| ID | Name | Type |
|---|---|---|
| #2124 | CSL Microdata | Z |
| #2125 | CSP Systems | Z |
| #22333 | CSS Electronics | P |
| #2126 | CV Software | Z |
| #2127 | CVM | - |
| #2128 | Cable Interactive Services | Z |
| #2129 | Cable Software | P |
| #2130 | Cabsoft | Z |
| #2131 | Cache | ? |
| #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 |
| #23238 | Calint | P |