| ID | Name | Type |
|---|---|---|
| #2540 | Cinematronics Inc | Z |
| #2541 | Cinemaware | Z |
| #2542 | Cinisello Balsamo | ? |
| #2543 | Cinto Ventura | ? |
| #20392 | Cinzia d''Ascenzo | + |
| #2544 | Circuit Design | Z |
| #2545 | Circulo de Soft | Z |
| #2546 | Ciriaco Ozquiaga Zardoya | ? |
| #2547 | Ciril Krasevec | + |
| #2548 | Cirkul | ? |
| #18548 | Ciruelo Cabral | + |
| #2549 | Citadel Products | Z |
| #17139 | Citisoft | R |
| #2550 | Citizen Software | Z |
| #2551 | CityAceE | ? |
| #2552 | Ciudadela Software | Z |
| #2553 | Cj Echo | - |
| #2554 | Cj.Le0 | ? |
| #19648 | Ckazka Entertainment | P |
| #17140 | Claire's Computers | S |