| 5001 | Whitton Company, Inc. | | Oil & Gas Operator | Jul 2020 |
| 5002 | WHK, Inc. | | Oil & Gas Operator | Oct 1993 |
| 5003 | Wichita River Oil Corporation | Englewood, CO 80111 | Oil & Gas Operator | Apr 2009 |
| 5004 | Wicker Oil Co | | Oil & Gas Operator | Feb 1992 |
| 5005 | Wicker, La. Cent. & Clovelly | | Gas Operator | Jul 1983 |
| 5006 | Wilco Oil Gas & Expl. Corp. | | Oil & Gas Operator | Mar 1979 |
| 5007 | Wilcobill Corporation | | Oil Operator | Dec 1986 |
| 5008 | Wilcox Energy Company | | Oil & Gas Operator | Mar 2025 |
| 5009 | Wilcox Operating Company | | Oil Operator | Dec 1989 |
| 5010 | Wilcox Operating Corporation | Shreveport, LA 71115 | Oil & Gas Operator | May 2025 |
| 5011 | Wildcat Equipment Co. Inc. | | Oil Operator | Dec 1987 |
| 5012 | Wildcat Midstream Caddo LLC | | Oil Operator | May 2017 |
| 5013 | Wildcat Well Services, LTD. | | Oil Operator | Oct 1989 |
| 5014 | Wildhorse Resources Management Co, LLC | | Oil & Gas Operator | Feb 2018 |
| 5015 | Wildhorse Resources, LLC | Houston, TX 77279 | Oil & Gas Operator | Feb 2015 |
| 5016 | Wilkerson Oil Company | | Oil Operator | Dec 1991 |
| 5017 | Will Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2025 |
| 5018 | Will Haristy, Jr. | | Oil & Gas Operator | Nov 2024 |
| 5019 | Will-Drill Operating, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | May 2025 |
| 5020 | Will-Drill Production Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | May 2025 |
| 5021 | William D. Pittman | | Oil & Gas Operator | Jun 1991 |
| 5022 | William F. Powell | | Oil & Gas Operator | Jun 1979 |
| 5023 | William Lagnion | | Oil & Gas Operator | Aug 1998 |
| 5024 | William M. Williams | | Oil Operator | May 2018 |
| 5025 | William Marvin Hobbs, SR. | | Oil Operator | Aug 2002 |
| 5026 | Williams Exploration Company | | Oil & Gas Operator | Dec 1986 |
| 5027 | Williams Pressure Service Co. | | Oil Operator | Sep 1985 |
| 5028 | Williams-Cody, Inc. | Houston, TX 77060 | Oil & Gas Operator | May 1994 |
| 5029 | Williams-Robinson | | Oil Operator | Mar 1988 |
| 5030 | Williamson & Smitherman | | Oil & Gas Operator | Dec 2008 |
| 5031 | Williamson Oil & Gas, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Dec 2024 |
| 5032 | Williamson Pumping Ser., Inc. | | Oil Operator | Nov 2024 |
| 5033 | Willow Springs Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 1999 |
| 5034 | Wilson Production Co Of La,Inc | | Oil & Gas Operator | Apr 1991 |
| 5035 | Wilson Well Service | Loco, OK 73442-0114 | Oil & Gas Operator | Mar 2018 |
| 5036 | Win Oil Company | Russell, KS 67665 | Oil & Gas Operator | Jul 2021 |
| 5037 | Winbeau Oil & Gas Co. | | Oil & Gas Operator | Oct 2013 |
| 5038 | Winchester Energy Operating Co. | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 5039 | Winchester Production Company | Shreveport, LA 71129 | Oil & Gas Operator | Nov 2008 |
| 5040 | Windfohr Oil Company | | Oil & Gas Operator | May 1980 |
| 5041 | Windham Oil Company | | Oil & Gas Operator | Dec 1987 |
| 5042 | Windham Oil Corp. | | Oil & Gas Operator | Dec 2024 |
| 5043 | Windrush Operating Co., L.L.C. | Longville, LA 70652 | Oil & Gas Operator | May 2025 |
| 5044 | Windrush Operating Company | | Oil & Gas Operator | Jan 2009 |
| 5045 | Windsor Gas Corporation | | Oil & Gas Operator | Aug 1989 |
| 5046 | Wintershall Corporation | | Oil & Gas Operator | Oct 1989 |
| 5047 | Wintershall Oil & Gas Co | | Oil & Gas Operator | Feb 1980 |
| 5048 | Wintershall Oil & Gas Corp | Houston, TX 77027 | Oil & Gas Operator | Jul 1989 |
| 5049 | Winwell, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2007 |
