| 901 | Omac Oil & Gas Co | Newark, OH 43055 | Oil & Gas Operator | Dec 1990 |
| 902 | Omega Oil Corp | Lafayette, IN 47903 | Oil & Gas Operator | Dec 1987 |
| 903 | Orion Energy Corp | MT Vernon, IL 62864 | Oil & Gas Operator | Dec 1984 |
| 904 | Orion Petro Corp | MT Vernon, IL 62864 | Oil & Gas Operator | Dec 2016 |
| 905 | Orr Robert W Jr | Zanesville, OH 43702-2683 | Oil & Gas Operator | Dec 2023 |
| 906 | Orwig Oil Company Inc | Bradenton, FL 34212 | Oil & Gas Operator | Dec 2022 |
| 907 | Osair Inc | Mentor, OH 44061 | Oil & Gas Operator | Dec 2021 |
| 908 | Otex Inc | N Canton, OH 44720 | Oil & Gas Operator | Dec 1988 |
| 909 | Ows Acquisition Co LLC | Louisville, OH 44641 | Oil & Gas Operator | Dec 2024 |
| 910 | Oxford Oil | Zanesville, OH 43702 | Oil & Gas Operator | Dec 2012 |
| 911 | Ozark Oil LLC | Beallsville, OH 43716 | Oil & Gas Operator | Dec 2024 |
| 912 | P & D Valentine Oil Co | New Matamoras, OH 45767 | Oil & Gas Operator | Dec 2018 |
| 913 | P & S Energy Inc | Mineral Ridge, OH 44440 | Oil & Gas Operator | Dec 2019 |
| 914 | P & S Production LLC | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2013 |
| 915 | P P & G Oil | Pickerington, OH 43147 | Oil & Gas Operator | Dec 2024 |
| 916 | P. D. L. Services, Inc. | Minerva, OH 44657 | Oil & Gas Operator | Dec 2024 |
| 917 | Pac Drilling LLC | Bolivar, OH 44612 | Oil & Gas Operator | Dec 2024 |
| 918 | Pace Co/Chas E Hall | Marietta, OH 45750 | Oil & Gas Operator | Dec 1990 |
| 919 | Paragon Energy Co | Columbus, OH 43214 | Oil & Gas Operator | Dec 1989 |
| 920 | Parker Hannifin Corporation | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2024 |
| 921 | Parkside Pet Of Ohio Inc | Granville, OH 43023 | Oil & Gas Operator | Dec 1987 |
| 922 | Paroco DRLG Funds Inc | Houston, TX 77002 | Oil & Gas Operator | Dec 1993 |
| 923 | Parrot Energy Company | Cortland, OH 44410 | Oil & Gas Operator | Dec 2024 |
| 924 | Partners Petroleum Inc | Independence, OH 44131 | Oil & Gas Operator | Dec 1988 |
| 925 | Paw Oil And Gas LTD | North Canton, OH 44720 | Oil & Gas Operator | Dec 2024 |
| 926 | PD Valentine Oil & Gas LLC | Newport, OH 45768 | Oil & Gas Operator | Dec 2024 |
| 927 | PDC Energy Inc | Denver, CO 80203 | Oil & Gas Operator | Nov 2025 |
| 928 | PDQ Oil & Gas LLC | The Plains, OH 45780 | Oil & Gas Operator | Dec 2024 |
| 929 | Pedgeco Inc | Cleveland, OH 44115 | Oil & Gas Operator | Dec 1984 |
| 930 | Pelican Producing Inc | Caldwell, OH 43724 | Oil & Gas Operator | Dec 1996 |
| 931 | Pemco Gas Inc | Indian Harbor B, FL 32937 | Oil & Gas Operator | Dec 1997 |
| 932 | Peninsula Group Inc | Peninsula, OH 44264 | Oil & Gas Operator | Dec 1991 |
| 933 | Peninsular Oil & Gas Co | Ada, MI 49301 | Oil & Gas Operator | Dec 2001 |
| 934 | Penn-Ohio Investment Corp. | New Philadelphi, OH 44663 | Oil & Gas Operator | Dec 2004 |
| 935 | Pennenergy Resources LLC | Pittsburgh, PA 15275-1063 | Oil & Gas Operator | Oct 2025 |
| 936 | Pennzenergy | Houston, TX 77252 | Oil & Gas Operator | Dec 1986 |
| 937 | Pep Drilling LLC | MT Vernon, IL 62864 | Oil & Gas Operator | Dec 2024 |
| 938 | Pepper Oil Co | Newark, OH 43055 | Oil & Gas Operator | Dec 1992 |
| 939 | Peroco Oil & Gas | Killbuck, OH 44637 | Oil & Gas Operator | Dec 1987 |
| 940 | Pet Processors L.L.C | Painesville, OH 44077 | Oil & Gas Operator | Dec 2024 |
| 941 | Petro Drilling Corp | Columbus, OH 43229 | Oil & Gas Operator | Dec 1993 |
| 942 | Petro Evaluation Services Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2023 |
| 943 | Petro Quest Inc | Guysville, OH 45735 | Oil & Gas Operator | Dec 2024 |
| 944 | Petro-Mark, Inc. | St Petersburg, FL 33701 | Oil & Gas Operator | Dec 2021 |
| 945 | Petroc Company | Rocky River, OH 44116 | Oil Operator | Dec 2008 |
| 946 | Petrocon Inc | Delaware, OH 43015-7147 | Oil & Gas Operator | Dec 2010 |
| 947 | Petroel | Marietta, OH 45750 | Oil & Gas Operator | Dec 2000 |
| 948 | Petroleum Development Cor | Bridgeport, WV 26330 | Oil & Gas Operator | Dec 2004 |
| 949 | Petrox, Inc | Streetsboro, OH 44241 | Oil & Gas Operator | Dec 2024 |
| 950 | Pettigrew Pumping Service Inc | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2024 |
| 951 | Phillips Exploration Inc | Warrendale, PA 15086 | Oil & Gas Operator | Dec 2012 |
| 952 | Phillips Margaret E | Newark, OH 43055 | Oil Operator | Dec 1993 |
| 953 | Phoenix NTL Petroleum Co | Englewood, NJ 07631 | Oil & Gas Operator | Dec 1990 |
| 954 | Piatt Enterprises LLC | Graysville, OH 45734 | Oil & Gas Operator | Dec 2024 |
| 955 | Pillar Energy, LLC | Charleston, WV 25312-5987 | Oil & Gas Operator | Dec 2024 |
| 956 | Pilot Energy LLC | Zanesville, OH 43701 | Oil & Gas Operator | Dec 2013 |
| 957 | Pin Oak Energy Partners LLC | Akron, OH 44311 | Oil & Gas Operator | Oct 2025 |
| 958 | Pin Oak Petroleum Inc | Dallas, TX 75251 | Oil & Gas Operator | Dec 1989 |
| 959 | Pine Top Inc | Akron, OH 44313 | Oil & Gas Operator | Dec 2016 |
| 960 | Pineco | Laurelville, OH 43135 | Oil & Gas Operator | Dec 2023 |
| 961 | Pinevue Farms | Chillicothe, OH 45601 | Oil & Gas Operator | Dec 1993 |
| 962 | Pioneer Drilling Co | Payne, OH 45880 | Oil & Gas Operator | Dec 1993 |
| 963 | Pioneer Resources Inc | Phillipsburg, KS 67661 | Oil & Gas Operator | Oct 2020 |
| 964 | Pipes Pursie E | MT Vernon, IL 62864 | Oil & Gas Operator | Dec 2014 |
| 965 | Pittencrieff America Inc | Abilene, TX 79608 | Oil & Gas Operator | Feb 2003 |
| 966 | Pleasant Hill Oil Co | Carrollton, OH 44615 | Oil Operator | Dec 2006 |
| 967 | Poling Albert | Logan, OH 43138 | Oil Operator | Dec 2024 |
