| 1001 | Pioneer Drilling Co | Payne, OH 45880 | Oil & Gas Operator | Dec 1993 |
| 1002 | Pioneer Resources Inc | Phillipsburg, KS 67661 | Oil & Gas Operator | Oct 2020 |
| 1003 | Pipes Pursie E | MT Vernon, IL 62864 | Oil & Gas Operator | Dec 2014 |
| 1004 | Pittencrieff America Inc | Abilene, TX 79608 | Oil & Gas Operator | Feb 2003 |
| 1005 | Pleasant Hill Oil Co | Carrollton, OH 44615 | Oil Operator | Dec 2006 |
| 1006 | Poling Albert | Logan, OH 43138 | Oil Operator | Dec 2024 |
| 1007 | Pominex Inc | Cols, OH 43214 | Oil & Gas Operator | Dec 1988 |
| 1008 | Ponderosa Consulting Services Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2024 |
| 1009 | Poorboy Exploration LLC | Caldwell, OH 43724-9134 | Oil & Gas Operator | Dec 2024 |
| 1010 | Portage Exploration Co In | Salem, IL 62881 | Oil & Gas Operator | Dec 2004 |
| 1011 | Portage Resources Inc | Warren, OH 44484 | Oil & Gas Operator | Dec 2015 |
| 1012 | Porter Brothers | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1995 |
| 1013 | Porter Petroleum | Hopewell, OH 43746 | Oil & Gas Operator | Dec 2021 |
| 1014 | Porter Petroleum Of Seo LLC | Hopewell, OH 43746 | Oil Operator | Dec 2024 |
| 1015 | Poston Operating Co Inc | Ashley, OH 43003 | Oil & Gas Operator | Dec 2003 |
| 1016 | Pottmeyer David | Fleming, OH 43729 | Oil & Gas Operator | Dec 2024 |
| 1017 | Power Gas Marketing & Trans | Akron, OH 44311-1057 | Oil & Gas Operator | Dec 2005 |
| 1018 | Power Resour Oper Co Inc | Canton, OH 44718 | Oil & Gas Operator | Dec 2005 |
| 1019 | PPG Industries Inc | Barberton, OH 44203 | Oil & Gas Operator | Dec 2004 |
| 1020 | Prime Energy Corp | Charleston, WV 25301-1707 | Oil & Gas Operator | Sep 2015 |
| 1021 | Prime Time Energy Investment Inc | MT Vernon, OH 43050 | Oil & Gas Operator | Dec 2024 |
| 1022 | Proco | Wooster, OH 44691 | Oil Operator | Dec 1988 |
| 1023 | Profit Energy Company | Jerusalem, OH 43747 | Oil & Gas Operator | Dec 2024 |
| 1024 | Progressive Oil & Gas | Moxahala, OH 43761 | Oil & Gas Operator | Dec 2024 |
| 1025 | Protege Energy II LLC | Tulsa, OK 74135-3252 | Oil & Gas Operator | Dec 2013 |
| 1026 | Protege Energy III LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2024 |
| 1027 | Provident Oil & Gas Co | Akron, OH 44313 | Oil & Gas Operator | Dec 1989 |
| 1028 | Provident Oil & Gas Corp | Akron, OH 44333 | Oil & Gas Operator | Dec 1991 |
| 1029 | Putnam, William H | Marietta, OH 45750 | Oil & Gas Operator | Dec 2022 |
| 1030 | Pyramid Oil & Gas Co | Lake Geneva, WI 53147 | Oil & Gas Operator | Dec 2005 |
| 1031 | Quadrant Exploration Inc | Marietta, OH 45750 | Oil & Gas Operator | Dec 2000 |
| 1032 | Quail Energy Corp | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 2010 |
| 1033 | Quaker State Oil Ref Corp | North Canton, OH 44720-1541 | Oil & Gas Operator | Dec 1994 |
