| Castle Wools Ltd | Wholesale & retail | 2024 |
| Castles Estate Limited | Agriculture & fishing | 2016 |
| Castlestone Properties Limited | Real estate | 1997 |
| Catalyst (London) Limited | Professional & scientific | 2016 |
| Catalyst Social Enterprise Limited | Education | 2011 |
| Catalyze EOT Limited | Administrative & support | 2021 |
| Catalyze Limited | Information & communication | 2001 |
| CATCH22 Secure Solutions Ltd | Information & communication | 2026 |
| Catoosa Campers & Conversions Ltd | Wholesale & retail | 2021 |
| Caudwell (Drayton) Limited | Agriculture & fishing | 1964 |
| Caudwell and Sons Limited | Agriculture & fishing | 1997 |
| Cavalli Limited | Professional & scientific | 2012 |
| Cavendish Grove Limited | Real estate | 2006 |
| CB Hygiene Services Ltd | Health & social care | 2008 |
| CBM Mortgages Ltd | Financial services | 2023 |
| CCM (Properties) Limited | Extraterritorial | 1973 |
| Cctv Enterprises LLP | | 2003 |
| CDG Creative Limited | Arts & recreation | 2023 |
| CDR Homecare Ltd | Health & social care | 2026 |
| Cedar Close Management Company (Winchester) Limited | Households | 2016 |
| Cedar Management Ltd | Information & communication | 2015 |
| Cell & Tell Limited | Wholesale & retail | 2024 |
| Celtic Tyre Services (Bridgend) Limited | Extraterritorial | 1963 |
| Celtic Tyre Services (Cardiff) Limited | Extraterritorial | 1968 |
| Celtic Tyre Services (Holdings) Limited | Extraterritorial | 1968 |
| Celtic Tyre Services (Maesteg) Limited | Extraterritorial | 1972 |
| CEM SGH Ltd | Construction | 2013 |
| Cenarth Limited | Real estate | 2016 |
| Centaur Legal Ltd | Professional & scientific | 2022 |
| Cerberus Commercial Services Ltd | Construction | 2026 |
| CES 101 Limited | Extraterritorial | 2012 |
| Cfgu Limited | Arts & recreation | 2011 |
| CFL Land Rovers Limited | Wholesale & retail | 2024 |
| Cfsp Property Ltd | Real estate | 2020 |
| CG Financial Planning Limited | Professional & scientific | 2020 |
| CG GUN Dogs Limited | Agriculture & fishing | 2020 |
| Cg-Circuits Ltd | Professional & scientific | 2019 |
| CGW Foodtech Limited | Professional & scientific | 2019 |
| CGW Property Limited | Households | 1995 |
| CH Design Partnership Limited | Professional & scientific | 1997 |
| Chalcraft and Clay Limited | Professional & scientific | 2014 |
| Chalfont House (Cadogan) Limited | Households | 1994 |
| Chalfont House (Chesham) Limited | Households | 1994 |
| Chalk Stream Medical Ltd | Health & social care | 2023 |
| Chalkdown Wine Limited | Manufacturing | 2013 |
| Chalkfield Winchester Limited | Real estate | 2000 |
| Chamsa Limited | Wholesale & retail | 2026 |
| Chancaru Limited | Wholesale & retail | 2025 |
| Chandler's Ford Chiropractic Clinic Limited | Health & social care | 2023 |
| Channel Development Consulting Limited | Professional & scientific | 2007 |
| Chaoueni IT Limited | Information & communication | 2019 |
| Chapel Cottage Easton Ltd | Professional & scientific | 2023 |
| Chapel Hill Limited | Energy | 2014 |
| Chapel Hill Properties Limited | Construction | 2019 |
| Chapman & Moore Limited | Wholesale & retail | 1996 |
| Chapman Garments Limited | Wholesale & retail | 2019 |
| Chardons Ltd | Hospitality | 2013 |
| Charlecote Residential Ltd | Real estate | 2025 |
| Charlecote Sussex Limited | Construction | 2026 |
| Charles and Lawrence Limited | Professional & scientific | 2000 |
| Charles Church Spitfires Limited | Arts & recreation | 1982 |
| Charles House Management Company Limited | Households | 2003 |
| Charles Stewart Group Ltd | Wholesale & retail | 2023 |
| Charlie Dalton Plumbing & Heating Ltd | Construction | 2024 |
| Chartwell Oak Buildings Ltd | Construction | 2015 |
| Chartwell Properties & Developments Ltd | Construction | 2015 |
| Chase Cycles Hampshire Limited | Wholesale & retail | 2018 |
| Chase the Sun Cycle Ltd | Arts & recreation | 2017 |
| Chatley Property Limited | Real estate | 2015 |
| Chauffeurai Ltd | Transport & logistics | 2023 |
| Chaworth Meadows Management Company Limited | Households | 2025 |
| Chayr Balay Interior Solutions Ltd | Wholesale & retail | 2025 |
| Cheek by Jowl Management Consultancy Ltd | Administrative & support | 2011 |
| Chef Kenan Limited | Hospitality | 2020 |
| Chelsea Connected Ltd | Information & communication | 2010 |
| Chene Arbre Limited | Real estate | 2024 |
| Cheriton Capital Limited | Real estate | 2023 |
| Cheriton Consulting Limited | Professional & scientific | 2025 |
| Cheriton Health Consulting Limited | Professional & scientific | 2023 |
| Cheriton Investments Limited | Real estate | 2016 |
| Cherrystones Vehicle Sales Ltd | Wholesale & retail | 2026 |
| Ches Editions Ltd | Wholesale & retail | 2019 |
| Chesil Rectory Limited | Hospitality | 2008 |
| Chesneys Architectural Limited | Professional & scientific | 2016 |
| Chesshood Ltd | Wholesale & retail | 2025 |
| Chessland Estates Ltd | Real estate | 2014 |
| Chestnut Avenue Management Limited | Real estate | 1989 |
| Chestnut Avenue RMC Limited | Households | 2026 |
| Cheungming Fortunes Company Limited | Administrative & support | 2023 |
| Chewbacca Strikes Back Ltd | Construction | 2020 |
| Chichester Wharf Management Company Limited | Households | 2004 |
| Chilcomb Down House Limited | Other services | 2022 |
| Chilcomb Down House Trust Limited | Other services | 2022 |
| Chilcomb Place Residents Association Limited | Households | 2014 |
| Chilcomb Valley Wines Limited | Agriculture & fishing | 2015 |
| Chill Nest Properties Ltd | Real estate | 2026 |
| Chilland Consulting Limited | Professional & scientific | 2011 |
| Chilland Family Investments Limited | Real estate | 2024 |
| Chilland Lane Partners Limited | Professional & scientific | 2021 |
| Chilling Ventures Limited | Financial services | 2026 |