| 801 | Sellers' Lease Service | Flatonia, TX 78941 | Oil & Gas Operator | Jul 1994 |
| 802 | Sellmeyer Eugene | Collinsville, OK 74021 | Oil & Gas Operator | Mar 2015 |
| 803 | Sellmeyer Frank | San Rafael, CA 94901-1339 | Oil Operator | Dec 2014 |
| 804 | Selous Energy, LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Jul 2015 |
| 805 | Sem Operating Company LLC | Houston, TX 77042 | Oil & Gas Operator | Sep 2025 |
| 806 | Seminole Company (The) | | Oil Operator | Dec 1994 |
| 807 | Seminole Oil Productions LLC | Surprise, AZ 85387-2015 | Oil Operator | Apr 2020 |
| 808 | Seminole Production Co. | Silsbee, TX 77656 | Oil & Gas Operator | Oct 2002 |
| 809 | Seminole Senora Sand Unit #1, LLC | Rogers, AR 72758 | Gas Operator | Sep 2010 |
| 810 | Seminole Tank Service | Seminole, OK 74818-1587 | Oil & Gas Operator | May 2025 |
| 811 | Semo, Inc. | | Oil & Gas Operator | Feb 2002 |
| 812 | Semper Fidelis Oil & Gas, LLC | Allen, TX 75013 | Oil & Gas Operator | Apr 2013 |
| 813 | Senax Inc | Tulsa, OK 74105-2206 | Oil & Gas Operator | May 2025 |
| 814 | Sendero Energy Inc. | Dallas, TX 75205 | Oil & Gas Operator | Sep 2025 |
| 815 | Sendero Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 816 | Seneca Energy Corporation | Dover, OH 44622 | Oil & Gas Operator | Dec 2020 |
| 817 | Seneca Oil Company | Tulsa, OK 74121-1518 | Oil & Gas Operator | Jan 2015 |
| 818 | Seneca Resources Co LLC | Cranberry Township, PA 16066 | Oil & Gas Operator | Jun 2025 |
| 819 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 820 | Seneca Stone Corporation | Seneca Falls, NY 13148 | Gas Operator | Dec 2024 |
| 821 | Seneca Western Minerals Corp. | | Oil & Gas Operator | Dec 2009 |
| 822 | Seneca-Cashco | | Oil & Gas Operator | Sep 1986 |
| 823 | Senico Production Company | Irving, TX 75016-5229 | Oil & Gas Operator | Mar 2002 |
| 824 | Senior Drilling & Expl Co Inc. | | Oil & Gas Operator | Apr 1993 |
| 825 | Senior G&A Operating Co Inc | | Oil & Gas Operator | Nov 1991 |
| 826 | Senkel, Wesley, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2007 |
| 827 | Senora Resources, Inc. | Dime Box, TX 77853 | Oil & Gas Operator | Sep 2025 |
| 828 | Senske, Richard S. | Ashville, NY 14710 | Gas Operator | Dec 2024 |
| 829 | Sensor Oil & Gas Inc | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 830 | Sentinel Peak Resources California LLC | | Oil & Gas Operator | Jul 2025 |
| 831 | Sentinel Petroleum Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2020 |
| 832 | Sentry Exploration, Inc. | Houston, TX 77006 | Oil & Gas Operator | Sep 2025 |
| 833 | Sep Cisco Dome II, LLC | Orem, UT 84097 | Oil & Gas Operator | Jun 2025 |
| 834 | Sep Cisco Dome LLC | Orem, UT 84097 | Oil & Gas Operator | Mar 2015 |
| 835 | Sep Nosr LLC | Orem, UT 84097 | Oil & Gas Operator | Jun 2025 |
| 836 | Sep, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1994 |
| 837 | September Corp | Titusville, PA 16354-6833 | Oil & Gas Operator | Dec 2024 |
| 838 | Sepulvado Oilfield Service Inc | | Oil & Gas Operator | Jul 2010 |
| 839 | Sequel Energy, LLC | | Oil & Gas Operator | May 2014 |
| 840 | Sequoia Energy Resources | Dallas, TX 75207 | Oil & Gas Operator | Sep 2025 |
| 841 | Sequoia Exploration Inc. | | Oil & Gas Operator | Jun 2025 |
| 842 | Sequoia Fossil Fuels, Inc. | Albany, TX 76430 | Oil & Gas Operator | Sep 2025 |
| 843 | Sequoia Management, LLC | Houston, TX 77060 | Oil & Gas Operator | Nov 2009 |
| 844 | Sequoia Natural Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | Sep 2025 |
| 845 | Sequoyah Energy Holdings LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jun 2025 |
| 846 | Ser E&P, Inc. | McKinney, TX 75069 | Oil & Gas Operator | Sep 2025 |
| 847 | Serco Operating LLC | Katy, TX 77450 | Oil Operator | Sep 2025 |
| 848 | Serendipity Exploration, Inc. | Weatherford, TX 76087 | Gas Operator | May 1997 |
| 849 | Serendipity Operating LLC | Sparks, NV 89436-9328 | Oil & Gas Operator | May 2025 |
| 850 | Serendipity Production Company LC | Guthrie, OK 73044 | Oil & Gas Operator | Apr 2020 |
| 851 | Sergeant Gas Co Inc | Wilcox, PA 15870-1810 | Oil & Gas Operator | Dec 2024 |
| 852 | Serio Energy Corporation | | Oil & Gas Operator | Jul 2000 |
| 853 | Serio Exploration Company | | Oil Operator | Jan 1992 |
| 854 | Serio Oil Corp. | | Oil & Gas Operator | Sep 1991 |
| 855 | Serio Operating Company | | Oil & Gas Operator | Mar 2007 |
| 856 | Serio-Punches Oil Co | | Oil Operator | Jan 2008 |
| 857 | Serna Inc. | Austin, TX 78733 | Oil Operator | Sep 2025 |
| 858 | Serra Energy, Inc. | Hailey, ID 83333 | Oil & Gas Operator | May 2011 |
| 859 | Servco Productio | | Oil Operator | Dec 1992 |
| 860 | Service Clearing Corp | Dallas, TX 75229 | Oil & Gas Operator | Sep 2025 |
| 861 | Service Drilling Co. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1998 |
| 862 | Service Drilling Co., L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2003 |
| 863 | Service Production Company, Inc. | Santa Fe, TX 77510 | Oil & Gas Operator | May 1999 |
| 864 | Ses Oil | | Oil Operator | Jun 2004 |
| 865 | Ses Production | | Oil & Gas Operator | Oct 2023 |
| 866 | Sescil, Douglas W. | Akron, NY 14001 | Gas Operator | Dec 2024 |
| 867 | Sessions Billy C | Muskogee, OK 74401-5323 | Oil Operator | Apr 2007 |
| 868 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 869 | Setex Oil Company, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jan 2000 |
| 870 | Settco Oil & Gas | | Oil & Gas Operator | May 1994 |
| 871 | Settlers Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Nov 2000 |
| 872 | Settlers Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Apr 1998 |
| 873 | Sev Texas Operating, LLC | Long Beach, CA 90755 | Oil & Gas Operator | Sep 2025 |
| 874 | Sevarg Company, Inc. | | Oil & Gas Operator | Feb 2016 |
| 875 | Seven Cross Operating, LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Sep 2025 |
| 876 | Seven Falls Company | Dallas, TX 75201 | Oil & Gas Operator | May 2008 |
| 877 | Seven Horses LLC | Alva, OK 73717-5004 | Oil & Gas Operator | Jun 2025 |
| 878 | Seven J Oil Inc | Jenning, OK 74038-9729 | Oil & Gas Operator | Apr 2025 |
| 879 | Seven Lakes Operating LLC | Austin, TX 78746 | Oil Operator | Sep 2025 |
| 880 | Seven Sisters Oil & Gas LLC | Casper, WY 82602 | Oil & Gas Operator | Jan 2022 |
| 881 | Seven To One Oil & Gas LLC | Magnolia, OH 44643 | Oil & Gas Operator | Dec 2024 |
| 882 | Seven Wells Oil & Gas Expl. | Abilene, TX 79601 | Oil & Gas Operator | Jun 2014 |
| 883 | Seventh Corporation The | Oklahoma City, OK 73107 | Oil & Gas Operator | May 2006 |
| 884 | Seventy Oil Co. | Freer, TX 78357 | Oil & Gas Operator | Mar 2002 |
| 885 | Sevenx, LLC | Iowa Park, TX 76367 | Oil Operator | Sep 2025 |
| 886 | Severtson, James C. | Allegany, NY 14706 | Oil & Gas Operator | Dec 2024 |
| 887 | Sevitski & Associates Inc | Pryor, OK 74361 | Oil & Gas Operator | Dec 2000 |
| 888 | Sewell Development Co Inc | | Oil & Gas Operator | Apr 1993 |
| 889 | Sexton Oil Company | Camden, AR 71701 | Oil Operator | Apr 2024 |
| 890 | Seydell, E. Morris | Wichita Falls, TX 76307 | Oil Operator | Feb 1993 |
| 891 | Seymour Oil Co., Inc. | Edmond, OK 73025 | Oil & Gas Operator | Jul 2011 |
| 892 | Seymour, James & Lorraine | Cut Bank, MT 59427 | Oil Operator | Jul 2022 |
| 893 | Sfeop | Midland, TX 79701 | Oil & Gas Operator | Mar 1994 |
| 894 | SFJV Enterprises, Inc. | Berclair, TX 78107 | Gas Operator | Aug 1998 |
| 895 | SFM Holdings, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 1995 |
| 896 | SG Interests I LTD | Houston, TX 77007 | Oil & Gas Operator | Jul 2025 |
| 897 | SG Interests, Inc. | Houston, TX 77010 | Oil & Gas Operator | Jun 2007 |
| 898 | SGB Oil LLC | Luling, TX 78648 | Oil Operator | Sep 2025 |
| 899 | Sgcu GP LLC | Casper, WY 82602 | Oil Operator | Jun 2025 |
| 900 | SGP Operating LLC | Dallas, TX 75205 | Oil & Gas Operator | Sep 2025 |