| 801 | Stesco Operating Company LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | May 2025 |
| 802 | Stetson Energy Corporation | Duncan, OK 73534-0098 | Oil & Gas Operator | Mar 2015 |
| 803 | Stewart Inc | Ringling, OK 73456 | Oil & Gas Operator | Jun 2025 |
| 804 | Stewart Morris E Oil Company | Oklahoma City, OK 73132 | Oil & Gas Operator | Jan 2013 |
| 805 | Stewart Morris E Operating Co LLC | Oklahoma City, OK 73172-0600 | Oil & Gas Operator | Jul 2008 |
| 806 | Stone River Energy Corp | Edmond, OK 73034 | Oil & Gas Operator | Jan 2014 |
| 807 | Stoneriver Energy, LLC | Lubbock, TX 79424 | Oil & Gas Operator | Oct 2025 |
| 808 | Stratco, Inc. | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 809 | Stratford Well Service Inc | Pond Creek, OK 73766-0310 | Oil Operator | Nov 2003 |
| 810 | Stream Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 811 | Streamline Oil And Gas Inc | Lindsey, OK 73052 | Oil & Gas Operator | Jul 2025 |
| 812 | Stroud Petroleum Company | Oklahoma City, OK 73156-0156 | Oil Operator | Jun 2014 |
| 813 | Struthers Oil & Gas Corp | Tulsa, OK 74133 | Oil & Gas Operator | Jan 2013 |
| 814 | Sullivan Jesse G | Duncan, OK 73533 | Oil Operator | May 1998 |
| 815 | Sullivan Wesley L | Duncan, OK 73533 | Oil & Gas Operator | Mar 2002 |
| 816 | Sullivant G W | Oklahoma City, OK 73172-1135 | Oil & Gas Operator | Aug 2001 |
| 817 | Sunbelt Oil Investments Inc | Lindsay, OK 73052 | Oil & Gas Operator | May 1993 |
| 818 | Suoco Oil Corporation | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |
| 819 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |
| 820 | Superior Production MGMT Inc | Calumet, OK 73014 | Oil & Gas Operator | Mar 2015 |
| 821 | Survivor Oil Inc | Tulsa, OK 74133 | Oil & Gas Operator | Sep 2007 |
| 822 | Swenton, Michael J. | Tulsa, OK 74105 | Oil & Gas Operator | Jun 2025 |
| 823 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |
| 824 | Sydson D'Oro Expl. Co. | Houston, TX 77079 | Oil & Gas Operator | Jan 1992 |
| 825 | T & G Holding LLC | Pauls Valley, OK 73075-8663 | Oil & Gas Operator | Mar 2015 |
| 826 | T & J Operating | Ada, OK 74821-1547 | Oil Operator | Feb 2012 |
| 827 | T C Craighead & Company LLC | Ardmore, OK 73401 | Oil & Gas Operator | Aug 2019 |
| 828 | T-K Exploration Company | Oklahoma City, OK 73102-7029 | Oil & Gas Operator | Mar 2015 |
| 829 | Tapoil Inc | Elmore City, OK 73433-9077 | Oil & Gas Operator | Jul 2021 |
| 830 | Tau Ventures | Tulsa, OK 74105-1026 | Oil & Gas Operator | Jun 2025 |
| 831 | TD Oil & Gas LLC | Duncan, OK 73533-1851 | Oil Operator | Apr 2023 |
| 832 | TD Operating Inc | Hinton, OK 73047 | Oil & Gas Operator | Jul 2025 |
| 833 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 834 | Tekenergy, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 835 | Templar Operating LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Jun 2025 |
| 836 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 837 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | Jun 2025 |
| 838 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 839 | Texas Meridian Operating Co. Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 1993 |
| 840 | TGX Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2004 |
| 841 | The Quintin Little Company Inc | Ardmore, OK 73401 | Oil & Gas Operator | Jul 2025 |
| 842 | The Warren Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Jan 2016 |
| 843 | Thomas, R. W. Inc. | Norman, OK 73070 | Oil & Gas Operator | Apr 2015 |
| 844 | Thunder Oil & Gas, LLC | Ardmore, OK 73402 | Oil & Gas Operator | Jun 2025 |
| 845 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 846 | Tidemark Exploration | Tulsa, OK 74170 | Oil & Gas Operator | May 2005 |
| 847 | TKL Oil Properties Inc | Konawa, OK 74849 | Oil & Gas Operator | May 2025 |
| 848 | TLC Oil And Gas | Duncan, OK 73533-9477 | Oil & Gas Operator | Oct 2015 |
| 849 | Toco Oil & Gas Co | Grapevine, TX 76051 | Oil & Gas Operator | Feb 1993 |
| 850 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2025 |
| 851 | Toklan Oil Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 852 | Tola Production Company | Dallas, TX 75367 | Oil & Gas Operator | Oct 2025 |
| 853 | Toland & Johnston Inc | Edmond, OK 73034 | Oil & Gas Operator | Jun 2025 |
| 854 | Topsail Secondary Recovery LLC | Edmond, OK 73013 | Oil & Gas Operator | Feb 2025 |
| 855 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 856 | Trace Oil & Gas LP | Cement, OK 73017 | Oil & Gas Operator | Jun 2025 |
| 857 | Trail Ridge Energy Partners, LLC | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2025 |
| 858 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 859 | Trepco Production Company, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Jun 2025 |
| 860 | Tri Production Inc | Healdton, OK 73438 | Oil & Gas Operator | Jun 2025 |
| 861 | Triad Energy, Inc. | Oklahoma City, OK 73105-1401 | Oil & Gas Operator | Jul 2025 |
| 862 | Triexco Inc | Tulsa, OK 74119 | Oil & Gas Operator | Dec 2012 |
| 863 | Trigg Drilling Company Inc | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2013 |
| 864 | Trinity Oil & Gas Inc | Pauls Valley, OK 73075 | Oil Operator | Jun 2025 |
| 865 | Triple Diamond Energy Operating LLC | Dallas, TX 75254-8352 | Oil & Gas Operator | Jun 2014 |
| 866 | Tripledee Drilling Co Inc | Ardmore, OK 73402-1888 | Oil & Gas Operator | Dec 2015 |
| 867 | Tripledee Operating Company LLC | Ardmore, OK 73401 | Oil & Gas Operator | Nov 2022 |
| 868 | True Performance Administrators LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2025 |
| 869 | Tulsa Minerals Inc | Tulsa, OK 74136-1045 | Oil & Gas Operator | May 2013 |
| 870 | Twenty/Twenty Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jul 2025 |
| 871 | Twin Eagle Petroleum Corp | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2002 |
| 872 | Twisted Resources Inc | Blanchard, OK 73010-8463 | Oil & Gas Operator | Jun 2025 |
| 873 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 874 | Txok Energy Resources Company | Tulsa, OK 74172-0140 | Oil & Gas Operator | Feb 2017 |
| 875 | Unbridled Resources, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 876 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 877 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2025 |
| 878 | United Energy & Expl Inc | Ada, OK 74821-2449 | Oil & Gas Operator | Jun 2025 |
| 879 | United Energy & Exploration LLC | Ada, OK 74821 | Oil & Gas Operator | Jun 2025 |
| 880 | United Production Company LLC | Edmond, OK 73003 | Oil & Gas Operator | Jul 2025 |
| 881 | United States Gypsum Co | Oakfield, NY 14125 | Oil & Gas Operator | Dec 2024 |
| 882 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Oct 2025 |
| 883 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Oct 2025 |
| 884 | Validus Energy II Midcon LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 885 | Validus Inc | Fort Lauderdale, FL 33304 | Oil & Gas Operator | Jun 2025 |
| 886 | Valley Petrol Consulting Inc | Denton, TX 76205 | Oil Operator | Jun 2025 |
| 887 | Vastar Resources Inc | Houston, TX 77253 | Oil & Gas Operator | Jun 2025 |
| 888 | Vaughan Otto M | | Oil & Gas Operator | Apr 2014 |
| 889 | Veenker Resources, Inc. | Oklahoma City, OK 73113 | Oil & Gas Operator | Jul 2025 |
| 890 | Ventana Exploration And Production II LLC | Oklahoma City, OK 73134-2519 | Oil & Gas Operator | Jun 2025 |
| 891 | Verdad Oil & Gas Corporation | Dallas, TX 75235 | Oil & Gas Operator | Oct 2025 |
| 892 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 893 | Vistatex Energy LLC | Houston, TX 77057 | Oil & Gas Operator | Jun 2025 |
| 894 | Vitol Inc. | Houston, TX 77098 | Oil & Gas Operator | Sep 2023 |
| 895 | Vitruvian II Woodford LLC | The Woodlands, TX 77381-5259 | Oil & Gas Operator | May 2019 |
| 896 | VPR Operating LLC | Austin, TX 78746 | Oil & Gas Operator | Oct 2013 |
| 897 | W C T Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2025 |
| 898 | W-N Energy Corp | Tulsa, OK 74121-1468 | Oil & Gas Operator | Nov 1994 |
| 899 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 900 | Walden E F | Ada, OK 74820 | Oil & Gas Operator | Aug 2014 |