| Canterbury Window Systems Ltd | Canterbury | 2015 |
| Cantideck | Alton | 2006 |
| Cantileiver Creations Limited | Nottingham | 2017 |
| Cantium Scientific Limited | Thetford | 2003 |
| Canton Roast Ltd | Ashton-Under-Lyne | 2026 |
| Cantor Barnard Ltd | Northamptonshire | 1975 |
| Cantraorent Ltd | London | 2025 |
| Cantronik Ltd | Poole | 2007 |
| Canute Pharma Limited | Altrincham | 2020 |
| Canvalia Ltd | Derby | 2023 |
| Canvas & Oak Interiors Ltd | Rotherham | 2025 |
| Canvas Craft UK Limited | Haywards Heath | 2026 |
| Canvas Distributors Limited | London | 2022 |
| Canvas Elites Limited | London | 2021 |
| Canvas Geeks Ltd | Newcastle Upon Tyne | 2012 |
| Canvas HQ Ltd | Bishop Auckland | 2020 |
| Canvas Landscapes Ltd | Shaftesbury | 2025 |
| Canvas MAN Limited | Shipley | 2004 |
| Canvas Monkey Ltd | Derry | 2021 |
| Canvas Partition Systems Limited | London | 2025 |
| Canvas Studios Ltd | Birmingham | 2025 |
| Canvas Supply Co Ltd | Derry | 2020 |
| Canvas Tattoo Co Ltd | Norwich | 2023 |
| Canvasbox Ltd | London | 2021 |
| Canvasdesignuk Ltd | Darwen | 2026 |
| Canvasprintingco Ltd | Poole | 2024 |
| Canvaswhisper Ltd | Manchester | 2023 |
| Canvin & Catchpole Limited | London | 2017 |
| Canwear Limited | Belfast | 2020 |
| Canyon Europe Limited | Co.Antrim | 1986 |
| Canyon International Limited | London | 2021 |
| Canyon Supplier Limited | London | 2018 |
| Canyouspend Tech Holdings Ltd | Ryde | 2025 |
| Caora Ltd | Isle Of Skye | 2020 |
| Caos Global Ltd | Dudley | 2025 |
| Caoxian Ruiyuan Home Furnishings Co., Ltd. | Gillingham | 2023 |
| CAP & Co Nutra Ltd | Banbury | 2024 |
| CAP Air Systems Limited | St Ives | 2000 |
| CAP Automotive Limited | Coventry | 2023 |
| CAP Coder Limited | Oxford | 1987 |
| CAP Fencing Ltd | Northampton | 2025 |
| CAP Industrial Ltd | Droitwich Spa | 2000 |
| CAP Liners Limited | Halifax | 1966 |
| CAP Sequoia Limited | Birmingham | 2019 |
| Cap-Xx UK Limited | Middleton | 2026 |
| Capability Heath Limited | Newport | 2023 |
| Capable Projects Ltd. | Glasgow | 1997 |
| Capaldis Brora Ltd | Brora | 2017 |
| Capallinn Limited | Loughborough | 2018 |
| Capan Tailor Studio Limited | Rhyl | 2021 |
| Caparo Modular Systems Limited | London | 2006 |
| Capasso Aeronautic Ltd | London | 2025 |
| Capatex Care Ltd | Nottingham | 2019 |
| Capatex Limited | Nottingham | 1995 |
| Capcha Limited | Godalming | 2006 |
| Capchar Ltd | Marlow | 2021 |
| Capco Presswork Limited | London | 1991 |
| Capcon Developments Ltd | Perivale | 2010 |
| Capcrete Ltd | London | 2021 |
| Cape Cctv 101 Ltd | Smethwick | 2019 |
| Cape Cornwall Carpentry Ltd | Penzance | 2026 |
| Cape Enchantment Ltd | Chelmsford | 2023 |
| Cape Europe Limited | Cambridge | 2021 |
| Cape T Ltd | London | 2024 |
| Cape Warwick Ltd | Solihull | 1991 |
| Cape Wrath Distillery Ltd | London | 2024 |
| Capel Salem Corris Ltd | Machynlleth | 2021 |
| Capel's Cabinet Making Limited | Newport Pagnell | 2005 |
| Capell Interiors Ltd | London | 2026 |
| Capella Engineering Services (Leicester) Limited | Melton Mowbray | 2001 |
| Capella Records Limited | Bristol | 2017 |
| Capellino Design Limited | London | 1999 |
| Capemba Fitness Innovations Ltd | London | 2025 |
| Capercaillie Ltd | Dunkeld | 2023 |
| Caperdonich Whisky Limited | Falkirk | 2019 |
| Capere Teamwear Limited | Bury St. Edmunds | 2026 |
| CAPES4MINIFIGS Ltd | Canterbury | 2024 |
| Capestone Farms Limited | Haverfordwest | 2022 |
| Capewell Europe Limited | Swindon | 2021 |
| Capex Procurement Limited | Market Drayton | 2010 |
| Capinna Ltd | Cambridge | 2023 |
| Capita Secure Information Solutions Limited | London | 1981 |
| Capital Air Systems Ltd | Wembley | 2026 |
| Capital Aluminium Extrusions Limited | Wednesbury | 1996 |
| Capital Beds Ltd | Dewsbury | 2019 |
| Capital Belting Limited | Borehamwood | 2015 |
| Capital Bread Ltd | Greenford | 2015 |
| Capital Business Group Limited | London | 2019 |
| Capital Circuits Ltd | Norwich | 2018 |
| Capital Citizens Ltd | London | 2023 |
| Capital Cladding Services Limited | Newport | 2023 |
| Capital Cladding Systems Limited | Newport | 2023 |
| Capital Coated Steel Limited | Newport | 1972 |
| Capital Commercials Ltd | Slough | 2020 |
| Capital Compactors Limited | Droitwich | 2000 |
| Capital Composites Limited | Havant | 2022 |
| Capital Concrete Limited | Canterbury | 2016 |
| Capital Croissant Limited | London | 2024 |
| Capital Cuisine Catering Services Limited | Caerphilly | 2006 |
| Capital Direction Limited | Christchurch | 1993 |