| BAZ (UK) Limited | Wholesale & retail | 2014 |
| BAZ Event Security Ltd | Wholesale & retail | 2026 |
| BAZ Logistics Ltd | Transport & logistics | 2025 |
| BB PAK Group Ltd | Real estate | 2021 |
| BB Tech Ltd | Administrative & support | 2012 |
| BBA UK Properties Ltd | Real estate | 2024 |
| Bbab Accountants Limited | Professional & scientific | 2013 |
| Bbbd Construction Ltd | Construction | 2019 |
| BBC Construction Ltd | Construction | 2025 |
| BBF Cash and Carry Limited | Wholesale & retail | 2024 |
| BBG Construct Ltd | Construction | 2017 |
| BBL Manpower Ltd | Other services | 2012 |
| BBL Property Ltd | Real estate | 2011 |
| BBL Technical Recruitment Ltd | Other services | 2014 |
| BBN Infotech UK Ltd | Construction | 2019 |
| BBQ Online Limited | Hospitality | 2025 |
| BBTS2025 Limited | Wholesale & retail | 2025 |
| BC Business Group Limited | Administrative & support | 2022 |
| BC Property Maintenance Limited | Construction | 2024 |
| BC Real Estate Management Ltd | Real estate | 2016 |
| BCE Construction Ltd | Construction | 2014 |
| BCF Ltd | Real estate | 2019 |
| BCN Developments Limited | Construction | 2018 |
| Bcomfort Limited | Construction | 2013 |
| Bcomfort Suporting Administration Limited | Transport & logistics | 2024 |
| BCS Chahal Ltd | Construction | 2017 |
| Bcsi Consulting Ltd | Information & communication | 2011 |
| BD ALL Services Ltd | Real estate | 2025 |
| BD Electrics Ltd | Wholesale & retail | 2021 |
| BD Power Seller Limited | Wholesale & retail | 2023 |
| BD Property Development Ltd | Real estate | 2025 |
| Bdbiz UK Limited | Hospitality | 2011 |
| BDC News Desk Ltd | Information & communication | 2026 |
| BDG Property Management Limited | Real estate | 2009 |
| BDI Films Limited | Professional & scientific | 2020 |
| BDL Builders Ltd | Construction | 2025 |
| BDM Estates Limited | Real estate | 2023 |
| BDR Glass Limited | Construction | 2025 |
| BDS Automotive London Ltd | Administrative & support | 2024 |
| BDS NO2 Ltd | Real estate | 2017 |
| BDS Services PVT Ltd | Information & communication | 2018 |
| Bdss Investment Ltd | Real estate | 2024 |
| BE 92 | Other services | 2019 |
| BE IT Services Ltd | Other services | 2024 |
| BE One E-Commerce Limited | Wholesale & retail | 2026 |
| Be-Active Europe Ltd | Wholesale & retail | 2015 |
| Beachfield Properties Limited | Real estate | 2003 |
| Beacon Education Services Trading Ltd | Education | 2017 |
| Beacon Multi-Academy Trust Limited | Education | 2011 |
| Beacon Real Estate Ltd | Real estate | 2023 |
| Beacondale Homes Ltd | Real estate | 2020 |
| Beaconstrate Ltd | Construction | 2022 |
| Beam Civil Engineering Ltd | Construction | 2020 |
| Beams Cars Ltd | Wholesale & retail | 2023 |
| Bean & Bento Ltd | Hospitality | 2023 |
| Beani Bazar Welfare Trust UK | Other services | 2011 |
| Bear BRO Drylining Ltd | Construction | 2018 |
| Bear the Brunt CIC | Education | 2026 |
| Bear Trades Ltd | Wholesale & retail | 2024 |
| Bearforce Drywall Ltd | Construction | 2025 |
| Beasy Clean Ltd | Administrative & support | 2026 |
| Beasyx Ltd | Construction | 2022 |
| Beatonix Limited | Wholesale & retail | 2025 |
| Beatrice Court Management Limited | Households | 1989 |
| Beatty Property Limited | Real estate | 2021 |
| Beau Ella Properties Ltd | Real estate | 2024 |
| Beaucatcher Limited | Other services | 2004 |
| Beaufort Estates Limited | Real estate | 2019 |
| Beauproperties & Development Ltd | Real estate | 2019 |
| Beaute Boudoir Ltd | Other services | 2021 |
| Beautifier London Ltd | Other services | 2024 |
| Beautiful Blush Limited | Arts & recreation | 2021 |
| Beautshijabs Ltd | Wholesale & retail | 2021 |
| Beauty Abaya Ltd | Wholesale & retail | 2023 |
| Beauty Beneath Limited | Other services | 2011 |
| Beauty Building Solutions Ltd | Construction | 2019 |
| Beauty by Neelam Ilford Limited | Hospitality | 2013 |
| Beauty by SK Sandhu Ltd | Other services | 2025 |
| Beauty Logistics Limited | Wholesale & retail | 2018 |
| Beauty Lounge by Nicole Ltd | Extraterritorial | 2018 |
| Beauty Palace (UK) Ltd | Other services | 2011 |
| Beauty Plus (UK) Ltd | Other services | 2006 |
| Beauty Spot (Ilford Lane) Ltd | Other services | 2025 |
| Beauty Spot (Ilford) Ltd | Other services | 2011 |
| Beauty Suite Salon Ltd | Other services | 2022 |
| Beauty Temptations Limited | Other services | 2014 |
| Beauty Traders UK Ltd | Wholesale & retail | 2020 |
| Beauty Whale Limited | Wholesale & retail | 2025 |
| Beautybysaj Limited | Other services | 2017 |
| Beautychem Limited | Wholesale & retail | 2008 |
| Beautyquenn Limited | Wholesale & retail | 2024 |
| Bebac Investment Group Ltd | Construction | 2020 |
| BEBO12 Ltd | Transport & logistics | 2020 |
| Bebyson Ltd | Construction | 2020 |
| BEC 14 Ltd | Administrative & support | 2017 |
| Becauze Construction Ltd | Construction | 2015 |
| Beckleigh Limited | Real estate | 2009 |
| Becontree Estates Ltd | Real estate | 2016 |
| Bedia Property Ltd | Real estate | 2023 |
| Bedrock Dwellings Limited | Real estate | 2018 |