| 901 | Whittier Operating Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2007 |
| 902 | Whittington Curtis | Stonewall, OK 74871-0482 | Oil & Gas Operator | Feb 2011 |
| 903 | Whittington Energy Co. | Melbourne, FL 32901 | Oil & Gas Operator | Jun 2025 |
| 904 | Whittington Operating Company | Houston, TX 77069 | Oil & Gas Operator | Jun 2025 |
| 905 | Whittington, G. R. | Amarillo, TX 79109 | Oil & Gas Operator | Jan 1994 |
| 906 | Whittington, G. R. Estate | Amarillo, TX 79109 | Oil & Gas Operator | Mar 2008 |
| 907 | Whittington, James C., Inc. | Dallas, TX 75214 | Oil & Gas Operator | Jan 2017 |
| 908 | Whitton Company, Inc. | | Oil & Gas Operator | Jul 2020 |
| 909 | WHK, Inc. | | Oil & Gas Operator | Oct 1993 |
| 910 | WHL Oil Corp. | Houston, TX 77227 | Oil & Gas Operator | Sep 1998 |
| 911 | Whomble O O | Morris, OK 74445 | Oil Operator | Jun 2021 |
| 912 | WHR Corporation | | Oil & Gas Operator | Jul 2014 |
| 913 | Wible Limited Liability Co | Edmond, OK 73012 | Oil Operator | Oct 2024 |
| 914 | Wichita Falls Oil Expl. Co. | Holliday, TX 76366 | Oil & Gas Operator | Jun 2025 |
| 915 | Wichita Industri | | Oil Operator | Nov 1987 |
| 916 | Wichita Operating Company, Inc. | Spring, TX 77393 | Oil & Gas Operator | May 2009 |
| 917 | Wichita River Oil Corporation | Englewood, CO 80111 | Oil & Gas Operator | Apr 2009 |
| 918 | Wick'S Petroleum | | Oil Operator | Aug 1983 |
| 919 | Wicker Oil Co | | Oil & Gas Operator | Feb 1992 |
| 920 | Wicker, La. Cent. & Clovelly | | Gas Operator | Jul 1983 |
| 921 | Wickham, R. R. | | Oil Operator | Jan 1980 |
| 922 | Wicklund Enterprises Inc | | Oil Operator | Dec 2024 |
| 923 | Wicklund Petroleum Corporation | Naples, FL 34108-0108 | Oil & Gas Operator | Dec 2019 |
| 924 | Widener, A.C. Farms, Inc. | Hudson, KS 67545 | Oil Operator | Dec 2009 |
| 925 | Widrig Donald N | | Oil Operator | May 1988 |
| 926 | Widrig Oil LLC | Leawood, KS 66209 | Oil Operator | Feb 2025 |
| 927 | Widrig, Don | Leawood, KS 66209 | Oil Operator | Jul 2008 |
| 928 | Wieck Oil Company LLC | Cromwell, OK 74859 | Oil Operator | Aug 2014 |
| 929 | Wiedemann K T TR | | Oil Operator | Jul 1992 |
| 930 | Wiepking-Fullerton Energy LLC | | Oil & Gas Operator | Mar 2025 |
| 931 | Wieser Oil LLC | | Oil & Gas Operator | Dec 2024 |
| 932 | Wiesner, Roman L. | Ellis, KS 67637 | Oil Operator | Dec 1993 |
| 933 | Wiesner, Tom Oil Operations | Hays, KS 67601 | Gas Operator | Feb 2025 |
| 934 | Wigington, James Robert | Ackerly, TX 79713 | Oil & Gas Operator | Aug 2003 |
| 935 | Wigner, David H Jr | Franklin, KY 42134 | Oil Operator | Dec 2023 |
| 936 | Wikel, David W | | Oil Operator | Jan 2025 |
| 937 | Wil-Mar Operations | Duncan, OK 73534-1566 | Oil & Gas Operator | Oct 2016 |
| 938 | Wil-Max Co. | Kingman, KS 67068 | Oil Operator | Jul 2001 |
| 939 | Wil-MC Oil Corporation The | Irving, TX 75015-2510 | Oil & Gas Operator | Mar 1999 |
| 940 | Wil-Ron Inc | Lucien, OK 73757-9710 | Oil & Gas Operator | Feb 2025 |
| 941 | Wilbanks Energy Corporation | Houston, TX 77036 | Oil & Gas Operator | Dec 2001 |
| 942 | Wilbanks Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 943 | Wilbanks Reserve Corporation | Denver, CO 80203 | Oil & Gas Operator | Jun 2025 |
| 944 | Wilbanks, Bruce & G.L. | Midland, TX 79702 | Oil & Gas Operator | Aug 1996 |
| 945 | Wilbanks, Bruce A. | Midland, TX 79701 | Oil & Gas Operator | Aug 1996 |
| 946 | Wilbanks, Bruce A. Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 947 | Wilbrook Exploration, Inc. | Lingleville, TX 76461 | Oil & Gas Operator | Aug 2003 |
| 948 | Wilburn Wolfe L | Erie, PA 16506-5039 | Gas Operator | Dec 2000 |
| 949 | Wilchar, DR. R. B. | Fort Worth, TX 76185 | Oil & Gas Operator | Jan 2007 |
| 950 | Wilco Oil & Gas Corporation | Oklahoma City, OK 73159-6229 | Oil & Gas Operator | Dec 2023 |
| 951 | Wilco Oil Gas & Expl. Corp. | | Oil & Gas Operator | Mar 1979 |
