C
- C.K
- CableQuick
- Calex
- Canary
- Capital Valley Plastics Ltd
- Car Mat Co.
- Carlisle Brass
- CarPlan
- Carroll and Meynell Transformers
- Carron Phoenix
- Carysil
- CAT
- CED
- Centek
- Champion
- Charles Bentley
- Cherry Blossom
- Chint
- Cisa
- City Knights
- CK Magma
- ClassicBond
- Clearwater
- ClipGlove
- Coast
- Coba
- Cobra
- Codelocks
- Cofra
- Collingwood
- Colorfill
- Colours
- Colron
- Command
- Conex Banninger B Press
- Conex Banninger B Press Gas
- Contactum
- Cooke and Lewis
- Cookerflex
- Corefix
- Cotswold
- Country Living
- Crabtree
- Cramer
- Creda
- Cromar
- Croydex
- Crystal
- Culina
- Cuprinol
- Curtis Dyna-Fog