| 20701 | Odom, R. H. | Snyder, TX 79550 | Oil & Gas Operator | Jun 1996 |
| 20702 | Odom, Ralph R. | | Oil & Gas Operator | Aug 1993 |
| 20703 | Odum Oil & Gas Co. | Harper, TX 78631 | Oil & Gas Operator | Nov 2024 |
| 20704 | Odum Ronald L | Garfield, AR 72732 | Oil Operator | Aug 2024 |
| 20705 | Ody Oil Corp. | | Oil & Gas Operator | Oct 1994 |
| 20706 | Odyssey Operating Company | | Oil & Gas Operator | Sep 2020 |
| 20707 | Odyssey Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Apr 1995 |
| 20708 | Odyssey Petroleum Corp. | | Oil & Gas Operator | Jun 2011 |
| 20709 | Oedekoven Amerifields Resources LLC | Sugar Land, TX 77478 | Oil Operator | Aug 2024 |
| 20710 | Oedekoven Water & Hot Oil | Recluse, WY 82725 | Oil & Gas Operator | Oct 2024 |
| 20711 | Oeth DRLG Co | | Oil Operator | Dec 2018 |
| 20712 | Oex-1 LLC | Tulsa, OK 74105-5153 | Oil & Gas Operator | Mar 2024 |
| 20713 | Oexco, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 20714 | Off Broadway Mineral Rights LLC | | Oil & Gas Operator | Aug 2024 |
| 20715 | Offield Lease Operations LLC | Wilson, OK 73463 | Oil & Gas Operator | May 2023 |
| 20716 | Offset Oil & Gas | Big Spring, TX 79720 | Oil & Gas Operator | Aug 2003 |
| 20717 | Offshore Group, Inc. The | Houston, TX 77024 | Oil & Gas Operator | Nov 2024 |
| 20718 | Offshore Oil & Gas Inc | Houston, TX 77063 | Oil & Gas Operator | Sep 1994 |
| 20719 | Offshore Shelf LLC | | Oil & Gas Operator | Dec 2007 |
| 20720 | Ofs-Tulsa Corporation | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 1997 |
| 20721 | Oft Inc. | Houston, TX 77079 | Oil & Gas Operator | Nov 2024 |
| 20722 | Og Co., Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2024 |
| 20723 | Oga Operating L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Jan 2000 |
| 20724 | Ogden Oil Co., Inc. | | Oil Operator | May 1981 |
| 20725 | Ogden Resources Corporation | Bryan, TX 77802 | Oil & Gas Operator | Nov 2024 |
| 20726 | Ogden Resources, LTD. | Bryan, TX 77802 | Oil & Gas Operator | Feb 2009 |
| 20727 | Ogh Oil Company | | Oil Operator | Sep 1995 |
| 20728 | Ogle Petroleum Inc. | | Oil & Gas Operator | Dec 1989 |
| 20729 | Oglesby Oil Company | | Oil & Gas Operator | Nov 2023 |
| 20730 | Oglesby Prod & Expl Co Inc | | Oil & Gas Operator | Nov 1987 |
| 20731 | Oglesby, Marshall | | Oil Operator | May 1990 |
| 20732 | Ogog Operating, LLC | Dallas, TX 75367 | Oil & Gas Operator | Nov 2024 |
| 20733 | Ogris Operating LLC | | Gas Operator | Aug 2024 |
| 20734 | Ogs Operating Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2008 |
| 20735 | Ogx Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Nov 2024 |
| 20736 | Ogx Resources LLC | Midland, TX 79702 | Oil & Gas Operator | Oct 2011 |
| 20737 | Ohio Energy Assets, Inc. | Laurelville, OH 43135 | Oil & Gas Operator | Dec 2014 |
| 20738 | Ohio Energy Group Inc | Uniontown, OH 44685 | Oil & Gas Operator | Dec 1988 |
| 20739 | Ohio Energy Operators LLC | Colorado Spring, CO 80908 | Oil Operator | Dec 2018 |
| 20740 | Ohio Kentucky Oil Corporation | Lexington, KY 40503 | Oil & Gas Operator | Dec 2020 |
| 20741 | Ohio L & M Company Inc | Marietta, OH 45750 | Oil & Gas Operator | Dec 2008 |
| 20742 | Ohio Natural Fuel Co | Canton, OH 44718 | Oil & Gas Operator | Dec 1985 |
| 20743 | Ohio Oil & Gas | Fowler, OH 44418 | Oil & Gas Operator | Dec 1988 |
| 20744 | Ohio Production Corp | Westerville, OH 43081 | Oil & Gas Operator | Dec 2001 |
| 20745 | Ohio Production* | Newark, OH 43055 | Oil & Gas Operator | Dec 1987 |
| 20746 | Ohio Valley Energy Systems Corp | Austintown, OH 44515 | Oil & Gas Operator | Dec 2023 |
| 20747 | Ohio Valley Energy, Inc | Livermore, KY 42352 | Oil Operator | Dec 2022 |
| 20748 | Ohlhausen Oil Company | Abilene, TX 79608 | Oil & Gas Operator | Nov 2024 |
| 20749 | Oi Auburn, Inc. | Tulsa, OK 74135 | Gas Operator | Dec 2023 |
| 20750 | Oil & Gas Acquisition Group, Inc | Austin, TX 78716 | Oil & Gas Operator | May 2003 |
