| 701 | Simpson Oil & Land Co. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 702 | Singer Oil Co LLC | Hennessey, OK 73742 | Oil & Gas Operator | Mar 2025 |
| 703 | Singer Oil Company | Oklahoma City, OK 73148 | Oil & Gas Operator | Feb 2025 |
| 704 | Sitco Inc | Yukon, OK 73099 | Oil & Gas Operator | Jul 1995 |
| 705 | Skycap Energy, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Mar 2025 |
| 706 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 707 | Slawson, Donald C. | Wichita, KS 67202 | Oil & Gas Operator | Oct 2024 |
| 708 | SLT Dakota Operating, Inc. | Yukon, OK 73099 | Oil & Gas Operator | May 2025 |
| 709 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 710 | Smith Production Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 711 | Snuffy'S Oilfield Service Inc | Hennessey, OK 73742-6511 | Oil & Gas Operator | Nov 2014 |
| 712 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 713 | Sooner Oil & Gas LLC | Fairview, OK 73737-1806 | Oil & Gas Operator | Mar 2025 |
| 714 | Sooner Oilfield Services Inc | Piedmont, OK 73078-0810 | Oil & Gas Operator | May 2024 |
| 715 | Sooner Trend Exploration Inc | Kingfisher, OK 73750-4752 | Oil & Gas Operator | Dec 2015 |
| 716 | Southern Int'L Inc | Oklahoma City, OK 73107 | Oil & Gas Operator | May 2007 |
| 717 | Southern Resources Inc | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Mar 2025 |
| 718 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 719 | Southwest Exploration Company | Oklahoma City, OK 73132-2230 | Oil & Gas Operator | Jun 2017 |
| 720 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 721 | Southwestern Exploration Consultants Inc | Oklahoma City, OK 73118-1116 | Oil & Gas Operator | Feb 2025 |
| 722 | SP Energy Development Company | Seattle, WA 98101-3277 | Oil & Gas Operator | Mar 2015 |
| 723 | Sparks Petroleum Company | Oklahoma City, OK 73128 | Oil & Gas Operator | Mar 1998 |
| 724 | Sparks Resources Inc | Bristow, OK 74010 | Oil & Gas Operator | Mar 2025 |
| 725 | Spectrum Energy Inc | Scottsdale, AZ 85257 | Oil & Gas Operator | Oct 2003 |
| 726 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Mar 2025 |
| 727 | Spring Operating Company | Edmond, OK 73034 | Oil & Gas Operator | Mar 2025 |
| 728 | Spring Valley Oil & Gas Inc | Drummond, OK 73735 | Oil & Gas Operator | Mar 2025 |
| 729 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 730 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 731 | Staghorn Petroleum II LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Mar 2025 |
| 732 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |
| 733 | Statex Petroleum Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 734 | Statoil Oil & Gas LP | Austin, TX 78730 | Oil & Gas Operator | Oct 2018 |
| 735 | Stephen Michael Inc | Midwest City, OK 73130-5200 | Oil & Gas Operator | Oct 2015 |
| 736 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Mar 2025 |
| 737 | Stewart K Petroleum Corp | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 738 | Stone Oak Operating LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Mar 2025 |
| 739 | Stoneriver Energy, LLC | Lubbock, TX 79424 | Oil & Gas Operator | May 2025 |
| 740 | Sunterra Energy Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2009 |
| 741 | Superior Midstream, LLC | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2020 |
| 742 | Sweetwater Exploration LLC | Norman, OK 73069-5636 | Oil & Gas Operator | Feb 2025 |
| 743 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |
| 744 | T E L Oil & Gas Corporation | Guymon, OK 73941 | Gas Operator | Feb 2025 |
| 745 | T S B T Oil & Gas Properties | Moore, OK 73160-8126 | Oil & Gas Operator | Jan 2018 |
| 746 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 747 | Tack Operating LLC | Oklahoma City, OK 73172-1492 | Oil & Gas Operator | Aug 2021 |
| 748 | Tamworth Resources LLC | Broken Arrow, OK 74012-0005 | Oil & Gas Operator | Feb 2025 |
| 749 | Tapstone Energy LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Mar 2025 |
| 750 | Tat, Inc. | Oklahoma City, OK 73127 | Oil & Gas Operator | Feb 2023 |
| 751 | TD Operating Inc | Hinton, OK 73047 | Oil & Gas Operator | Mar 2025 |
| 752 | Te-Ray Energy, Inc. | Oklahoma City, OK 73108 | Oil & Gas Operator | Feb 2025 |
| 753 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2025 |
| 754 | Tekenergy, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 755 | Temex Energy, Inc. | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 756 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Feb 2025 |
| 757 | Teocalli Exploration LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Mar 2025 |
| 758 | Terra Production Company | Okemah, OK 74859-5924 | Oil & Gas Operator | Apr 2020 |
| 759 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | Mar 2025 |
| 760 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 761 | Texas Meridian Operating Co. Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 1993 |
| 762 | TGX Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2004 |
| 763 | The Calvert Company | Oklahoma City, OK 73154-1589 | Oil & Gas Operator | Dec 2021 |
| 764 | The Quintin Little Company Inc | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2025 |
| 765 | Three Sands Oil Inc | Perry, OK 73077 | Oil & Gas Operator | May 2023 |
| 766 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 767 | Tidemark Exploration Inc | Tulsa, OK 74120 | Oil & Gas Operator | Apr 2019 |
| 768 | Tilley Oil & Gas, Inc. | Oklahoma City, OK 73172 | Oil & Gas Operator | May 2025 |
| 769 | TLS Oil & Gas Inc | Kingfisher, OK 73750-0901 | Oil & Gas Operator | Feb 2025 |
| 770 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2025 |
| 771 | Toland & Johnston Inc | Edmond, OK 73034 | Oil & Gas Operator | Mar 2025 |
| 772 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 773 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 774 | Tpet, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Mar 2008 |
| 775 | Trail Ridge Energy Partners, LLC | Grapevine, TX 76051 | Oil & Gas Operator | Mar 2025 |
| 776 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 777 | Transok LLC | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Jul 2020 |
| 778 | Travis Peak Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 779 | Traynor Oil & Gas Inc | Claremont, CA 91711-2837 | Oil & Gas Operator | Jan 2024 |
| 780 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | May 2025 |
| 781 | Trepco Production Company, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Mar 2025 |
| 782 | Trey Resources Inc. | Midland, TX 79710 | Oil & Gas Operator | Feb 2025 |
| 783 | Trigg Drilling Company Inc | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2013 |
| 784 | Trineha Inc | Ardmore, OK 73402-2478 | Oil & Gas Operator | Jun 2009 |
| 785 | Tripledee Drilling Co Inc | Ardmore, OK 73402-1888 | Oil & Gas Operator | Dec 2015 |
| 786 | Triplett Larry W | Oklahoma City, OK 73112-5325 | Oil & Gas Operator | Mar 2015 |
| 787 | Tripower Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2020 |
| 788 | Triumph Energy Partners LLC | Oklahoma City, OK 73102-5804 | Oil & Gas Operator | Feb 2025 |
| 789 | Triumph Resources Inc | Oklahoma City, OK 73114 | Oil & Gas Operator | Nov 2004 |
| 790 | Tucson Oil & Gas Inc | | Oil & Gas Operator | Aug 1994 |
| 791 | Tulsa Energy Partners LLC | Tulsa, OK 74103-4461 | Oil & Gas Operator | Mar 2025 |
| 792 | Turner Oil Company | Yale, OK 74085-0234 | Oil & Gas Operator | Nov 2014 |
| 793 | Turner Resources Inc | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2025 |
| 794 | Twenty/Twenty Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Mar 2025 |
| 795 | Twisted Resources Inc | Blanchard, OK 73010-8463 | Oil & Gas Operator | Mar 2025 |
| 796 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 797 | Txok Energy Resources Company | Tulsa, OK 74172-0140 | Oil & Gas Operator | Feb 2017 |
| 798 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 799 | Unicon Producing Company | Houston, TX 75252 | Gas Operator | Mar 1994 |
| 800 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |