| Collective Motion Brewing Company Limited | Bradford | 2020 |
| Collective Support Limited | Witney | 2012 |
| Collectivepaperco Ltd | Chadwell Heath | 2025 |
| Collector Creations Ltd | Derby | 2026 |
| Collector SET Printers Ltd | Medway City Estate Rochester | 1975 |
| Collectors Coffee House Ltd | Godalming | 2022 |
| Collectric Limited | Prenton | 2018 |
| Colledges Butchers Limited | Nottinghamshire | 2003 |
| Colleen Phelan Limited | Birmingham | 2019 |
| College Auto & Motor Care Centre Limited | Stourbridge | 2003 |
| College Autos Limited | Stourbridge | 2011 |
| College Hill Press Limited | London | 1978 |
| Collender Ltd | Quedgeley | 2015 |
| Collet Creations Ltd | Sevenoaks | 2025 |
| Colleton Trading Ltd | Chulmleigh | 2021 |
| Collett Manufacturing Co Limited | Chichester | 2003 |
| Collette Andrew Ltd | York | 2022 |
| Colleum Limited | Middlesbrough | 2019 |
| Colley Limited | Grays | 2023 |
| Collicutt Limited | Southampton | 2019 |
| Colliding Materials Limited | London | 2025 |
| Collie Butchers Ltd | Kemnay | 2020 |
| Collie Print Limited | St. Albans | 2009 |
| Collier & Henry Concrete (Floors) Limited | Maryport | 1993 |
| Collier & Robinson Limited | Newbury | 2019 |
| Collier Campbell Limited | London | 2010 |
| Collier Quarrying and Recycling Limited | Cowdenbeath | 2000 |
| Collier Webb Limited | Eastbourne | 2000 |
| Colliers Cornish Cheese Ltd. | Penryn | 2014 |
| Colliers Truck Builders Limited | Witham | 2000 |
| Colliery Narrow Boat Co. Limited | Northwich | 1981 |
| Collingham Autos Limited | Manchester | 2014 |
| Collington and Co Limited | Helston | 2004 |
| Collingwood Bespoke Play Ltd | Chorley | 2023 |
| Collingwood Boat Builders Ltd | Liverpool | 2003 |
| Collingwood Carpenters and Marine Specialists. Falmouth's Finest Craftsmen. Ltd. | Falmouth | 2018 |
| Collingwood Cymbals Ltd | Bristol | 2019 |
| Collingwood Lighting Limited | Sywell, Northampton | 1967 |
| Collingwood of Somerset Limited | Trowbridge | 2019 |
| Collingwood Property Solutions Limited | Cramlington | 2025 |
| Collingwood Sofas Ltd. | Newcastle Upon Tyne | 2015 |
| Collins & Aikman Automotive Fabrics Limited | London | 1997 |
| Collins & Curtis Masonry Limited | Brentwood | 1999 |
| Collins & Darwell Printers Limited | Leigh | 2012 |
| Collins & Kimpton Limited | Wolverhampton | 1978 |
| Collins (Extrusions) Limited | Bidford On Avon, | 1971 |
| Collins and Hayes Furniture Limited | Melksham | 2017 |
| Collins Bespoke Limited | Ashford | 2014 |
| Collins Chemical Blacking Limited | Carshalton | 2009 |
| Collins Creations 3D Ltd | Truro | 2018 |
| Collins Debden Limited | Guildford | 1986 |
| Collins Engineering Croughton Limited | Brackley | 2003 |
| Collins Executive Cars Limited | Bracknell | 2016 |
| Collins Green Forge Ltd | St. Helens | 2018 |
| Collins Hobby Products Limited | Dorking | 2019 |
| Collins Marine Ltd | Colchester | 2021 |
| Collins Medical Limited | Ashford | 2024 |
| Collins Nets DC Ltd | Dorchester | 2021 |
| Collins Nets Limited | Dorchester | 2003 |
| Collins Performance Engineering Limited | Stoke-On-Trent | 2000 |
| Collins Reinforcements Limited | Dobson Park Way Ince | 1983 |
| Collins Site Services Limited | Chorley | 2012 |
| Collins Systems Services Limited | Biggleswade | 2016 |
| Collins Walker Limited | Cambridge | 1972 |
| Collins Wright Limited | Huddersfield | 2008 |
| Collinson Contracts Limited | Basildon | 2007 |
| Collinson Joinery Construction Ltd | Preston | 2005 |
| Collis Engineering Limited | Alfreton | 1970 |
| Collis Smith Limited | Canvey Island | 1985 |
| Collison Tools Ltd | Newbury | 2026 |
| Collisons Limited | Shipley | 2005 |
| Colloids Limited | Kirkby | 2004 |
| Collyer Consultancy Services Limited | Nottingham | 2019 |
| Collyer Fitted Furniture Ltd | Canvey Island | 2018 |
| Collymoon Craft Limited | Stirling | 2022 |
| Colman A.D. Ltd | Newcastle | 2015 |
| Colmer Fabs Limited | Southampton | 2015 |
| Colmworth Electronics Limited | York | 1991 |
| Coln Trading Ltd | Fairford | 2019 |
| Coln Valley Smokery Limited | Guildford | 1974 |
| Colne Aviation Ltd | Colchester | 2023 |
| Colne Electronics Limited | Halstead | 2008 |
| Colne Sofas Limited | Colne | 2026 |
| Colne Valley Spinning Company Limited | Huddersfield | 1962 |
| Colnewater Ltd | Colne | 2011 |
| Colo Limited | High Wycombe | 2026 |
| Cologne Strip Ltd | Paisley | 2026 |
| Colomba Giacomini Bespoke Ltd | London | 2025 |
| Colombia Roasteries Limited | Preston | 2020 |
| Colombian Cacao Premium Ltd | Enfield | 2024 |
| Colombian Connection Ltd | Sunderland | 2026 |
| Colombian Speciality Coffees Ltd. | London | 2023 |
| Colombier (UK) Limited | Sittingbourne | 1968 |
| Colomer Munmany Europe Company Ltd | Dalton | 2012 |
| Colonial One Ltd | London | 2008 |
| Colonial Windows Limited | Cradley Heath | 2003 |
| Colonial World Foods (UK) Limited | Westcliff-On-Sea | 2003 |
| Colonie Limited | London | 2025 |
| Colonsay Beverages Ltd. | Isle Of Colonsay | 2015 |
| Colony Productions Ltd | Cobham | 2023 |