| 20751 | Oil & Gas Development Company | | Oil & Gas Operator | May 1991 |
| 20752 | Oil & Gas Exploration Inc | Cleveland, OK 74020 | Oil & Gas Operator | Aug 2013 |
| 20753 | Oil & Gas MGMT Inc | Mount Pleasant, PA 15666-3304 | Oil & Gas Operator | Dec 2023 |
| 20754 | Oil & Gas Operations | Midland, TX 79706 | Oil & Gas Operator | Nov 2024 |
| 20755 | Oil & Gas Producers, Inc. | Topeka, KS 66604 | Oil Operator | Jun 2004 |
| 20756 | Oil & Gas Properties | Midland, TX 79704 | Oil & Gas Operator | Nov 2024 |
| 20757 | Oil & Gas Property MGMT., Inc. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1996 |
| 20758 | Oil & Gas Servic | | Oil Operator | Jun 1983 |
| 20759 | Oil & Gas Solutions LTD | Wooster, OH 44691 | Oil & Gas Operator | Dec 2007 |
| 20760 | Oil & Gas SVC Inc | Reelsville, IN 46171-9686 | Gas Operator | Dec 1991 |
| 20761 | Oil & Realty Devlop Inc | Columbus, OH 43212 | Oil Operator | Dec 1986 |
| 20762 | Oil And Gas Futures, Inc. | | Oil & Gas Operator | May 1977 |
| 20763 | Oil Capital Corporation | Littleton, CO 80122 | Gas Operator | May 2009 |
| 20764 | Oil Center Operating Inc | Fort Worth, TX 76102-5108 | Oil & Gas Operator | Apr 2014 |
| 20765 | Oil Coast Corp. | S Houston, TX 77587 | Oil & Gas Operator | Nov 2024 |
| 20766 | Oil Company Of America, Inc. | Hays, KS 67601 | Oil Operator | Dec 2009 |
| 20767 | Oil Country Management, Inc. | | Oil & Gas Operator | Jan 2005 |
| 20768 | Oil Creek Production Company | Prague, OK 74864-0667 | Oil & Gas Operator | Jul 2024 |
| 20769 | Oil Development Co | | Oil & Gas Operator | Jan 1979 |
| 20770 | Oil Drillers & D | | Oil & Gas Operator | Feb 1992 |
| 20771 | Oil Enterprises | Logan, OH 43138 | Oil & Gas Operator | Dec 2023 |
| 20772 | Oil Exploration Of America Inc | Sisseton, SD 57262-9503 | Oil & Gas Operator | Jun 2001 |
| 20773 | Oil Field Manage | | Oil Operator | Jun 1991 |
| 20774 | Oil Field Production Inc | Tulsa, OK 74133 | Oil Operator | Aug 2024 |
| 20775 | Oil Gas Management, Inc. | Kansas City, MO 64106 | Oil Operator | Apr 2011 |
| 20776 | Oil Inc | | Oil & Gas Operator | Dec 1971 |
| 20777 | Oil Internationa | | Oil Operator | Jun 1986 |
| 20778 | Oil Investors Inc | Crescent, OK 73028 | Oil & Gas Operator | Sep 2024 |
| 20779 | Oil Lease Operating Co. | Coldspring, TX 77331 | Oil & Gas Operator | Aug 2003 |
| 20780 | Oil Lift, Incorporated | Metairie, LA 70002 | Oil & Gas Operator | Apr 2020 |
| 20781 | Oil Management Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2022 |
| 20782 | Oil Mountain Energy Inc | Casper, WY 82609 | Oil Operator | Sep 2024 |
| 20783 | Oil Operations Inc | | Oil & Gas Operator | Apr 2011 |
| 20784 | Oil Operators Inc. | | Oil & Gas Operator | Aug 2024 |
| 20785 | Oil Palace, Inc. | | Oil Operator | Jun 2016 |
| 20786 | Oil Partners | Salina, KS 67401 | Oil Operator | Jun 2001 |
| 20787 | Oil Partners, LLC | Salina, KS 67401 | Oil Operator | Jul 2024 |
| 20788 | Oil Patch Energy LLC | Tulsa, OK 74017 | Oil & Gas Operator | Sep 2024 |
| 20789 | Oil Patch Operators Co., L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 2024 |
| 20790 | Oil Patch Operators, LLC | | Oil & Gas Operator | Jul 2005 |
| 20791 | Oil Pool Inc | Tulsa, OK 74132-2659 | Oil & Gas Operator | Sep 2024 |
| 20792 | Oil Producers In | | Oil & Gas Operator | Dec 1996 |
| 20793 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | Nov 2024 |
| 20794 | Oil Production Management Inc | Squaw Valley, CA 93675-9725 | Oil & Gas Operator | Dec 2002 |
| 20795 | Oil Production S | | Oil Operator | Sep 1993 |
| 20796 | Oil Production Systems Inc | Cushing, OK 74023 | Oil & Gas Operator | Jan 2013 |
| 20797 | Oil Projects, LLC | Houston, TX 77027 | Oil & Gas Operator | Nov 2024 |
| 20798 | Oil Prop Company | | Oil & Gas Operator | Sep 1995 |
| 20799 | Oil Prop Investm | | Oil Operator | Dec 1995 |
| 20800 | Oil Properties Co., Inc. | Wichita, KS 67208 | Gas Operator | Dec 2009 |