| Cass Driving Ltd | Education | 2025 |
| Cassio Quarter Management Company Limited | Households | 2011 |
| Casterbridge Wealth Limited | Financial services | 2015 |
| Castikipots Limited | Manufacturing | 2016 |
| Castle EPM Limited | Administrative & support | 2016 |
| Castle Grounds Property Ltd | Real estate | 2023 |
| Castle Grove (Pontefract) Management Company Limited | Households | 2004 |
| Castle Mews (Pontefract) Management Company Limited | Households | 2006 |
| Castle Portcullis Limited | Real estate | 2023 |
| Castle View (Old Sarum) Management Company Limited | Households | 2009 |
| Castle Well Roofing & Construction Ltd. | Construction | 2024 |
| Castlegate Business Park (Salisbury) Limited | Extraterritorial | 2013 |
| Castles Technology UK & Ireland Ltd | Manufacturing | 2020 |
| Castleton Court (Haverfordwest) Management Company Limited | Households | 2014 |
| Catalina Spas and Hot Tubs Ltd | Professional & scientific | 2003 |
| Catalina Spas Limited | Wholesale & retail | 1997 |
| Catalyst CPD Ltd | Education | 2026 |
| Catch Global Limited | Financial services | 2026 |
| Catch of the Day (PFL) Limited | Professional & scientific | 2022 |
| Catch Resource Management Limited | Administrative & support | 2001 |
| Catch RM Group Limited | Financial services | 2018 |
| Catch RM US Limited | Administrative & support | 2023 |
| Catchpole Limited | Professional & scientific | 2014 |
| Catercounter Ltd | Manufacturing | 2025 |
| Cathedral Architecture Limited | Professional & scientific | 2026 |
| Cathedral Communications Limited | Information & communication | 1992 |
| Cathedral Court Residents Association Limited | Households | 1973 |
| Cathedral Gate (Salisbury) NO.1 Management Company Limited | Households | 2013 |
| Cathedral Gate (Salisbury) NO.2 Management Company Limited | Households | 2013 |
| Cathedral Gate Construction Limited | Construction | 2024 |
| Cathedral Gate Holdings Ltd | Construction | 2013 |
| Cathedral Home Healthcare Ltd | Health & social care | 2024 |
| Cathedral Park (Chichester) Management Company Limited | Households | 2020 |
| Catherine Ware VPA Ltd | Administrative & support | 2024 |
| Catherine Wilson Consulting Ltd | Professional & scientific | 2020 |
| Catkin & Pussywillow Limited | Wholesale & retail | 2014 |
| Catteshall Court (Godalming) Management Company Limited | Households | 2021 |
| Caulkhead Investments Limited | Real estate | 2002 |
| Cavalier Leisure Limited | Wholesale & retail | 2010 |
| Cavanfields UK Limited | Wholesale & retail | 2002 |
| Cavendish Films Ltd | Information & communication | 2006 |
| Cavita Management Limited | Professional & scientific | 2006 |
| CAW (Group) Limited | Construction | 2013 |
| Cawden and Cadworth Ltd | Professional & scientific | 2013 |
| Cawood Wardrobe Ltd | Wholesale & retail | 2026 |
| CBG Data Centre Limited | Financial services | 2024 |
| CBM Software Solutions Ltd | Information & communication | 2013 |
| CBS Finance a Ltd | Financial services | 2017 |
| CBS Finance B Ltd | Financial services | 2015 |
| CBS Finance Ltd | Real estate | 2021 |
| CBS Real Estate Group Ltd | Financial services | 2022 |
| Ccbc Property Ltd | Construction | 2026 |
| Ccma Property Finance Limited | Financial services | 2017 |
| CCO Properties Ltd | Real estate | 2022 |
| CCS Salisbury Limited | Wholesale & retail | 2023 |
| CDT Electrical Limited | Construction | 2022 |
| CDV Services Ltd | Professional & scientific | 2018 |
| CE Salvage Limited | Wholesale & retail | 2015 |
| Cedar Care Training Limited | Education | 2010 |
| Cedar Designs Limited | Construction | 2015 |
| Cedar House RTM Company Limited | Households | 2010 |
| Cellected Limited | Professional & scientific | 2021 |
| Cellseco Limited | Manufacturing | 2010 |
| Celtic Brick and Stone Limited | Professional & scientific | 2014 |
| Central Park (Phase II) Headingley Management Company Limited | Households | 2006 |
| Centre for AI & Climate Ltd | Professional & scientific | 2021 |
| Centre Stage (Rendlesham) Management Company Limited | Households | 2006 |
| Centurion Centre Management Company Limited | Real estate | 1999 |
| Century House (Salisbury) Limited | Households | 2005 |
| Cerca (UK) Limited | Real estate | 2012 |
| Cerebral Chip Ltd | Professional & scientific | 2022 |
| Ceylon Premium Gems UK Ltd | Wholesale & retail | 2026 |
| Ceylon Taste Private Limited | Hospitality | 2024 |
| CF Southern Trading Ltd | Wholesale & retail | 2014 |
| Cfft Fire Ltd | Manufacturing | 2025 |
| Cfico Limited | Financial services | 2021 |
| CFL Plumbing & Heating Ltd | Construction | 2019 |
| CFS Electrical Limited | Construction | 2015 |
| CFY Solutions Limited | Wholesale & retail | 2018 |
| CG Boutique Ltd | Wholesale & retail | 2022 |
| CH Property Trustee a Lyons Limited | Financial services | 2019 |
| CH Property Trustee Ahmed Limited | Financial services | 2018 |
| CH Property Trustee Aizlewood & Casson Limited | Financial services | 2007 |
| CH Property Trustee AK Trust Limited | Financial services | 2007 |
| CH Property Trustee Akenside Limited | Financial services | 2007 |
| CH Property Trustee Ayers Hodges Limited | Financial services | 2011 |
| CH Property Trustee Baker Limited | Financial services | 2018 |
| CH Property Trustee Bands Capital Limited | Financial services | 2016 |
| CH Property Trustee Bayliss Limited | Financial services | 2019 |
| CH Property Trustee Binns and LA Trobe Limited | Financial services | 2014 |
| CH Property Trustee Brookes Limited | Financial services | 2014 |
| CH Property Trustee Brookes NO2 Limited | Financial services | 2014 |
| CH Property Trustee Burrage Limited | Financial services | 2007 |
| CH Property Trustee Burt Limited | Financial services | 2011 |
| CH Property Trustee Butt Limited | Financial services | 2017 |
| CH Property Trustee C Whewell Limited | Financial services | 2018 |
| CH Property Trustee CAM Limited | Financial services | 2006 |
| CH Property Trustee Caulfield Limited | Financial services | 2007 |
| CH Property Trustee Charles Nixon Limited | Financial services | 2009 |
| CH Property Trustee Comber Limited | Financial services | 2016 |