| BWN Industrial Roofing & Cladding Maintenance Ltd | Construction | 2021 |
| BY Firelight Limited | Arts & recreation | 2023 |
| BY Smiles Ltd | Hospitality | 2026 |
| Byrom Design Limited | Professional & scientific | 2026 |
| Bytegen Limited | Information & communication | 2021 |
| Byzantine ZOO Limited | Other services | 2014 |
| C & a Commercial Limited | Wholesale & retail | 2026 |
| C & E Legal Solutions Ltd | Professional & scientific | 2019 |
| C & L Autos Ltd | Wholesale & retail | 2017 |
| C & R Accounts Ltd | Professional & scientific | 2025 |
| C & R Kitchens Ltd | Manufacturing | 2015 |
| C B ENDO1318 Ltd | Health & social care | 2021 |
| C Gibson Properties Limited | Real estate | 2025 |
| C H Controls Limited | Construction | 2021 |
| C J Goss Limited | Extraterritorial | 1962 |
| C J Hammond Builders Limited | Construction | 2005 |
| C J R Management Limited | Professional & scientific | 1990 |
| C M Tutoring Ltd | Administrative & support | 2021 |
| C T Pinnacle Ltd | Administrative & support | 2026 |
| C&D Drivers Limited | Transport & logistics | 2018 |
| C&K Kitchens & Bathrooms Ltd | Construction | 2023 |
| C&M Prime Properties Ltd | Real estate | 2024 |
| C&T Investment (PVT) Ltd | Real estate | 2026 |
| C-Lynx Services Ltd | Professional & scientific | 2002 |
| C-Lynx Services SPV Ltd | Real estate | 2026 |
| C. D. Jones Electrical Contractors Limited | Construction | 2022 |
| C.A.T 13 Limited | Wholesale & retail | 2013 |
| C.H. Morgan & Co. Limited | Wholesale & retail | 1975 |
| C4 Mechanical Ltd | Construction | 2024 |
| Cabin Haddenham Ltd | Hospitality | 2021 |
| Cabjoy Limited | Transport & logistics | 2025 |
| Cabow Limited | Administrative & support | 2012 |
| Cabs Direct 24/7 Ltd | Transport & logistics | 2024 |
| Cachet Commercial & Residential Ltd | Construction | 2024 |
| Cacique Investments Limited | Extraterritorial | 2017 |
| Cackling Witch Properties Limited | Real estate | 2021 |
| Cadien Limited | Health & social care | 2017 |
| Cadman Solutions Ltd | Information & communication | 2014 |
| Caerus Property Services Limited | Real estate | 2016 |
| Caesar Global Ltd | Real estate | 2022 |
| Cafe and Cakes Ltd | Hospitality | 2022 |
| Cafe Encore Limited | Hospitality | 2026 |
| Caflon Limited | Manufacturing | 1998 |
| Caht Electrical Ltd | Construction | 2021 |
| CAJ Cameo Ltd | Real estate | 2023 |
| Cake by Sugu Ltd | Hospitality | 2020 |
| Calabria Properties LLP | | 2020 |
| Calbridge Carshalton Ltd | Information & communication | 2015 |
| Caldecotte Group Limited | Construction | 2014 |
| Caldecotte Group Services Limited | Construction | 2017 |
| Calderion Ltd | Wholesale & retail | 2026 |
| Calderpips Music Ltd | Manufacturing | 2025 |
| Caldicott Consulting Ltd | Information & communication | 2023 |
| Calenzo Limited | Wholesale & retail | 2025 |
| Calibrate Accounting Limited | Professional & scientific | 2021 |
| Calibre Audio | Information & communication | 1983 |
| Calibre Quality Care Ltd | Professional & scientific | 2018 |
| Caliburnus Industries Limited | Professional & scientific | 2024 |
| Call Care for YOU Ltd | Health & social care | 2024 |
| Call ME Clean Ltd | Administrative & support | 2026 |
| Callguard 360 Limited | Information & communication | 2026 |
| Calliscribe Ltd | Wholesale & retail | 2025 |
| Callunad Ltd | Wholesale & retail | 2021 |
| CAM Concepts Ltd | Professional & scientific | 2014 |
| Camacom Productions Limited | Professional & scientific | 2015 |
| Camborne Limited | Real estate | 2019 |
| Camcapitis Limited | Real estate | 2020 |
| Camdollz Limited | Arts & recreation | 2025 |
| Camerons (AY) Limited | Transport & logistics | 2024 |
| Camerons Executive Cars Limited | Transport & logistics | 2015 |
| Camo Recruitment Ltd | Administrative & support | 2025 |
| Campaniafelix Ltd | Wholesale & retail | 2020 |
| Campion Group Ltd | Financial services | 2023 |
| Camscan Limited | Wholesale & retail | 2023 |
| Camy Healthcare Ltd | Transport & logistics | 2022 |
| Camy MED Ltd | Health & social care | 2016 |
| Cancelada Consultants Ltd | Financial services | 2008 |
| Candle Car Wash Limited | Administrative & support | 2025 |
| Candy Shack Beauty Ltd | Other services | 2019 |
| Cane RAT Spirits Limited | Manufacturing | 2020 |
| Canine Kitchen Limited | Other services | 2016 |
| Cannon Commercial Body Repair Ltd. | Wholesale & retail | 2013 |
| Canny Portal Limited | Information & communication | 2025 |
| Canonical Limited | Information & communication | 2004 |
| CAP Worldwide Limited | Administrative & support | 2016 |
| Capital G.E.M.S Ltd | Professional & scientific | 2024 |
| Capital News Group Ltd | Wholesale & retail | 2025 |
| Capital Roofing & Decorating Ltd | Construction | 2026 |
| Capstone Circle Ltd | Other services | 2025 |
| Capstone Learning Hub Ltd | Education | 2020 |
| Captain Mack Ltd | Information & communication | 2007 |
| CAPTIV8 Life Ltd | Health & social care | 2024 |
| Captive VFX Limited | Information & communication | 2019 |
| Capture-Me Photobooths Limited | Other services | 2022 |
| Capxion AI Ltd | Information & communication | 2024 |
| Car Kultur Ltd | Wholesale & retail | 2026 |
| Caramel Care Services Limited | Health & social care | 2026 |
| Carbon Free 2030 Energy Limited | Construction | 2022 |
| Carbon Press Ltd | Information & communication | 2025 |
| Cardinal Comms Ltd | Information & communication | 2016 |