| 801 | Nucomer Energy LLC | Erie, PA 16507 | Oil & Gas Operator | Aug 2023 |
| 802 | Nuttco Oil & Gas | Corning, OH 43730 | Oil & Gas Operator | Dec 2010 |
| 803 | Nytis Exploration Company LLC | Lexington, KY 40509 | Oil & Gas Operator | Dec 2021 |
| 804 | Oak Dale Drilling Co | Logan, OH 43138-1851-1851 | Oil & Gas Operator | Dec 2015 |
| 805 | Obermiller Clarence Trust | Creston, OH 44217 | Oil & Gas Operator | Dec 1987 |
| 806 | Obermiller Paul J | Creston, OH 44217 | Oil & Gas Operator | Dec 2014 |
| 807 | Og Co., Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 808 | Ohio Energy Assets, Inc. | Laurelville, OH 43135 | Oil & Gas Operator | Dec 2014 |
| 809 | Ohio Energy Operators LLC | Colorado Spring, CO 80908 | Oil Operator | Dec 2018 |
| 810 | Ohio L & M Company Inc | Marietta, OH 45750 | Oil & Gas Operator | Dec 2008 |
| 811 | Ohio Natural Fuel Co | Canton, OH 44718 | Oil & Gas Operator | Dec 1985 |
| 812 | Ohio Oil & Gas | Fowler, OH 44418 | Oil & Gas Operator | Dec 1988 |
| 813 | Ohio Production Corp | Westerville, OH 43081 | Oil & Gas Operator | Dec 2001 |
| 814 | Ohio Production* | Newark, OH 43055 | Oil & Gas Operator | Dec 1987 |
| 815 | Ohio Valley Energy Systems Corp | Austintown, OH 44515 | Oil & Gas Operator | Dec 2023 |
| 816 | Oil & Gas Solutions LTD | Wooster, OH 44691 | Oil & Gas Operator | Dec 2007 |
| 817 | Oil & Realty Devlop Inc | Columbus, OH 43212 | Oil Operator | Dec 1986 |
| 818 | Oil Enterprises | Logan, OH 43138 | Oil & Gas Operator | Dec 2022 |
| 819 | Oil Search Inc | Brookfield, OH 44403 | Oil & Gas Operator | Dec 2022 |
| 820 | Oiltech Inc | Yuba City, CA 95991 | Oil & Gas Operator | Dec 1984 |
| 821 | Oiltex, Inc. | Baltimore, MD 21221 | Oil & Gas Operator | Dec 2013 |
| 822 | Okmar Oil Company | Marietta, OH 45750 | Oil & Gas Operator | Jun 2005 |
| 823 | Old South Oil LLC | Marietta, OH 45750 | Oil & Gas Operator | Dec 2023 |
| 824 | Ole Miss Oil & Gas Inc | New Bremen, OH 45689 | Oil & Gas Operator | Dec 1985 |
| 825 | Olympic Resources Co | Wooster, OH 44691 | Oil & Gas Operator | Dec 2000 |
| 826 | Omac Oil & Gas Co | Newark, OH 43055 | Oil & Gas Operator | Dec 1990 |
| 827 | Omega Oil Corp | Lafayette, IN 47903 | Oil & Gas Operator | Dec 1987 |
| 828 | Orion Energy Corp | MT Vernon, IL 62864 | Oil & Gas Operator | Dec 1984 |
| 829 | Orion Petro Corp | MT Vernon, IL 62864 | Oil & Gas Operator | Dec 2016 |
| 830 | Orr Robert W Jr | Zanesville, OH 43702-2683-2683 | Oil & Gas Operator | Dec 2022 |
| 831 | Orwig Oil Company Inc | Bradenton, FL 34212 | Oil & Gas Operator | Dec 2022 |
| 832 | Osair Inc | Mentor, OH 44061 | Oil & Gas Operator | Dec 2021 |
| 833 | Otex Inc | N Canton, OH 44720 | Oil & Gas Operator | Dec 1988 |
| 834 | Ows Acquisition Co LLC | Bolivar, OH 44612 | Oil & Gas Operator | Dec 2022 |
| 835 | Oxford Oil | Zanesville, OH 43702-0910-0910 | Oil & Gas Operator | Dec 2012 |
| 836 | P & D Valentine Oil Co | New Matamoras, OH 45767 | Oil & Gas Operator | Dec 2018 |
| 837 | P & S Energy Inc | Mineral Ridge, OH 44440 | Oil & Gas Operator | Dec 2019 |
| 838 | P & S Production LLC | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2013 |
| 839 | P P & G Oil | Pickerington, OH 43147 | Oil & Gas Operator | Dec 2022 |
| 840 | P. D. L. Services, Inc. | Paris, OH 44669 | Oil & Gas Operator | Dec 2020 |
| 841 | Pac Drilling LLC | Bolivar, OH 44612 | Oil & Gas Operator | Dec 2022 |
| 842 | Pace Co/Chas E Hall | Marietta, OH 45750 | Oil & Gas Operator | Dec 1990 |
| 843 | Parker Hannifin Corporation | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2022 |
| 844 | Parkside Pet Of Ohio Inc | Granville, OH 43023 | Oil & Gas Operator | Dec 1987 |
| 845 | Paroco DRLG Funds Inc | Houston, TX 77002 | Oil & Gas Operator | Dec 1993 |
| 846 | Parrot Energy Company | Cortland, OH 44410 | Oil & Gas Operator | Dec 2021 |
| 847 | Partners Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Aug 1995 |
| 848 | Partners Petroleum Inc | Independence, OH 44131 | Oil & Gas Operator | Dec 1988 |
| 849 | Paw Oil And Gas LTD | North Canton, OH 44720 | Oil & Gas Operator | Dec 2022 |
| 850 | PD Valentine Oil & Gas LLC | Newport, OH 45768 | Oil & Gas Operator | Dec 2023 |
| 851 | PDC Energy Inc | Denver, CO 80203 | Oil & Gas Operator | Jan 2024 |
| 852 | PDQ Oil & Gas LLC | The Plains, OH 45780 | Oil & Gas Operator | Dec 2022 |
| 853 | Pedgeco Inc | Cleveland, OH 44115 | Oil & Gas Operator | Dec 1984 |
| 854 | Pelican Producing Inc | Caldwell, OH 43724 | Oil & Gas Operator | Dec 1996 |
| 855 | Pemco Gas Inc | Indian Harbor B, FL 32937 | Oil & Gas Operator | Dec 1997 |
| 856 | Peninsula Group Inc | Peninsula, OH 44264 | Oil & Gas Operator | Dec 1991 |
| 857 | Peninsular Oil & Gas Co | Ada, MI 49301-96-96 | Oil & Gas Operator | Dec 2001 |
| 858 | Penn-Ohio Investment Corp. | New Philadelphi, OH 44663 | Oil & Gas Operator | Dec 2004 |
| 859 | Pennenergy Resources LLC | Pittsburgh, PA 15275-1063-1063 | Oil & Gas Operator | Jan 2024 |
| 860 | Pennzenergy | Houston, TX 77252 | Oil & Gas Operator | Dec 1986 |
| 861 | Pep Drilling LLC | MT Vernon, IL 62864 | Oil & Gas Operator | Dec 2022 |
| 862 | Pepper Oil Co | Newark, OH 43055 | Oil & Gas Operator | Dec 1992 |
| 863 | Peroco Oil & Gas | Killbuck, OH 44637 | Oil & Gas Operator | Dec 1987 |
| 864 | Pet Processors L.L.C | Painesville, OH 44077 | Oil & Gas Operator | Dec 2022 |
| 865 | Petro Drilling Corp | Columbus, OH 43229 | Oil & Gas Operator | Dec 1993 |
| 866 | Petro Evaluation Services Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2022 |
| 867 | Petro Quest Inc | Guysville, OH 45735 | Oil & Gas Operator | Dec 2023 |
