| Bcitech Consulting Ltd. | Information & communication | 2016 |
| BCL Properties Limited | Real estate | 2020 |
| BCT Franchise Ltd | Hospitality | 2024 |
| BD Nuclear Limited | Construction | 2006 |
| Bdse Limited | Construction | 2023 |
| BDW Builders Limited | Construction | 2017 |
| BDW Services Limited | Financial services | 2021 |
| BE in Comfort Ltd | Real estate | 2025 |
| Be's Barbers Ltd | Other services | 2014 |
| Beachside Ventures Limited | Administrative & support | 2022 |
| Beaconsfield Property Management Limited | Households | 2019 |
| Beady EYE Cctv Ltd | Administrative & support | 2018 |
| Beady EYE Security Ltd | Administrative & support | 2016 |
| Beames Construction Ltd | Construction | 2014 |
| Beames Contractors Limited | Construction | 2020 |
| Beames Group Limited | Financial services | 2020 |
| Beames Property Limited | Real estate | 2015 |
| Bear & Timber Ltd | Construction | 2019 |
| Bear Bones BBQ Co Limited | Manufacturing | 2024 |
| Beatrice Mews Cosham Management Company Limited | Households | 1991 |
| Beautiful Bells Limited | Other services | 2014 |
| Beauty at Halo Ltd | Other services | 2012 |
| Beauty Clinic Aesthetics Ltd | Other services | 2019 |
| Beauty Retreat & Co (Southern) Limited | Other services | 2024 |
| Beboss Barbers Limited | Other services | 2024 |
| Beck Property Investments Ltd | Real estate | 2016 |
| Beck Property Rentals Limited | Real estate | 2013 |
| Becky and Angie Limited | Health & social care | 2014 |
| Becky's Natural Aesthetics Limited | Professional & scientific | 2023 |
| Bedazzled Cleaning (South) Ltd | Administrative & support | 2014 |
| Bedborough Electrics Limited | Construction | 2005 |
| BEE Jays Contractors Limited | Other services | 2014 |
| Beeeasie Ltd | Manufacturing | 2025 |
| Beepe Limited | Information & communication | 2021 |
| Beer Salons Limited | Other services | 2023 |
| Beer’S Bodywork Ltd | Wholesale & retail | 2021 |
| Beju BE YOU Ltd | Wholesale & retail | 2025 |
| Bekktek Ltd | Wholesale & retail | 2025 |
| Belgrave Investments IOW Limited | Construction | 2023 |
| Belgravia INV Ltd | Real estate | 2011 |
| Believe & Achieve Events Limited | Arts & recreation | 2012 |
| Bell Integration Limited | Information & communication | 2011 |
| Bell Microsystems Limited | Information & communication | 1995 |
| Bell Properties (South) Limited Liability Partnership | | 2008 |
| Bell Rigging Access Services Limited | Manufacturing | 2010 |
| Belle Beauty UK Ltd | Other services | 2006 |
| Bellford Investments Limited | Real estate | 2017 |
| Bellord & Brown Ltd | Hospitality | 2017 |
| Bells Cleaning Services Ltd | Administrative & support | 2012 |
| Belt-Up Safety Products Ltd | Other services | 2017 |
| Bemoreurban Limited | Extraterritorial | 2004 |
| BEN Care Solutions Limited | Health & social care | 2020 |
| BEN IS Running Ltd | Information & communication | 2025 |
| Benco Design Build Ltd. | Construction | 2018 |
| Bendys Bait Ltd | Wholesale & retail | 2025 |
| Benefit Wave Limited | Information & communication | 2021 |
| Benevelle Healthcare Ltd | Health & social care | 2024 |
| Bengal Express Takeaway Ltd | Hospitality | 2012 |
| Bengal Tiger Property Ltd | Real estate | 2022 |
| Benham Painting & Decorating Ltd | Construction | 2010 |
| Benjamin Todd Limited | Arts & recreation | 2015 |
| Benjamins Foundations Ltd | Construction | 2006 |
| Benrow Solutions Ltd | Administrative & support | 2023 |
| Bentley Properties (Cardiff) Limited | Real estate | 2001 |
| Berat Kaya Limited | Wholesale & retail | 2021 |
| Beresford Court RTM Company Limited | Households | 2014 |
| BERF2015 Ltd | Hospitality | 2020 |
| Bernie Eaden Electrical Ltd | Construction | 2019 |
| Berry Nice Group Ltd | Hospitality | 2025 |
| Besoco Ltd | Information & communication | 2021 |
| Bespoke Education Solutions Ltd | Education | 2008 |
| Bespoke PV Ltd | Construction | 2024 |
| Bespoke Sport Design Limited | Manufacturing | 2024 |
| Bespoke Tiling (UK) Ltd | Construction | 2011 |
| Best & Jones Ltd | Manufacturing | 2023 |
| Best Care 2022 Ltd | Health & social care | 2018 |
| Best Events Limited | Arts & recreation | 2021 |
| Best Flora Ltd | Wholesale & retail | 2019 |
| Best Kebab London Road Ltd | Hospitality | 2016 |
| Best Pizza and Kebab House Ltd | Hospitality | 2020 |
| Best Pizza Portsmouth Ltd | Hospitality | 2022 |
| Best Tower Consultant Ltd | Wholesale & retail | 2025 |
| BEST1 Floor Sander PVT Ltd | Administrative & support | 2018 |
| Bethan R a Ltd | Information & communication | 2023 |
| Betterday Care Solutions Ltd. | Health & social care | 2016 |
| Beverage Standards Association | Other services | 1996 |
| Beverley Lettings Limited | Real estate | 2024 |
| Bevis Estates Limited | Real estate | 2025 |
| Beworks Automation Ltd | Professional & scientific | 2020 |
| Bexie Energy UK Limited | Wholesale & retail | 2026 |
| Bext Solutions Limited | Administrative & support | 2019 |
| Beyond Boundaries Consultancy Ltd | Education | 2014 |
| Beyond Bricklaying Ltd | Construction | 2024 |
| BFL Fitness Ltd | Arts & recreation | 2019 |
| BG Fire Protection Ltd | Construction | 2019 |
| BG Food 2023 Ltd | Wholesale & retail | 2023 |
| BG Install Limited | Professional & scientific | 2018 |
| BGA Re-Balling and Recovery Ltd | Professional & scientific | 2002 |
| BGD21 Ltd | Water & waste | 2022 |
| BGS Brickwork Ltd | Construction | 2024 |