| ID | Name | Type |
|---|---|---|
| #2691 | Colorsoft Audiovisual | ? |
| #2692 | Colossoft Research | Z |
| #2693 | Colourmatic Computing | Z |
| #2694 | Columbia TriStar Pictures | Z |
| #2695 | ComTec | Z |
| #2696 | Coma Software | Z |
| #2697 | Comedia | ? |
| #2698 | Comet | ? |
| #2699 | Comet Software | Z |
| #2700 | Comix | Z |
| #2701 | Command Software | Z |
| #2702 | Commax | ? |
| #2703 | Commodore Plus | Z |
| #2704 | Commotion | ? |
| #2705 | CompUtopia | Z |
| #16673 | Compac | Z |
| #2706 | Compact Yellowbill | Z |
| #2707 | Companion Software | Z |
| #2708 | Compass Software | P |
| #2709 | Compiler Software | Z |