| Brabco 2107 Limited | Professional & scientific | 2021 |
| Brabco 2403 Limited | Professional & scientific | 2024 |
| Brabco 620 Limited | Professional & scientific | 2006 |
| Brabco 724 Limited | Construction | 2007 |
| Brabco 809 Limited | Extraterritorial | 2008 |
| Brabners Directors Limited | Professional & scientific | 2001 |
| Brabners Investments Limited | Financial services | 2025 |
| Brabners LLP | | 2004 |
| Brabners Nominees Limited | Professional & scientific | 2001 |
| Brabners Secretaries Limited | Professional & scientific | 2001 |
| Brabners Trust Corporation Limited | Administrative & support | 2025 |
| Braceurself Limited | Health & social care | 2011 |
| Brack Construction Limited | Construction | 2020 |
| Brack Group Limited | Financial services | 2020 |
| Brack Homes Holdings Limited | Financial services | 2024 |
| Brack Homes Limited | Real estate | 2024 |
| Bracken Booth Limited | Professional & scientific | 2025 |
| Brackenview Developments Limited | Real estate | 1998 |
| Bracks Construction Limited | Construction | 2017 |
| Brad Kella Productions Limited | Information & communication | 2026 |
| Brad P Limited | Construction | 2016 |
| Bradco Holdings Limited | Real estate | 2021 |
| Bradgamefit Ltd | Health & social care | 2024 |
| Bradley J.Lewis Financial Solutions Limited | Financial services | 2004 |
| Bradshaw Mortgages Ltd | Financial services | 2014 |
| Brady Building & Electrical Ltd | Construction | 2017 |
| Brady Capital Limited | Administrative & support | 2019 |
| Brady Utility Services Limited | Construction | 2008 |
| Braes Consulting Limited | Financial services | 2012 |
| Braewood Ltd | Construction | 2017 |
| Braga Motors Ltd | Wholesale & retail | 2026 |
| Brain Lady Ltd | Professional & scientific | 2022 |
| Brain Melt Group Ltd | Manufacturing | 2022 |
| Brain Pinches Ltd | Health & social care | 2022 |
| Brains Powered by Music CIC | Health & social care | 2023 |
| Braithwaite Fit OUT Limited | Construction | 2011 |
| Braithwaite Group Ltd | Construction | 2015 |
| Braithwaite Property Company Limited | Households | 1958 |
| Braithwaite Property Investment Limited | Real estate | 2007 |
| Bramall Accounting Services Ltd | Professional & scientific | 2025 |
| Bramar Logistics Limited | Transport & logistics | 2022 |
| Bramble Berries Ltd | Hospitality | 2022 |
| Bramble Property Holdings Limited | Real estate | 2025 |
| Bramhall Roofing &Cladding Ltd | Construction | 2019 |
| Bramley Builders Limited | Construction | 2021 |
| Bramley Corporation Ltd | Professional & scientific | 2009 |
| Bramley Moore Hotel Ltd | Hospitality | 2025 |
| Bramleys Cafe Ltd | Hospitality | 2023 |
| Brammer Offshore Services Ltd | Other services | 2025 |
| Bramshaw Golf Club Limited | Professional & scientific | 1953 |
| Branche OUT Consultancy Limited | Administrative & support | 2022 |
| Brancker Tree Services Ltd | Administrative & support | 2026 |
| Brancote Business Services Ltd | Administrative & support | 2022 |
| Brand & Glory UK Ltd | Professional & scientific | 2020 |
| Brand Butter Ltd | Professional & scientific | 2023 |
| Brand Central HQ Ltd | Professional & scientific | 2019 |
| Brand Connect Partners Ltd | Administrative & support | 2026 |
| Brand Connections Group Ltd | Wholesale & retail | 2014 |
| Brand Edition UK Ltd | Professional & scientific | 2025 |
| Brand Graphix Ltd | Manufacturing | 2021 |
| Brand JAM Creative Studio Ltd | Professional & scientific | 2025 |
| Brand LAD Ltd | Wholesale & retail | 2021 |
| Brand Mark Solutions Ltd | Wholesale & retail | 2022 |
| Brand New Co (332) Limited | Professional & scientific | 2006 |
| Brand New Solutions Limited | Health & social care | 2017 |
| Brand Rocks Marketing Limited | Professional & scientific | 2016 |
| Brand Worth Apparel Ltd | Professional & scientific | 2026 |
| Brandalley UK Limited | Wholesale & retail | 1999 |
| Brandbuildr Ltd | Wholesale & retail | 2016 |
| Brandburns Ltd | Real estate | 2024 |
| Branded Furniture Outlet Limited | Wholesale & retail | 2018 |
| Branded Markets Ltd | Wholesale & retail | 2025 |
| Brandedsweets Ltd | Manufacturing | 2025 |
| Brandies Digital Ltd | Information & communication | 2025 |
| Brandon Ashton Enterprises Limited | Professional & scientific | 2025 |
| Brandon Land (General Partner) Limited | Real estate | 2012 |
| Brandon Road Solar Limited | Energy | 2022 |
| Brandon's (NW) Limited | Manufacturing | 2019 |
| Brandooku Retail Limited | Wholesale & retail | 2023 |
| Branhome Properties Limited | Real estate | 2020 |
| Brannac Mann Limited | Administrative & support | 2010 |
| Brannigan Holdings Ltd | Financial services | 2025 |
| Branstock Property Developments Ltd | Real estate | 2025 |
| Brantones Holdings Limited | Financial services | 2024 |
| Brantones NW Ltd | Construction | 2024 |
| Brasenose Bodyshop Limited | Wholesale & retail | 2020 |
| Brasil General Services Ltd | Other services | 2024 |
| Brass Monkey Liverpool Ltd | Hospitality | 2017 |
| Brasserie DE Flandre UK - Belgian Beer Import Ltd | Wholesale & retail | 2024 |
| Brat Aesthetics UK Ltd | Other services | 2021 |
| Braun ET Ltd | Arts & recreation | 2025 |
| Braunston LEA Management Limited | Households | 1999 |
| Brava Active Ltd | Professional & scientific | 2025 |
| Brave OR Stupid Limited | Extraterritorial | 2015 |
| Braventixor Ltd | Wholesale & retail | 2025 |
| Bravo Food L15 Ltd | Hospitality | 2026 |
| Bravo Goods Ltd | Hospitality | 2026 |
| Bravo Kirkdale Ltd | Real estate | 2021 |
| Bravo Nice Pizza Ltd | Hospitality | 2024 |
| Bravo Oldswan Ltd | Real estate | 2021 |