| 5050 | Wisenbaker Production Company | Tyler, TX 75702 | Oil & Gas Operator | Oct 2011 |
| 5051 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 5052 | Witt Oil Production, Inc. | | Oil & Gas Operator | Nov 1984 |
| 5053 | Wle, Inc. | | Oil & Gas Operator | Feb 2012 |
| 5054 | WLS Corporation | | Oil Operator | Aug 2009 |
| 5055 | WM B Hill Production Co | | Oil Operator | Jun 1991 |
| 5056 | WM. H. Kenny Consultants, LTD. | | Oil & Gas Operator | Nov 1991 |
| 5057 | WM. Herbert Hunt TR.Est. | | Oil & Gas Operator | Oct 1992 |
| 5058 | WM. Inabnet | | Gas Operator | Nov 2024 |
| 5059 | WM. T. Burton Industries, Inc. | | Oil & Gas Operator | Apr 1988 |
| 5060 | WM. Zuhone, Jr. | | Oil & Gas Operator | Aug 1988 |
| 5061 | WNR Enterprises', Inc. | | Oil & Gas Operator | Feb 1997 |
| 5062 | Woco La, LLC | | Oil Operator | Jan 2025 |
| 5063 | Wolfe Oil | Bremen, OH 43107 | Oil Operator | Dec 2024 |
| 5064 | Wolverine Exploration Company | Houston, TX 77002 | Oil & Gas Operator | May 2019 |
| 5065 | Womack & Nelson | | Gas Operator | Feb 1987 |
| 5066 | Womack & Price | | Oil & Gas Operator | Oct 1990 |
| 5067 | Womack Prod Co. | | Oil Operator | Feb 1996 |
| 5068 | Wood Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Jun 1999 |
| 5069 | Woodall Oil Company | | Oil Operator | Sep 2010 |
| 5070 | Woodbine Petroleum, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Aug 2003 |
| 5071 | Woodbine Production Corporation | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 5072 | Woodco Oil And Gas Company | | Gas Operator | Nov 1981 |
| 5073 | Woodland Hills Oil & Gas, LLC | | Oil Operator | Dec 2024 |
| 5074 | Woodlawn Energy Dev., L.L.C. | | Oil & Gas Operator | Aug 2006 |
| 5075 | Woodpecker Corp. | | Oil & Gas Operator | Dec 2024 |
| 5076 | Woods & Deas | | Oil & Gas Operator | Jan 1984 |
| 5077 | Woods & Deas-Dobie | | Oil & Gas Operator | Aug 1983 |
| 5078 | Woods Operating Co., Inc. | Shreveport, LA 71136 | Oil & Gas Operator | Dec 2020 |
| 5079 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 5080 | Woods, Et Al | | Gas Operator | Sep 1990 |
| 5081 | Wooldridge Land & Cattle, LLC | | Oil Operator | Jan 2025 |
| 5082 | Wooldridge Production Co.,LTD. | | Oil & Gas Operator | Apr 2008 |
| 5083 | Wooldridge Production, L.L.C. | | Oil Operator | Mar 2005 |
| 5084 | Woolf & Magee, Inc. | | Oil & Gas Operator | Oct 1991 |
| 5085 | Workover One, Inc. | | Oil & Gas Operator | Jul 1989 |
| 5086 | World Oil & Gas Expl., Inc. | | Oil & Gas Operator | Mar 1988 |
| 5087 | World Producers, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1994 |
| 5088 | Worldwide Energy Corp. | Freer, TX 78357 | Oil & Gas Operator | Jan 1997 |
| 5089 | Wright Production Company | | Oil Operator | Jun 1990 |
| 5090 | WRT Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | May 1998 |
| 5091 | WSF, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2013 |
| 5092 | Wylee Petroleum Corporation | | Oil & Gas Operator | Dec 1984 |
| 5093 | Wynn-Crosby Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 5094 | Wynn-Crosby Operating, LTD. | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 5095 | Wytex Production Corporation | Fort Smith, AR 72903 | Oil & Gas Operator | Jan 2020 |
| 5096 | XCL-Louisiana, Inc. | | Oil & Gas Operator | Aug 1993 |
| 5097 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 5098 | Xplor Energy Operating Co. | Houston, TX 77079 | Oil & Gas Operator | Jan 2012 |
| 5099 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 5100 | Xtra Energy Corporation | | Oil & Gas Operator | Jun 1989 |