| 22001 | Ops Group Limited | Houston, TX 77060 | Oil & Gas Operator | Jun 2014 |
| 22002 | Optima Conservation Resources Exploration LLC | | Oil & Gas Operator | Dec 2025 |
| 22003 | Optima Exploration LLC | Tulsa, OK 74116-5664 | Oil & Gas Operator | Mar 2015 |
| 22004 | Optimistic Oil Co. | | Oil & Gas Operator | Dec 1991 |
| 22005 | Optimum Exploration LLC | Dallas, TX 75254 | Oil & Gas Operator | Feb 2026 |
| 22006 | Opubco Resources Of TX Inc | Dallas, TX 75231 | Oil & Gas Operator | Sep 2005 |
| 22007 | Ora Oil Company | | Oil & Gas Operator | May 2017 |
| 22008 | Oracle Oil, LLC | | Oil & Gas Operator | Jul 2013 |
| 22009 | Oracle Resources Oklahoma LP | Dallas, TX 75240-5751 | Oil & Gas Operator | Feb 2008 |
| 22010 | Orange Petroleum Co. | Orangefield, TX 77639 | Oil & Gas Operator | May 1995 |
| 22011 | Orangefield Operating Corporation | Dallas, TX 75382 | Oil Operator | Feb 2026 |
| 22012 | Orason Resources Inc | Tulsa, OK 74169-1225 | Oil & Gas Operator | Nov 2006 |
| 22013 | Orb Exploration, L.L.C. | | Oil & Gas Operator | Jun 2017 |
| 22014 | Orbis Energy, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Oct 2001 |
| 22015 | Orbit Crude, Inc. | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 22016 | Orbit Enterprises, Inc. | Lovington, NM 88260 | Oil & Gas Operator | Mar 2015 |
| 22017 | Orbit Gas Transmission, Inc | Owensboro, KY 42303 | Oil & Gas Operator | Dec 2023 |
| 22018 | Orbit Petroleum, Inc. | Irving, TX 75038 | Oil & Gas Operator | Sep 2010 |
| 22019 | Orbitron Operating Corp. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1995 |
| 22020 | Orbrie Luman | Odessa, TX 79761 | Oil & Gas Operator | Dec 2025 |
| 22021 | Orca Operating Company LLC | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 22022 | Oren Stone | Erick, OK 73645-4542 | Gas Operator | Jun 2022 |
| 22023 | Oretta Holdings LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2026 |
| 22024 | Orgain, John C. | Graham, TX 76450 | Oil & Gas Operator | Jul 1997 |
| 22025 | Organic Energy Company LLC | | Oil & Gas Operator | Jan 2026 |
| 22026 | Origin Prod Co Gonzales Prop LLC | New Braunfels, TX 78132 | Oil & Gas Operator | Feb 2026 |
| 22027 | Origin Production Company, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Feb 2026 |
| 22028 | Origin Production Group LLC | Luling, TX 78648 | Oil Operator | Feb 2026 |
| 22029 | Oringderff, Alma Oil Properties | Dallas, TX 75225 | Oil & Gas Operator | Mar 2012 |
| 22030 | Oriole Operating LLC | Wichita Falls, TX 76308 | Oil Operator | Feb 2026 |
| 22031 | Orion Energen Inc. | Austin, TX 78731 | Oil & Gas Operator | Jul 2023 |
| 22032 | Orion Energy Corp | MT Vernon, IL 62864 | Oil & Gas Operator | Dec 1984 |
| 22033 | Orion Energy Partners LP | Denver, CO 80202 | Oil & Gas Operator | Nov 2010 |
| 22034 | Orion Exploration LLC | Tulsa, OK 74105-5153 | Oil & Gas Operator | Apr 2015 |
| 22035 | Orion Exploration Partners LLC | Tulsa, OK 74105-5153 | Oil & Gas Operator | Nov 2025 |
| 22036 | Orion Oil & Gas Prop | Roswell, NM 88202 | Oil & Gas Operator | Apr 1998 |
| 22037 | Orion Oil & Gas Properties | Amarillo, TX 79109 | Gas Operator | Oct 2000 |
| 22038 | Orion Oil & Gas, LLC | Houston, TX 77042 | Oil & Gas Operator | Oct 2007 |
| 22039 | Orion Oil And Gas Corporation | Houston, TX 77082 | Oil & Gas Operator | Feb 2026 |
| 22040 | Orion Petro Corp | MT Vernon, IL 62864 | Oil & Gas Operator | Dec 2016 |
| 22041 | Orion Resources, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2026 |
| 22042 | Orisol Oil Co. | Houston, TX 77206 | Oil Operator | Jun 2000 |
| 22043 | Orla Petco Inc & Hopi Drilling Co | Midland, TX 79702 | Oil Operator | Sep 2004 |
| 22044 | Orla Petco, Inc. | Midland, TX 79708 | Oil & Gas Operator | Feb 2026 |
| 22045 | Orland Oil & Gas LLC | FT Lauderdale, FL 33305 | Oil Operator | Aug 2024 |
| 22046 | Orleans Exploration Co., Inc. | | Oil & Gas Operator | Aug 1990 |
| 22047 | Orloski John C | Bartlesville, OK 74006 | Oil & Gas Operator | Jun 2025 |
| 22048 | Ormand, Don R. | Midland, TX 79705 | Oil & Gas Operator | Jan 2016 |
| 22049 | Oro Negro Inc. | | Oil & Gas Operator | Dec 2004 |
| 22050 | Oro Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 22051 | Orphan Wells, LLC | Palmhurst, TX 78573 | Oil & Gas Operator | Feb 2026 |
| 22052 | Orr Production Company | Austin, TX 78746 | Oil & Gas Operator | Dec 2000 |
| 22053 | Orr Robert W Jr | Zanesville, OH 43702-2683 | Oil & Gas Operator | Dec 2023 |
| 22054 | Orr, Jr., Donald R. | Batavia, NY 14020 | Gas Operator | Dec 2024 |
| 22055 | Orr, Robert M. | Monahans, TX 79756 | Oil & Gas Operator | Oct 1998 |
| 22056 | Orsburn, Wade Inc. | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2002 |
| 22057 | Orson Leasing & Supply | Rockdale, TX 76567 | Oil & Gas Operator | Dec 2006 |
| 22058 | Orth Oil Company, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Feb 2026 |
| 22059 | Orville S Slaughter Jr | Denver, CO 80205 | Oil & Gas Operator | Aug 2000 |
| 22060 | Orwig Oil Company Inc | Bradenton, FL 34212 | Oil & Gas Operator | Dec 2022 |
| 22061 | Orx Resources, Inc. | | Oil & Gas Operator | Dec 2009 |
| 22062 | Orx Resources, L.L.C. | Houston, TX 77067 | Oil & Gas Operator | Feb 2026 |
| 22063 | Oryx Energy Comp | | Oil & Gas Operator | Apr 1991 |
| 22064 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 22065 | Os&S Operating Inc. | Electra, TX 76360 | Oil & Gas Operator | Feb 2026 |
| 22066 | Osa Oil & Gas LLC | Tulsa, OK 74131 | Oil & Gas Operator | Aug 2023 |
| 22067 | Osage Energy Resources LLC | Bartlesville, OK 74005-2527 | Oil & Gas Operator | Nov 2025 |
| 22068 | Osage Energy, LLC | Colony, KS 66015 | Oil Operator | Aug 2025 |
| 22069 | Osage Exploration & Development Inc | San Diego, CA 92131-3807 | Oil & Gas Operator | Oct 2016 |
| 22070 | Osage Hot Oil Service | Newcastle, WY 82701 | Oil & Gas Operator | Jul 1997 |
| 22071 | Osage Oil & Transportation Inc | Cleveland, OK 74020 | Oil & Gas Operator | Nov 2000 |
| 22072 | Osage Operating Company LLC | Seattle, WA 98133 | Oil Operator | May 2006 |
| 22073 | Osage Partners LLC | | Oil & Gas Operator | Jan 2026 |
| 22074 | Osage Petroleum Corporation | Saint Louis, MO 63131-4691 | Oil & Gas Operator | Mar 2009 |
| 22075 | Osage Resources, LLC | Wichita, KS 67202 | Oil & Gas Operator | May 2025 |
| 22076 | Osair Inc | Mentor, OH 44061 | Oil & Gas Operator | Dec 2021 |
| 22077 | Osborn Energy, LLC | Bucyrus, KS 66013 | Oil & Gas Operator | Jul 2017 |
| 22078 | Osborn Heirs Co | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2025 |
| 22079 | Osborn Heirs Com | | Oil & Gas Operator | May 1995 |
| 22080 | Osborn Heirs Company LTD | San Antonio, TX 78217 | Oil & Gas Operator | Sep 2025 |
| 22081 | Osborn Oil & Gas | | Oil & Gas Operator | Jun 1991 |
| 22082 | Osborn,W.B. Oil & Gas Operations | San Antonio, TX 78217 | Oil & Gas Operator | Feb 2026 |
| 22083 | Osborne Oil Co. | Dallas, TX 75244 | Oil & Gas Operator | Aug 2003 |
| 22084 | Osburn Gerald Dba Ozzy & Son Oil & Gas | Drumright, OK 74030-5467 | Oil Operator | Oct 2020 |
| 22085 | Oscar Oil Company | Iowa Park, TX 76367 | Oil & Gas Operator | Sep 2004 |
| 22086 | Oscar'S Well Service Inc | Okemah, OK 74859 | Oil & Gas Operator | Apr 1998 |
| 22087 | Osceola Oil & Gas Corporation | Somerset, TX 78069 | Oil & Gas Operator | Aug 1994 |
| 22088 | Osci Oil And Gas, Inc. | Parker, KS 66072 | Oil Operator | Jun 1998 |
| 22089 | Oshtah Oil Company LLC | Stratford, OK 74872 | Oil & Gas Operator | Sep 2018 |
| 22090 | Osman Global Services LLC | | Oil & Gas Operator | Jan 2025 |
| 22091 | Oso Energy Company | Houston, TX 77280 | Oil & Gas Operator | Feb 1997 |
| 22092 | Oso Exploration & Production, LLC | Houston, TX 77269 | Oil Operator | Feb 2026 |
| 22093 | Oso Exploration Co. | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2011 |
| 22094 | Oso Oil & Gas Properties LLC | Price, UT 84501 | Gas Operator | Jun 2016 |
| 22095 | Oso Perdido Services LLC | Flatonia, TX 78941 | Oil Operator | Dec 2025 |
| 22096 | Oso Resources LLC | Edmond, OK 73003 | Oil & Gas Operator | Nov 2025 |
| 22097 | Ososki Edward D Dba Federal Oil Company | | Oil Operator | Jun 2016 |
| 22098 | Osprey Petroleum Company, Inc. | Manvel, TX 77578 | Oil & Gas Operator | May 2020 |
| 22099 | Osr Oil & Gas Company | Victoria, TX 77902 | Oil & Gas Operator | Jul 2000 |
| 22100 | Osr Oil & Gas Corp | Midland, TX 79710 | Oil & Gas Operator | Dec 2024 |