| 801 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |
| 802 | SWS Operating LLC | Lawton, OK 73501-3236 | Oil Operator | Sep 2024 |
| 803 | Sydson D'Oro Exploration Co. | Houston, TX 77079 | Oil & Gas Operator | Jan 1992 |
| 804 | T C Craighead & Company LLC | Ardmore, OK 73401 | Oil & Gas Operator | Aug 2019 |
| 805 | Tack Operating LLC | Oklahoma City, OK 73172-1492 | Oil & Gas Operator | Aug 2021 |
| 806 | Tag Oil Co LLC | Ringling, OK 73456 | Oil & Gas Operator | Sep 2025 |
| 807 | Tahoe Exploration Inc. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2016 |
| 808 | Tapoil Inc | Elmore City, OK 73433-9077 | Oil & Gas Operator | Jul 2021 |
| 809 | Targa Pipeline Mid-Continent LLC | Sulphur, LA 70665 | Oil & Gas Operator | Jun 2018 |
| 810 | Tbi Exploration Inc | Englewood, CO 801556525 | Oil & Gas Operator | Jun 2011 |
| 811 | TD Oil & Gas LLC | Duncan, OK 73533-1851 | Oil Operator | Apr 2023 |
| 812 | TD Operating Inc | Hinton, OK 73047 | Oil & Gas Operator | Nov 2025 |
| 813 | Te-Ray Energy Inc | Oklahoma City, OK 73108 | Oil & Gas Operator | Oct 2025 |
| 814 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2025 |
| 815 | Technical Energy Services, Inc. | Norman, OK 73070 | Oil & Gas Operator | Oct 2025 |
| 816 | Ten Grand Energy Company Inc | Nachogdoches, TX 75963-1880 | Oil Operator | Mar 2011 |
| 817 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Oct 2025 |
| 818 | Teocalli Exploration LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Nov 2025 |
| 819 | Terra Production Company | Okemah, OK 74859-5924 | Oil & Gas Operator | Apr 2020 |
| 820 | Territory Resources LLC | Stillwater, OK 74074-1869 | Oil & Gas Operator | Nov 2025 |
| 821 | Tex-Star Production | Dallas, TX 75206 | Oil & Gas Operator | Nov 2025 |
| 822 | Texaco Exploration & Prod Inc | Houston, TX 77236 | Oil & Gas Operator | Sep 2025 |
| 823 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 824 | Texaco Oils Inc | Tulsa, OK 74102-2420 | Oil & Gas Operator | Jan 2003 |
| 825 | Texas Meridian Operating Co. Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 1993 |
| 826 | The Quintin Little Company Inc | Ardmore, OK 73401 | Oil & Gas Operator | Nov 2025 |
| 827 | The Twenty Eleven Corp Inc | Ada, OK 74820-3605 | Oil Operator | Oct 2025 |
| 828 | Thomas Exploration Company | Tulsa, OK 74136-6302 | Oil & Gas Operator | Oct 2025 |
| 829 | Thomas Oil Company LLC | Ardmore, OK 73401-3717 | Oil Operator | Oct 2025 |
| 830 | Thunder Oil & Gas, LLC | Ardmore, OK 73402 | Oil & Gas Operator | Nov 2025 |
| 831 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 832 | Tilley Oil Inc | Velma, OK 73491 | Oil & Gas Operator | Nov 2025 |
| 833 | Titan Resources LTD | Limaville, OH 44640 | Oil & Gas Operator | Nov 2025 |
| 834 | TJ Oil Company | Borger, TX 79008 | Oil & Gas Operator | Dec 2025 |
| 835 | TLC Oil And Gas | Duncan, OK 73533-9477 | Oil & Gas Operator | Oct 2015 |
| 836 | TLS Oil & Gas Inc | Kingfisher, OK 73750-0901 | Oil & Gas Operator | Oct 2025 |
| 837 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2025 |
| 838 | Tomar Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Mar 2001 |
| 839 | Tomlinson W E | Comanche, OK 73529-9561 | Oil Operator | Aug 1996 |
| 840 | Tony'S Disposal Service Inc | Yale, OK 74085 | Oil Operator | Aug 1997 |
| 841 | Totah Production | Duncan, OK 73533-9406 | Oil Operator | Mar 2015 |
| 842 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 843 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Dec 2025 |
| 844 | Tri Production Inc | Healdton, OK 73438 | Oil & Gas Operator | Oct 2025 |
| 845 | Triangle Interprises Inc | Justin, TX 76247-0598 | Oil & Gas Operator | Jun 2015 |
| 846 | Tripower Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2020 |
| 847 | Troy Energy Operating LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 2025 |
| 848 | Turner Randall L | Duncan, OK 73533-4826 | Oil Operator | Oct 2025 |
| 849 | Twenty/Twenty Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2025 |
| 850 | Twilight Energy LLC | Fort Worth, TX 76185 | Oil & Gas Operator | Dec 2025 |
| 851 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 852 | Txok Energy Resources Company | Tulsa, OK 74172-0140 | Oil & Gas Operator | Feb 2017 |
| 853 | Tytan Operating Company LLC | Edmond, OK 73083-3794 | Oil & Gas Operator | May 2016 |
| 854 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 855 | Unbridled Resources, LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 856 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 857 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2025 |
| 858 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Dec 2025 |
| 859 | Vancol Oil Co Inc | Ponca City, OK 74602-0030 | Oil & Gas Operator | May 2018 |
| 860 | Vastar Resources Inc | Houston, TX 77253 | Oil & Gas Operator | Sep 2025 |
| 861 | Veenker Resources Inc | Oklahoma City, OK 73113 | Oil & Gas Operator | Nov 2025 |
| 862 | Vi-Roi Oil Company | Duncan, OK 73533 | Oil & Gas Operator | Jun 2004 |
| 863 | Vi-Roi Oil Company LLC | Duncan, OK 73534-1624 | Oil Operator | Aug 1997 |
| 864 | Vi-Roi Oil Income & Dev Prog | Duncan, OK 73533 | Oil Operator | Oct 1994 |
| 865 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 866 | Vitol Inc. | Houston, TX 77098 | Oil & Gas Operator | Sep 2023 |
| 867 | Vitruvian II Woodford LLC | The Woodlands, TX 77381-5259 | Oil & Gas Operator | May 2019 |
| 868 | Walker Corporation (The) | Oklahoma City, OK 73156 | Oil & Gas Operator | May 2006 |
| 869 | Walker Keith F | Ardmore, OK 73401 | Oil & Gas Operator | Jan 2019 |
| 870 | Walker Paul | Duncan, OK 73533-9782 | Oil & Gas Operator | Feb 2022 |
| 871 | Walling, Buster H | | Oil Operator | Jul 2022 |
| 872 | Walsh Jr F Howard | Fort Worth, TX 76102-4773 | Oil & Gas Operator | Sep 2025 |
| 873 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Oct 2025 |
| 874 | Warwick-Jupiter LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Oct 2025 |
| 875 | Washita Energy Inc | Pauls Valley, OK 73075-0923 | Oil & Gas Operator | Mar 2015 |
| 876 | Watertech Disposal | Enid, OK 73702-0125 | Oil Operator | Sep 2007 |
| 877 | Weatherly Oil & Gas, LLC | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 878 | Webber Wesley | Davis, OK 73030 | Oil & Gas Operator | Oct 2009 |
| 879 | Western Oil And Gas Development Corp | Oklahoma City, OK 73103-3735 | Oil & Gas Operator | Oct 2025 |
| 880 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Nov 2025 |
| 881 | Wetzel Producing Company | Duncan, OK 73533-4602 | Oil & Gas Operator | Nov 2025 |
| 882 | Whitco Operating Company | Duncan, OK 73534-1936 | Oil & Gas Operator | Oct 2009 |
| 883 | White Goat Resources LLC | Yukon, OK 73099 | Oil & Gas Operator | Nov 2025 |
| 884 | White Oak Production Company | Conway, AR 72034 | Oil & Gas Operator | Sep 2005 |
| 885 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 886 | Wible Limited Liability Co | Edmond, OK 73012 | Oil Operator | Oct 2024 |
| 887 | Wil-MC Oil Corporation The | Irving, TX 75015-2510 | Oil & Gas Operator | Mar 1999 |
| 888 | Wild Outdoors Oil LLC | Duncan, OK 73533 | Oil & Gas Operator | Nov 2025 |
| 889 | Wildhorse Oil & Gas Corporation | Ardmore, OK 73402 | Oil & Gas Operator | May 2019 |
| 890 | Wildhorse Operating Company | Ardmore, OK 73402 | Oil & Gas Operator | Dec 2025 |
| 891 | Wildwood Operating LLC | Hennessey, OK 73742-7711 | Oil & Gas Operator | Nov 2025 |
| 892 | Wilkins L L E & O Company | Shawnee, OK 74801 | Oil & Gas Operator | Aug 2018 |
| 893 | Wilkinson George R | St Augustine, FL 32080-5352 | Oil & Gas Operator | Jun 2011 |
| 894 | Wilkinson Oil & Gas LLC | Duncan, OK 73533-2048 | Oil Operator | Nov 2025 |
| 895 | William Jefferson Turner | Marlow, OK 73055 | Oil & Gas Operator | Apr 2007 |
| 896 | Williams Dale And Dorothy Family Trust | Maud, OK 74854-2011 | Oil & Gas Operator | Oct 2025 |
| 897 | Williams Operating Company LLC | Comanche, OK 73529 | Oil Operator | Nov 2025 |
| 898 | Williams Reid Oil Co | Dallas, TX 75234 | Oil & Gas Operator | Oct 2025 |
| 899 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2025 |
| 900 | Williford Petroleum, L.L.C. | Green CV SPGS, FL 32043 | Oil & Gas Operator | Dec 2025 |