| B J Hurn Limited | Financial services | 2025 |
| B P Clinic Limited | Health & social care | 2003 |
| B W Langley & SON Ltd | Agriculture & fishing | 2015 |
| B. R. Motor Repairs Ltd | Wholesale & retail | 2013 |
| B. S. a. Mouldings Limited | Manufacturing | 1990 |
| B.R.Bird Construction Ltd | Construction | 2019 |
| B16 Ltd | Construction | 2015 |
| Babsomikay Limited | Health & social care | 2026 |
| Back on Track Healey Ltd | Other services | 2012 |
| Backchannel Limited | Administrative & support | 2003 |
| Backyard PIT Rubs Ltd | Wholesale & retail | 2026 |
| Bacocompak (Norfolk) Limited | Other services | 1970 |
| Bacon Electrical Services Limited | Construction | 2025 |
| BAF Courier Limited | Transport & logistics | 2024 |
| Bahia Blanca Developments Limited | Real estate | 2006 |
| Bahia Blanca Leisure Limited | Hospitality | 1998 |
| Bahia Blanca Management Limited | Hospitality | 2017 |
| Bailey Automotives Ltd | Wholesale & retail | 2020 |
| Bailey Electrical Limited | Construction | 2002 |
| Bakamo Limited | Professional & scientific | 2016 |
| Bake & Blend Ltd | Hospitality | 2025 |
| Balloonprint Limited | Manufacturing | 2007 |
| Balmforths Ltd | Real estate | 2002 |
| Bampnigwe Holding Company Ltd. | Financial services | 2019 |
| Bank Farm Limited | Agriculture & fishing | 1944 |
| Bank House Hotel Limited | Hospitality | 2007 |
| Bannister DYE Accountants Limited | Professional & scientific | 2025 |
| Banya & SON Carpentry Ltd | Construction | 2024 |
| Banyi’S Kitchen & Grills Ltd | Manufacturing | 2025 |
| Bar 21 Hunstanton Ltd | Hospitality | 2025 |
| Bar Electrical & Home Improvements Limited | Construction | 2026 |
| Barcelona International One Loft Race Ltd | Agriculture & fishing | 2020 |
| Barefoot Crew Ltd | Education | 2023 |
| Bark Side of the Moon Ltd | Other services | 2023 |
| Barkers Internet Limited | Information & communication | 2019 |
| Barmer Hall Farm Limited | Hospitality | 1958 |
| Barnes Home Developments Ltd | Construction | 2023 |
| Barry Davidson Associates Ltd | Professional & scientific | 2005 |
| Barrys Cars & Commercials Ltd | Wholesale & retail | 2011 |
| Barrys Cars & Minibuses Ltd | Transport & logistics | 2011 |
| Barsby Produce Limited | Wholesale & retail | 2011 |
| Bart Trans Ltd | Transport & logistics | 2024 |
| Barton & Porter Ltd | Real estate | 2024 |
| Barton Bendish Farming Limited | Agriculture & fishing | 2007 |
| Baryon Ltd | Administrative & support | 2006 |
| Baseline Hospitality Ltd | Professional & scientific | 2026 |
| Basilea Group Ltd | Real estate | 2025 |
| Bastone Major Group Ltd | Wholesale & retail | 2026 |
| Bathco EU Ltd. | Extraterritorial | 2012 |
| Bawsey Limited | Real estate | 2019 |
| Bayern Construction & Maintenance Ltd | Construction | 2024 |
| BB Party Tents Ltd | Hospitality | 2026 |
| BB Strategies Ltd | Wholesale & retail | 2025 |
| BBP Medical Ltd | Health & social care | 2022 |
| BBS Properties (Norfolk) Ltd | Construction | 2024 |
| BC Creative Productions Ltd | Information & communication | 2022 |
| BD Scaffolding Services Ltd | Construction | 2019 |
| BE Amazed Limited | Professional & scientific | 2014 |
| Beaches & Broads Chalets Ltd | Hospitality | 2022 |
| Beacon Risk Management Ltd | Professional & scientific | 2009 |
| Bearmont Trading Co Ltd | Wholesale & retail | 2020 |
| Beau and Bean Ltd | Wholesale & retail | 2025 |
| Beau-Rose Limited | Professional & scientific | 2010 |
| Beauty Aesthetics Ltd | Other services | 2024 |
| Beauty Botanic Limited | Other services | 2020 |
| Beauty Refined Limited | Health & social care | 2025 |
| Bedcare Holdings Limited | Real estate | 2019 |
| Bedcare Ltd | Wholesale & retail | 2015 |
| BEE Scaffolding Limited | Construction | 2022 |
| Beefy's Livestock Limited | Agriculture & fishing | 2024 |
| Beeken Limited | Construction | 2017 |
| Beeline Refrigeration EOT Limited | Administrative & support | 2022 |
| Beeston Auction House Ltd | Wholesale & retail | 2019 |
| Beigi Investment Limited | Real estate | 2012 |
| Beijing Express 23 Limited | Hospitality | 2023 |
| Belfast Linen Holdings Limited | Real estate | 1995 |
| Bell Close Residents Management Company Limited | Households | 2018 |
| Bell FG Limited | Financial services | 2020 |
| Bellamy, Steele & Co Ltd | Professional & scientific | 2008 |
| Bellfosters Management Company Limited | Households | 1987 |
| Belmont Precision Engineering Company Limited | Professional & scientific | 1990 |
| Below the Surface Official Ltd | Other services | 2026 |
| Belton & Duffey West Norfolk Limited | Real estate | 2008 |
| Belton and Duffey International Ltd | Real estate | 2026 |
| Belton Duffey International Ltd | Real estate | 2026 |
| Belu Consult Project Ltd | Construction | 2025 |
| Belwood Design & Build Limited | Construction | 2019 |
| Bemar Developments Ltd | Real estate | 2019 |
| BEN Brooke Digital Limited | Administrative & support | 2018 |
| BEN Camp Properties Limited | Real estate | 2023 |
| BEN Nails & Beauty Ltd | Other services | 2026 |
| Benchmark Building and Roofing Ltd | Construction | 2014 |
| Benefer Architectural Ltd | Professional & scientific | 2012 |
| Benefer Builders Ltd | Construction | 2012 |
| Beneve Limited | Professional & scientific | 2017 |
| Benjamin Electric Ltd | Manufacturing | 2020 |
| Benjamin Major Design Limited | Professional & scientific | 2019 |
| Bennet Transport Ltd | Transport & logistics | 2020 |
| Bennett and Co Estate Agents Ltd | Professional & scientific | 2018 |
| Bennett P Limited | Wholesale & retail | 2018 |