| Bespoke Construction & Electrical Ltd | Construction | 2026 |
| Bespoke Home Surveys Ltd | Professional & scientific | 2025 |
| Bespoke LOG Cabin Company Ltd | Construction | 2000 |
| Bespoke Stone Ltd | Wholesale & retail | 2011 |
| Best Badges Limited | Manufacturing | 2002 |
| Best Barbers Ipswich Limited | Other services | 2025 |
| Best Buy&Sale Ltd | Wholesale & retail | 2024 |
| Best Careminds Ltd | Health & social care | 2022 |
| Best Convenience Store Ltd | Wholesale & retail | 2026 |
| Best EDO Ltd | Information & communication | 2022 |
| Best French Camping Ltd | Information & communication | 2026 |
| Best Friend Ltd | Information & communication | 2026 |
| Best OFF Licenece Ltd | Wholesale & retail | 2025 |
| Best People Solutions Ltd | Transport & logistics | 2024 |
| Best Tanning Ltd | Other services | 2014 |
| Best Timber Cabins Ltd | Construction | 2025 |
| Best UK Cleaners Ltd | Administrative & support | 2025 |
| Best Windings Limited | Manufacturing | 1994 |
| Best Yield Property Investments Limited | Real estate | 2021 |
| Bestee Ltd | Transport & logistics | 2020 |
| Bestie Retail Ltd | Wholesale & retail | 2025 |
| Besttoys Moto Limited | Wholesale & retail | 2026 |
| Betfinity Limited | Information & communication | 2020 |
| Betmania Ltd | Information & communication | 2025 |
| Better Cleaner Ltd | Administrative & support | 2026 |
| Better Never Stops Limited | Professional & scientific | 2019 |
| Better Value Carpets Limited | Construction | 2024 |
| Better Youth UK Ltd | Information & communication | 2024 |
| Beulah Heritage Ltd | Real estate | 2025 |
| Beverley Court (Ipswich) Limited | Real estate | 2017 |
| Bexon Estates Ltd | Real estate | 2017 |
| Bexon Management Limited | Real estate | 2021 |
| Beyea Care Limited | Health & social care | 2006 |
| Bfkp Limited | Other services | 2024 |
| BG Audit LLP | | 2002 |
| BG Cloud Limited | Extraterritorial | 2017 |
| BG Holdings Limited | Financial services | 2016 |
| BG Outsourcing Limited | Professional & scientific | 2000 |
| BG Probate Services Limited | Professional & scientific | 2016 |
| BG Registrars Limited | Professional & scientific | 1983 |
| BG Shkolo Ipswich Limited | Education | 2023 |
| BHI Investments Limited | Professional & scientific | 1988 |
| BHL Logistics Ltd | Transport & logistics | 2020 |
| Bhoomichatra (UK) PVT Ltd | Water & waste | 2019 |
| BHS Trans Ltd | Transport & logistics | 2017 |
| BIA Logistics Limited | Transport & logistics | 2016 |
| Biadela Ltd | Transport & logistics | 2018 |
| Biaxol Trade Ltd | Wholesale & retail | 2022 |
| Bicho Health Care Ltd | Health & social care | 2015 |
| Bickers Action Limited | Extraterritorial | 2016 |
| Bickers Action Worldwide Limited | Administrative & support | 2017 |
| Bickers Holdings Limited | Professional & scientific | 1980 |
| Bickers Lifting Limited | Manufacturing | 1999 |
| Bickers of Coddenham Limited | Information & communication | 1976 |
| Biddable Solutions Limited | Professional & scientific | 2012 |
| Bidex Properties and Investments Limited | Real estate | 2025 |
| Bidex Tradings Limited | Transport & logistics | 2020 |
| Big BRO BAO Ltd | Hospitality | 2023 |
| Big Cat Car Transport Ltd | Transport & logistics | 2020 |
| Big Cheese Comedy Club Ltd | Arts & recreation | 2009 |
| Big Drop Brewing Company Limited | Manufacturing | 2016 |
| Big Light Holdings Limited | Extraterritorial | 2002 |
| Big Peter Limited | Transport & logistics | 2021 |
| Big Skies Wealth Management Limited | Financial services | 2016 |
| Big Store Box (Dales Road) Ltd | Real estate | 2022 |
| Big Store Box (Hadleigh Road) Ltd | Real estate | 2022 |
| Big Uk-Store Ltd | Administrative & support | 2023 |
| Big White Space Limited | Professional & scientific | 2002 |
| Bigger Entertainment Ltd | Administrative & support | 2025 |
| Bigs Contractors Limited | Information & communication | 2017 |
| Bikmon Ltd | Construction | 2023 |
| Bilawal Hajj and Umrah Travel CIC | Administrative & support | 2025 |
| Bildeston Newsagents Limited | Wholesale & retail | 2011 |
| Bill Flurrie Ltd | Wholesale & retail | 2026 |
| Bill Hewlett Limited | Other services | 2016 |
| Biller Holdings Limited | Health & social care | 2024 |
| Binarymatter Ltd | Information & communication | 2010 |
| Binder Limited | Administrative & support | 1986 |
| Binder Pollution Control Limited | Professional & scientific | 2003 |
| Bingham Properties & Construction Limited | Construction | 2026 |
| Binoculars for Sale Ltd. | Wholesale & retail | 2023 |
| Binoma Again Limited | Information & communication | 2016 |
| BIO Point Trans Limited | Transport & logistics | 2017 |
| BIO4GAS Limited | Financial services | 2022 |
| Bioco Innovation Limited | Financial services | 2023 |
| Biomation AG Ltd | Professional & scientific | 2025 |
| Biomation Ltd | Professional & scientific | 2006 |
| Biomechanix Bodyworks Limited | Health & social care | 2024 |
| Biorenix Limited | Financial services | 2025 |
| Bira Healthy Minds Ltd | Health & social care | 2021 |
| Birch Electrical Network Services Limited | Energy | 2010 |
| Birch Gate (Wymondham Norfolk) Management Company Limited | Households | 2017 |
| Birch Group Holdings Limited | Construction | 2019 |
| Birch House Compliance Consultancy Services Limited | Professional & scientific | 2017 |
| Birch Peak Performance Ltd | Arts & recreation | 2022 |
| Birches TYE (Burwell) Management Company Limited | Households | 2016 |
| Birdbyte Limited | Information & communication | 2019 |
| Birds Leisure Limited | Wholesale & retail | 2004 |
| Birketts Directors Limited | Extraterritorial | 1990 |
| Birketts Legal Services Limited | Extraterritorial | 1993 |