| 1034 | Quality Oil & Gas Corp | Alliance, OH 44601 | Oil & Gas Operator | Dec 2024 |
| 1035 | Questa Petroleum Co | Greensburg, PA 15601 | Oil & Gas Operator | Dec 2006 |
| 1036 | R & B Enterprises USA Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 2024 |
| 1037 | R & E Enterprises | Paris, OH 44669 | Oil & Gas Operator | Dec 1995 |
| 1038 | R & J Well Service LLC | Utica, OH 43080 | Oil & Gas Operator | Dec 2024 |
| 1039 | R & R Oil & Gas LLC | Big Spring, TX 79720 | Oil & Gas Operator | Dec 2024 |
| 1040 | R & W Energy | Rockwall, TX 75087 | Oil & Gas Operator | Dec 1985 |
| 1041 | R C Poling Co Inc | Junction City, OH 43748 | Oil & Gas Operator | Dec 2024 |
| 1042 | R E Gas Development LLC | State College, PA 16801 | Oil & Gas Operator | Sep 2018 |
| 1043 | R H Penick Co LTD | Baltimore, OH 43105 | Oil & Gas Operator | Dec 2024 |
| 1044 | R I G Drilling Inc | Fredericktown, OH 43019 | Oil & Gas Operator | Dec 1993 |
| 1045 | R Wolfe Oil & Gas LLC | Athens, OH 45701 | Oil & Gas Operator | Dec 2024 |
| 1046 | R. D. Wiles, Inc. | Wooster, OH 44691 | Oil & Gas Operator | Dec 2024 |
| 1047 | Rab Oil & Gas LLC | Garrettsville, OH 44231 | Oil & Gas Operator | Dec 2024 |
| 1048 | Rainbow Oil & Gas LLC | Coolville, OH 45723 | Oil & Gas Operator | Dec 2024 |
| 1049 | Ralph E Shorts Drilling | Polk, OH 44866 | Oil & Gas Operator | Dec 2024 |
| 1050 | Ramah Oil Company LLC | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 2007 |
| 1051 | Randell Oil Co | Wooster, OH 44691 | Oil & Gas Operator | Dec 2024 |
| 1052 | Range Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2000 |
| 1053 | Range Resources Appalachia LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Nov 2025 |
| 1054 | Ray Pander Trucking Inc | Bolivar, OH 44612 | Oil & Gas Operator | Dec 1998 |
| 1055 | Red Bird Producing Co | Wooster, OH 44691 | Oil & Gas Operator | Dec 2024 |
| 1056 | Red Man Oil, Co. | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 1057 | Redco, Inc. | Columbus, OH 43229 | Oil & Gas Operator | Dec 1998 |
| 1058 | Redman E C /Redman Oil Co | Columbus, OH 43229 | Oil & Gas Operator | Dec 2002 |
| 1059 | Rednet Exploration LLC | Nashport, OH 43830 | Oil Operator | Dec 2024 |
| 1060 | Reed Kenneth E | Burbank, OH 44214 | Oil & Gas Operator | Dec 1993 |
| 1061 | Reinke Brad L | Chardon, OH 44024 | Oil & Gas Operator | Dec 2024 |
| 1062 | Reliance Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 1063 | Reliance Oil Corp | Charlottesville, VA 22906 | Oil & Gas Operator | Dec 1988 |
| 1064 | Rennolds Resources LLC | West Farmington, OH 44491 | Oil & Gas Operator | Dec 2024 |
| 1065 | Reno Oil & Gas LLC | Reno, OH 45773 | Oil & Gas Operator | Dec 2024 |
| 1066 | Rent A Home Inc | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2024 |
| 1067 | Reserve Exploration Co. | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2007 |
