| Byova Rend Ltd | Construction | 2025 |
| Byteing Support Services Limited | Professional & scientific | 2000 |
| C & B Construction and Maintenance Ltd | Construction | 2025 |
| C & D Supplies Limited | Wholesale & retail | 2023 |
| C & G Produce Limited | Agriculture & fishing | 1997 |
| C & K Installations Limited | Construction | 2018 |
| C & M Location Services Limited | Information & communication | 2002 |
| C a M Electrical Contractors Limited | Construction | 2014 |
| C a N Medics Limited | Health & social care | 2020 |
| C Group Property Limited | Real estate | 2019 |
| C I V Iacub-Tile Ltd | Construction | 2023 |
| C J Perry Limited | Other services | 2023 |
| C K Developments (South-East) Ltd | Construction | 2017 |
| C&C Capital Access Ltd | Professional & scientific | 2025 |
| C&M Driveways Ltd | Construction | 2020 |
| C&O Property Solutions Ltd | Real estate | 2025 |
| C'S Ideal Builders Limited | Construction | 2023 |
| C. & M. Interiors Limited | Construction | 1997 |
| C. P. Plumbing Ltd | Construction | 2016 |
| C.G. Haulage Limited | Transport & logistics | 1994 |
| C.L. Pre-Schools Limited | Education | 2019 |
| C02 Drinks Ltd | Manufacturing | 2010 |
| C2 Legal Limited | Other services | 2016 |
| C2A Solutions Ltd | Transport & logistics | 2025 |
| C3M Electrical Ltd | Construction | 2022 |
| C4C Export Ltd | Wholesale & retail | 2013 |
| CA Business Administration Limited | Professional & scientific | 2019 |
| Cabcom Ltd | Transport & logistics | 2024 |
| Caccou Limited | Professional & scientific | 2012 |
| Cadalyst Limited | Professional & scientific | 2016 |
| Cadeau Properties Ltd | Real estate | 2019 |
| Cafe Bloom Limited | Hospitality | 2026 |
| Cafe Morocco Ltd | Hospitality | 2023 |
| Cage Consulting Ltd | Professional & scientific | 2017 |
| Calcite Limited | Wholesale & retail | 2021 |
| Calista Foods Ltd | Wholesale & retail | 2007 |
| Calverley Consulting Ltd | Professional & scientific | 2025 |
| Calverley Creative Limited | Wholesale & retail | 2025 |
| Calytop Healthcare Limited | Health & social care | 2023 |
| Calytz Imaging Limited | Health & social care | 2020 |
| CAM Content Limited | Professional & scientific | 2025 |
| CAM Locks (Management Company) Limited | Households | 2009 |
| CAM MEP Services Ltd | Construction | 2024 |
| Cambridge Advisers Limited | Financial services | 2021 |
| Cambridge Renovations and Development Ltd | Construction | 2024 |
| Cameron Creations Ltd | Arts & recreation | 2019 |
| Camp NOU Limited | Financial services | 2012 |
| Campaign Leaders Limited | Professional & scientific | 2022 |
| Campbell Medical Solutions Ltd | Health & social care | 2026 |
| Campion Place Management Services Limited | Households | 2017 |
| Camspan Lettings Ltd | Real estate | 2024 |
| Camspan Property Ltd | Real estate | 2021 |
| Canalability | Transport & logistics | 2004 |
| Candlish Connect Ltd | Wholesale & retail | 2026 |
| Candorra Consulting Limited | Construction | 2023 |
| Canes Developments Limited | Construction | 2022 |
| Cannabidiol Confectionery Ltd | Wholesale & retail | 2020 |
| Cannon Electronics & Automation Limited | Manufacturing | 1960 |
| Cannons Partners Ltd | Wholesale & retail | 2021 |
| Canopy Lane RTM Company Limited | Real estate | 2021 |
| Cantabrigia Holdings Limited | Construction | 2009 |
| Canvas Data Ltd | Information & communication | 2026 |
| Canvas Discount Ltd | Wholesale & retail | 2016 |
| CAP One Services Limited | Information & communication | 2019 |
| Capelo Design Limited | Professional & scientific | 2016 |
| Capital Equity & Money Ltd | Households | 2021 |
| Capital G Ventures Ltd | Wholesale & retail | 2023 |
| Capital Investment Ventures Ltd | Real estate | 2023 |
| Capitalcliff Limited | Wholesale & retail | 1989 |
| Captain COD Boston Limited | Hospitality | 2020 |
| Captain Takis Ltd | Information & communication | 2025 |
| Carbernet Toolkit Ltd | Administrative & support | 2015 |
| Carbon 6 Records Limited | Arts & recreation | 2017 |
| Carbon Frost Limited | Wholesale & retail | 2025 |
| Carbontwin Technologies Ltd | Information & communication | 2023 |
| Care and Compassion Healthcare Limited | Health & social care | 2018 |
| Care at Hand Limited | Health & social care | 2005 |
| Care Brigade Ltd | Extraterritorial | 2023 |
| Care by ME Limited | Health & social care | 2021 |
| Care Champion Limited | Health & social care | 2023 |
| Care Direct Introductions Limited | Health & social care | 2021 |
| Care Guardians Ltd | Health & social care | 2019 |
| Care Just 4U Limited | Health & social care | 2014 |
| Care Just 4U Property Limited | Real estate | 2026 |
| Care the Right Way Ltd | Public administration | 2024 |
| Career and Educational Services Limited | Education | 2021 |
| Caremart Limited | Health & social care | 2017 |
| Carenet Solutions Limited | Information & communication | 2023 |
| Careoceans Limited | Health & social care | 2025 |
| Carepath Consultancy Limited | Health & social care | 2026 |
| Carepath Services Ltd | Health & social care | 2022 |
| Carepromed Ltd | Health & social care | 2023 |
| Careview Advisory Limited | Professional & scientific | 2026 |
| Careview Capital Limited | Professional & scientific | 2026 |
| Careview Group Limited | Administrative & support | 2026 |
| Caring Betty Limited | Health & social care | 2018 |
| Carl's Burger's Ltd | Other services | 2017 |
| Carla Foods Limited | Administrative & support | 2006 |
| Carlita COM Ltd | Transport & logistics | 2015 |
| Carlson Medical Limited | Health & social care | 2013 |