| 801 | Spring Tree Management LC | Abilene, TX 79604 | Oil Operator | May 2013 |
| 802 | Springfield Oil Services, Inc. | Mamaroneck, NY 10543 | Oil & Gas Operator | Jul 2025 |
| 803 | Springs, Jesse | Luling, TX 78648 | Oil & Gas Operator | Jun 1998 |
| 804 | Sproul, C. R. Inc. | Eldorado, TX 76936 | Oil & Gas Operator | Aug 2000 |
| 805 | Spruiell Drilling Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Jul 2025 |
| 806 | Spur Energy | Midland, TX 79708 | Oil & Gas Operator | Mar 1996 |
| 807 | Spur Operating Co. | Austin, TX 78701 | Oil & Gas Operator | Jul 2025 |
| 808 | Square Mile Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 809 | Square One Corporation | Giddings, TX 78942 | Oil & Gas Operator | Dec 2012 |
| 810 | Square One Energy, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Oct 2015 |
| 811 | Squaw Mountain Oil, LLC | Jacksboro, TX 76458 | Oil Operator | Jul 2025 |
| 812 | Squyres Oil Co., Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 2024 |
| 813 | SR Production Corp. | Liberty, TX 77575 | Oil & Gas Operator | Mar 2010 |
| 814 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 815 | SRS Properties, LLC | Whitehouse, TX 75791 | Oil & Gas Operator | Jul 2025 |
| 816 | SRV Oil Co | Coleman, TX 76834 | Oil Operator | Jul 2025 |
| 817 | SS Operating LLC | Water Valley, TX 76958 | Oil Operator | Jul 2025 |
| 818 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Jul 2025 |
| 819 | St. Cajetan Oil Company, LLC | Gainesville, TX 76240 | Oil & Gas Operator | Jul 2025 |
| 820 | St. Clair Energy Corporation | Tulsa, OK 74153 | Oil & Gas Operator | Mar 2008 |
| 821 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 822 | St. Mary Energy Company | Houston, TX 77079 | Oil & Gas Operator | Aug 2008 |
| 823 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 824 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 825 | Sta-Kel Incorporated | Graham, TX 76450 | Oil & Gas Operator | Dec 2000 |
| 826 | Stablerock Energy L.L.C. | Oklahoma City, OK 73106 | Oil & Gas Operator | Jul 2025 |
| 827 | Stacha, Eddy A. | Rice, TX 75155 | Oil & Gas Operator | Jul 2025 |
| 828 | Stacy Reamy | Purdon, TX 76679 | Oil Operator | Jul 2025 |
| 829 | Stagg Investment Group, Inc. | Midland, TX 79701 | Oil Operator | May 2013 |
| 830 | Staggered T Oil LLC | Quanah, TX 79252 | Oil Operator | Jul 2025 |
| 831 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 832 | Staghorn Petroleum II LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | May 2025 |
| 833 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |
| 834 | Stahl Petroleum Co. | Amarillo, TX 79118 | Oil & Gas Operator | Aug 2003 |
| 835 | Stal Oil Production, L.L.C. | Argyle, TX 76226 | Oil Operator | Jul 2025 |
| 836 | Staley Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2000 |
| 837 | Staley Operating Co. | Midland, TX 79702 | Oil & Gas Operator | Jan 2022 |
| 838 | Staley, Jack C. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2000 |
| 839 | Stalking Horse Energy, Limited Liability Company | La Porte, TX 77571 | Oil & Gas Operator | Jul 2025 |
| 840 | Stallion Energy LLC | Houston, TX 77090 | Oil & Gas Operator | Oct 2009 |
| 841 | Stallion Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2017 |
| 842 | Stallion Oil Company | Lafayette, LA 70505 | Oil & Gas Operator | Jun 2004 |
| 843 | Stallion Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 844 | Stampede Energy Corp. | Canada, 00100 | Oil & Gas Operator | Mar 2000 |
| 845 | Stamper Operating Co., Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Jul 2025 |
| 846 | Standard Oil Company, Inc. | Parkesburg, WV 26103 | Oil & Gas Operator | Mar 2022 |
| 847 | Standard Oil Tools, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Jul 2025 |
| 848 | Standard Resources Corp. | Houston, TX 77063 | Oil & Gas Operator | Jul 2025 |
| 849 | Stanolind Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Apr 2008 |
| 850 | Stanolind Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2021 |
