| ID | Name | Type |
|---|---|---|
| #2132 | Cachondeo Shefwer | ? |
| #2133 | Cacilia Jordan | + |
| #19542 | Cactus | Z |
| #20371 | Cadena SER Valladolid | P |
| #2135 | Cadsoft | Z |
| #2136 | CafePress | Z |
| #21977 | Cajonnostalgia | P |
| #2137 | Calac | ? |
| #2138 | Calculex | ? |
| #17118 | Caldew Business Computer Systems | H |
| #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 |