| Car Boot Soul Records Limited | Wholesale & retail | 2017 |
| Car Mechanic Ltd | Wholesale & retail | 2020 |
| Car Park Valeting Limited | Administrative & support | 1995 |
| Car PARTS1 UK Limited | Wholesale & retail | 2021 |
| Caracalla 1947 Limited | Wholesale & retail | 2012 |
| Caramore Properties Limited | Construction | 2014 |
| Carapax Health Ltd | Information & communication | 2026 |
| Carbon 12 Ltd | Administrative & support | 2021 |
| Carby & Co Ltd | Information & communication | 2020 |
| Card Aura Ltd | Administrative & support | 2025 |
| Card-Link LLP | | 2011 |
| Cardinal Solicitors Ltd | Professional & scientific | 2016 |
| Cardinals (NO.1) Management Company Limited | Real estate | 2017 |
| Cardio Pro Limited | Wholesale & retail | 2015 |
| Care 2 Tech Limited | Health & social care | 2025 |
| Care 4 UK88TM Ltd | Health & social care | 2014 |
| Care Carers Ltd | Health & social care | 2018 |
| Care Castle Ltd | Health & social care | 2023 |
| Care More Recruitment Limited | Administrative & support | 2019 |
| Care NAV Support CIC | Education | 2025 |
| Care Network Services Limited | Health & social care | 2020 |
| Care Solutions Recruitment Agency Ltd | Administrative & support | 2014 |
| Care Support Help Ltd | Health & social care | 2020 |
| Care Tax Abroad Ltd | Professional & scientific | 2019 |
| Care Wisdom Services Ltd | Administrative & support | 2016 |
| Care World Agency Ltd | Health & social care | 2013 |
| CARE2COUNSEL Ltd | Health & social care | 2013 |
| Carecutz Ltd | Other services | 2025 |
| Career Invest Ltd | Professional & scientific | 2020 |
| Careers Ladder Ltd. | Administrative & support | 2011 |
| Carefree Getaways Ltd | Administrative & support | 2026 |
| Carelay Mobile Maintenance Ltd | Administrative & support | 2021 |
| Caremore Group Ltd | Health & social care | 2018 |
| Carers Help Ltd | Wholesale & retail | 2024 |
| Careshield Croydon Limited | Health & social care | 2025 |
| Cargross Ltd | Wholesale & retail | 2020 |
| Caribbean Collections Limited | Wholesale & retail | 2019 |
| Caribbean Diaspora Skills Directory CIC | Other services | 2018 |
| Caribbean Indulgence Ltd | Wholesale & retail | 2022 |
| Caribbean Legal Services Limited | Professional & scientific | 2016 |
| Caribbean Rotie's Limited | Hospitality | 2025 |
| Caribbean Shipping Services Ltd | Transport & logistics | 2009 |
| Caribuena CIC | Hospitality | 2026 |
| Caridon Consortium Ltd | Real estate | 2013 |
| Caridon Developments Ltd | Professional & scientific | 2015 |
| Caridon Holdings LLP | | 2015 |
| Caridon Management Ltd | Real estate | 2017 |
| Caridon Trading Ventures 1 Ltd | Real estate | 2017 |
| Caridon Trading Ventures 2 Ltd | Real estate | 2017 |
| Caridon Trading Ventures Ltd | Financial services | 2018 |
| Caring for Carers Gold Ltd | Health & social care | 2025 |
| Caring Hand Services Limited | Administrative & support | 2019 |
| Caring Homecare Limited | Health & social care | 2020 |
| Caris Community Care Limited | Health & social care | 2019 |
| Carisbrooke Displays Limited | Professional & scientific | 2013 |
| Cariver Global Estates Limited | Hospitality | 2025 |
| Carla's Casas Ltd | Real estate | 2021 |
| Carlock Group Limited | Administrative & support | 2025 |
| Carlssons Motorworks Ltd | Wholesale & retail | 2020 |
| Carlton Building Plastics Limited | Wholesale & retail | 1988 |
| Carlton Investment Ltd | Real estate | 2013 |
| Carly's Cutiecles Limited | Other services | 2021 |
| Carlyle Mews Management Company Limited | Households | 1999 |
| Carmel Greystone Ltd | Financial services | 2000 |
| Carmot Ltd | Wholesale & retail | 2007 |
| Carnaby & Knight Limited | Administrative & support | 2018 |
| Carnatic Court (Liverpool) Management Limited | Households | 2013 |
| Carne Camden Ltd | Hospitality | 2020 |
| Caroline Kohn Limited | Administrative & support | 2018 |
| Carology Customisations Ltd | Other services | 2025 |
| Carpathian Property Services Ltd | Construction | 2026 |
| Carpediem Immigration Services Limited | Administrative & support | 2025 |
| Carpeep Ltd | Information & communication | 2025 |
| Carpet Corner Limited | Extraterritorial | 2009 |
| Carrera Diamonds Limited | Professional & scientific | 2011 |
| Carriage Cars Banbury Limited | Transport & logistics | 2025 |
| Carrick Court (Freehold) Limited | Households | 2003 |
| Carrick Court (Management) Limited | Households | 1978 |
| Carrington Manufacturing Co.,Limited | Real estate | 1920 |
| Carrington Place Management Company Limited | Households | 1999 |
| Carroll Marketing Services 2024 Ltd | Administrative & support | 2025 |
| Carron Investments Limited | Financial services | 1999 |
| Carros One Limited | Real estate | 2026 |
| Carsmina Properties Ltd | Real estate | 2025 |
| Carston Close Properties Limited | Households | 2001 |
| Carter Willis LLP | | 2018 |
| Cartridgebuyback Ltd | Wholesale & retail | 2023 |
| Carté Luxury Limited | Wholesale & retail | 2021 |
| Carvermor & Co LLP | | 2026 |
| Carvermor Holdings Limited | Financial services | 2026 |
| CAS Early Learning Academy Limited | Education | 2025 |
| Casa Mamei Ltd | Wholesale & retail | 2023 |
| Casa-Fusion Limited | Real estate | 2025 |
| Casablanca Catering Limited | Hospitality | 2022 |
| Casbah MED Cuisine Ltd | Hospitality | 2020 |
| Cascades (Kenley) Management Limited | Households | 2006 |
| Cascode Solutions Ltd | Professional & scientific | 2023 |
| Case DI Lusso Ltd | Construction | 2025 |
| Casey Properties London Ltd | Real estate | 2021 |
| Cash & Carry Beds Ltd | Wholesale & retail | 2020 |