| 20701 | Oildigger Resources Fund L LLLP | Billings, MT 59101 | Oil & Gas Operator | Jul 2024 |
| 20702 | Oilex Int'L Investments, Inc. | Luling, TX 78648 | Oil & Gas Operator | Sep 2024 |
| 20703 | Oilfield Consultants | | Oil & Gas Operator | Dec 1987 |
| 20704 | Oilfield Management, Inc. (A) | Midland, TX 79702 | Oil & Gas Operator | Sep 2024 |
| 20705 | Oilfield Operating Company | Cushing, OK 74023-1347 | Oil & Gas Operator | Jan 2018 |
| 20706 | Oilfield Research, Inc | | Oil Operator | Dec 2021 |
| 20707 | Oilfield Salvage & Service Company | Littleton, CO 80120 | Oil & Gas Operator | Jul 2024 |
| 20708 | Oilfield Search | | Oil Operator | Mar 1990 |
| 20709 | Oilfield Services And Supply Co. Inc. | | Oil Operator | Sep 1989 |
| 20710 | Oilfield Services, LLC | Winfield, KS 67156 | Oil Operator | Nov 2017 |
| 20711 | Oilfield Truck Service | | Oil Operator | Jun 2014 |
| 20712 | Oilrox Resources LLC | San Antonio, TX 78258 | Oil & Gas Operator | Aug 2023 |
| 20713 | Oilsearch Corporation | Albuquerque, NM 87109 | Oil & Gas Operator | Feb 1994 |
| 20714 | Oiltech Inc | Yuba City, CA 95991 | Oil & Gas Operator | Dec 1984 |
| 20715 | Oiltex, Inc. | Baltimore, MD 21221 | Oil & Gas Operator | Dec 2013 |
| 20716 | Oilton Petroleum Inc | Oilton, OK 74052-0459 | Oil & Gas Operator | Oct 2001 |
| 20717 | Oilton Resources, Inc. | Laredo, TX 78041 | Oil & Gas Operator | Sep 2024 |
| 20718 | Oilwell Acquisition Co. | | Oil & Gas Operator | Jun 1999 |
| 20719 | Oilwell Operators, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Sep 2024 |
| 20720 | Oily Dog Operators Texas, LLC | Austin, TX 78746 | Oil Operator | Sep 2024 |
| 20721 | Ojai Oil Company | Camarillo, CA 93012 | Oil & Gas Operator | Jul 2024 |
| 20722 | Ojb, Inc. | Buda, TX 78610 | Oil & Gas Operator | Mar 2013 |
| 20723 | Ojt, LLC | Richmond, TX 77469 | Oil Operator | Sep 2024 |
| 20724 | Ok Arena Operating Company | Oklahoma City, OK 73101 | Oil & Gas Operator | Sep 2024 |
| 20725 | Ok Oil Company, Inc. | Bivins, TX 75555 | Oil & Gas Operator | Feb 2013 |
| 20726 | Ok Operating Co | Midland, TX 79702 | Oil & Gas Operator | Aug 1999 |
| 20727 | Ok-La-Tex Production, Inc. | | Oil & Gas Operator | Jan 1982 |
| 20728 | Okc Energy Corporation | Oklahoma City, OK 73120-3119 | Oil & Gas Operator | Nov 2014 |
| 20729 | Okemah Production Inc | | Oil Operator | Dec 2005 |
| 20730 | Okie Crude Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2024 |
| 20731 | Okie Operating Company, LTD. | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2024 |
| 20732 | Okkatahula, Inc. | | Oil Operator | Nov 1978 |
| 20733 | Okla Petroleum Energies Corp | | Oil Operator | Jan 2013 |
| 20734 | Okla Petroleum Reclaimers Inc | Kellyville, OK 74039 | Oil Operator | Jul 2020 |
| 20735 | Okla Sub-Surface Pump & Supply Co | Seminole, OK 74804 | Oil & Gas Operator | Jun 2024 |
| 20736 | Okla. Magic Circle Energy Corp. | Shawnee, OK 74801 | Oil & Gas Operator | Jul 2004 |
| 20737 | Oklahoma & Northwestern Co. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 1997 |
| 20738 | Oklahoma Arrowhead Energy, Inc. | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 1996 |
| 20739 | Oklahoma Basic Economy Corp | Houston, TX 77002-6003 | Oil & Gas Operator | Apr 2020 |
| 20740 | Oklahoma Cellulose Inc | Cleveland, OK 74020 | Oil Operator | Jun 2024 |
| 20741 | Oklahoma Crude Inc | Broken Arrow, OK 74012 | Oil & Gas Operator | Apr 2024 |
| 20742 | Oklahoma Crude Reclaimers, LLC | | Oil Operator | Jul 2024 |
| 20743 | Oklahoma Ea II, L.L.C. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2004 |
| 20744 | Oklahoma Energy & Exploration, Inc. | Tulsa, OK 74114 | Oil Operator | Jan 1996 |
| 20745 | Oklahoma Energy Acquisitions LP | Houston, TX 77094-1900 | Oil & Gas Operator | Jun 2024 |
| 20746 | Oklahoma Energy Development Co | | Oil & Gas Operator | Sep 2008 |
| 20747 | Oklahoma Energy Exchange LLC | Duncan, OK 73534-1105 | Oil & Gas Operator | Sep 2012 |
| 20748 | Oklahoma Energy LLC | Skiatook, OK 74070-3998 | Oil Operator | Aug 2023 |
| 20749 | Oklahoma Equipment & Salvage | Oklahoma City, OK 73120-5903 | Oil & Gas Operator | Mar 2015 |
| 20750 | Oklahoma Gas & Oil Corporation | Okemah, OK 74859 | Oil Operator | Oct 2018 |
| 20751 | Oklahoma Liquid Resources Inc | Collinsville, OK 74021 | Oil & Gas Operator | May 2024 |
| 20752 | Oklahoma Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Feb 2020 |
| 20753 | Oklahoma Natural Resources Inc | Woodward, OK 73801 | Oil & Gas Operator | Sep 1996 |
| 20754 | Oklahoma O & G Royalties Inc | Duncan, OK 73533 | Oil & Gas Operator | Nov 2000 |
| 20755 | Oklahoma Oil & Gas MGMT Inc | Edmond, OK 73083-6786 | Oil & Gas Operator | Jun 2024 |
| 20756 | Oklahoma Oil And Gas Resources LLC | Guthrie, OK 73044-8095 | Oil & Gas Operator | Jun 2024 |
| 20757 | Oklahoma Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2013 |
| 20758 | Oklahoma Oil Tactics Inc | Edmond, OK 73003-1351 | Oil & Gas Operator | Mar 2015 |
| 20759 | Oklahoma Operating Company | Midland, TX 79708 | Oil & Gas Operator | Sep 2024 |
| 20760 | Oklahoma Operating, LLC | Holliday, TX 76366 | Oil Operator | Nov 2003 |
| 20761 | Oklahoma Petroleum Allies LLC | Ardmore, OK 73401 | Oil Operator | Oct 2023 |
| 20762 | Oklahoma Petroleum MGMT Corp | Tulsa, OK 74119 | Oil & Gas Operator | Jun 1993 |
| 20763 | Oklahoma Prime Energy LLC | Ardmore, OK 73401 | Oil Operator | May 2020 |
| 20764 | Oklahoma RB Operating Company | Midland, TX 79701 | Oil & Gas Operator | Jan 1998 |
| 20765 | Oklahoma Rig & Salvage, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 20766 | Oklahoma SWD Systems Inc | Odessa, TX 79762-8132 | Oil & Gas Operator | Jun 2024 |
| 20767 | Oklahoma Tank Service Inc | Oklahoma City, OK 73143 | Oil Operator | Aug 1997 |
| 20768 | Okland Oil Company | Oklahoma City, OK 73102-9022 | Oil & Gas Operator | Jul 2024 |
| 20769 | Oklaoleum Oil And Gas Inc | Bristow, OK 74010-0057 | Oil Operator | Jan 2016 |
| 20770 | Oklatex Energy, Inc. | Beaumont, TX 77702 | Oil Operator | Sep 2024 |
| 20771 | Okmar Oil Compan | | Oil & Gas Operator | Feb 1995 |
| 20772 | Okmar Oil Company | Marietta, OH 45750 | Oil & Gas Operator | Jun 2005 |
| 20773 | Okreek Oil Company | Weatherford, TX 76086 | Oil & Gas Operator | Sep 2024 |
| 20774 | Okt Petroleum Company Inc | Oklahoma City, OK 73118-7425 | Oil & Gas Operator | Oct 2013 |
| 20775 | Okt Resources, LLC | Edmond, OK 73013 | Oil & Gas Operator | Sep 2024 |
| 20776 | Oktex Operating LLC | Edmond, OK 73013-1961 | Oil & Gas Operator | May 2020 |
| 20777 | Oky Investments, Inc. | Edmond, OK 73013 | Oil & Gas Operator | Sep 2021 |
| 20778 | Ol' Boys Operations LLC | Pampa, TX 79065 | Oil & Gas Operator | Sep 2024 |
| 20779 | Ol' Oily LLC | | Oil Operator | May 2024 |
| 20780 | Olak Energy Production, LLC | Fort Gibson, OK 74434 | Oil Operator | Apr 2024 |
| 20781 | Old Acres Farm, Inc. | Perry, NY 14530 | Gas Operator | Dec 2023 |
| 20782 | Old Cedron, L.L.C. | Lubbock, TX 79410 | Oil & Gas Operator | May 2004 |
| 20783 | Old Dominion Oil Corporation | Oklahoma City, OK 73107 | Oil & Gas Operator | Apr 2009 |
| 20784 | Old Field Associates | | Oil & Gas Operator | Jul 2024 |
| 20785 | Old MTN Gas Co Inc | Pleasantville, PA 16341-0329 | Oil & Gas Operator | Dec 2020 |
| 20786 | Old Pine Energy Corporation | Austin, TX 78755 | Oil Operator | Sep 2024 |
| 20787 | Old South Oil LLC | Marietta, OH 45750 | Oil & Gas Operator | Dec 2023 |
| 20788 | Old Timers Oil | Saratoga, TX 77585 | Oil & Gas Operator | Nov 2014 |
| 20789 | Old Timers Oil Company, LLC | Saratoga, TX 77585 | Oil Operator | Aug 2022 |
| 20790 | Old Timers Oil No. 2 Incorporated | Saratoga, TX 77585 | Oil Operator | Sep 2024 |
| 20791 | Old Union Operating Company | Austin, TX 78716 | Oil & Gas Operator | Sep 2024 |
| 20792 | Olde Chautauqua Farms | Portland, NY 14769 | Gas Operator | Dec 2023 |
| 20793 | Older Than Dirt LLC | Palo Pinto, TX 76484 | Oil & Gas Operator | Sep 2024 |
| 20794 | Oldfield Acquisition LP | Austin, TX 78733 | Oil & Gas Operator | Sep 1996 |
| 20795 | Oldfield Operating Corporation | | Oil Operator | Dec 2013 |
| 20796 | Olds Oil Company | Casper, WY 82604 | Oil Operator | Jun 1988 |
| 20797 | Ole Chaparral On Possum Kingdom | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 1997 |
| 20798 | Ole Crow Operating | Wichita Falls, TX 76308 | Oil Operator | Jun 2024 |
| 20799 | Ole Miss Oil & Gas Inc | New Bremen, OH 45689 | Oil & Gas Operator | Dec 1985 |
| 20800 | Ole, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |