| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | T. E. Adams Petroleum Corp. | Oil & Gas Operator | Mar 2025 | |
| 2 | TB Properties | Oil & Gas Operator | Mar 2025 | |
| 3 | Temescal Resources LLC | Oil & Gas Operator | Apr 2025 | |
| 4 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Mar 2025 |
| 5 | Texas Pacific Oil Company Inc. | Oil & Gas Operator | Dec 1980 | |
| 6 | Texinia Oil & Gas Inc. | Dallas, TX 75214 | Oil & Gas Operator | Mar 2025 |
| 7 | The Termo Company | Long Beach, CA 90801 | Oil & Gas Operator | Apr 2025 |
| 8 | Thompson Oil Co. | Corsicana, TX 75151 | Oil & Gas Operator | Mar 2025 |
| 9 | Tiger Oil Company | Dallas, TX 75221 | Oil & Gas Operator | May 2007 |
| 10 | TPC Operating Inc. | Oil & Gas Operator | Mar 2025 | |
| 11 | Tri-Valley Oil & Gas Co. | Oil & Gas Operator | Mar 2025 | |
| 12 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |