| ID | Name | Type |
|---|---|---|
| #2915 | Cyberex | ? |
| #2916 | Cybernetic Applications Ltd | P |
| #20483 | Cybernetic Soft | P |
| #2917 | Cyberprog New Media | Z |
| #2918 | Cybexlab Software | Z |
| #2919 | Cyborg | ? |
| #2920 | Cyclone | Z |
| #19303 | Cygnus | - |
| #2921 | Cygnus Software | Z |
| #17202 | Cygnus Two Computer Games | S |
| #18235 | Cymon's Games | ? |
| #2922 | Cyningstan | ? |
| #2923 | Cyrehl Owl | ? |
| #20559 | Cyril Dufer | + |
| #2924 | Czerweny Electronica S.A.I.C. | Z |
| #2925 | Czes Kosniowski | + |
| #20885 | Cândido Manuel Pereira | + |
| #20384 | César Martinez-Barbosa | + |
| #22870 | Códice Soft | P |
| #20126 | D Pashley | + |