| Bright LAB Creations Ltd | Information & communication | 2014 |
| Bright Light London Limited | Other services | 2026 |
| Bright Lights Capital Limited | Financial services | 2011 |
| Bright Mark Cleaning Ltd | Administrative & support | 2025 |
| Bright Morning Services Limited | Other services | 2015 |
| Bright Seasons Holdings Ltd | Real estate | 2021 |
| Bright Shape | Education | 2018 |
| Bright Star Services Limited | Administrative & support | 2019 |
| Bright Travel Services Limited | Administrative & support | 2017 |
| Brighter Days Nursery Ltd | Health & social care | 2025 |
| Brighter Kiddies Ltd | Health & social care | 2025 |
| Brighter Life (UK) | Health & social care | 2013 |
| Brighter Sparks Ltd. | Construction | 2015 |
| Brighter Ventures Ltd | Professional & scientific | 2026 |
| Brightfire Pictures Ltd | Information & communication | 2024 |
| Brightlabs Limited | Education | 2025 |
| Brightline Talent Ltd | Administrative & support | 2025 |
| Brightmind Associates Limited | Administrative & support | 2025 |
| Brightminds Tutors Ltd | Education | 2026 |
| Brighton Accommodation Ltd | Real estate | 2017 |
| Brightsmile Dental Care Ltd | Health & social care | 2009 |
| Brightstar Homecare Limited | Health & social care | 2021 |
| Brigstowe Apartments Management Company Limited | Households | 2017 |
| Brilliant Masterful Transcripts Ltd | Information & communication | 2020 |
| Brimena Creatives Ltd | Manufacturing | 2025 |
| Brindhu Fuel Limited | Wholesale & retail | 2025 |
| Bring Biscuits Ltd | Professional & scientific | 2017 |
| Brinksman Carpentry & Building Limited | Construction | 2014 |
| Brinsley (Old Mill Farm) Management Company Limited | Households | 2022 |
| Brisk Ventures Ltd | Real estate | 2025 |
| Brit Drive Exports Ltd | Wholesale & retail | 2025 |
| Brit Packaging and Logistics Ltd | Manufacturing | 2018 |
| Brit School Productions Limited | Education | 1993 |
| Britannia Bazaar Group Limited | Wholesale & retail | 2025 |
| Britannia Bazaar Limited | Wholesale & retail | 2023 |
| Britannia Mews Management Company Limited | Households | 2015 |
| Britannic Security & Facilities Management Ltd | Administrative & support | 2022 |
| Brite Constructions Limited | Construction | 2010 |
| Britiko Ltd | Professional & scientific | 2013 |
| British Bangladeshi Sports Association CIC | Education | 2024 |
| British-Bangladeshi Sports Awards CIC | Education | 2024 |
| Britlab UK Ltd | Wholesale & retail | 2023 |
| Briton Court Management Company Limited | Households | 1983 |
| Britonbites Studio Ltd | Wholesale & retail | 2025 |
| Brix London Limited | Administrative & support | 2018 |
| Brixton Auto Centre Limited | Wholesale & retail | 2011 |
| Brixton BID Limited | Other services | 2012 |
| BRM Capital Investments Ltd | Real estate | 2024 |
| BRO Enterprises Limited | Wholesale & retail | 2026 |
| BRO With a Sign Ltd | Administrative & support | 2025 |
| Broad Green Trading Ltd | Real estate | 2017 |
| Broadband Solutions (London) Limited | Information & communication | 2002 |
| Broadcast Warehouse Limited | Manufacturing | 1999 |
| Broadfield Management Company Limited | Households | 1989 |
| Broadlands Management (Swinton) Limited | Households | 1987 |
| Broadlands Management Company Limited | Households | 1995 |
| Broadsword Risk Holdings Ltd | Financial services | 2019 |
| Broadsword Risk Services Limited | Financial services | 2020 |
| Broadwater Lane Management Limited | Households | 2006 |
| Broadway (Morecambe) Management Company Ltd | Households | 2017 |
| Broadway (Silver END) Management Company Limited | Households | 1982 |
| Broadway Costs Consult Ltd | Professional & scientific | 2017 |
| Broadway Entertainment Limited | Administrative & support | 2017 |
| Broadway Luxe Ltd | Transport & logistics | 2026 |
| Brockley Auto Services Limited | Wholesale & retail | 2025 |
| Brockley MOT Centre Limited | Wholesale & retail | 2019 |
| Broken Records Ltd | Arts & recreation | 2018 |
| Broken Warrior Ltd | Professional & scientific | 2025 |
| Brollies Unique Ltd | Wholesale & retail | 2024 |
| Bromley Best Resi Limited | Financial services | 2025 |
| Bromley Cross Mini-Mart Limited | Wholesale & retail | 2005 |
| Bromley Vehicle Test Centre Limited | Wholesale & retail | 2010 |
| Bromleydrivingschool and Property Development Ltd | Education | 2025 |
| Bron Y Castell (Abergele) Management Company Ltd | Households | 2018 |
| Brook Court (Shepshed) Management Company Limited | Households | 2007 |
| Brook House (Solsbury Park) Management Company Limited | Households | 2006 |
| Brook House Havelock Road Management Limited | Households | 1976 |
| Brook Village Management Company (Greenwich) Limited | Households | 2000 |
| Brookes Park (Monton) Management Company Limited | Households | 2006 |
| Brookfield Close (Horsham) Limited | Households | 2016 |
| Brookland Consultancy Ltd | Professional & scientific | 2025 |
| Brooklands Grove (Weybridge) Residents Management Company Limited | Households | 2025 |
| Brooklyn Auto Centre Ltd | Wholesale & retail | 2026 |
| Brooklyn Automotive Ltd | Wholesale & retail | 2026 |
| Brooklyn House Management Limited | Households | 1991 |
| Brooklyn Law (Holdings) Limited | Administrative & support | 2020 |
| Brooklyn Law Limited | Professional & scientific | 2016 |
| Brookmead Residents Management Company Limited | Households | 2013 |
| Brookscroft Woodland Limited | Agriculture & fishing | 2007 |
| Brookwood Mews Management Company Limited | Households | 1990 |
| Brookwood Spinney Management Company Limited | Households | 1998 |
| Broomfield Court (Stratford) Management Company Limited | Households | 2002 |
| Broomsquires Management Company Limited | Households | 2008 |
| Brother Cutz Limited | Other services | 2026 |
| Brother Laundry Limited | Other services | 2023 |
| Brothers E&E Ltd | Real estate | 2025 |
| Brothers Kebab Addiscombe Ltd | Hospitality | 2019 |
| Brothers of Construction Ltd | Construction | 2025 |
| Broughton Astley Management Limited | Households | 1987 |
| Brow & Beauty Atelier Ltd | Other services | 2023 |