| 851 | Stanolind Permian LLC | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 852 | Stanolind Production LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2020 |
| 853 | Stanotex, LLC | Katy, TX 77494 | Oil & Gas Operator | Jul 2025 |
| 854 | Stanton Mineral Development Inc | Austin, TX 78759 | Oil & Gas Operator | Jul 2025 |
| 855 | Staples, James W. | Tuleta, TX 78162 | Oil & Gas Operator | Sep 2014 |
| 856 | Staples, James W. Prod. Co. | Tuleta, TX 78162 | Oil & Gas Operator | Jul 2025 |
| 857 | Staples, Tommy Oil Co. | Pettus, TX 78146 | Oil & Gas Operator | Mar 2008 |
| 858 | Star Energy Inc | Dayton, PA 16222-4325 | Oil & Gas Operator | Dec 2024 |
| 859 | Star Of Texas Energy SRVS, Inc. | Austin, TX 78702 | Oil & Gas Operator | Jul 2025 |
| 860 | Star Oil & Gas | Ben Bolt, TX 78342 | Oil & Gas Operator | Jul 2025 |
| 861 | Star One Energy, Inc. | Fort Worth, TX 76163 | Oil & Gas Operator | May 2012 |
| 862 | Star Production, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Jul 2025 |
| 863 | Star Royalty Company | Oklahoma City, OK 73177 | Gas Operator | Sep 1998 |
| 864 | Star-Jet Co. | Gainesville, TX 76240 | Oil Operator | Jul 2025 |
| 865 | Starco Exploration, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Jul 2025 |
| 866 | Stardust Leasing, Inc. | Richmond, TX 77469 | Oil & Gas Operator | Jul 1999 |
| 867 | Stark Petroleum | Tuleta, TX 78162 | Oil & Gas Operator | Jul 2025 |
| 868 | Starkey Oilfield Service, Inc. | Sweet Home, TX 77987 | Oil & Gas Operator | Aug 2004 |
| 869 | Starlight Ridge | Whitesboro, TX 76273 | Oil & Gas Operator | Jul 2025 |
| 870 | Starr Operating Company | Austin, TX 78759 | Oil & Gas Operator | Jul 2025 |
| 871 | Starr Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2025 |
| 872 | Starrak Operating Company, Inc. | Midland, TX 79706 | Oil & Gas Operator | Jun 1999 |
| 873 | Startap, Inc. | Conroe, TX 77305 | Oil Operator | Jul 2025 |
| 874 | Startex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Jul 2025 |
| 875 | Stasney Well Service, LLC | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 876 | Stasney, H. R. & Sons, LTD. | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 877 | Statex Operating, LLC | Dallas, TX 75229 | Oil & Gas Operator | Mar 2007 |
| 878 | Statex Petroleum Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 879 | Statia Enterprises, Inc | Irving, TX 75014 | Oil & Gas Operator | Jul 2025 |
| 880 | Statoil Oil & Gas LP | Austin, TX 78730 | Oil & Gas Operator | Oct 2018 |
| 881 | Statoil Texas Onshore Prop LLC | Austin, TX 78730 | Oil & Gas Operator | Dec 2018 |
| 882 | Staub, Larry | Richardson, TX 75080 | Oil & Gas Operator | Aug 2003 |
| 883 | Staub, Larry, Inc. | Azle, TX 76020 | Oil & Gas Operator | Jul 2025 |
| 884 | STB Energy Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Jul 2008 |
| 885 | Steadfast Oil & Gas, LLC | Midland, TX 79707 | Oil & Gas Operator | Oct 2022 |
| 886 | Stealth Onsite Solutions LLC | Pasadena, TX 77505 | Oil Operator | Jul 2025 |
| 887 | Stealth, Inc. | Cross Plains, TX 76443 | Gas Operator | Mar 1997 |
| 888 | Stearns Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 1993 |
| 889 | Steele, Mark E. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 890 | Steinberger, D. | Windthorst, TX 76389 | Oil & Gas Operator | Oct 1995 |
| 891 | Steinberger, Gerald | Windthorst, TX 76389 | Oil & Gas Operator | Sep 2007 |
| 892 | Steindorf, Bert Oil & Gas Co. | Floresville, TX 78114 | Oil & Gas Operator | Jul 2025 |
| 893 | Steinman, Frank C. | Electra, TX 76360 | Oil & Gas Operator | Jul 2025 |
| 894 | Stelbar Oil Corp | Wichita, KS 67206 | Oil & Gas Operator | Aug 1995 |
| 895 | Stelbar Oil Corporation, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Mar 2025 |
| 896 | Steller Energy & Investment Corp | Plano, TX 75093 | Oil & Gas Operator | Feb 2021 |
| 897 | Stellex | De Leon, TX 76444 | Oil & Gas Operator | Jul 2025 |
| 898 | Stelucan Energy, LLC | Wichita Falls, TX 76310 | Oil & Gas Operator | Jul 2025 |
| 899 | Stelzer Drilling Co. Inc. | Post, TX 79356 | Oil Operator | Jul 2025 |
| 900 | Stelzer, E.A. Oil Company | Post, TX 79356 | Oil & Gas Operator | Feb 2002 |