| Brand Imaging Solutions Limited | Financial services | 2005 |
| Brand Packaging Limited | Extraterritorial | 2015 |
| Brandhoo Group Limited | Wholesale & retail | 2025 |
| Brantones Limited | Construction | 1990 |
| Brantwood Furniture Limited | Manufacturing | 2023 |
| Braudit IP Ltd | Information & communication | 2024 |
| Bread & Butties Home Ltd | Hospitality | 2026 |
| Breathchamps CIC | Health & social care | 2020 |
| Brentwood Community College | Education | 2016 |
| Brewd.Sale Ltd | Manufacturing | 2026 |
| Brian Clancy Higby Partnership Limited | Professional & scientific | 2005 |
| Brick and Bolt Ltd | Real estate | 2026 |
| Bridge Corporate Finance Limited | Financial services | 2006 |
| Bridgeman Creative Ltd | Professional & scientific | 2022 |
| Bridgemere Construction Ltd | Construction | 2026 |
| Bridgewater Campers Ltd | Wholesale & retail | 2012 |
| Bridgewater Gate Management (NW) Ltd | Real estate | 2019 |
| Bridgewater Point Management (NW) Ltd | Real estate | 2019 |
| Bright 4 Futures Limited | Administrative & support | 2019 |
| Bright Laundry Ltd | Other services | 2023 |
| Brighten Builders Ltd | Construction | 2023 |
| Brighten Properties Ltd | Real estate | 2021 |
| Brighton & Hove Clean Team Limited | Administrative & support | 2025 |
| Brightpoint Investments Ltd | Households | 2012 |
| Brightsense Ltd | Wholesale & retail | 2025 |
| Brilly Group Limited | Information & communication | 2022 |
| Brioo Ltd | Information & communication | 2024 |
| British Time Investments Ltd | Real estate | 2024 |
| British Time Language Schools Ltd | Professional & scientific | 2021 |
| BRM Food Ltd | Wholesale & retail | 2024 |
| Broadbranch Limited | Financial services | 1976 |
| Broadcast Associates Limited | Information & communication | 2011 |
| Broadcast Freeloader Limited | Information & communication | 2016 |
| Broadheath Recovery Services Limited | Transport & logistics | 2008 |
| Broadleaf Garden Projects Ltd | Administrative & support | 2025 |
| Broadoak Financial Planning Ltd | Financial services | 2020 |
| Brobrosfit Limited | Professional & scientific | 2026 |
| Bromley Motors Limited | Wholesale & retail | 2023 |
| Bronagh Townsend Limited | Arts & recreation | 2026 |
| Brongash Global Resources Ltd | Wholesale & retail | 2013 |
| Brookhouse (Alexandra) Limited | Construction | 2011 |
| Brookhouse (Ashford) Limited | Real estate | 2002 |
| Brookhouse (Bradford) Limited | Real estate | 2000 |
| Brookhouse (Christchurch) Limited | Real estate | 2003 |
| Brookhouse (Dumfries) Limited | Real estate | 2001 |
| Brookhouse (Hamilton) Limited | Real estate | 2002 |
| Brookhouse (Leigh) Limited | Real estate | 2014 |
| Brookhouse (Lowestoft) Limited | Real estate | 2002 |
| Brookhouse (Lowestoft) Nominees V Limited | Real estate | 2016 |
| Brookhouse (Lowestoft) Nominees VI Limited | Real estate | 2016 |
| Brookhouse (Manchester) Limited | Real estate | 2001 |
| Brookhouse (Prescot) Limited | Real estate | 2003 |
| Brookhouse (Preston) Limited | Real estate | 2009 |
| Brookhouse Builders Limited | Professional & scientific | 1990 |
| Brookhouse Chichester Limited | Real estate | 2001 |
| Brookhouse Developments Limited | Construction | 2010 |
| Brookhouse Estates Limited | Real estate | 1933 |
| Brookhouse Group Limited | Real estate | 1988 |
| Brookhouse Helsby (Retail) Limited | Real estate | 2011 |
| Brookhouse Helsby Limited | Real estate | 2000 |
| Brookhouse Homes (Number 1) Limited | Real estate | 1965 |
| Brookhouse Northern Limited | Real estate | 1989 |
| Brookhouse Properties Limited | Financial services | 1996 |
| Brookhouse Property Holdings Limited | Financial services | 2001 |
| Brookhouse Retail Limited | Real estate | 1998 |
| Brookhouse Stud Limited | Agriculture & fishing | 1988 |
| Brookies Removals, Transport and Storage Limited | Transport & logistics | 2021 |
| Brookland Management Limited | Households | 1987 |
| Brooklands MCR Ltd | Real estate | 2018 |
| Brooklands Property Management (NW) Ltd | Real estate | 2017 |
| Brooklands Realty Limited | Construction | 2023 |
| Brooklands Sports Club Limited | Arts & recreation | 2017 |
| Brooklawn Capital Investments Limited | Real estate | 2013 |
| Brooksways Minibuses Limited | Transport & logistics | 2010 |
| Brookwood Services Ltd | Health & social care | 2019 |
| Broomstyx Limited | Administrative & support | 2021 |
| Broskis Sale Limited | Hospitality | 2024 |
| Brotherhood Industries Ltd | Information & communication | 2023 |
| Brownhill Fire Solutions Limited | Administrative & support | 2011 |
| Browns Leisure Limited | Hospitality | 2018 |
| Broxiom Constructions Ltd | Construction | 2026 |
| Brunton Bros. Builders Limited | Construction | 2005 |
| BTD Limited | Information & communication | 2018 |
| BTJ Solutions Limited | Professional & scientific | 2022 |
| BTS Property Ltd | Real estate | 2019 |
| Buboo Limited | Professional & scientific | 2010 |
| Buchanan & Company Financial Services Limited | Financial services | 2020 |
| Buchanan & Company Trustees Limited | Professional & scientific | 2021 |
| Buchanan & Company Wills and Estates Limited | Professional & scientific | 2021 |
| Buchanan and Company Limited | Information & communication | 1998 |
| Budzynski Solutions Limited | Professional & scientific | 2024 |
| Build Evolution Ltd. | Construction | 2020 |
| Building Environment Control Limited | Information & communication | 1989 |
| Buildondontmoveon.Com Ltd | Professional & scientific | 2011 |
| Built to Connect Ltd | Construction | 2026 |
| Bulls Head Davenham Ltd | Hospitality | 2021 |
| Burdett Court Management Company Limited | Households | 1999 |
| Burford Property Limited | Construction | 2020 |
| Burgess House Management (NE) Ltd | Real estate | 2019 |
| Burlam House Limited | Health & social care | 2015 |