| Baileydoesseo Ltd | Information & communication | 2025 |
| Baillie Street Brewhouse Limited | Professional & scientific | 2021 |
| Bainsdown Limited | Real estate | 1982 |
| Bainton Medical Limited | Health & social care | 2026 |
| Baird Media Limited | Information & communication | 2009 |
| Baird Street Developments Limited | Extraterritorial | 2013 |
| Bais Boruch Ltd | Real estate | 2019 |
| Bais Malka Ltd | Other services | 2007 |
| Bais Tefilla | Other services | 2018 |
| Baisakhi DIL Ltd | Hospitality | 2022 |
| Baisan Ltd | Real estate | 2026 |
| Baisemark Limited | Wholesale & retail | 1982 |
| Baiss Ltd | Other services | 2017 |
| Baitul Properties Ltd | Real estate | 2024 |
| Baity Ardwick Ltd | Hospitality | 2022 |
| Baity Catering and Leisure Ltd | Hospitality | 2016 |
| Baiwood Property Limited | Real estate | 2026 |
| Bajiahx Ltd | Wholesale & retail | 2025 |
| Bajouri Trading Ltd | Education | 2020 |
| Baju Zentro Trade Ltd | Real estate | 2026 |
| Bajwa Consultants Ltd | Wholesale & retail | 2022 |
| Bajwaaa Ltd | Wholesale & retail | 2025 |
| Bakan Gizo UK Ltd | Wholesale & retail | 2024 |
| Bakbak for Trading Ltd | Wholesale & retail | 2025 |
| Baked Events Ltd | Hospitality | 2021 |
| Baked Holdings Ltd | Real estate | 2025 |
| BAKEHOUSE32 Ltd | Hospitality | 2025 |
| Baker Financial Planning Ltd | Financial services | 2006 |
| Baker Mallett LLP | | 2003 |
| Baker MAY Limited | Administrative & support | 2015 |
| Baker Street Legal Limited | Professional & scientific | 2024 |
| Bakers Heaven Ltd | Manufacturing | 2020 |
| Bakers Quality Ltd | Wholesale & retail | 2025 |
| Bakery Bagietka Ltd | Manufacturing | 2010 |
| Bakery Bar & Transport Ltd | Transport & logistics | 2020 |
| Bakesbych Ltd | Wholesale & retail | 2025 |
| Bakewell Healthcare Ltd | Wholesale & retail | 2024 |
| Bakewell Organics | Wholesale & retail | 2024 |
| Bakhat Traders Ltd | Wholesale & retail | 2022 |
| Bakht Elrida Arabic School MR Limited | Education | 2025 |
| Bakr Traders Ltd | Wholesale & retail | 2024 |
| Bakrania Limited | Construction | 2026 |
| Bakri Global Logistics Ltd | Transport & logistics | 2026 |
| Baku Traders Ltd | Wholesale & retail | 2024 |
| Bakvision Medicals Ltd | Health & social care | 2025 |
| BAL Care Ltd | Other services | 2023 |
| BAL Care Services Ltd | Health & social care | 2015 |
| BAL25 Limited | Administrative & support | 2005 |
| Bala Foods Ltd | Hospitality | 2024 |
| Bala Luxury Estates Limited | Real estate | 2026 |
| Balago Limited | Other services | 2020 |
| Balaj Traders Limited | Wholesale & retail | 2026 |
| Balan Properties Limited | Real estate | 2001 |
| Balance Brewing & Blending Ltd | Manufacturing | 2021 |
| Balance Marketing Group Limited | Extraterritorial | 2022 |
| Balance of Nature (U.K) Ltd | Manufacturing | 2021 |
| Balance Wellness Ltd | Health & social care | 2015 |
| Balance With Becky Limited | Other services | 2025 |
| Balance World Ltd | Administrative & support | 2024 |
| Balance Your Nutrition Limited | Wholesale & retail | 2019 |
| Balancebridge Consulting Ltd | Wholesale & retail | 2025 |
| Balanced Digital Ltd | Professional & scientific | 2023 |
| Balancesentiments Ltd | Extraterritorial | 2024 |
| Balanzat Ltd | Information & communication | 2020 |
| Balanzo Trading Ltd | Wholesale & retail | 2025 |
| Balat Ltd | Wholesale & retail | 2025 |
| Balatrax Ltd | Wholesale & retail | 2017 |
| Balcap Limited | Wholesale & retail | 2025 |
| Balcarres Wigan Ltd | Real estate | 2022 |
| Balcombes Limited | Professional & scientific | 1986 |
| Balcony Festival Ltd | Wholesale & retail | 2025 |
| Bald Tyres Ltd | Information & communication | 2016 |
| Balderstone Associates Ltd | Information & communication | 2021 |
| Balderstone Limited | Real estate | 1988 |
| Baldo Strategy Limited | Professional & scientific | 2024 |
| Baldread Limited | Financial services | 2025 |
| Baldwin (D&P) Limited | Real estate | 2018 |
| Baldwin (Moreton) LLP | | 2007 |
| Baldwin Property Management Limited | Administrative & support | 2015 |
| Baldwins Gate (Royton) Management Company Limited | Households | 2005 |
| Baleha for Trading Ltd | Wholesale & retail | 2026 |
| Balfour Bell Leisure Limited | Extraterritorial | 2012 |
| Balholm Court Management Company Limited | Households | 1973 |
| Bali Mayna Limited | Real estate | 2010 |
| Bali Sukainah Ltd | Wholesale & retail | 2024 |
| Bali& Co Limited | Wholesale & retail | 2025 |
| Balin Design and Build Developments Limited | Construction | 2015 |
| Baljit Housing Ltd | Real estate | 2026 |
| Balkan 2020 Limited | Hospitality | 2025 |
| Ball & Young Limited | Manufacturing | 1967 |
| Ball Homes Limited | Real estate | 2022 |
| Ball Together NOW CIC | Arts & recreation | 2024 |
| Ballagh Consulting Ltd | Information & communication | 2006 |
| Ballardie Smith Limited | Professional & scientific | 2015 |
| Ballaro Nova Limited | Hospitality | 2015 |
| Ballers London Ltd | Wholesale & retail | 2019 |
| Ballers Padel Limited | Arts & recreation | 2025 |
| Ballester Jardin Disain Limited | Other services | 2019 |
| Ballet Trade Ltd | Wholesale & retail | 2025 |
| Ballin for the Culture Limited | Wholesale & retail | 2025 |