| Abbreviation | Definition |
|---|---|
| TSSS | Triple S Plastics, Inc. |
| TSST | Tesseract Group, Inc. |
| TSSW | Touchstone Software Corporation |
| TST | TheStreet, Inc. |
| TSTA | Turbosonic Technologies, Inc. |
| TSTF | Teamstaff, Inc. |
| TSTN | Turnstone Systems |
| TSUN | Transun International Airways, Inc. |
| TSVL | Trumbull Savings & Loan Company |
| TSYI | Terra Systems, Inc. |
| TTEC | Teletech Holders, Inc. |
| TTEC | TeleTech Holdings, Incorporated |
| TTEI | Tree Technology International, Inc. |
| TTEL | Tritel, Inc. |
| TTEN | 3TEC Energy Corporation |
| TTEN | TEC Energy Corporation |
| TTFC | Teleficiency Holding Corporation |
| TTGGQ | TransTexas Gas Corporation (in bankruptcy) |
| TTGN | Tutogen Medical, Inc. |
| TTII | Transportation Technologies, Inc. |