| Cartilage Repair Systems Ltd | Kingston Upon Thames | 2019 |
| Cartin Engineering Limited | Omagh | 2016 |
| Cartlidge Carpentry Ltd | Crewe | 2021 |
| Cartman Access Solutions Ltd | Middlesbrough | 2026 |
| Cartman Electrical Engineers Limited | Durham | 2025 |
| Cartmel Distillers Limited | Rushden | 2005 |
| Cartmel Sticky Toffee Pudding Co. Ltd. | Grange-Over-Sands | 2000 |
| Cartmore Pallets Glasgow Ltd | Kirkcaldy | 2023 |
| Cartografie Limited | London | 2020 |
| Carton DIE (NI) Limited | Newry | 2003 |
| Carton Edge Limited | Northampton | 1991 |
| Carton Finish Limited | Batley | 2020 |
| Carton Handling Solutions Limited | Salisbury | 2012 |
| Carton Packaging 2020 Ltd | Ongar | 2017 |
| Carton Window Films Limited | Hinckley | 2013 |
| Carton-Pro Ltd | Peterborough | 2010 |
| Cartonage Limited | Leeds | 2006 |
| Cartonnex Limited | Cheltenham | 2025 |
| Cartor Security Print Group Limited | Wolverhampton | 2004 |
| Cartor Security Printers Limited | Wolverhampton | 1966 |
| Cartouche UK London Limited | Hertford | 2006 |
| Cartridge Care Ltd | Manchester | 2013 |
| Cartridge World (Tufnell Park) Ltd | London | 2003 |
| Cartronics GB Limited | Surrey | 2003 |
| Cartronix Cluster Repairs Limited | Waterlooville | 2016 |
| Cartwheel Coffee Roasters Ltd | Nottingham | 2020 |
| Cartwheel UK Limited | Chesham | 2005 |
| Cartwright Arch Frames Limited | Birmingham | 2012 |
| Cartwright Aviation Services Ltd | Nuneaton | 2026 |
| Cartwright Carpentry Solutions Limited | Leicester | 2014 |
| Cartwright Commercial Refrigeration Ltd | Warrington | 2012 |
| Cartwright Engineering Limited | Cleethorpes | 2023 |
| Cartwright Property Worx Ltd | Blandford Forum | 2024 |
| Cartwright Vehicle Conversions International Limited | Sheffield | 2020 |
| Cartwright Vehicle Conversions Limited | Sheffield | 2020 |
| Carty's Bakery Ltd | Edinburgh | 2018 |
| Caru Campers Ltd | Cardiff | 2022 |
| Caruanair Ltd | Barry | 2019 |
| Caruso Kitchen Limited | Margate | 2015 |
| Carva Food Ltd | Woodhall Spa | 2026 |
| Carvalet Zamfir Ltd | Barking | 2017 |
| Carvansons Ltd | Rossendale | 2013 |
| Carve Coffee Roasters Ltd | Swanage | 2020 |
| Carve Creations Limited | Redditch | 2017 |
| Carve Home Ltd | Cardiff | 2024 |
| Carve Smart Pro Ltd | Haverfordwest | 2025 |
| Carved at the Castle Ltd | Larne | 2021 |
| Carved London Ltd | London | 2026 |
| Carved Parfums Limited | London | 2023 |
| Carver & Co (Engineers) Limited | Walsall | 1994 |
| Carver Engineering Access & Safety Solutions Limited | Doncaster | 2013 |
| Carver Engineering Services Limited | Doncaster | 2005 |
| Carver International Limited | Walsall | 1944 |
| Carver Ltd | London | 2021 |
| Carver Rewind Services Limited | Halesowen | 2009 |
| Carvero Limited | Leicester | 2006 |
| Carvetii Coffee Limited | Wigton | 2011 |
| Carving Campers Ltd | Blackburn | 2020 |
| Carving Consulting Limited | Woking | 2025 |
| Carving Futures C.I.C. | Ashford | 2023 |
| Carvision Creators Ltd | Birmingham | 2023 |
| Carvoa Ltd | Rugby | 2025 |
| Carvys Technology Ltd | Telford | 2021 |
| Carwardine Espresso Machine Solutions Limited | Bristol | 2016 |
| Carwen List Limited | London | 2025 |
| Carwin Industry Co., Ltd | Gillingham | 2022 |
| Carwood BDS Limited | Coventry | 2010 |
| Carwood Motor Units Limited | Coventry | 1949 |
| Cary Motor Services Limited | Castle Cary | 2014 |
| Carysil Surfaces Ltd | Alfreton | 1986 |
| Carzel Limited | Cobham | 2017 |
| CAS 2012 Limited | Birmingham | 1998 |
| CAS Aviation Services Limited | Bridgwater | 2006 |
| CAS Building Supplies Limited | London | 2026 |
| CAS Electronics Limited | Ipswich | 2002 |
| CAS Engineering (Northallerton) Limited | Northallerton | 2005 |
| CAS Mechanical Limited | Sunderland | 2024 |
| CAS PAR CAS Scotland Ltd | Edinburgh | 2016 |
| Cas-Uk Ltd | Ashford | 2026 |
| Casa Amore Ltd | Birmingham | 2026 |
| Casa Angelina Ltd | Edinburgh | 2013 |
| Casa Aromea Ltd | London | 2026 |
| Casa Bake Ltd | Nottingham | 2026 |
| Casa Bamboo Ltd | Leicester | 2023 |
| Casa Banana Ltd | East Grinstead | 2026 |
| Casa Bella Furnishings Limited | Blackburn | 2006 |
| Casa DE BO Ltd | Hemel Hempstead | 2025 |
| Casa DE LA Pasta Ltd | Edinburgh | 2026 |
| Casa DE Lumas Ltd | London | 2025 |
| Casa DEL Duende Ltd | Weymouth | 2013 |
| Casa DI Gelato Ltd | Dundee | 2019 |
| Casa DI Luxe Ltd | Leeds | 2026 |
| Casa DI Ovia Ltd | London | 2025 |
| Casa DI Santo Limited | Brentford | 2016 |
| Casa Dina Limited | London | 2025 |
| Casa DIO Holding Limited | London | 2019 |
| Casa Divertente Limited | Bury St Edmunds | 2017 |
| Casa Fashion Ltd | Great Barr | 2023 |
| Casa Ferrini Limited | Hungerford | 2025 |
| Casa Global Ltd. | London | 2017 |