| Buy the Same Token Ltd | Manufacturing | 2018 |
| BUY4SELL Limited | Wholesale & retail | 2022 |
| Buzz Electrics Limited | Construction | 2001 |
| Buzz Electrics Properties Ltd | Real estate | 2021 |
| Buzzard Ents Ltd | Arts & recreation | 2021 |
| Buzztracks Ltd | Manufacturing | 2022 |
| Bwt-South East Limited | Construction | 2000 |
| BY Bailey Ltd | Financial services | 2023 |
| BY Rachel Jade Ltd | Other services | 2024 |
| Byteone Ltd | Professional & scientific | 2025 |
| B’Luxe Limited | Other services | 2022 |
| C & C Cleaning Services Ltd | Other services | 2002 |
| C & L Dwyer-Smith Limited | Real estate | 2012 |
| C C Glazing Ltd | Construction | 2016 |
| C G Mackay Limited | Professional & scientific | 2002 |
| C Hall Sonographer Ltd | Health & social care | 2023 |
| C J Sutherland Property Services Limited | Administrative & support | 2025 |
| C L Bailey Ltd | Professional & scientific | 2025 |
| C Macgregor Solutions Ltd | Information & communication | 2003 |
| C W Landscapes Limited | Construction | 2002 |
| C&C Dent Limited | Health & social care | 2021 |
| C&C Dent Property Ltd | Real estate | 2026 |
| C&D South Coast Partnership Ltd | Financial services | 2017 |
| C&H Formwork and Construction Ltd | Construction | 2025 |
| C&H Ventures Ltd | Wholesale & retail | 2025 |
| C-Wave Consulting Services Ltd | Professional & scientific | 2025 |
| C. Mccullough Asset Management Ltd | Administrative & support | 2006 |
| C. Mccullough Wealth Management Ltd | Extraterritorial | 2006 |
| C. P. Collins Limited | Construction | 2003 |
| C3 Productions Ltd | Arts & recreation | 2007 |
| Cabezac Collections Limited | Wholesale & retail | 2010 |
| Cabin Health and Wellness Ltd | Wholesale & retail | 2025 |
| Cabins and Castles Ltd | Hospitality | 2018 |
| Cable Compounds Ltd | Professional & scientific | 2022 |
| Cacaotales Limited | Wholesale & retail | 2015 |
| Cadguys Developments Ltd | Construction | 2025 |
| Caelestis Regnum Limited | Manufacturing | 2025 |
| CAESIUM133 Ltd | Financial services | 2020 |
| Cafe DEL Golfo Ltd | Wholesale & retail | 2010 |
| Cafe Poem Ltd | Hospitality | 2017 |
| Cafe Rust Ltd | Hospitality | 2018 |
| Cafe Rust Museum Ltd | Hospitality | 2024 |
| Caide Hair Ltd | Other services | 2018 |
| Caine the Wonder Dog Ltd | Hospitality | 2023 |
| Calabria Dream Ltd | Hospitality | 2019 |
| Calcot Properties Limited | Households | 2013 |
| Calibration Works Limited | Other services | 2025 |
| California Shutters Limited | Wholesale & retail | 2003 |
| Calliope Works Ltd. | Professional & scientific | 2015 |
| Callipygian Consultancy Ltd | Professional & scientific | 2020 |
| Calmr Ltd | Manufacturing | 2024 |
| Calo Technologies Limited | Information & communication | 2022 |
| Calsal Limited | Real estate | 2000 |
| Calvey Limited | Professional & scientific | 2018 |
| Cambercite Limited | Education | 2012 |
| Cambridge & London Limited | Real estate | 1997 |
| Cameron Contemporary Art Ltd | Wholesale & retail | 2012 |
| Cami Brows Limited | Other services | 2022 |
| Camillin Denny Limited | Professional & scientific | 2022 |
| Camley Photographic Limited | Wholesale & retail | 2012 |
| Camperfun Ltd | Administrative & support | 2014 |
| Camtec GAS Services Limited | Construction | 2020 |
| CAN Study Abroad UK Ltd | Education | 2017 |
| Canary UK Holdco Limited | Financial services | 2024 |
| CANDG70 Limited | Hospitality | 2022 |
| Cannonball E Bikes Ltd | Administrative & support | 2021 |
| Canopus Farm Solar Limited | Energy | 2013 |
| Canterstor Ltd | Other services | 2016 |
| Canterstor Properties LLP | | 2016 |
| Capeq Limited | Extraterritorial | 2014 |
| Capestock Investments Ltd | Real estate | 2021 |
| Capital Chase Limited | Administrative & support | 2005 |
| Capital Locks Limited | Other services | 2011 |
| Caplin Carpets Limited | Construction | 2006 |
| Capnova CO2 Ltd | Manufacturing | 2026 |
| Cappel Ltd | Construction | 2019 |
| Capsule Records Ltd | Wholesale & retail | 2022 |
| Capsule Ventures Ltd | Real estate | 2021 |
| Captain Cool Ltd | Manufacturing | 2020 |
| Caradoc Enterprises Ltd | Professional & scientific | 2013 |
| Caramba Latin Grill Ltd | Hospitality | 2023 |
| Carden's Business Advisers Limited | Professional & scientific | 2006 |
| Carelet Limited | Real estate | 2002 |
| Carepoint Services Limited | Health & social care | 2007 |
| Caretaker Property Limited | Households | 2019 |
| Cargo Design Studio Limited | Professional & scientific | 2017 |
| Caribbean Lifestyle Services Ltd | Real estate | 2021 |
| Caring Hands Gardening Ltd | Administrative & support | 2023 |
| Carla Armour Ltd | Information & communication | 2015 |
| Carla Carey Limited | Professional & scientific | 2018 |
| Carlisle Court Limited | Households | 2001 |
| Carlisle Road Investments Ltd | Real estate | 2024 |
| Carlyle Estates Limited | Real estate | 2005 |
| Carmaview Property Management Limited | Households | 2001 |
| Carmel House (Hove) RTM Company Limited | Households | 2014 |
| Carnemough Solar Project Limited | Energy | 2014 |
| Caromusic Ltd | Arts & recreation | 2022 |
| Carpimia Ltd | Hospitality | 2025 |
| Carrera Performance Ltd | Wholesale & retail | 2025 |
| Carrick Estates LLP | | 2025 |