| Brightcherry Limited | Information & communication | 2013 |
| Brightlink Solutions Ltd | Professional & scientific | 2024 |
| Brightside Installations Limited | Construction | 2014 |
| Brightway Hub Limited | Energy | 2024 |
| Britaway Limited | Wholesale & retail | 2013 |
| Broadway Electrical Services Ltd | Wholesale & retail | 1974 |
| Broadway Lane Investments Ltd | Households | 2024 |
| Brockleside Limited | Households | 1979 |
| Brogan's QS & Commercial Management Limited | Professional & scientific | 2017 |
| Bromley Lane Investments Limited | Financial services | 2003 |
| Brontide Consulting Ltd | Professional & scientific | 2013 |
| Brookeaster Limited | Professional & scientific | 2015 |
| Brookhouse Place Management Ltd | Households | 1998 |
| Brookhurst Capital Limited | Financial services | 2018 |
| Brooqs Projects Ltd | Professional & scientific | 2023 |
| Browne Construction Limited | Construction | 2012 |
| Brownstone Building Services Ltd | Construction | 2015 |
| Brownstone Design & Build Ltd | Construction | 2026 |
| Brownstone Property Developments Ltd | Real estate | 2025 |
| Brse Solutions Ltd | Construction | 2018 |
| Bruford & Heming Limited | Wholesale & retail | 1970 |
| Bruz Packs Limited | Professional & scientific | 2014 |
| Bsca Partners UK Limited | Professional & scientific | 2024 |
| BSH Financial Services Consulting Ltd | Professional & scientific | 2023 |
| BSN Planning Ltd | Professional & scientific | 2025 |
| Bsrfc Trading Ltd | Arts & recreation | 2015 |
| BT Cricket Academy Ltd | Education | 2025 |
| BTB Acquisitions Ltd | Construction | 2024 |
| BTC British Trade Company Limited | Wholesale & retail | 2020 |
| BTL Building & Landscaping Ltd | Construction | 2026 |
| BTS Digital Ltd | Information & communication | 2013 |
| BTS Maintenance Ltd | Manufacturing | 2020 |
| Btzt Ltd | Transport & logistics | 2024 |
| Bubbles & Breathe Swim School Ltd | Arts & recreation | 2023 |
| Bulgarian Fellowship | Administrative & support | 2019 |
| Bumperstops Ltd. | Manufacturing | 2000 |
| Bunhill Research and Trading Ltd | Professional & scientific | 2021 |
| Bunting Homes Ltd | Real estate | 2024 |
| Burger Amour Bishop Stortford Limited | Hospitality | 2019 |
| Burgs Limited | Wholesale & retail | 2021 |
| Burley Property Investment Company Limited | Real estate | 1937 |
| Burnden Park Ltd | Real estate | 2018 |
| Burnden Park Partnership LLP | | 2021 |
| Burning Brands Limited | Professional & scientific | 2010 |
| Burr and Neve Quantity Surveyors Limited | Professional & scientific | 2020 |
| Burrito Grill Limited | Hospitality | 2019 |
| Burrow Residential Limited | Real estate | 2019 |
| Business Fitness Centre Limited | Professional & scientific | 1990 |
| Business Improvisers Limited | Professional & scientific | 2014 |
| Butterfly BEE Ltd | Construction | 2020 |
| Buttermere Real Estate Ltd | Real estate | 2025 |
| Buzz Supplies Holdings Limited | Financial services | 2026 |
| Buzz Supplies Ltd | Professional & scientific | 2009 |
| Bv-Uk Limited | Wholesale & retail | 2015 |
| BW Farr Ltd | Construction | 2026 |
| BWH Associates Ltd | Information & communication | 2026 |
| BY JAM Ltd | Information & communication | 2022 |
| BY Kayleigh Ltd | Education | 2024 |
| Byron Mews Freehold Limited | Households | 2004 |
| Byron Mews Residents (Hampstead) Limited | Households | 1994 |
| C & L Sterck Limited | Hospitality | 2018 |
| C P B Building Solutions Ltd | Construction | 2021 |
| C&H Groundworks Contracting Ltd | Construction | 2026 |
| C-Pad Limited | Professional & scientific | 2018 |
| C.P. Clothing Limited | Wholesale & retail | 2013 |
| Cabin Confidential Limited | Administrative & support | 2025 |
| Cactus Investments Ltd | Real estate | 2023 |
| Cactus Properties & Developments Ltd | Real estate | 2024 |
| Cadastra Group Limited | Extraterritorial | 2001 |
| Caden Property Development Group Limited | Construction | 2024 |
| Cadons (Facades) Ltd | Construction | 2021 |
| Cadre (Construction) Limited | Professional & scientific | 2025 |
| CAE Property Services Ltd | Construction | 2022 |
| Caint Ltd | Education | 2026 |
| Caistor Quarry Borehole Limited | Professional & scientific | 2012 |
| Calacus Public Relations Limited | Extraterritorial | 2008 |
| Caldervale Forge Works Limited | Extraterritorial | 2024 |
| Calista Consultancy Ltd | Professional & scientific | 2024 |
| Calla Lily Ltd | Wholesale & retail | 2021 |
| Callow Civils Limited | Construction | 2016 |
| Calsy Stickers, Signs and Designs Ltd | Professional & scientific | 2018 |
| CAM Hub Ltd | Wholesale & retail | 2025 |
| Cambridge Analytical (Consulting) Ltd. | Financial services | 2013 |
| Cambridge Research and Investment Consultants Ltd | Professional & scientific | 2012 |
| Cambridge Space Centre Limited | Administrative & support | 2018 |
| Cameron Communications (Training) Limited | Education | 2020 |
| Camlet Limited | Construction | 2003 |
| Camm Architects Limited | Professional & scientific | 2006 |
| Cammas Hall Partnership Limited | Energy | 2012 |
| Campbell Stewart Limited | Professional & scientific | 2025 |
| Candescence Nutrition Ltd | Health & social care | 2021 |
| Canfield Scott Limited | Administrative & support | 2018 |
| Capable Cat Limited | Information & communication | 2016 |
| Caper & Lark Ltd | Wholesale & retail | 2026 |
| Capintro Partners Limited | Financial services | 2007 |
| Capital & Provident Management Limited | Real estate | 1992 |
| Capital HB Ltd | Professional & scientific | 2026 |
| Capital Wise Property Investments Limited | Real estate | 2023 |
| Capricorn Centre (Dagenham) Limited | Administrative & support | 1989 |
| Carbon Descent International Ltd | Professional & scientific | 2012 |