| Colourbox Studio Limited | Faversham | 2018 |
| Colourboxsigns Ltd | Woking | 2015 |
| Colourchoice Upvc Limited | Ramsgate | 2008 |
| Colourco Limited | Halifax | 2002 |
| Colourcraft (Colours & Adhesives) Limited | Sheffield | 1978 |
| Coloured by Ltd | Braintree | 2022 |
| Coloured Screws International Ltd | Blackburn | 2025 |
| Colourfast Financial Ltd | Rayleigh | 2008 |
| Colourfoil Limited | Chelmsford | 1971 |
| Colourful Dove Limited | Fleet | 2013 |
| Colourful Life Ltd | Preston | 2022 |
| Colourful Movements Limited | Salford | 2020 |
| Colourful Outbursts Limited | Reading | 2017 |
| Colourful Thinking Ltd | Lytham St. Anne'S | 2008 |
| Colourhill Ltd | Kirkby In Ashfield | 2014 |
| Colourhouse Masterbatch Limited | Wigan | 2010 |
| Colourhouse Universal Limited | Wigan | 2016 |
| Colouring Surah's Ltd | Bolton | 2026 |
| Colourite Systems Limited | Stafford | 1989 |
| Colourlab Ltd | Fleet | 2006 |
| Colourmaster NIP Limited | Bradford | 2014 |
| Colourmatch Print Ltd | Ilford | 2017 |
| Colourmatched Carpets Limited | Earby | 2021 |
| Colourmix Limited | Birmingham | 2019 |
| Colourmotion Limited | St. Albans | 2016 |
| Colourpak Limited | Stoke On Trent | 2002 |
| Colourpassion Ltd | Southend-On-Sea | 2020 |
| Colourplan Print & Design Limited | Ipswich | 1992 |
| Colourpoint Group Limited | Bourne End | 2021 |
| Colourpoint Litho Limited | Birmingham | 1973 |
| Colourpress Limited | Harrow | 2004 |
| Colours Coffee Ltd | Hullavington | 2024 |
| Colours Dyers (UK) Limited | Leicester | 2010 |
| Colours Media Ltd | Birmingham | 2024 |
| Colours of the Earth Ltd | London | 2023 |
| Colourscreen Teesside Limited | Estate, Stockton-On-Tees | 2008 |
| Colourscript Ltd. | Ilford | 2019 |
| Coloursonic Grand Art Limited | London | 2011 |
| Coloursonic Limited | London | 1998 |
| Colourstream Design and Print Limited | Farnham | 2005 |
| Colourtec Powdercoaters Ltd | Manchester | 2000 |
| Colourtex Limited | Worcester | 2003 |
| Colourtone Powder Coaters Limited | Milton Keynes | 2002 |
| Colouru Ltd | Chester | 2025 |
| Colourview Print Solutions Ltd | Oxford | 2024 |
| Colourway Clothing Limited | Bristol | 2011 |
| Colourwood Ltd | Banbury | 2021 |
| Colourworks DYE House Limited | Leicester | 2019 |
| Colourzz Ltd | Nelson | 2023 |
| Colpa Precision Engineering Limited | Watford | 1946 |
| Colpac Limited | Bedfordshire | 1937 |
| Colpipe Services Ltd | Kilwinning | 2026 |
| Colplan Limited | High Peak | 1994 |
| Colpro Utilis JV Limited | Norwich | 2016 |
| Colsalake Limited | Bingham | 1982 |
| Colsec Limited | Whyteleafe | 1974 |
| Colshaw Aircraft Ltd | Wilmslow | 2025 |
| Colson Trailers Limited | Heanor | 2021 |
| Colson UK Limited | West Bromwich | 2017 |
| Colson X-Cel Limited | Rotherham | 1991 |
| Colstan Profiles Limited | Birmingham | 1991 |
| Colston Bakery Limited | Malvern | 2013 |
| Colston Bath and Spa Private Limited | Hayes | 2015 |
| Colt and Willow Ltd. | Bridport | 2019 |
| Colt DE RAI Meat House Ltd | Slough | 2024 |
| Colt International Limited | Petersfield | 1975 |
| Colt Precision Limited | Tewkesbury | 2014 |
| Colt Press Limited | Milton Keynes | 2007 |
| Colt Stables (2016) Limited | Ashford | 2016 |
| Colt Uncaged Limited | London | 2024 |
| Coltec Tool and Precision Limited | Wolverhampton | 2000 |
| Coltech Precision Engineering Limited | Sheffield | 2010 |
| Colter Products Limited | Estate, Dunmow | 1995 |
| Coltez Limited | Doncaster | 2024 |
| Coltman Precast Concrete Limited | Ibstock | 1971 |
| Colton Concrete Limited | Omagh | 2005 |
| Colton Electrical Equipment Co.Limited | Brentwood | 1937 |
| Colton Signs Ltd | Harrogate | 2019 |
| Colton Tooling Limited | Thurmaston Leicester | 1992 |
| Coltraco Limited | Southsea | 1994 |
| Coltronics Systems Limited | Tamworth | 1986 |
| Colts Electrical Ltd | Stamford | 2021 |
| Columbia Precision Limited | Birmingham | 1982 |
| Columbia Road Clay CIC | London | 2021 |
| Columbia Shipmanagement (UK) Ltd | London | 2023 |
| Columbia Special Processes Limited | Birmingham | 2012 |
| Columbia UK Holdings, Ltd. | Cheltenham | 2022 |
| Columbia-Staver Limited | Wickford | 1974 |
| Columbjohn Limited | Bridport | 2019 |
| Columbus Mckinnon Corporation Limited | Chester | 1958 |
| Columbus Packaging Solutions Limited | Cheltenham | 2021 |
| Columbus Vehicle Wash Recycling Ltd | Darlington | 2016 |
| Column Test Limited | Brentwood | 2006 |
| Columna Protection Ltd | Birmingham | 2024 |
| Coluxor Limited | London | 2022 |
| Colville Interiors Ltd | Hamilton | 2025 |
| Colvin Smith (Pipework) Limited | Newcastle Upon Tyne | 1960 |
| Colway Fabrications Ltd | Leeds | 2022 |
| Colway Security UK Ltd | Leeds | 2011 |
| Colwell Joinery Ltd | Chichester | 2006 |