| 952 | Wilco Operating | Monahans, TX 79756 | Oil & Gas Operator | Jun 2025 |
| 953 | Wilco Properties, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Jan 2004 |
| 954 | Wilco-Placentia Oil Operator LLC | | Oil & Gas Operator | Apr 2025 |
| 955 | Wilcobill Corporation | | Oil Operator | Dec 1986 |
| 956 | Wilcox Energy Company | | Oil & Gas Operator | Mar 2025 |
| 957 | Wilcox Energy Company LLC | Rule, TX 79547 | Oil & Gas Operator | Jun 2025 |
| 958 | Wilcox Oil Company | Rule, TX 79547 | Oil & Gas Operator | Aug 2008 |
| 959 | Wilcox Oil, LLC | Wichita, KS 67235 | Oil Operator | Dec 2019 |
| 960 | Wilcox Operating Company | | Oil Operator | Dec 1989 |
| 961 | Wilcox Operating Corporation | Shreveport, LA 71115 | Oil & Gas Operator | Jun 2025 |
| 962 | Wilcox Petroleum Operating LLC. | Rule, TX 79547 | Oil & Gas Operator | Jun 2025 |
| 963 | Wilcox Pipe & Supply Co | Oklahoma City, OK 73189 | Oil & Gas Operator | May 2006 |
| 964 | Wilcox Ventures, LLC | | Oil & Gas Operator | Mar 2025 |
| 965 | Wilcoxson Brothers | Terral, OK 73569 | Oil Operator | Mar 2008 |
| 966 | Wild Cat Operating Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 967 | Wild Goose Storage LLC | | Gas Operator | Apr 2025 |
| 968 | Wild Horse Energy | Paducah, TX 79248 | Oil & Gas Operator | Jun 2025 |
| 969 | Wild Outdoors Oil LLC | Duncan, OK 73533 | Oil & Gas Operator | Mar 2025 |
| 970 | Wildcat Cement Co. | Shamrock, TX 79079 | Oil & Gas Operator | May 2015 |
| 971 | Wildcat Energy, Inc. | Sedan, KS 67361 | Oil Operator | Feb 2001 |
| 972 | Wildcat Energy, LLC | Odessa, TX 79768 | Oil & Gas Operator | Jul 2021 |
| 973 | Wildcat Equipment Co. Inc. | | Oil Operator | Dec 1987 |
| 974 | Wildcat Exploration, LLC | Glasgow, KY 42141 | Oil Operator | Dec 2023 |
| 975 | Wildcat Midstream Caddo LLC | | Oil Operator | May 2017 |
| 976 | Wildcat Oil & Gas LLC | Seneca, KS 66538 | Oil & Gas Operator | Feb 2025 |
| 977 | Wildcat Oil, LLC | Sebree, KY 42455 | Oil Operator | Dec 2021 |
| 978 | Wildcat Resc Inc | | Oil & Gas Operator | Nov 1992 |
| 979 | Wildcat Resources | | Oil & Gas Operator | Jun 2016 |
| 980 | Wildcat Well Services, LTD. | | Oil Operator | Oct 1989 |
| 981 | Wildco Resources, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Jun 2025 |
| 982 | Wilde, Henry & Janet | Union Springs, NY 13160 | Gas Operator | Dec 2023 |
| 983 | Wildfire Energy Operating LLC | Houston, TX 77224 | Oil & Gas Operator | Jun 2025 |
| 984 | Wildfire Oil & Gas, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2014 |
| 985 | Wildfire Partners Inc | Ardmore, OK 73402 | Oil & Gas Operator | Dec 2009 |
| 986 | Wildhorse Oil | Bogue, KS 67625 | Oil Operator | Oct 1994 |
| 987 | Wildhorse Oil & Gas Corporation | Ardmore, OK 73402 | Oil & Gas Operator | May 2019 |
| 988 | Wildhorse Operating Company | Ardmore, OK 73402 | Oil & Gas Operator | Jun 2025 |
| 989 | Wildhorse Resources Management Co, LLC | | Oil & Gas Operator | Feb 2018 |
| 990 | Wildhorse Resources MNGT Co, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2019 |
| 991 | Wildhorse Resources, LLC | Houston, TX 77279 | Oil & Gas Operator | Feb 2015 |
| 992 | Wildrose Resources Corp | Englewood, CO 80110-6007 | Oil & Gas Operator | Mar 2004 |
| 993 | Wildwood Operating LLC | Hennessey, OK 73742-7711 | Oil & Gas Operator | Feb 2025 |
| 994 | Wiley Lease Co., LTD. | Jourdanton, TX 78026 | Oil Operator | Jun 2025 |
| 995 | Wilham Investments, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Jan 2020 |
| 996 | Wilhelm, Robert V | Russellville, KY 42276 | Gas Operator | Dec 2023 |
| 997 | Wilhite Productions | MC Dade, TX 78650 | Oil & Gas Operator | Oct 2012 |
| 998 | Wilkerson Oil Company | | Oil Operator | Dec 1991 |
| 999 | Wilkes Energy Inc | Akron, OH 44308 | Oil & Gas Operator | Dec 2022 |
| 1000 | Wilkins L L E & O Company | Shawnee, OK 74801 | Oil & Gas Operator | Aug 2018 |