| Beverley Court (Hounslow) Residents' Company Limited | Households | 1966 |
| Beverly Hills Cars & Chauffeur Services Limited | Transport & logistics | 2002 |
| Bewbush Estates Limited | Construction | 2025 |
| Bexhill's Emporium Ltd | Wholesale & retail | 2021 |
| Bexo Motors Ltd | Wholesale & retail | 2026 |
| Beyond Braeburn Ltd | Real estate | 2024 |
| Beyond Commerce Limited | Wholesale & retail | 2025 |
| Beyond Dining UK Ltd | Hospitality | 2023 |
| Beyond Romania CIC | Administrative & support | 2026 |
| Beyond the Boundary Ltd | Wholesale & retail | 2023 |
| Beyond the Moves Limited | Arts & recreation | 2019 |
| Beyounik Consultancy Services Limited | Information & communication | 2021 |
| BG Cargo Limited | Wholesale & retail | 2024 |
| BG CFO Consulting Limited | Professional & scientific | 2024 |
| BG Drylining Ltd | Construction | 2019 |
| BG Events Group Limited | Hospitality | 2025 |
| BG Food Trade Ltd | Wholesale & retail | 2017 |
| BG Trade Limited | Wholesale & retail | 2016 |
| Bg's Hair, Beauty & Laser Centre Ltd | Other services | 2014 |
| BGB Consultancy Services Ltd | Information & communication | 2014 |
| BGO Property Services Limited | Real estate | 2026 |
| BH (Bath) Limited | Construction | 2013 |
| Bhagtana Ltd | Construction | 2022 |
| Bhandal Beers Ltd | Hospitality | 2025 |
| Bhansali Infotech Limited | Information & communication | 2011 |
| Bharadia Autos(Uk) Ltd | Wholesale & retail | 2022 |
| Bharat and Sheela Gandhi, Astrologers and Palmists Limited | Other services | 2012 |
| Bharat Exim Ltd | Wholesale & retail | 2024 |
| Bharathi OIL Ltd | Wholesale & retail | 2018 |
| Bharatiya Bhojan Limited | Hospitality | 2023 |
| Bhartiya Enterprises Limited | Health & social care | 2010 |
| Bhav Gardening and Landscaping Ltd | Wholesale & retail | 2026 |
| Bhavani Imports(Uk) Limited | Wholesale & retail | 2025 |
| Bhullar & Co (Osteopaths) Ltd | Health & social care | 2001 |
| BI Insight Solutions Limited | Information & communication | 2016 |
| BIA Esports Ltd | Wholesale & retail | 2024 |
| Bianco Plumbing & Heating Ltd | Construction | 2020 |
| Biaw Care Services Ltd | Health & social care | 2023 |
| Bible Study Box Ltd | Wholesale & retail | 2024 |
| Bica Properties Limited | Real estate | 2023 |
| Bickleys Finest Limited | Other services | 2020 |
| Bidas Properties Ltd | Real estate | 2026 |
| Biddy Bright Minds Ltd | Health & social care | 2025 |
| Bidhaar Ltd | Wholesale & retail | 2019 |
| Big BEN Shoes Limited | Wholesale & retail | 2021 |
| Big Boys Towing Ltd | Transport & logistics | 2025 |
| Big Bruda Community Interest Company | Education | 2026 |
| Big Ears Entertainment Ltd. | Administrative & support | 2009 |
| Big Handbag Shop Ltd | Wholesale & retail | 2013 |
| Big Locker Hire Co. Limited | Administrative & support | 2016 |
| Big Mikes Calypso Kitchen Ltd | Hospitality | 2017 |
| Big P Sounds Ltd | Manufacturing | 2024 |
| Bigg Driving School Ltd | Education | 2026 |
| Bigoudi Hair Ltd | Other services | 2021 |
| Bijear Trade Limited | Health & social care | 2018 |
| Bike&Bite Limited | Hospitality | 2025 |
| Bikkai Ltd | Information & communication | 2014 |
| Bill Greenwood Ltd | Professional & scientific | 2010 |
| Bill Jacklin Limited | Wholesale & retail | 2024 |
| Billionaire Baby Club Limited | Wholesale & retail | 2022 |
| Billioni Culture Media Co., Ltd | Wholesale & retail | 2025 |
| Billy’S Catering Ltd | Wholesale & retail | 2024 |
| Billzsound Limited | Wholesale & retail | 2025 |
| Bilt Renovation Limited | Construction | 2022 |
| Biltree Ltd | Construction | 2023 |
| Bimmax Limited | Health & social care | 2025 |
| Bimserve Ltd | Information & communication | 2019 |
| Bin-Seena Health Limited | Construction | 2007 |
| Binary Concept Ltd | Information & communication | 2023 |
| Binch London Ltd | Professional & scientific | 2022 |
| Bingham Close Management Company Limited | Households | 2005 |
| Bino Hospitality Ltd | Hospitality | 2023 |
| Binoosbinu Associates Ltd | Construction | 2016 |
| Binswood News Limited | Wholesale & retail | 2014 |
| Bintu Limited | Professional & scientific | 2006 |
| Bioadvizor Limited | Other services | 2023 |
| Biobalance Healthcare Limited | Manufacturing | 2023 |
| Biocode Consultancy Limited | Professional & scientific | 2023 |
| Biodata Cave Limited | Information & communication | 2020 |
| Bioko Global Solutions Ltd | Financial services | 2022 |
| Biorosary UK Medical Investment Limited | Health & social care | 2020 |
| Biosun Finance Limited | Professional & scientific | 2020 |
| Biotic Crest Ltd | Wholesale & retail | 2025 |
| Biowell Health Ltd | Health & social care | 2022 |
| Biowell Performance Medicine Ltd | Health & social care | 2025 |
| Bipartite Ltd | Professional & scientific | 2019 |
| Birch Court (Management) Company Limited | Households | 1981 |
| Birch Grove (Silver END) Management Company Limited | Households | 1982 |
| Birch House Resident Limited | Households | 2005 |
| Birch House RTM Company Limited | Households | 2024 |
| Birchdale Court Residents Company Limited | Households | 2005 |
| Birchfield Court Swinton Management Company Limited | Households | 2022 |
| Birchfield Property Management Limited | Hospitality | 1995 |
| Birchitt Court Management Company Limited | Households | 2026 |
| Bird's Restaurant + Bar Limited | Hospitality | 2024 |
| Birdbox TM Limited | Hospitality | 2025 |
| Birdhurst Ltd | Real estate | 2016 |
| Birkdale Gardens Residents Association Limited | Households | 1992 |
| Birklands (Storrington) Residents Company Ltd | Households | 2004 |
| Birks Bristol Ltd | Hospitality | 2016 |