| 1001 | William Herbert Hunt | | Oil & Gas Operator | Mar 1986 |
| 1002 | William Jefferson Turner | Marlow, OK 73055 | Oil & Gas Operator | Apr 2007 |
| 1003 | William K. Barker & Associates | | Oil & Gas Operator | Dec 1986 |
| 1004 | William L Horner Energy | Oliveburg, PA 15764-8411 | Gas Operator | Dec 2014 |
| 1005 | William Lagnion | | Oil & Gas Operator | Aug 1998 |
| 1006 | William M Mauersberg | Sigel, PA 15860-2402 | Oil & Gas Operator | Dec 2009 |
| 1007 | William M. Williams | | Oil Operator | May 2018 |
| 1008 | William Marvin Hobbs, SR. | | Oil Operator | Aug 2002 |
| 1009 | William McIntire Coal Oil & Gas | Shelocta, PA 15774-0171 | Oil & Gas Operator | May 2022 |
| 1010 | William S Miller Inc | Hanoverton, OH 44423 | Oil & Gas Operator | Dec 2025 |
| 1011 | William Southwell & Son Oil LLC | Warren, PA 16365 | Oil & Gas Operator | Dec 2025 |
| 1012 | Williams Brothers Engineering Company | Tulsa, OK 74134-5885 | Oil & Gas Operator | May 2013 |
| 1013 | Williams Dale | Konawa, OK 74849-9211 | Oil Operator | Mar 2026 |
| 1014 | Williams Dale And Dorothy Family Trust | Maud, OK 74854-2011 | Oil & Gas Operator | Feb 2026 |
| 1015 | Williams Deville Operating, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Jun 2026 |
| 1016 | Williams Doyle Dba BCF Gas | Tulsa, OK 74114-7099 | Oil & Gas Operator | Jul 2023 |
| 1017 | Williams Exploration Company | | Oil & Gas Operator | Dec 1986 |
| 1018 | Williams Gas Pipeline Central, Inc. | Shawnee Mission, KS 66215 | Oil Operator | Sep 2010 |
| 1019 | Williams Inc | | Oil Operator | Dec 2019 |
| 1020 | Williams Jack W | Ardmore, OK 73401-4726 | Oil Operator | Feb 2017 |
| 1021 | Williams Kidd Drilling Corp | Claremore, OK 74017-0846 | Oil Operator | Jun 2013 |
| 1022 | Williams M H | Red Rock, OK 74651-0311 | Oil & Gas Operator | Jun 2023 |
| 1023 | Williams Oil Company | Midland, TX 79710 | Oil & Gas Operator | Jun 2026 |
| 1024 | Williams Operating Company LLC | Comanche, OK 73529 | Oil Operator | Mar 2026 |
| 1025 | Williams Petroleum Company, Inc. | Burkburnett, TX 76354 | Oil & Gas Operator | Jun 2026 |
| 1026 | Williams Pressure Service Co. | | Oil Operator | Sep 1985 |
| 1027 | Williams Prod. Gulf Coast, L.P. | Benbrook, TX 76126 | Oil & Gas Operator | Jan 2012 |
| 1028 | Williams Producing Co | | Oil & Gas Operator | Mar 2026 |
| 1029 | Williams Production RMT Company | Denver, CO 80202 | Oil & Gas Operator | Oct 2010 |
| 1030 | Williams Refractories Inc | Cushing, OK 74023 | Oil & Gas Operator | Feb 2015 |
| 1031 | Williams Reid Oil Co | Dallas, TX 75234 | Oil & Gas Operator | Feb 2026 |
| 1032 | Williams Robert | | Oil & Gas Operator | Apr 1995 |
| 1033 | Williams Roger F | Tulsa, OK 74152-0951 | Oil & Gas Operator | May 2013 |
| 1034 | Williams Royce S | Healdton, OK 73438-0306 | Oil & Gas Operator | Apr 2014 |
| 1035 | Williams Ted H | | Oil & Gas Operator | Dec 2008 |
| 1036 | Williams Well Surveys Inc. | | Oil & Gas Operator | Dec 1996 |
| 1037 | Williams, A. Oil | Wichita Falls, TX 76308 | Oil Operator | Jun 2026 |
| 1038 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Jun 2026 |
| 1039 | Williams, Clayton Energy, L.L.C | Midland, TX 79705 | Oil & Gas Operator | May 1993 |
| 1040 | Williams, Clayton W., Jr. | | Oil & Gas Operator | Jun 1989 |
| 1041 | Williams, Clayton W., Jr., Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 1042 | Williams, Cynthia L. | Fredonia, NY 14063 | Gas Operator | Dec 2024 |
| 1043 | Williams, Donald M. | Eden, NY 14057 | Gas Operator | Dec 2024 |
| 1044 | Williams, Doyle | | Oil & Gas Operator | Feb 2026 |
| 1045 | Williams, E. L. | Emporia, KS 66801 | Oil & Gas Operator | Nov 1988 |
| 1046 | Williams, Floyd E | | Oil Operator | Dec 2015 |
| 1047 | Williams, H. E. | Houston, TX 77002 | Oil & Gas Operator | Dec 1994 |
| 1048 | Williams, John E | Scottsville, KY 42164 | Oil Operator | Dec 2015 |
| 1049 | Williams, Kenneth O. Jr | | Oil Operator | Nov 2006 |
| 1050 | Williams, Paul H. | Plainville, KS 67663 | Oil Operator | Mar 1987 |
| 1051 | Williams, Paul M. And/Or Judy A. | Leroy, KS 66857 | Oil Operator | Nov 2018 |
| 1052 | Williams, Raymond H.(Deceased) | Sedan, KS 67361 | Oil Operator | Nov 2009 |
| 1053 | Williams, Robert J. | Independence, KS 67301 | Oil Operator | May 2019 |
| 1054 | Williams, W. R. | Amarillo, TX 79105 | Oil & Gas Operator | Jun 2013 |
| 1055 | Williams, W. R., Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Feb 2024 |
| 1056 | Williams-Cody, Inc. | Houston, TX 77060 | Oil & Gas Operator | May 1994 |
| 1057 | Williams-Robinson | | Oil Operator | Mar 1988 |
| 1058 | Williamson & Smitherman | | Oil & Gas Operator | Dec 2008 |
| 1059 | Williamson Gregory L | Skiatook, OK 74070-0028 | Oil & Gas Operator | Mar 2015 |
| 1060 | Williamson Oil & Gas, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Dec 2024 |
| 1061 | Williamson Oil And Gas LLC | Lower Salem, OH 45745 | Oil & Gas Operator | Dec 2025 |
| 1062 | Williamson Operating Co. | Uvalde, TX 78801 | Oil & Gas Operator | Jun 2026 |
| 1063 | Williamson Operating Co., LLC | Stamps, AR 71860 | Oil & Gas Operator | Jun 2026 |
| 1064 | Williamson Ozella | Skiatook, OK 74070 | Oil Operator | Aug 2013 |
| 1065 | Williamson Pumping Ser., Inc. | | Oil Operator | Nov 2024 |
| 1066 | Williamson Pumping Service, Inc | Stamps, AR 71860 | Oil & Gas Operator | Jan 2025 |
| 1067 | Williamson, J. C. | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 1068 | Williamson, Ralph E. | Midland, TX 79702 | Oil & Gas Operator | Jan 2012 |
| 1069 | Williamson, Richard | Camden, AR 71701 | Oil & Gas Operator | Jan 2025 |
| 1070 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2026 |
| 1071 | Williford Petroleum, L.L.C. | Green CV SPGS, FL 32043 | Oil & Gas Operator | Jun 2026 |
| 1072 | Williford Resources LLC | Tulsa, OK 74136-1020 | Oil & Gas Operator | Mar 2026 |
| 1073 | Willis Energy | Neodesha, KS 66757 | Oil & Gas Operator | Dec 2009 |
| 1074 | Willis Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Jun 2026 |
| 1075 | Williston Basin Cosul-Profit SH | | Oil Operator | Dec 1989 |
| 1076 | Williston Hunter ND, LLC | | Oil & Gas Operator | Mar 2014 |
| 1077 | Williston Industrial Supply Corporation | Williston, ND 58801 | Oil & Gas Operator | Mar 2012 |
| 1078 | Willo Oil & Gas Exploration, LLC | Boerne, TX 78006 | Oil & Gas Operator | Jul 2020 |
| 1079 | Willow Bend Oil LLC | Dallas, TX 75206 | Oil & Gas Operator | Jun 2026 |
| 1080 | Willow Creek Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2009 |
| 1081 | Willow Run Corporation | | Oil & Gas Operator | Dec 2021 |
| 1082 | Willow Springs Prod. Serv.,LLC | Kilgore, TX 75663 | Oil & Gas Operator | Aug 1997 |
| 1083 | Willow Springs Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 1999 |
| 1084 | Willowbend Investments, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2026 |
| 1085 | Willowick Production LLC | Houston, TX 77057 | Oil & Gas Operator | Jun 2026 |
| 1086 | Wills Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1995 |
| 1087 | Wills Oil Holdings, L.L.C. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2026 |
| 1088 | Willstar Energy GP, LLC | Houston, TX 77279 | Oil & Gas Operator | Sep 2013 |
| 1089 | Wilmoth Clark Exploration & Prod LLC | Glen Campbell, PA 15742-0159 | Gas Operator | Dec 2008 |
| 1090 | Wilmoth Interests, Inc. | Marion Center, PA 15759 | Oil & Gas Operator | Dec 2025 |
| 1091 | Wilshire Enterprises Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 1092 | Wilshire Oil Co. Of Texas | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2004 |
| 1093 | Wilshire Oil LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2026 |
| 1094 | Wilson - Owens Production Co. | Longview, TX 75601 | Oil & Gas Operator | Nov 1998 |
| 1095 | Wilson Allen Dewayne | Okemah, OK 74859 | Oil & Gas Operator | Feb 2026 |
| 1096 | Wilson Brothers Leasing Co., Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2015 |
| 1097 | Wilson Charles B | | Oil & Gas Operator | Dec 1996 |
| 1098 | Wilson Charles R | Durant, OK 74701 | Oil Operator | Jan 2026 |
| 1099 | Wilson Claude | Loco, OK 73442-9404 | Oil & Gas Operator | Feb 2026 |
| 1100 | Wilson County Holdings LLC | Golden, CO 80403 | Oil Operator | Feb 2026 |