| 8001 | O'Sullivan Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2000 |
| 8002 | O'Tool Oil & Gas, LLC | Dallas, TX 75219 | Oil & Gas Operator | Feb 2026 |
| 8003 | O. H. B. Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Sep 2019 |
| 8004 | O. H. M. Operating | Pampa, TX 79065 | Oil & Gas Operator | Feb 2026 |
| 8005 | O.G.O. Refining | Luling, TX 78648 | Oil & Gas Operator | Jun 2013 |
| 8006 | O.G.P. Operating, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Feb 2026 |
| 8007 | O.K. Mikeal Joint Venture | Wilmington, DE 19803 | Oil & Gas Operator | Jun 2012 |
| 8008 | O.T. Oil | Kilgore, TX 75663 | Oil Operator | Feb 2026 |
| 8009 | Oahe Oil Company | Texline, TX 79087 | Oil & Gas Operator | May 2004 |
| 8010 | Oak Energy, LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2026 |
| 8011 | Oak Hills Drilling & Oper., LLC | Holdenville, OK 74848 | Oil & Gas Operator | May 2013 |
| 8012 | Oak Prairie Operations, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2026 |
| 8013 | Oak Resources Inc | Tulsa, OK 74153 | Oil & Gas Operator | Aug 2013 |
| 8014 | Oak Valley Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2015 |
| 8015 | Oakland Petroleum Oper Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 8016 | Oakmont Oil And Gas | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 8017 | Oakridge Energy, Inc. | Wichita Falls, TX 76302 | Oil & Gas Operator | Feb 2026 |
| 8018 | Oakridge Oil And Gas, LP | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2026 |
| 8019 | Oaktree Oil Company | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 8020 | Oakwood Energy, Inc. | Jourdanton, TX 78026 | Oil & Gas Operator | Mar 2023 |
| 8021 | Oasis Operating, Inc. | Lubbock, TX 79404 | Oil & Gas Operator | Nov 2020 |
| 8022 | Oasis Petroleum Permian LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 8023 | Oates, John Co., Inc. | Stinnett, TX 79083 | Oil & Gas Operator | Feb 2026 |
| 8024 | Obax Oil And Gas LLC | Saint Louis, MO 63131 | Oil Operator | Feb 2026 |
| 8025 | Oblaen Resources LLC | Wallis, TX 77485 | Oil & Gas Operator | Feb 2026 |
| 8026 | Occam Petroleum E&P, LLC | Meeker, OK 74855 | Oil Operator | Feb 2026 |
| 8027 | Occidental Energy Company, Inc. | Houston, TX 77282 | Oil & Gas Operator | Jul 2021 |
| 8028 | Occidental Energy Marketing, Inc. | Houston, TX 77227 | Gas Operator | Sep 2015 |
| 8029 | Occidental Permian LTD. | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 8030 | Occidental W TX Overthrust, Inc. | Houston, TX 77210 | Oil & Gas Operator | Dec 2021 |
| 8031 | Ocean Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 8032 | Ocotillo Energy Resources, LLC | Odessa, TX 79765 | Oil Operator | Feb 2026 |
| 8033 | Octane Energy Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 8034 | Odegard Energy, Inc. | Houston, TX 77024 | Oil & Gas Operator | Jul 2020 |
| 8035 | Oden, Robin H., Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 1994 |
| 8036 | Odessa Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 8037 | Odessa Oil Investment Co., Inc. | Odessa, TX 79762 | Oil & Gas Operator | Nov 2016 |
| 8038 | Odom, R. H. | Snyder, TX 79550 | Oil & Gas Operator | Jun 1996 |
| 8039 | Odum Oil & Gas Co. | Harper, TX 78631 | Oil & Gas Operator | Feb 2026 |
| 8040 | Odyssey Operating Company | Shreveport, LA 71106 | Oil & Gas Operator | Sep 2020 |
| 8041 | Odyssey Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Apr 1995 |
| 8042 | Oexco, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 8043 | Offset Oil & Gas | Big Spring, TX 79720 | Oil & Gas Operator | Aug 2003 |
| 8044 | Offshore Group, Inc. The | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 8045 | Offshore Oil & Gas Inc | Houston, TX 77063 | Oil & Gas Operator | Sep 1994 |
| 8046 | Oft Inc. | Houston, TX 77079 | Oil & Gas Operator | Feb 2026 |
| 8047 | Og Co., Inc. | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 8048 | Oga Operating L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Jan 2000 |
| 8049 | Ogden Resources Corporation | Bryan, TX 77805 | Oil & Gas Operator | Feb 2026 |
| 8050 | Ogden Resources, LTD. | Bryan, TX 77802 | Oil & Gas Operator | Feb 2009 |
