| Chaudhry Distribution Network (CDN) Ltd | Transport & logistics | 2025 |
| Chaudhry Enterprises Ltd | Real estate | 2021 |
| Cheam Road Residents Management Company Limited | Households | 2010 |
| Check Inventory Ltd | Public administration | 2025 |
| Cheeky Mare Ltd | Wholesale & retail | 2020 |
| Cheeky Twin Productions Limited | Information & communication | 2011 |
| Cheese&More Limited | Hospitality | 2022 |
| Cheezious Pizzeria T/A Pizzeria Roma Ltd | Hospitality | 2025 |
| Chelsea Court (Ashley Road) Management Company Limited | Households | 2009 |
| Chem UK Ltd | Wholesale & retail | 2020 |
| Chemsonic UK Ltd | Wholesale & retail | 2023 |
| Chesswood Limited | Extraterritorial | 1997 |
| Chestnut Court (Croydon) Management Company Limited | Households | 1986 |
| Chestnut Court Residents Association Limited | Real estate | 1969 |
| Chestnut Owners Ltd | Households | 2022 |
| Chestnut Planners Ltd | Professional & scientific | 2022 |
| Cheswood Consultants Ltd | Education | 2010 |
| Cheval Noir Holdings Limited | Information & communication | 2023 |
| Cheyne Court Residents Association (Banstead) Company Limited | Households | 1997 |
| Cheyne Court RTM Company Limited | Households | 2017 |
| Chia Designs Limited | Wholesale & retail | 1999 |
| Chichester (Leasing) Company Limited | Administrative & support | 1991 |
| Chichester House Epsom RTM Company Limited | Households | 2023 |
| Chichester Independent Hospital Limited | Health & social care | 1990 |
| Children First Uganda | Other services | 2008 |
| Chill OUT of School Company Limited | Education | 2005 |
| Chilli Tribe Records Ltd | Information & communication | 2019 |
| Chillout of School Club Ltd | Health & social care | 2024 |
| Chiltern Nurseries Limited | Health & social care | 2002 |
| Chilterns(Sutton)Management Company Limited(The) | Households | 1966 |
| Chimovici Transport Ltd | Transport & logistics | 2022 |
| China Chef Takeaway Ltd | Hospitality | 2023 |
| China Focus Limited | Information & communication | 2021 |
| China Greatwall Limited | Wholesale & retail | 2007 |
| China Training & Resource Centre | Other services | 2009 |
| Chinese Hunter SPV Limited | Construction | 2023 |
| Chinese Services Centre Ltd | Professional & scientific | 2025 |
| Chisq Limited | Information & communication | 1989 |
| Chivag Care Services Ltd | Health & social care | 2022 |
| CHM Lettings Ltd | Extraterritorial | 2024 |
| Chop Chop Fresh Salads Ltd | Hospitality | 2019 |
| Chris Richards & Co (Painters & Decorators) Ltd | Construction | 2009 |
| Chrissie Layzell Associates Ltd | Administrative & support | 2002 |
| Christ Church Ewell | Other services | 2008 |
| Christchurch Place Limited | Households | 1980 |
| Christian Schools Property Limited | Other services | 2004 |
| Christie Music Ltd | Arts & recreation | 2010 |
| Christopher Court (Tadworth) Limited | Households | 1991 |
| Chromahub UK Ltd | Information & communication | 2025 |
| Chromatic Labs Ltd | Information & communication | 2025 |
| Chronix Health CIC | Health & social care | 2026 |
| Chronix Health Group Ltd | Health & social care | 2025 |
| Chrysalis Business Transformations Ltd | Information & communication | 2019 |
| Chrysalis Investments Consulting Ltd | Real estate | 2021 |
| Chuckle Vision Limited | Information & communication | 2011 |
| Church Court Residents Association Limited | Households | 1995 |
| Church Gate RTM Company Limited | Households | 2016 |
| Church Paddock Court Management Limited | Households | 2000 |
| Church Road Londis Limited | Wholesale & retail | 2025 |
| Ciartech Limited | Extraterritorial | 2015 |
| Cicli Pinarello (UK) Limited | Wholesale & retail | 2012 |
| Cijb Ltd | Construction | 2019 |
| CIL (Exeter) Ltd | Real estate | 2002 |
| CIL Estates Ltd | Real estate | 2015 |
| CIL Land Limited | Real estate | 2014 |
| CIL South West Limited | Real estate | 2014 |
| Cilgerran Health Ltd | Wholesale & retail | 2019 |
| Cinimod Consulting Limited | Professional & scientific | 2011 |
| CIRCLE21 Global Limited | Information & communication | 2023 |
| Circuit Computer Brokerage Limited | Wholesale & retail | 1991 |
| Cirrus Aviation Consultancy Limited | Professional & scientific | 1999 |
| Cirrus Connects Group Limited | Financial services | 2020 |
| Cirrus Nova Limited | Wholesale & retail | 2011 |
| Cita Network Solutions Ltd | Construction | 2017 |
| Citric Properties Ltd | Real estate | 2026 |
| Citric Solutions Ltd | Information & communication | 2014 |
| City Power Electrical and Mechanical Limited | Construction | 2015 |
| City Psyche Partners Ltd | Professional & scientific | 2025 |
| Cityskyline Management Ltd | Administrative & support | 2009 |
| CJG Building Services Ltd | Construction | 2026 |
| CJH Carpentry & Building Services Limited | Construction | 2020 |
| CJK Developments Limited | Real estate | 2016 |
| CJR Building Services Ltd | Construction | 2026 |
| CK Barbers Ltd | Other services | 2024 |
| CK Elite Coaching Ltd | Arts & recreation | 2025 |
| CL Venues (Conference Line) Limited | Administrative & support | 2012 |
| Clackers IT Limited | Information & communication | 2026 |
| Claim 4 IT Limited | Professional & scientific | 2002 |
| Claire Court Management Sutton Limited | Households | 2001 |
| Clanova Collective Ltd | Professional & scientific | 2026 |
| Clarence Mitchell Communications Limited | Professional & scientific | 2015 |
| Clarendon Mews Enfranchisement Limited | Households | 2003 |
| Clarendon Mews Management Company Limited | Households | 2000 |
| Clarity Harbour Ltd | Wholesale & retail | 2024 |
| Clark and Bridle Limited | | 1949 |
| Clark Consulting Services Limited | Professional & scientific | 2007 |
| Clark Partnership LLP | | 2004 |
| Clarks Builders Limited | Construction | 2014 |
| Classic Evolution Ltd | Wholesale & retail | 2016 |
| Classic Home Care Services Limited | Health & social care | 2000 |