| ID | Name | Type |
|---|---|---|
| #2271 | Carrick Tomson | + |
| #18961 | Carrier Bag Software | P |
| #17127 | Carringtons Computer Centre | H |
| #2272 | Carrium Software | Z |
| #2273 | Carter Follis Software Associates | Z |
| #2274 | Cartoon Time | Z |
| #19621 | Caryn Gough | + |
| #2275 | Cascade Games Ltd | P |
| #2276 | Cascaismicro | ? |
| #2277 | Cases Computer Simulations Ltd | P |
| #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 |