| Carsandvansdirect Limited | Gateshead | 2017 |
| Carshare Parking Limited | York | 2009 |
| Carson Builders N.I Ltd | Belfast | 2019 |
| Carson Group Ltd | Carryduff | 2007 |
| Carson Office Suites Ltd. | West Lothian | 2010 |
| Carston ETL Limited | Cardiff | 2024 |
| Carswell Golf Club Limited | Witney | 1992 |
| Carta Law Limited | St. Albans | 2026 |
| Cartaplan Systems Limited | Herne Bay | 2012 |
| Cartel Security Limited | Romford | 2002 |
| Cartel Security Systems Limited | Romford | 2012 |
| Cartem Limited | Leicester | 2006 |
| Cartenager Limited | Hastings | 2006 |
| Carter & Miller Limited | Market Rasen | 2026 |
| Carter Building Engineering Services Limited | Birmingham | 1959 |
| Carter Construction Limited | Cheltenham | 2004 |
| Carter Environmental Engineers Limited | Birmingham | 1909 |
| Carter Jonas Limited | London | 2007 |
| Carter Lauren Construction (Holdings) Limited | Cardiff | 2018 |
| Carter Machinery International Co., Ltd | London | 2020 |
| Carter Planned Maintenance Limited | Birmingham | 1983 |
| Carter Reeves Limited | London | 2012 |
| Carter Refrigeration & Retail Services Limited | Birmingham | 2003 |
| Carter Research, Change and Development Ltd | Edinburgh | 2012 |
| Carter Riley Construction Limited | Farnworth | 2016 |
| Carter Security Solutions Limited | Wisbech | 2023 |
| Carter Street Management Company Limited | Uttoxeter | 2012 |
| Carter Swan Limited | Harrogate | 2025 |
| Carterfilms Ltd | Dunstable | 2021 |
| Carters Event Services CYF | Llangollen | 2022 |
| Carters Steam Fair Limited | London | 2009 |
| Carterton Vets Ltd | Bristol | 2017 |
| Cartesian Group Ltd | Leicester | 2026 |
| Cartier Classics Limited | Harrogate | 2011 |
| Cartils Limited | London | 2018 |
| Cartimonds Limited | Margate | 2023 |
| Cartmel Care Homes Ltd | London | 2008 |
| Cartmell 1956 Limited | Lytham St. Annes | 2014 |
| Cartmell Road 1957 Limited | Lytham St. Annes | 2014 |
| Cartner Defreitas Limited | Carlisle | 2005 |
| Cartographica Press Limited | London | 1981 |
| Cartrans 3000. Ltd | Cardiff | 2018 |
| Cartrefi JDW CYF | Cardigan | 2010 |
| Cartrefle Brewery Ltd | Bristol | 2019 |
| Cartridge Depot Limited | Bedford | 2012 |
| Cartridge Giant Ltd | Manchester | 2006 |
| Cartridge Monkey Limited | Manchester | 2005 |
| Cartridgemonkey.Com Limited | Manchester | 2005 |
| Carturntables Limited | Tamworth | 2006 |
| Cartus Business Answers (NO.2) PLC | Swindon | 1989 |
| Cartwheel Inn Whitsbury Limited | Fordingbridge | 2000 |
| Cartwright Homes Limited | Loughborough | 2015 |
| Caru TI Limited | Porth | 2013 |
| Carus PBS UK Ltd | Warwick | 2012 |
| Caruso Group Ltd | Dunmow | 2020 |
| Carvall Management Limited | Edinburgh | 2009 |
| Carvery Taverns Limited | Keighley | 2018 |
| Carvetian Nominees Limited | Peterborough | 2015 |
| Carvets Limited | Dorset | 2003 |
| Carwood Defence Limited | Coventry | 2018 |
| Carwood Diesel Systems Limited | Coventry | 2012 |
| Carwood Management Company Limited | Belfast | 2000 |
| Caryland Limited | Castle Cary | 2011 |
| Carynx Limited | London | 2011 |
| CAS Capital 2010 Ltd | Southend-On-Sea | 2010 |
| CAS Nominees Ltd | Bodmin | 2005 |
| CAS Payroll Limited | Stockport | 2008 |
| Casa Bella Industries S.A. Limited | Olney | 2009 |
| Casa Casa Group Limited | Cheltenham | 2025 |
| Casa China (UK) Ltd | Tiverton | 2002 |
| Casa Cielo Ltd | London | 2022 |
| Casa Colori Design Limited | Gourock | 2017 |
| Casa Falcao Limited | Macclesfield | 2019 |
| Casa Goias Ltd | London | 2025 |
| Casa Juan Investments Ltd | London | 2024 |
| Casa Loyalist Tourism Ltd. | London | 2024 |
| Casa Moneta Ltd | Colchester | 2016 |
| Casa One SIP Trustee Limited | Newcastle Upon Tyne | 2016 |
| Casa Palatina Ltd. | London | 2022 |
| Casa Property Development Limited | St. Albans | 2007 |
| Casa Revo Limited | Grantham | 2019 |
| Casa Saxonia Real Estate Limited | London | 2015 |
| Casa Sibilla Limited | London | 2010 |
| Casa Vignali Ltd | Derby | 2024 |
| Casabien Ltd | Ibstock | 2024 |
| Casablanca Nominee Limited | Nether Alderley | 2012 |
| Casamag Ltd | London | 2021 |
| Casamigos Sailing Company Ltd | London | 2024 |
| Casarta Services Limited | London | 1987 |
| Casasdelsol Ltd | Chorley | 2015 |
| Casburn Consulting Limited | Reading | 2007 |
| Casca Limited | Nottingham | 2013 |
| Cascade Drinks Limited | Torquay | 2019 |
| Cascade Hollow Support Network Ltd | Manchester | 2026 |
| Cascade Ridge Business Advisors Ltd | Manchester | 2026 |
| Cascades of Glory Ltd | Bexhill-On-Sea | 2003 |
| Cascades Shopping Centre Nominee NO. 1 Limited | London | 2005 |
| Cascades Shopping Centre Nominee NO. 2 Limited | London | 2005 |
| Cascais Investments Limited | East Molesey | 2024 |
| Cascco Union Co., Ltd | London | 2016 |