| 8001 | Orbis Energy, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Oct 2001 |
| 8002 | Orbit Crude, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 8003 | Orbit Enterprises, Inc. | Lovington, NM 88260 | Oil & Gas Operator | Mar 2015 |
| 8004 | Orbitron Operating Corp. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1995 |
| 8005 | Orca Operating Company LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2025 |
| 8006 | Oretta Holdings LLC | Houston, TX 77010 | Oil & Gas Operator | Dec 2025 |
| 8007 | Origin Prod Co Gonzales Prop LLC | New Braunfels, TX 78132 | Oil & Gas Operator | Dec 2025 |
| 8008 | Origin Production Company, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Dec 2025 |
| 8009 | Origin Production Group LLC | Luling, TX 78648 | Oil Operator | Dec 2025 |
| 8010 | Oringderff, Alma Oil Properties | Dallas, TX 75225 | Oil & Gas Operator | Mar 2012 |
| 8011 | Oriole Operating LLC | Wichita Falls, TX 76308 | Oil Operator | Dec 2025 |
| 8012 | Orion Energen Inc. | Austin, TX 78731 | Oil & Gas Operator | Jul 2023 |
| 8013 | Orion Oil & Gas Properties | Amarillo, TX 79109 | Gas Operator | Oct 2000 |
| 8014 | Orion Oil & Gas, LLC | Houston, TX 77042 | Oil & Gas Operator | Oct 2007 |
| 8015 | Orion Oil And Gas Corporation | Houston, TX 77082 | Oil & Gas Operator | Dec 2025 |
| 8016 | Orisol Oil Co. | Houston, TX 77206 | Oil Operator | Jun 2000 |
| 8017 | Orla Petco, Inc. | Midland, TX 79708 | Oil & Gas Operator | Dec 2025 |
| 8018 | Orland Oil & Gas LLC | FT Lauderdale, FL 33305 | Oil Operator | Aug 2024 |
| 8019 | Ormand, Don R. | Midland, TX 79705 | Oil & Gas Operator | Jan 2016 |
| 8020 | Oro Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 8021 | Orr Production Company | Austin, TX 78746 | Oil & Gas Operator | Dec 2000 |
| 8022 | Orr, Robert M. | Monahans, TX 79756 | Oil & Gas Operator | Oct 1998 |
| 8023 | Orsburn, Wade Inc. | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2002 |
| 8024 | Orson Leasing & Supply | Rockdale, TX 76567 | Oil & Gas Operator | Dec 2006 |
| 8025 | Orth Oil Company, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Dec 2025 |
| 8026 | Orx Resources, L.L.C. | Houston, TX 77067 | Oil & Gas Operator | Dec 2025 |
| 8027 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 8028 | Os&S Operating Inc. | Electra, TX 76360 | Oil & Gas Operator | Dec 2025 |
| 8029 | Osborn Heirs Co | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 8030 | Osborn,W.B. Oil & Gas Operations | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2025 |
| 8031 | Osborne Oil Co. | Dallas, TX 75244 | Oil & Gas Operator | Aug 2003 |
| 8032 | Oscar Oil Company | Iowa Park, TX 76367 | Oil & Gas Operator | Sep 2004 |
| 8033 | Osceola Oil & Gas Corporation | Somerset, TX 78069 | Oil & Gas Operator | Aug 1994 |
| 8034 | Oso Exploration & Production, LLC | Houston, TX 77269 | Oil Operator | Dec 2025 |
| 8035 | Oso Exploration Co. | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2011 |
| 8036 | Osprey Petroleum Company, Inc. | Manvel, TX 77578 | Oil & Gas Operator | May 2020 |
| 8037 | Osr Oil & Gas Company | Victoria, TX 77902 | Oil & Gas Operator | Jul 2000 |
| 8038 | Osr Oil & Gas Corp | Midland, TX 79710 | Oil & Gas Operator | Dec 2024 |
| 8039 | Ostrich Oil & Gas, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 8040 | Oswego, Inc. | Amarillo, TX 79109 | Oil & Gas Operator | Jun 2004 |
| 8041 | Osyka Oil & Gas, Inc. | Metairie, LA 70004 | Oil & Gas Operator | Dec 2025 |
| 8042 | Osyka Permian, LLC | Houston, TX 77079 | Oil & Gas Operator | Dec 2025 |
| 8043 | Osyka Producing Company, Inc. | Houston, TX 77242 | Oil & Gas Operator | Dec 2025 |
| 8044 | Otb Operating, LLC | Stanton, TX 79782 | Oil & Gas Operator | Dec 2025 |
| 8045 | Otc Petroleum Corporation | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2015 |
| 8046 | Otex LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Dec 2025 |
| 8047 | Otex Resources LLC | Baytown, TX 77520 | Oil & Gas Operator | Dec 2025 |
| 8048 | Oto, Co. | Woodward, OK 73802 | Oil & Gas Operator | Jun 1998 |
| 8049 | Ouachita Exploration Inc | Chickasha, OK 73018 | Oil & Gas Operator | Aug 2025 |
