| Basement Holdings Ltd | Other services | 2017 |
| Basement Investments Ltd | Other services | 2011 |
| Bashboundgames Ltd | Information & communication | 2024 |
| Basher's Shop Ltd | Other services | 2025 |
| Bashir Group Ltd | Financial services | 2019 |
| Bashir Homes Limited | Real estate | 2019 |
| Bashir Property Group Limited | Real estate | 2021 |
| Bashir Security Ltd | Administrative & support | 2026 |
| Basithussain Ltd | Health & social care | 2022 |
| Bask Trading Limited | Wholesale & retail | 2023 |
| Baspol Limited | Construction | 2014 |
| Bastek Services Ltd | Administrative & support | 2019 |
| Bastion Operations Limited | Information & communication | 2026 |
| Basu Logistics Ltd | Transport & logistics | 2018 |
| Bataa Group Ltd | Administrative & support | 2023 |
| Batala Construction Ltd | Construction | 2024 |
| Batchwood Contracts Limited | Administrative & support | 2011 |
| Bath Professionals Limited | Wholesale & retail | 2010 |
| Bavdak Limited | Real estate | 2014 |
| Bawan Market Limited | Wholesale & retail | 2025 |
| Baxon Properties Ltd | Real estate | 2019 |
| Bay Tree Lettings Limited | Real estate | 2010 |
| Bayard Developments Limited | Real estate | 1991 |
| Bayethe Limited | Health & social care | 2021 |
| Bayhill (Pharma) Investments Limited | Real estate | 2015 |
| Baymont Investments Ltd | Wholesale & retail | 2024 |
| Bays Properties Limited | Real estate | 2025 |
| Bayview Builders Ltd | Wholesale & retail | 2024 |
| Bazaarxpress Ltd | Wholesale & retail | 2025 |
| Bazan Construction Ltd | Construction | 2025 |
| Bazaraat Ltd | Wholesale & retail | 2025 |
| Bazibuilders Ltd | Construction | 2023 |
| Bazyan Bazar Limited | Wholesale & retail | 2021 |
| Bazz Auto Ltd | Wholesale & retail | 2023 |
| BB Bedfordshire Services Ltd | Construction | 2018 |
| BB Civil Engineering Ltd | Construction | 2013 |
| BB Classics Ltd | Wholesale & retail | 2012 |
| BB Executive Limited | Transport & logistics | 2024 |
| BB Lawz Consulz Ltd | Professional & scientific | 2023 |
| BB Online Asset Management Limited | Extraterritorial | 2005 |
| BB Salvage Ltd | Other services | 2016 |
| Bb-Online UK Limited | Information & communication | 1997 |
| BBA Aviation Business Support Centre - Emea Limited | Administrative & support | 2012 |
| BBA Holdings Limited | Financial services | 1955 |
| BBA Hydraulic Brake Company Limited | Professional & scientific | 1919 |
| BBA Overseas Holdings Limited | Professional & scientific | 1966 |
| Bbac Ltd | Administrative & support | 2025 |
| BBD Beauty by Dawn Limited | Other services | 2025 |
| Bbdl Construction Ltd | Construction | 2007 |
| BBF Property Limited | Real estate | 2021 |
| BBJ Consulting Solutions Ltd | Professional & scientific | 2017 |
| BBK Tailor Developments Ltd | Construction | 2019 |
| Bbsb Construction Company Limited | Construction | 2025 |
| BBT Travels Limited | Administrative & support | 2022 |
| BBW Care Limited | Health & social care | 2025 |
| BC Consumables Limited | Wholesale & retail | 2023 |
| BCB Studios Limited | Information & communication | 2023 |
| BCH Property Holdings Limited | Real estate | 2023 |
| BCP Parking Limited | Extraterritorial | 2005 |
| BD London Limited | Professional & scientific | 2019 |
| Bd&F Ltd | Information & communication | 2011 |
| Bd&Son Construction Ltd Ltd | Construction | 2026 |
| BDH Investments (MK) Ltd | Real estate | 2015 |
| BDM Construction Ltd | Construction | 2016 |
| BDS Catering Limited | Hospitality | 2023 |
| BDS Logistics & Transport Network Ltd | Transport & logistics | 2024 |
| BDS Property Solutions Ltd | Real estate | 2022 |
| BE a Sport Limited | Wholesale & retail | 2021 |
| BE Etiquette Ltd | Education | 2016 |
| BE Etiquette Youth & Community CIC | Education | 2026 |
| BE Finite Events Ltd | Administrative & support | 2024 |
| BE Lleza-Gloss Limited | Wholesale & retail | 2025 |
| BE Loud Marketing Ltd | Professional & scientific | 2024 |
| BE Wealthy Ltd | Real estate | 2025 |
| Beacon Services Limited | Administrative & support | 2026 |
| Beacon Services+ Limited | Administrative & support | 2013 |
| Beaconseek Limited | Information & communication | 2000 |
| Beaconseek Technology Ltd | Information & communication | 2021 |
| Beadlow Property Ltd | Real estate | 2024 |
| Beales. Co Inc Ltd | Wholesale & retail | 2025 |
| Beans Accounting Services Ltd | Professional & scientific | 2021 |
| Bear & Crumb Ltd | Hospitality | 2025 |
| Beard Bros Limited | Wholesale & retail | 2017 |
| Bearsted Takeaway Ltd | Hospitality | 2019 |
| Beas&Frame Construction Ltd | Construction | 2024 |
| Beast Trucks Ltd | Transport & logistics | 2021 |
| Beat the Property Agent Ltd | Real estate | 2026 |
| Beatrice Star Limited | Professional & scientific | 2026 |
| Beau and Jolie Properties Ltd | Real estate | 2023 |
| Beaumont Court Residents Association Limited | Households | 2000 |
| Beaus & Sashes Ltd | Hospitality | 2021 |
| Beautique Health & Beauty Ltd | Other services | 2019 |
| Beauty & Care Boutique & Spa Limited | Health & social care | 2014 |
| Beauty and PMU Supplies Ltd | Wholesale & retail | 2025 |
| Beauty Blossom Ltd | Wholesale & retail | 2026 |
| Beauty Cosmetics (Bedford) Limited | Wholesale & retail | 2019 |
| Beauty Deluxe Academy Ltd | Other services | 2019 |
| Beauty Elements Training Academy Limited | Other services | 2019 |
| Beauty Line Aesthetics Limited | Other services | 2024 |
| Beauty Nails for YOU Ltd | Other services | 2016 |