| Abbreviation | Definition |
|---|---|
| TDS | Telephone & Data Systems, Inc. |
| TDS | Telephone & Data Systems, Incorporated |
| TDSPA | Telephone & Data Systems, Inc. Capital I |
| TDSPB | Telephone & Data Systems, Inc. Capital II |
| TDX | Thermedics Detection, Inc. |
| TFF | Technology Flavors & Fragrance, Inc. |
| TFG | Thermo Fibergen, Inc. |
| TFH | Transfinancial Holdings, Inc. |
| TFN | Transnational Financial Network Corporation |
| TFT | Thermo Fibertek, Inc. |
| TGC | Tengasco |
| TGY | Targets Trust XVII |
| THD | 3DShopping.Com |
| THI | Thermo Instrument Systems, Inc. |
| THK | Thackeray Corporation |
| THM | Thermwood Corporation |
| THN | Thermoretec Corporation |
| THR | Three Rivers Financial Corporation |
| THT | TodHunter International, Inc. of Delaware |
| THV | Thermoview Industries, Inc. |