| ID | Name | Type |
|---|---|---|
| #2684 | Collins Soft | Z |
| #2685 | Colm A. McCarthy | + |
| #2686 | Colne Robotics Co Ltd | Z |
| #2687 | Colombia Pictures | Z |
| #2688 | Colonel Charisma Team | Z |
| #2689 | Color Magic | ? |
| #2690 | Colorbok | ? |
| #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 |