| 5101 | Westar Oil & Minerals | | Oil Operator | Feb 1999 |
| 5102 | Westek Resources, Inc. | | Oil & Gas Operator | Jan 2004 |
| 5103 | Western Chief Oil & Gas Company | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 5104 | Western Exploration, Inc. | | Oil Operator | May 1984 |
| 5105 | Western Gas Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 5106 | Western Resources, Inc. | | Oil Operator | Jun 1994 |
| 5107 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 5108 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 5109 | Westport Oil And Gas Company Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2002 |
| 5110 | Westport Petroleum Corporation | | Gas Operator | Sep 1985 |
| 5111 | Wheeler Oil Company | Sperry, OK 74073-9417 | Oil & Gas Operator | Sep 2025 |
| 5112 | Wheless Drilling Company | | Oil & Gas Operator | Dec 1989 |
| 5113 | Wheless Drilling Company Et Al | | Oil & Gas Operator | Dec 1989 |
| 5114 | Wheless DRLG Co &R.M.Bergstein | | Oil Operator | May 1986 |
| 5115 | Wheless Industries, Inc. | Shreveport, LA 71101-5301 | Oil & Gas Operator | Sep 2002 |
| 5116 | Wheless Industries-Pelto Oil | | Oil & Gas Operator | Dec 1989 |
| 5117 | Whiskey Bay Oil Company | | Oil & Gas Operator | May 1990 |
| 5118 | White & Bancroft Et Al | | Oil Operator | Jan 1996 |
| 5119 | White & Ellis Drilling, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 5120 | White Contracting Co., Inc. | | Oil Operator | Jan 1991 |
| 5121 | White Deer Production Co. Inc. | | Oil Operator | Jan 1999 |
| 5122 | White Horse Energy Inc. | | Oil & Gas Operator | Jun 1989 |
| 5123 | White Marlin Operating Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 5124 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Feb 2026 |
| 5125 | White Oil Company | Cement, OK 73017-0515 | Oil Operator | Jun 2002 |
| 5126 | White Operating Co., L.L.C. | | Oil & Gas Operator | Oct 2019 |
| 5127 | White River Operating LLC | Gilmer, TX 75644 | Oil & Gas Operator | Dec 2025 |
| 5128 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Feb 2026 |
| 5129 | White Sands Energy LLC | | Oil Operator | Jan 2025 |
| 5130 | Whitetail Operators LLC | | Oil Operator | Nov 2021 |
| 5131 | Whitewing & Whitewing Oil LLC | | Oil & Gas Operator | May 2004 |
| 5132 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 5133 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 5134 | Whitney Oil & Gas, LLC | | Oil & Gas Operator | Jan 2025 |
| 5135 | Whittier Operating Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2007 |
| 5136 | Whittington Operating Company | Houston, TX 77069 | Oil & Gas Operator | Feb 2026 |
| 5137 | Whitton Company, Inc. | | Oil & Gas Operator | Jul 2020 |
| 5138 | WHK, Inc. | | Oil & Gas Operator | Oct 1993 |
| 5139 | Wichita River Oil Corporation | Englewood, CO 80111 | Oil & Gas Operator | Apr 2009 |
| 5140 | Wicker Oil Co | | Oil & Gas Operator | Feb 1992 |
| 5141 | Wicker, La. Cent. & Clovelly | | Gas Operator | Jul 1983 |
| 5142 | Wilco Oil Gas & Expl. Corp. | | Oil & Gas Operator | Mar 1979 |
| 5143 | Wilcobill Corporation | | Oil Operator | Dec 1986 |
| 5144 | Wilcox Energy Company | | Oil & Gas Operator | Dec 2025 |
| 5145 | Wilcox Operating Company | | Oil Operator | Dec 1989 |
| 5146 | Wilcox Operating Corporation | Shreveport, LA 71115 | Oil & Gas Operator | Feb 2026 |
| 5147 | Wildcat Equipment Co. Inc. | | Oil Operator | Dec 1987 |
| 5148 | Wildcat Midstream Caddo LLC | | Oil Operator | May 2017 |
| 5149 | Wildcat Well Services, LTD. | | Oil Operator | Oct 1989 |
| 5150 | Wildhorse Resources Management Co, LLC | | Oil & Gas Operator | Feb 2018 |
