| Bubble Lounge Spa Ltd | Other services | 2026 |
| Buchanan Coachcraft Ltd | Wholesale & retail | 2014 |
| Buckden Partners Corporate Finance Limited | Administrative & support | 2026 |
| Bucklersbury Estates Limited | Real estate | 2015 |
| Bucklersbury Hitchin Limited | Real estate | 2025 |
| Bucklersbury Limited | Real estate | 2021 |
| Bucklersbury Periperi Original Ltd | Hospitality | 2026 |
| Budare London Ltd | Manufacturing | 2020 |
| Buddies Wraparound Care Limited | Education | 2019 |
| BUG and Doodle Limited | Education | 2019 |
| Build Complete Ltd | Manufacturing | 2025 |
| Build Creative Construction Limited | Construction | 2023 |
| Build-A-Bond Therapeutic Interventions CIC | Education | 2026 |
| Building and Technology Systems Ltd | Construction | 2006 |
| Building Plastics (UK) Limited | Extraterritorial | 2008 |
| Bulldesign Studio Ltd | Professional & scientific | 2020 |
| Bullion Supermarket Limited | Wholesale & retail | 2019 |
| Bullocks 1 Limited | Administrative & support | 2011 |
| Bump PR Limited | Professional & scientific | 2010 |
| Burbury Street Surgery Limited | Health & social care | 2012 |
| Burch Aviation Services Ltd | Transport & logistics | 2008 |
| Bureau Floyd Limited | Real estate | 2016 |
| Burgess Properties Limited | Construction | 1958 |
| Burghill Houses Limited | Construction | 2021 |
| Burghley Properties Limited | Households | 2016 |
| Burogloo Ltd | Professional & scientific | 2007 |
| Burton Gardens Hitchin Ltd | Households | 2018 |
| Burton Residential Surveyors Ltd | Professional & scientific | 2019 |
| Bury Foxall Consulting Ltd | Information & communication | 2026 |
| Bury Mead Ltd | Real estate | 2025 |
| Business Marketing Online Limited | Information & communication | 2008 |
| Business Wealth Experts Ltd | Professional & scientific | 2025 |
| Button Monkey Productions Ltd | Information & communication | 2016 |
| Buzz Films Ltd | Information & communication | 2010 |
| Buzzway Advertising Limited | Professional & scientific | 2026 |
| BV Brands Ltd. | Wholesale & retail | 2016 |
| BV Tech Ventures Ltd | Information & communication | 2026 |
| BY Yulia ANN Limited | Administrative & support | 2024 |
| Byrneit Limited | Information & communication | 2017 |
| Bzlc Hospitality Ltd | Hospitality | 2025 |
| C B Commercial Services Limited | Professional & scientific | 2016 |
| C Cubed Fundraising Limited | Administrative & support | 2008 |
| C Hobbs Plumbing and Heating Ltd | Construction | 2017 |
| C Morgan Holdings Limited | Real estate | 2026 |
| C V N Homes Ltd | Real estate | 2022 |
| C&C Ferrars Road Limited | Construction | 2021 |
| C&C Station Road Limited | Construction | 2021 |
| C-Suite & Elite Coaching and Consulting Ltd | Professional & scientific | 2024 |
| C.B.K Utilities Ltd | Construction | 2021 |
| C.K. FRY Limited | Hospitality | 2024 |
| C.M. Battle Limited | Construction | 2003 |
| Cabenco Facilities Ltd | Administrative & support | 2010 |
| Cabenco Limited | Administrative & support | 2008 |
| Caddow Consulting Limited | Professional & scientific | 2015 |
| CAE Welcomes Limited | Professional & scientific | 2025 |
| Cafe Seventy Seven Ltd | Hospitality | 2020 |
| Cahill Process Solutions Limited | Information & communication | 2019 |
| Cain Markings Limited | Administrative & support | 2020 |
| Cairngorm View Limited | Hospitality | 2023 |
| Calculate Recruitment Limited | Administrative & support | 2017 |
| Caldicott Court Residents Management Company Limited | Households | 2006 |
| Calendar Go Limited | Information & communication | 2025 |
| Calibre Roofing Specialists Ltd | Construction | 2021 |
| Call Handling Services Limited | Administrative & support | 1991 |
| Calm in Colour Ltd | Health & social care | 2024 |
| Calms Psychology Limited | Health & social care | 2025 |
| Caltex Properties Ltd | Real estate | 2018 |
| Cambourne Consulting Ltd | Professional & scientific | 2016 |
| Cambridge Alumni Tours Ltd. | Administrative & support | 2014 |
| Cambridge Heath Limited | Real estate | 2023 |
| Cambridge Luxury Bakes Ltd | Wholesale & retail | 2022 |
| Cambridge Metal Roofing Ltd | Construction | 2023 |
| Camden Chase Ltd | Real estate | 2020 |
| Camden Consulting Ltd | Professional & scientific | 2010 |
| Cameron & Partners Limited | Professional & scientific | 2026 |
| Cameron Capital Investment Ltd | Financial services | 2023 |
| Camilla Consultancy Ltd | Information & communication | 2023 |
| Camisys Limited | Information & communication | 2025 |
| Camp & Co Developments Limited | Construction | 2021 |
| Camp & Co Holdings Limited | Real estate | 2021 |
| CAN Capital Investments Limited | Financial services | 2023 |
| CAN WE Discuss ? Limited | Information & communication | 2022 |
| Candent Consulting Limited | Professional & scientific | 2019 |
| Canonburysq Limited | Real estate | 2026 |
| Cantina Kiosk Limited | Hospitality | 2023 |
| Capa Accounting Services Ltd | Professional & scientific | 2019 |
| Cape-Eden Ltd | Wholesale & retail | 2021 |
| Capioca Limited | Information & communication | 2012 |
| Capital Caboodle Limited | Wholesale & retail | 2020 |
| Capital Contractors South East Ltd | Construction | 2023 |
| Capital Energy Consulting Ltd | Professional & scientific | 2018 |
| Capriole Consulting Limited | Professional & scientific | 2023 |
| Captain Jack Sparrow Limited | Extraterritorial | 2013 |
| Car Supermarket Limited | Wholesale & retail | 2023 |
| Caravan Media Limited | Information & communication | 2014 |
| Carbon Minded Limited | Professional & scientific | 2013 |
| Carculator Limited | Extraterritorial | 2021 |
| Cardio-Iasis Ltd | Health & social care | 2025 |
| Cardona & SON Limited | Financial services | 2020 |
| Care 4 YOU Direct Limited | Health & social care | 2020 |