| Catervent Limited | Blackburn | 2014 |
| Caterwise Limited | Crediton | 2026 |
| Caterzone Ltd | Northampton | 2017 |
| Catford Rhum Arrange Ltd | Chesham | 2021 |
| Catgb.Com Limited | Liverpool | 2022 |
| Catgm Global Ltd | Croydon | 2026 |
| Cath Collins Devon Ltd | London | 2010 |
| Cath DRY Global (UK) Ltd | London | 2021 |
| Cath Gallagher Binding Ltd | Glasgow | 2021 |
| Cathal Kelly Limited | Londonderry | 2022 |
| Catharsis Manufacturing Ltd | Peterborough | 2022 |
| Cathartic Scents Ltd | Stanmore | 2022 |
| Cathcart Contracts Ltd | Enniskillen | 2018 |
| Cathcarts Kitchen Ltd | Magherafelt | 2023 |
| Cathedral Coffins Limited | Houghton Le Spring | 2001 |
| Cathedral Glass Ltd | Poulton-Le-Fylde | 2004 |
| Cathedral Graphics Ltd | Belfast | 2009 |
| Cathedral Print Ltd | Belfast | 2023 |
| Cathedral Shutters and Blinds Ltd | Darlington | 2014 |
| Cathedral Stone Masons Limited | Martock | 2003 |
| Cathelco Limited | Chesterfield | 1956 |
| Cathem Limited | Blackburn | 2009 |
| Catherine Blades Bridal Ltd. | Tadley | 2011 |
| Catherine Conaty Soft Furnishings Ltd | Birmingham | 2018 |
| Catherine DE Crevecoeur Ltd | Tunbridge Wells | 2023 |
| Catherine Group Ltd | Coventry | 2022 |
| Catherine Walker Limited | | 2002 |
| Cathexis Europe Limited | Sandiacre | 2007 |
| Cathodic Protection and Corrosion Control Company Ltd | Crewe | 2018 |
| Cathodic Protection Co. Limited | Grantham | 1950 |
| Cathodic Protection Engineering Limited | Birmingham | 2013 |
| Cathro Compressors Limited | Newcastle | 2003 |
| Caths Creations Ltd | Alexandria | 2021 |
| Cathy Sutherland Jewellery Ltd | Doncaster | 2025 |
| Cathy's Creative Company Ltd | London | 2026 |
| Catley Technologies Limited | Leighton Buzzard | 2017 |
| Catling Bakery Ltd | Cramlington | 2017 |
| Catman Fudge Limited | London | 2025 |
| Catmint Components Ltd | Northallerton | 2021 |
| Catnams Limited | South Croydon | 2004 |
| Caton Limited | Coventry | 2022 |
| Caton Projects Limited | Blaby | 2010 |
| Catra Selection Limited | London | 2026 |
| Cats & Co Limited | Gainsborough | 2014 |
| Cats and Dust Limited | Leyland | 2021 |
| Catscat Limited | Westcliff On Sea | 2020 |
| Catt Composites Limited | Nottingham | 2015 |
| Cattani Limited | Ely | 2023 |
| Catterall & Wood Limited | Chorley | 1974 |
| Cattermole Group Ltd | Derby | 2017 |
| Catterwood Limited | Glasgow | 2023 |
| Cattleman Foods Ltd | Aylesbury | 2025 |
| Catto Catto Ltd | London | 2020 |
| Catton Cables Limited | Birmingham | 2015 |
| Catton Control Cables Limited | Birmingham | 1958 |
| Catton Home Improvements Ltd | Norwich | 2012 |
| Catton Print Limited | Norwich | 2002 |
| Cattron UK Limited | Bristol | 1970 |
| Cattspaw Limited | St Austell | 2003 |
| Cattyum Limited | Chester | 2023 |
| Caturix Ltd | London | 2019 |
| Catwalk Coffee Ltd | London | 2026 |
| Catwalk Collection Handbags Ltd | Crewe | 2005 |
| Catwalk Outfit Ltd | London | 2020 |
| Catzpublications Limited | London | 2013 |
| Cat’Ox Limited | London | 2022 |
| Caucus Connect Limited | Birmingham | 2018 |
| Caucus Innovation Limited | Birmingham | 2015 |
| Caudwell Marine Limited | Stafford | 2018 |
| Caught & Cured Limited | Gloucestershire | 2011 |
| Cauldron Foods Limited | Stokesley | 1982 |
| Caulfield Composites Ltd | Strabane | 2021 |
| Cauli Creative Ltd Trading AS Baked by Christie Ltd | Solihull | 2020 |
| Cauliflower Group Limited | Farnham | 2007 |
| Caunce Sawmills Limited | Burscough | 2003 |
| Caunton Access Limited | Shirebrook | 2007 |
| Caunton Engineering Limited | Nottingham | 1969 |
| Caupenne Ltd | Rochester | 2020 |
| Caura Ltd | London | 2018 |
| Causeway Artisan Foods Ltd | Portrush | 2020 |
| Causeway Carpentry Limited | Hailsham | 2016 |
| Causeway Carpets Limited | Manchester | 1982 |
| Causeway Chemicals Ltd | Belfast | 2022 |
| Causeway Country Sports Ltd | Rayleigh | 2021 |
| Causeway Joinery Limited | Tunbridge Wells | 2002 |
| Causeway Plant Limited | Haverfordwest | 2012 |
| Causeway Publishing Limited | Ballymoney | 2012 |
| Causeway Sensors Limited | Belfast | 2013 |
| Causeway Sensory Global Ltd | Londonderry | 2021 |
| Causeway Steel Products Limited | Chatham | 2002 |
| Causis Group Ltd | Bromley | 2021 |
| Cauthery Reid Industries Limited | Rochdale | 2002 |
| CAV Advanced Technologies Limited | Consett | 2008 |
| CAV Aircraft Services Ltd | Southampton | 2013 |
| CAV Films Limited | Hove | 2001 |
| CAV Ice Protection Limited | Consett | 2008 |
| CAV Joinery Ltd | Sheffield | 2022 |
| Cava Racing Ltd | Bridgwater | 2026 |
| Cava Technical UK Ltd | Peterborough | 2025 |
| Cavachi Enterprises Limited | Worcester | 2013 |