| BB Contractors NW Ltd | Construction | 2026 |
| BB Flights Ltd | Transport & logistics | 2024 |
| BB Wedding Cars & Events Ltd | Administrative & support | 2017 |
| BBQ Truck Stop-Community Ltd | Wholesale & retail | 2026 |
| BBY Partners Property Limited | Real estate | 2019 |
| BC Taxcounter Limited | Professional & scientific | 2020 |
| Bchq Ltd | Arts & recreation | 2024 |
| BCI Group Ltd | Information & communication | 2020 |
| Bctv MAP Limited | Professional & scientific | 2019 |
| Bctv Sutton Limited | Real estate | 2018 |
| BD Systems (Europe) Ltd | Wholesale & retail | 2011 |
| Bdagency Lead Ltd | Wholesale & retail | 2025 |
| BE AS YOU ARE CIC | Arts & recreation | 2025 |
| BE Good T.V. Ltd | Administrative & support | 2013 |
| BE Grounded Collective Ltd | Wholesale & retail | 2025 |
| BE Logistics (Suffolk) Limited | Transport & logistics | 2001 |
| BE Phamy Ltd | Other services | 2023 |
| BE Warehousing & Transport Limited | Transport & logistics | 1986 |
| Be.Home Estates Ltd | Real estate | 2024 |
| BEA Telecom Limited | Wholesale & retail | 2025 |
| Beach Property Ltd | Real estate | 2022 |
| Beach Scaffolding Services Ltd | Construction | 2025 |
| Beal Investments Limited | Real estate | 2024 |
| Beam Films Ltd | Information & communication | 2024 |
| Beanie Money Ltd | Professional & scientific | 2024 |
| Beanstalk Global Ltd | Information & communication | 2020 |
| Bear & Koala Developments Limited | Information & communication | 2019 |
| Bear Clinics Limited | Education | 2025 |
| Bearded Media Ltd | Information & communication | 2026 |
| Beare Essentials Limited | Information & communication | 2013 |
| Beastie BOY Productions Ltd | Information & communication | 2026 |
| Beatrice Carter Property Ltd | Real estate | 2021 |
| Beats Travel Limited | Administrative & support | 2014 |
| Beauford Wedding Cars Ltd | Transport & logistics | 2019 |
| Beaufort Investment Properties Ltd | Real estate | 2026 |
| Beaut Services Ltd | Professional & scientific | 2026 |
| Beauties of Bodin Initiative Ltd | Health & social care | 2022 |
| Beautiful Beers East Anglia (UK) Limited | Wholesale & retail | 2019 |
| Beauty & the Blend Ltd | Wholesale & retail | 2021 |
| Beauty by Sarah Ltd | Health & social care | 2013 |
| Beauty Garden Home Limited | Wholesale & retail | 2023 |
| Beauty&You Cosmetic LAB Ltd | Manufacturing | 2026 |
| Beccamacmahon Ltd | Wholesale & retail | 2018 |
| Bechkwin Community Connections (BCC) CIC | Administrative & support | 2017 |
| Bechkwin Ltd | Wholesale & retail | 2013 |
| Beck ROW Auto Dismantlers Ltd | Water & waste | 2007 |
| Beck ROW Junk Yard Ltd | Administrative & support | 2016 |
| Beckford Residential Homes Ltd | Health & social care | 2025 |
| Beckit Ltd | Information & communication | 2024 |
| Becky's Skin Clinic Ltd | Other services | 2025 |
| Become Bodywise Ltd | Arts & recreation | 2023 |
| Become Brands Ltd | Wholesale & retail | 2025 |
| Become Your Change Ltd | Professional & scientific | 2025 |
| Becoming a Woman CIC | Wholesale & retail | 2024 |
| Bedfield Plant Hire Limited | Administrative & support | 2024 |
| Bedshub Ltd | Wholesale & retail | 2025 |
| BEE Internet Ltd | Information & communication | 2005 |
| Beeches Road Management Limited | Households | 2023 |
| Beehosting Belfast Limited | Real estate | 2024 |
| Beehosting Liverpool Limited | Households | 2024 |
| Beehosting Newcastle Limited | Real estate | 2025 |
| Beehosting Property Management Ltd | Real estate | 2022 |
| Beehuz Ltd | Wholesale & retail | 2025 |
| Bees Knees Couriers Ltd | Transport & logistics | 2025 |
| Beeton Close 1962 Limited | Extraterritorial | 2014 |
| Beevie Ltd | Construction | 2025 |
| BEF Consulting Limited | Professional & scientific | 2025 |
| Begbie Homes Ltd | Real estate | 2023 |
| Begulan Ltd | Wholesale & retail | 2025 |
| Behaviour Made Simple Ltd | Education | 2026 |
| Bekka Hair Ltd | Wholesale & retail | 2026 |
| BEL Ombre Holdings Limited | Financial services | 2022 |
| Belatu Ltd | Professional & scientific | 2026 |
| Belay Media Group Ltd | Manufacturing | 2023 |
| Belchamp Farm Services Limited | Administrative & support | 1988 |
| Belgian Crispo Ltd | Hospitality | 2026 |
| Belgravia Capital Holdings Limited | Information & communication | 2009 |
| Belgrove Place Management Limited | Households | 2017 |
| Bell Property Partners Limited | Real estate | 2024 |
| Bella Cruz Limited | Wholesale & retail | 2025 |
| Bella's Kitch Ltd | Wholesale & retail | 2025 |
| Bellabooth Ltd | Administrative & support | 2023 |
| Bellco Trading Company Ltd | Wholesale & retail | 2026 |
| Belle & Co Limited | Manufacturing | 2013 |
| Belle Farm Limited | Wholesale & retail | 2021 |
| Bellevieu Limited | Professional & scientific | 2014 |
| Belleville Holdings Ltd | Real estate | 2021 |
| Bells Four Property Ltd | Real estate | 2025 |
| Belltash Properties Limited | Real estate | 2026 |
| Belluber Ltd. | Professional & scientific | 2015 |
| Bellyverse Ltd | Wholesale & retail | 2025 |
| Belmat Asset Management Ltd | Real estate | 2020 |
| Belsalesuk Ltd | Wholesale & retail | 2026 |
| Belvadere Construction Ltd | Construction | 2024 |
| Belvedere Boar Limited | Hospitality | 2025 |
| BEN Bonnett Fencing Ltd | Administrative & support | 2024 |
| BEN Broughton Ltd | Professional & scientific | 2025 |
| BEN England Music Limited | Information & communication | 2021 |
| Bendall PUB Group Limited | Hospitality | 2018 |
| Bendani Services Ltd | Health & social care | 2022 |