| Burnham Court NW4 RTM Company Limited | Extraterritorial | 2010 |
| Burrows & SON Ltd | Construction | 2015 |
| Burton Court (N11) RTM Company Limited | Households | 2019 |
| Bushey Gate (Management) Ltd | Administrative & support | 2010 |
| Bushey Hall Road Management (NO. 1) Ltd. | Households | 1992 |
| Bushey Hall Road Management (NO.2) Limited | Households | 1993 |
| Bushstone Construction Limited | Construction | 2014 |
| Business Fundamentals Limited | Professional & scientific | 2003 |
| Business Orchard Holdings Ltd | Financial services | 2024 |
| Business Orchard LLP | | 2014 |
| Business Services and Management Ltd | Professional & scientific | 2019 |
| Business Woman Today Limited | Information & communication | 2018 |
| Busters Catering Limited | Hospitality | 2000 |
| Butch FX Ltd | Professional & scientific | 2023 |
| Butcher BOY Barber Ltd | Other services | 2019 |
| Butcher Butler Ltd | Wholesale & retail | 2026 |
| Buttah London Ltd | Manufacturing | 2024 |
| Button & Button Ltd | Arts & recreation | 2023 |
| Button Media Consulting LLP | | 2022 |
| Buzzeebee Limited | Information & communication | 2025 |
| BV Connect Ltd | Construction | 2023 |
| BW Pase Limited | Other services | 2010 |
| Bwood Builders Ltd | Administrative & support | 2022 |
| Bwood Construction Services Ltd | Construction | 2017 |
| Bwood Group Limited | Households | 2022 |
| Bwood Renewable Energy Ltd | Construction | 2024 |
| BY Construction (London) Limited | Construction | 2024 |
| BY Construction (London) Two Limited | Construction | 2026 |
| BY Design (108 Heath Street) Ltd | Real estate | 2021 |
| BY Design (Imperial Court) Limited | Construction | 2025 |
| BY Design (Spencer Walk) Limited | Construction | 2023 |
| BY JAY Services Ltd | Administrative & support | 2024 |
| Byran Consulting Ltd | Professional & scientific | 2024 |
| Byran Healthcare Limited | Health & social care | 2018 |
| Byran Holdings Limited | Financial services | 2024 |
| Byren Holdings Limited | Financial services | 2014 |
| Byren Investments Limited | Financial services | 2014 |
| Byren Ltd | Real estate | 2013 |
| Byren Technologies Limited | Information & communication | 2014 |
| Byzanti Ltd | Real estate | 2025 |
| BZ Solutions Ltd | Construction | 2022 |
| C & J Trade Ltd | Wholesale & retail | 2012 |
| C & P (York House) Limited | Real estate | 2019 |
| C & S Plastering (UK) Limited | Construction | 2007 |
| C C Hathaway TV and Film Services Limited | Information & communication | 2022 |
| C F Services (Midlands) Limited | Construction | 2017 |
| C J Smiths Builders Limited | Construction | 2016 |
| C Kidd Holdings Limited | Financial services | 2026 |
| C Landmarks LLP | | 2010 |
| C Money Exchange Ltd | Financial services | 2024 |
| C&A Iftimie Ltd | Transport & logistics | 2018 |
| C&C Auto Gallery Ltd | Wholesale & retail | 2019 |
| C&R Contract Flooring Services Ltd | Construction | 2025 |
| C&R Logistics Ltd | Manufacturing | 2019 |
| C. Baldock Construction Limited | Administrative & support | 2024 |
| C.C. Creative Consultancy Ltd | Information & communication | 2020 |
| C.Harris(Wholesale Meat)Limited | Manufacturing | 1965 |
| C.J. (UK) Limited | Wholesale & retail | 1991 |
| C3 Properties Limited | Construction | 2013 |
| CA Infrastructure Limited | Construction | 2025 |
| CA Kent Limited | Real estate | 2010 |
| CA Trade & Supply Ltd | Wholesale & retail | 2025 |
| CAA Tech Limited | Information & communication | 2013 |
| Cabin Air Sensor Solutions Limited | Administrative & support | 2013 |
| Cabvision Capital Limited | Administrative & support | 2010 |
| Cabvision Limited | Professional & scientific | 1999 |
| Cabvision Network Limited | Transport & logistics | 2010 |
| Cacao Bean Restaurant Limited | Hospitality | 2021 |
| Cacao Catering & Events Limited | Hospitality | 2018 |
| Cactus Collective Ltd | Professional & scientific | 2025 |
| CAD (London) Limited | Other services | 2017 |
| Cadmate Ltd | Information & communication | 2017 |
| Caerus Digital Media Ltd | Professional & scientific | 2020 |
| Cafe' Noir (London) Limited | Hospitality | 2014 |
| Cagri Fence UK Ltd | Wholesale & retail | 2024 |
| Cahfcah Limited | Information & communication | 2007 |
| Cahusac Limited | Arts & recreation | 2023 |
| Cakebox (Poplar) Ltd | Wholesale & retail | 2016 |
| Calc Consultancy Ltd | Professional & scientific | 2023 |
| Calcott Securities Limited | Real estate | 1998 |
| Calic Consulting Limited | Professional & scientific | 2015 |
| California Building Limited | Construction | 2017 |
| CALL2ACTIONSERVICES Limited | Professional & scientific | 2016 |
| Callia Logistics Ltd | Transport & logistics | 2025 |
| Callisto Technologies Limited | Transport & logistics | 2018 |
| Cally Marriage Productions Ltd | Information & communication | 2024 |
| Calmfind Ltd | Health & social care | 2023 |
| Calmia UK Ltd | Administrative & support | 2007 |
| Calvercare Limited | Health & social care | 1994 |
| Cambr Limited | Real estate | 1988 |
| Cambridge CG Ltd | Professional & scientific | 2014 |
| Cambridge Renovations Limited | Construction | 2014 |
| Camden Centre Investment Ltd | Real estate | 2019 |
| Camden H Street Ltd | Real estate | 2018 |
| Camden Town Properties Limited | Construction | 2014 |
| Cammas Homes Limited | Real estate | 2021 |
| Camp Oneder Ltd | Health & social care | 2023 |
| Cana Oasis Ltd | Health & social care | 2014 |
| Canales Advisory Services Limited | Administrative & support | 2024 |
| Candage Logistics LLP | | 2016 |