| Behaviour Analytica Ltd | Professional & scientific | 2018 |
| Belle ILE Limited | Real estate | 2021 |
| Bellmere Boilers Ltd | Construction | 2017 |
| Bells Beauties Limited | Other services | 2022 |
| Benchmark FF & E Solutions Limited | Manufacturing | 2015 |
| Benji's Signature Homes Ltd | Construction | 2026 |
| Bennington Plant Ltd | Administrative & support | 2015 |
| Bens Blasting Ltd | Construction | 2024 |
| Berg ALM Limited | Transport & logistics | 2019 |
| Bespoke Crete Ltd | Manufacturing | 2020 |
| Bespoke Real Estate Ltd | Real estate | 2022 |
| Better Stock Clearance Ltd | Wholesale & retail | 2022 |
| Betterxpress Ltd | Wholesale & retail | 2018 |
| Betty Brandworks Ltd | Professional & scientific | 2026 |
| Beukes Integration & Control Ltd | Professional & scientific | 2014 |
| BFG Systems Limited | Professional & scientific | 2022 |
| BG Distro Ltd | Wholesale & retail | 2026 |
| Bgtm Ltd | Public administration | 2019 |
| Bibbey Contractor Services Ltd | Professional & scientific | 2023 |
| Biedronka Supermarket Ltd | Wholesale & retail | 2021 |
| Biedronka Thetford Ltd | Wholesale & retail | 2026 |
| Biocam Technologies Ltd | Information & communication | 2025 |
| Biosa Limited | Health & social care | 2003 |
| Biove Ltd | Wholesale & retail | 2024 |
| Birch Tools Ltd | Wholesale & retail | 2020 |
| BJD Watton Limited | Hospitality | 2024 |
| Bkls Medical & Training Services Ltd | Health & social care | 2011 |
| BKR Plant Ltd | Manufacturing | 2013 |
| Black Agricultural Contracting Limited | Agriculture & fishing | 1995 |
| Black Dog Off-Road Ltd | Wholesale & retail | 2015 |
| Black Horse PUB (Thetford) Ltd | Hospitality | 2016 |
| Black Raven Games Limited | Wholesale & retail | 2026 |
| Blackdyke Trout FLY Fishery Limited | Agriculture & fishing | 2016 |
| Blake and Boughton Limited | Manufacturing | 2001 |
| Blakeney Park Farms LLP | | 2013 |
| Blenheim House Holding Company Ltd | Financial services | 2021 |
| Blessed BE Alterations Ltd | Professional & scientific | 2024 |
| Blinks Trading Limited | Wholesale & retail | 2024 |
| Blooming Blends Ltd | Manufacturing | 2018 |
| Bloomlynn Limited | | 1978 |
| Blossom Style & Solaris Ltd | Wholesale & retail | 2023 |
| Blue Chilli Technology Limited | Information & communication | 2007 |
| Blue Oak Developments Limited | Construction | 1999 |
| Blue Oak Properties Limited | Construction | 1999 |
| Blue Swift Property Ltd | Construction | 2019 |
| Blue Tech Detection Limited | Wholesale & retail | 2024 |
| Bluebell Electrical Ltd | Construction | 2021 |
| Bomfire Ltd | Administrative & support | 2017 |
| Bonben Ltd | Health & social care | 2025 |
| Boniface Engineering Limited | Manufacturing | 1987 |
| Bowes Farms Limited | Agriculture & fishing | 2008 |
| BR2 Investments Ltd | Real estate | 2023 |
| Braddick Installations Limited | Construction | 2017 |
| Bradenham Hall Limited | Agriculture & fishing | 2010 |
| Bradley Property Holdings Limited | Real estate | 2023 |
| Brandon 1964 Limited | Extraterritorial | 2014 |
| Brandon Bolt Company Limited | Wholesale & retail | 2009 |
| Brandon Motor Rentals Ltd | Administrative & support | 2008 |
| Bravo 2 Zero Ltd | Wholesale & retail | 2023 |
| Breckland Accountancy Limited | Professional & scientific | 2014 |
| Breckland ALL Sports Enterprise Community Interest Company | Arts & recreation | 2026 |
| Breckland Geomatics Limited | Professional & scientific | 2013 |
| Breckland Heating Limited | Construction | 2011 |
| Breckland Hygiene & Mobility Limited | Professional & scientific | 2013 |
| Breckland Mechanical Installations Ltd | Construction | 2013 |
| Breckland Sporting Club Ltd | Arts & recreation | 2026 |
| Breckland Surgeries Limited | Health & social care | 2019 |
| Brett Tilly Flooring Limited | Construction | 2017 |
| Bridon I.T. Support Ltd. | Information & communication | 2001 |
| Britannia Assets Ltd | Real estate | 2019 |
| Brix Homes Limited | Real estate | 2025 |
| Brook Chauffeur Services Ltd | Transport & logistics | 2017 |
| Brown UK Investment Ltd | Real estate | 2024 |
| Bruce Bramfield Limited | Wholesale & retail | 2020 |
| Bryco Recruitment Limited | Administrative & support | 2020 |
| Bssb Norfolk Limited | Wholesale & retail | 2026 |
| BTO Consulting Ltd | Professional & scientific | 2019 |
| BTO Electrics Ltd | Construction | 2017 |
| BTO Services Limited | Wholesale & retail | 1994 |
| BTS Roadshow Limited | Arts & recreation | 2024 |
| BTX Holdings Ltd | Transport & logistics | 2021 |
| BTX Stock Clearance Ltd | Wholesale & retail | 2022 |
| Building Control Compliance Testing Limited | Professional & scientific | 2023 |
| Building Madness Limited | Wholesale & retail | 2022 |
| Bulrush (Norfolk) Ltd | Manufacturing | 2019 |
| Burnstowe Investment Management LLP | | 2018 |
| Buryford Developments Limited | Construction | 2026 |
| Buryford Homes Limited | Construction | 2024 |
| Bush Adventures UK C.I.C. | Education | 2019 |
| Business Holistics Limited | Professional & scientific | 2014 |
| Buy ME Like ME Limited | Information & communication | 2016 |
| BWM Consulting Limited | Professional & scientific | 2012 |
| Byhookorbycrooktouring Ltd | Arts & recreation | 2025 |
| Byrne Construction Services Ltd | Professional & scientific | 2019 |
| C & D Foods (Larkshall) Unlimited | Manufacturing | 1999 |
| C & G Property Solutions Ltd | Real estate | 2021 |
| C Ball Limited | Transport & logistics | 2024 |
| C J Wortley & SON Ltd | Wholesale & retail | 2013 |
| C&A Scrimshaw Property Developments Ltd | Construction | 2025 |
| C&L Services EST 2022 Ltd | Hospitality | 2023 |