| C & a Company Secretarial Services Limited | Bromsgrove | 2009 |
| C & a Hardman Limited | Suffolk | 2004 |
| C & a Webb Limited | Walsall | 2013 |
| C & B Mortimer Ltd | Exeter | 2010 |
| C & B Technical Services Limited | Redcar | 1998 |
| C & C Proctor Property Investments Limited | Preston | 2021 |
| C & C Properties Beccles Ltd | Great Yarmouth | 2024 |
| C & C Properties NE Limited | Middlesbrough | 2023 |
| C & C Ripley Ltd | Woking | 2023 |
| C & C Software Solutions Limited | Swindon | 2014 |
| C & D Rentals Limited | Mansfield | 2015 |
| C & F Associates Limited | Sutton | 2023 |
| C & G Practice Limited | West Midlands | 2007 |
| C & G Product Limited | Coventry | 2013 |
| C & G Recruitment Limited | Chesterfield | 2007 |
| C & J Haycock Limited | St. Ives | 1957 |
| C & J Investments Limited | Somerset | 1997 |
| C & K Ricketts Ltd | Salisbury | 2005 |
| C & L Duncan Limited | Hamilton | 2014 |
| C & L Investments (NW) Ltd | Ruthin | 2024 |
| C & M Colchester Limited | Halstead | 2019 |
| C & M Woodturning Limited | Peacehaven | 2003 |
| C & N (Publishing) Limited | Ayrshire | 1997 |
| C & O Group Limited | Blandford | 2009 |
| C & O Reeves Limited | Penzance | 2013 |
| C & R Ceylon UK Ltd | Feltham | 2021 |
| C & R Creative Designs Limited | Solihull | 2005 |
| C & R Property London Limited | London | 2007 |
| C & S Systems UK Limited | Macclesfield | 2000 |
| C & T Radmall Funeral Services Limited | Nottingham | 2002 |
| C 26 Limited | London | 2024 |
| C a Parsons & Company Limited | London | 1913 |
| C and J Speight Limited | Castleford | 2014 |
| C and L Brickworks Limited | Nottingham | 2006 |
| C and L Collections Ltd | Brentford | 2015 |
| C and L Team Limited | Torquay | 2012 |
| C and P Taxis Ltd. | Dunbar | 2000 |
| C B a Consultants Limited | Nottingham | 2018 |
| C B Accounting Limited | Diss | 2024 |
| C B Consultants (Yorkshire) Limited | Leyburn | 2024 |
| C B Watts Holdings Limited | Dereham | 2024 |
| C Bastock Limited | Solihull | 2007 |
| C C a Consultants Limited | Glasgow | 2005 |
| C C Compactors Limited | Bognor Regis | 2009 |
| C C Company Secretarial Services Limited | 80 Upper Street | 1989 |
| C C Systematics Limited | Merseyside | 2014 |
| C Crossley (Holdings) Ltd | Liversedge | 2024 |
| C D Anderson Inc Limited | Harrow | 2015 |
| C D M Construction (N.I.) Ltd | Magherafelt | 1999 |
| C E Mark Consultancy Limited | Colchester | 2002 |
| C E Musicworks Ltd | Retford | 2021 |
| C EX C Limited | Epsom | 1997 |
| C F Lettings (Bath) Limited | Camberley | 2009 |
| C Fewster & SON Funeral Services Limited | Hull | 2015 |
| C Four Twenty C Limited | London | 2025 |
| C G Booth Limited | Nottingham | 2006 |
| C G Jung Centre Limited | Eastbourne | 2013 |
| C Geary Developments Limited | London | 2021 |
| C H B G & R B (Alton) Limited | Aldershot | 2012 |
| C H B G & R B Limited | Aldershot | 2012 |
| C Harris Plumbing & Heating Ltd | Barnsley | 2019 |
| C I Accountancy (UK) Limited | Hexham | 2016 |
| C J Civils NW Ltd | Wigan | 2024 |
| C J Financial Planning Limited | Doncaster | 2010 |
| C J Goss Limited | Aylesbury | 1962 |
| C J Joinery & Fitting Services Limited | Dronfield | 2020 |
| C J Luckhurst Limited | Canterbury | 2001 |
| C J Maintenance Limited | Weston Super Mare | 1994 |
| C J Richards Electrical Limited | Newport Pagnell | 2005 |
| C J Wealth Management Limited | Doncaster | 2010 |
| C K Financial Planning Limited | Dudley | 1995 |
| C K Services Grab Hire Limited | Rothersthorpe | 2009 |
| C K Wealth Management Limited | Dudley | 2008 |
| C King Holdings Ltd | Chesterfield | 2013 |
| C L Jennings (1995) Limited | London | 1994 |
| C Lawson Engineering Ltd | Rotherham | 2019 |
| C M Environmental Services Ltd | Ilkeston | 2009 |
| C M Investment Nominees Limited | Henley-On-Thames | 1988 |
| C M Roofing Ltd | Portsmouth | 2012 |
| C ME ZS Limited | London | 2019 |
| C N Broomhead Limited | Wilmslow | 1935 |
| C N C Asset Management Ltd | Finmere | 1999 |
| C O'Neill Ltd | Omagh | 2012 |
| C P C Petrest Limited | Bristol | 2015 |
| C P E Global Limited | Glasgow | 2014 |
| C P Rowe Holdings Ltd | Bristol | 2019 |
| C P Scharff Limited | Milton Keynes | 2007 |
| C P Tasty Products Limited | London | 1990 |
| C R Butler Trading Limited | Orpington | 2003 |
| C R Four Investments Ltd | Hyde | 2014 |
| C R Hales Property Limited | Lowestoft | 2013 |
| C R R Haulage Limited | Potters Bar | 2020 |
| C R Smith Conservatories Limited | Fife | 1984 |
| C R Smith Glaziers (Fastglass) Limited | Dunfermline | 1972 |
| C R Smith Limited | Dunfermline | 2012 |
| C R Windows Ltd | Bristol | 2025 |
| C S Classic Parts Limited | Nuneaton | 2010 |
| C S Mortgage Solutions Limited | Kendal | 2019 |
| C S Retirement Solutions Limited | Kendal | 2019 |
| C Seddon Ltd | St Helens | 2012 |