| 868 | Petro-Mark, Inc. | St Petersburg, FL 33701 | Oil & Gas Operator | Dec 2021 |
| 869 | Petrocon Inc | Delaware, OH 43015-7147-7147 | Oil & Gas Operator | Dec 2010 |
| 870 | Petroel | Marietta, OH 45750 | Oil & Gas Operator | Dec 2000 |
| 871 | Petroleum Development Cor | Bridgeport, WV 26330 | Oil & Gas Operator | Dec 2004 |
| 872 | Petrox, Inc | Streetsboro, OH 44241 | Oil & Gas Operator | Dec 2023 |
| 873 | Pettigrew Pumping Service Inc | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2023 |
| 874 | Phillips Exploration Inc | Warrendale, PA 15086 | Oil & Gas Operator | Dec 2012 |
| 875 | Phillips Margaret E | Newark, OH 43055 | Oil Operator | Dec 1993 |
| 876 | Piatt Enterprises LLC | Graysville, OH 45734 | Oil & Gas Operator | Dec 2023 |
| 877 | Pillar Energy, LLC | Charleston, WV 25312-5987-5987 | Oil & Gas Operator | Dec 2023 |
| 878 | Pilot Energy LLC | Zanesville, OH 43701 | Oil & Gas Operator | Dec 2013 |
| 879 | Pin Oak Energy Partners LLC | Akron, OH 44311 | Oil & Gas Operator | Jan 2024 |
| 880 | Pin Oak Petroleum Inc | Dallas, TX 75251 | Oil & Gas Operator | Dec 1989 |
| 881 | Pine Top Inc | Akron, OH 44313 | Oil & Gas Operator | Dec 2016 |
| 882 | Pineco | Laurelville, OH 43135 | Oil & Gas Operator | Dec 2023 |
| 883 | Pinevue Farms | Chillicothe, OH 45601 | Oil & Gas Operator | Dec 1993 |
| 884 | Pioneer Drilling Co | Payne, OH 45880 | Oil & Gas Operator | Dec 1993 |
| 885 | Pioneer Resources Inc. | Phillipsburg, KS 67661 | Oil & Gas Operator | Oct 2020 |
| 886 | Pipes Pursie E | MT Vernon, IL 62864 | Oil & Gas Operator | Dec 2014 |
| 887 | Pittencrieff America Inc | Abilene, TX 79608 | Oil & Gas Operator | Feb 2003 |
| 888 | Pleasant Hill Oil Co | Carrollton, OH 44615 | Oil Operator | Dec 2006 |
| 889 | Poling Albert | Logan, OH 43138 | Oil Operator | Dec 2023 |
| 890 | Pominex Inc | Cols, OH 43214 | Oil & Gas Operator | Dec 1988 |
| 891 | Ponderosa Consulting Services Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2019 |
| 892 | Poorboy Exploration LLC | Caldwell, OH 43724-9134-9134 | Oil & Gas Operator | Dec 2022 |
| 893 | Portage Resources Inc | Warren, OH 44484 | Oil & Gas Operator | Dec 2015 |
| 894 | Porter Brothers | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1995 |
| 895 | Porter Petroleum | Hopewell, OH 43746 | Oil & Gas Operator | Dec 2021 |
| 896 | Poston Operating Co Inc | Ashley, OH 43003 | Oil & Gas Operator | Dec 2003 |
| 897 | Pottmeyer David | Fleming, OH 43729 | Oil & Gas Operator | Dec 2023 |
| 898 | Power Gas Marketing & Trans | Akron, OH 44311-1057-1057 | Oil & Gas Operator | Dec 2005 |
| 899 | Power Resour Oper Co Inc | Canton, OH 44718 | Oil & Gas Operator | Dec 2005 |
| 900 | Prime Energy Corp | Charleston, WV 25301-1707-1707 | Oil & Gas Operator | Sep 2015 |