| Broom Boat Sales Limited | Extraterritorial | 2024 |
| Broom Boats Limited | Extraterritorial | 2024 |
| Broom Financial Ltd | Financial services | 2021 |
| Broom Holidays Limited | Extraterritorial | 2024 |
| Broom Life Ltd | Extraterritorial | 2023 |
| Broom Marine Group Limited | Extraterritorial | 2024 |
| Brother Foods Ltd | Hospitality | 2018 |
| Brother Hot Food Ltd | Hospitality | 2024 |
| Brother Taxi Ltd | Transport & logistics | 2021 |
| Brothers and Co Deliveries Ltd | Transport & logistics | 2024 |
| Brothers Barber Norwich Ltd | Other services | 2022 |
| Brothers Kebab & Pizza Ltd | Hospitality | 2021 |
| Brothers Village Limited | Hospitality | 2022 |
| Brough Studios Limited | Professional & scientific | 2024 |
| Broughton (E.A.) Developments Limited | Construction | 2013 |
| Brow Game Supplies Ltd | Agriculture & fishing | 2023 |
| Brown & Co Mortgage Advice Limited | Professional & scientific | 2018 |
| Brown & Co Trustees Limited | Financial services | 2022 |
| Brown & Co-Property and Business Consultants LLP | | 2002 |
| Brown & Jones (Norfolk) Ltd | Wholesale & retail | 2025 |
| Brown & Payne Ltd | Construction | 2010 |
| Brown Box Developments Ltd | Construction | 2021 |
| Brown JUG Ltd | Administrative & support | 2018 |
| Brown's Business Solutions Limited | Administrative & support | 2017 |
| Browne & Sons (Loddon) Limited | Wholesale & retail | 2019 |
| Browne Offshore Services Ltd | Mining & quarrying | 2019 |
| Browns Autos Brighton Ltd | Wholesale & retail | 2024 |
| Browns Film Ltd | Information & communication | 2022 |
| Browntech IT Services Ltd | Information & communication | 2015 |
| Browsers Bookshops Limited | Wholesale & retail | 2006 |
| BRS Development (Norwich) Limited | Construction | 2024 |
| BRS Groundworks Ltd | Construction | 2004 |
| Bruar Real Estate Group Limited | Financial services | 2021 |
| Brumstead Developments Limited | Construction | 2024 |
| Brundall Auto Ltd | Wholesale & retail | 2022 |
| Brundall Care Limited | Administrative & support | 2003 |
| Brundall Community Leisure Limited | Hospitality | 2020 |
| Brundall Gardens Marina Limited | Hospitality | 2022 |
| Brundall Swimming Pool Ltd | Arts & recreation | 2022 |
| Brunton Builders Ltd | Construction | 2015 |
| Bryan Bransom Contracting Limited | Transport & logistics | 2017 |
| Bryant Property Group Ltd | Construction | 2017 |
| Bsawhney Holdings Ltd | Financial services | 2015 |
| BSC Group Holdings Limited | Wholesale & retail | 2026 |
| BSD Production and Costumes Ltd | Wholesale & retail | 2021 |
| Bsdao (Cringleford) Ltd | Real estate | 2017 |
| BSN Properties Ltd | Real estate | 2016 |
| Bsnbuildingandcarpentry Ltd | Manufacturing | 2026 |
| BSP Engineering Services (UK) Ltd | Professional & scientific | 2011 |
| BST Endeavours Ltd | Administrative & support | 2024 |
| BT Advisory Limited | Professional & scientific | 2015 |
| Btac Services Ltd. | Education | 2005 |
| BTG Healthcare Solutions Ltd | Administrative & support | 2026 |
| BTK Healthcare and Supported Living Limited | Health & social care | 2023 |
| BTM Histopathology Limited | Health & social care | 2025 |
| BTS Facades Ltd | Construction | 2022 |
| Bubbles Pank Limited | Financial services | 2023 |
| Bubbly Stuff Ltd | Hospitality | 2016 |
| Bubstech Ltd | Wholesale & retail | 2025 |
| Bubu Innovations Ltd | Professional & scientific | 2022 |
| Buchan & Co Holdings Limited | Real estate | 2023 |
| Buck Property Co Ltd | Real estate | 2019 |
| Buckden Land Limited | Construction | 2017 |
| Buckie Limited | Construction | 2018 |
| Buckland Property Limited | Construction | 2021 |
| Buckland Services Ltd | Mining & quarrying | 2021 |
| Buckley HR Specialists Limited | Administrative & support | 2026 |
| Buddhadharmasangha Community Interest Company | Other services | 2022 |
| Budease Ltd | Professional & scientific | 2025 |
| Budika Limited | Health & social care | 2018 |
| BUE Ltd | Administrative & support | 2018 |
| Buff Construction Limited | Construction | 2015 |
| Buffalo Coffee Brewers Ltd | Manufacturing | 2023 |
| Buffalo Couriers Ltd | Transport & logistics | 2016 |
| Bugbiome Limited | Professional & scientific | 2021 |
| Bugenbear Property Solutions Ltd | Real estate | 2025 |
| Bugenbear Residential Ltd | Real estate | 2025 |
| Build Agility Strength Ltd | Health & social care | 2023 |
| Build Charity Limited | Health & social care | 2012 |
| Build Norfolk Ltd | Construction | 2024 |
| Build Test Learn Limited | Information & communication | 2014 |
| Buildbuddy Solutions Ltd | Construction | 2024 |
| Buildelite Developments Ltd | Construction | 2017 |
| Builders Equipment (Norwich) Limited | Professional & scientific | 1996 |
| Builders Equipment Limited | Wholesale & retail | 1959 |
| Builders of Tomorrow CIC | Education | 2024 |
| Building & Joinery Services Northeast Ltd | Construction | 2017 |
| Building & Maintenance Norfolk Ltd | Construction | 2014 |
| Building Blocks Investments Limited | Real estate | 2021 |
| Building Partnerships Limited | Construction | 1999 |
| Building Plans Limited | Professional & scientific | 2002 |
| Building Services (Easton) Limited | Construction | 1961 |
| Building Solutions Norfolk Ltd | Construction | 2025 |
| Buildmoores Limited | Construction | 2013 |
| Buildtex Holdings Ltd | Financial services | 2022 |
| Buildx Builders Ltd | Construction | 2024 |
| Buildx Lettings Ltd | Real estate | 2025 |
| Built by Harry Construction Ltd | Manufacturing | 2025 |
| Built by Harry Ltd | Construction | 2024 |
| Buka Street Limited | Hospitality | 2024 |