| 801 | Twins Oil Co. | Monahans, TX 79756 | Oil & Gas Operator | Feb 2026 |
| 802 | Two Bit Operating Company LLC | Fort Worth, TX 76110 | Oil & Gas Operator | Feb 2026 |
| 803 | Two Black Bears Oil, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2003 |
| 804 | Two Oaks Operating Company, LLC. | Flower Mound, TX 75028 | Oil & Gas Operator | Mar 2008 |
| 805 | Two P Partners, LLC | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 806 | Twojo, Inc. | Longview, TX 75601 | Oil & Gas Operator | Nov 1996 |
| 807 | TX Enhanced Oil Recovery Co, LLC | Sealy, TX 77474 | Oil & Gas Operator | Feb 2026 |
| 808 | TX Heat Of The Permian Basin Inc | Odessa, TX 79768 | Oil & Gas Operator | Dec 2021 |
| 809 | TX Lone Star Operating Co, LLC | Sulphur SPGS, TX 75483 | Oil & Gas Operator | Feb 2026 |
| 810 | TX Petroleum Company | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Apr 1996 |
| 811 | Txco Resources Inc. | San Antonio, TX 78280 | Oil & Gas Operator | Feb 2026 |
| 812 | Txla Energy, Inc. | Houston, TX 77018 | Oil & Gas Operator | Feb 2026 |
| 813 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 814 | Txok Texas Energy Resources,L.P. | Dallas, TX 75251 | Oil & Gas Operator | Apr 2008 |
| 815 | Txon Partners, LLC | Houston, TX 77057 | Oil & Gas Operator | Jun 2017 |
| 816 | TXP, Incorporated | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2026 |
| 817 | Txu Fuel Company | Dallas, TX 75201 | Oil & Gas Operator | May 2004 |
| 818 | Txu Gas Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2004 |
| 819 | Txu Lone Star Pipeline | Dallas, TX 75201 | Oil & Gas Operator | Oct 2003 |
| 820 | TXX Operating LLC | Shreveport, LA 71133 | Oil & Gas Operator | Feb 2026 |
| 821 | Ty-Tex Exploration, Inc. | Tyler, TX 75711 | Oil Operator | Dec 2000 |
| 822 | Tyco Operating Co. | Archer City, TX 76351 | Oil & Gas Operator | Feb 2026 |
| 823 | Tyl Oil | Canon City, CO 81212 | Gas Operator | May 1994 |
| 824 | Tyler Oil & Gas Inc. | Tyler, TX 75702 | Oil & Gas Operator | Sep 2004 |
| 825 | Tyner Texas Operating Company | Dallas, TX 75248 | Oil & Gas Operator | Feb 2026 |