| Broad Aspect (Management) Co.Limited | Households | 1970 |
| Broad Fintech Ltd | Financial services | 2019 |
| Broad Meadow Ventures Ltd | Administrative & support | 2026 |
| Broad View Saas Limited | Information & communication | 2025 |
| Broadfarm Developments Ltd | Other services | 2019 |
| Broadfield Londis Ltd | Wholesale & retail | 2007 |
| Broadfields Global Holdings Limited | Financial services | 2026 |
| Broadgate Saas Ltd | Information & communication | 2025 |
| Broadhaven Property Company Limited | Real estate | 1954 |
| Broadlands Partnership Ltd | Financial services | 2001 |
| Broadley Investment 18 Limited | Real estate | 2013 |
| Broadstrike Ltd | Financial services | 2025 |
| Broadview World Limited | Wholesale & retail | 2024 |
| Broadwalk Property Management Ltd | Real estate | 2011 |
| Broadway Bar and Grill Ltd | Hospitality | 2017 |
| Broadway Hall Limited | Public administration | 2023 |
| Broadway Inovators Limited | Wholesale & retail | 2024 |
| Broadway One Ltd | Construction | 2021 |
| Broadway Properties Cardiff Limited | Real estate | 2022 |
| BROADWAY68 Limited | Real estate | 2021 |
| Brock Global Limited | Real estate | 2025 |
| Brodies Coffee Co Limited | Hospitality | 2020 |
| Broga (UK) Limited | Other services | 2012 |
| BROK38 Limited | Financial services | 2018 |
| Broken Hare Limited | Administrative & support | 2014 |
| Brol Ltd | Wholesale & retail | 2017 |
| Broledco Investment Services Limited | Financial services | 2024 |
| Brollies and Parasols Ltd | Professional & scientific | 2010 |
| Bromax Electrical Services Ltd | Construction | 2022 |
| Bromfray Limited | Construction | 2020 |
| Bromley Beauty Ltd | Other services | 2025 |
| Bromley Boilers Ltd | Construction | 2019 |
| Bromley Rheumatology Ltd | Health & social care | 2019 |
| Brompton Distributions Limited | Wholesale & retail | 2018 |
| Brondesbury International Ltd | Wholesale & retail | 2011 |
| Bronllwyn Court Management Company Limited | Households | 1988 |
| Brontale Ltd | Education | 2025 |
| Bronti Systems Limited | Real estate | 2010 |
| Bronze City Stars Trading Limited | Wholesale & retail | 2025 |
| Bronze Star Group Limited | Real estate | 2018 |
| Bronzing (Accountants) Ltd | Professional & scientific | 2022 |
| Bronzing Shop Limited | Other services | 2019 |
| Bronzlo Ltd | Wholesale & retail | 2020 |
| Broodryk & Sons Developments Ltd | Construction | 2019 |
| Broodryk Lettings Limited | Real estate | 2025 |
| Brook Craft Limited | Construction | 2021 |
| Brook Electrics Ltd | Construction | 2015 |
| Brooke Style Limited | Construction | 2017 |
| Brookers Construction Ltd | Construction | 2019 |
| Brooklands (Dinas Powys) Management Company Limited | Households | 2006 |
| Brooklea Park Management Limited | Real estate | 1987 |
| Brooklinde Limited | Wholesale & retail | 2006 |
| Brooklyn Park Ltd | Transport & logistics | 2012 |
| Brooklyn Staffing Ltd | Administrative & support | 2019 |
| Brookoval Limited | Health & social care | 2018 |
| Brookpower Limited | Wholesale & retail | 2023 |
| Brooks Aesthetics Clinic Ltd | Other services | 2016 |
| Brooks TŶ Coffi Ltd | Hospitality | 2016 |
| Brookshuang's Limited | Wholesale & retail | 2021 |
| Brookson (5463C) Limited | Administrative & support | 2007 |
| Brookson 4700M (Shaws) Ltd | Real estate | 2018 |
| Brookstone Holdings Ltd | Wholesale & retail | 2026 |
| Brooksy Investments Ltd | Real estate | 2025 |
| Brookview Garden Maintenance Limited | Administrative & support | 2017 |
| Brookwood Design & Build Limited | Construction | 2017 |
| Broom Incentives Ltd | Wholesale & retail | 2006 |
| Broome Sports Ltd | Wholesale & retail | 2025 |
| Broomepom Limited | Health & social care | 2024 |
| Brope Access Solutions Ltd | Construction | 2022 |
| Broskis Ltd | Hospitality | 2018 |
| Brosnan's Quality Flooring Ltd | Wholesale & retail | 2018 |
| Brotectors Limited | Administrative & support | 2025 |
| Brother Brother Digital Ltd | Information & communication | 2023 |
| Brother Consultants Limited | Professional & scientific | 2008 |
| Brother Thai Bristol Limited | Hospitality | 2025 |
| Brother Thai Limited | Hospitality | 2018 |
| Brothers Group Trading Ltd | Wholesale & retail | 2025 |
| Brothers Roofing and Development Ltd | Construction | 2024 |
| Browbaruk Ltd | Other services | 2019 |
| Brown and Ward Limited | Wholesale & retail | 2018 |
| Brown Trade Fashion Limited | Wholesale & retail | 2026 |
| Brownbrogue Limited | Professional & scientific | 2012 |
| Brownhill Ltd | Wholesale & retail | 2002 |
| Browning Jones & Morris Limited | Wholesale & retail | 1924 |
| Browns Office Supplies Limited | Manufacturing | 2001 |
| Brownstown Consultancy Ltd | Financial services | 2019 |
| Brows & Beds Limited | Wholesale & retail | 2019 |
| Browti Limited | Wholesale & retail | 2025 |
| Broxley Limited | Financial services | 2024 |
| Brrepairs Ltd | Wholesale & retail | 2026 |
| BRS Electrical Solutions Ltd | Construction | 2025 |
| BRT Investments Limited | Transport & logistics | 2012 |
| BRT Workshops Ltd | Manufacturing | 2011 |
| Brtg Limited | Information & communication | 2016 |
| Bruar London Limited | Real estate | 2021 |
| Bruberg Ltd | Administrative & support | 2017 |
| Brufie Ltd | Information & communication | 2025 |
| Bruit Blanc Ltd | Professional & scientific | 2024 |
| Brunam Group PC | | 2017 |
| Brunel Plant Services Limited | Professional & scientific | 1973 |