| 21701 | Orloski John C | Bartlesville, OK 74006 | Oil & Gas Operator | Jan 2025 |
| 21702 | Ormand, Don R. | Midland, TX 79705 | Oil & Gas Operator | Jan 2016 |
| 21703 | Oro Negro Inc. | | Oil & Gas Operator | Dec 2004 |
| 21704 | Oro Resources, LLC | Dallas, TX 75219 | Oil & Gas Operator | Apr 2025 |
| 21705 | Orr Energy LLC | | Oil & Gas Operator | Nov 2012 |
| 21706 | Orr Production Company | Austin, TX 78746 | Oil & Gas Operator | Dec 2000 |
| 21707 | Orr Robert W Jr | Zanesville, OH 43702-2683-2683 | Oil & Gas Operator | Dec 2023 |
| 21708 | Orr, Jr., Donald R. | Batavia, NY 14020 | Gas Operator | Dec 2023 |
| 21709 | Orr, Robert M. | Monahans, TX 79756 | Oil & Gas Operator | Oct 1998 |
| 21710 | Orsburn, Wade Inc. | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2002 |
| 21711 | Orson Leasing & Supply | Rockdale, TX 76567 | Oil & Gas Operator | Dec 2006 |
| 21712 | Orth Oil Company, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Apr 2025 |
| 21713 | Orville S Slaughter Jr | Denver, CO 80205 | Oil & Gas Operator | Aug 2000 |
| 21714 | Orwig Oil Company Inc | Bradenton, FL 34212 | Oil & Gas Operator | Dec 2022 |
| 21715 | Orx Resources, Inc. | | Oil & Gas Operator | Dec 2009 |
| 21716 | Orx Resources, L.L.C. | Houston, TX 77067 | Oil & Gas Operator | Apr 2025 |
| 21717 | Oryx Crude Trading & Transporation LP | Dallas, TX 75221 | Oil & Gas Operator | Jun 1999 |
| 21718 | Oryx Energy Comp | | Oil & Gas Operator | Apr 1991 |
| 21719 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 21720 | Os&S Operating Inc. | Electra, TX 76360 | Oil & Gas Operator | Apr 2025 |
| 21721 | Osa Oil & Gas LLC | Tulsa, OK 74131 | Oil & Gas Operator | Aug 2023 |
| 21722 | Osage Energy LLC | Colony, KS 66015 | Oil Operator | Nov 2023 |
| 21723 | Osage Energy Resources LLC | Bartlesville, OK 74005-2527 | Oil & Gas Operator | Jan 2025 |
| 21724 | Osage Exploration & Development Inc | San Diego, CA 92131-3807 | Oil & Gas Operator | Oct 2016 |
| 21725 | Osage Hot Oil Service | Newcastle, WY 82701 | Oil & Gas Operator | Jul 1997 |
| 21726 | Osage Oil & Transportation Inc | Cleveland, OK 74020 | Oil & Gas Operator | Nov 2000 |
| 21727 | Osage Operating | Virginia Beach, VA 23452 | Oil & Gas Operator | Oct 2003 |
| 21728 | Osage Operating Company LLC | Seattle, WA 98133 | Oil Operator | May 2006 |
| 21729 | Osage Partners LLC | | Oil & Gas Operator | Mar 2025 |
| 21730 | Osage Petroleum Corporation | Saint Louis, MO 63131-4691 | Oil & Gas Operator | Mar 2009 |
| 21731 | Osage Resources, LLC | Wichita, KS 67202 | Oil & Gas Operator | Aug 2024 |
| 21732 | Osair Inc | Mentor, OH 44061 | Oil & Gas Operator | Dec 2021 |
| 21733 | Osborn Energy, L.L.C. | Bucyrus, KS 66013 | Oil & Gas Operator | Jul 2017 |
| 21734 | Osborn Heirs Co | San Antonio, TX 78217 | Oil & Gas Operator | Feb 2025 |
| 21735 | Osborn Heirs Com | | Oil & Gas Operator | May 1995 |
| 21736 | Osborn Heirs Company LTD | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2024 |
| 21737 | Osborn Oil & Gas | | Oil & Gas Operator | Jun 1991 |
| 21738 | Osborn,W.B. Oil & Gas Operations | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2025 |
| 21739 | Osborne Oil Co. | Dallas, TX 75244 | Oil & Gas Operator | Aug 2003 |
| 21740 | Osburn Gerald Dba Ozzy & Son Oil & Gas | Drumright, OK 74030-5467 | Oil Operator | Oct 2020 |
| 21741 | Oscar Oil Company | Iowa Park, TX 76367 | Oil & Gas Operator | Sep 2004 |
| 21742 | Oscar'S Well Service Inc | Okemah, OK 74859 | Oil & Gas Operator | Apr 1998 |
| 21743 | Osceola Oil & Gas Corporation | Somerset, TX 78069 | Oil & Gas Operator | Aug 1994 |
| 21744 | Osci Oil And Gas, Inc. | Parker, KS 66072 | Oil Operator | Jun 1998 |
| 21745 | Oshtah Oil Company LLC | Stratford, OK 74872 | Oil & Gas Operator | Sep 2018 |
| 21746 | Osman Global Services LLC | | Oil & Gas Operator | Jan 2025 |
| 21747 | Oso Exploration & Production, LLC | Houston, TX 77269 | Oil Operator | Apr 2025 |
| 21748 | Oso Exploration Co. | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2011 |
| 21749 | Oso Oil & Gas Properties LLC | Price, UT 84501 | Gas Operator | Jun 2016 |
| 21750 | Oso Perdido Services LLC | Flatonia, TX 78941 | Oil Operator | Feb 2025 |
| 21751 | Oso Resources LLC | Oklahoma City, OK 73118-5022 | Oil & Gas Operator | Jan 2025 |
| 21752 | Ososki Edward D Dba Federal Oil Company | | Oil & Gas Operator | Jun 2022 |
| 21753 | Osprey Petroleum Company, Inc. | Manvel, TX 77578 | Oil & Gas Operator | May 2020 |
| 21754 | Osr Oil & Gas Company | Victoria, TX 77902 | Oil & Gas Operator | Jul 2000 |
| 21755 | Osr Oil & Gas Corp | Midland, TX 79710 | Oil & Gas Operator | Dec 2024 |
| 21756 | Osterhout Phillip L | Drumright, OK 74030-0693 | Oil & Gas Operator | Jan 2014 |
| 21757 | Ostrich Oil & Gas, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 21758 | Oswego Arbuckle Enterprise Inc | S Coffeyville, OK 74072-9702 | Oil & Gas Operator | Mar 2015 |
| 21759 | Oswego Oil & Gas | | Oil & Gas Operator | Jun 1984 |
| 21760 | Oswego, Inc. | Amarillo, TX 79109 | Oil & Gas Operator | Jun 2004 |
| 21761 | Osyka Oil & Gas, Inc. | Metairie, LA 70004 | Oil & Gas Operator | Apr 2025 |
| 21762 | Osyka Permian, LLC | Houston, TX 77079 | Oil & Gas Operator | Apr 2025 |
| 21763 | Osyka Producing Company, Inc. | Houston, TX 77242 | Oil & Gas Operator | Apr 2025 |
| 21764 | Otb Operating, LLC | Stanton, TX 79782 | Oil & Gas Operator | Apr 2025 |
| 21765 | Otc Investors Inc | Locust Grove, OK 74352 | Oil Operator | Jan 2025 |
| 21766 | Otc Petroleum Corporation | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2015 |
| 21767 | Otc/Occ Not Assigned | | Oil & Gas Operator | Dec 2024 |
| 21768 | Otex Inc | N Canton, OH 44720 | Oil & Gas Operator | Dec 1988 |
| 21769 | Otex LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Apr 2025 |
| 21770 | Otex Resources LLC | Baytown, TX 77520 | Oil & Gas Operator | Apr 2025 |
| 21771 | Otis C. Coles, Jr. | | Oil & Gas Operator | Jan 1998 |
| 21772 | Oto, Co. | Woodward, OK 73802 | Oil & Gas Operator | Jun 1998 |
| 21773 | Ott Inc | Casper, WY 82602 | Oil Operator | Dec 2024 |
| 21774 | Otter Exploration Inc | Warren, PA 16365-9689 | Oil & Gas Operator | Dec 2021 |
| 21775 | Ouachita Development Corp. | | Gas Operator | Mar 2014 |
| 21776 | Ouachita Exploration Inc | Chickasha, OK 73018 | Oil & Gas Operator | Jan 2025 |
| 21777 | Ouida Oil | Rowlett, TX 75030 | Oil & Gas Operator | Mar 2008 |
| 21778 | Ouida Oil Co. | | Oil & Gas Operator | Apr 1999 |
| 21779 | Outback Oil, Inc. | Pratt, KS 67124 | Gas Operator | Sep 2019 |
| 21780 | Outback Petroleum Inc | Moore, OK 73160-9998 | Oil & Gas Operator | Mar 2015 |
| 21781 | Outlaw Oil And Gas LLC | Kaw City, OK 74641 | Oil & Gas Operator | Jan 2025 |
| 21782 | Outlaw Oil LLC | Caldwell, TX 77836 | Oil & Gas Operator | Apr 2025 |
| 21783 | Outlaw Well Service LLC | Hays, KS 67601 | Oil Operator | Oct 2024 |
| 21784 | Outline Oil Company LLC | Beeville, TX 78104 | Oil Operator | Apr 2025 |
| 21785 | Outline Oil Corp. | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2025 |
| 21786 | Outlook Petroleum Corp. | Midland, TX 79702 | Oil & Gas Operator | Jan 2001 |
| 21787 | Outman, Joshua J. | Andover, NY 14806 | Oil & Gas Operator | Dec 2023 |
| 21788 | Output Acquisition Corp. | | Oil & Gas Operator | Jul 2010 |
| 21789 | Output Exploration LLC | | Oil & Gas Operator | Dec 2006 |
| 21790 | Ouut Investing LLC | Mineral Wells, TX 76068 | Oil Operator | Mar 2020 |
| 21791 | Ovaco Energy Inc. | | Oil & Gas Operator | Nov 2009 |
| 21792 | Ovation Energy II, LP | Houston, TX 77279 | Oil & Gas Operator | Jun 2011 |
| 21793 | Ovation Energy, LP | N Richlnd HLS, TX 76180 | Oil & Gas Operator | Sep 2004 |
| 21794 | Overfield, Lee R | Waverly, KY 42462 | Oil Operator | Dec 2016 |
| 21795 | Overflow Energy Stack LLC | Booker, TX 79005 | Oil Operator | Sep 2022 |
| 21796 | Overflow Energy, LLC | Booker, TX 79005 | Oil & Gas Operator | Apr 2025 |
| 21797 | Overland Exploration Company | | Oil Operator | Sep 2024 |
| 21798 | Overland Investments Inc | Coweta, OK 74429 | Oil & Gas Operator | Jan 2025 |
| 21799 | Overland Operating Company, LLC | Abilene, TX 79601 | Oil Operator | Apr 2025 |
| 21800 | Overland Resources LLC | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Jul 2019 |