| 7801 | Oklahoma Arrowhead Energy, Inc. | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 1996 |
| 7802 | Oklahoma Ea II, L.L.C. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2004 |
| 7803 | Oklahoma Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Feb 2020 |
| 7804 | Oklahoma Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2013 |
| 7805 | Oklahoma Operating Company | Midland, TX 79708 | Oil & Gas Operator | Jun 2026 |
| 7806 | Oklahoma Operating, LLC | Holliday, TX 76366 | Oil Operator | Nov 2003 |
| 7807 | Oklahoma RB Operating Company | Midland, TX 79701 | Oil & Gas Operator | Jan 1998 |
| 7808 | Oklatex Energy, Inc. | Beaumont, TX 77702 | Oil Operator | Jun 2026 |
| 7809 | Okmar Oil Company | Marietta, OH 45750 | Oil & Gas Operator | Jun 2005 |
| 7810 | Okreek Oil Company | Weatherford, TX 76086 | Oil & Gas Operator | Jun 2026 |
| 7811 | Okt Resources, LLC | Edmond, OK 73013 | Oil & Gas Operator | Jun 2026 |
| 7812 | Oky Investments, Inc. | Edmond, OK 73013 | Oil & Gas Operator | Sep 2021 |
| 7813 | Ol' Boys Operations LLC | Pampa, TX 79065 | Oil & Gas Operator | Jun 2026 |
| 7814 | Old Cedron, L.L.C. | Lubbock, TX 79410 | Oil & Gas Operator | May 2004 |
| 7815 | Old Chief Oil, LLC | San Antonio, TX 78205 | Oil Operator | Jun 2026 |
| 7816 | Old Pine Energy Corporation | Austin, TX 78755 | Oil Operator | Jun 2026 |
| 7817 | Old Timers Oil | Saratoga, TX 77585 | Oil & Gas Operator | Nov 2014 |
| 7818 | Old Timers Oil Company, LLC | Saratoga, TX 77585 | Oil Operator | Aug 2022 |
| 7819 | Old Timers Oil No. 2 Incorporated | Saratoga, TX 77585 | Oil Operator | Jun 2026 |
| 7820 | Old Union Operating Company | Austin, TX 78716 | Oil & Gas Operator | Jun 2026 |
| 7821 | Older Than Dirt LLC | Weatherford, TX 76086 | Oil & Gas Operator | Jun 2026 |
| 7822 | Oldfield Acquisition LP | Austin, TX 78733 | Oil & Gas Operator | Sep 1996 |
| 7823 | Ole Chaparral On Possum Kingdom | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 1997 |
| 7824 | Ole, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 7825 | Olenox Corp. | Katy, TX 77449 | Oil Operator | Jun 2026 |
| 7826 | Oleum Exploration, LLC | Brodheadsvill, PA 18322 | Oil & Gas Operator | Mar 2023 |
| 7827 | Oleum Operating Company, L.C. | Longview, TX 75606 | Oil & Gas Operator | Dec 2021 |
| 7828 | Oleum Partners, LLC | Frisco, TX 75034 | Oil & Gas Operator | Jun 2026 |
| 7829 | Olifant Energy LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jun 2019 |
| 7830 | Olipdp II, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Jun 2026 |
| 7831 | Oliver Oil & Gas | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 7832 | Olmos Partners, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Jun 2026 |
| 7833 | Olney Oil LLC | Boerne, TX 78006 | Oil Operator | Jun 2026 |
| 7834 | Olney Properties, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2003 |
| 7835 | Olsan Brothers, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Apr 1994 |
| 7836 | Olsen Energy Inc. | Boerne, TX 78006 | Oil & Gas Operator | Jun 2026 |
| 7837 | Olson, S. A. | Kenedy, TX 78119 | Oil & Gas Operator | Aug 1994 |
| 7838 | Oltex Production | Idalou, TX 79329 | Oil & Gas Operator | Jun 2026 |
| 7839 | Omar Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2013 |
| 7840 | Omber Petroleum & Energy Corp. | New Braunfels, TX 78131 | Oil & Gas Operator | Jun 2026 |
| 7841 | Omega Alpha Resources, LLC | Dallas, TX 75219 | Oil Operator | Jun 2026 |
| 7842 | Omega Energy Corp. | Graham, TX 76450 | Oil & Gas Operator | Jun 2026 |
| 7843 | Omega Energy, LLC | Corpus Christ, TX 78418 | Oil & Gas Operator | Jun 2026 |
| 7844 | Omega Operating, Inc. | Odessa, TX 79769 | Oil & Gas Operator | Mar 2001 |
| 7845 | Omimex Energy, Inc. | Fort Worth, TX 76120 | Oil & Gas Operator | Mar 2026 |
| 7846 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 7847 | Omni E & P, Inc. | San Antonio, TX 78229 | Oil Operator | Apr 2010 |
| 7848 | Omni Oil & Gas, Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Oct 2017 |
| 7849 | Omni Operating Company(A) | Dallas, TX 75370 | Oil & Gas Operator | Jun 2026 |
| 7850 | Omni Petroleum Corporation | Austin, TX 78738 | Oil & Gas Operator | Jun 2026 |
| 7851 | Omta Operating LLC | Corpus Christ, TX 78418 | Oil & Gas Operator | Jun 2026 |
| 7852 | On Pointe Operating LLC | Jones, OK 73049 | Oil & Gas Operator | Jun 2026 |
| 7853 | Onaroll Operating LLC | Lubbock, TX 79423 | Oil Operator | Jun 2026 |
| 7854 | One Epoch Energy, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2008 |
| 7855 | One Nickel Operating LLC | Ashland, MA 01721 | Oil Operator | Jun 2026 |
| 7856 | One Tec Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2007 |
| 7857 | One World Operating, LLC | Tampa, FL 33602 | Oil & Gas Operator | Jun 2026 |
| 7858 | Oneok Exploration Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 7859 | Oneok Resources Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 7860 | Onshore Royalties LLC | Houston, TX 77269 | Oil & Gas Operator | Mar 2026 |
| 7861 | Onyx Industries LTD, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Aug 2003 |
| 7862 | Onyx Producing Company, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Mar 2008 |
| 7863 | Opal Operating Company LLC | Edmond, OK 73013 | Oil & Gas Operator | Jun 2026 |
| 7864 | Opal Resources Operating Co.,LLC | Cypress, TX 77429 | Oil & Gas Operator | Jan 2019 |
| 7865 | Opco Oil & Gas Co. | Dallas, TX 75231 | Oil & Gas Operator | Aug 2003 |
| 7866 | Opex Energy, LLC | Houston, TX 77042 | Oil & Gas Operator | Mar 2008 |
| 7867 | Opmi Operating Company | Houston, TX 77057 | Oil & Gas Operator | Jun 2008 |
| 7868 | Ops Group Limited | Houston, TX 77060 | Oil & Gas Operator | Jun 2014 |
| 7869 | Optimum Exploration LLC | Dallas, TX 75254 | Oil & Gas Operator | Jan 2026 |
| 7870 | Orange Petroleum Co. | Orangefield, TX 77639 | Oil & Gas Operator | May 1995 |
| 7871 | Orangefield East Corp | Dallas, TX 75382 | Oil Operator | Jun 2026 |
| 7872 | Orangefield Operating Corporation | Dallas, TX 75382 | Oil Operator | Jun 2026 |
| 7873 | Orbis Energy, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Oct 2001 |
| 7874 | Orbit Crude, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2026 |
| 7875 | Orbit Enterprises, Inc. | Lovington, NM 88260 | Oil & Gas Operator | Mar 2015 |
| 7876 | Orbitron Operating Corp. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1995 |
| 7877 | Orca Operating Company LLC | Houston, TX 77056 | Oil & Gas Operator | Mar 2026 |
| 7878 | Oretta Holdings LLC | Houston, TX 77010 | Oil & Gas Operator | Jun 2026 |
| 7879 | Origin Prod Co Gonzales Prop LLC | New Braunfels, TX 78132 | Oil & Gas Operator | Jun 2026 |
| 7880 | Origin Production Company, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Jun 2026 |
| 7881 | Origin Production Group LLC | Luling, TX 78648 | Oil Operator | Jun 2026 |
| 7882 | Oringderff, Alma Oil Properties | Dallas, TX 75225 | Oil & Gas Operator | Mar 2012 |
| 7883 | Oriole Operating LLC | Wichita Falls, TX 76308 | Oil Operator | Jun 2026 |
| 7884 | Orion Energen Inc. | Austin, TX 78731 | Oil & Gas Operator | Jul 2023 |
| 7885 | Orion Oil & Gas Properties | Amarillo, TX 79109 | Gas Operator | Oct 2000 |
| 7886 | Orion Oil & Gas, LLC | Houston, TX 77042 | Oil & Gas Operator | Oct 2007 |
| 7887 | Orion Oil And Gas Corporation | Houston, TX 77082 | Oil & Gas Operator | Jun 2026 |
| 7888 | Orisol Oil Co. | Houston, TX 77206 | Oil Operator | Jun 2000 |
| 7889 | Orla Petco, Inc. | Midland, TX 79708 | Oil & Gas Operator | Jun 2026 |
| 7890 | Orland Oil & Gas LLC | FT Lauderdale, FL 33305 | Oil Operator | Aug 2024 |
| 7891 | Ormand, Don R. | Midland, TX 79705 | Oil & Gas Operator | Jan 2016 |
| 7892 | Oro Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2026 |
| 7893 | Oro Royalties Operating, LLC | Andrews, TX 79714 | Oil Operator | Jun 2026 |
| 7894 | Orr Production Company | Austin, TX 78746 | Oil & Gas Operator | Dec 2000 |
| 7895 | Orsburn, Wade Inc. | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2002 |
| 7896 | Orson Leasing & Supply | Rockdale, TX 76567 | Oil & Gas Operator | Dec 2006 |
| 7897 | Orth Oil Company, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Jun 2026 |
| 7898 | Orx Resources, L.L.C. | Houston, TX 77067 | Oil & Gas Operator | Jun 2026 |
| 7899 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 7900 | Os&S Operating Inc. | Electra, TX 76360 | Oil & Gas Operator | Jun 2026 |