| ID | Name | Type |
|---|---|---|
| #2139 | Caliph | ? |
| #2140 | Calisto | Z |
| #2141 | Calisto Software Ltd | P |
| #2142 | Callum Gibson | ? |
| #2143 | Calpac Computer Software | P |
| #22960 | Calvin Reid | + |
| #2144 | Cam | ? |
| #2145 | Cambic Software | Z |
| #17962 | Cambridge Computer | Z |
| #17119 | Cambridge Computer Store | H |
| #2146 | Cambridge Computing Research Ltd | H |
| #15796 | Cambridge Learning | Z |
| #2147 | Cambridge Micro Software | Z |
| #2148 | Cambridge Microcomputer Centre | Z |
| #2149 | Cambridge Microelectronics | Z |
| #2150 | Cambridge Research | Z |
| #2151 | Cambridge University Press | Z |
| #2152 | Camden Council | Z |
| #2153 | Camel Micros | ? |
| #2155 | Camel Products | P |