| Assure Wealth Management Ltd | Financial services | 2014 |
| Assured Financial Resources Ltd | Financial services | 2006 |
| Aston Campbell Associates Limited | Professional & scientific | 2007 |
| Athyna & Aepolo Ltd | Wholesale & retail | 2023 |
| Atlantic Consulting Services Ltd | Administrative & support | 2018 |
| Attek Services Ltd | Transport & logistics | 2018 |
| Audio UK 2 Limited | Financial services | 2017 |
| Audio UK 3 Limited | Financial services | 2017 |
| Audio Visual Material Limited | Wholesale & retail | 2019 |
| Audiotonix Group Limited | Financial services | 2017 |
| Audiotonix Holdings Limited | Financial services | 2019 |
| Audiotonix Limited | Financial services | 2024 |
| Authentic Tuga Deli Limited | Wholesale & retail | 2026 |
| Autumn Tree Joinery Ltd | Construction | 2017 |
| AV SAT Ltd | Information & communication | 2012 |
| AV1 West London Tech Support Ltd | Information & communication | 2025 |
| Avantgarde Building & Carpentry Ltd | Construction | 2016 |
| Avorpik Ltd | Wholesale & retail | 2024 |
| Avsouth Limited | Households | 1997 |
| Awesome Partners Ltd | Wholesale & retail | 2016 |
| Ayla 2021 Limited | Hospitality | 2024 |
| Aztec Event Holdings Limited | Administrative & support | 2017 |
| Aztec Event Services Limited | Administrative & support | 2005 |
| Aztec Event Technology Limited | Administrative & support | 2012 |
| B D Medic Assist Ltd | Professional & scientific | 2013 |
| B R Property Investment Ltd | Real estate | 2017 |
| B&I Restaurant Ltd | Hospitality | 2020 |
| B-Tak Investments Limited | Manufacturing | 2010 |
| B.J.C. Woodall Limited | Agriculture & fishing | 1964 |
| BAD Viking Ltd | Information & communication | 2011 |
| Baguni Limited | Wholesale & retail | 2006 |
| BAM Active Sports Ltd | Manufacturing | 2018 |
| Banaj - Chelsea Ltd | Other services | 2014 |
| Banana and Pineapple Ltd | Wholesale & retail | 2020 |
| Bandland Records Ltd | Arts & recreation | 2008 |
| Bannerman Arts Ltd | Arts & recreation | 2023 |
| Baoas Ltd | Wholesale & retail | 2025 |
| Baran & Berkay Ltd | Construction | 2019 |
| Barisons Theatre Productions Ltd | Information & communication | 2015 |
| Barwell Court Farm Management Company Limited | Households | 1998 |
| Base Boxing CIC | Education | 2025 |
| Battine House Management Company Limited | Households | 2007 |
| Baytek Limited | Construction | 2011 |
| Bazeera Ltd | Wholesale & retail | 2025 |
| BDK Services Ltd | Construction | 2019 |
| BE Dazzled Cleaners (Surrey) Limited | Administrative & support | 2014 |
| BE Heard Media Ltd | Professional & scientific | 2013 |
| Bedford Insurance Services Group Limited | Financial services | 2005 |
| Bedrock Enterprises Ltd | Financial services | 2017 |
| Beesmax Limited | Professional & scientific | 2018 |
| Beigebell International Limited | Extraterritorial | 2020 |
| Beigebell Limited | Wholesale & retail | 2010 |
| Bella & BOB Ltd | Wholesale & retail | 2023 |
| Ben's Garden Services Ltd | Agriculture & fishing | 2012 |
| Berling Property Ltd | Hospitality | 2021 |
| Bernard J. Arnull & Co. Limited | Wholesale & retail | 1978 |
| Berry Hill Farm Limited | Administrative & support | 2018 |
| Beste and Batu Ltd | Real estate | 2023 |
| Bestweld Limited | Construction | 2006 |
| Bethel International Revival Church Ltd | Other services | 2008 |
| Betty MAY Ltd | Wholesale & retail | 2023 |
| BF Computing Ltd | Information & communication | 2013 |
| Bgfurniture Ltd | Manufacturing | 2019 |
| BGM Retail Media Limited | Wholesale & retail | 2026 |
| Bible and Gospel Trust | Manufacturing | 2005 |
| Bidzilla Limited | Financial services | 2016 |
| Big Boys Burgers Ltd | Hospitality | 2025 |
| Big Thinking Consultancy Limited | Information & communication | 2013 |
| Bigplus Design & Consultancy Ltd | Construction | 2020 |
| Bioalgebra Limited | Information & communication | 2026 |
| Biolixir Ltd | Wholesale & retail | 2023 |
| Bizborough Ltd | Wholesale & retail | 2008 |
| Bizlist Limited | Information & communication | 2025 |
| BL Health Care Limited | Administrative & support | 2017 |
| Black and Amber Limited | Professional & scientific | 2009 |
| Blackfast Chemicals Limited | Wholesale & retail | 2005 |
| Blackhills Developments Limited | Extraterritorial | 2013 |
| Blackriver Investments Limited | Real estate | 2024 |
| Blantyre Homes Ltd | Real estate | 2023 |
| Blend N Bake Ltd | Wholesale & retail | 2021 |
| Bloom the Label Ltd | Wholesale & retail | 2018 |
| Blu.Bean Creative Limited | Professional & scientific | 2012 |
| Blue Day Ventures Ltd | Financial services | 2025 |
| Blue Phoenix Geological Consulting Limited | Professional & scientific | 2012 |
| Bluelane Limited | Real estate | 1998 |
| BMJ Electrical Services Limited | Construction | 2020 |
| Bodibuddi Ltd | Extraterritorial | 2022 |
| Bollé Brands (UK) Limited | Wholesale & retail | 1991 |
| Bolt Marketing Ltd | Administrative & support | 2025 |
| Bonchurch Bungalows (Ventnor) Limited | Real estate | 1999 |
| Borium Studio Limited | Information & communication | 2016 |
| Boult Contracting Limited | Administrative & support | 2019 |
| Box Clever Events Limited | Hospitality | 2021 |
| BP Casa London Ltd | Wholesale & retail | 2023 |
| BPR International Limited | Wholesale & retail | 2024 |
| BPS Maintenance Ltd | Other services | 2026 |
| Bramptons & SON Ltd | Professional & scientific | 2021 |
| Bramptons Estates Ltd | Real estate | 2021 |
| Brasp Ltd | Wholesale & retail | 2021 |
| Bravolife Ltd | Hospitality | 2019 |