| Butlers Building Services Limited | Construction | 2006 |
| Butterscotch 316 Limited | Administrative & support | 2011 |
| Buttnaked Drinks Limited | Administrative & support | 2009 |
| Button Factory Visual Effects Ltd | Information & communication | 2018 |
| Button House Nursery Limited | Education | 2026 |
| Buzz Connections Limited | Information & communication | 2017 |
| Buzz Events Limited | Wholesale & retail | 2025 |
| Buzz Kitchen 1 Limited | Wholesale & retail | 2025 |
| BVG Virtual Ltd | Administrative & support | 2020 |
| BY JK Ltd | Professional & scientific | 2013 |
| Bycrundwell Limited | Extraterritorial | 1957 |
| Byte Club Limited | Information & communication | 2024 |
| Bytesearch Ltd | Administrative & support | 2025 |
| Bádlight Consultancy Ltd | Professional & scientific | 2025 |
| C & DM Limited | Administrative & support | 2008 |
| C & J Homes Limited | Real estate | 2018 |
| C & M Property Investments Ltd | Real estate | 2002 |
| C B Leather Limited | Manufacturing | 2003 |
| C Daniels Financial Services Ltd | Professional & scientific | 2019 |
| C J Harding Design Limited | Professional & scientific | 2024 |
| C Line Tunbridge Wells Ltd | Transport & logistics | 2023 |
| C S Couriers Limited | Transport & logistics | 2011 |
| C W Apartments Limited | Households | 2021 |
| C&Cd Limited | Financial services | 2021 |
| C&F Brind Limited | Information & communication | 2020 |
| C&O Recycling Logistics Ltd | Water & waste | 2026 |
| C-Ll-Ct-V-Ly Ltd | Information & communication | 2015 |
| C-Rai Logistics Ltd | Transport & logistics | 2025 |
| C.M.S.Investments Limited | Real estate | 1970 |
| C.N Stone Property Development Ltd | Construction | 2023 |
| C.Piper Fine Decorating Ltd | Construction | 2021 |
| C3 Investments Ltd | Financial services | 2020 |
| C4C Community Interest Company | Professional & scientific | 2019 |
| C9VAPES Ltd | Wholesale & retail | 2023 |
| Cabs Corner Limited | Transport & logistics | 2024 |
| Cactus Digital Ltd | Information & communication | 2011 |
| Cactus Innovations Ltd | Information & communication | 2022 |
| Cadeprint Ltd | Administrative & support | 2018 |
| Caekcraft Software and Design Limited | Information & communication | 2010 |
| Caerus Consult Ltd | Professional & scientific | 2013 |
| Caffyns Cottages Management (Handcross) Limited | Real estate | 2006 |
| Cafg Ltd | Professional & scientific | 2021 |
| Cafjen Solutions Limited | Professional & scientific | 2020 |
| Cala Nexus Ltd | Professional & scientific | 2026 |
| Calder PR Ltd | Information & communication | 2016 |
| California Rotisserie Kitchen Ltd | Hospitality | 2020 |
| Calisseum Ltd | Information & communication | 2021 |
| Callidas Collective Ltd | Construction | 2022 |
| Callidas Construction Consultancy Ltd | Construction | 2017 |
| Callog Limited | Information & communication | 1985 |
| Calverley Court Management Limited | Professional & scientific | 1978 |
| Calverley Heights Limited | Households | 2007 |
| Calverley Homes Limited | Financial services | 2026 |
| Calverley Interiors Limited | Extraterritorial | 2020 |
| Calverley Limited | Wholesale & retail | 2004 |
| Calverley Park Mews Limited | Households | 2022 |
| Calvermont Ltd | Professional & scientific | 2018 |
| Calyx Cotton Limited | Agriculture & fishing | 2021 |
| Camb Consulting Limited | Administrative & support | 2026 |
| Camberlee Ltd | Real estate | 2024 |
| Camden 995 Ltd | Financial services | 2012 |
| Camden Barber Shop Ltd | Other services | 2025 |
| Camden Eleven Limited | Hospitality | 2018 |
| Camden Food Bazar Ltd | Wholesale & retail | 2023 |
| Camden Mini Store Ltd | Wholesale & retail | 2024 |
| Camden Park Limited | Households | 2009 |
| Camellia Landscaping Ltd | Administrative & support | 2024 |
| Cameron Collective Ltd | Other services | 2017 |
| Cameron Property & Partners Ltd | Real estate | 2025 |
| Camicks Brands Ltd | Wholesale & retail | 2024 |
| Camoptica Consulting Ltd | Information & communication | 2019 |
| Campaign for an Independent England Ltd | Other services | 2013 |
| Campaign for Public Infrastructure Limited | Other services | 2023 |
| Camrow Engineering Ltd | Professional & scientific | 2021 |
| Camvale Ltd | Manufacturing | 2019 |
| Candid Planning Consultancy Limited | Professional & scientific | 2023 |
| Cannella Machinery Group Limited | Manufacturing | 2020 |
| Cantuccio Ltd | Hospitality | 2023 |
| Canvas Restaurant Limited | Hospitality | 2024 |
| Capacityiq Limited | Information & communication | 2014 |
| Capel Containers Limited | Transport & logistics | 2023 |
| Capel Storage Limited | Transport & logistics | 2024 |
| Capital Debt Collections Ltd | Administrative & support | 2026 |
| Capital Exploration Ventures Limited | | 1984 |
| Capital Kingdom Ltd | Real estate | 2025 |
| Capital Mobile Tyres Ltd | Wholesale & retail | 2025 |
| Capital Plastic Surgery Assets LLP | | 2015 |
| Capital Plastic Surgery Limited | Health & social care | 2015 |
| Capital Tyres T W Ltd | Wholesale & retail | 2024 |
| Capricorn Consulting and Coaching Ltd | Professional & scientific | 2025 |
| Capsoft Ltd | Information & communication | 2024 |
| Capvise Ltd | Professional & scientific | 2025 |
| Car Sales Rotherfield Limited | Wholesale & retail | 2017 |
| Caracol Camping Ltd | Hospitality | 2022 |
| Carbontea Ltd | Information & communication | 2023 |
| Carcosa Consulting Services Ltd | Information & communication | 2025 |
| Cardboard Ltd | Professional & scientific | 2012 |
| Carden Services Ltd | Construction | 2017 |
| Cardinham Consulting Limited | Professional & scientific | 2025 |
| Cardwell Properties Limited | Real estate | 2013 |