| Blyth Park Management Ltd | Households | 2016 |
| Blyth Park Residents Company Ltd | Administrative & support | 2018 |
| Blythview Management Company Limited | Households | 2000 |
| BM 2016-1 Limited | Wholesale & retail | 1994 |
| BM Houses Ltd | Real estate | 2021 |
| BM Snacks Limited | Wholesale & retail | 2008 |
| BMA Construction Group Ltd | Construction | 2017 |
| BMA Specialist Coatings Limited | Construction | 2009 |
| BMB Heating & Plumbing Ltd | Construction | 2023 |
| BMC East Limited | Construction | 2000 |
| BMD Homes Ltd | Real estate | 2022 |
| BME Youth | Education | 2015 |
| BMG Technology Ltd | Information & communication | 2009 |
| BMK Electrical Ltd | Construction | 2021 |
| BMP Plumbing and Bathroom Specialist Ltd | Construction | 2023 |
| BMR Agricultural Contractors Ltd | Agriculture & fishing | 2014 |
| BMS Solutions Holdings Limited | Financial services | 2022 |
| BN8 Business Academy Ltd | Professional & scientific | 2026 |
| BNL Health Care Limited | Health & social care | 2016 |
| Bo-Tanical Norwich Ltd | Wholesale & retail | 2018 |
| Boaca Ltd | Hospitality | 2015 |
| Boal Associates Ltd | Professional & scientific | 2011 |
| Board Originator Ltd. | Information & communication | 2020 |
| BOB Parsons Associates Limited | Other services | 2023 |
| Bobacus Limited | Wholesale & retail | 2025 |
| Bobbins Way Management Limited | Extraterritorial | 2013 |
| Bobby Trans & Taxi Service Ltd | Transport & logistics | 2023 |
| Boblu Limited | Wholesale & retail | 2021 |
| Bobolink Services Limited | Construction | 2019 |
| Bodega Catering Ltd | Hospitality | 2024 |
| Bodmin Court Residents Association Limited | Households | 2003 |
| Body and Style Media Limited | Other services | 2022 |
| Body Matters Beauty Clinic Limited | Health & social care | 2024 |
| Body Tingle Ltd | Other services | 2024 |
| Bodyworks (Norwich) Limited | Other services | 2003 |
| BOE Information Systems Limited | Information & communication | 1996 |
| Boffintopia Ltd | Professional & scientific | 2024 |
| Boghopper Races Ltd | Arts & recreation | 2022 |
| Boho Interactive Ltd | Information & communication | 2026 |
| Boiler Champ Ltd | Construction | 2022 |
| Boiler Recycle Direct Ltd | Wholesale & retail | 2018 |
| Boiler Replacement Services Limited | Construction | 2004 |
| Bokbok Creative Ltd | Administrative & support | 2023 |
| Bokk Limited | Health & social care | 2018 |
| Bolay Limited | Health & social care | 2022 |
| Bold Creatures Ltd | Administrative & support | 2024 |
| Bold Directories Limited | Administrative & support | 2007 |
| Bold Health Limited | Health & social care | 2018 |
| Boldcircuit Limited | Information & communication | 1988 |
| Bolddog Limited | Wholesale & retail | 2002 |
| Boldmoor Limited | Real estate | 2021 |
| Boleskine Ltd | Construction | 2018 |
| Boleyn Ventilation Services Ltd | Construction | 2025 |
| Bolly Baggins Ltd | Arts & recreation | 2024 |
| Bollywood Tadka Ltd | Wholesale & retail | 2013 |
| Bolster Limited | Wholesale & retail | 2006 |
| Bombai Spice Ltd | Hospitality | 2020 |
| Bombay Palace (Worcester) Limited | Hospitality | 2013 |
| BON Bakery Ltd | Hospitality | 2019 |
| BON Temp Limited | Hospitality | 2024 |
| Bonams Ltd | Real estate | 2019 |
| Bonblarke Resources Ltd | Professional & scientific | 2022 |
| Bond & SON Taxis Ltd | Transport & logistics | 2021 |
| Bond and Gowing Limited | Hospitality | 2001 |
| Bond Hygiene Ltd | Health & social care | 2025 |
| Bond Street Cafe Norwich Ltd | Hospitality | 2024 |
| Bondford Ltd | Information & communication | 2018 |
| Bondi Holdings Ltd | Information & communication | 2022 |
| Bondons Moorings Ltd | Transport & logistics | 2023 |
| Bonds Taxi's Ltd | Transport & logistics | 2002 |
| Bones Alone Limited | Health & social care | 2010 |
| Bones Garage Limited | Wholesale & retail | 2016 |
| Bonheur Courier Ltd | Transport & logistics | 2024 |
| Bonifaas Ltd | Health & social care | 2020 |
| Bonje Limited | Financial services | 2024 |
| Bonneville Book-Keeping & Accountancy Ltd | Professional & scientific | 2016 |
| Bonnie Baby Limited | Manufacturing | 2004 |
| Bonnyrigg House Limited | Construction | 2024 |
| Bons and Frazer Ltd | Professional & scientific | 2026 |
| Booco Limited | Real estate | 2026 |
| Bookbugs & Dragon Tales Ltd | Wholesale & retail | 2020 |
| Booking Childcare Ltd | Health & social care | 2021 |
| Bookkeepher Ltd | Professional & scientific | 2025 |
| Bookkeeping 121 Ltd | Professional & scientific | 2022 |
| Boomer Holdings Limited | Financial services | 2024 |
| Boon Global Limited | Information & communication | 2024 |
| Boone App Ltd | Information & communication | 2024 |
| Boone Consultancy Ltd | Professional & scientific | 2020 |
| Boothby Wildland Limited | Agriculture & fishing | 2021 |
| Bootman Chemical Safety Limited | Administrative & support | 1993 |
| Bordeaux Couture Limited | Wholesale & retail | 2019 |
| Border Collie & Working Sheepdog Fitting Database UK CIC | Other services | 2025 |
| Bored Incorporations Ltd | Financial services | 2021 |
| Borehole Surveys Limited | Construction | 2015 |
| Borg & Overstrom Holding Limited | Financial services | 2026 |
| Borg & Overstrom Limited | Other services | 2026 |
| Borisyonka Ltd | Transport & logistics | 2018 |
| Born to RUM Ltd | Manufacturing | 2024 |
| Borne Media Ltd | Administrative & support | 2014 |
| Borough Workwear Ltd | Wholesale & retail | 2019 |