| BTM Centre Ltd | Health & social care | 2024 |
| Bubbleworldb&E Ltd | Manufacturing | 2019 |
| Builders Merchants (Wimbledon) Limited | Real estate | 1950 |
| Buildmaster Development London Limited | Construction | 2024 |
| Burghley Partnership Ltd | Real estate | 2023 |
| Burghley Services Ltd | Professional & scientific | 2025 |
| Burlington Cafe Ltd | Hospitality | 2023 |
| Burrito & Co. Limited | Hospitality | 2018 |
| Burton Lodge (Freehold) Limited | Households | 2013 |
| Business AS Usual Services Ltd | Information & communication | 2008 |
| Business Growth Insight Limited | Information & communication | 2023 |
| Business Information Technology Enterprise Solutions Limited | Information & communication | 2013 |
| Business Systems Limited | Information & communication | 1981 |
| Butterscotch Catering Limited | Hospitality | 2017 |
| Byiman Limited | Wholesale & retail | 2025 |
| Bymarie Limited | Manufacturing | 2025 |
| Byron Automation Ltd | Construction | 2025 |
| Byron Engineering Ltd | Professional & scientific | 2023 |
| C & V Tilers Ltd | Construction | 2021 |
| C Globe Traders Ltd | Manufacturing | 2013 |
| C J O Group Ltd | Financial services | 2024 |
| C&C Construct Ltd | Construction | 2022 |
| C&C Express Ltd | Transport & logistics | 2003 |
| C&C London Trading Ltd | Transport & logistics | 2014 |
| C&F Martins Services Limited | Administrative & support | 2026 |
| C.L.R.A. Limited | Real estate | 1993 |
| C2 Digital Solutions Ltd | Wholesale & retail | 2023 |
| Cabrio Systems Limited | Wholesale & retail | 2008 |
| Cadenza T Limited | Wholesale & retail | 2017 |
| Caenshill House Limited | Households | 2006 |
| Caenshill Management Limited | Households | 2001 |
| Cafe Hanok Ltd | Hospitality | 2023 |
| Cafe Kiko Limited | Hospitality | 1995 |
| Cafe Snow-In Ltd | Hospitality | 2015 |
| Caison Solutions Ltd | Professional & scientific | 2012 |
| Cakeflower Ltd | Hospitality | 2017 |
| Callumsnutritionacademy Ltd | Arts & recreation | 2026 |
| Callumyoungcoaching Ltd | Other services | 2025 |
| Calsnutrifit Ltd | Other services | 2024 |
| Calum Windeatt Ltd | Professional & scientific | 2025 |
| Cambridge International (GB) Ltd | Hospitality | 2013 |
| Cambural Limited | Real estate | 2025 |
| Camelot Mews Management Company Limited | Households | 2006 |
| Cameratina Ltd | Health & social care | 2022 |
| Candace Abroad Limited | Information & communication | 2023 |
| Candidrecruits Limited | Professional & scientific | 2017 |
| Canh Consultancy Ltd | Professional & scientific | 2025 |
| Canterbury ELM Tree Ltd | Manufacturing | 2020 |
| Capital AI Ltd | Professional & scientific | 2025 |
| Capital London Care Ltd | Health & social care | 2023 |
| Capital Wealth AG Ltd | Real estate | 2018 |
| Cappie MAX Limited | Real estate | 2022 |
| Capstone Construction U.K Ltd | Construction | 2009 |
| Car Hunt Plus Limited | Wholesale & retail | 2025 |
| Care Copilot Ltd | Information & communication | 2024 |
| Caribbestar Ltd | Wholesale & retail | 2025 |
| Carltons (Putney) Tenants Association Limited(The) | Households | 1963 |
| Carole Limited | Health & social care | 2015 |
| Carpetwise Contracts Limited | Construction | 1993 |
| Carrington ROW Ltd | Wholesale & retail | 2025 |
| Carrington Wood Limited | Real estate | 1999 |
| Carrominster Limited | Households | 1985 |
| Cascades Court Limited | Households | 2005 |
| Cashen Consultants Ltd | Professional & scientific | 2019 |
| Casmir Properties Limited | Real estate | 2001 |
| Cass Technologies Ltd | Information & communication | 2026 |
| Catalica Limited | Professional & scientific | 2022 |
| Catford & Cyphers Cricket Club Ltd | Arts & recreation | 2024 |
| Catherine Court Limited | Households | 1995 |
| Cavendish Court Residents Management Company Limited | Households | 2003 |
| Cavendish Place Residents' Company Limited | Households | 2001 |
| CC Consultancy Services Ltd | Information & communication | 2016 |
| CC Rentals Limited | Real estate | 2023 |
| CC Startups Ltd | Professional & scientific | 2021 |
| Ccmz Limited | Real estate | 2025 |
| CEC Academy London Ltd | Education | 2019 |
| Cecil Mansions (Management) Limited | Households | 1982 |
| Cedar Management Service Ltd | Real estate | 2024 |
| Cedar Park Management Company (Wimbledon) Limited | Households | 2006 |
| Cedralyn Ltd | Real estate | 2026 |
| Celebe London Ltd | Information & communication | 2023 |
| Celocom Ltd | Other services | 2010 |
| Central Road Investment Limited | Real estate | 2023 |
| Certified C Ltd | Administrative & support | 2023 |
| Ceylon Spice Imports Ltd | Wholesale & retail | 2026 |
| Ceymar Consultants Ltd | Administrative & support | 2014 |
| CG Conex Limited | Transport & logistics | 2010 |
| CGA Solutions Limited | Professional & scientific | 2025 |
| Cgconex TD Limited | Transport & logistics | 2014 |
| Cgehive Ltd | Extraterritorial | 2025 |
| CH Carriages Limited | Transport & logistics | 2017 |
| CHA House Ltd | Construction | 2018 |
| Chalcraft Hall Ltd | Health & social care | 2023 |
| Chalford Court (Putney Hill) Residents Association Limited | Households | 1961 |
| Cham Kimbap and Dosirak Limited | Hospitality | 2019 |
| Chamberlains Garage Limited | Wholesale & retail | 2015 |
| Chan Chan Chan Ltd | Hospitality | 2025 |
| Chancecroft Limited | Real estate | 1980 |
| Chanchal Limited | Real estate | 2021 |
| Change Your Energy | Health & social care | 2013 |