| 5151 | Wildhorse Resources, LLC | Houston, TX 77279 | Oil & Gas Operator | Feb 2015 |
| 5152 | Wilkerson Oil Company | | Oil Operator | Dec 1991 |
| 5153 | Will Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2025 |
| 5154 | Will Haristy, Jr. | | Oil & Gas Operator | Nov 2024 |
| 5155 | Will-Drill Operating, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | Feb 2026 |
| 5156 | Will-Drill Production Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Feb 2026 |
| 5157 | William D. Pittman | | Oil & Gas Operator | Jun 1991 |
| 5158 | William E. Daniels | | Gas Operator | Dec 2013 |
| 5159 | William F. Powell | | Oil & Gas Operator | Jun 1979 |
| 5160 | William Lagnion | | Oil & Gas Operator | Aug 1998 |
| 5161 | William M. Williams | | Oil Operator | May 2018 |
| 5162 | William Marvin Hobbs, SR. | | Oil Operator | Aug 2002 |
| 5163 | Williams Exploration Company | | Oil & Gas Operator | Dec 1986 |
| 5164 | Williams Pressure Service Co. | | Oil Operator | Sep 1985 |
| 5165 | Williams-Cody, Inc. | Houston, TX 77060 | Oil & Gas Operator | May 1994 |
| 5166 | Williams-Robinson | | Oil Operator | Mar 1988 |
| 5167 | Williamson & Smitherman | | Oil & Gas Operator | Dec 2008 |
| 5168 | Williamson Oil & Gas, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Dec 2024 |
| 5169 | Williamson Pumping Ser., Inc. | | Oil Operator | Nov 2024 |
| 5170 | Willow Springs Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 1999 |
| 5171 | Wilson Production Co Of La,Inc | | Oil & Gas Operator | Apr 1991 |
| 5172 | Wilson Well Service | Loco, OK 73442-0114 | Oil & Gas Operator | Mar 2018 |
| 5173 | Win Oil Company | Russell, KS 67665 | Oil & Gas Operator | Jul 2021 |
| 5174 | Winbeau Oil & Gas Co. | | Oil & Gas Operator | Oct 2013 |
| 5175 | Winchester Energy Operating Co. | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 5176 | Winchester Production Company | Shreveport, LA 71129 | Oil & Gas Operator | Nov 2008 |
| 5177 | Windfohr Oil Company | | Oil & Gas Operator | May 1980 |
| 5178 | Windham Oil Company | | Oil & Gas Operator | Dec 1987 |
| 5179 | Windham Oil Corp. | | Oil & Gas Operator | Dec 2024 |
| 5180 | Windrush Operating Co., L.L.C. | Longville, LA 70652 | Oil & Gas Operator | Feb 2026 |
| 5181 | Windrush Operating Company | | Oil & Gas Operator | Jan 2009 |
| 5182 | Windsor Gas Corporation | | Oil & Gas Operator | Aug 1989 |
| 5183 | Wintershall Corporation | | Oil & Gas Operator | Oct 1989 |
| 5184 | Wintershall Oil & Gas Co | | Oil & Gas Operator | Feb 1980 |
| 5185 | Wintershall Oil & Gas Corp | Houston, TX 77027 | Oil & Gas Operator | Jul 1989 |
| 5186 | Winwell, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2007 |
| 5187 | Wisenbaker Production Company | Tyler, TX 75702 | Oil & Gas Operator | Oct 2011 |
| 5188 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 5189 | Witt Oil Production, Inc. | | Oil & Gas Operator | Nov 1984 |
| 5190 | Wle, Inc. | | Oil & Gas Operator | Feb 2012 |
| 5191 | WLS Corporation | | Oil Operator | Aug 2009 |
| 5192 | WM B Hill Production Co | | Oil Operator | Jun 1991 |
| 5193 | WM. H. Kenny Consultants, LTD. | | Oil & Gas Operator | Nov 1991 |
| 5194 | WM. Herbert Hunt TR.Est. | | Oil & Gas Operator | Oct 1992 |
| 5195 | WM. Inabnet | | Gas Operator | Nov 2024 |
| 5196 | WM. T. Burton Industries, Inc. | | Oil & Gas Operator | Apr 1988 |
| 5197 | WM. Zuhone, Jr. | | Oil & Gas Operator | Aug 1988 |
| 5198 | WNR Enterprises', Inc. | | Oil & Gas Operator | Feb 1997 |
| 5199 | Woco La, LLC | | Oil Operator | Jan 2025 |
| 5200 | Wolf Production, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |