| 101 | Oil Patch Operators, LLC | | Oil & Gas Operator | Jul 2005 |
| 102 | Oldfield Operating Corporation | | Oil Operator | Dec 2013 |
| 103 | Opmi Operating Company | Houston, TX 77057 | Oil & Gas Operator | Jun 2008 |
| 104 | Optimistic Oil Co. | | Oil & Gas Operator | Dec 1991 |
| 105 | Parker & Parsley Petroleum Co. | | Oil & Gas Operator | Dec 1990 |
| 106 | Perdido Energy Louisiana, LLC | | Oil & Gas Operator | Dec 2024 |
| 107 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 108 | Petroleum Exchange | | Oil & Gas Operator | Oct 1997 |
| 109 | Phillips Oil Company | Casper, WY 82602 | Oil & Gas Operator | Sep 1986 |
| 110 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 111 | Pine Prairie Oil Co., Inc. | | Oil & Gas Operator | Nov 1983 |
| 112 | Pomfret Production Co., Inc. | | Oil & Gas Operator | Feb 1987 |
| 113 | Power Reserves, Inc. | | Oil Operator | Feb 1999 |
| 114 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 115 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 116 | Quest Exploration L.L.C. | | Oil & Gas Operator | Jul 2014 |
| 117 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 118 | R & B Oil Company, LLC Of Texas | | Oil & Gas Operator | Jan 2025 |
| 119 | Resource Securities Corp. | | Oil & Gas Operator | Mar 2005 |
| 120 | Riceland Petroleum Company | | Oil & Gas Operator | Nov 2024 |
| 121 | Rvo Petroleum Co. | | Oil & Gas Operator | Feb 1982 |
| 122 | S2 Energy Operating LLC | | Oil & Gas Operator | May 2023 |
| 123 | Sevarg Company, Inc. | | Oil & Gas Operator | Feb 2016 |
| 124 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 125 | Sklar & Phillips Oil Co.-Entex | | Oil & Gas Operator | Aug 1978 |
| 126 | Source Petroleum Inc. | San Antonio, TX 78265 | Oil & Gas Operator | Jul 2025 |
| 127 | Southern Production & Expl Co. | | Oil & Gas Operator | Apr 2008 |
| 128 | Southport Exploration Inc | Tulsa, OK 74103-4015 | Oil & Gas Operator | Nov 1998 |
| 129 | SRP Production Corp. | | Oil & Gas Operator | Nov 1997 |
| 130 | Strago Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Aug 1994 |
| 131 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Jul 2025 |
| 132 | Striker Petroleum Corporation | Englewood, CO 80111 | Oil & Gas Operator | Dec 1999 |
| 133 | Sun Exploration-Production Co. | | Oil & Gas Operator | Jan 1990 |
| 134 | Swag Oil And Gas Company, Inc. | | Oil & Gas Operator | Jul 1982 |
| 135 | SWN Production (Louisiana), LLC | | Oil & Gas Operator | Dec 2024 |
| 136 | Tabco Exploration Inc. | New Orleans, LA 70131 | Oil & Gas Operator | Dec 1998 |
| 137 | Tana Exploration Company LLC | Dallas, TX 75219 | Oil & Gas Operator | Aug 2021 |
| 138 | TDX Energy, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 139 | Teal Petroleum Co. | | Oil & Gas Operator | Sep 1978 |
| 140 | Tensas Delta Expl Co., LLC | Shreveport, LA 71101-5323 | Oil & Gas Operator | Jul 2021 |
| 141 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Jul 2025 |
| 142 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 143 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 144 | Texas Pacific Oil Company Inc. | | Oil & Gas Operator | Dec 1980 |
| 145 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 146 | Tiger Petroleum | | Oil Operator | Sep 2002 |
| 147 | Toce Energy, L.L.C. | | Oil & Gas Operator | Dec 2017 |
| 148 | Toce Oil Company | | Oil & Gas Operator | Dec 2014 |
| 149 | Tom Littlepage Oil Properties | | Oil & Gas Operator | Dec 1984 |
| 150 | Trace Operators, Inc. | | Oil & Gas Operator | Nov 2024 |
| 151 | Transcontinental Gas P/L Corp. | | Oil & Gas Operator | Dec 2009 |
| 152 | Transcontinental Gas Pipeline Co LLC | | Oil Operator | Jan 2025 |
| 153 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 154 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Jul 2025 |
| 155 | Vaquero Resources, LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 156 | Vaughn Petroleum, Inc. | Dallas, TX 75219 | Oil & Gas Operator | May 2004 |
| 157 | Ventex Operating Corp. | Addison, TX 75001 | Oil & Gas Operator | Jul 2025 |
| 158 | Vernon E. Faulconer | | Oil & Gas Operator | Dec 1996 |
| 159 | Vernon E. Faulconer, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2024 |
| 160 | Vibe Resources LLC | | Oil & Gas Operator | Dec 2024 |
| 161 | Vinbar Oil & Gas, LLC | | Oil & Gas Operator | Jan 2018 |
| 162 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Apr 2025 |
| 163 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 164 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 165 | Whitton Company, Inc. | | Oil & Gas Operator | Jul 2020 |
| 166 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 167 | Zachry Exploration, LLC | San Antonio, TX 78224 | Oil & Gas Operator | Jul 2025 |
| 168 | Zadeck Energy Group Inc | | Oil & Gas Operator | Dec 2011 |