| Balderton Village Day Nursery Limited | Health & social care | 2006 |
| Ballard Fort Limited | Construction | 1996 |
| Bands Capital II Ltd | Hospitality | 2015 |
| Bands Capital III Ltd | Real estate | 2015 |
| Bang in Cromer Limited | Hospitality | 2021 |
| Bang in Fakenham Limited | Hospitality | 2021 |
| Bang in Holt Limited | Hospitality | 2021 |
| Bang in Limited | Hospitality | 2023 |
| Bang in Norwich Limited | Hospitality | 2021 |
| Bang in Sheringham Limited | Hospitality | 2021 |
| Bang in Wells (One) Limited | Hospitality | 2020 |
| Bangkok Express Foodie Ltd | Hospitality | 2024 |
| Barbara MAY Foundation UK | Health & social care | 2010 |
| Bargate Solutions Limited | Professional & scientific | 2012 |
| Baristae Ltd | Hospitality | 2025 |
| Barker Building Services Ltd | Construction | 2025 |
| Barker Maule Limited | Financial services | 2009 |
| Barker Maule Wealth Management Limited | Financial services | 2024 |
| Barlings Limited | Extraterritorial | 1997 |
| Barn Property Services Ltd | Households | 2025 |
| Barnard Construction (Besthorpe) Limited | Construction | 2008 |
| Barnard Construction and Developments Ltd | Construction | 2022 |
| Barnard Homes Limited | Construction | 2014 |
| Barnby Crossing Management Company Limited | Professional & scientific | 2006 |
| Barnby House Management Company Ltd | Real estate | 2014 |
| Barrowclift House Ltd | Construction | 2025 |
| Barwell Homes Limited | Real estate | 2019 |
| Barwell Motors Limited | Wholesale & retail | 2011 |
| Basiq Ltd | Wholesale & retail | 2025 |
| Bates House & Garden Maintenance Ltd | Other services | 2023 |
| Battleguide Services Ltd | Wholesale & retail | 2012 |
| Baukus Services Ltd | Construction | 2026 |
| Bayou Bluenvironment Limited | Professional & scientific | 2011 |
| Baytree Furniture Limited | Manufacturing | 2017 |
| BBR Technology Limited | Information & communication | 2023 |
| BCA Technical Ltd | Professional & scientific | 2025 |
| BD Site Service Limited | Construction | 2009 |
| BDB Ventures Limited | Professional & scientific | 2010 |
| BE Boda Ltd | Wholesale & retail | 2024 |
| BE Hird Counselling CIC | Health & social care | 2026 |
| Beacon Fencing Newark Ltd | Manufacturing | 2021 |
| Beacon Plumbing Services Limited | Construction | 2024 |
| Beacon Travel Group Ltd | Administrative & support | 2025 |
| Bear Appliances Limited | Wholesale & retail | 2008 |
| Bear Automotive Ltd | Wholesale & retail | 2025 |
| Beaurepaire Property Limited | Households | 2021 |
| Beauty & the Brow Ltd | Other services | 2005 |
| Beck Wind Holdings Limited | Financial services | 2013 |
| Beckett Electrical Contractors Ltd | Construction | 2018 |
| Beckett Property Holdings Limited | Real estate | 2024 |
| BEE Company (UK) Ltd | Administrative & support | 2016 |
| BEE Home Property Ltd | Real estate | 2017 |
| Beedham Lettings Ltd | Real estate | 2022 |
| Been There, Done That LLP | | 2012 |
| Being Influential Ltd | Professional & scientific | 2007 |
| Bell Keynes Ltd | Wholesale & retail | 2011 |
| Bellamy Farm Property Management Company Limited | Real estate | 2021 |
| Bellissima Salons Ltd | Other services | 2024 |
| Bells & Whiskers Ltd | Manufacturing | 2021 |
| Belluga GAS Garage Ltd | Wholesale & retail | 2022 |
| Beloli Boutique Limited | Wholesale & retail | 2019 |
| Belvoir Building & Landscaping Ltd | Construction | 2024 |
| Belvoir Development Newark Ltd | Households | 2026 |
| BEN Antcliff Transport Limited | Transport & logistics | 2022 |
| BEN Bradley Associates Ltd | Professional & scientific | 2024 |
| BEN Taylor Ltd | Information & communication | 2014 |
| Benfield L Limited | Wholesale & retail | 2026 |
| Bennett Investment Group Ltd | Information & communication | 2026 |
| Bennington Construction Limited | Construction | 2025 |
| Bennington Finance Limited | Professional & scientific | 2010 |
| Bennington Pet Foods Limited | Manufacturing | 2001 |
| Bennington Steel Construction Ltd | Construction | 2018 |
| Bennington's Poultry Limited | Agriculture & fishing | 1997 |
| Benningtons Ltd | Real estate | 2024 |
| Benoy Limited | Professional & scientific | 1992 |
| Bentley Homes Limited | Hospitality | 2012 |
| Berrie Investments Ltd | Financial services | 2024 |
| Berry & Waddingham Inns Ltd | Hospitality | 2026 |
| Berry Building Services Ltd | Construction | 2023 |
| Berry Creations Ltd | Wholesale & retail | 2019 |
| Bespoke Fit Life Limited | Education | 2020 |
| Bespoke Fit Life Southwell Ltd | Health & social care | 2022 |
| Bespoke Homes and Lettings Limited | Real estate | 2025 |
| Bespoke Sash Windows Ltd | Construction | 2026 |
| Best CUT Newark Limited | Other services | 2021 |
| Best Select Plumbing & Heating Services Ltd | Construction | 2017 |
| Besthorpe Cattle Company Limited | Agriculture & fishing | 1994 |
| Betcom Limited | Information & communication | 2008 |
| Bete Limited | Wholesale & retail | 2000 |
| Beth Shalom Limited | Arts & recreation | 1978 |
| Bethel House CIC | Other services | 2026 |
| Bewitch Marketing Limited | Other services | 2010 |
| Beyond Belief Limited | Arts & recreation | 2016 |
| Beyond Coffee Collingham Limited | Hospitality | 2022 |
| Beyond Coffee Lincoln Limited | Hospitality | 2025 |
| Beyond Coffee UK Limited | Hospitality | 2020 |
| BF Day Groundworks Ltd | Construction | 2023 |
| BFL Investments Ltd | Real estate | 2016 |
| BFS Nationwide Ltd | Manufacturing | 2014 |
| BGS Maintain Limited | Construction | 2021 |