| Abbreviation | Definition |
|---|---|
| TECH | Techne Corporation |
| TECUA | Tecumseh Products Company Class A |
| TECUB | Tecumseh Products Company Class B |
| TEDBN | Toledo Edison Company |
| TEHI | True Health, Inc. |
| TEHI | True Health, Incorporated (de-listed) |
| TEHI | True Health, Incorporated (de-listed) |
| TEIM | Tridon Enterprises Corporation |
| TEIM | Tridon Enterprises Corporation (de-listed) |
| TEIM | Tridon Enterprises Corporation (de-listed) |
| TEKC | Teknowledge Corporation |
| TEKI | TEK Digitel Corporation |
| TEKS | Tekinsight.Com, Inc. |
| TEKS | Tekinsight.Com, Incorporated (de-listed) |
| TEKS | Tekinsight.Com, Incorporated (de-listed) |
| TEKSW | Tekinsight.com, Inc. Warrants |
| TEKSW | Tekinsight.com, Incorporated Warrants (de-listed) |
| TEKSW | Tekinsight.com, Incorporated Warrants (de-listed) |
| TELCE | T C C Industries, Inc. |
| TELCE | TCC Industries, Incorporated (de-listed) |