| 21001 | Overton Park Oil & Gas LP | Fort Worth, TX 76109 | Oil & Gas Operator | Apr 2026 |
| 21002 | Ovintiv Mid-Continent Inc. | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Feb 2026 |
| 21003 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | Apr 2026 |
| 21004 | Owco Production Co., Inc. | | Oil Operator | Aug 1997 |
| 21005 | Owen Production Co | | Oil Operator | May 2001 |
| 21006 | Owen'S Pumping Service | | Oil Operator | Dec 2025 |
| 21007 | Owen, Matthew | Hamilton, KS 66853 | Oil Operator | Sep 2016 |
| 21008 | Owens James W | Tulsa, OK 74114-1425 | Oil & Gas Operator | Oct 2022 |
| 21009 | Owens Oil | | Oil Operator | Dec 2000 |
| 21010 | Owens Oil Company | Iowa Park, TX 76367 | Oil & Gas Operator | Sep 2008 |
| 21011 | Owens Oil Company, LLC | Yates Center, KS 66783 | Oil Operator | Dec 2025 |
| 21012 | Owens Pet Inc | Midland, TX 79702 | Oil & Gas Operator | Aug 1995 |
| 21013 | Owens Petroleum | | Oil Operator | May 2006 |
| 21014 | Owens Petroleum LLC | Yates Center, KS 66783 | Oil & Gas Operator | Dec 2025 |
| 21015 | Owens Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 1995 |
| 21016 | Owi Operating Co. LC | Ottawa, KS 66067 | Oil & Gas Operator | Dec 2009 |
| 21017 | Owl Creek Operating Co., Inc. | Denver, CO 80206 | Oil & Gas Operator | Apr 2026 |
| 21018 | Owl Creek Production Co., Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2006 |
| 21019 | Owl Creek Production Co., LLC | Denver, CO 80265 | Oil & Gas Operator | Jan 2006 |
| 21020 | Owl Operating Ventures L.L.C. | Midland, TX 79708 | Oil & Gas Operator | Dec 2022 |
| 21021 | Owl Ops II LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 21022 | Owl Ops LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 21023 | Own Resources Operating LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jan 2026 |
| 21024 | Ows Acquisition Co LLC | Louisville, OH 44641 | Oil & Gas Operator | Dec 2024 |
| 21025 | Ows Energy LLC | Carlton, PA 16311-1605 | Oil & Gas Operator | Feb 2026 |
| 21026 | Ows Energy, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | Apr 2026 |
| 21027 | Oxbow EP LLC | Mathis, TX 78368 | Oil Operator | Apr 2026 |
| 21028 | Oxbow Oil Company,A Kansas General Partnership | Grenola, KS 67346 | Oil Operator | Apr 2015 |
| 21029 | Oxbow Petroleum, LLC | Midland, TX 79703 | Oil & Gas Operator | May 2025 |
| 21030 | Oxbow Properties Inc | Centennial, CO 80122-1422 | Oil & Gas Operator | Jan 2025 |
| 21031 | Oxco, LLC | | Oil & Gas Operator | Feb 2015 |
| 21032 | Oxenergy Incorporated | Flower Mound, TX 75022 | Oil & Gas Operator | Apr 2026 |
| 21033 | Oxford Explorati | | Oil & Gas Operator | Mar 1993 |
| 21034 | Oxford Exploration | | Oil Operator | Apr 1988 |
| 21035 | Oxford Exploration Company | Denver, CO 80237 | Oil & Gas Operator | Aug 1995 |
| 21036 | Oxford Oil | Zanesville, OH 43702 | Oil & Gas Operator | Dec 2012 |
| 21037 | Oxford Oil Co. | Rockdale, TX 76567 | Oil & Gas Operator | Aug 2004 |
| 21038 | Oxford Oil Inc | Cleveland, OK 74020 | Oil & Gas Operator | Feb 1997 |
| 21039 | Oxley Energy LLC | Houston, TX 77042 | Gas Operator | Jan 2026 |
| 21040 | Oxley John C | Tulsa, OK 74103 | Oil & Gas Operator | Sep 1996 |
| 21041 | Oxley Petroleum | Tulsa, OK 74119-3609 | Oil & Gas Operator | Jan 2020 |
| 21042 | Oxley Petroleum Company | Oklahoma City, OK 73118-1044 | Oil & Gas Operator | Sep 2017 |
| 21043 | Oxson Co. | Uvalde, TX 78802 | Gas Operator | Apr 2026 |
| 21044 | Oxtex Inc | | Oil & Gas Operator | Oct 1989 |
| 21045 | Oxxn | Weatherford, TX 76086 | Oil & Gas Operator | Oct 2023 |
| 21046 | Oxy Little Knife, LLC | | Oil & Gas Operator | Jan 2016 |
| 21047 | Oxy Petroleum Inc | | Oil & Gas Operator | Jan 1986 |
| 21048 | Oxy USA | | Oil Operator | Apr 1992 |
| 21049 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 21050 | Oxy USA WTP Limited Partnership | Houston, TX 772104294 | Oil & Gas Operator | Feb 2026 |
