| Blue DOT Partners Ltd | Professional & scientific | 2022 |
| Blue Haven Digital Ltd | Information & communication | 2023 |
| Blue Horizon Global Ltd | Agriculture & fishing | 2023 |
| Blue India Ltd | Hospitality | 2017 |
| Blue Leone Ltd | Hospitality | 2023 |
| Blue Lizard Security Ltd | Administrative & support | 2024 |
| Blue Mission Technology Limited | Manufacturing | 2024 |
| Blue Moon Events and Hospitality Limited | Hospitality | 2015 |
| Blue Property (UK) Ltd | Real estate | 2012 |
| Blue Realm Ltd | Administrative & support | 2023 |
| Blue Shark Security Ltd | Administrative & support | 2020 |
| Blue Tang Plumbing and Heating Ltd | Construction | 2021 |
| Bluebell Technologies Ltd | Professional & scientific | 2015 |
| Bluebells Property Ltd | Real estate | 2024 |
| Bluecurve Consulting Ltd | Information & communication | 2024 |
| Bluedigit Business Solutions Ltd | Information & communication | 2023 |
| Bluegem Logistics Ltd | Transport & logistics | 2019 |
| Bluehouse Electrical Limited | Construction | 2019 |
| Bluejaykjp Ltd | Real estate | 2025 |
| Bluemoonformation Limited | Administrative & support | 2025 |
| Blues Driving School (Central Bedfordshire) Ltd | Education | 2019 |
| Blues Driving School Ltd | Education | 2019 |
| Bluesky Adjusters Ltd | Administrative & support | 2020 |
| Bluetp Ltd | Information & communication | 2023 |
| Bluewater Global Limited | Administrative & support | 2012 |
| Bluewave Pressure Pros Ltd | Administrative & support | 2026 |
| BLUINC17 Ltd | Administrative & support | 2023 |
| Blumi Ltd | Wholesale & retail | 2019 |
| Blunham Mews Management Co. Limited | Households | 1986 |
| Blunham Safety Services Limited | Professional & scientific | 2017 |
| Blunham Transport Ltd | Transport & logistics | 2022 |
| Blushing Iris Limited | Administrative & support | 2026 |
| BM Bedford Cars Ltd | Wholesale & retail | 2019 |
| BM Cinema Ltd | Hospitality | 2025 |
| BM Garden Services Ltd | Administrative & support | 2026 |
| BM Properteys Ltd | Real estate | 2023 |
| BMA General Builders Ltd | Construction | 2017 |
| BMB Electrics Ltd | Construction | 2008 |
| Bmics Ltd | Information & communication | 2025 |
| BMK Property Holdings Ltd | Real estate | 2025 |
| BMN Investments Limited | Construction | 2010 |
| BMP Doors Ltd | Wholesale & retail | 2011 |
| Bmpm Ltd | Construction | 2017 |
| BMR Health and Wellbeing Ltd | Health & social care | 2019 |
| BN Audit Services Limited | Professional & scientific | 2023 |
| Bnbselect.Com Limited | Arts & recreation | 2009 |
| BNC Motoproject Ltd | Manufacturing | 2017 |
| BNG Property Management Limited | Real estate | 2022 |
| Board M.I. Ltd | Information & communication | 2015 |
| Boat House Fitness Club Ltd | Other services | 2024 |
| BOB Broad (Driving) Ltd | Transport & logistics | 2026 |
| BOD (Oxford) Ltd | Professional & scientific | 2021 |
| Body and Mind Reboot Limited | Extraterritorial | 2017 |
| Body Charge Studios Limited | Health & social care | 2023 |
| Body Focus Coaching Ltd | Arts & recreation | 2021 |
| Bodypartner Limited | Wholesale & retail | 2017 |
| Boely Limited | Professional & scientific | 2018 |
| Bogacki Limited | Construction | 2008 |
| Bogacki Property Limited | Real estate | 2006 |
| BOH Home Ltd | Wholesale & retail | 2020 |
| Bohania Films Ltd | Information & communication | 2024 |
| Bojia Solutions Ltd | Administrative & support | 2022 |
| Bold Beauty Aesthetics Ltd | Other services | 2025 |
| Boldlight Limited | Professional & scientific | 2013 |
| Boleyn Innovations Ltd | Information & communication | 2020 |
| Bolina Accounting Limited | Professional & scientific | 2024 |
| Bolt Transportation Ltd | Transport & logistics | 2022 |
| Bolton Communications Limited | Professional & scientific | 2008 |
| Bolyn Consulting Limited | Information & communication | 2025 |
| Bombaybfd Ltd | Hospitality | 2019 |
| Bomipro Ltd | Health & social care | 2024 |
| Bond & Hobbs Limited | Real estate | 2024 |
| Bond Corporate Finance Ltd | Professional & scientific | 2014 |
| Bond Venture Intoware Ltd | Information & communication | 2015 |
| Bondchase Limited | Construction | 1993 |
| Bonelli Properties Ltd | Real estate | 2023 |
| Bonito Bikes Ltd | Administrative & support | 2012 |
| Bonnel Construction Limited | Construction | 2013 |
| Bonnel Homes Limited | Real estate | 2010 |
| Bonum Fidei Ltd | Financial services | 2017 |
| Boodsta Group Ltd | Information & communication | 2024 |
| Book a Mechanic Ltd | Wholesale & retail | 2023 |
| Book a Party DJ Ltd | Arts & recreation | 2025 |
| Book a Trade Ltd | Information & communication | 2026 |
| Bookalet Ltd | Other services | 2019 |
| Bookkeeping Collective Ltd | Professional & scientific | 2020 |
| Books-Everywhere Limited | Information & communication | 2020 |
| Boomerang Construction and Developments Limited | Construction | 2017 |
| Boon&Family Ltd | Professional & scientific | 2019 |
| Booster Transport Ltd | Transport & logistics | 2023 |
| Bopris Trans Limited | Transport & logistics | 2015 |
| BOQ Investments Limited | Agriculture & fishing | 2021 |
| Born to BE Powerful Ltd | Information & communication | 2022 |
| Born to Train Ltd | Arts & recreation | 2013 |
| Boro Eastlink Ltd | Transport & logistics | 2023 |
| Boro Haulage Ltd | Transport & logistics | 2013 |
| BOS Films Ltd | Information & communication | 2014 |
| Bosa Healthcare Ltd | Health & social care | 2021 |
| Bose Care Ltd | Health & social care | 2016 |
| Bostock Building Contractors Limited | Construction | 2002 |