| Colecraft Engineering Limited | Southam | 1974 |
| Colecraft Widebeam Boats Limited | Rugby | 2013 |
| Coleford Hydraulics & Machinery Services Ltd | Coleford | 2025 |
| Coleherne Limited | Hyde | 1905 |
| Colehill Kitchen Ltd | Weybridge | 2017 |
| Colehillcustoms Ltd | Wimborne | 2023 |
| Coleman Baines Limited | West Midlands | 2021 |
| Coleman Coffee Roasters Limited | Builth Wells | 2015 |
| Coleman Design Ltd | Manningtree | 2011 |
| Coleman-Hilsdon Limited | Oxford | 2023 |
| Colemans Kitchens & Bedrooms Limited | Nottinghamshire | 2003 |
| Colemans Steel Ltd | Leeds | 2021 |
| Coleman’S Cooking Ltd | Warrington | 2020 |
| Colemoi UK Ltd | London | 2020 |
| Colenso Ventures Limited | Cirencester | 2018 |
| Coler Supply Solutions (Intl) Ltd | Atherstone | 2009 |
| Coleraine Fireplaces Limited | | 2003 |
| Coles Agri Services Ltd | Kidderminster | 2020 |
| Coles Contracts Limited | Croydon | 2015 |
| Coles Electrical Services Ltd | Weston-Super-Mare | 2015 |
| Coles Electroacoustics Limited | Herts | 1974 |
| Coles Precision Engineering Ltd | Bedford | 2025 |
| Coles Steel Fabricators Limited | Lowestoft | 2016 |
| Coleshill Aluminium Limited | Birmingham | 1957 |
| Coleshill Plastics Group Limited | Coventry | 2009 |
| Coleshill Plastics Limited | Coventry | 1991 |
| Coleshill Solar Limited | Coventry | 2009 |
| Coleshill Windows & Doors Ltd | Solihull | 2014 |
| Coleslaw 232 Limited | London | 1993 |
| Coleston Mining Limited | Glasgow | 1985 |
| Colette Creations Ltd | Altrincham | 2020 |
| Colette Ltd | West Malling | 2021 |
| Colex International Limited | Glenfield | 1991 |
| Coley Manufacturing Ltd | Bishop Auckland | 2025 |
| Coleys Brewery Limited | Rochdale | 2025 |
| Colfield Engineering Limited | | 1982 |
| Colgrace Ltd | Birmingham | 2025 |
| Colhoun Scaffolding Services Limited | Co Tyrone | 2006 |
| Colian UK Limited | Bristol | 1999 |
| Colibri Sign & Print Ltd | London | 2020 |
| Colin Davenport Limited | Stafford | 1988 |
| Colin Davies Cabinet Makers Ltd | Wrexham | 2022 |
| Colin Engineers Ltd | Romford | 2014 |
| Colin Ford Bespoke Joinery Limited | Richmond | 2005 |
| Colin Fraser Limited | Aberdeen | 2002 |
| Colin Freeman Furniture Limited | Bridgwater | 2002 |
| Colin G Berry Carpenters and Joiners Ltd | Aberdeen | 2012 |
| Colin H. Hellier Limited | Brentwood | 1992 |
| Colin Hammond Industries Ltd | Chipping Campden | 1998 |
| Colin Hancock Milking Machines Ltd | Goodwick | 2008 |
| Colin Harry Fletcher Limited | Falmouth | 2024 |
| Colin Hood Auto Electrical Limited | Wakefield | 2011 |
| Colin Joseph Designs Limited | Burscough | 2024 |
| Colin Layzell Cabinetmakers Ltd | Cullompton | 2023 |
| Colin Marshall & SON Limited | Fakenham | 2008 |
| Colin Mcdonald Appliance Repairs Ltd | Dunbar | 2016 |
| Colin Mcknight Limited | Airdrie | 2026 |
| Colin Mear Engineering Limited | Maidenhead | 1982 |
| Colin Mear Limited | Maidenhead | 2010 |
| Colin Parker (Masonry) Limited | Spalding | 1975 |
| Colin Parker Furniture Limited | Newbridge | 2018 |
| Colin Reid Bespoke Furniture Ltd | Nottingham | 2021 |
| Colin Robinson Printers Limited | Caerphilly | 1976 |
| Colin Russell Sheet Metal Limited | Mossley | 2003 |
| Colin Walker Composites Ltd | Portsmouth | 2017 |
| Colin Weightman Services Limited | Grantham | 2002 |
| Colin Wellings HGV Driving. Ltd | Tewkesbury | 2018 |
| Colinear Acoustics Ltd | Fort William | 2024 |
| Colinette Yarns Limited | Southampton | 1988 |
| Colinton Manufacturing Limited | Grangemouth | 1985 |
| Colinwell Masonry Products Limited | Belfast | 2021 |
| Coliseum Trading Company Ltd. | Whitby | 1999 |
| Coll GEN Limited | London | 2012 |
| Collabio Collaborative Healthcare (UK Holdings) Limited | London | 2024 |
| Collaboration Spirits Ltd | Newcastle Upon Tyne | 2023 |
| Collaborative CA Services Limited | London | 2019 |
| Collaborative Design and Build Limited | London | 2015 |
| Collaborative Robotics Limited | Cleator Moor | 2020 |
| Collage Media Production Ltd | Brighton | 2022 |
| Collage Sounds Ltd | London | 2023 |
| Collagen Factory Ltd | London | 2025 |
| Collagen Solutions (UK) Limited | London | 2013 |
| Collanature Ltd | Felixstowe | 2025 |
| Collar Craft Ltd | Yeovil | 2021 |
| Collar UP Aviation Limited | London | 2025 |
| Collard Ready MIX Limited | Hook | 2024 |
| Collard Repro Limited | Telford | 1991 |
| Collards Caravan & Motorhome Services Ltd | Bristol | 2024 |
| Collards Carpentry Limited | Guildford | 2024 |
| Collards Distillery Limited | Builth Wells | 2017 |
| Collblanc Ltd | Weybridge | 2024 |
| Collbycom Ltd | London | 2021 |
| Colleague Box Limited | Derby | 2014 |
| Collect and Collaborate Ltd | London | 2024 |
| Collect Four Limited | London | 2025 |
| Collectin Ltd | London | 2018 |
| Collecting Gains Limited | London | 2025 |
| Collections Foamextra Limited | Glasgow | 2013 |
| Collective Dynamics Limited | Woodford Green | 2014 |
| Collective Engineering Ltd | Leeds | 2026 |