| Cawcliffe Ltd | Wholesale & retail | 2025 |
| CAY College CIC | Education | 2023 |
| Cayuga 002 Ltd | Administrative & support | 2016 |
| Cayuga 009 LLP | | 2020 |
| CB Financial Advisers LLP | | 2008 |
| Cbfa Holdings Limited | Professional & scientific | 2020 |
| CBX Tech Limited | Extraterritorial | 2021 |
| CBX Trustees LLP | | 2011 |
| CCH (Worthing) RTM Company Limited | Households | 2025 |
| CCK Limited | Information & communication | 2025 |
| Cckt Limited | Information & communication | 2019 |
| CCL Management Ltd | Professional & scientific | 2026 |
| CCS Express Limited | Transport & logistics | 2003 |
| Ccsc Productions Limited | Extraterritorial | 2024 |
| CE Productions Limited | Information & communication | 2021 |
| Cecil House Properties Limited | Households | 2015 |
| Cedar Garage Holdings Limited | Financial services | 2025 |
| Celine Bridal Ltd | Wholesale & retail | 2025 |
| Cellar Arts Club C.I.C. | Arts & recreation | 2017 |
| Cellar Craft UK Ltd | Hospitality | 2025 |
| Cellcrypt Limited | Information & communication | 2005 |
| Celly's Worthing Ltd | Other services | 2026 |
| CEM Creative Ltd | Information & communication | 2023 |
| CEN Air Solutions Limited | Construction | 2019 |
| Centaur Affinity Limited | Financial services | 2025 |
| Centaur Risk Solutions Limited | Financial services | 2025 |
| Center Healthcare Limited | Administrative & support | 2022 |
| Centered Healing Ltd | Other services | 2019 |
| Central Auto Repairs Ltd | Wholesale & retail | 2021 |
| Central Networks 2025 Nominee Limited | Agriculture & fishing | 2016 |
| Central Networks Nomineeco Limited | Agriculture & fishing | 2019 |
| Centralopen Residents Management Limited | Real estate | 1989 |
| Centre for Bio-Ethical Reform UK | Education | 2010 |
| Centre for the Future of Work Limited | Information & communication | 2025 |
| Centrestage Hair Company Limited | Other services | 1987 |
| Centurion Safety Solutions Limited | Education | 2024 |
| Ceres Health Food Store Limited | Wholesale & retail | 2004 |
| Ceri Services Ltd | Transport & logistics | 2024 |
| Certright Ltd | Construction | 2026 |
| Cestria Ltd | Households | 2003 |
| Ceuber Limited | Information & communication | 2012 |
| Cfbow Ltd | Professional & scientific | 2023 |
| CFC Blue Limited | Professional & scientific | 2012 |
| CFS EOT Trustee Limited | Financial services | 2022 |
| CG Design Services Ltd | Wholesale & retail | 2018 |
| CGF Music Ltd | Arts & recreation | 2018 |
| CGM Developments Limited | Construction | 2025 |
| CH & Sons Ltd | Wholesale & retail | 2025 |
| CH Properties & Investments Limited | Real estate | 1992 |
| Chace Catering Ltd | Hospitality | 2021 |
| Chadley House Training Limited | Other services | 2004 |
| Chadwick Surveying Limited | Professional & scientific | 2005 |
| Chainlink Renewables Ltd | Construction | 2020 |
| Chalfen of London Limited | Wholesale & retail | 2018 |
| Chalk Films Media Limited | Information & communication | 2020 |
| Chalk Ridge Productions Ltd | Information & communication | 2021 |
| Chalk Springs Trout Fishery Limited | Agriculture & fishing | 2009 |
| Chalk Wovens UK Ltd | Manufacturing | 2012 |
| Challis Consultancy Ltd | Professional & scientific | 2023 |
| Chamberlain Investments Limited | Administrative & support | 1996 |
| Chameleon Construction and Landscaping Limited | Construction | 2018 |
| Chameleonix Limited | Professional & scientific | 2019 |
| Chamond Media Ltd | Information & communication | 2019 |
| Chanctonbury Estates Limited | Real estate | 2010 |
| Chandec Limited | Construction | 2013 |
| Chaney & Chaney Limited | Real estate | 2016 |
| Changency Ltd | Professional & scientific | 2024 |
| Chanmil Care Ltd | Health & social care | 2018 |
| Chantellefen Ltd | Information & communication | 2024 |
| Chantry Carpentry & Construction Ltd | Construction | 2009 |
| Chapman Solutions Ltd | Information & communication | 2010 |
| Chapter Three Consulting Ltd | Professional & scientific | 2012 |
| Character Home Design & Build Ltd | Construction | 2020 |
| Chargate Property Limited | Professional & scientific | 2006 |
| Charles James Property Ltd | Real estate | 2014 |
| Charley Barleys Nursery Limited | Education | 2016 |
| Charlotte Allday Interior Design Limited | Other services | 2015 |
| Charlotte Law Limited | Administrative & support | 2009 |
| Charman Homes Ltd | Construction | 2023 |
| Charmandean Farm Limited | Real estate | 2026 |
| Charmandean Real Estate Limited | Construction | 2021 |
| Charndon Ltd | Other services | 2010 |
| Charolais Developments Limited | Real estate | 2019 |
| Charta Recruitment Limited | Administrative & support | 2020 |
| Charter Recovery Housing CIC | Health & social care | 2023 |
| Charter UK Limited | Information & communication | 1989 |
| Chase Fencing Supplies Limited | Manufacturing | 2021 |
| Chase Wilder Productions Ltd | Information & communication | 2024 |
| Chatsworth House Worthing Limited | Real estate | 2006 |
| Chatsworth Road Holdings Limited | Other services | 2015 |
| Chattercare Ltd | Administrative & support | 2024 |
| CHC Building Services Limited | Construction | 2019 |
| Chelmer House (Lancing) Limited | Households | 2005 |
| Chelsea Construction (Sussex) Ltd | Construction | 2014 |
| Chelsea White Ltd. | Professional & scientific | 2013 |
| Chemical X Industries Limited | Professional & scientific | 2015 |
| Chequered Flag Engineering Ltd. | Professional & scientific | 2012 |
| Cherishport Media Ltd. | Information & communication | 2018 |
| Cheriton Group Limited | Professional & scientific | 2017 |
| Cheriton Properties Southern Limited | Real estate | 2021 |