| 1801 | TXP Operating Co. | | Oil & Gas Operator | Jul 1992 |
| 1802 | TXP, Incorporated | San Angelo, TX 76906 | Oil & Gas Operator | Aug 2026 |
| 1803 | Txu Fuel Company | Dallas, TX 75201 | Oil & Gas Operator | May 2004 |
| 1804 | Txu Gas Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2004 |
| 1805 | Txu Lone Star Pipeline | Dallas, TX 75201 | Oil & Gas Operator | Oct 2003 |
| 1806 | TXX Operating LLC | Shreveport, LA 71133 | Oil & Gas Operator | Aug 2026 |
| 1807 | Ty-Tex Exploration, Inc. | Tyler, TX 75711 | Oil Operator | Dec 2000 |
| 1808 | Tyco Incorporate | | Oil & Gas Operator | Oct 1995 |
| 1809 | Tyco Oil Co. | | Oil Operator | Apr 2026 |
| 1810 | Tyco Operating Co. | Archer City, TX 76351 | Oil & Gas Operator | Aug 2026 |
| 1811 | Tyco, Inc. | Independence, KS 67301 | Oil & Gas Operator | Jan 1998 |
| 1812 | Tygr Operating Company, LLC | | Oil & Gas Operator | Nov 2024 |
| 1813 | Tyl Oil | Canon City, CO 81212 | Gas Operator | May 1994 |
| 1814 | Tyler Enterprises Inc | Bristow, OK 74010-3192 | Oil & Gas Operator | Feb 2004 |
| 1815 | Tyler Oil & Gas Inc. | Tyler, TX 75702 | Oil & Gas Operator | Sep 2004 |
| 1816 | Tyler Oil Company | Billings, MT 59104-3203 | Oil & Gas Operator | Nov 2019 |
| 1817 | Tyler Production, LLC | | Oil & Gas Operator | Jul 2013 |
| 1818 | Tyler Rockies Exploration LTD | Tyler, TX 75710-0119 | Oil & Gas Operator | Dec 2025 |
| 1819 | Tyler, Scott A | | Oil & Gas Operator | May 2026 |
| 1820 | Tyler, Steven Lee | | Oil Operator | May 2014 |
| 1821 | Tyluka Operations, LLC | Hays, KS 67601 | Oil Operator | Mar 2026 |
| 1822 | Tyner Texas Operating Company | Dallas, TX 75248 | Oil & Gas Operator | Aug 2026 |
| 1823 | Tyrex Oil Company | Casper, WY 82602 | Oil & Gas Operator | May 1997 |
| 1824 | Tyro Oil Develop | | Oil Operator | Jul 1991 |
| 1825 | Tyrok | | Oil & Gas Operator | Nov 2010 |
| 1826 | Tysco Oil And Gas Corp. | | Oil & Gas Operator | Dec 2024 |
| 1827 | Tyson Gary | Hobart, OK 73651-6413 | Oil & Gas Operator | Mar 2018 |
| 1828 | Tyson Oil Co. | | Oil Operator | Jan 2025 |
| 1829 | Tyson Olan | Hobart, OK 73651-6413 | Oil & Gas Operator | Apr 2015 |
| 1830 | Tytan Operating Company LLC | Edmond, OK 73083-3794 | Oil & Gas Operator | May 2016 |