| Bushell's Carpentry Ltd | Manufacturing | 2021 |
| Butterfly Fields Ltd | Real estate | 2018 |
| Buzzy BEE Eco Limited | Construction | 2025 |
| Bydid International Limited | Professional & scientific | 2014 |
| Bystevieacademy Limited | Education | 2022 |
| C & W Seals Limited | Manufacturing | 2004 |
| C R Plumbing Contractors Limited | Construction | 2026 |
| C.J. Strand Limited | Wholesale & retail | 2001 |
| C.J.E. Micro's Limited | Manufacturing | 1987 |
| C2BM Solutions Ltd | Construction | 2025 |
| C3 Energy Solutions Limited | Construction | 2004 |
| Cafe a Serio Limited | Hospitality | 2019 |
| Calderwood Associates Limited | Professional & scientific | 2008 |
| CAM Properties Ltd | Real estate | 2020 |
| Cambridge Integrated Solutions Ltd | Construction | 2022 |
| Cameron Soft Drinks Limited | Wholesale & retail | 2012 |
| Cammells Property Ventures Ltd | Real estate | 2002 |
| Cammish Partners Ltd | Professional & scientific | 2026 |
| Campaign Support Ltd | Other services | 2018 |
| Canda Data and Electrical Services Ltd | Construction | 2022 |
| Canine Design Sussex Limited | Other services | 2026 |
| Canvas by Tracie Ltd | Administrative & support | 2025 |
| Capital Direct Solutions Limited | Administrative & support | 2013 |
| Capital Equity Release Limited | Real estate | 2002 |
| Capital Urban Limited | Real estate | 2020 |
| Car and Van MOT Services Limited | Wholesale & retail | 2002 |
| Carbonox Limited | Professional & scientific | 2022 |
| Cardino Management Limited | Real estate | 2019 |
| Carer Exchange UK Limited | Health & social care | 2019 |
| Carfu Creative Ltd | Professional & scientific | 2019 |
| CASH4GARAGES Ltd | Real estate | 2018 |
| Cassidy Holdings Limited | Wholesale & retail | 2025 |
| Castle View Brokers Ltd | Professional & scientific | 2024 |
| Castleview (Amberley) Freehold Limited | Households | 2011 |
| Cat Burglar Dough Co Ltd | Manufacturing | 2021 |
| Catwell Lettings Limited | Real estate | 2017 |
| Cavendish Court (Brighton) RTM Company Limited | Households | 2012 |
| Caxton Estates Limited | Extraterritorial | 2012 |
| CBR Property Management Ltd | Real estate | 2018 |
| CBS Property Services Ltd | Construction | 2026 |
| CC Solar Smart Eco Homes Ltd | Construction | 2020 |
| Cdec Electrical Limited | Construction | 2013 |
| CDN Fitness Solutions Limited | Education | 2026 |
| CE Components Ltd | Wholesale & retail | 2021 |
| Centalign Ltd | Wholesale & retail | 2023 |
| Central Beach Limited | Other services | 2013 |
| Centurion Corporate Solutions Ltd | Real estate | 2013 |
| Ceradon Ltd | Information & communication | 2001 |
| CEW Aviation Ltd | Wholesale & retail | 2021 |
| CGA Automation Limited | Manufacturing | 2005 |
| CGA Global Holdings Ltd | Financial services | 2021 |
| CH Logistics Ltd | Transport & logistics | 2024 |
| Chamaeleon Marketing Limited | Information & communication | 2008 |
| Chanctonbury Game Limited | Manufacturing | 2014 |
| Chanterlane Media Systems Limited | Professional & scientific | 1979 |
| Chantry Building Services Limited | Construction | 2011 |
| Chapel Park Road Management Company Limited | Extraterritorial | 2006 |
| Charbeck Ltd | Professional & scientific | 2022 |
| Charlotte House Residents Association Limited | Households | 2005 |
| Chatfield Business Solutions Ltd | Professional & scientific | 2026 |
| Chauffeur Taxis 2018 Limited | Transport & logistics | 2018 |
| Chaz Specialist Services Limited | Other services | 2014 |
| Chermont Court Management Limited | Households | 1989 |
| Chiltoncare Ltd | Administrative & support | 2025 |
| Chimera Group Limited | Information & communication | 2015 |
| China Palace (Worthing) Limited | Hospitality | 2003 |
| Chinsky Productions Ltd | Arts & recreation | 2022 |
| Chophouse Littlehampton Ltd | Hospitality | 2019 |
| Chris and Delia Holdings Limited | Administrative & support | 2016 |
| Chris Lane Leisure (Holdings) Limited | Arts & recreation | 2015 |
| Chunsum Limited | Health & social care | 2004 |
| Church Farm Gardens Limited | Households | 2002 |
| Churchfields Apartments Residents Co Ltd | Households | 2014 |
| Churchfields Residents Management Company Limited | Households | 2011 |
| Cicero's Hair Company Limited | Other services | 2009 |
| Cider IS Wine Ltd | Professional & scientific | 2018 |
| CIM Flight Solutions Ltd | Transport & logistics | 2023 |
| Cimbian UK Ltd | Wholesale & retail | 2003 |
| Cindy Thompson Entertainment Agency, Ltd. | Arts & recreation | 2015 |
| City Wood Floors Ltd | Construction | 2001 |
| Civvie Box CIC | Health & social care | 2026 |
| CJB Carpentry & Construction Ltd | Manufacturing | 2023 |
| Clamar Management Company Limited | Households | 1989 |
| Clarity Business Analysis Ltd | Information & communication | 2015 |
| Classics on Offer Ltd | Wholesale & retail | 2025 |
| Clearmould Limited | Professional & scientific | 2026 |
| Clearwater Mortgages Limited | Financial services | 2006 |
| Cleeves Court (Rustington) Management Company Limited | Households | 1998 |
| Client Match Consulting Limited | Professional & scientific | 2014 |
| Cloud 9 Contractors Ltd | Construction | 2011 |
| Cloud 9 Electrical Ltd | Construction | 2024 |
| Cloud 9 Joinery Ltd | Manufacturing | 2016 |
| CLOUD9 Protein Ltd | Wholesale & retail | 2025 |
| CMS Sussex Ltd | Extraterritorial | 2014 |
| Coachhouse Cabinets Limited | Manufacturing | 1999 |
| Coanmaths Consulting Limited | Education | 2011 |
| Coarse Fish UK Limited | Agriculture & fishing | 2011 |
| Coast (Harsfold Road) Management Limited | Households | 2001 |
| Coastal Accountancy Services Limited | Professional & scientific | 2017 |
| Coastal Fire Systems Limited | Public administration | 2023 |