| Coffeehouse Investments Limited | Banbury | 2024 |
| Coffeeland Limited | Portsmouth | 2001 |
| Coffey Contractors Limited | Middlesex | 2004 |
| Coffey Property Ltd | Colchester | 2023 |
| Cofi Limited | Market Drayton Shropshire | 1992 |
| Coform Limited | Pontypridd | 2013 |
| Coformni Limited | Antrim | 2023 |
| Cofton 1959 Limited | Birmingham | 2014 |
| Cogan Car Co.Limited | | 1965 |
| Cogap (Middle East) Limited | London | 2007 |
| Cogen Consulting Ltd | Hailsham | 2013 |
| Cogent Business Solutions Limited | Ferndown | 2008 |
| Cogent IDS Limited | Crayford | 2019 |
| Cogent Limited | Crayford | 2019 |
| Cogent Mind Limited | Otley | 2023 |
| Cogent Operational Services Limited | Wakefield | 2022 |
| Coghlan Corporation Ltd | London | 2014 |
| Coghlan Holdings Limited | Newport | 2019 |
| Cogito Holdings Limited | London | 2017 |
| Cognioso Limited | Huddersfield | 2026 |
| Cognis Performance Chemicals UK Limited | Cheadle | 1999 |
| Cognisance Psychology Ltd | London | 2022 |
| Cognita Reply Limited | London | 2025 |
| Cognita UK Mexico Holdings Limited | Milton Keynes | 2010 |
| Cognition Land and Water Trustee Limited | Oxted | 2021 |
| Cognitionlife Ltd | London | 2022 |
| Cognitious Ltd | Leighton Buzzard | 2015 |
| Cognitive Functional Therapy Ltd | Edinburgh | 2014 |
| Cognitu Technology Services Ltd | London | 2002 |
| Cognoisette Limited | Long Eaton | 2002 |
| Cogs Management Services Limited | Epsom | 1992 |
| Cogsmith Limited | Stockport | 2016 |
| Cohen Cramer Limited | Leeds | 2013 |
| Cohen Holdings Limited | London | 2016 |
| Cohenit Limited | Edinburgh | 2018 |
| Cohesion Marketing UK Ltd | Southampton | 2025 |
| Cohesion Studios Limited | Stratford Upon Avon | 2022 |
| Cohesive Communications Limited | Newport | 1998 |
| Cohlord Limited | Newport | 2010 |
| Cohousing for ALL Community Interest Company | Harrow | 2024 |
| Coif Nominees (UK) Two Limited | London | 2025 |
| Coif Nominees Limited | | 1963 |
| Coign IT Solutions Ltd | Chatteris | 2011 |
| Coil Equipment Warehouse Limited | Wakefield | 1988 |
| Coin Dreams Limited | London | 2025 |
| Coincidence Ltd | London | 2023 |
| Coinetec Limited | Congleton | 2023 |
| Cokelife International Trading Co., Ltd | Beckenham | 2021 |
| Col's Campers Ltd. | Southampton | 2024 |
| Col-Mac Limited | Co Tyrone | 2003 |
| COL1N Limited | Harrogate | 2018 |
| Cola COE Limited | Hartlepool | 2007 |
| Colab Brands Ltd | Manchester | 2024 |
| Colab Developments Ltd | Guisborough | 2017 |
| Colaso Technology Co., Ltd | Beckenham | 2018 |
| Colburn Estates Ltd | Swindon | 2013 |
| Colburn Management Company Limited | York | 1988 |
| Colby Capital Limited | Ashford | 2010 |
| Colchester Bearings Limited | Colchester | 1983 |
| Colchester Dock Transit Company Limited | London | 1924 |
| Colchester Glass Ltd | Maldon | 2025 |
| Colchester Hotel Ltd | Colchester | 2021 |
| Colchester Plant Hire Limited | Colchester | 2009 |
| Colchester Road 1958 Limited | Portsmouth | 2014 |
| Colchester Road 1960 Limited | Portsmouth | 2014 |
| Colchester Tillage Limited | Essex | 1949 |
| Colchester Windows Ltd | Colchester | 2024 |
| Colcoy Limited | 80 Upper Street | 1990 |
| Cold 2 Sold Limited | Clydebank | 2009 |
| Cold Case Planning Limited | Bristol | 2011 |
| Cold Control Group Limited | Alresford | 2026 |
| Cold JET Ltd | London | 2014 |
| Cold River Ltd | London | 2021 |
| Cold Store Maintenance Ltd. | Gloucester | 1964 |
| Coldborough Park Estate Limited | Horsham | 2014 |
| Coldfield Consultants Limited | Barking | 2014 |
| Coldpark 2 Limited | London | 2020 |
| Coldpark Limited | London | 2007 |
| Coldstar Air Conditioning Ltd | Grimsby | 2020 |
| Coldstar Group Ltd | Grimsby | 2020 |
| Coldwater Seafood (UK) Limited | Huntingdon | 1996 |
| Coldweld Limited | Ashford | 2000 |
| Cole & Lewis Limited | London | 2006 |
| Cole Brothers Ltd | Sheffield | 2021 |
| Cole Builders (Swansea) Limited | Swansea | 2010 |
| Cole Clark Projects Limited | Stockport | 2020 |
| Cole EQ Limited | Newark | 2021 |
| Cole Wealleans-Watts Limited | Cramlington | 2022 |
| Colebrand Limited | London | 2003 |
| Colebrooke Management Limited | Stanmore | 1996 |
| Coledale Estates Limited | Penrith | 2022 |
| Colegrave Seeds Limited | Banbury | 2001 |
| Coleman & Company Plant Hire Limited | Birmingham | 2011 |
| Coleman 1967 Limited | Telford | 2014 |
| Coleman Douglas Pearls Limited | London | 2023 |
| Coleman Property Management Limited | Newport | 2004 |
| Coleman Roofing Supplies Limited | Sheffield | 1969 |
| Coleman's Holdings Ltd | St Leonards On Sea | 2024 |
| Colemans Fireproof Depository RTM Company Limited | Liverpool | 2021 |
| Colenso Apartments Limited | Belfast | 1982 |