| 4901 | Westar Energy, Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 4902 | Westar Oil & Minerals | | Oil Operator | Feb 1999 |
| 4903 | Westek Resources, Inc. | | Oil & Gas Operator | Jan 2004 |
| 4904 | Western Chief Oil & Gas Company | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 4905 | Western Exploration, Inc. | | Oil Operator | May 1984 |
| 4906 | Western Gas Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 4907 | Western Resources, Inc. | | Oil Operator | Jun 1994 |
| 4908 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 4909 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 4910 | Westport Oil And Gas Company Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2002 |
| 4911 | Wheeler Oil Company | Sperry, OK 74073-9417 | Oil & Gas Operator | May 2026 |
| 4912 | Wheless Drilling Company | | Oil & Gas Operator | Dec 1989 |
| 4913 | Wheless Drilling Company Et Al | | Oil & Gas Operator | Dec 1989 |
| 4914 | Wheless DRLG Co &R.M.Bergstein | | Oil Operator | May 1986 |
| 4915 | Wheless Industries, Inc. | Shreveport, LA 71101-5301 | Oil & Gas Operator | Sep 2002 |
| 4916 | Wheless Industries-Pelto Oil | | Oil & Gas Operator | Dec 1989 |
| 4917 | Whiskey Bay Oil Company | | Oil & Gas Operator | May 1990 |
| 4918 | White & Bancroft Et Al | | Oil Operator | Jan 1996 |
| 4919 | White & Ellis Drilling, Inc. | Wichita, KS 67206 | Oil & Gas Operator | May 2026 |
| 4920 | White Contracting Co., Inc. | | Oil Operator | Jan 1991 |
| 4921 | White Deer Production Co. Inc. | | Oil Operator | Jan 1999 |
| 4922 | White Horse Energy Inc. | | Oil & Gas Operator | Jun 1989 |
| 4923 | White Marlin Operating Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 4924 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Sep 2026 |
| 4925 | White Oil Company | Cement, OK 73017-0515 | Oil Operator | Jun 2002 |
| 4926 | White Operating Co., L.L.C. | | Oil & Gas Operator | Oct 2019 |
| 4927 | White River Operating LLC | Gilmer, TX 75644 | Oil & Gas Operator | May 2026 |
| 4928 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Sep 2026 |
| 4929 | White Sands Energy LLC | | Oil Operator | Jan 2025 |
| 4930 | Whitetail Operators LLC | | Oil Operator | Nov 2021 |
| 4931 | Whitewing & Whitewing Oil LLC | | Oil & Gas Operator | May 2004 |
| 4932 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 4933 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 4934 | Whitney Oil & Gas, LLC | | Oil & Gas Operator | Jan 2025 |
| 4935 | Whittier Operating Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2007 |
| 4936 | Whittington Operating Company | Houston, TX 77069 | Oil & Gas Operator | Sep 2026 |
| 4937 | Whitton Company, Inc. | | Oil & Gas Operator | Jul 2020 |
| 4938 | WHK, Inc. | | Oil & Gas Operator | Oct 1993 |
| 4939 | Wichita River Oil Corporation | Englewood, CO 80111 | Oil & Gas Operator | Apr 2009 |
| 4940 | Wicker Oil Co | | Oil & Gas Operator | Feb 1992 |
| 4941 | Wicker, La. Cent. & Clovelly | | Gas Operator | Jul 1983 |
| 4942 | Wilco Oil Gas & Expl. Corp. | | Oil & Gas Operator | Mar 1979 |
| 4943 | Wilcobill Corporation | | Oil Operator | Dec 1986 |
| 4944 | Wilcox Energy Company | | Oil & Gas Operator | Dec 2025 |
| 4945 | Wilcox Operating Company | | Oil Operator | Dec 1989 |
| 4946 | Wilcox Operating Corporation | Shreveport, LA 71115 | Oil & Gas Operator | Sep 2026 |
| 4947 | Wildcat Equipment Co. Inc. | | Oil Operator | Dec 1987 |
| 4948 | Wildcat Midstream Caddo LLC | | Oil Operator | May 2017 |
| 4949 | Wildcat Well Services, LTD. | | Oil Operator | Oct 1989 |
| 4950 | Wildhorse Resources Management Co, LLC | | Oil & Gas Operator | Feb 2018 |
