| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Jul 2025 |
| 2 | Tesoro Petroleum Corporation | Oil & Gas Operator | May 1982 | |
| 3 | Three Forks Resources LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Oct 2025 |
| 4 | Thunder Basin Resources LLC | Denver, CO 80203 | Oil & Gas Operator | Jul 2023 |
| 5 | Timberline Production Company LLC | Casper, WY 82601 | Oil & Gas Operator | Oct 2020 |
| 6 | Toco Corporation | Oil & Gas Operator | Oct 1991 | |
| 7 | Townsend Company | Abilene, TX 79608 | Oil & Gas Operator | Dec 2021 |
| 8 | Trout Kye Jr | Oil & Gas Operator | Dec 2010 | |
| 9 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Aug 2025 |
| 10 | Tyler Rockies Exploration LTD | Tyler, TX 75710-0119 | Oil & Gas Operator | Aug 2025 |