| AYY Care Limited | Health & social care | 2024 |
| AYY Ltd | Transport & logistics | 2024 |
| Ay’S Kitchen Limited | Hospitality | 2025 |
| AZ Auto Body Car Limited | Wholesale & retail | 2025 |
| AZ Auto Car Sales Ltd | Wholesale & retail | 2026 |
| AZ Consult Ltd | Professional & scientific | 2022 |
| AZ MOT Centre (Rotherham) Ltd | Wholesale & retail | 2026 |
| Azaamia Ltd | Administrative & support | 2025 |
| Azaan Builders Ltd. | Construction | 2018 |
| Azad Estate Ltd | Real estate | 2026 |
| Azal Properties Ltd | Real estate | 2023 |
| Azalea Medical Services Ltd | Health & social care | 2024 |
| Azamah Ltd | Real estate | 2024 |
| Azar Investment Limited | Hospitality | 2024 |
| Azarris Limited | Real estate | 2025 |
| AZB Adviser Services Limited | Financial services | 2013 |
| AZE Limited | Hospitality | 2019 |
| Azhar Travels Ltd | Transport & logistics | 2025 |
| Azimuth Programming Limited | Health & social care | 2010 |
| Azimuth Properties Limited | Real estate | 2023 |
| Aziza Holdings Limited | Financial services | 2023 |
| Azlaan School of Motoring Ltd | Education | 2024 |
| Azmar Property Limited | Wholesale & retail | 2016 |
| Azmy Sanders Ltd | Health & social care | 2019 |
| Aztech Studios Ltd | Information & communication | 2026 |
| AZU Consultancy Ltd | Professional & scientific | 2021 |
| AZU Enterprises Ltd | Wholesale & retail | 2025 |
| AZU Services Ltd | Hospitality | 2022 |
| Azukile Healthcare Services Ltd | Health & social care | 2019 |
| Azul UK Consulting Limited | Professional & scientific | 2021 |
| Azur Films Ltd | Information & communication | 2015 |
| Azur Locations Ltd | Real estate | 2006 |
| Azuri Lounge Limited | Hospitality | 2023 |
| Azurite Research Ltd | Professional & scientific | 2018 |
| Azuro Management Limited | Professional & scientific | 2014 |
| AZW Consulting Ltd | Financial services | 2010 |
| B & F C Services Ltd | Health & social care | 2006 |
| B & I Commercial Properties Limited | Real estate | 2013 |
| B & M Properties (Yorkshire) Ltd | Construction | 2025 |
| B & N Demolition Services Limited | Construction | 2018 |
| B & P Care Services Ltd | Health & social care | 2017 |
| B & P Holdings (Yorkshire) Ltd | Financial services | 2024 |
| B & P Wholesale Limited | Wholesale & retail | 2005 |
| B & S General Builderss Ltd | Construction | 2023 |
| B & T Lettings Ltd | Real estate | 2026 |
| B & Z Traders Ltd | Wholesale & retail | 2017 |
| B - Dazzled Bathrooms Ltd | Wholesale & retail | 2022 |
| B a M V Limited | Transport & logistics | 2013 |
| B a W Properties Limited | Real estate | 2003 |
| B and T Specialist Care Limited | Health & social care | 2023 |
| B B R Autos Ltd | Wholesale & retail | 2016 |
| B Braun Healthcare Limited | Extraterritorial | 1989 |
| B Braun Sterilog (Birmingham) Limited | Health & social care | 2000 |
| B Braun Sterilog (Yorkshire) Limited | Health & social care | 1892 |
| B Braun Sterilog Limited | Health & social care | 1980 |
| B Brothers Autos Limited | Wholesale & retail | 2025 |
| B C Scaffold LLP | | 2013 |
| B D Italian Limited | Professional & scientific | 2007 |
| B Forum Limited | Information & communication | 2020 |
| B G Railway Services Ltd | Construction | 2014 |
| B Hall Construction Ltd | Construction | 2021 |
| B Home Limited | Real estate | 2017 |
| B Innovative Ltd. | Information & communication | 2010 |
| B L Electrical Contractors Limited | Construction | 1996 |
| B LEE Fencing Limited | Construction | 2024 |
| B Louise Services Ltd | Information & communication | 2021 |
| B M Plumbing Services Ltd | Construction | 2014 |
| B M Rope Access Ltd | Construction | 2012 |
| B M Sinha Ltd | Health & social care | 2015 |
| B M Trzaska Ltd | Information & communication | 2017 |
| B on 1 Ltd | Wholesale & retail | 2014 |
| B P Dempsey (Heating) Ltd | Construction | 2026 |
| B Parr Properties Limited | Real estate | 2026 |
| B R G Recycling Machinery Limited | Manufacturing | 2007 |
| B Rose Developments Ltd | Construction | 2023 |
| B S C Freight Limited | Transport & logistics | 1964 |
| B S Duncan Limited | Professional & scientific | 2011 |
| B S I J Limited | Wholesale & retail | 2021 |
| B&A Longden Services Ltd | Wholesale & retail | 2023 |
| B&B Silkhouse Limited | Wholesale & retail | 2023 |
| B&B UK Enterprise Ltd | Wholesale & retail | 2025 |
| B&E Cosmetics Organic Ltd | Manufacturing | 2026 |
| B&H National Suppliers Ltd | Wholesale & retail | 2025 |
| B&M Consultancy Ltd | Professional & scientific | 2024 |
| B&O Auto Repair Center Ltd | Wholesale & retail | 2025 |
| B&R Cladded Roof Ltd | Construction | 2023 |
| B&S Massage Limited | Other services | 2026 |
| B&U Distribution UK Ltd | Wholesale & retail | 2024 |
| B&Y Properties Limited | Real estate | 2022 |
| B'Reyt Dough Ltd | Hospitality | 2023 |
| B-Ali Empowered CIC | Arts & recreation | 2025 |
| B-Dazzled Fitting Services Limited | Construction | 2023 |
| B-Globalsolutions Ltd | Administrative & support | 2025 |
| B-Line Hospitality Limited | Hospitality | 2022 |
| B-Spatial Limited | Information & communication | 2020 |
| B. & J. Farms Limited | Agriculture & fishing | 1983 |
| B. Braun Avitum UK Limited | Health & social care | 2001 |
| B. H. Scrap Metals Ltd | Water & waste | 2009 |
| B. Watkins Electrical Ltd | Construction | 2020 |
| B.A.C.A. International UK Limited | Other services | 2016 |