| 8050 | Ouida Oil | Rowlett, TX 75030 | Oil & Gas Operator | Mar 2008 |
| 8051 | Outlaw Oil LLC | Caldwell, TX 77836 | Oil & Gas Operator | Dec 2025 |
| 8052 | Outline Oil Company LLC | Beeville, TX 78104 | Oil Operator | Dec 2025 |
| 8053 | Outline Oil Corp. | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2025 |
| 8054 | Ouut Investing LLC | Mineral Wells, TX 76068 | Oil Operator | Mar 2020 |
| 8055 | Ovation Energy II, LP | Houston, TX 77279 | Oil & Gas Operator | Jun 2011 |
| 8056 | Ovation Energy, LP | N Richlnd HLS, TX 76180 | Oil & Gas Operator | Sep 2004 |
| 8057 | Overflow Energy, LLC | Perryton, TX 79070 | Oil & Gas Operator | Dec 2025 |
| 8058 | Overland Operating Company, LLC | Abilene, TX 79601 | Oil Operator | Dec 2025 |
| 8059 | Overly Operating Co. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2013 |
| 8060 | Overstreet, Jamie L | Hondo, TX 78861 | Oil & Gas Operator | Dec 2025 |
| 8061 | Overton Park Oil & Gas LP | Fort Worth, TX 76109 | Oil & Gas Operator | Dec 2025 |
| 8062 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 8063 | Owens Oil Company | Iowa Park, TX 76367 | Oil & Gas Operator | Sep 2008 |
| 8064 | Owens Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 1995 |
| 8065 | Owl Creek Operating Co., Inc. | Denver, CO 80206 | Oil & Gas Operator | Dec 2025 |
| 8066 | Owl Creek Production Co., Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2006 |
| 8067 | Owl Creek Production Co., LLC | Denver, CO 80265 | Oil & Gas Operator | Jan 2006 |
| 8068 | Owl Operating Ventures L.L.C. | Midland, TX 79708 | Oil & Gas Operator | Dec 2022 |
| 8069 | Owl Ops II LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 8070 | Owl Ops LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 8071 | Own Resources Operating LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Sep 2025 |
| 8072 | Ows Energy, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | Dec 2025 |
| 8073 | Oxbow EP LLC | Mathis, TX 78368 | Oil Operator | Dec 2025 |
| 8074 | Oxbow Petroleum, LLC | Midland, TX 79703 | Oil & Gas Operator | May 2025 |
| 8075 | Oxenergy Incorporated | Flower Mound, TX 75022 | Oil & Gas Operator | Dec 2025 |
| 8076 | Oxford Exploration Company | Denver, CO 80237 | Oil & Gas Operator | Aug 1995 |
| 8077 | Oxford Oil Co. | Rockdale, TX 76567 | Oil & Gas Operator | Aug 2004 |
| 8078 | Oxson Co. | Uvalde, TX 78802 | Gas Operator | Dec 2025 |
| 8079 | Oxxn | Weatherford, TX 76086 | Oil & Gas Operator | Oct 2023 |
| 8080 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 8081 | Oxy USA WTP LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 8082 | Oxyrock Operating, LLC | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 8083 | Oz Gas Corporation | Austin, TX 78746 | Gas Operator | Dec 2025 |
| 8084 | Ozark Exploration, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Dec 2025 |
| 8085 | Oztx Oil & Gas, L.L.C. | Ozona, TX 76943 | Oil & Gas Operator | Dec 2025 |
| 8086 | Ozzo Corporation, The | Bedford, TX 76021 | Oil Operator | Dec 2025 |
| 8087 | P & A Operating, Inc. | Kerrville, TX 78028 | Oil & Gas Operator | Dec 2025 |
| 8088 | P & C Oil Company | Leona, TX 75850 | Oil & Gas Operator | Sep 2025 |
| 8089 | P & M Construction | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 8090 | P & M Petroleum Management LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 8091 | P & P Petroleum | Midland, TX 79706 | Oil & Gas Operator | Oct 2002 |
| 8092 | P & R Oil Company | Post, TX 79356 | Oil & Gas Operator | Dec 2025 |
| 8093 | P & W Well Service Inc. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 8094 | P & WG Resources L.L.C. | Batson, TX 77519 | Oil & Gas Operator | Jan 2011 |
| 8095 | P&F Operations, LLC | Thrall, TX 76578 | Oil Operator | Dec 2025 |
| 8096 | P&P Industries, Inc. | Austin, TX 78737 | Oil & Gas Operator | Dec 2002 |
| 8097 | P,B&B Operating Inc. | Coleman, TX 76834 | Oil & Gas Operator | Dec 2025 |
| 8098 | P-2 Exploration Co. | Amarillo, TX 79124 | Oil & Gas Operator | Feb 2005 |
| 8099 | P-K Oil Co. | Olney, TX 76374 | Oil & Gas Operator | Aug 2003 |
| 8100 | P-R-O Management, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |