| C Smiley Group Limited | Cambridge | 2013 |
| C Soins Ltd | Dover | 2020 |
| C Spedding Limited | Manchester | 2003 |
| C T Planning Limited | Kenilworth | 2000 |
| C the Lite Property Limited | Derby | 2016 |
| C Tyas Rigging Services Limited | Rotherham | 2014 |
| C W D (Supplies) Limited | London | 2002 |
| C W Education Ltd | Retford | 2022 |
| C Walton Nominees Limited | Leeds | 2019 |
| C Woods Jewellery Limited | Southport | 2014 |
| C& E Wideway International Co., Ltd. | Gillingham | 2016 |
| C&C A872 Limited | Blackpool | 2021 |
| C&C Arts and Crafts Ltd | Beckenham | 2015 |
| C&F Business Consulting Limited | London | 2014 |
| C&G Bricklaying Contractors Ltd | Ely | 2024 |
| C&G Resin Specialists Ltd | Ely | 2024 |
| C&G Safety & Environmental Limited | Stroud | 2015 |
| C&Ic Ltd | Cheadle | 2012 |
| C&J Outdoors Limited | Chichester | 2025 |
| C&K Decorators Ltd | Doncaster | 2025 |
| C&K International Co., Ltd | London | 2007 |
| C&K Labs Limited | Wolverhampton | 2021 |
| C&L (UK) Properties Ltd | Watchfield | 2014 |
| C&L Building and Property Ltd | Bridgnorth | 2017 |
| C&L Capital Limited | Coventry | 2021 |
| C&M IP Limited | London | 2023 |
| C&O Izusu Limited | Blandford | 2024 |
| C&P 123 Limited | Orpington | 2010 |
| C&P Investment Holdings Ltd | Leigh-On-Sea | 2012 |
| C&R K9 Security Services Ltd | Hockliffe | 2013 |
| C&S Collectables Direct Ltd | Bognor Regis | 2004 |
| C&S Import Export Limited | Fareham | 2014 |
| C&S UK Group Limited | Hull | 2023 |
| C&T Industry Company Limited | West Midlands | 2006 |
| C&W Apparel Co., Ltd | Beckenham | 2013 |
| C&W YS Links Limited | London | 2021 |
| C&Y Sanitary Ware Co., Ltd | Cambridge | 2018 |
| C-Change Resources Limited | Ashford | 2020 |
| C-Fresh Limited | Redditch | 2020 |
| C-Me Sweden Limited | London | 2020 |
| C-Mist Limited | Edinburgh | 2006 |
| C-O-N-F-E-C-T-I-O-N-A-R-Y Island Ltd | Bristol | 2022 |
| C-Search Limited | Anglesey | 2012 |
| C-Skins Wetsuits Limited | Bodmin | 2002 |
| C-Store Reit Limited | London | 2012 |
| C-Tech Hub Ltd | London | 2023 |
| C. & O. Construction (Southern) Limited | Dorset | 2001 |
| C. & S. Dumpleton Limited | Luton | 1993 |
| C. & T. Publications Limited | Dorchester | 1961 |
| C. a. Savvides & Co Limited | Potters Bar | 2004 |
| C. and C. Law Limited | Colchester | 1991 |
| C. B. CNC Limited | Sheffield | 2005 |
| C. Bateman and Sons Ltd | Billericay | 2012 |
| C. C. Realisations Limited | Kettering | 1919 |
| C. Cloud Ltd | London | 2017 |
| C. E. & I. Gowns Limited | Birmingham | 1995 |
| C. Guilford Limited | Andover | 2010 |
| C. H. (Downton) Limited | Fulham London | 1957 |
| C. Hartley Joinery & Building Limited | Stockton On Tees | 2008 |
| C. J. Baines & Co. Limited | Staffordshire | 2001 |
| C. Jackson and Sons (Demolition) Limited | Bedfordshire | 2002 |
| C. M. Watson & Co. Limited | Cannock | 2002 |
| C. Mccullough Wealth Management Ltd | Hove | 2006 |
| C. N. a. Distribution Limited | King'S Lynn | 2009 |
| C. Powell Funeral Service Limited | Sutton Coldfield | 1978 |
| C. Rayner Limited | Chelmsford | 2016 |
| C. S. Casey & Co Limited | Sleaford | 2018 |
| C. Sibbick & Co. Limited | Brockenhurst | 2012 |
| C. Smart Agricultural Services Limited | Stockbridge | 1998 |
| C. Taylor Electrical Limited | Nuneaton | 2005 |
| C. Woodward Consultancy Ltd | Hertford | 2015 |
| C.& G. (Catering) Limited | Staffordshire | 1995 |
| C.A.L.M. Mums Club Ltd | London | 2020 |
| C.A.N.D.L.E. Properties Limited | Radlett | 2007 |
| C.C. (Caversham) Management Company Limited | Reading | 1983 |
| C.C.V. (North West) Ltd | Leeds | 1997 |
| C.D. Jordan & SON Limited | Westbrook Warrington | 1972 |
| C.D.B Consultation Limited | Holywood | 2015 |
| C.D.D. (Project Management) Limited | Colchester | 1985 |
| C.D.R. Manufacturing Limited | Liverpool | 2009 |
| C.E.L. (Engineering) Limited | Chippenham | 1974 |
| C.F. & A.U. Limited | London | 1950 |
| C.G.G. Ltd | Sheringham | 2000 |
| C.H Dhaliwal Limited | Birmingham | 2012 |
| C.H. (Group) Trading Ltd | Beckenham | 2021 |
| C.H.B.G Invest Ltd | Dover | 2023 |
| C.H.G. Management Company Limited | Shrewsbury | 2015 |
| C.H.T. Galvanizing Limited | West Midlands | 1990 |
| C.Hansen VVS Limited | London | 2025 |
| C.I. Silochi Ltd | Benfleet | 2020 |
| C.I.C. BEE Keepers Community Interest Company | Marlborough | 2019 |
| C.I.C. Repair & Services Holding Ltd | Taunton | 2010 |
| C.I.C. Repair & Services Holland Ltd | Taunton | 2010 |
| C.I.R.A.S. Limited | Gloucester | 1991 |
| C.J. Bent & SON Limited | Wigston | 1958 |
| C.J. Burgess and SON Limited | Middlesex | 2005 |
| C.J. Productions Limited | Buckinghamshire | 1994 |
| C.J.Moran (Services) Limited | London. | 1972 |
| C.K.B. Trading Limited | Portsmouth | 1989 |
| C.K.W. Academy Ltd | Rotherham | 2009 |