | Farmington, PA 15437-0240 | Gas Operator | Dec 2024 |
| 681 | Somerset Oil & Gas Company | Portland, TX 78374 | Oil & Gas Operator | Dec 2006 |
| 682 | Songer Harriett R | Brookville, PA 15825-5367 | Oil & Gas Operator | Dec 2010 |
| 683 | South Shore Energy LLC | Geneva, OH 44041 | Oil & Gas Operator | Dec 2024 |
| 684 | Southwell Russell C | Warren, PA 16365-3686 | Oil & Gas Operator | Dec 2022 |
| 685 | Southwell William R | Warren, PA 16365-1259 | Oil & Gas Operator | Dec 2017 |
| 686 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 687 | Spartan Resource MGMT Corp | Rural Valley, PA 16249-0326 | Gas Operator | Dec 2024 |
| 688 | Star Energy Inc | Dayton, PA 16222-4325 | Oil & Gas Operator | Dec 2024 |
| 689 | Stateside Energy Group LLC | North Miami Beach, FL 33435 | Oil & Gas Operator | Dec 2024 |
| 690 | STD Steel | Latrobe, PA 15650-0071 | Oil & Gas Operator | Dec 2002 |
| 691 | Stedman Energy Inc | Chautauqua, NY 14722 | Oil & Gas Operator | Dec 2024 |
| 692 | Stephenson Group Natural Gas Co | Smicksburg, PA 16256-1710 | Gas Operator | Dec 2020 |
| 693 | Stephenson Mark M | Smicksburg, PA 16256-1710 | Gas Operator | Dec 2009 |
| 694 | Sterling Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2015 |
| 695 | Stewart Drilling Program | Home, PA 15747-9801 | Oil & Gas Operator | Dec 2014 |
| 696 | Stewart Inc | Ringling, OK 73456 | Oil & Gas Operator | Jun 2025 |
| 697 | Stiglitz Raymond J | Franklin, PA 16323-7760 | Oil & Gas Operator | Dec 2013 |
| 698 | STL Resources LLC | Sewickley, PA 15143-8859 | Gas Operator | Jul 2025 |
| 699 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 700 | Stone Ridge Energy LLC | Uniontown, PA 15401-6831 | Oil & Gas Operator | Jul 2025 |