| Bspi 2 Limited | Real estate | 2023 |
| BTC Express Ltd | Transport & logistics | 2025 |
| Buckle Court RTM Company Limited | Real estate | 2012 |
| Bucks Storage Ltd | Transport & logistics | 2021 |
| Buddhist Village Trust for SRI Lanka | Health & social care | 2003 |
| Buddy Broadcast Ltd | Information & communication | 2020 |
| Build N Brush Ltd | Construction | 2025 |
| Builders DMP Ltd | Construction | 2025 |
| Buildify Constructions Ltd | Construction | 2025 |
| Building 4 U Limited | Construction | 2009 |
| Building Management London Ltd | Real estate | 2018 |
| Buildit Services Ltd | Construction | 2019 |
| Buildteamnorth Ltd | Construction | 2019 |
| Bull Lane MOT Station Ltd | Wholesale & retail | 2026 |
| Bullet Promotions Limited | Other services | 2018 |
| Bullhorn Consultants Limited | Information & communication | 2014 |
| Bumi Homeware Ltd | Other services | 2020 |
| Burger SHE Wrote Limited | Hospitality | 2020 |
| Burgess & Sons Limited | Construction | 2026 |
| Burnham RC Ltd | Real estate | 2022 |
| Burnstar Consultancy Limited | Administrative & support | 2009 |
| Burnstar Design Ltd | Administrative & support | 2011 |
| Burnstar Developments Limited | Real estate | 2009 |
| Bushbay Limited | Wholesale & retail | 2006 |
| Bushey Eruv Company Limited | Other services | 2015 |
| Busy Brown Bear Ltd | Information & communication | 2025 |
| Bute Services Ltd | Administrative & support | 2019 |
| Buxlow Preparatory School Limited | Education | 1958 |
| Buy and Smile Limited | Wholesale & retail | 2014 |
| Buy ME Gadgets Ltd | Wholesale & retail | 2024 |
| Buyhealthy Ltd | Wholesale & retail | 2025 |
| Buyweb Ltd | Wholesale & retail | 2014 |
| Buzika Power Ltd | Transport & logistics | 2025 |
| BV Group London Limited | Construction | 2022 |
| BV Patel Ltd | Wholesale & retail | 2025 |
| Bvjm Limited | Administrative & support | 2025 |
| BVR Consulting Limited | Professional & scientific | 2006 |
| BVT Consultants Limited | Professional & scientific | 2018 |
| BW Contractors Limited | Construction | 2020 |
| Byanka Refurbishment Solutions Ltd | Construction | 2014 |
| Byron Court Management (Swiss Cottage) Limited | Households | 1969 |
| Byron Recreation CIC | Education | 2026 |
| C & C Housing Ltd | Real estate | 2023 |
| C & J Experts Ltd | Administrative & support | 2015 |
| C & J Tiling Ltd | Construction | 2019 |
| C and M Land and Site Services Limited | Construction | 2018 |
| C G Knapton Limited | Wholesale & retail | 2013 |
| C I Transport Ltd | Transport & logistics | 2018 |
| C L Investments Holdings Ltd | Financial services | 2019 |
| C U Construction Ltd | Construction | 2014 |
| C&A Shah Limited | Real estate | 2018 |
| C&C Home Improvements (Holdings) Limited | Wholesale & retail | 2023 |
| C&K Top Tiles Ltd | Construction | 2019 |
| C&P Holdings Ltd | Wholesale & retail | 2019 |
| C. J. Management Limited | Real estate | 1991 |
| C.D &Construction Ltd | Construction | 2019 |
| C.M.E. Mechanical Ltd | Construction | 2019 |
| C2HSE Ltd | Construction | 2025 |
| C3 Alliance Limited | Wholesale & retail | 2018 |
| C4I Ltd | Information & communication | 2015 |
| C4L Properties Limited | Real estate | 2012 |
| CA Properties Limited | Construction | 2018 |
| Caan Limited | Real estate | 2014 |
| Caax Limited | Information & communication | 2014 |
| Cablegold Limited | Construction | 2002 |
| Cabmind Ltd | Information & communication | 2026 |
| CAD Designers Ltd | Wholesale & retail | 2010 |
| Caesium Capital Limited | Professional & scientific | 2020 |
| Cairo Limited | Wholesale & retail | 2020 |
| Calaris ARC Limited | Real estate | 2022 |
| Caldecote Properties Ltd | Real estate | 2016 |
| Callaghan Construction Limited | Construction | 2006 |
| Callan Partners Limited | Professional & scientific | 2018 |
| Callinan Coaches UK Limited | Transport & logistics | 2014 |
| Calmbray Properties Limited | Real estate | 1965 |
| CAM Brannagan Football Academy Limited | Arts & recreation | 2023 |
| CAM Heights Ltd | Construction | 2019 |
| Cambrai Court Management Company Limited | Households | 1968 |
| Cambridge ICT Solutions Ltd | Information & communication | 2011 |
| Cambridge International School Ltd. | Education | 2004 |
| Camden Lock Properties Ltd | Real estate | 2017 |
| Cammyleon Ltd | Real estate | 2025 |
| Campaign Crafters Limited | Information & communication | 2022 |
| Campbell Building Design Limited | Professional & scientific | 2011 |
| Campcrest Limited | Wholesale & retail | 2026 |
| Camy Services Ltd | Health & social care | 2016 |
| CAN Enterprises Limited | Real estate | 2021 |
| Canary South RTM Company Limited | Households | 2013 |
| Canary Yellow Ltd | Professional & scientific | 2012 |
| Candy Wharf RTM Company Ltd | Households | 2018 |
| Canons Cleaners Ltd | Other services | 2014 |
| Cantab Analytics Ltd | Manufacturing | 2025 |
| Canterbury Properties Limited | Real estate | 2008 |
| Capable Communities Limited | Administrative & support | 2010 |
| Cape Shark Consulting Limited | Professional & scientific | 2024 |
| Capital Automotive Limited | Wholesale & retail | 2014 |
| Capital Estate and Management Limited | Real estate | 2025 |
| Capital People London Limited | Administrative & support | 2018 |
| Capital PM Services Limited | Professional & scientific | 2011 |
| Capital Properties and Ventures Ltd | Construction | 2024 |