| Bocian Deli Ltd | Wholesale & retail | 2025 |
| Bocina Limited | Other services | 2021 |
| Bode LV Limited | Wholesale & retail | 2016 |
| Bogdan HGV Trans Ltd | Transport & logistics | 2022 |
| Bold Defense Security Limited | Administrative & support | 2024 |
| Boldovanski Limited | Wholesale & retail | 2026 |
| Bombe County Transport Ltd | Transport & logistics | 2024 |
| Bomber County International Transport Limited | Transport & logistics | 2018 |
| BON Build Limited | Construction | 2023 |
| Bonded by the Brand Limited | Other services | 2024 |
| Bordeaux Services Ltd | Wholesale & retail | 2025 |
| Born Green Ltd | Wholesale & retail | 2024 |
| Boscomms Limited | Information & communication | 2014 |
| Boston & Spalding Pilots Limited | Other services | 2011 |
| Boston Academies Umbrella Trust | Education | 2013 |
| Boston Accountants Limited | Professional & scientific | 2011 |
| Boston Amateur Sports Association Limited(The) | Other services | 1957 |
| Boston Anorak Company Limited | Manufacturing | 1981 |
| Boston Aquatics & Pets Ltd | Wholesale & retail | 2010 |
| Boston Auto Locksmith Limited | Wholesale & retail | 2025 |
| Boston Bouquets Ltd | Wholesale & retail | 2020 |
| Boston Bowl Racing Ltd | Arts & recreation | 2022 |
| Boston Building and Construction Limited | Mining & quarrying | 2018 |
| Boston Business Centre Limited | Professional & scientific | 1988 |
| Boston Campers Ltd | Manufacturing | 2024 |
| Boston Car Center Ltd | Wholesale & retail | 2019 |
| Boston Central Van Hire Ltd | Administrative & support | 2025 |
| Boston College Group Limited | Education | 1993 |
| Boston Commercial Buildings Limited | Construction | 2026 |
| Boston Commercial Centre Limited | Professional & scientific | 2007 |
| Boston Commercial Cleaners Limited | Administrative & support | 2005 |
| Boston Community Transport | Transport & logistics | 2004 |
| Boston Crop Sprayers Limited | Administrative & support | 1996 |
| Boston Culture Group UK C.I.C. | Information & communication | 2026 |
| Boston Delikat Limited | Wholesale & retail | 2012 |
| Boston Discount Store Limited | Wholesale & retail | 2025 |
| Boston Discounts Limited | Wholesale & retail | 2010 |
| Boston Driveways Ltd | Construction | 2025 |
| Boston Engineering Supplies & Services Limited | Manufacturing | 2015 |
| Boston European Supermarket Limited | Wholesale & retail | 2016 |
| Boston Express Travel Service Limited | Transport & logistics | 2019 |
| Boston Financial Planning Limited | Financial services | 2004 |
| Boston Food & Wine Ltd | Wholesale & retail | 2019 |
| Boston Food Ltd | Wholesale & retail | 2024 |
| Boston Fruit Ltd | Wholesale & retail | 2025 |
| Boston Fruit Shop Ltd | Wholesale & retail | 2025 |
| Boston Golf Club Limited | Arts & recreation | 1962 |
| Boston Grammar School | Education | 2012 |
| Boston HGV Testing Station Limited | Transport & logistics | 2009 |
| Boston High School | Education | 2012 |
| Boston Hot TUB Centre Hire Ltd | Wholesale & retail | 2020 |
| Boston Imaging Group Ltd | Health & social care | 2022 |
| Boston Insurance Services Ltd | Financial services | 2016 |
| Boston Kitchen Ltd | Hospitality | 2025 |
| Boston Krispy Ltd | Hospitality | 2026 |
| Boston Landscaping Ltd | Construction | 2024 |
| Boston Leisure Ltd | Hospitality | 2025 |
| Boston Lets Limited | Real estate | 2011 |
| Boston LGV Training Limited | Education | 2003 |
| Boston Lincs Lettings Ltd | Construction | 2014 |
| Boston MOT Centre Limited | Wholesale & retail | 2012 |
| Boston MOT Ltd | Wholesale & retail | 2024 |
| Boston Phoenix Football Club Limited | Arts & recreation | 1988 |
| Boston Pizza Plaza Ltd | Hospitality | 2026 |
| Boston Preservation Trust,Limited(The) | Real estate | 1935 |
| Boston Primary Care Network Ltd | Health & social care | 2022 |
| Boston Rowing Club Ltd | Arts & recreation | 2008 |
| Boston Sausage | Manufacturing | 2014 |
| Boston Seeds Limited | Wholesale & retail | 2001 |
| Boston Self Storage Limited | Transport & logistics | 2004 |
| Boston Shopping Hub (UK) Limited | Wholesale & retail | 2022 |
| Boston Staffing Solutions Ltd | Administrative & support | 2025 |
| Boston Storage Containers Limited | Administrative & support | 2016 |
| Boston Supermarket Ltd | Wholesale & retail | 2020 |
| Boston Town Centre Business Association Limited | Other services | 2026 |
| Boston Truck and Van Limited | Wholesale & retail | 2014 |
| Boston Upper Limb Ltd | Health & social care | 2023 |
| Boston Vape Center Ltd | Wholesale & retail | 2025 |
| Boston Vape Shop Ltd | Wholesale & retail | 2026 |
| Boston Waterways Limited | Transport & logistics | 2014 |
| Boston West Joint Childcare Company Ltd | Education | 1999 |
| Boston West RTM Company Limited | Households | 2008 |
| Boston Windscreens Limited | Wholesale & retail | 2009 |
| Bostonian Ltd | Hospitality | 2024 |
| Bostonmobile Phone Limited | Wholesale & retail | 2020 |
| Bostonplates Ltd | Wholesale & retail | 2024 |
| Bourne in Time Antiques Ltd | Wholesale & retail | 2020 |
| Bourne to Sparkle Ltd | Administrative & support | 2025 |
| Bowman Close (Boston) Managers Limited | Households | 1990 |
| Bowskill Holdings Limited | Construction | 2019 |
| Bowstan Limited | Water & waste | 2007 |
| Box Clever Theatre Company | Education | 1996 |
| BP Air Conditioning and Refrigeration Ltd | Energy | 2024 |
| Bradbury Business Improvement Ltd | Information & communication | 2026 |
| Bradbury Property Management Ltd | Real estate | 2024 |
| Brambles Pet and Wildlife Limited | Wholesale & retail | 2017 |
| BRAND34 Ltd | Manufacturing | 2024 |
| Branded Biker Limited | Extraterritorial | 2009 |
| Branksome Consultancy Ltd | Professional & scientific | 2021 |
| Brew & Bite Boston Ltd | Hospitality | 2025 |