| Caddies Subic Ltd | Wholesale & retail | 2026 |
| Cadence Concierge Ltd | Manufacturing | 2025 |
| Cadplus Design Solutions Limited | Professional & scientific | 2008 |
| CAE Inc Ltd | Professional & scientific | 2021 |
| Cafe Inn Serife Ltd | Hospitality | 2022 |
| CAG Installations Ltd | Construction | 2025 |
| Cake Box (Chatham) Ltd | Wholesale & retail | 2019 |
| Cake Box (Gravesend) Limited | Wholesale & retail | 2010 |
| Cake Box (Leamington Spa) Limited | Wholesale & retail | 2014 |
| Cake Box (Maidstone) Ltd | Wholesale & retail | 2016 |
| Cake Box (Strood) Limited | Wholesale & retail | 2013 |
| Cake Box (Upminster) Ltd | Wholesale & retail | 2018 |
| Cake Box CT Limited | Wholesale & retail | 2018 |
| Cake House Gravesend Ltd | Wholesale & retail | 2020 |
| Cakebox Bristol Limited | Wholesale & retail | 2017 |
| Cakebox Cardiff Ltd | Wholesale & retail | 2019 |
| Calabar Regal Ltd | Hospitality | 2025 |
| Cali Vapes Limited | Wholesale & retail | 2018 |
| Calibre Facility Services Ltd | Administrative & support | 2010 |
| Calin C Transport Ltd | Transport & logistics | 2021 |
| Calisu Trans Ltd | Transport & logistics | 2018 |
| Call ME Charlie Limited | Professional & scientific | 2021 |
| Callibr Ltd | Administrative & support | 2026 |
| Callisons Place Residents Company Limited | Households | 2006 |
| Calm and Organised Ltd | Professional & scientific | 2022 |
| Calm Ventures Ltd | Professional & scientific | 2025 |
| Calvo Trading Ltd | Wholesale & retail | 2023 |
| Cambrian Grove Ltd | Real estate | 2024 |
| Camden Blackmann Limited | Information & communication | 2019 |
| Camden Rose Limited | Real estate | 2023 |
| Camelot Management Co. Limited | Households | 1986 |
| Canaan Estate Ltd | Real estate | 2025 |
| Canal Industrial Park Management Company Limited | Professional & scientific | 1997 |
| Canapesandmore Ltd | Manufacturing | 2024 |
| Canary Training Ltd | Education | 2022 |
| Cando Personnel Ltd | Administrative & support | 2012 |
| Canics Ltd | Extraterritorial | 2017 |
| Canna Community Ltd | Administrative & support | 2022 |
| Cannexis Biopharma Ltd | Information & communication | 2025 |
| Canning Heights Freehold Ltd | Households | 2013 |
| Canning Heights Management Company Limited | Households | 2001 |
| Canterbury Fields Residents Limited | Households | 1999 |
| Canterbury Tyre Distributors Limited | Professional & scientific | 1942 |
| Cantia Arboricultural Service Ltd | Agriculture & fishing | 2019 |
| Canwest Media UK Limited | Professional & scientific | 2024 |
| Capital Express London Ltd | Wholesale & retail | 2016 |
| Capital Holdings Ltd | Real estate | 2015 |
| Capital TAC Limited | Real estate | 2024 |
| Captivair Pneumatics Limited | Administrative & support | 1998 |
| Capworth Consulting Limited | Professional & scientific | 2011 |
| Car Buying Corner Ltd | Wholesale & retail | 2025 |
| Car Crime Solutions Limited | Administrative & support | 2025 |
| Car for Today Ltd | Wholesale & retail | 2009 |
| Car Maintenance Ltd | Wholesale & retail | 2024 |
| Car Service Station Limited | Wholesale & retail | 2011 |
| Car Wash Guys Ltd | Other services | 2018 |
| Carbon and Code Ltd | Information & communication | 2025 |
| Cardmasters TCG Ltd | Wholesale & retail | 2025 |
| Care for Sure Limited | Health & social care | 2020 |
| Care Impact Ltd | Health & social care | 2023 |
| Career Nuggets Production | Education | 2015 |
| Careernest Ltd | Administrative & support | 2025 |
| Carefort Homes Limited | Health & social care | 2023 |
| Carefort Ltd | Administrative & support | 2017 |
| Carenaxe Ltd | Professional & scientific | 2025 |
| Carers Choice DGS | Health & social care | 2011 |
| Carersconnect Ltd | Health & social care | 2023 |
| Carey Plumbing and Heating Ltd | Construction | 2019 |
| Cargo Shipping Ltd | Transport & logistics | 2024 |
| Cariel Spirits International Limited | Wholesale & retail | 2016 |
| Carina Properties Limited | Real estate | 2004 |
| Caring Hands Support Group Ltd | Health & social care | 2025 |
| Carkk Ltd | Health & social care | 2020 |
| Carlight Ltd | Wholesale & retail | 2023 |
| Carlton Woodcraft Limited | Manufacturing | 2011 |
| Cars 2 Retail Ltd | Wholesale & retail | 2019 |
| Cars Bikes N Bits Ltd | Wholesale & retail | 2019 |
| Carston Freeholds Limited | Households | 2001 |
| Carter's Property Group Ltd | Real estate | 2025 |
| CAS Window Cleaning Limited | Administrative & support | 2012 |
| Casa RUE Ltd | Wholesale & retail | 2025 |
| Caselab Ltd | Wholesale & retail | 2026 |
| Cash Consoles Ltd | Wholesale & retail | 2024 |
| Cassidy Hall Building & Landscaping Ltd | Construction | 2024 |
| Castle Mews Tonbridge Management Company Limited | Households | 2022 |
| Castle Shaw Healthcare Limited | Professional & scientific | 2020 |
| Castle Shaw Holdings Ltd | Wholesale & retail | 2018 |
| Castle Shaw Ventures Limited | Real estate | 2024 |
| Castlemoore Quality Care Ltd | Public administration | 2021 |
| Castlemoore Support CIC | Hospitality | 2020 |
| Casual.Central Ltd | Wholesale & retail | 2022 |
| Catac Limited | Construction | 2005 |
| Catteshall Manor Godalming Ltd | Construction | 2019 |
| Catti Limited | Hospitality | 2025 |
| CAV Transport Ltd | Transport & logistics | 2016 |
| Caxtons Commercial Limited | Other services | 1990 |
| Caxtons Property Consultants Limited | Other services | 2023 |
| Cayman Mastics Limited | Construction | 2008 |
| CBF Mechanical Ltd | Construction | 2022 |
| CBM Engineering Limited | Construction | 2016 |