| Bunnymen Ltd | Real estate | 2025 |
| Busy BEE Business Solutions Ltd | Professional & scientific | 2021 |
| C & S Clothing Wholesale Ltd | Wholesale & retail | 2026 |
| C W Blunt Ltd | Construction | 2007 |
| C.A. Sharp Ltd | Manufacturing | 2025 |
| Cafe DE LA MER Ltd | Hospitality | 2023 |
| Cairnx Ltd | Extraterritorial | 2016 |
| CAL Construction Limited | Construction | 2015 |
| Caldyne Hub Limited | Administrative & support | 2025 |
| Calvert Plumbing Solutions Limited | Construction | 2026 |
| Camchar Ltd | Financial services | 2013 |
| CAP Carpentry Ltd | Construction | 2016 |
| Cardcentral Hits Limited | Wholesale & retail | 2026 |
| Care Guaranteed Ltd | Health & social care | 2019 |
| Carlton Haines Ltd | Professional & scientific | 1999 |
| Carnieaviation Limited | Transport & logistics | 2019 |
| Casa 001 Limited | Real estate | 2026 |
| Casamao LLP | | 2009 |
| Cascade Consulting (Environment & Planning) Limited | Professional & scientific | 2001 |
| Castle Premier Services Limited | Extraterritorial | 2013 |
| Castle Vehicle Leasing Holdings Limited | Financial services | 2013 |
| Catag UK Ltd | Professional & scientific | 2025 |
| Catherine Gray Limited | Information & communication | 2019 |
| Cellular Solutions and Services Limited | Information & communication | 1999 |
| Cellular Solutions Network Services Limited | Information & communication | 2013 |
| Cendling Limited | Professional & scientific | 2025 |
| Central Calibration Services Limited | Other services | 2020 |
| Central London Houses Ltd. | Real estate | 2017 |
| Centre for Spirituality CIC | Other services | 2024 |
| Centresouth Limited | Real estate | 1989 |
| Cerebro Partners Ltd | Administrative & support | 2025 |
| CG Barnes Plumbing & Heating Ltd | Construction | 2011 |
| CG Property Development Ltd | Manufacturing | 2022 |
| CGH Rutterford Ltd | Professional & scientific | 2023 |
| CGW Accountancy Ltd | Professional & scientific | 2026 |
| Chalkline Group Limited | Information & communication | 2022 |
| Chalkline Solutions Limited | Information & communication | 2016 |
| Chamois Holdings Limited | Financial services | 2020 |
| Chamois Metrology Limited | Professional & scientific | 2004 |
| Champion Property Brokers Ltd | Extraterritorial | 2019 |
| Channings Hove Limited | Households | 1989 |
| Chapter 34 Limited | Wholesale & retail | 2023 |
| Charjar Events Limited | Professional & scientific | 2023 |
| Charlwoods Management Company Limited | Real estate | 1985 |
| Chartaero Services Ltd | Transport & logistics | 2025 |
| Chartwell Court Residents Limited | Households | 1998 |
| Chatham Consulting Ltd | Information & communication | 2003 |
| Chatham Place Consulting Ltd | Professional & scientific | 2013 |
| Chie Consulting Limited | Information & communication | 2002 |
| Child Care Assessment Limited | Professional & scientific | 2014 |
| Chima Property Limited | Real estate | 2023 |
| Church Green Residents Company (NO.1) Limited | Households | 1984 |
| Churchers Mobility Ltd | Wholesale & retail | 2014 |
| Circle UP Technology Limited | Information & communication | 2025 |
| Civora Limited | Professional & scientific | 2025 |
| Cjsfx Ltd | Administrative & support | 2025 |
| Clanfield Systems Limited | Manufacturing | 1995 |
| Clare Topham & Co Ltd | Professional & scientific | 2011 |
| Clarityblu Limited | Professional & scientific | 2025 |
| Clarke Property Sussex Ltd | Real estate | 2019 |
| Clean Step (UK) Limited | Professional & scientific | 1993 |
| Clearview Cleaning Sussex Ltd | Administrative & support | 2012 |
| Cleeves Financial Services Limited | Financial services | 2018 |
| Cloud Concepts Accounting Ltd | Professional & scientific | 2018 |
| Cloud Voice and Data Ltd | Professional & scientific | 2019 |
| Clubhouse Coffee (Arundel) Ltd | Hospitality | 2025 |
| Cmsoft Ltd | Information & communication | 2007 |
| Coalis Limited | Professional & scientific | 2015 |
| Coastal Spaces Freeholds Ltd | Real estate | 2024 |
| Coastal Spaces Sussex Ltd | Real estate | 2024 |
| Coastool Limited | Construction | 2021 |
| Coco Mango Ltd | Wholesale & retail | 2018 |
| Colin Hinchliffe Limited | Wholesale & retail | 2024 |
| Collesco Property Development (Residents) Company Limited | Households | 1958 |
| Colm Mckee Town and Country Planning Limited | Professional & scientific | 2017 |
| Commercial Kitchen Engineers Limited | Manufacturing | 2014 |
| Community Physio Ltd | Health & social care | 2018 |
| Company Paradiso | Education | 1996 |
| Complete Construction (Sussex) Limited | Construction | 2020 |
| Concept Kitchens and Bathrooms Limited | Construction | 2019 |
| Concert & Corporate Crew Ltd. | Arts & recreation | 2004 |
| Conduco Resourcing Ltd | Administrative & support | 2023 |
| Coniston Court (Weybridge) Residents' Association Limited | Households | 1997 |
| Connect 2 Care Limited | Professional & scientific | 2008 |
| Consolelog Ltd | Information & communication | 2024 |
| Constantine Capital Limited | Professional & scientific | 2022 |
| Constellation Consultancy Ltd | Construction | 2021 |
| Consult Benj Ltd. | Information & communication | 2017 |
| Consulting Smart Ltd | Information & communication | 2006 |
| Contact Systems Group Limited | Information & communication | 2021 |
| Contact Systems Limited | Information & communication | 2016 |
| Cooling UK Limited | Construction | 2004 |
| Cooper and Sons Holdings Limited | Financial services | 2023 |
| Copthorne MOT Centre Limited | Wholesale & retail | 2025 |
| Copy Matters Ltd | Professional & scientific | 2022 |
| COR Europe Limited | Wholesale & retail | 2009 |
| Core Elements Training Limited | Health & social care | 2019 |
| Core Healthcareuk Ltd | Administrative & support | 2024 |
| Cosmos B Properties Ltd | Real estate | 2021 |
| Cottey Holdings Ltd | Construction | 2026 |