| Brits Building Compliance Services Ltd | Professional & scientific | 2026 |
| Brits Construction Projects Limited | Construction | 2014 |
| Brits International Ltd | Information & communication | 2024 |
| Brits Merks UK Limited | Financial services | 2023 |
| Brits Property Services Ltd | Construction | 2024 |
| Brittain Clothing Company Ltd | Wholesale & retail | 2023 |
| Britwell Care Ltd | Health & social care | 2023 |
| Brix International Ltd | Real estate | 2026 |
| Brixit UK Ltd | Professional & scientific | 2019 |
| Brixton Home Store Ltd | Wholesale & retail | 2020 |
| Brju Properties Ltd | Real estate | 2021 |
| BRK Property Solutions Ltd | Real estate | 2021 |
| BRK Recycling Ltd | Water & waste | 2025 |
| BRL Properties Ltd | Administrative & support | 2022 |
| Broad Consultancy Limited | Professional & scientific | 2025 |
| Broadgate Developments Group Ltd | Construction | 2012 |
| Broadleaf Education Limited | Education | 2025 |
| Broadmead Resthome Ltd | Health & social care | 2004 |
| Broadsheet Media UK Limited | Information & communication | 2025 |
| Broadstairs Trading Limited | Hospitality | 2016 |
| Broadwalk Construction Ltd | Construction | 2023 |
| Broadway Foods Limited | Real estate | 2016 |
| Broadway Prosthodontics Limited | Health & social care | 2021 |
| Broadway Travel Property Services Limited | Real estate | 2011 |
| Broadwood Music Limited | Information & communication | 2014 |
| Broccoli Soup Limited | Administrative & support | 2019 |
| Brockhurst Investments Limited | Real estate | 2017 |
| Brockhurst Property Investments Limited | Real estate | 2022 |
| Brom's Taxi Service Ltd | Transport & logistics | 2024 |
| Broma 16 UK LLP | | 2020 |
| Brompton Air Ltd | Construction | 2024 |
| Brompton Grey Ltd | Financial services | 2020 |
| Bromwich Management Limited | Households | 1981 |
| Brook Avenue Limited | Financial services | 2013 |
| Brook Preventative Health Holdco Ltd | Financial services | 2026 |
| Brook Preventative Health Ltd | Health & social care | 2026 |
| Brook Road Development Limited | Construction | 2015 |
| Brook Street Group Ltd | Real estate | 2018 |
| Brook Way Community Biodiversity Project CIC | Arts & recreation | 2022 |
| Brooke Electrical Installations Limited | Construction | 2021 |
| Brooke House (Harrow) Management Company Limited | Real estate | 2005 |
| Brookfield CRT Freeholders Limited | Real estate | 2026 |
| Brookhaven Condominium Limited | Hospitality | 2025 |
| Brookhouse Interior Designs Limited | Real estate | 2017 |
| Brooking Associates Ltd | Other services | 2003 |
| Brookland Uxbridge Limited | Construction | 2024 |
| Brookside Properties (Bristol) Unlimited | Real estate | 2008 |
| Brooktask Limited | | 1980 |
| Brookvale PMP Ltd | Professional & scientific | 2022 |
| Broomfield Services Limited | Administrative & support | 2016 |
| Broomgrove and Portland Ltd | Real estate | 2020 |
| Brother Same Day Service Ltd | Transport & logistics | 2025 |
| Brotherly Investments Ltd | Real estate | 2013 |
| Brothers Auto Ltd | Wholesale & retail | 2026 |
| Brothers Maritime Limited | Transport & logistics | 2015 |
| Brothers Same Day Couriers Ltd | Transport & logistics | 2024 |
| Brothers Santikllari Plaster Ltd | Construction | 2021 |
| Brouhaha Entertainment Limited | Information & communication | 2021 |
| Brouhaha LEE Limited | Information & communication | 2022 |
| Brouhaha Sontag Limited | Information & communication | 2023 |
| Brow Boutique Ltd | Other services | 2019 |
| Brow Pharmacy Limited | Wholesale & retail | 2005 |
| Browett & Co Mortgage Services Limited | Financial services | 2021 |
| Brown Bear Estates Limited | Real estate | 2023 |
| Brown Finch Limited | Real estate | 2026 |
| Brown Gold Limited | Professional & scientific | 2007 |
| Brownstone Ventures Ltd | Financial services | 2024 |
| BRS Capital Holdings Limited | Financial services | 2026 |
| BRS Studio Limited | Manufacturing | 2018 |
| BRU NO1 Ltd | Wholesale & retail | 2026 |
| Bruijn Solutions Ltd | Transport & logistics | 2021 |
| Brunel Property Group Ltd | Construction | 2019 |
| Brunini Development Ltd | Construction | 2024 |
| Brunini Properties Ltd | Real estate | 2023 |
| Brunnur Limited | Professional & scientific | 2017 |
| Brush & Brighten Ltd | Construction | 2024 |
| Brushwood Developments Limited | Construction | 2024 |
| Bruton Place Estates Ltd | Real estate | 2011 |
| Brutus Properties Ltd | Real estate | 2021 |
| Bryanston Capital Limited | Professional & scientific | 2005 |
| Bryant Health Limited | Health & social care | 2024 |
| Bryher Construction Ltd | Professional & scientific | 2019 |
| BS Power Solutions Ltd | Construction | 2026 |
| BSA Building Solution Ltd | Construction | 2017 |
| Bsanq Jewellery Ltd | Wholesale & retail | 2015 |
| Bsbi Property Limited | Real estate | 2020 |
| Bscm Install Pro Ltd | Construction | 2015 |
| Bsepartners Ltd | Professional & scientific | 2012 |
| BSG Jazz Ltd | Information & communication | 2019 |
| BSK Consulting Ltd | Administrative & support | 2023 |
| BSL Care Services Ltd | Health & social care | 2025 |
| Bsml UK Ltd | Hospitality | 2025 |
| BSN Social Care Ltd | Health & social care | 2014 |
| BSN Supported Living Ltd | Financial services | 2023 |
| Bsrc Motors Ltd | Wholesale & retail | 2018 |
| BSS Solutions Ltd | Health & social care | 2012 |
| Bssealants Ltd | Construction | 2023 |
| BST Burn Steel Tube Limited | Wholesale & retail | 2017 |
| BST Property Ltd | Real estate | 2021 |
| BT Frying Kitchen Ltd | Hospitality | 2026 |