| Axiom One Limited | Professional & scientific | 2024 |
| Axiom Weave Ltd | Information & communication | 2025 |
| Axom.Ai Ltd | Information & communication | 2026 |
| Ayanae Ltd | Wholesale & retail | 2021 |
| Ayishat Life Sciences Ltd | Professional & scientific | 2026 |
| Ayona Ltd | Wholesale & retail | 2025 |
| Ayurmedics Clinic Limited | Manufacturing | 2020 |
| Azure Technologies Limited | Information & communication | 2017 |
| B &S Moving Ltd | Construction | 2025 |
| B K Design Associates | | 2002 |
| B&J Properties Ltd | Real estate | 2018 |
| B.T.C. British Tower Corporation Limited | Wholesale & retail | 2017 |
| B95 Brands Ltd | Wholesale & retail | 2022 |
| Babiesandtoddlers Limited | Wholesale & retail | 2013 |
| Baby Sensory Sutton Limited | Education | 2016 |
| Baca Chess CIC | Education | 2026 |
| Baca UK Chess Ltd | Administrative & support | 2026 |
| Backsoon Ltd | Information & communication | 2025 |
| Bafowama Hospitality Inspirations Ltd. | Administrative & support | 2020 |
| Baileys Entertainments Ltd | Hospitality | 2021 |
| Balakai Consulting Ltd | Information & communication | 2019 |
| Balco Sped Services Ltd | Transport & logistics | 2021 |
| Balentos Construction (PVT) Ltd | Construction | 2025 |
| Ballybrook Investments 1 Limited | Administrative & support | 2022 |
| Ballybrook Investments 2 Limited | Administrative & support | 2022 |
| Ballybrook Investments 3 Limited | Administrative & support | 2022 |
| Ballybrook Investments 4 Limited | Administrative & support | 2022 |
| Ballybrook Investments 5 Limited | Administrative & support | 2022 |
| Baltimore House Wimbledon Limited | Households | 2006 |
| Bamboo Dream Ltd | Wholesale & retail | 2023 |
| Bamboo Dream Property Ltd | Real estate | 2023 |
| Bandaruestate Ltd | Real estate | 2023 |
| Banstead Construction Ltd | Construction | 2020 |
| Bar Bella Ltd | Hospitality | 2017 |
| Barkademy Ltd | Agriculture & fishing | 2025 |
| Barlytics Company Limited | Information & communication | 2026 |
| Barrons Court Management Company Limited | Households | 1989 |
| Base Fire Limited | Construction | 2012 |
| Basildon ACR Ltd | Professional & scientific | 2020 |
| Batesshaw Property Ltd | Real estate | 2022 |
| Bath Drilling Direct Limited | Construction | 2026 |
| Baxterhouse Properties Ltd | Real estate | 2024 |
| BC & F Accountancy Ltd | Professional & scientific | 2020 |
| BCR Electrical and Building Services Limited | Construction | 2024 |
| BDG Security Limited | Administrative & support | 2005 |
| BDR Property Investments Ltd | Real estate | 2020 |
| Bears DEN Holdings Ltd | Professional & scientific | 2024 |
| Becky Barrett Management Ltd | Arts & recreation | 2014 |
| Beco.Me Ltd | Arts & recreation | 2015 |
| Beddlestead Sporting Club | Arts & recreation | 2024 |
| BEE Town Coffee Limited | Hospitality | 2024 |
| Beechcroft Lodge Management Company Limited | Households | 1984 |
| Beechcroft RE Limited | Administrative & support | 2019 |
| Beeches Advisory Limited | Professional & scientific | 2019 |
| Behaviour Boxes Ltd | Wholesale & retail | 2023 |
| Being at Work Limited | Health & social care | 2015 |
| Bell Accounting (Sutton) Limited | Professional & scientific | 2014 |
| Bell CSS Limited | Professional & scientific | 2019 |
| Bella AI Ltd | Information & communication | 2024 |
| Belli Design & Co. Ltd | Professional & scientific | 2024 |
| Bellucci & Layland Limited | Professional & scientific | 2009 |
| Belmont Heights Residents Company Limited | Households | 1994 |
| Beltsov Interiors Ltd | Construction | 2023 |
| Beni's Barbers Limited | Other services | 2016 |
| BEP Construction Services Ltd | Construction | 2025 |
| Berkeley Mercantile Ltd | Wholesale & retail | 2010 |
| Berkshire Musketeers Ltd | Education | 2026 |
| Beryan Therapies Limited | Health & social care | 2026 |
| Bespoke Luxury Escapes Limited | Real estate | 2021 |
| Bespoke Mortgage Services Ltd | Financial services | 2019 |
| Bespoke Swimming Pools Limited | Construction | 2009 |
| Best Buy Enterprise Limited | Wholesale & retail | 2017 |
| Best Vape Ltd | Wholesale & retail | 2025 |
| Bestasia International PVT Limited | Wholesale & retail | 2023 |
| Bettys Glamour Box Limited | Wholesale & retail | 2014 |
| Bextor Services Limited | Hospitality | 2016 |
| Beyond Bathrooms and Plumbing Limited | Construction | 2017 |
| Beyond Beauty Rooms Ltd | Other services | 2023 |
| Beyond Human Rights Compliance LLP | | 2024 |
| Bezal-Uk Limited | Professional & scientific | 2025 |
| BH Global Consultancy Ltd | Information & communication | 2010 |
| Bhas Solutions Ltd | Information & communication | 2018 |
| Bhavin Vyas Consulting Limited | Administrative & support | 2017 |
| BIG3 Commerce Private Ltd | Information & communication | 2018 |
| Billie James - Oriental Casting Agency Limited | Arts & recreation | 2010 |
| Billtex Business Limited | Wholesale & retail | 2025 |
| Bilton Land Limited | Real estate | 2011 |
| Bincleaves Property Management Limited | Real estate | 2016 |
| Binq Group Ltd | Wholesale & retail | 2024 |
| Bint Ventures Limited | Information & communication | 2025 |
| Bioplax Limited | Wholesale & retail | 2004 |
| Birch Media Limited | Other services | 2010 |
| Birdhouse Surrey Ltd | Real estate | 2020 |
| Bismark Barbers Ltd | Other services | 2025 |
| Bison Roofing Ltd | Construction | 2023 |
| Biswand Ltd | Construction | 2023 |
| Bisy Property Limited | Real estate | 2013 |
| BIZ Safety Ltd | Financial services | 2021 |
| BJM Dental Laboratory Ltd | Health & social care | 2019 |
| BJM Dynamics Ltd | Health & social care | 2023 |