| Bayes Printing Limited | Manufacturing | 1999 |
| Bazenov Ltd | Wholesale & retail | 2015 |
| BB Consulting Services Ltd | Professional & scientific | 2025 |
| BBA Products Limited | Wholesale & retail | 2016 |
| BBC (UK) Ltd | Construction | 2009 |
| BCC Digital Ltd | Information & communication | 2022 |
| BCP Survey Ltd | Construction | 2015 |
| Bcredimus Ltd | Information & communication | 2018 |
| BD Contract Solutions Ltd | Administrative & support | 2014 |
| BD Managing Ltd | Real estate | 2024 |
| Bdhq Consulting Ltd | Information & communication | 2025 |
| Bdlx Ltd | Professional & scientific | 2023 |
| BDS Private Limited | Transport & logistics | 2025 |
| BE Comfy Accommodation Ltd | Construction | 2026 |
| BE Landscaping Ltd | Construction | 2025 |
| BE Lucky Stay Sharp Limited | Transport & logistics | 2025 |
| BE Ready Coaching Limited | Other services | 2025 |
| Beaconpoint CIC | Health & social care | 2026 |
| Beadstack Ltd | Manufacturing | 2022 |
| Beam Reach Geek Limited | Information & communication | 2020 |
| Beata Szwast Ltd | Professional & scientific | 2018 |
| Beatha Foras Developments Limited | Manufacturing | 2021 |
| Beatrice Harding Consultancy Ltd | Real estate | 2024 |
| Beautclinic Ltd | Other services | 2020 |
| Beautifully Announced Limited | Other services | 2014 |
| Beauty Look Limited | Wholesale & retail | 2011 |
| Beauty Therapy Worldwide Ltd | Other services | 2018 |
| Beautybabz Ltd | Other services | 2025 |
| Beccles 24/7 Fitness Limited | Arts & recreation | 2016 |
| Bechmann Consultancy Limited | Professional & scientific | 2021 |
| Bednarz Ltd | Transport & logistics | 2017 |
| BEE Trans Limited | Transport & logistics | 2015 |
| Beechbrook Farm (Land) Limited | Extraterritorial | 2003 |
| Beechcroft Property Partnership Limited | Administrative & support | 2015 |
| Beeches Court (Bromley) Residents Association Limited | Households | 1959 |
| Beechland Estates Ltd | Real estate | 2024 |
| Beed Luxury Ltd | Wholesale & retail | 2022 |
| Beef Bar Ltd | Hospitality | 2025 |
| Beeline Accounts Ltd | Transport & logistics | 2001 |
| Begeo Limited | Information & communication | 2026 |
| Bejan Property Ltd | Administrative & support | 2025 |
| Bejan Transport Ltd | Transport & logistics | 2023 |
| Belerancia Bakes Ltd | Manufacturing | 2023 |
| Belgravia New Build Developments Ltd | Construction | 2019 |
| Bell Workwear Limited | Wholesale & retail | 1993 |
| Bell+Gavel Limited | Transport & logistics | 2020 |
| Bella QS Ltd | Professional & scientific | 2020 |
| Bella's Bouquets Ltd | Wholesale & retail | 2018 |
| Bella-Alise Ltd | Households | 2026 |
| Bella-Dav Ltd | Manufacturing | 2020 |
| Bellakg Limited | Manufacturing | 2015 |
| Bellisima Hair Ltd | Other services | 2002 |
| Bellmere Group Ltd | Construction | 2025 |
| Bello Pizzeria Ltd | Hospitality | 2022 |
| Bellview Technologies Limited | Information & communication | 1997 |
| Belmia Energy Ltd | Professional & scientific | 2018 |
| Belmont Park Freehold Company Limited | Households | 1998 |
| Beloved Homes Limited | Real estate | 2023 |
| Beloved Homes Property Limited | Real estate | 2024 |
| Bemdizio Limited | Wholesale & retail | 2013 |
| Bemelle Property Management Ltd | Real estate | 2025 |
| Bems Electro-Technical Limited | Construction | 2022 |
| BEN Kenny Construction Limited | Construction | 2015 |
| BEN Martin Flooring Ltd | Construction | 2021 |
| BEN Nuttall Farriery Ltd | Agriculture & fishing | 2026 |
| Bengals Food Ltd | Wholesale & retail | 2016 |
| Benim Adam Ltd | Transport & logistics | 2024 |
| Bennett Grab Services Limited | Water & waste | 2012 |
| Benning Brothers Ltd | Construction | 1997 |
| Benning Construction (Kent) Limited | Construction | 2020 |
| Bentonite (Manufacturing & Supply) Limited | Manufacturing | 2009 |
| Bereta Investments Limited | Real estate | 2010 |
| Beriyth Healthcare Ltd | Public administration | 2024 |
| Berkley Build Ltd | Construction | 2025 |
| Berryview Care Group Limited | Health & social care | 2024 |
| Bese Limited | Information & communication | 2018 |
| Besimplified Integrated Services Ltd | Real estate | 2024 |
| Bespoke Building Services Ltd | Real estate | 2024 |
| Bespoke Builds Kent Limited | Construction | 2021 |
| Bespoke Lighting and Electrics Limited | Construction | 2025 |
| Bespoke Pro's Ltd | Manufacturing | 2021 |
| Best 1 Aircon and Heating Ltd | Construction | 2022 |
| Best Choize Properties Ltd | Real estate | 2022 |
| Best Drylining Ltd | Construction | 2015 |
| Best Quality Textiles Ltd | Wholesale & retail | 2025 |
| Best Turkish Kitchen Limited | Hospitality | 2024 |
| BEST2 Care Ltd | Health & social care | 2018 |
| Beta Builders London Limited | Construction | 2019 |
| Beta Sigma Fraternity UK Limited | Other services | 2023 |
| Beth Davs Healthcare Services Ltd | Health & social care | 2019 |
| Bethland Ltd | Health & social care | 2021 |
| Bethmeh Consulting Limited | Information & communication | 2017 |
| Betsham Park Corner Management Limited | Households | 1998 |
| Better 0FF Clothing Ltd | Wholesale & retail | 2025 |
| Better by Miles T/A the Eagle Ltd | Hospitality | 2019 |
| Better Families Social Work Services Ltd | Health & social care | 2021 |
| Betterliving Care Limited | Health & social care | 2017 |
| Beulah Care Training and Services Limited | Administrative & support | 2022 |
| Beulah Consulting Limited | Professional & scientific | 2015 |
| Bevan Plumbing & Heating Limited | Construction | 2008 |