| Arisien Ltd | Real estate | 2015 |
| ASD Child Limited | Public administration | 2022 |
| Aset Stiftung Ltd | Professional & scientific | 2015 |
| ASH Carpentry & Joinery Limited | Construction | 2019 |
| Ashling Engineering Limited | Professional & scientific | 2024 |
| ASP Services Limited | Information & communication | 2007 |
| Association of Italian Chefs in U.K. Limited | Other services | 2021 |
| Assured Install Solutions Ltd | Construction | 2020 |
| Astoria Sports Wallington Limited | Arts & recreation | 1997 |
| ASV Consulting Limited | Arts & recreation | 2018 |
| Athena Resourcing Solutions Limited | Administrative & support | 2010 |
| Atlantis Global FM Ltd | Real estate | 2024 |
| Atlas Flowers (Holdings) Limited | Other services | 2022 |
| Atlas Flowers Limited | Wholesale & retail | 1990 |
| Authentiq Ltd | Professional & scientific | 2018 |
| Autoklima Limited | Professional & scientific | 2018 |
| Avery Capital Limited | Financial services | 2025 |
| AWC Property Partners Limited | Construction | 2025 |
| AWL Logistic Services Limited | Other services | 2014 |
| Axel Developments Limited | Construction | 1994 |
| Ayesha Murray Coaching Ltd | Professional & scientific | 2021 |
| Azim E Services Ltd | Administrative & support | 2023 |
| Azott Developments Ltd | Construction | 2024 |
| B & a Management Ltd | Professional & scientific | 2017 |
| B.E. Drylining Limited | Other services | 2016 |
| Baby Sensory Blackheath Limited | Education | 2023 |
| Baby Sensory Dulwich Limited | Education | 2021 |
| Barham Private Finance Ltd | Financial services | 2024 |
| Barimore Building Services Limited | Construction | 2013 |
| Barimore Property Limited | Real estate | 2014 |
| Barry Road Holdings Ltd | Real estate | 2017 |
| Bartella Artist Management Ltd | Information & communication | 2023 |
| Bartlebooth Ltd | Information & communication | 2014 |
| Baseline Realty Limited | Real estate | 2025 |
| BCT Plus Ltd | Administrative & support | 2024 |
| BE Active Social Enterprise CIC | Professional & scientific | 2011 |
| BE Civils Ltd | Construction | 2022 |
| Beach Sign Ltd | Wholesale & retail | 2022 |
| Beastie Builds Ltd | Wholesale & retail | 2024 |
| Beau Plan Investments Ltd | Real estate | 2009 |
| Beauty by Soph Ltd. | Other services | 2023 |
| Beccehamian Rugby Football Club Limited | Arts & recreation | 2015 |
| Becophet Limited | Information & communication | 2024 |
| BEE BEE Properties UK Limited | Real estate | 1998 |
| BEE Legal Limited | Professional & scientific | 2021 |
| