| Barrotji International Limited | Wholesale & retail | 2020 |
| Barrots Ltd | Construction | 2015 |
| Barrow IT Solutions Ltd | Information & communication | 2023 |
| Barry Duffy Ltd | Construction | 2025 |
| Barsan Construction Ltd | Construction | 2020 |
| Bartek Deli Enterprise Limited | Wholesale & retail | 2012 |
| Bartron Limited | Real estate | 1999 |
| Base MIX Limited | Manufacturing | 2002 |
| Based BK Ltd | Professional & scientific | 2017 |
| Basic Beauty Limited | Other services | 2017 |
| Basic Shirts UK Limited | Wholesale & retail | 2019 |
| Basoo International Import & Export Company Limited | Wholesale & retail | 2023 |
| BASRA4 Limited | Professional & scientific | 2023 |
| Bass Camp LDN Ltd | Arts & recreation | 2024 |
| Bathroom & Plumbing Essentials Ltd | Wholesale & retail | 2017 |
| Bats Cabs Ltd | Administrative & support | 2018 |
| Bau's Hub Limited | Hospitality | 2026 |
| Bavansa Limited | Real estate | 2025 |
| Bawan Auto Ltd | Manufacturing | 2020 |
| Bawtrey Limited | Other services | 2021 |
| Bayswater Management Ltd | Hospitality | 2016 |
| Baytex Limited | Administrative & support | 2013 |
| BAZ Estate Limited | Real estate | 2012 |
| Bazzar Ltd | Wholesale & retail | 2024 |
| BB Beauty Private Ltd | Other services | 2025 |
| BB Chicken UK Franchise Ltd | Professional & scientific | 2026 |
| BB Chicken UK Holding Ltd | Financial services | 2026 |
| BB Chicken UK Ltd | Hospitality | 2026 |
| BB Property Solutions Ltd | Construction | 2021 |
| BB UK Property Ltd | Real estate | 2024 |
| BB3 Electrical Contractors Limited | Construction | 2023 |
| BBC Light Investment Ltd | Construction | 2024 |
| BBC Lighting & Electrical Services Ltd | Construction | 2018 |
| BBM Nurseries Ltd | Health & social care | 2021 |
| BBQ Chinese Restaurant Limited | Hospitality | 2020 |
| Bbqonthegreenuk CIC | Health & social care | 2025 |
| Bbrothers Construct Ltd | Construction | 2019 |
| BBY Flowers Ltd | Construction | 2021 |
| BCC Distribution Ltd | Wholesale & retail | 2024 |
| BCD Fish & Chips Ltd | Hospitality | 2024 |
| BCP Group Ltd | Hospitality | 2010 |
| Bcvd Limited | Construction | 2023 |
| BDA Property Portfolio Limited | Real estate | 2026 |
| Bdbf Ltd | Hospitality | 2019 |
| BDG Star Builders Ltd | Construction | 2021 |
| BDI Electrical Solutions Limited | Construction | 2020 |
| BDLONDON24.COM Limited | Wholesale & retail | 2019 |
| BDM Infinity Ltd | Wholesale & retail | 2025 |
| BDP Spirit Limited | Administrative & support | 2018 |
| BDV Construction Limited | Construction | 2022 |
| BE Kids Ltd | Wholesale & retail | 2021 |
| BE MED Ltd | Health & social care | 2018 |
| BE Varsity Limited | Other services | 2018 |
| Beaconx Ltd | Construction | 2023 |
| Beajade Designs Ltd | Professional & scientific | 2016 |
| Beans & Brews Ltd | Hospitality | 2026 |
| Beanstalk Events Limited | Administrative & support | 2018 |
| Bear With ME Coffee Shop Limited | Hospitality | 2026 |
| Beary Local Ltd | Information & communication | 2025 |
| Beautiful Smiles by SA Ltd | Health & social care | 2022 |
| Beautiwala Ltd | Wholesale & retail | 2026 |
| Beautology by Jessica Ltd | Other services | 2015 |
| Beauty & Natural Desire Supplements Ltd | Manufacturing | 2024 |
| Beauty Avenue Ltd | Professional & scientific | 2022 |
| Beauty Box by a Ltd | Other services | 2014 |
| Beauty by Joyce Ltd | Other services | 2023 |
| Beauty by Sonal Limited | Other services | 2019 |
| Beauty Care Global Limited | Wholesale & retail | 2022 |
| Beauty Complex Europe Ltd | Wholesale & retail | 2018 |
| Beauty Fragrance Station Ltd | Wholesale & retail | 2024 |
| Beauty Magasin Ltd | Wholesale & retail | 2013 |
| Beauty Squared (Wembley Park) Limited | Other services | 2024 |
| Beauty Star Limited | Wholesale & retail | 1995 |
| Beauty Vibes Beauty Treatment Ltd | Other services | 2025 |
| Beauty With Environmental Purposes Limited | Manufacturing | 2021 |
| Beautypom Limited | Wholesale & retail | 2018 |
| Beavers Green Limited | Administrative & support | 2014 |
| BEC Foods Ltd | Wholesale & retail | 2017 |
| BEC Services (UK) Ltd | Administrative & support | 2010 |
| Becharm Ltd | Wholesale & retail | 2021 |
| Becker Hoffman Facilities Management Ltd | Hospitality | 2023 |
| Bedford & Lindley Capital Ltd | Real estate | 2023 |
| Bedford Shipping Limited | Transport & logistics | 2025 |
| Bedi Legal Services Ltd | Professional & scientific | 2024 |
| Bedi Ltd | Wholesale & retail | 2025 |
| Beds Outlet London Limited | Wholesale & retail | 2025 |
| BEE Online Cloud Limited | Information & communication | 2016 |
| BEE Viper R & D Limited | Professional & scientific | 2012 |
| Beecsan Marketplace Ltd | Information & communication | 2026 |
| Beeline Auto Ltd | Wholesale & retail | 2026 |
| Beeline Homes Ltd | Real estate | 2025 |
| Beem Bookings Ltd | Arts & recreation | 2025 |
| Beenoskee Ltd | Hospitality | 2023 |
| Beesosmart Limited | Extraterritorial | 2021 |
| Beirut Express Food Ltd | Hospitality | 2019 |
| Beit Al-Dawah Ltd | Health & social care | 2022 |
| Bekiz Ltd. | Hospitality | 2025 |
| Bektel Holding Ltd | Construction | 2020 |
| Belarao Capital Ltd | Real estate | 2020 |
| Belavadi Technologies Limited | Information & communication | 2018 |