| Brickpoint Properties Ltd | Real estate | 2026 |
| Bricks and Bvnks Limited | Information & communication | 2025 |
| Bridge Close Regeneration LLP | | 2018 |
| Bridge Close Regeneration Nominee Company Limited | Professional & scientific | 2020 |
| Bridgehouse Professional Services Ltd | Administrative & support | 2025 |
| Bridgeme Ltd | Professional & scientific | 2025 |
| Bridgepoint Limited | Professional & scientific | 1996 |
| Bridges 2 Change Limited | Professional & scientific | 2025 |
| Brieljay Childcare and Childminding Ltd | Health & social care | 2023 |
| Bright Artistry Ltd | Information & communication | 2018 |
| Bright Fire Services Ltd | Public administration | 2016 |
| Bright Future Tuition Ltd | Education | 2020 |
| Bright Hope Care Ltd | Health & social care | 2026 |
| Bright Lead Solutions Ltd | Administrative & support | 2019 |
| Bright Minds Club Ltd | Education | 2023 |
| Bright RIDE786 Limited | Wholesale & retail | 2021 |
| Brighter Day Cafe CIC | Health & social care | 2025 |
| Brightline Content Ltd | Information & communication | 2026 |
| Brightpath Academy Ltd | Education | 2023 |
| Brightside Cleaning Solutions Ltd | Administrative & support | 2018 |
| Brightway Children Services Limited | Health & social care | 2019 |
| Brightway Properties Limited | Real estate | 2021 |
| Brightx Accounting Ltd | Professional & scientific | 2013 |
| Brilliant Cleaning Limited | Other services | 2019 |
| Brimech Services Ltd | Construction | 2014 |
| Brinat Estates Limited | Real estate | 2021 |
| Brisket Co Smokehouse Ltd | Hospitality | 2024 |
| Brisky Clothing Ltd | Wholesale & retail | 2025 |
| Bristol Classical Pilates Ltd | Health & social care | 2026 |
| Bristol Heart Surgery Ltd | Health & social care | 2021 |
| Brit and Barny Ltd | Wholesale & retail | 2023 |
| Brit Certify Ltd | Other services | 2024 |
| Brit Electronics Ltd | Wholesale & retail | 2024 |
| Brit Express Ltd | Information & communication | 2023 |
| Brit INT Limited | Wholesale & retail | 2024 |
| Brit Shopfitters Holding Limited | Real estate | 2024 |
| Brit Shopfitters Limited | Construction | 2013 |
| Britania Homes Ltd | Real estate | 2022 |
| Britania Support Limited | Health & social care | 2024 |
| Britannia Byte Technology Ltd | Information & communication | 2023 |
| Britannia Export Consultants Limited | Wholesale & retail | 2011 |
| Britannia K9 Group Ltd | Transport & logistics | 2024 |
| Britannia Minicabs Ltd | Administrative & support | 2017 |
| Britannia Move Limited | Transport & logistics | 2024 |
| Britannia Residency Ltd | Real estate | 2020 |
| Britannia Textile Trade (PTY) Ltd | Wholesale & retail | 2016 |
| Britannica Properties Ltd | Real estate | 2018 |
| Britcan Business Solutions Ltd | Wholesale & retail | 2019 |
| Britco Food Ltd | Hospitality | 2024 |
| Brithaul London Ltd | Transport & logistics | 2025 |
| British Bangladeshi Women’S Organisation Ltd | Other services | 2023 |
| British Nigerian Councillors Community Interest Company | Other services | 2021 |
| Britmart Ltd | Wholesale & retail | 2025 |
| Britney Oulo Limited | Health & social care | 2025 |
| Britom Investments Limited | Real estate | 2022 |
| Briton Developments Ltd | Construction | 2021 |
| Britong UK Limited | Construction | 2021 |
| Britovo Limited | Wholesale & retail | 2025 |
| Britpol Services Ltd | Administrative & support | 2025 |
| Brits Security and FM Ltd | Wholesale & retail | 2017 |
| Brits Watch Security UK Limited | Administrative & support | 2019 |
| Britshield Security Service Limited | Administrative & support | 2025 |
| Brittix Ltd | Wholesale & retail | 2025 |
| Brixton Hill After-School Club Ltd | Health & social care | 2026 |
| BRJ Associates Ltd | Administrative & support | 2024 |
| Brjja Ltd | Health & social care | 2018 |
| BRK Painting & Decorating Ltd | Construction | 2025 |
| BRK Property Ltd | Real estate | 2025 |
| Broadband Excav Ltd | Construction | 2022 |
| Broadbirch Limited | Construction | 2025 |
| Broadhazel Limited | Construction | 2025 |
| Bromfelde Mews Limited | Construction | 2024 |
| Bronzeash Funeralcare Limited | Other services | 2025 |
| Brook Physiotherapy Limited | Other services | 2002 |
| Brook Springs Ltd | Health & social care | 2020 |
| Brooker Settled Estates Limited | Real estate | 1958 |
| Brookharbour Consultants Limited | Professional & scientific | 2025 |
| Brooklands Approach Romford Limited | Professional & scientific | 2003 |
| Brooklyn London Bagels Ltd | Hospitality | 2025 |
| Brookside Media Ltd | Information & communication | 2016 |
| Brookwest Limited | Other services | 2024 |
| Broomhill Homes Limited | Real estate | 2024 |
| Broomhill Maintenance Limited | Households | 1972 |
| Bros Coffee Ltd | Hospitality | 2021 |
| Bros Holdings Ltd | Financial services | 2020 |
| Bros Nest Capital Ltd | Real estate | 2025 |
| Bros Property Ltd | Real estate | 2020 |
| Brothers Builders Limited | Construction | 2007 |
| Brothers Hair Salon Limited | Other services | 2026 |
| Brothersgroup Ltd | Real estate | 2025 |
| Brova Ltd | Wholesale & retail | 2025 |
| Brow ME Limited | Other services | 2019 |
| Brown & Boujee Limited | Other services | 2019 |
| Brownsec Ltd | Administrative & support | 2022 |
| Brsc Ltd | Other services | 2016 |
| BRT Serv Ltd | Construction | 2026 |
| BRT Support Ltd | Administrative & support | 2024 |
| Bruna Stores Limited | Wholesale & retail | 2026 |
| Bruna Tolomeli Ltd | Manufacturing | 2021 |
| Brunkhorst & Co Ltd | Professional & scientific | 2026 |