| BEN Van Dyke Towing Limited | Information & communication | 1992 |
| Benite OIL & GAS Services Limited | Mining & quarrying | 2019 |
| Berkeley (Insurance) Holdings Limited | Professional & scientific | 1998 |
| Berkeley (Insurance) Limited | Financial services | 1962 |
| Berkshire Engineering Supplies Limited | Manufacturing | 2001 |
| Bermuda Club Hemsby Ltd | Hospitality | 2026 |
| Bespoke Garden Craft Limited | Administrative & support | 2011 |
| Bespoke Horizon Solutions Limited | Administrative & support | 2023 |
| Best 4 Promotions (Norfolk) Limited | Professional & scientific | 2017 |
| Best Highway's Ltd | Construction | 2024 |
| Better Said Communications Ltd | Professional & scientific | 2026 |
| Bewmarsh Ltd | Professional & scientific | 2020 |
| BG Recruitment Ltd | Other services | 2026 |
| Bg's Diner Limited | Hospitality | 2019 |
| BGC Residents Management Company Limited | Households | 2024 |
| BGW Developments Ltd | Construction | 2015 |
| Bharat Arts UK Ltd | Wholesale & retail | 2019 |
| Bibi Tandoori Ltd | Hospitality | 2026 |
| Bieber Consulting Limited | Professional & scientific | 2011 |
| Bifta Ltd | Information & communication | 2025 |
| Big Nippers Limited | Agriculture & fishing | 2016 |
| Big Screen Co Limited | Wholesale & retail | 2016 |
| Bildeston Bikes Limited | Wholesale & retail | 2024 |
| Billockby Farms Limited | Agriculture & fishing | 1961 |
| Binderka Limited | Hospitality | 2025 |
| Bingo Britain Limited | Extraterritorial | 2002 |
| Binky's Cafe Limited | Hospitality | 2019 |
| Bishop and Young Property Ltd | Real estate | 2022 |
| Bisubro Energy Consultants Ltd | Mining & quarrying | 2024 |
| Biteworks Limited | Health & social care | 2019 |
| Bitzbox Ltd | Wholesale & retail | 2025 |
| BKB Construction Limited | Construction | 2025 |
| BKK Holdings Ltd | Financial services | 2022 |
| Black Cat Crafts Ltd | Wholesale & retail | 2026 |
| Black Plague Tattoo Limited | Other services | 2020 |
| Black Sheep Piercing Limited | Other services | 2005 |
| Blackberry Wind Ltd | Administrative & support | 2025 |
| Blacksmiths Gardens (Thurlton) Management Company Limited | Households | 2018 |
| Bladez N Fadez Ltd | Other services | 2026 |
| Blake & Howes Conservatory Roof Upgrades Ltd | Construction | 2025 |
| Blankers Tackle Ltd | Wholesale & retail | 2026 |
| Blaze Squad Ltd | Other services | 2024 |
| BLB Offshore Services Ltd | Professional & scientific | 2026 |
| Blind Beggar Films Limited | Information & communication | 2001 |
| Bliss Hair and Beauty Lounge Ltd | Other services | 2021 |
| BLISS4 Limited | Real estate | 2024 |
| Block 1 Esplanade Court RTM Company Limited | Households | 2010 |
| Blofield Tennis Club Limited | Arts & recreation | 2014 |
| Bloomfield Carpets & Vinyl's Limited | Construction | 2026 |
| Blooming Artificial Limited | Wholesale & retail | 2001 |
| BLS (EA) Limited | Manufacturing | 2023 |
| Blue Box Self Storage Ltd | Extraterritorial | 2017 |
| Blue Eyes Property Limited | Real estate | 2018 |
| Blue Ocean Fish Limited | Hospitality | 2021 |
| Blue Planet Surveys Limited | Mining & quarrying | 2012 |
| Blue Sky Asset Solutions Ltd | Other services | 2019 |
| Blueprint Workshop Ltd | Information & communication | 2011 |
| Bluesilver Commerce Ltd | Wholesale & retail | 2026 |
| Blvcksquare Limited | Information & communication | 2017 |
| Bmbis Ltd | Hospitality | 2019 |
| BMT Group (GY) Limited | Financial services | 2022 |
| BMT Holdings Limited | Professional & scientific | 2018 |
| BN Grocer Ltd | Wholesale & retail | 2025 |
| BNC Equine Transport Limited | Transport & logistics | 2024 |
| Bobby Dazzlers Cleaning Ltd | Other services | 2006 |
| Bobby Dazzlers Specialist Cleaning Ltd | Administrative & support | 2019 |
| Bonifacio Global Business Solutions Ltd | Information & communication | 2025 |
| Bonus Book Keeping Services Limited | Professional & scientific | 2022 |
| Booee Creative Ltd | Arts & recreation | 2020 |
| Boostgy Limited | Financial services | 2021 |
| Boso (Management) Limited | Real estate | 2008 |
| Boss Barbers Norfolk Ltd | Other services | 2022 |
| Bounce GY Ltd | Arts & recreation | 2022 |
| Bowers & Barr,Limited | Manufacturing | 1909 |
| Boycebrook Management Ltd | Wholesale & retail | 2015 |
| Boyne Business Intelligence Ltd | Information & communication | 2026 |
| Bozkurt TR Ltd | Hospitality | 2025 |
| Bpjc Drilling Solutions Limited | Professional & scientific | 2014 |
| Brads Mobile Barbers Ltd | Other services | 2024 |
| Bradwell Boiler Maintenance Ltd | Construction | 2026 |
| Bradwell Car Repairs Limited | Wholesale & retail | 2018 |
| Bradwell Hand Car Wash Ltd | Other services | 2019 |
| Branch ENG Ltd | Professional & scientific | 2019 |
| Brand Pubs Limited | Hospitality | 2024 |
| Brandscapes Gardens Limited | Administrative & support | 2023 |
| Branford Angling Limited | Wholesale & retail | 2018 |
| Branford's Limited | Hospitality | 2017 |
| Braveface Limited | Health & social care | 2006 |
| Brett Vale Residential Homes Limited | Extraterritorial | 2005 |
| Brew Leisure Limited | Hospitality | 2024 |
| Breydon Centre Limited | Real estate | 2012 |
| Breydon Enterprises Limited | Manufacturing | 1992 |
| Breydon Flooring Ltd | Construction | 2004 |
| Breydon Properties Limited | Real estate | 2012 |
| Brian Newson Developments Limited | Construction | 2000 |
| Bribarbo Limited | Financial services | 2019 |
| Brice Exercise Specialists Ltd | Administrative & support | 2016 |
| Brick Kiln Gardens Management Co. Limited | Households | 2009 |
| Brickfields Dental Care Limited | Health & social care | 2014 |
| Bridge Car Park Company Limited | Real estate | 2010 |