| ID | Name | Type |
|---|---|---|
| #14545 | Thor Computer Software | P |
| #14546 | Thoralf Klatt | + |
| #23148 | Thorlinvhoo | P |
| #14547 | Thorn EMI Computer Software | Z |
| #14548 | Thorn EMI Ferguson Ltd | Z |
| #14549 | Thorn EMI Video Ltd | P |
| #22380 | Thorsten Gorba | + |
| #17823 | Thoughts & Crosses | A |
| #14550 | Threlfall & Hodgson | Z |
| #14551 | Thresher Group | Z |
| #14552 | Thrydhent Vision Systems | Z |
| #14553 | Thunder | ? |
| #14554 | ThunderWare Research Center | Z |
| #14555 | Thundersoft | Z |
| #19227 | Thunderstorm Software | P |
| #14556 | Thunderteam | Z |
| #19495 | Thunor | + |
| #14557 | Thurnall Electronics Ltd | Z |
| #14558 | Thurstan Felstead | + |
| #23049 | Thøger Lyme | + |