| 27801 | Swan Production Co. | Jacksboro, TX 76458 | Oil & Gas Operator | Nov 2009 |
| 27802 | Swan Richard N | Claremore, OK 74018-0503 | Oil Operator | Aug 2013 |
| 27803 | Swander, Everett | Cunningham, KS 67035 | Oil Operator | May 1998 |
| 27804 | Swanhart Angelo & Deborah | Indiana, PA 15701-6301 | Gas Operator | Dec 2025 |
| 27805 | Swanner Properties | Wichita Falls, TX 76309 | Oil & Gas Operator | Jun 2026 |
| 27806 | Swanson & Vestal | Electra, TX 76360 | Oil & Gas Operator | Oct 1997 |
| 27807 | Swanson Douglas L & Sharon | Bartlesville, OK 74003-9319 | Oil Operator | Mar 2026 |
| 27808 | Swanson G T | Duncan, OK 73533 | Oil & Gas Operator | Nov 1998 |
| 27809 | Swanson Oil & Gas LLC | Williston, ND 58802 | Oil & Gas Operator | Apr 2026 |
| 27810 | Swanson Operating, Inc. | Holliday, TX 76366 | Oil Operator | Jun 2026 |
| 27811 | Swanson, Tom | Electra, TX 76360 | Oil & Gas Operator | Oct 2004 |
| 27812 | Swanson, Tommy Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Mar 2017 |
| 27813 | Swaringin, Howard Operating | Maryneal, TX 79535 | Oil & Gas Operator | May 2003 |
| 27814 | Swartout, John D & Sandra | Sherman, NY 14781 | Gas Operator | Dec 2024 |
| 27815 | Swartz Oil Company | San Angelo, TX 76906 | Oil & Gas Operator | Jun 2026 |
| 27816 | Swartz, Guy A. | San Angelo, TX 76904 | Oil & Gas Operator | Aug 1993 |
| 27817 | SWD Acidizing, Inc. | | Oil Operator | Feb 2014 |
| 27818 | SWD, Inc. | | Oil Operator | Jan 2025 |
| 27819 | Swearingen Robert E Dba Sabo Production | Seminole, OK 74868 | Oil & Gas Operator | Feb 2026 |
| 27820 | Sweet Crude Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | Jun 2026 |
| 27821 | Sweet Texas T Energy LLC | Clyde, TX 79510 | Oil Operator | Jun 2026 |
| 27822 | Sweetwater Drilling Co., Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Jun 2026 |
| 27823 | Sweetwater Exploration LLC | Norman, OK 73069-5636 | Oil & Gas Operator | Feb 2026 |
| 27824 | Sweetwater Production, Inc. | Abilene, TX 79602 | Oil & Gas Operator | Jun 2026 |
| 27825 | Swenco-Western I | | Oil Operator | Sep 1987 |
| 27826 | Swenco-Western Inc | Houston, TX 77060 | Oil & Gas Operator | Jan 1997 |
| 27827 | Swenson Backhoe Service, Inc. | Electra, TX 76360 | Oil Operator | Jun 2026 |
| 27828 | Swenson, Clifford E. | Henrietta, TX 76365 | Oil & Gas Operator | Jun 2026 |
| 27829 | Swenton Michael J | Tulsa, OK 74105 | Oil & Gas Operator | Mar 2026 |
| 27830 | Swepi LP | Houston, TX 77079 | Oil & Gas Operator | Jul 2020 |
| 27831 | Swepi LP And Miller Brothers | | Oil & Gas Operator | Oct 1992 |
| 27832 | Swepi/Western Division | Houston, TX 77210 | Oil & Gas Operator | Aug 1984 |
| 27833 | Swevco-Sabw LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 27834 | Swiess & Thomas | San Antonio, TX 78247 | Oil Operator | Jun 2026 |
| 27835 | Swift A W & Company Inc | Sand Springs, OK 74063-5124 | Oil Operator | Jun 2003 |
| 27836 | Swift Energy Com | | Oil & Gas Operator | Sep 1995 |
| 27837 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 27838 | Swift Energy Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Jun 2017 |
| 27839 | Swinea Well Service Inc | Drumright, OK 74030 | Oil & Gas Operator | Mar 2015 |
| 27840 | Swingle Drilling Inc | Crooksville, OH 43731 | Oil & Gas Operator | Dec 2025 |
| 27841 | Swinkwood Oil Co | | Oil Operator | Apr 2015 |
| 27842 | Switchgrass E&P Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2026 |
| 27843 | SWJN Oil Company | Kilgore, TX 75663 | Oil Operator | Jun 2026 |
| 27844 | SWN Production (Louisiana), LLC | | Oil & Gas Operator | Dec 2024 |
| 27845 | SWN Production (Ohio), LLC | Spring, TX 77389 | Oil & Gas Operator | Mar 2024 |
| 27846 | SWN Production Company, LLC | Spring, TX 77391 | Oil & Gas Operator | Dec 2025 |
| 27847 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |
| 27848 | Swo & Ism, LLC | | Oil & Gas Operator | Dec 2021 |
| 27849 | Swope Corp. | Austin, TX 78735 | Oil & Gas Operator | Jun 2026 |
| 27850 | Swordfish Energy Operating, LLC | Houston, TX 77060 | Oil & Gas Operator | Jun 2026 |
| 27851 | SWS | Humble, TX 77338 | Oil Operator | Jun 2026 |
| 27852 | SWS Operating LLC | Lawton, OK 73501-3236 | Oil Operator | Sep 2024 |
| 27853 | SWV Energy Operating LLC | Spring, TX 77379 | Gas Operator | Dec 2018 |
| 27854 | SX54, LLC | Sheridan, WY 82801 | Oil Operator | Nov 2017 |
| 27855 | Sycamore Development Partners LLC | | Oil & Gas Operator | Mar 2026 |
| 27856 | Sydri Operating, LLC | Dallas, TX 75231 | Oil & Gas Operator | Jun 2026 |
| 27857 | Sydson D'Oro Exploration Co. | Houston, TX 77079 | Oil & Gas Operator | Jan 1992 |
| 27858 | Sydson Energy, Inc. | Houston, TX 77019 | Oil & Gas Operator | Jun 2026 |
| 27859 | Syj Oil & Gas | San Antonio, TX 78209 | Oil Operator | Sep 2000 |
| 27860 | Syj Oil & Gas, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jun 2026 |
| 27861 | Sylvan Energy, LLC | Pittsburgh, PA 15211 | Oil & Gas Operator | Jun 2026 |
| 27862 | Sylvan Oil Operating Company | Tulsa, OK 74103-3516 | Oil & Gas Operator | Apr 2016 |
| 27863 | Sylvite Corp | Tulsa, OK 741363908 | Oil & Gas Operator | Dec 2000 |
| 27864 | Symank, Steve | Olney, TX 76374 | Oil & Gas Operator | Jun 2026 |
| 27865 | Symba American Oil, Inc | Houston, TX 77056 | Oil Operator | Jun 2026 |
| 27866 | Synd Enterprises Inc | Lakewood, NY 14750-9613 | Oil & Gas Operator | Dec 2006 |
| 27867 | Syndex Resources, Inc. | Wellesley, MA 02181-000 | Oil & Gas Operator | Dec 2021 |
| 27868 | Synergex Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2026 |
| 27869 | Synergy Development Corp | | Oil Operator | Apr 2011 |
| 27870 | Synergy Offshore LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2022 |
| 27871 | Synergy Oil & Gas LLC | | Oil & Gas Operator | Dec 2025 |
| 27872 | Synergy Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | Nov 2019 |
| 27873 | Synergy Oil & Gas, Inc. (A) | Houston, TX 77024 | Oil & Gas Operator | Aug 2001 |
| 27874 | Synergy Oil & Gas, L.P. | Houston, TX 77024 | Oil & Gas Operator | May 2012 |
| 27875 | Synergy Operating Co., LLC | Dallas, TX 75225 | Oil & Gas Operator | Apr 2026 |
| 27876 | Synergy Operating LLC | Farmington, NM 87499 | Oil & Gas Operator | Nov 2025 |
| 27877 | Synergy Production Company | Houston, TX 77024 | Oil & Gas Operator | Jan 1996 |
| 27878 | Synergy Resources | Artesia, NM 88210 | Oil & Gas Operator | Jan 2015 |
| 27879 | Syntax Energy Corporation | Denton, TX 76210 | Oil Operator | Jun 2026 |
| 27880 | Synthetic Energy Corporation | Houston, TX 77006 | Oil Operator | Jun 2026 |
| 27881 | Szumigala, Edward R. & Ruth A. | Dunkirk, NY 14048 | Gas Operator | Dec 2024 |
| 27882 | T & A Resources LLC | Salyersville, KY 41465 | Oil Operator | Dec 2023 |
| 27883 | T & B Drilling, Inc | Columbia, KY 42728 | Oil Operator | Dec 2023 |
| 27884 | T & B Oil Company Inc | Ardmore, OK 73401-3709 | Oil & Gas Operator | Apr 2015 |
| 27885 | T & B Resources | | Oil & Gas Operator | Jul 1990 |
| 27886 | T & C MFG. & Operating, Inc. | Great Bend, KS 67530 | Oil Operator | May 2022 |
| 27887 | T & C Oil, Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2024 |
| 27888 | T & D Oil | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2026 |
| 27889 | T & D Oil Co. | Victoria, KS 67671 | Oil Operator | Apr 1996 |
| 27890 | T & D Oil Compan | | Oil Operator | Jan 1992 |
| 27891 | T & D Oil LLC (Osage Only) | | Oil & Gas Operator | Feb 2026 |
| 27892 | T & F Exploration, LP | Pittsburgh, PA 15241-1375 | Oil & Gas Operator | Oct 2025 |
| 27893 | T & F Oil Company | | Oil Operator | Jan 2025 |
| 27894 | T & F Oil Company, LLC | | Oil Operator | Oct 2011 |
| 27895 | T & G Energy LLC | Dallas, TX 75230 | Oil Operator | Nov 2010 |
| 27896 | T & G Holding LLC | Pauls Valley, OK 73075-8663 | Oil & Gas Operator | Mar 2015 |
| 27897 | T & G Oil Operations LLC | | Oil Operator | Feb 2026 |
| 27898 | T & G Oil, Inc. | White Oak, TX 75693 | Oil & Gas Operator | Dec 2010 |
| 27899 | T & I Petroleum Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2005 |
| 27900 | T & J Oil Production, L.L.C. | Lone Grove, OK 73443 | Oil & Gas Operator | Mar 2026 |