| B Beales Developers Ltd | Construction | 2018 |
| B Brooks (Property Development) Limited | Construction | 1998 |
| B C Hoskins Electrical Services Limited | Construction | 2003 |
| B D & H Limited | Manufacturing | 1997 |
| B First Care Ltd | Health & social care | 2023 |
| B H Property Finance Limited | Financial services | 2025 |
| B H R (Lime Tree Studios) Limited | Professional & scientific | 1989 |
| B Hair Style Ltd | Other services | 2023 |
| B J Jones Consulting Limited | Professional & scientific | 2009 |
| B Kitch Limited | Hospitality | 2019 |
| B L C Builders Limited | Construction | 2002 |
| B Murray Developers Limited | Construction | 2004 |
| B R Khatun Ltd | Hospitality | 2016 |
| B S L Cards Limited | Wholesale & retail | 2023 |
| B W Carpentry & Building Ltd | Manufacturing | 2025 |
| B W Property Care Limited | Construction | 2021 |
| B Wise Invest Ltd | Administrative & support | 2025 |
| B&B Properties (Norwich) Ltd | Real estate | 2016 |
| B&L Leisure Group Limited | Wholesale & retail | 2023 |
| B&L Partnership Limited | Real estate | 2016 |
| B&M Investments NFK Ltd | Real estate | 2022 |
| B&O Global Holdings Limited | Professional & scientific | 2019 |
| B-Squared Estates Limited | Real estate | 2023 |
| B. a. Crisp Properties Limited | Real estate | 2015 |
| B. MEE Limited | Professional & scientific | 2012 |
| B. Wheeler (UK) Limited | Construction | 2003 |
| B.A. Developments Limited | Construction | 2004 |
| B.A.K.E Together CIC | Health & social care | 2024 |
| B.A.S Accounting Limited | Professional & scientific | 2026 |
| B.H. Hayes & Sons Limited | Construction | 2003 |
| B.I.E Solutions Limited | Construction | 2021 |
| B.J. Beevor Limited | Agriculture & fishing | 2002 |
| B.J.Dennis & SON Ltd | Construction | 2023 |
| B.J.S. Services Limited | Real estate | 1995 |
| B.K. Property Letting Limited | Real estate | 1997 |
| B.M.C. Car Service Group Ltd | Wholesale & retail | 2026 |
| B.M.C.Car Sales Group Ltd. | Wholesale & retail | 2020 |
| B.M.C.Group Bodyworks Ltd | Wholesale & retail | 2025 |
| B.S. Mindham & SON Ltd | Construction | 2003 |
| B.S.O Engineering Ltd | Professional & scientific | 2016 |
| B.S.W. Roofing Limited | Construction | 2016 |
| B.W. Refrigeration and Air Conditioning Limited | Other services | 2001 |
| B.Z.Brothers Groundwork and Brickwork Limited | Construction | 2016 |
| B1SERVICES Limited | Information & communication | 2000 |
| B2016 Ltd | Financial services | 2016 |
| B2E Media Limited | Information & communication | 2019 |
| B32 Ltd | Arts & recreation | 2022 |
| B4 Investments Limited | Real estate | 2017 |
| BA Facilities Management Limited | Professional & scientific | 2019 |
| BAB Electrical Services Limited | Construction | 2011 |
| Baba Homes(Uk) Ltd | Real estate | 2012 |
| Babbitt & Babbitt Limited | Information & communication | 2026 |
| Babergh Growth Ltd | Construction | 2019 |
| Baby Bean Coffee Norwich Limited | Hospitality | 2026 |
| Babylon Limited | Hospitality | 2025 |
| BAC Property Management Ltd | Real estate | 2025 |
| Bace Foods Limited | Manufacturing | 2017 |
| Back 2 Back Online Limited | Wholesale & retail | 2017 |
| Back Alley Dive Ltd | Hospitality | 2021 |
| Back in Motion (Franchising) Limited | Administrative & support | 2009 |
| Back to Basics Bushcrafters CIC | Education | 2016 |
| Back to Basics Training Services Ltd. | Education | 2024 |
| Back to Black Bookkeeping Ltd. | Professional & scientific | 2015 |
| Back to Your Place Limited | Extraterritorial | 2013 |
| BACK2STRENGTH Chiropractic Ltd | Health & social care | 2007 |
| Backhouse Consultancy Limited | Professional & scientific | 2006 |
| Bacom Engineering Limited | Professional & scientific | 2010 |
| Bacom Engineering Services Ltd | Professional & scientific | 2023 |
| Bacon Holdings Limited | Financial services | 2024 |
| Bacon Property Group Ltd | Real estate | 2021 |
| Bacterial International Group Limited | Water & waste | 2022 |
| Bada Bing Entertainment Limited | Information & communication | 2014 |
| Bada Bing Group Limited | Financial services | 2026 |
| Badawy Medical Ltd | Health & social care | 2024 |
| Badayeta Care Ltd | Health & social care | 2016 |
| Badcat AV Solutions Limited | Administrative & support | 2019 |
| Baden Holdings Ltd | Real estate | 2022 |
| Badersfield Convenience Store Limited | Wholesale & retail | 2014 |
| Badger Consultants Ltd | Other services | 2017 |
| Baela Ltd | Real estate | 2022 |
| Baela Sales Ltd | Real estate | 2025 |
| Bag-N-Agg Limited | Mining & quarrying | 2015 |
| Baganlan Limited | Health & social care | 2024 |
| Bagel Blinders Ltd | Hospitality | 2024 |
| Baggleys Machinery Limited | Manufacturing | 2023 |
| Bagpop Ltd | Professional & scientific | 2021 |
| Bags of Peace Limited | Professional & scientific | 2024 |
| Bagshaw Property Limited | Real estate | 2011 |
| Bagwell Consulting Limited | Professional & scientific | 2015 |
| Bahay Rentals Ltd | Real estate | 2021 |
| Bail Holdings Ltd | Professional & scientific | 2024 |
| Bailey Bird & Warren Limited | Real estate | 2015 |
| Bailey Grove Partners Ltd | Financial services | 2024 |
| Bailey MAY Limited | Arts & recreation | 2025 |
| Bailey's Flooring Ltd | Construction | 2018 |
| Bailey, Booth and Massingham Ltd | Health & social care | 2017 |
| Baileybailey Limited | Real estate | 2021 |
| Baileys Builders Ltd | Construction | 2026 |
| Bailiwick IT Ltd | Information & communication | 2010 |
| Bainbridge Events Ltd | Hospitality | 2025 |