| B.A.L Recruit Limited | Transport & logistics | 2015 |
| B.D.M. Crisp Limited | Construction | 2005 |
| B.Daiv Ltd | Wholesale & retail | 2026 |
| B.English & SON Limited | Agriculture & fishing | 1962 |
| B.Kids Consulting Ltd | Professional & scientific | 2026 |
| B.M.C Automotive Ltd | Wholesale & retail | 2021 |
| B.P.C.S. Limited | Real estate | 1976 |
| B10SUB Ltd | Transport & logistics | 2026 |
| B25 Solutions Limited | Professional & scientific | 2025 |
| B2B Travel Agency UK Ltd | Administrative & support | 2024 |
| B4 Fire Ltd | Public administration | 2015 |
| B4UDIG Ltd | Construction | 2026 |
| B737 Training Ltd | Education | 2024 |
| BA Estate Management Ltd | Real estate | 2022 |
| BA Logistics Ltd | Transport & logistics | 2022 |
| BAB AL Khayrat Ltd | Wholesale & retail | 2024 |
| Baba-Z Limited | Other services | 2011 |
| Baban RQ Ltd | Wholesale & retail | 2021 |
| Babble Tavern Limited | Hospitality | 2022 |
| Babes | | 1987 |
| Babewyn Ltd | Professional & scientific | 2018 |
| Babilonn Limited | Wholesale & retail | 2025 |
| Baby Art Scanning Ipswich Limited | Health & social care | 2023 |
| Baby Art Studios (Ipswich) Limited | Professional & scientific | 2019 |
| BAC & PAK Services Ltd | Transport & logistics | 2019 |
| Back the Brook Ltd | Hospitality | 2013 |
| Back Yourself Ltd | Professional & scientific | 2026 |
| Backlash Music Limited | Information & communication | 2022 |
| Backup Systems Ltd | Information & communication | 2006 |
| BAD Limited | Wholesale & retail | 2023 |
| Bade Healthcare Ltd | Health & social care | 2016 |
| Badger Fuels Limited | Wholesale & retail | 2002 |
| Badgers Burrow Limited | Financial services | 2026 |
| Badgers Construction Limited | Real estate | 2026 |
| Badshah & Sons Limited | Real estate | 2020 |
| Badshah Sons Ltd | Real estate | 2020 |
| BAE Hair and Beauty Limited | Other services | 2025 |
| BAE9 Consulting Ltd | Professional & scientific | 2026 |
| BAG AGG Limited | Extraterritorial | 2014 |
| Bagel Club Ltd | Hospitality | 2020 |
| Baggex Group Ltd | Transport & logistics | 2022 |
| Bahica C and D Ltd | Other services | 2022 |
| Baidey Ltd | Information & communication | 2024 |
| Bailey Brothers and Associates Limited | Professional & scientific | 2002 |
| Bailey GAS Solutions Ltd | Construction | 2026 |
| Bailey Stays Limited | Real estate | 2023 |
| Bailey Whitaker Ltd | Transport & logistics | 2026 |
| Baird Freight Management Ltd | Transport & logistics | 2025 |
| Baje Associates Limited | Education | 2012 |
| Bake My Cheat Ltd | Hospitality | 2018 |
| Baker & Taylor UK Investments Limited | Financial services | 2007 |
| Baker Builds Construction & Landscaping Ltd | Construction | 2025 |
| Baker Lamb Consulting Limited | Manufacturing | 2011 |
| Bakers Bands Ltd | Wholesale & retail | 2022 |
| Balazs Trans Ltd | Transport & logistics | 2025 |
| Baldwins Department Stores Limited | Wholesale & retail | 2010 |
| Balfour Foods Ltd | Other services | 2018 |
| Bali Haulage Ltd | Transport & logistics | 2018 |
| Ball & Chalk Limited | Manufacturing | 2019 |
| Balla Trans Limited | Transport & logistics | 2025 |
| Ballams Limited | Other services | 2011 |
| Ballantines Blinds & Awnings Ltd | Wholesale & retail | 2012 |
| Ballingdon Capital Limited | Agriculture & fishing | 2015 |
| Ballingdon Investment Management Limited | Financial services | 2017 |
| Ballistic Badger Limited | Wholesale & retail | 2017 |
| Baltic Court Apartments Ltd | Real estate | 2022 |
| Baltija Transport Limited | Transport & logistics | 2020 |
| Bamford Drive (Bury ST Edmunds) Block Management Company Limited | Households | 2025 |
| Ban&Ban Limited | Construction | 2023 |
| Bananaby Ltd | Real estate | 2017 |
| Banbury Howard Design Limited | Professional & scientific | 2014 |
| Banbury Howard Ltd | Professional & scientific | 2009 |
| Banbury Water Gardens Limited | Other services | 2006 |
| Bancroft Logistics & Distribution Ltd | Transport & logistics | 2014 |
| Bangkok Heightz Ltd | Hospitality | 2018 |
| Bantock Accountants Ltd | Professional & scientific | 2009 |
| Bantock Accounting & Advisory Ltd | Professional & scientific | 2026 |
| Bar a to Z Limited | Hospitality | 2020 |
| Bar Twenty One (Bury ST Edmunds) Limited | Hospitality | 2024 |
| Barakah Incorporation Ltd | Wholesale & retail | 2019 |
| Baran Catering Services Ltd | Manufacturing | 2021 |
| Barbara SUE Aesthetics Ltd | Other services | 2022 |
| Barber Construction Group Ltd | Construction | 2024 |
| Barber Skeels Limited | Other services | 2011 |
| Barberbuild & Landscaping Ltd | Administrative & support | 2023 |
| Barberhood Ipswich Ltd | Other services | 2023 |
| Barbican Events Limited | Other services | 2021 |
| Barbot Limited | Administrative & support | 2016 |
| Barbour Pharmacy Ltd | Other services | 2022 |
| Bardan Holdings Limited | Financial services | 2024 |
| Bardan Property Developments Limited | Construction | 2024 |
| Bardan Property Management Limited | Real estate | 2024 |
| Barden Property Ltd | Real estate | 2023 |
| Bare & Bloom Beauty Ltd | Other services | 2025 |
| Barefoot & Gilles Limited | Professional & scientific | 2010 |
| Barentsburg Investments Limited | Financial services | 2019 |
| Bargains Direct Limited | Wholesale & retail | 2025 |
| Bargains Discounts Ltd | Professional & scientific | 2024 |
| Barguzin Performance Marketing LP | | 2021 |
| Barke Holdings Limited | Financial services | 2023 |