| BCB Transport Ltd | Transport & logistics | 2019 |
| Bcds Services Ltd | Administrative & support | 2016 |
| BE Creative (Global Sourcing) Limited | Administrative & support | 2013 |
| BE Youthful Ltd | Other services | 2024 |
| Bear & Beans Cafe Ltd | Manufacturing | 2025 |
| Bear Necessities Limited | Wholesale & retail | 2025 |
| Beau Maison Kitchens Limited | Construction | 2011 |
| Beaufort Financial Planning (Mansfield) Limited | Administrative & support | 2007 |
| Beauty and Aesthetics by Natalie Ltd | Other services | 2023 |
| Beauty at Home Ltd | Other services | 2019 |
| Beauty Box Mansfield Limited | Other services | 2026 |
| Beauty Expression (UK) Limited | Wholesale & retail | 2013 |
| Beaver Homes (Mansfield) Limited | Construction | 2001 |
| Beaver Homes NO. 1 Limited | Real estate | 2004 |
| Becool Coffee Ltd | Wholesale & retail | 2023 |
| Bedom Ltd | Transport & logistics | 2021 |
| Beech Hill Installations Limited | Construction | 2022 |
| Beechers Court Management Limited | Households | 2024 |
| Beechwood Autos Limited | Wholesale & retail | 2019 |
| Beechwood Developments and Estates Limited | Real estate | 2022 |
| Beehive News (Mansfield) Limited | Wholesale & retail | 2005 |
| Beenoticed Limited | Manufacturing | 2013 |
| Beer and Bird Limited | Construction | 2015 |
| Beer and Bird ST Ives Limited | Hospitality | 2025 |
| Beer Bellies Limited | Wholesale & retail | 2018 |
| Beery Ltd | Health & social care | 2024 |
| Beesmart Services Limited | Administrative & support | 2022 |
| Beespoke Home Sales Ltd | Real estate | 2023 |
| Begum Holdings Limited | Wholesale & retail | 2025 |
| Belfords Construction Ltd | Construction | 2026 |
| Bell Hagg Limited | Extraterritorial | 2019 |
| Bell Transport Group Ltd | Transport & logistics | 2019 |
| Bellamason Properties Ltd | Real estate | 2014 |
| Bellamason Property Investments Ltd | Real estate | 2021 |
| Bellrose Properties Limited | Real estate | 2021 |
| Bells Lake Limited | Households | 2015 |
| Belmont Park Management (Derbyshire) Limited | Real estate | 2008 |
| Belocars Ltd | Wholesale & retail | 2025 |
| Belton Massey Holdings Limited | Extraterritorial | 2019 |
| Belton Massey Limited | Financial services | 2015 |
| BEN and Leah Abbott Limited | Energy | 2019 |
| BEN Catering Ltd | Hospitality | 2018 |
| BEN Elliott Accounting Limited | Professional & scientific | 2003 |
| BEN Maskell Decorators Limited | Construction | 2019 |
| BEN Matthews DJ Ltd | Arts & recreation | 2026 |
| Bend the Stone Ltd | Wholesale & retail | 2016 |
| Benio Property Group Ltd | Construction | 2026 |
| Bennah Properties Limited | Real estate | 2020 |
| Bennetts Accountancy Limited | Professional & scientific | 2002 |
| Bennetts Septic Tanks Limited | Water & waste | 2016 |
| Benz Service Centre Limited | Wholesale & retail | 2010 |
| Berkeley Court (Nottingham) RTM Company Limited | Households | 2009 |
| Bernice Madeke Academy Limited | Education | 2024 |
| Berry Hill Foods Holdings Limited | Financial services | 2026 |
| Berry Hill Foods Limited | Manufacturing | 1988 |
| Berry Hill Grange Management Company Limited | Real estate | 1999 |
| Berry Hill Hall (Mansfield) Management Company Limited | Households | 2006 |
| Besi Autos Limited | Wholesale & retail | 2024 |
| Bespoke Building & Joinery Projects Limited | Construction | 2007 |
| Bespoke by Beechwood Limited | Wholesale & retail | 2023 |
| Bespoke Engineering Fabrications Ltd | Manufacturing | 2018 |
| Bespoke Pension Management (London) LLP | | 2006 |
| Bespoke Pension Management Limited | Financial services | 1999 |
| Bespoke Pet Grooming Ltd | Other services | 2013 |
| Bespoke Shelters Ltd | Manufacturing | 2009 |
| Bespoke Weddings (Central) Limited | Other services | 2016 |
| Bespokeejoiner.Uk Limited | Manufacturing | 2018 |
| Besq Limited | Information & communication | 2008 |
| Best Choice Associate Ltd | Wholesale & retail | 2023 |
| Best FBO Recruitment Ltd | Wholesale & retail | 2026 |
| Best Fit Shutters Ltd | Wholesale & retail | 2024 |
| Best Roar Ltd | Wholesale & retail | 2021 |
| Bett Consulting Limited | Other services | 2013 |
| Better Link Limited | Wholesale & retail | 2024 |
| Between US Clothing Ltd | Wholesale & retail | 2016 |
| BEV Pugh Secretarial Services Limited | Administrative & support | 2015 |
| Bfak Medical Limited | Health & social care | 2025 |
| BFS Accountants Ltd | Professional & scientific | 2010 |
| BGA Limited | Real estate | 2021 |
| Bhairava Property Limited | Real estate | 2019 |
| Bhatia Holdings Ltd | Financial services | 2023 |
| BHF Hire & Services Ltd | Administrative & support | 2022 |
| Biba Legacy Ltd | Professional & scientific | 2026 |
| Bibah Michael Couture Ltd | Manufacturing | 2024 |
| Bickerton Garage Limited | Wholesale & retail | 1982 |
| Bickerton Property Limited | Real estate | 2024 |
| Bidworth Lees Limited | Hospitality | 2021 |
| Big BAT Productions Ltd | Information & communication | 2025 |
| Big Bear Landscaping & Gardening Professionals Ltd | Administrative & support | 2025 |
| Big Cheese Property Limited | Real estate | 2019 |
| Big Hope Property Limited | Real estate | 2024 |
| Big Pear Limited | Wholesale & retail | 2025 |
| Big Sound Marketing Limited | Professional & scientific | 2014 |
| Bikerlink Limited | Information & communication | 2026 |
| Bilko Capital Ltd | Financial services | 2026 |
| Bill Tonks Ventilation Services Ltd | Energy | 2012 |
| Billings Mortgage & Insurance Services Limited | Financial services | 2017 |
| Binch Project Solutions Ltd | Administrative & support | 2012 |
| Binch Racing Ltd | Arts & recreation | 2022 |
| Bindasnewsbooze Limited | Wholesale & retail | 2017 |