| Bridge the World Travel Consultants Ltd | Professional & scientific | 2024 |
| Bridgeland Estates Limited | Real estate | 2026 |
| Bridgeside Residents Association Limited | Professional & scientific | 1976 |
| Bridle Close (Bourton on the Water) Management Company Limited | Households | 2008 |
| Bridle Court Hempsted (Management) Limited | Households | 2008 |
| Bright Beyond Limited | Professional & scientific | 2009 |
| Bright Drinks Venues Ltd | Wholesale & retail | 2024 |
| Bright Futures Oxfordshire Ltd | Health & social care | 2011 |
| Bright Instrument Holdings Ltd | Financial services | 2013 |
| Bright Instrument Properties Ltd | Real estate | 2013 |
| Bright Sparks Industrial & Domestic Electricians Limited | Construction | 2004 |
| Brightborough Assets Limited | Administrative & support | 2014 |
| Brightborough Capital Limited | Financial services | 2009 |
| Brightborough Equipment Limited | Administrative & support | 2018 |
| Brightborough Group Limited | Financial services | 2019 |
| Brightborough Holdings Limited | Financial services | 2019 |
| Brightborough Property Limited | Real estate | 2013 |
| Brightbox Lighting Ltd | Wholesale & retail | 2008 |
| Brightdean Designs Limited | Information & communication | 1997 |
| Brightedge Technologies Limited | Professional & scientific | 2014 |
| Brighter Home Care Ltd | Administrative & support | 2018 |
| Brighter Legal Ltd | Professional & scientific | 2025 |
| Brighter Motor-Care Ltd | Wholesale & retail | 2025 |
| Brightsky Investments CLA Ltd | Real estate | 2025 |
| Brightsparks Recruitment Limited | Hospitality | 2003 |
| Brightweb IT Solutions Ltd | Information & communication | 2026 |
| Brigstow Independent Financial Planning Limited | Financial services | 2024 |
| Brilliant Stone Ltd | Wholesale & retail | 2024 |
| Brimblewood Management (NO 1) Limited | Households | 1991 |
| Bripco (UK) Limited | Information & communication | 2009 |
| Brissett Music Limited | Arts & recreation | 2011 |
| Bristol Aero Club | Arts & recreation | 2001 |
| Bristol ALL Golds Rlfc Limited | Professional & scientific | 2020 |
| Bristol BIN Cleaning Ltd | Information & communication | 2018 |
| Bristol Cardiologist Limited | Health & social care | 2015 |
| Brit AI Network Limited | Administrative & support | 2025 |
| Brit-Finn Purity Ltd | Hospitality | 2016 |
| Britain Express Limited | Professional & scientific | 2004 |
| Britannia Square Car Park Limited | Households | 2017 |
| Britannia Wharf Management (Bingley) Limited | Households | 2005 |
| Brite Recruitment (Nationwide) Ltd | Administrative & support | 2025 |
| Brite Recruitment (Regional) Limited | Administrative & support | 2025 |
| British Pasture Leather Limited | Wholesale & retail | 2021 |
| Britton Flat Roofing Limited | Construction | 2015 |
| Britzee PVT Ltd | Real estate | 2018 |
| Briz UK Ltd | Wholesale & retail | 2023 |
| Broad Oak Barns Ltd | Real estate | 2022 |
| Broad Oak Property Developments Limited | Construction | 2023 |
| Broad Street Holdings Ltd | Construction | 2021 |
| Broadbean Limited | Hospitality | 2014 |
| Broadholme Solar Farm Limited | Energy | 2022 |
| Broadmeadows (ST Breock) Management Company Limited | Real estate | 2012 |
| Broadway Wine Company (Trade) Ltd | Wholesale & retail | 2019 |
| Brockhampton Park Management Company Limited | Households | 1981 |
| Brockworth Consulting Limited | Professional & scientific | 2021 |
| Broddix Limited | Real estate | 2024 |
| Brodie Planning Associates Limited | Professional & scientific | 2013 |
| Broken Bear Limited | Arts & recreation | 2025 |
| Brompton House Property Limited | Real estate | 2003 |
| Bromsgrove Sporting Colts FC Limited | Arts & recreation | 2026 |
| Bronze Ridge Developments Limited | Real estate | 2023 |
| Brook Court Management (Cheltenham) Limited | Households | 2001 |
| Brookend Investments Limited | Real estate | 2025 |
| Brookfield-Scott Limited | Construction | 2020 |
| Brookforge Limited | Manufacturing | 1997 |
| Brookfurlongs Limited | Agriculture & fishing | 1973 |
| Brookhurst Limited | Real estate | 2016 |
| Brooklyn Club Limited | Hospitality | 1989 |
| Brookmead F.I.C Ltd | Financial services | 2024 |
| Brookmead Holdings Limited | Real estate | 2002 |
| Brooks Burrows Limited | Real estate | 2023 |
| Brooks Sourcing Ltd | Administrative & support | 2025 |
| Brookson (5947) Limited | Professional & scientific | 2007 |
| Brosna Civils Limited | Construction | 2020 |
| Brotherhood in Arms CIC | Health & social care | 2025 |
| Brothers in Shine Limited | Administrative & support | 2024 |
| Brothers-Emr Limited | Manufacturing | 2014 |
| BROTHERS2BUILD Ltd | Construction | 2025 |
| Broughton (Sevenoaks) Ltd | Other services | 2019 |
| Broughton Apartments Limited | Construction | 2021 |
| Brown Arbour Limited | Professional & scientific | 2012 |
| Brown Dog Works Limited | Construction | 2020 |
| Brownhouse Investment Limited | Real estate | 2019 |
| Brownhouse Properties Limited | Real estate | 2017 |
| Brownrigg@Home Limited | Wholesale & retail | 2008 |
| Brownview Partners Ltd | Administrative & support | 2018 |
| Bruce Lettings Limited | Real estate | 2021 |
| Bruce Solutions Ltd | Information & communication | 2025 |
| Bruckshaw Associates Limited | Administrative & support | 2001 |
| Bruern Game Supplies Limited | Arts & recreation | 2015 |
| Brush Farriery Services Limited | Manufacturing | 2005 |
| Bryant UAE Ltd | Administrative & support | 2024 |
| Bryce IT Consulting Ltd | Information & communication | 2023 |
| Bryngolwg Solar Ltd | Energy | 2022 |
| BSA Services Ltd | Financial services | 2016 |
| BSJ Creative Limited | Professional & scientific | 2021 |
| Bsmart-Ai Ltd | Information & communication | 2025 |
| Bsra Ltd | Financial services | 2022 |
| BST Electrical Holdings Ltd | Financial services | 2020 |
| BST Electrical Ltd | Construction | 2011 |