| 1001 | Wilkinson Drilli | | Oil Operator | Dec 1991 |
| 1002 | Wilkinson Energy LLC | Dodgeville, WI 53533 | Oil Operator | Jan 2025 |
| 1003 | Wilkinson George R | St Augustine, FL 32080-5352 | Oil & Gas Operator | Jun 2011 |
| 1004 | Wilkinson Oil & Gas LLC | Duncan, OK 73533-2048 | Oil Operator | Feb 2025 |
| 1005 | Wilkison Richard W | Oklahoma City, OK 73107 | Oil Operator | Mar 2011 |
| 1006 | Will Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2025 |
| 1007 | Will Haristy, Jr. | | Oil & Gas Operator | Nov 2024 |
| 1008 | Will McCasland Ind | Hobbs, NM 88240 | Gas Operator | Feb 2008 |
| 1009 | Will-Drill Operating, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | Jun 2025 |
| 1010 | Will-Drill Production Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jun 2025 |
| 1011 | Willa Mae Overman LLC | Ponca City, OK 74601-9451 | Oil & Gas Operator | Aug 2023 |
| 1012 | Willard M Cline | Bradford, PA 16701-1715 | Oil & Gas Operator | Dec 2022 |
| 1013 | Willard Pease Drilling Co | Grand Junction, CO 81501 | Oil & Gas Operator | Dec 1983 |
| 1014 | Willey George | Newark, OH 43058-572-572 | Oil & Gas Operator | Dec 2024 |
| 1015 | William B Renfro LLC | | Oil Operator | Dec 2020 |
| 1016 | William C Bahlburg | Dallas, TX 75240 | Oil & Gas Operator | Dec 1994 |
| 1017 | William D. Pittman | | Oil & Gas Operator | Jun 1991 |
| 1018 | William F. Powell | | Oil & Gas Operator | Jun 1979 |
| 1019 | William Fleming Productions, LLC | Wichita Falls, TX 76305 | Oil Operator | Feb 2025 |
| 1020 | William G Bush | Grand Junction, CO 81506 | Oil & Gas Operator | Jun 2012 |
| 1021 | William G Smith Oil, LLC | Osawatomie, KS 66064 | Oil Operator | Apr 2014 |
| 1022 | William Herbert Hunt | | Oil & Gas Operator | Mar 1986 |
| 1023 | William K. Barker & Associates | | Oil & Gas Operator | Dec 1986 |
| 1024 | William L Horner Energy | Oliveburg, PA 15764-8411 | Gas Operator | Dec 2014 |
| 1025 | William Lagnion | | Oil & Gas Operator | Aug 1998 |
| 1026 | William M Mauersberg | Sigel, PA 15860-2402 | Oil & Gas Operator | Dec 2009 |
| 1027 | William M. Williams | | Oil Operator | May 2018 |
| 1028 | William Marvin Hobbs, SR. | | Oil Operator | Aug 2002 |
| 1029 | William McIntire Coal Oil & Gas | Shelocta, PA 15774-0171 | Oil & Gas Operator | May 2022 |
| 1030 | William S Miller Inc | Hanoverton, OH 44423 | Oil & Gas Operator | Dec 2024 |
| 1031 | William Southwell & Son Oil LLC | Warren, PA 16365 | Oil & Gas Operator | Dec 2024 |
| 1032 | Williams Brothers Engineering Company | Tulsa, OK 74134-5885 | Oil & Gas Operator | May 2013 |
| 1033 | Williams Dale | Konawa, OK 74849-9211 | Oil Operator | Feb 2025 |
| 1034 | Williams Dale And Dorothy Family Trust | Maud, OK 74854-2011 | Oil & Gas Operator | Feb 2025 |
| 1035 | Williams Deville Operating, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Jun 2025 |
| 1036 | Williams Doyle Dba BCF Gas | Tulsa, OK 74114-7099 | Oil & Gas Operator | Jul 2023 |
| 1037 | Williams Exploration Company | | Oil & Gas Operator | Dec 1986 |
| 1038 | Williams Gas Pipeline Central, Inc. | Shawnee Mission, KS 66215 | Oil Operator | Sep 2010 |
| 1039 | Williams Inc | | Oil Operator | Dec 2019 |
| 1040 | Williams Jack W | Ardmore, OK 73401-4726 | Oil Operator | Feb 2017 |
| 1041 | Williams Kidd Drilling Corp | Claremore, OK 74017-0846 | Oil Operator | Jun 2013 |
| 1042 | Williams M H | Red Rock, OK 74651-0311 | Oil & Gas Operator | May 2023 |
| 1043 | Williams Oil Company | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 1044 | Williams Operating Company LLC | Duncan, OK 73533 | Oil Operator | Feb 2025 |
| 1045 | Williams Petroleum Company, Inc. | Burkburnett, TX 76354 | Oil & Gas Operator | Jun 2025 |
| 1046 | Williams Pressure Service Co. | | Oil Operator | Sep 1985 |
| 1047 | Williams Prod. Gulf Coast, L.P. | Benbrook, TX 76126 | Oil & Gas Operator | Jan 2012 |
| 1048 | Williams Producing Co | | Oil & Gas Operator | Mar 2025 |
| 1049 | Williams Production RMT Company | Denver, CO 80202 | Oil & Gas Operator | Oct 2010 |
| 1050 | Williams Refractories Inc | Cushing, OK 74023 | Oil & Gas Operator | Feb 2015 |
| 1051 | Williams Reid Oil Co | Dallas, TX 75234 | Oil & Gas Operator | Feb 2025 |
| 1052 | Williams Robert | | Oil & Gas Operator | Apr 1995 |
| 1053 | Williams Roger F | Tulsa, OK 74152-0951 | Oil & Gas Operator | May 2013 |
| 1054 | Williams Royce S | Healdton, OK 73438-0306 | Oil & Gas Operator | Apr 2014 |
| 1055 | Williams Ted H | | Oil & Gas Operator | Dec 2008 |
| 1056 | Williams Well Surveys Inc. | | Oil & Gas Operator | Dec 1996 |
| 1057 | Williams, A. Oil | Wichita Falls, TX 76308 | Oil Operator | Jun 2025 |
| 1058 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Jun 2025 |
| 1059 | Williams, Clayton Energy, L.L.C | Midland, TX 79705 | Oil & Gas Operator | May 1993 |
| 1060 | Williams, Clayton W., Jr. | | Oil & Gas Operator | Jun 1989 |
| 1061 | Williams, Clayton W., Jr., Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 1062 | Williams, Cynthia L. | Fredonia, NY 14063 | Gas Operator | Dec 2023 |
| 1063 | Williams, Donald M. | Eden, NY 14057 | Gas Operator | Dec 2023 |
| 1064 | Williams, Doyle | | Oil & Gas Operator | Feb 2025 |
| 1065 | Williams, E. L. | Emporia, KS 66801 | Oil & Gas Operator | Nov 1988 |
| 1066 | Williams, Floyd E | | Oil Operator | Dec 2015 |
| 1067 | Williams, H. E. | Houston, TX 77002 | Oil & Gas Operator | Dec 1994 |
| 1068 | Williams, John E | Scottsville, KY 42164 | Oil Operator | Dec 2015 |
| 1069 | Williams, Kenneth O. Jr | | Oil Operator | Nov 2006 |
| 1070 | Williams, Paul H. | Plainville, KS 67663 | Oil Operator | Mar 1987 |
| 1071 | Williams, Paul M. And/Or Judy A. | Leroy, KS 66857 | Oil Operator | Nov 2018 |
| 1072 | Williams, Raymond H.(Deceased) | Sedan, KS 67361 | Oil Operator | Nov 2009 |
| 1073 | Williams, Robert J. | Independence, KS 67301 | Oil Operator | May 2019 |
| 1074 | Williams, W. R. | Amarillo, TX 79105 | Oil & Gas Operator | Jun 2013 |
| 1075 | Williams, W. R., Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Feb 2024 |
| 1076 | Williams-Cody, Inc. | Houston, TX 77060 | Oil & Gas Operator | May 1994 |
| 1077 | Williams-Robinson | | Oil Operator | Mar 1988 |
| 1078 | Williamson & Smitherman | | Oil & Gas Operator | Dec 2008 |
| 1079 | Williamson Gregory L | Skiatook, OK 74070-0028 | Oil & Gas Operator | Mar 2015 |
| 1080 | Williamson Oil & Gas, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Dec 2024 |
| 1081 | Williamson Oil And Gas LLC | Lower Salem, OH 45745 | Oil & Gas Operator | Dec 2024 |
| 1082 | Williamson Operating Co. | Uvalde, TX 78801 | Oil & Gas Operator | Jun 2025 |
| 1083 | Williamson Operating Co., LLC | Stamps, AR 71860 | Oil & Gas Operator | Jun 2025 |
| 1084 | Williamson Ozella | Skiatook, OK 74070 | Oil Operator | Aug 2013 |
| 1085 | Williamson Pumping Ser., Inc. | | Oil Operator | Nov 2024 |
| 1086 | Williamson Pumping Service, Inc | Stamps, AR 71860 | Oil & Gas Operator | Jan 2025 |
| 1087 | Williamson, J. C. | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 1088 | Williamson, Ralph E. | Midland, TX 79702 | Oil & Gas Operator | Jan 2012 |
| 1089 | Williamson, Richard | Camden, AR 71701 | Oil & Gas Operator | Dec 2024 |
| 1090 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2025 |
| 1091 | Williford Petroleum, L.L.C. | Green CV SPGS, FL 32043 | Oil & Gas Operator | Jun 2025 |
| 1092 | Williford Resources, L.L.C. | Tulsa, OK 74136-1020 | Oil & Gas Operator | Mar 2025 |
| 1093 | Willis Energy | Neodesha, KS 66757 | Oil & Gas Operator | Dec 2009 |
| 1094 | Willis Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Jun 2025 |
| 1095 | Williston Basin Cosul-Profit SH | | Oil Operator | Dec 1989 |
| 1096 | Williston Hunter ND, LLC | | Oil & Gas Operator | Mar 2014 |
| 1097 | Williston Industrial Supply Corporation | Williston, ND 58801 | Oil & Gas Operator | Mar 2012 |
| 1098 | Willo Oil & Gas Exploration, LLC | Boerne, TX 78006 | Oil & Gas Operator | Jul 2020 |
| 1099 | Willow Bend Oil LLC | Dallas, TX 75206 | Oil & Gas Operator | Jun 2025 |
| 1100 | Willow Creek Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2009 |