| 901 | Union Texas Petroleum Corp. | Houston, TX 77252-2120 | Oil & Gas Operator | Dec 2014 |
| 902 | Union Valley Petroleum Corporation | Enid, OK 73701 | Oil & Gas Operator | Jan 2025 |
| 903 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2025 |
| 904 | United Oil Corporation | Denver, CO 80202-3813 | Oil & Gas Operator | Dec 2024 |
| 905 | United Production Company LLC | Edmond, OK 73003 | Oil & Gas Operator | Jan 2025 |
| 906 | Usedc Okc LLC | Getzville, NY 14068-1296 | Oil & Gas Operator | May 2018 |
| 907 | Van Horn Oil & Gas Inc | Tulsa, OK 74170 | Oil & Gas Operator | Nov 1998 |
| 908 | Veenker Resources, Inc. | Oklahoma City, OK 73113 | Oil & Gas Operator | Jan 2025 |
| 909 | Vega Energy Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 2015 |
| 910 | Victory Petroleum Inc | Tulsa, OK 74170-0354 | Oil & Gas Operator | May 2013 |
| 911 | Viersen & Cochran Drilling Company | | Oil & Gas Operator | May 2015 |
| 912 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Dec 2024 |
| 913 | Vitol Inc | Houston, TX 77002 | Oil & Gas Operator | Sep 2023 |
| 914 | Waggoner Oil & Gas Corp | Enid, OK 73703-1152 | Oil & Gas Operator | Jan 2025 |
| 915 | Wagner & Brown | Midland, TX 79702 | Oil & Gas Operator | Aug 2014 |
| 916 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 917 | Walker Keith F | Ardmore, OK 73401 | Oil & Gas Operator | Jan 2019 |
| 918 | Wallace Oil & Gas Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Mar 2025 |
| 919 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Dec 2024 |
| 920 | Warren American Oil Company LLC | Tulsa, OK 74147 | Oil & Gas Operator | Mar 2025 |
| 921 | Warwick Associates LC | Oklahoma City, OK 73112 | Oil & Gas Operator | Jan 2025 |
| 922 | Wehlu Producers Inc | Edmond, OK 73083-5278 | Oil & Gas Operator | Sep 2002 |
| 923 | Welch Family Trust | Ada, OK 74820-9643 | Oil & Gas Operator | Apr 2015 |
| 924 | Wellco Energy Inc | Harrah, OK 73045 | Oil & Gas Operator | Dec 2024 |
| 925 | Wentworth Operating Company | Oklahoma City, OK 73162-1863 | Oil & Gas Operator | Jan 2025 |
| 926 | Western Natl Resource Expl LLC | Oklahoma City, OK 73154-0755 | Oil & Gas Operator | Mar 2015 |
| 927 | Western Natural Resources Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 928 | WFD Oil Corporation | Edmond, OK 73012-0619 | Oil & Gas Operator | Jan 2025 |
| 929 | Wharton Oil Co. | Vernon, TX 76384 | Oil & Gas Operator | Dec 2000 |
| 930 | Wheeler Richard Jr | Oklahoma City, OK 73112-8857 | Oil & Gas Operator | Mar 2005 |
| 931 | White Goat Resources LLC | Yukon, OK 73099 | Oil & Gas Operator | Jan 2025 |
| 932 | White Operating Company | Oklahoma City, OK 73159-7136 | Oil & Gas Operator | Jan 2025 |
| 933 | White Star Petroleum LLC | Oklahoma City, OK 73116-7906 | Oil & Gas Operator | Dec 2024 |
| 934 | White Wilber R Oil Enterprises | | Oil & Gas Operator | May 2006 |
| 935 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 936 | Whitley Oil & Gas Inc | Owasso, OK 74055 | Oil & Gas Operator | Jun 2009 |
| 937 | Wil-MC Oil Corporation The | Irving, TX 75015-2510 | Oil & Gas Operator | Mar 1999 |
| 938 | Wildhorse Oil & Gas Corporation | Ardmore, OK 73402 | Oil & Gas Operator | May 2019 |
| 939 | Wildwood Operating LLC | Hennessey, OK 73742-7711 | Oil & Gas Operator | Dec 2024 |
| 940 | Williams M H | Red Rock, OK 74651-0311 | Oil & Gas Operator | May 2023 |
| 941 | Williams Roger F | Tulsa, OK 74152-0951 | Oil & Gas Operator | May 2013 |
| 942 | Wilshire Enterprises Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 943 | Wind River Exploration Inc | Sewickley, PA 15143 | Oil & Gas Operator | Nov 2024 |
| 944 | Wishbone Oil & Gas | Noble, OK 73068 | Oil & Gas Operator | Mar 2007 |
| 945 | Witty Thomas E | Enid, OK 73703 | Oil & Gas Operator | Mar 2008 |
| 946 | Wood Fay C Estate | Enid, OK 73703 | Oil & Gas Operator | Jun 2013 |
| 947 | Wright Jerry L | Crescent, OK 73028-0474 | Oil & Gas Operator | Jun 2013 |
| 948 | Xae Corporation | Norman, OK 73072 | Oil & Gas Operator | Apr 2021 |
| 949 | Xanadu Exploration Company | Broken Arrow, OK 74014 | Oil & Gas Operator | Jan 2025 |
| 950 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 951 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2025 |
| 952 | Yarhola Production Company | Drumright, OK 74030 | Oil & Gas Operator | Dec 2024 |
| 953 | Zap Oil Company | Nowata, OK 74048-2640 | Oil & Gas Operator | Nov 2005 |
| 954 | Zim Energy Corporation | Tulsa, OK 74153 | Oil & Gas Operator | Jan 1998 |
| 955 | Zollinger Veldon | Cresent, OK 73028 | Oil & Gas Operator | Apr 2009 |
| 956 | Zollinger Veldon Inc | Crescent, OK 73028-9280 | Oil & Gas Operator | Nov 2018 |