| 8051 | Ogog Operating, LLC | Dallas, TX 75367 | Oil & Gas Operator | Feb 2026 |
| 8052 | Ogris Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 8053 | Ogs Operating Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2008 |
| 8054 | Ogx Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 8055 | Ogx Resources LLC | Midland, TX 79702 | Oil & Gas Operator | Oct 2011 |
| 8056 | Ohlhausen Oil Company | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 8057 | Oil & Gas Acquisition Group Inc | Austin, TX 78716 | Oil & Gas Operator | May 2003 |
| 8058 | Oil & Gas Field Services LLC | San Felipe, TX 77473 | Oil & Gas Operator | Apr 2007 |
| 8059 | Oil & Gas Operations | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 8060 | Oil & Gas Properties | Midland, TX 79704 | Oil & Gas Operator | Feb 2026 |
| 8061 | Oil & Gas Property MGMT., Inc. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1996 |
| 8062 | Oil Coast Corp. | S Houston, TX 77587 | Oil & Gas Operator | Feb 2026 |
| 8063 | Oil Lease Operating Co. | Coldspring, TX 77331 | Oil & Gas Operator | Aug 2003 |
| 8064 | Oil Management Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2022 |
| 8065 | Oil Patch Operators Co., L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 8066 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | Feb 2026 |
| 8067 | Oil Projects, LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2026 |
| 8068 | Oil Rock Resources, LLC | Weatherford, TX 76088 | Oil & Gas Operator | Jan 2024 |
| 8069 | Oil Well Buyers Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 2024 |
| 8070 | Oil, Gas, Etc. LLC | Katy, TX 77449 | Oil & Gas Operator | Feb 2026 |
| 8071 | Oil-X Corp., The | FT Stockton, TX 79735 | Oil & Gas Operator | Feb 2026 |
| 8072 | Oilex Int'L Investments, Inc. | Luling, TX 78648 | Oil & Gas Operator | Feb 2026 |
| 8073 | Oilfield Management, Inc. (A) | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 8074 | Oilrox Resources LLC | San Antonio, TX 78258 | Oil & Gas Operator | Dec 2025 |
| 8075 | Oilton Resources, Inc. | Laredo, TX 78041 | Oil & Gas Operator | Feb 2026 |
| 8076 | Oilwell Operators, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Feb 2026 |
| 8077 | Oily Dog Operators Texas, LLC | Allen, TX 75002 | Oil Operator | Feb 2026 |
| 8078 | Ojai Oil Company | Camarillo, CA 93012 | Oil & Gas Operator | Nov 2025 |
| 8079 | Ojb, Inc. | Buda, TX 78610 | Oil & Gas Operator | Mar 2013 |
| 8080 | Ojt, LLC | Richmond, TX 77469 | Oil Operator | Feb 2026 |
| 8081 | Ok Arena Operating Company | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2026 |
| 8082 | Ok Oil Company, Inc. | Bivins, TX 75555 | Oil & Gas Operator | Feb 2013 |
| 8083 | Okie Crude Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 8084 | Okie Operating Company, LTD. | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 8085 | Okla. Magic Circle Energy Corp. | Shawnee, OK 74801 | Oil & Gas Operator | Jul 2004 |
| 8086 | Oklahoma Arrowhead Energy, Inc. | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 1996 |
| 8087 | Oklahoma Ea II, L.L.C. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2004 |
| 8088 | Oklahoma Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Feb 2020 |
| 8089 | Oklahoma Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2013 |
| 8090 | Oklahoma Operating Company | Midland, TX 79708 | Oil & Gas Operator | Feb 2026 |
| 8091 | Oklahoma Operating, LLC | Holliday, TX 76366 | Oil Operator | Nov 2003 |
| 8092 | Oklahoma RB Operating Company | Midland, TX 79701 | Oil & Gas Operator | Jan 1998 |
| 8093 | Oklahoma Sterling Oil & Gas Corp | Tulsa, OK 74170 | Oil & Gas Operator | Jun 1997 |
| 8094 | Oklatex Energy, Inc. | Beaumont, TX 77702 | Oil Operator | Feb 2026 |
| 8095 | Okmar Oil Company | Marietta, OH 45750 | Oil & Gas Operator | Jun 2005 |
| 8096 | Okreek Oil Company | Weatherford, TX 76086 | Oil & Gas Operator | Feb 2026 |
| 8097 | Okt Resources, LLC | Edmond, OK 73013 | Oil & Gas Operator | Feb 2026 |
| 8098 | Oky Investments, Inc. | Edmond, OK 73013 | Oil & Gas Operator | Sep 2021 |
| 8099 | Ol' Boys Operations LLC | Pampa, TX 79065 | Oil & Gas Operator | Feb 2026 |
| 8100 | Old Cedron, L.L.C. | Lubbock, TX 79410 | Oil & Gas Operator | May 2004 |