| ID | Name | Type |
|---|---|---|
| #2278 | Casey Bee Games | Z |
| #17128 | Cash & Carry Computers | H |
| #2279 | Casio | Z |
| #2280 | Casio Computer Co Ltd | Z |
| #2281 | Cass Lewart | ? |
| #2282 | Cassell Ltd | Z |
| #2283 | Cassiopeia | ? |
| #17129 | Castle Computers (Castle Software) | S |
| #17130 | Castle Electronics | H |
| #16008 | Castle House Publications | P |
| #2284 | Castle Software | Z |
| #2285 | Castor Cracking Group | Z |
| #2286 | Casventures Ltd | Z |
| #2287 | Caswell R. Palmer | + |
| #2288 | Cat-Man | - |
| #19033 | Catalunya Radio | P |
| #2289 | Catalyst Coders | P |
| #2290 | Cathedral Software | Z |
| #2291 | Catherine Grant | + |
| #19593 | Cathryn Corns | + |