| 968 | Pominex Inc | Cols, OH 43214 | Oil & Gas Operator | Dec 1988 |
| 969 | Ponderosa Consulting Services Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2024 |
| 970 | Poorboy Exploration LLC | Caldwell, OH 43724-9134 | Oil & Gas Operator | Dec 2024 |
| 971 | Portage Exploration Co In | Salem, IL 62881 | Oil & Gas Operator | Dec 2004 |
| 972 | Portage Resources Inc | Warren, OH 44484 | Oil & Gas Operator | Dec 2015 |
| 973 | Porter Brothers | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1995 |
| 974 | Porter Petroleum | Hopewell, OH 43746 | Oil & Gas Operator | Dec 2021 |
| 975 | Porter Petroleum Of Seo LLC | Hopewell, OH 43746 | Oil Operator | Dec 2024 |
| 976 | Poston Operating Co Inc | Ashley, OH 43003 | Oil & Gas Operator | Dec 2003 |
| 977 | Pottmeyer David | Fleming, OH 43729 | Oil & Gas Operator | Dec 2024 |
| 978 | Power Gas Marketing & Trans | Akron, OH 44311-1057 | Oil & Gas Operator | Dec 2005 |
| 979 | Power Resour Oper Co Inc | Canton, OH 44718 | Oil & Gas Operator | Dec 2005 |
| 980 | Prime Energy Corp | Charleston, WV 25301-1707 | Oil & Gas Operator | Sep 2015 |
| 981 | Prime Time Energy Investment Inc | MT Vernon, OH 43050 | Oil & Gas Operator | Dec 2024 |
| 982 | Proco | Wooster, OH 44691 | Oil Operator | Dec 1988 |
| 983 | Profit Energy Company | Jerusalem, OH 43747 | Oil & Gas Operator | Dec 2024 |
| 984 | Progressive Oil & Gas | Moxahala, OH 43761 | Oil & Gas Operator | Dec 2024 |
| 985 | Protege Energy II LLC | Tulsa, OK 74135-3252 | Oil & Gas Operator | Dec 2013 |
| 986 | Protege Energy III LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2024 |
| 987 | Provident Oil & Gas Co | Akron, OH 44313 | Oil & Gas Operator | Dec 1989 |
| 988 | Provident Oil & Gas Corp | Akron, OH 44333 | Oil & Gas Operator | Dec 1991 |
| 989 | Putnam, William H | Marietta, OH 45750 | Oil & Gas Operator | Dec 2022 |
| 990 | Pyramid Oil & Gas Co | Lake Geneva, WI 53147 | Oil & Gas Operator | Dec 2005 |
| 991 | Quadrant Exploration Inc | Marietta, OH 45750 | Oil & Gas Operator | Dec 2000 |
| 992 | Quail Energy Corp | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 2010 |
| 993 | Quaker State Oil Ref Corp | North Canton, OH 44720-1541 | Oil & Gas Operator | Dec 1994 |
| 994 | Quality Oil & Gas Corp | Alliance, OH 44601 | Oil & Gas Operator | Dec 2024 |
| 995 | Questa Petroleum Co | Greensburg, PA 15601 | Oil & Gas Operator | Dec 2006 |
| 996 | R & B Enterprises USA Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 2024 |
| 997 | R & E Enterprises | Paris, OH 44669 | Oil & Gas Operator | Dec 1995 |
| 998 | R & J Well Service LLC | Utica, OH 43080 | Oil & Gas Operator | Dec 2024 |
| 999 | R & R Oil & Gas LLC | Big Spring, TX 79720 | Oil & Gas Operator | Dec 2024 |
| 1000 | R C Poling Co Inc | Junction City, OH 43748 | Oil & Gas Operator | Dec 2024 |