| CK Wealth Limited | Real estate | 2024 |
| CK21 Holdings Ltd | Real estate | 2025 |
| CK24 Beauty Ltd | Other services | 2021 |
| CK99 Limited | Wholesale & retail | 2025 |
| CKA Prime Properties Ltd | Real estate | 2026 |
| Ckarj Ltd | Transport & logistics | 2025 |
| Ckashcapital Ltd | Financial services | 2023 |
| Ckav Ltd | Real estate | 2024 |
| CKB Consultancy (Midlands) Ltd | Real estate | 2020 |
| CKC Dimensions Limited | Professional & scientific | 2022 |
| CKE Maintenance Ltd | Manufacturing | 2026 |
| CKG Labs Limited | Real estate | 2020 |
| CKI Asset Management Limited | Professional & scientific | 2016 |
| CKK & Rose Properties Ltd | Real estate | 2023 |
| Ckrill Ltd | Hospitality | 2022 |
| Cksa Limited | Administrative & support | 2017 |
| CKT Properties Ltd | Real estate | 2025 |
| CKU Creative Limited | Arts & recreation | 2024 |
| CKW Aesthet:X Limited | Health & social care | 2018 |
| CL 1 Realisations Ltd | Wholesale & retail | 2018 |
| CLA & SIL Future Communication Limited | Professional & scientific | 2009 |
| CLA Online Services Ltd | Professional & scientific | 2025 |
| Cladagh Properties Ltd | Households | 2025 |
| Cladding Components Limited | Construction | 1968 |
| Claim Contact Centre Ltd | Other services | 2007 |
| Claim NOW Ltd | Professional & scientific | 2019 |
| Claim Time Clock Ltd | Professional & scientific | 2025 |
| Claim Time Limited | Professional & scientific | 2005 |
| Claim Today Limited | Professional & scientific | 2000 |
| Claims Assist UK (Moseley) Limited | Administrative & support | 2008 |
| Claims Management and Adjusting Limited | Financial services | 1994 |
| Clair Holdings Limited | Real estate | 2017 |
| Clair Investment Holdings Limited | Financial services | 2025 |
| Clair Townsend Ltd | Education | 2023 |
| Claire Bullock Consultancy Limited | Information & communication | 2020 |
| Claire English Ltd | Manufacturing | 2010 |
| Claire Price Ltd | Wholesale & retail | 2021 |
| Claire Selina Fashion Ltd | Wholesale & retail | 2026 |
| Claire's Accessories UK Ltd | Wholesale & retail | 1995 |
| Claire's European Services Limited | Administrative & support | 2008 |
| Clairfield EOT Limited | Professional & scientific | 2021 |
| Clairfield Limited | Professional & scientific | 2014 |
| Clairville York Ltd | Financial services | 1987 |
| Clamp Bros Ltd | Transport & logistics | 2007 |
| Clan Glow Limited | Construction | 2019 |
| Clanchatton Birmingham Limited | Extraterritorial | 1998 |
| Clap Factory Limited | Wholesale & retail | 2024 |
| Clapham Store Ltd | Wholesale & retail | 2022 |
| Clapham Tones Ltd | Other services | 2025 |
| Clara Barton's Care Services Ltd | Health & social care | 2022 |
| Clara Claire Energy Services Limited | Professional & scientific | 2014 |
| Clara Plus Ltd | Hospitality | 2025 |
| Claran Design Ltd | Administrative & support | 2007 |
| Clare Healthcare Limited | Wholesale & retail | 2015 |
| Clare Westwood Consultancy Ltd | Professional & scientific | 2024 |
| Claremont Bilston (Management Company) Limited | Households | 2007 |
| Claremont Capital Limited | Construction | 2009 |
| Claremont Capital SPV9 Ltd | Real estate | 2009 |
| Claremont Commercial 1 Ltd | Administrative & support | 2019 |
| Claremont Group Limited | Real estate | 2003 |
| Claremont Land & New Homes (Stourbridge) Limited | Construction | 2017 |
| Claremont Land & New Homes (the Bell) Limited | Real estate | 2018 |
| Claremont Land & New Homes Limited | Construction | 2013 |
| Claremont Land & New Homes Summerhill Limited | Real estate | 2019 |
| Claremont Land and New Homes (Redditch) Limited | Real estate | 2021 |
| Claremont Lettings & Management Limited | Real estate | 2010 |
| Claremont Living Group Limited | Construction | 2013 |
| Claremont Living Plus Limited | Construction | 2023 |
| Claremont Living Property Limited | Real estate | 2019 |
| Claremont Motorsport Limited | Wholesale & retail | 2009 |
| Claremont PEN Development Ltd | Real estate | 2018 |
| Claremont PG Limited | Real estate | 2009 |
| Claremont Planning Consultancy Ltd | Professional & scientific | 2016 |
| Claremont Property Development Ltd | Construction | 2014 |
| Claremont Property Portfolio Limited | Real estate | 2000 |
| Claremont Residential 1 Limited | Real estate | 2019 |
| Claremont UK Limited | Real estate | 2004 |
| Clarence 1980 Limited | Real estate | 2022 |
| Clarence Care Limited | Health & social care | 2012 |
| Clarence Housing Group Ltd | Hospitality | 2024 |
| Clarence News (Midlands) Ltd | Wholesale & retail | 2022 |
| Clarence News (UK) Ltd | Extraterritorial | 2016 |
| Clarendon Glazing & Plastics Ltd | Construction | 2016 |
| Clarendon News 1988 Ltd | Information & communication | 2021 |
| Clarendon Property Solutions Ltd | Real estate | 2022 |
| Clarendon Stays Management Ltd | Real estate | 2025 |
| Clarendon Tailors & Alterations Ltd | Manufacturing | 2025 |
| Clarendon Upvc Glazing Limited | Construction | 2012 |
| Claridge & Wild Driving School Limited | Professional & scientific | 2015 |
| Clarilis Limited | Information & communication | 2011 |
| Claritas Employment Tax Limited | Professional & scientific | 2014 |
| Claritas Tax Advisers Limited | Professional & scientific | 2019 |
| Claritas Tax Limited | Professional & scientific | 2012 |
| Claritas Universal Ltd | Health & social care | 2019 |
| Clarity & Coin Ltd | Professional & scientific | 2025 |
| Clarity Agile Limited | Administrative & support | 2025 |
| Clarity Birmingham Limited | Real estate | 2021 |
| Clarity Care Housing Ltd | Real estate | 2025 |
| Clarity Care Living Ltd | Health & social care | 2023 |
| Clarity Care Services Ltd | Health & social care | 2013 |