| Abbreviation | Definition |
|---|---|
| TONS | NovAmerican Steel, Inc. |
| TONS | NovAmerican Steel, Incorporated (de-listed) |
| TONS | NovAmerican Steel, Incorporated (de-listed) |
| TOPP | Topps, Inc. |
| TOPP | Topps, Incorporaetd (de-listed) |
| TOPP | Topps, Incorporaetd (de-listed) |
| TOPSQ | TOP Ships, Incorporated |
| TOPSQ | Tops Appliance City, Inc. |
| TOPZ | Topaz Group, Inc. |
| TOPZ | Topaz Group, Incorporated (de-listed) |
| TOPZ | Topaz Group, Incorporated (de-listed) |
| TORQ | Torque Engineering Company |
| TOTH | Toth Aluminum Corporation |
| TOTL | Total Research Corporation |
| TOUP | Toups Technology Licensing |
| TOUR | Tour C F G, Inc. |
| TOWRQ | Tower Air, Inc. |
| TOXC | Toxic Control Technologies, Inc. |
| TOXC | Toxic Control Technologies, Incorporated (de-listed) |
| TOXC | Toxic Control Technologies, Incorporated (de-listed) |