| 21051 | Oxy USA WTP LP | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 21052 | Oxyrock Operating, LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 21053 | Oz Gas Corporation | Tomball, TX 77377 | Gas Operator | Apr 2026 |
| 21054 | Oz Gas LTD | Tidioute, PA 16351-2648 | Oil & Gas Operator | Dec 2016 |
| 21055 | Ozark Enterprise | | Oil Operator | Nov 1990 |
| 21056 | Ozark Exploration, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Apr 2026 |
| 21057 | Ozark Oil Corporation | Springfield, MO 65804 | Oil & Gas Operator | Oct 1992 |
| 21058 | Ozark Production Company, Inc. | | Oil & Gas Operator | Jan 2025 |
| 21059 | Oztx Oil & Gas, L.L.C. | Ozona, TX 76943 | Oil & Gas Operator | Apr 2026 |
| 21060 | Ozzo Corporation, The | Bedford, TX 76021 | Oil Operator | Apr 2026 |
| 21061 | P & A Oilfield Services, Inc. | | Oil & Gas Operator | Jan 1998 |
| 21062 | P & A Operating, Inc. | Kerrville, TX 78028 | Oil & Gas Operator | Apr 2026 |
| 21063 | P & A Well Service | | Oil & Gas Operator | Jan 1994 |
| 21064 | P & C Energy Co | Allegany, NY 14706-9615 | Oil Operator | Dec 2015 |
| 21065 | P & C Oil & Gas, Inc. | Linn, WV 26384 | Oil & Gas Operator | Dec 2021 |
| 21066 | P & C Oil Company | Leona, TX 75850 | Oil & Gas Operator | Dec 2025 |
| 21067 | P & C Petroleum, LLC | Shawnee, KS 66226 | Oil Operator | Dec 2025 |
| 21068 | P & D Valentine Oil Co | New Matamoras, OH 45767 | Oil & Gas Operator | Dec 2018 |
| 21069 | P & E Oil | | Oil & Gas Operator | Dec 2024 |
| 21070 | P & F Operating, LLC | Dallas, TX 75206 | Oil & Gas Operator | Apr 2026 |
| 21071 | P & H Construction Inc | Wewoka, OK 74884 | Oil & Gas Operator | Jun 2024 |
| 21072 | P & H Oil & Gas Inc | Stroud, OK 74079 | Oil & Gas Operator | Feb 2026 |
| 21073 | P & H Vacuum Service | | Oil & Gas Operator | Jan 2025 |
| 21074 | P & J Resources, Inc | | Oil & Gas Operator | Dec 2013 |
| 21075 | P & M Construction | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 21076 | P & M Drilling Company Inc | Depew, OK 74028 | Oil & Gas Operator | Dec 2004 |
| 21077 | P & M Energy, A General Partnership | Johnson, KS 67855 | Gas Operator | Sep 2003 |
| 21078 | P & M Oil Company | Hays, KS 67601 | Oil & Gas Operator | Dec 2025 |
| 21079 | P & M Petroleum | | Oil Operator | Mar 1998 |
| 21080 | P & M Petroleum Management | Denver, CO BAD ADDR | Oil & Gas Operator | Apr 2010 |
| 21081 | P & M Petroleum Management LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 21082 | P & P Petroleum | Midland, TX 79706 | Oil & Gas Operator | Oct 2002 |
| 21083 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 21084 | P & R Oil Company | Post, TX 79356 | Oil & Gas Operator | Apr 2026 |
| 21085 | P & S Energy Inc | Mineral Ridge, OH 44440 | Oil & Gas Operator | Dec 2019 |
| 21086 | P & S Oil And Gas Corporation | | Gas Operator | Dec 1996 |
| 21087 | P & S Production LLC | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2013 |
| 21088 | P & W Oil | Lakewood, CO 80215 | Oil Operator | Sep 1985 |
| 21089 | P & W Well Service Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2026 |
| 21090 | P & WG Resources L.L.C. | Batson, TX 77519 | Oil & Gas Operator | Jan 2011 |
| 21091 | P A Energy Inc | Calvin, OK 74531-0248 | Oil & Gas Operator | Apr 2020 |
| 21092 | P D Parker | | Oil & Gas Operator | Aug 1985 |
| 21093 | P F Beeler LLC | Norman, OK 73072-7522 | Oil & Gas Operator | Jan 2026 |
| 21094 | P J Oil Co. | | Oil Operator | Dec 2025 |
| 21095 | P K & L Oil Properties | Shawnee, OK 74802-0931 | Oil & Gas Operator | Mar 2001 |
| 21096 | P O & G Panhandle LP | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 21097 | P P & G Oil | Pickerington, OH 43147 | Oil & Gas Operator | Dec 2024 |
| 21098 | P T C, Inc | Raccoon, KY 41557 | Gas Operator | Dec 2023 |
| 21099 | P T Oil Co Inc | Walters, OK 73572-9505 | Oil Operator | Nov 2014 |
| 21100 | P&F Operations, LLC | Thrall, TX 76578 | Oil Operator | Apr 2026 |