| 4951 | Wildhorse Resources, LLC | Houston, TX 77279 | Oil & Gas Operator | Feb 2015 |
| 4952 | Wilkerson Oil Company | | Oil Operator | Dec 1991 |
| 4953 | Will Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2026 |
| 4954 | Will Haristy, Jr. | | Oil & Gas Operator | Nov 2024 |
| 4955 | Will-Drill Operating, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | Sep 2026 |
| 4956 | Will-Drill Production Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Sep 2026 |
| 4957 | William D. Pittman | | Oil & Gas Operator | Jun 1991 |
| 4958 | William F. Powell | | Oil & Gas Operator | Jun 1979 |
| 4959 | William Lagnion | | Oil & Gas Operator | Aug 1998 |
| 4960 | William M. Williams | | Oil Operator | May 2018 |
| 4961 | William Marvin Hobbs, SR. | | Oil Operator | Aug 2002 |
| 4962 | Williams Exploration Company | | Oil & Gas Operator | Dec 1986 |
| 4963 | Williams Pressure Service Co. | | Oil Operator | Sep 1985 |
| 4964 | Williams-Cody, Inc. | Houston, TX 77060 | Oil & Gas Operator | May 1994 |
| 4965 | Williams-Robinson | | Oil Operator | Mar 1988 |
| 4966 | Williamson & Smitherman | | Oil & Gas Operator | Dec 2008 |
| 4967 | Williamson Oil & Gas, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Dec 2024 |
| 4968 | Williamson Pumping Ser., Inc. | | Oil Operator | Nov 2024 |
| 4969 | Willow Springs Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 1999 |
| 4970 | Wilson Production Co Of La,Inc | | Oil & Gas Operator | Apr 1991 |
| 4971 | Wilson Well Service | Loco, OK 73442-0114 | Oil & Gas Operator | Mar 2018 |
| 4972 | Win Oil Company | Russell, KS 67665 | Oil & Gas Operator | Jul 2021 |
| 4973 | Winbeau Oil & Gas Co. | | Oil & Gas Operator | Oct 2013 |
| 4974 | Winchester Energy Operating Co. | Austin, TX 78746 | Oil & Gas Operator | Sep 2026 |
| 4975 | Winchester Production Company | Shreveport, LA 71129 | Oil & Gas Operator | Nov 2008 |
| 4976 | Windfohr Oil Company | | Oil & Gas Operator | May 1980 |
| 4977 | Windham Oil Company | | Oil & Gas Operator | Dec 1987 |
| 4978 | Windham Oil Corp. | | Oil & Gas Operator | Dec 2024 |
| 4979 | Windrush Operating Co., L.L.C. | Longville, LA 70652 | Oil & Gas Operator | Sep 2026 |
| 4980 | Windrush Operating Company | | Oil & Gas Operator | Jan 2009 |
| 4981 | Windsor Gas Corporation | | Oil & Gas Operator | Aug 1989 |
| 4982 | Wintershall Corporation | | Oil & Gas Operator | Oct 1989 |
| 4983 | Wintershall Oil & Gas Co | | Oil & Gas Operator | Feb 1980 |
| 4984 | Wintershall Oil & Gas Corp | Houston, TX 77027 | Oil & Gas Operator | Jul 1989 |
| 4985 | Winwell, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2007 |
| 4986 | Wisenbaker Production Company | Tyler, TX 75702 | Oil & Gas Operator | Oct 2011 |
| 4987 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 4988 | Witt Oil Production, Inc. | | Oil & Gas Operator | Nov 1984 |
| 4989 | Wle, Inc. | | Oil & Gas Operator | Feb 2012 |
| 4990 | WLS Corporation | | Oil Operator | Aug 2009 |
| 4991 | WM B Hill Production Co | | Oil Operator | Jun 1991 |
| 4992 | WM. H. Kenny Consultants, LTD. | | Oil & Gas Operator | Nov 1991 |
| 4993 | WM. Herbert Hunt TR.Est. | | Oil & Gas Operator | Oct 1992 |
| 4994 | WM. Inabnet | | Gas Operator | Nov 2024 |
| 4995 | WM. T. Burton Industries, Inc. | | Oil & Gas Operator | Apr 1988 |
| 4996 | WM. Zuhone, Jr. | | Oil & Gas Operator | Aug 1988 |
| 4997 | WNR Enterprises', Inc. | | Oil & Gas Operator | Feb 1997 |
| 4998 | Woco La, LLC | | Oil Operator | Jan 2025 |
| 4999 | Wolfe Oil | Bremen, OH 43107 | Oil Operator | Dec 2025 |
| 5000 | Wolverine Exploration Company | Houston, TX 77002 | Oil & Gas Operator | May 2019 |