C
- C.K
- CableQuick
- Capital Valley Plastics Ltd
- Carlisle Brass
- CarPlan
- Carrara and Matta
- Carroll and Meynell
- Carron Phoenix
- Cascade
- Cassellie
- CAT
- CED
- Centurion
- Cherry Blossom
- Chocbox
- Cisa
- City Knights
- CK Magma
- Claber
- Coast
- Coba Europe
- Codelocks
- Collingwood
- Colorfill
- Colours
- Command
- Cooke and Lewis
- Cookerflex
- Corefix
- Crabtree
- Creda
- Cromar
- Croydex
- Cuprinol
- Cutter
- Cygnet