| Burnin Music Ltd | Information & communication | 2013 |
| Burntwood Capital Ltd | Real estate | 2013 |
| Bury Motor Company Limited | Wholesale & retail | 2013 |
| Busari Group Limited | Financial services | 2023 |
| Busari Technology Limited | Information & communication | 2022 |
| Business Interior Group Ltd | Construction | 2025 |
| Business Mums of Essex Ltd | Administrative & support | 2025 |
| Business Reset Group Ltd | Professional & scientific | 2023 |
| Business Synergies Limited | Agriculture & fishing | 2008 |
| Businesses International London Ltd | Water & waste | 2021 |
| Busy Doctors Film Productions Ltd | Information & communication | 2011 |
| Busy Doctors Ltd | Health & social care | 2013 |
| Butia Design and Build Ltd | Construction | 2024 |
| Butterflies Montessori School Limited | Education | 2009 |
| Bv&P Limited | Hospitality | 2020 |
| BW ISS Limited | Construction | 2025 |
| BY Cintillate Limited | Health & social care | 2023 |
| BY Nature Cleaning Services Ltd | Administrative & support | 2024 |
| BY Nomi Limited | Administrative & support | 2025 |
| BY Sultan B Ltd | Other services | 2023 |
| Bydzine Ltd | Professional & scientific | 2024 |
| Bywood Trading Ltd | Financial services | 2017 |
| C & L Mccrae Limited | Health & social care | 2011 |
| C a S Civils Ltd | Construction | 2019 |
| C Ford Accountancy Services Ltd | Professional & scientific | 2025 |
| C White Trading Limited | Wholesale & retail | 2010 |
| C Winkworth Financial Services Ltd | Professional & scientific | 2019 |
| C&B Accounting Ltd | Professional & scientific | 2012 |
| C&K Proservices Ltd | Construction | 2016 |
| C-Mase Limited | Information & communication | 2012 |
| C. Day & SON Limited | Construction | 1999 |
| C.D.S. Secretaries Ltd | Transport & logistics | 2019 |
| C.I.F Professional Carpentry Ltd | Construction | 2019 |
| C.I.Z Consulting Limited | Administrative & support | 2009 |
| C.P Contracts Ltd | Construction | 2021 |
| C3 Print Group Limited | Manufacturing | 2003 |
| C360 (I.P.) Limited | Other services | 2013 |
| C360 (View) Limited | Administrative & support | 2013 |
| C6 Trading Ltd | Wholesale & retail | 2023 |
| CAB Call 24/7 Ltd | Transport & logistics | 2015 |
| Cabgleam Ltd | Wholesale & retail | 2025 |
| Cabrmi Properties Limited | Real estate | 2026 |
| Cabros Restaurant Limited | Hospitality | 2025 |
| CAD Services London Limited | Construction | 2013 |
| Cadrify Ltd | Information & communication | 2026 |
| Cafe Delight Limited | Hospitality | 2026 |
| Cali Collectibles Ltd | Wholesale & retail | 2026 |
| Calin Cleaner Ltd | Administrative & support | 2024 |
| Callaghan Marquees Limited | Administrative & support | 2015 |
| Callum Jones Editing Ltd | Information & communication | 2024 |
| Callyn Ltd | Financial services | 2024 |
| Cambridge Dental Practice Limited | Health & social care | 2007 |
| Camiel Care Services Limited | Health & social care | 2011 |
| Camilla Shop Ltd | Wholesale & retail | 2023 |
| Campion Rugby Football Club Limited | Arts & recreation | 2017 |
| Camrex House Ltd | Real estate | 2017 |
| Cana UK Construction Limited | Construction | 2024 |
| Candomble Nago Ogun Onire/Jurema Pena Azul Ltd | Other services | 2025 |
| Cane & Able Spirits Limited | Wholesale & retail | 2019 |
| Cannon James Limited | Administrative & support | 2025 |
| Canons Brook Limited | Real estate | 2025 |
| Canterbury Theatre School LLP | | 2026 |
| Cantua Contracting Limited | Extraterritorial | 2018 |
| CAP and Feathers Ltd | Hospitality | 2022 |
| Capel Dental Limited | Health & social care | 2007 |
| Capital Electrical Solutions Ltd | Energy | 2023 |
| Capital GAS Services Ltd | Construction | 2014 |
| Capital Holdings JDM Group Ltd | Real estate | 2021 |
| Capital Site Solutions Limited | Construction | 2020 |
| Capra Consulting Ltd | Professional & scientific | 2019 |
| Capra Services Limited | Construction | 2018 |
| Capricorn Homes Ltd | Real estate | 2022 |
| Capsa London Ltd | Professional & scientific | 2020 |
| Captain of Your Ship Ltd | Education | 2026 |
| Captinova Ltd | Professional & scientific | 2025 |
| Car Autodirect Ltd | Wholesale & retail | 2025 |
| Car Clearance Trade Centre Ltd | Wholesale & retail | 2015 |
| Car Sound Security Limited | Wholesale & retail | 2014 |
| Carbonmeta Research Ltd | Manufacturing | 2021 |
| Card Grind Limited | Wholesale & retail | 2025 |
| Cardrome Bike Training Limited | Education | 2020 |
| Cardrome Vehicle Solutions Limited | Extraterritorial | 2005 |
| Care 4 U (C4U) Ltd | Health & social care | 2021 |
| Care Certificate Company Ltd | Extraterritorial | 2024 |
| Care Decorators Ltd | Construction | 2024 |
| Care Onus Ltd | Health & social care | 2017 |
| Career Workouts Limited | Professional & scientific | 2011 |
| Carelink Digital Ltd | Health & social care | 2026 |
| Caremile Consultancy Ltd | Administrative & support | 2020 |
| Careview Medical Group Ltd | Real estate | 2022 |
| Carework Compass Limited | Administrative & support | 2025 |
| Caring Haven Homes Ltd | Public administration | 2024 |
| Carl Burch Accounting Limited | Professional & scientific | 2018 |
| Carm Associates Ltd | Professional & scientific | 2014 |
| Carnforth House Freehold Limited | Households | 2013 |
| Carol Oakley Productions Ltd | Information & communication | 2015 |
| Carpet & Flooring House Ltd | Wholesale & retail | 2023 |
| Carpet Solutions and Flooring Ltd | Construction | 2023 |
| Carr Family Investments Limited | Real estate | 2024 |
| Carraman Limited | Transport & logistics | 2019 |