| Country Bar and Gardens Ltd | Hospitality | 2020 |
| Country Canines Hydrotherapy Ltd | Professional & scientific | 2026 |
| Country Pubs and Bars Ltd | Hospitality | 2023 |
| Countryscale Limited | Real estate | 1999 |
| Countrywide Conveyancing Limited | Professional & scientific | 1981 |
| Countrywide Mortgage Services Limited | Professional & scientific | 1986 |
| Countrywide North Limited | Professional & scientific | 1994 |
| County GAS Installations Ltd | Construction | 2020 |
| County Square (Chelmsford) Management Company Limited | Real estate | 1990 |
| Courtash Consultants Limited | Administrative & support | 2009 |
| Courtyard Litigation Limited | Professional & scientific | 2022 |
| Coventry Power Steering 2019 Limited | Manufacturing | 2019 |
| Coversport Limited | Professional & scientific | 2024 |
| Cowdel Clarke Limited | Real estate | 2002 |
| Cozynestpro Ltd | Construction | 2025 |
| CP Aesthetics Ltd | Health & social care | 2019 |
| CP Properties Group Ltd | Real estate | 2022 |
| CPR35 Auditors Ltd | Other services | 2023 |
| CQ Property Investment Limited | Real estate | 2024 |
| CR Advisory Limited | Administrative & support | 2025 |
| CR Holdco Limited | Financial services | 2025 |
| CR Topco Limited | Financial services | 2025 |
| Crackenagi Ltd. | Information & communication | 2025 |
| Crafternauts Limited | Arts & recreation | 2023 |
| Craig Cash Ltd | Information & communication | 2000 |
| Cramlington Land Partnership | | 2000 |
| Crane Property Investments Ltd | Financial services | 2021 |
| Cranford Cafe Limited | Hospitality | 2002 |
| Cranleigh Property Ltd | Real estate | 2022 |
| Cranwaite (Management) Limited | Real estate | 1994 |
| Craven Creative Limited | Arts & recreation | 2025 |
| Crawford Freehold Limited | Real estate | 2025 |
| Crawford HS Limited | Professional & scientific | 2025 |
| Crawford Properties (NW) Ltd | Real estate | 2025 |
| Crayfish Media Limited | Manufacturing | 2023 |
| CRC Propco Limited | Real estate | 2021 |
| Cream Soda Recruitment Limited | Administrative & support | 2015 |
| Create Health and Safety Ltd | Professional & scientific | 2015 |
| Create MCR Ltd | Professional & scientific | 2020 |
| Createnovate Limited | Professional & scientific | 2016 |
| Creative Asymmetry Ltd | Information & communication | 2024 |
| Creative Brand Collective Ltd | Manufacturing | 2024 |
| Creative Building Consulants Limited | Construction | 2016 |
| Creative Technology and Education Limited | Real estate | 2014 |
| Creative Viking Ltd | Professional & scientific | 2025 |
| Credible Alternatives Reference Organisation Limited | Professional & scientific | 2021 |
| Credit Science Analytics Limited | Administrative & support | 2014 |
| Creditdrive Limited | Financial services | 2025 |
| Creed (EOT) Limited | Administrative & support | 2022 |
| Creed Communications Limited | Professional & scientific | 2007 |
| Creme 'N' Cake Cheshire Limited | Manufacturing | 2025 |
| Creme Rabbit Ltd | Manufacturing | 2025 |
| Crescent Exchange Solutions Holdings Limited | Administrative & support | 2009 |
| Crescent Homes (UK) Limited | Real estate | 2000 |
| Cresco Industrial Supplies Limited | Wholesale & retail | 1995 |
| Crest Investment & Trading Limited | Real estate | 1984 |
| Crest Lodge Bramhall Management Company Limited | Households | 1984 |
| Cresta World Travel Limited | Administrative & support | 1991 |
| Crestcare Recruitment Limited | Administrative & support | 2017 |
| Crews Commercial Consultants Ltd | Professional & scientific | 2011 |
| Cricket Investor Holdings Limited | Financial services | 2024 |
| Crispy Dosa Caterers Limited | Hospitality | 2016 |
| Criteria Limited | Real estate | 2023 |
| Critical Path Consulting Ltd | Construction | 2023 |
| Critical ST Limited | Professional & scientific | 2022 |
| Croft & Pickles Properties Limited | Real estate | 2016 |
| Crofton Communications Limited | Professional & scientific | 2015 |
| Crogga (UK) Ltd | Mining & quarrying | 2018 |
| Croire Limited | Professional & scientific | 2012 |
| Cromeshield Property Management Company Limited | Professional & scientific | 1995 |
| Crompton Technical Recruitment Ltd | Administrative & support | 2026 |
| Cromwell Corporate Protector Limited | Professional & scientific | 2008 |
| Crooked Sticks Limited | Wholesale & retail | 2004 |
| Crosscountry Consulting UK Limited | Professional & scientific | 2021 |
| Crossflow TV Ltd | Information & communication | 2014 |
| Crosshall Regeneration LP | | 2010 |
| Crossward Limited | Real estate | 2002 |
| Crotchet Capital Limited | Financial services | 2025 |
| Crowfield Investments Limited | Real estate | 2025 |
| Crown Leaders Co Ltd | Professional & scientific | 2021 |
| Crown Van Gelder Limited | Manufacturing | 2024 |
| Crowns Events Ltd | Administrative & support | 2023 |
| CRP Engineering Limited | Professional & scientific | 2023 |
| Crudelink Technologies Ltd | Information & communication | 2025 |
| CRW Enterprises Limited | Wholesale & retail | 2021 |
| CRX24 Ltd | Administrative & support | 2026 |
| Cryoniq Ltd. | Wholesale & retail | 2016 |
| Crystal Application Limited | Professional & scientific | 2025 |
| Crystal Dept Limited | Wholesale & retail | 2024 |
| Crystalkil Limited | Administrative & support | 2021 |
| CS Cucina Limited | Hospitality | 2023 |
| CS Derby Limited | Real estate | 2018 |
| CS Specialists Ltd | Health & social care | 2022 |
| Csabi Medical Ltd | Health & social care | 2020 |
| CSC Global Limited | Wholesale & retail | 2017 |
| CSC NOM1 Limited | Professional & scientific | 2017 |
| CSC NOM2 Limited | Professional & scientific | 2017 |
| CSE (Nominee) Limited | Real estate | 2016 |
| CSJ Consultancy Ltd | Administrative & support | 2024 |
| CSJ Technical Solutions Limited | Administrative & support | 2014 |