| Audley Chaucer Limited | Professional & scientific | 2017 |
| Aureum Advisory Ltd | Professional & scientific | 2016 |
| Aurum Vitae Limited | Manufacturing | 2025 |
| Autovogue Global Ltd | Administrative & support | 2010 |
| Autovogue Training School Ltd | Administrative & support | 2010 |
| Autovogue Transport Limited | Administrative & support | 2018 |
| Autovogue Vehicle Collection Ltd | Administrative & support | 2010 |
| Avandra Escapes LLP | | 2025 |
| Averna Restaurant Ltd | Hospitality | 2026 |
| AVI Technology Ltd | Information & communication | 2017 |
| Avington Group Ltd | Financial services | 2026 |
| Avington North West Limited | Extraterritorial | 2016 |
| Avita Consulting Ltd | Information & communication | 2018 |
| Awhn Investments (CL) Limited | Real estate | 2026 |
| Awhn Investments Limited | Real estate | 2025 |
| AWT Holdco Ltd | Financial services | 2025 |
| Axxent Limited | Information & communication | 2025 |
| Axxent Technologies Ltd | Information & communication | 2026 |
| Azeus UK Limited | Administrative & support | 2010 |
| B2D Ltd. | Information & communication | 2018 |
| Babble and Hemp Ltd. | Wholesale & retail | 2018 |
| Bacchus Wine Auctions Limited | Wholesale & retail | 2016 |
| Backbeat Leather Ltd | Manufacturing | 2026 |
| Bafijo Ltd | Professional & scientific | 2026 |
| Bahar Bridge Ltd | Professional & scientific | 2024 |
| Baird Solutions Limited | Information & communication | 2023 |
| Bala Projects Ltd | Information & communication | 2018 |
| Balance Financial Planning Limited | Professional & scientific | 2015 |
| Balls Brake Consulting Limited | Professional & scientific | 2016 |
| Bamboo Events Ltd | Administrative & support | 2004 |
| Bamboo Living Ltd | Real estate | 2018 |
| Banking Loyalty Limited | Information & communication | 2018 |
| Bariss Limited | Real estate | 2020 |
| Barnes Legal Limited | Professional & scientific | 2019 |
| Barons PUB Company Ltd | Hospitality | 2000 |
| Bartragh Estates Ltd | Real estate | 2025 |
| BAS 21 Limited | Hospitality | 2021 |
| Bassline Pictures Limited | Information & communication | 2025 |
| Bates Build and Design Limited | Construction | 2023 |
| Battersea Windfarms Limited | Information & communication | 2020 |
| Bayside 119 Limited | Health & social care | 2025 |
| BB Services Ltd | Information & communication | 2024 |
| BBA Design & Development LLP | | 2016 |
| BDV Capital Ltd | Professional & scientific | 2020 |
| Beacon Capital Nominees Ltd | Financial services | 2015 |
| Beanstore Limited | Agriculture & fishing | 1998 |
| Beardshaw Restaurants Limited | Hospitality | 2023 |
| Beauclere House Surbiton Managements Limited | Households | 1976 |
| Beavers Bespoke Limited | Households | 2025 |
| Becklow Estates Ltd | Real estate | 2023 |
| Bedrock Services Limited | Information & communication | 2015 |
| Belmont Investment (UK) Limited | Financial services | 2013 |
| Benedict's Property Management Company Limited | Households | 2005 |
| Benfen Ltd | Professional & scientific | 2020 |
| Benkert Holdings 1 Limited | Financial services | 2016 |
| Bentley Roofing & Building Limited | Construction | 2026 |
| Berkshire-Grant Limited | Manufacturing | 1981 |
| Berrymead Consultants Limited | Real estate | 2009 |
| Best Virtues Ltd | Wholesale & retail | 2019 |
| Beta Distribution (South) Ltd | Administrative & support | 2001 |
| Better Lines Limited | Professional & scientific | 1998 |
| Beverley-Perkins Services Limited | Construction | 2013 |
| Bevington Capital Limited | Real estate | 2017 |
| Bevl Design Ltd | Professional & scientific | 2026 |
| BGR Windows Limited | Administrative & support | 2024 |
| BHL Propco Holdings Ltd | Financial services | 2025 |
| BHL Subco Ltd | Real estate | 2025 |
| BHL Topco Ltd | Financial services | 2025 |
| Bickmore Limited | Professional & scientific | 2016 |
| Big Little Stars LLP | | 2022 |
| Big Smoke Brew Co Limited | Manufacturing | 2014 |
| Big Smoke Inns Limited | Hospitality | 2023 |
| Big WIG Investments Limited | Other services | 2012 |
| Bigshow Productions Ltd | Information & communication | 2000 |
| BIM Code Limited | Information & communication | 2023 |
| BIM Digital Solutions Ltd | Professional & scientific | 2023 |
| Bingham Building Contracts Limited | Construction | 2019 |
| Birchfield Ventures Limited | Extraterritorial | 2016 |
| Biri Industries UK Ltd | Wholesale & retail | 2022 |
| Black Graphite Architects Ltd | Financial services | 2025 |
| Black RAT Scenery Limited | Arts & recreation | 2015 |
| Blackhills Residents' Association Limited | Other services | 1979 |
| Blackstone Entertainment Limited | Information & communication | 2024 |
| Blackstone Search Limited | Information & communication | 2021 |
| Blanchett Limited | Real estate | 2020 |
| Blank Canvas Travel Limited | Administrative & support | 2017 |
| Blazingtrails Ltd | Professional & scientific | 2023 |
| Bleep Films Ltd | Information & communication | 2018 |
| Bliss Builds Ltd | Construction | 2023 |
| Bloodandsand Limited | Hospitality | 2005 |
| Bloodstone Projects Limited | Professional & scientific | 2024 |
| Bluehouse Artspace Ltd | Arts & recreation | 2025 |
| BN Carpentry Ltd | Manufacturing | 2022 |
| BOC Contractors Ltd | Construction | 2020 |
| Bocca Limited | Professional & scientific | 2013 |
| Bodlemar Ltd | Information & communication | 2019 |
| Book of Dreams (Publishing) Limited | Information & communication | 1986 |
| Book of Dreams Limited | Arts & recreation | 1984 |
| Book of Dreams Music Ltd | Professional & scientific | 2019 |
| Boontje LLP | | 2024 |