| BEE Gift Ltd | Manufacturing | 2022 |
| Beedz Property Limited | Real estate | 2019 |
| Beer Britannia Limited | Wholesale & retail | 2025 |
| Beeroots Limited | Wholesale & retail | 2018 |
| Beesem Consultancy Ltd | Professional & scientific | 2023 |
| BEH Accountancy Ltd | Professional & scientific | 2011 |
| Belcamp Limited | Real estate | 1974 |
| Belehanmn Services Limited | Information & communication | 2013 |
| Believers Faith Hostels CIC Community Interest Company | Hospitality | 2024 |
| Bella & Vita Limited | Hospitality | 2022 |
| Bella & Vita T/A Ltd | Hospitality | 2024 |
| Bellababy Ltd | Wholesale & retail | 2016 |
| Belmen Property Management Limited | Households | 2025 |
| Belmont Road (Twickenham) Management Limited | Households | 2001 |
| Belvpure Ltd | Administrative & support | 2024 |
| BEN Millington Creative Ltd | Professional & scientific | 2016 |
| Ben's Mushrooms Ltd | Agriculture & fishing | 2026 |
| Bendervision Limited | Information & communication | 2013 |
| Bener Advisory Services Limited | Other services | 2017 |
| Benevolai Limited | Education | 2025 |
| Bengal Village London Limited | Hospitality | 2014 |
| Beny Homes Ltd | Real estate | 2021 |
| Beny Motors Ltd | Wholesale & retail | 2020 |
| Berba Group UK Limited | Wholesale & retail | 2021 |
| Berg Property Group Ltd | Construction | 2017 |
| Bergraf Developments Limited | Real estate | 2025 |
| Bergraf Ltd | Real estate | 2021 |
| Beringer Blass Wine Estates Limited | Extraterritorial | 1993 |
| Berkley Close Residents Association Limited | Households | 1984 |
| Bespoke Photography London Limited | Professional & scientific | 2010 |
| Bespoke Software Limited | Information & communication | 2007 |
| Bespoke Wardrobes Ltd | Wholesale & retail | 2022 |
| Beuxbernard Ltd | Other services | 2017 |
| Bexhill Developments Limited | Real estate | 2016 |
| Beyond the Label Ltd | Information & communication | 2026 |
| BF & a Ltd | Professional & scientific | 2026 |
| BFGAVIN88 Limited | Other services | 2019 |
| Bhandal Commercials Limited | Real estate | 2022 |
| Bhandal Investors Limited | Real estate | 2021 |
| Bharaj Enterprises Limited | Real estate | 2013 |
| Bibbybwang Archive Research Services Limited | Information & communication | 2011 |
| Bibi Lucille Ltd | Arts & recreation | 2025 |
| BID Shopping Ltd | Wholesale & retail | 2015 |
| Big ME Productions Ltd | Information & communication | 2020 |
| Biking for Children in Care Ltd | Arts & recreation | 2024 |
| BILETY24 UK Ltd | Administrative & support | 2016 |
| Billacombe Property Ltd | Real estate | 2024 |
| Billy Allen Autos Limited | Wholesale & retail | 2003 |
| Billyshots Ltd | Manufacturing | 2025 |
| Biome RX Pharma Limited | Professional & scientific | 2023 |
| Biover Partners LLP | | 2022 |
| BIT Easy Ltd. | Information & communication | 2018 |
| Bitform Ltd | Information & communication | 2017 |
| Bitgin Ltd | Information & communication | 2011 |
| Bitsnbytes-Uk Ltd | Wholesale & retail | 2025 |
| Bjjfamily Ltd | Education | 2026 |
| BK Property Assets Ltd | Real estate | 2026 |
| Black Cat Partners LLP | | 2015 |
| Black EYE Solutions Ltd | Information & communication | 2014 |
| Black Rock Property Investor Ltd | Real estate | 2022 |
| Black Sea Consulting Ltd | Professional & scientific | 2026 |
| Black Snapper Limited | Professional & scientific | 2024 |
| Blackwater Advisory Ltd | Professional & scientific | 2025 |
| Blank Cheque Limited | Professional & scientific | 2020 |
| Blended Past Ltd | Professional & scientific | 2024 |
| Bless Baby Birth & Beyond Ltd | Health & social care | 2024 |
| Blink Game Studio Ltd | Information & communication | 2024 |
| Block Alpha Ltd | Information & communication | 2018 |
| Block SQ FT Ltd | Information & communication | 2021 |
| Blockgain Labs Ltd | Information & communication | 2022 |
| Blonde Ambitions - Broadcast and Event Management Ltd | Information & communication | 2020 |
| Blue Bear Pubs Ltd | Hospitality | 2025 |
| Blue Cayenne Ltd | Information & communication | 2016 |
| Blue Edge Capital Partners LLP | | 2013 |
| Blue EYE Events Ltd | Arts & recreation | 2024 |
| Blue Ladder Education Limited | Education | 2025 |
| Blue Pond Consultants Ltd | Professional & scientific | 2024 |
| Blue Sky Twickenham Limited | Construction | 2020 |
| Blue SMD Limited | Hospitality | 2026 |
| Blue Tagger Ltd | Professional & scientific | 2010 |
| Blue Trove Ltd | Professional & scientific | 2024 |
| Bluebird Carriers Limited | Transport & logistics | 2001 |
| Bluepen Trading Limited | Wholesale & retail | 2025 |
| Blunt Pictures Ltd | Information & communication | 2010 |
| BME Development Limited | Real estate | 2025 |
| BMH Tutoring Ltd | Professional & scientific | 2006 |
| BND Consultancy Emea Limited | Professional & scientific | 2025 |
| BO Connect Limited | Administrative & support | 2015 |
| Boardroom Impact Score Ltd | Administrative & support | 2019 |
| Boaty Bits Ltd | Manufacturing | 2021 |
| Bobbie's Swim Ltd | Wholesale & retail | 2023 |
| Body Logic Twickenham Limited | Health & social care | 2007 |
| Body MAP Ltd | Information & communication | 2025 |
| Bohemian Films Ltd | Information & communication | 2016 |
| Bombay Artisan UK Ltd | Hospitality | 2018 |
| Bombos Technology Limited | Information & communication | 2024 |
| Bond Private Concierge Limited | Other services | 2014 |
| Bones Espresso Ltd | Hospitality | 2021 |
| Bonita O'Brien Ltd | Professional & scientific | 2020 |
| Bonjour Communications Limited | Manufacturing | 2023 |