| 1068 | Resource America Inc | Uniontown, OH 44685 | Oil & Gas Operator | Dec 2011 |
| 1069 | Resource Production Inc | Bridgeport, CT 06604 | Oil & Gas Operator | Dec 1993 |
| 1070 | Reusser Lynn & Herman | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 1991 |
| 1071 | RHDK Oil & Gas LLC/Dba Red Hill | Dover, OH 44622-9801 | Oil & Gas Operator | Dec 2024 |
| 1072 | Rhine Oil Co LLC | Dalton, OH 44618 | Oil & Gas Operator | Dec 1999 |
| 1073 | Rice Drilling D LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Sep 2025 |
| 1074 | Ridge Oil And Gas Inc | Zanesville, OH 43702-2534 | Oil & Gas Operator | Dec 2024 |
| 1075 | Ridgeway Resources | Barberton, OH 44203 | Oil & Gas Operator | Dec 2012 |
| 1076 | Ridgway Realty & Land Inc | University Heights, OH 44118-3818 | Oil & Gas Operator | Dec 2019 |
| 1077 | Rinard Petroleum LLC | Marietta, OH 45750 | Oil & Gas Operator | Dec 2023 |
| 1078 | River Gas Co | Marietta, OH 45750 | Oil & Gas Operator | Dec 1993 |
| 1079 | River Valley Energy Inc | Little Hocking, OH 45742 | Oil & Gas Operator | Dec 2024 |
| 1080 | Riverland Energy LLC | Akron, OH 44313 | Oil & Gas Operator | Dec 2024 |
| 1081 | Riverside Petroleum & Prod. | Oxford, MS 38655 | Oil & Gas Operator | Dec 2023 |
| 1082 | RMB Corporation | Senecaville, OH 43780 | Oil & Gas Operator | Dec 2016 |
| 1083 | Rmi Company | Niles, OH 44446 | Oil & Gas Operator | Dec 1984 |
| 1084 | Robert L Shapley Oil & Gas | New Matamoras, OH 45767 | Oil & Gas Operator | Dec 2024 |
| 1085 | Rocanville Corporation | Dallas, TX 75225 | Oil & Gas Operator | Dec 2016 |
| 1086 | Rockwell Resources Inc | New Matamoras, OH 45767 | Oil & Gas Operator | Dec 2024 |
| 1087 | Rod Johnson Operations | Miramar Beach, FL 32550 | Oil & Gas Operator | Dec 2015 |
| 1088 | Roma Oil & Gas LLC | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 2024 |
| 1089 | Roman Well Services Inc | Lakeville, OH 44638 | Oil & Gas Operator | Dec 2023 |
| 1090 | Ronald A Gibson & Assoc Inc | Avon Lake, OH 44012 | Oil & Gas Operator | Dec 2024 |
| 1091 | Roscoe Gas & Oil Co | Dover, OH 44622 | Oil & Gas Operator | Dec 1991 |
| 1092 | Roulette Energy LLC | Canal Wincheste, OH 43110 | Oil & Gas Operator | Dec 2023 |
| 1093 | Royal Petroleum Prop Inc | Woodville, OH 43469 | Oil & Gas Operator | Dec 1990 |
| 1094 | Royalton Gas & Oil Co | Brunswick, OH 44212 | Oil & Gas Operator | Dec 1990 |
| 1095 | RPJ Fund Management Inc | St. Paul, MN 55101 | Oil & Gas Operator | Dec 1991 |
| 1096 | RRKK LLC | Columbus, OH 43214-3072 | Oil Operator | Dec 2024 |
| 1097 | RSC Energy Corp | Brooklyn HTS, OH 44109 | Oil & Gas Operator | Dec 1984 |
| 1098 | Rubber City Oil & Gas LLC | Louisville, OH 44641 | Oil & Gas Operator | Dec 2024 |
| 1099 | Ruffner Petroleum Corp | Akron, OH 44308 | Oil & Gas Operator | Dec 2000 |
| 1100 | Russell E Snider LLC | Newark, OH 43055 | Oil Operator | Dec 2024 |