| Abbreviation | Definition |
|---|---|
| TRIC | Tri County Bancorp, Incorporated (de-listed) |
| TRID | Trident Microsystems, Inc. |
| TRID | Trident Microsystems, Incorporated (de-listed) |
| TRIH | Triad Hospitals, Inc. |
| TRIH | Triad Hospitals, Incorporated (de-listed) |
| TRIH | Triad Hospitals, Incorporated (de-listed) |
| TRII | ranscrypt International |
| TRII | Transcrypt International |
| TRIL | Tri- Valley Corporation |
| TRIM | Trimfast Group, Inc. |
| TRIT | Trident Telecom, Inc. |
| TRKN | Trikon Technologies, Inc. |
| TRKR | Tracker Corporation of America |
| TRMB | Trimble Navigation, LTD. |
| TRMK | Trustmark Corporation |
| TRMM | T R M Corporation |
| TRMS | Trimeris, Inc. |
| TRND | Trend Lines, Inc. |
| TRNI | Trans Industries, Inc. |
| TRNN | Torent, Inc. |