| AZ Value Services Ltd | Hospitality | 2025 |
| Azai Property Limited | Construction | 2025 |
| Azam & Sons Property Investments Limited | Real estate | 2020 |
| Azam Group Ltd | Wholesale & retail | 2021 |
| Azco Interiors Limited | Construction | 2009 |
| AZH Consulting Ltd | Professional & scientific | 2020 |
| Azhar Lamya Ltd | Wholesale & retail | 2024 |
| Aziz Holdings 53 Ltd | Real estate | 2021 |
| Azmo's Grill Ltd | Hospitality | 2025 |
| Azure Enterprises Limited | Real estate | 2013 |
| B & B Singh Construction Ltd | Construction | 2018 |
| B & K Electrical Contractors Limited | Construction | 2007 |
| B & R West London Ltd | Real estate | 2025 |
| B 2 Business Systems Limited | Extraterritorial | 2003 |
| B Bespoke Developments Ltd | Construction | 2021 |
| B J House Limited | Wholesale & retail | 2020 |
| B Miles Rigging Ltd | Information & communication | 2024 |
| B Owens Contractors Ltd | Construction | 2021 |
| B P Autoparts & Repairs Limited | Wholesale & retail | 2009 |
| B Real Productions Ltd | Information & communication | 2008 |
| B Singh Plumbing & Heating Ltd | Construction | 2019 |
| B&J Woods Ltd | Real estate | 2023 |
| B&R Autoworks Ltd | Wholesale & retail | 2026 |
| B&W Creations Limited | Construction | 2015 |
| B.A. Williams (Properties) Holdings Limited | Financial services | 2020 |
| B.A. Williams (Properties) Limited | Construction | 2019 |
| B.G.M.P. Limited | Information & communication | 1997 |
| B.R. Films Limited | Information & communication | 2008 |
| B2K Services Limited | Construction | 2022 |
| B4TIME Ltd | Construction | 2020 |
| B5 Plus Investments Limited | Real estate | 2013 |
| Baani's Electrical World Ltd | Construction | 2024 |
| Baani’S Electrical Store Ltd | Wholesale & retail | 2024 |
| Baarr Ltd | Other services | 2011 |
| Baba's Original Ltd | Information & communication | 2023 |
| Bablex Limited | Professional & scientific | 2017 |
| Bacha & Sons Ltd | Construction | 2024 |
| Back Bay Ltd | Wholesale & retail | 2025 |
| Back of the Flats Ltd | Construction | 2015 |
| Backtick Ltd | Wholesale & retail | 2024 |
| Badger Gardens Management Limited | Households | 2008 |
| Baet Ltd | Education | 2022 |
| Bafin Holdings | Professional & scientific | 1982 |
| Baghla Limited | Health & social care | 2010 |
| Baghla Property Services Limited | Real estate | 2018 |
| Baglan Joinery Ltd | Manufacturing | 2017 |
| Bagshot Property Developments Limited | Construction | 2024 |
| Baguette and More Ltd | Hospitality | 2023 |
| Bagz N Boxez Ltd | Wholesale & retail | 2022 |
| Bains Immigration Ltd | Professional & scientific | 2024 |
| Bajaj and Sons Limited | Real estate | 2012 |
| Bajaj Sons Limited | Real estate | 2026 |
| Bajwa Construction & Design Ltd | Construction | 2022 |
| Baked by J Limited | Wholesale & retail | 2024 |
| Bakers Electrical and Lighting Limited | Manufacturing | 2019 |
| Balaji Alliance Ltd | Wholesale & retail | 2025 |
| Balcony Shirts Limited | Wholesale & retail | 2008 |
| Bald Mechanic Ltd | Wholesale & retail | 2025 |
| Balfour Construction Skills Ltd | Education | 2018 |
| Ballinger Court Flats (Freehold) Limited | Households | 2013 |
| Ballinger Court Flats Limited | Households | 1983 |
| Balmoral Court (Firstgate) RTM Company Limited | Households | 2023 |
| Balouch Trading Ltd | Wholesale & retail | 2024 |
| Balsam Boutique Ltd | Wholesale & retail | 2023 |
| Baltangi Limited | Information & communication | 2012 |
| Balvinder Wilkhu Limited | Professional & scientific | 2022 |
| BAM Drylining Ltd | Construction | 2018 |
| Bandarlog.Dev Ltd | Information & communication | 2021 |
| Banh Banh Limited | Hospitality | 2014 |
| Bani Food & Wine Ltd | Wholesale & retail | 2023 |
| Bann Engineering Services Ltd | Professional & scientific | 2014 |
| Banyan Financial Solutions Ltd | Financial services | 2025 |
| Banyan Solutions Limited | Information & communication | 2003 |
| BAP Utilities Ltd | Construction | 2025 |
| Bapicho Limited | Information & communication | 2013 |
| Barber Zone I Ltd | Other services | 2025 |
| Barchester Holdings Limited | Real estate | 2017 |
| Bardolia Limited | Information & communication | 2021 |
| Bardosi Ltd | Transport & logistics | 2025 |
| Bargain Market Ltd | Wholesale & retail | 2022 |
| Baricca Limited | Extraterritorial | 2020 |
| Barkus House Limited | Real estate | 1992 |
| Barleycare Limited | Health & social care | 2004 |
| Barnham Property Ltd | Real estate | 2025 |
| Barns and Farms Connerton Limited | Construction | 2026 |
| Barns and Farms Limited | Financial services | 2025 |
| Barns and Farms Planning Limited | Real estate | 2026 |
| Barrs' Entry Control Limited | Wholesale & retail | 2006 |
| Bart Construction Management Ltd | Construction | 2014 |
| Base Supplies Limited | Extraterritorial | 2021 |
| Basegold Investments Limited | Real estate | 2006 |
| Basegold Properties Ltd | Real estate | 2017 |
| Bash N Bang Limited | Administrative & support | 2023 |
| Basmim Trading Ltd | Wholesale & retail | 2019 |
| Bassoverdosestockist Ltd | Wholesale & retail | 2021 |
| Basti Capital Ltd | Real estate | 2018 |
| BAT Financial Solutions Ltd | Financial services | 2025 |
| Bathroom Global Ltd | Wholesale & retail | 2024 |
| Batt Consultancy Ltd | Administrative & support | 2025 |
| Baucem Ltd | Construction | 2022 |