| Brainweb Ltd | Professional & scientific | 2016 |
| Bramble and Vine Limited | Manufacturing | 2026 |
| Bramble Homecare Limited | Health & social care | 2010 |
| Bramble House Ltd | Wholesale & retail | 2019 |
| Bramble Lane Property Ltd | Real estate | 2025 |
| Bramble Lodge Alpaca's Ltd | Wholesale & retail | 2022 |
| Bramble Lodge Management Company Limited | Households | 2004 |
| Brambleberry Consulting Limited | Professional & scientific | 2024 |
| Bramblehatch Limited | Professional & scientific | 2012 |
| Brambleside Limited | Construction | 2008 |
| Bramley Lane (Griston) Management Company Limited | Extraterritorial | 2018 |
| Brancaster House Financial Planning Ltd | Financial services | 2020 |
| Brancaster House Group Ltd | Financial services | 2020 |
| Brancaster House Ltd | Administrative & support | 2004 |
| Brancaster Property Holdings Ltd | Financial services | 2020 |
| Brancaster Trading Holdings Ltd | Financial services | 2020 |
| Branch & Flow Ltd | Wholesale & retail | 2026 |
| Branch Newholdco Limited | Financial services | 2025 |
| Branch NEWHOLDCO2 Limited | Financial services | 2025 |
| Brand (Motor) Engineers Limited | Wholesale & retail | 1948 |
| Brand Building Consultancy Limited | Professional & scientific | 2022 |
| Brand Clever Ltd | Professional & scientific | 2012 |
| Brand Connection Ltd | Wholesale & retail | 2018 |
| Brand Medical Enterprise Limited | Health & social care | 2015 |
| Brand Strategy Partners Limited | Professional & scientific | 2015 |
| Brand Universe Limited | Professional & scientific | 2015 |
| Brandbank Limited | Information & communication | 1998 |
| Brandemic Packaging Ltd | Wholesale & retail | 2026 |
| Brandex (Europe) Limited | Financial services | 1995 |
| Brandex Advisory Limited | Administrative & support | 2018 |
| Brandex Digital Ltd | Information & communication | 2010 |
| Brandex Financial Limited | Financial services | 2014 |
| Brandex Group Holdings Limited | Administrative & support | 2017 |
| Brandex Media Europe Limited | Professional & scientific | 2019 |
| Brandlord Ltd | Real estate | 2021 |
| Branford Road Limited | Real estate | 2020 |
| Branksome Homes (EA) Limited | Real estate | 2019 |
| Branksome Independent Consulting Limited | Financial services | 2020 |
| Branksome Property Company Ltd | Administrative & support | 2015 |
| Bransford Lakes Ltd | Real estate | 2022 |
| Branston Design House Ltd | Professional & scientific | 2020 |
| Brasteds Limited | Hospitality | 1986 |
| Brasteds TWENTY20 Limited | Hospitality | 2020 |
| Brat Chef Ltd | Hospitality | 2025 |
| Bratton Transport Solutions Ltd | Transport & logistics | 2019 |
| Brave Allstars Competition Teams Norwich Limited | Arts & recreation | 2018 |
| Brave Allstars Limited | Arts & recreation | 2016 |
| Bravic Ltd | Manufacturing | 2024 |
| Bravo French Investment & Wealth Limited | Financial services | 2013 |
| Braydescroft Properties Ltd | Real estate | 2011 |
| Braydeston Beef Limited | Agriculture & fishing | 2014 |
| Braydeston Ltd | Manufacturing | 2025 |
| Braydestone Farms Limited | Agriculture & fishing | 1962 |
| Brays Supermarket Limited | Wholesale & retail | 2019 |
| Brazen Plain (Norwich) Management Company Limited | Households | 2013 |
| BRC Roofing Ltd | Construction | 2021 |
| Breachline Labs Limited | Information & communication | 2026 |
| Bread Hospitality Ltd | Administrative & support | 2021 |
| Break | Health & social care | 1983 |
| Break Trading Company Limited | Extraterritorial | 1977 |
| Breakerlink Limited | Professional & scientific | 2004 |
| Breakfree Retail Ltd | Wholesale & retail | 2018 |
| Breakout Software Limited | Information & communication | 2020 |
| Breakthrough in Education Ltd | Administrative & support | 2018 |
| Breakthrough in Property Ltd | Real estate | 2025 |
| Breakthrough in Therapies Ltd | Health & social care | 2026 |
| Breakwater IT Limited | Information & communication | 2005 |
| Breas-E Limited | Manufacturing | 2022 |
| Breastfeeding Support Norwich & Norfolk C.I.C. | Health & social care | 2025 |
| Breathe With Delphine Ltd | Health & social care | 2024 |
| Breckland Fabrications Limited | Manufacturing | 2013 |
| Breckland Farmers Wildlife Network Limited | Agriculture & fishing | 2021 |
| Breckland Growers Limited | Agriculture & fishing | 1996 |
| Breckland Land Rover Club Limited | Arts & recreation | 1985 |
| Breckland Lasers Limited | Manufacturing | 2008 |
| Breckland Paving Limited | Administrative & support | 2022 |
| Breckland Plant Hire Limited | Administrative & support | 2024 |
| Breckland Precision Engineering Limited | Professional & scientific | 2002 |
| Breckland Properties Limited | Real estate | 2023 |
| Breckland Property Holdings Ltd | Real estate | 2024 |
| Breckland Roofing Limited | Construction | 2011 |
| Bred Thorough Ltd | Wholesale & retail | 2018 |
| Breda Spillane Ltd | Professional & scientific | 2017 |
| Brendan Rallison Ltd | Administrative & support | 2002 |
| Brennan International Ltd | Information & communication | 2024 |
| Brent Land Investments Limited | Real estate | 1996 |
| Bretail Limited | Agriculture & fishing | 2013 |
| Brett Private Wealth Limited | Professional & scientific | 2025 |
| Bretton Estates Limited | Real estate | 1999 |
| Brew Catering Limited | Hospitality | 2024 |
| Brew Moves Limited | Transport & logistics | 2025 |
| Brew Yard Estate Ltd | Real estate | 2023 |
| Brewsters Court RTM Company Limited | Professional & scientific | 2011 |
| Breydons Solicitors Limited | Professional & scientific | 2011 |
| BRF Contracts Ltd | Construction | 2012 |
| Brian Durrant & SON Limited | Construction | 2003 |
| Brian Thompson Agricultural Contractors Limited | Agriculture & fishing | 2014 |
| Brian Ward Limited | Wholesale & retail | 2006 |
| Brice Autos Limited | Wholesale & retail | 2017 |
| Bricewold Holdings Limited | Real estate | 2025 |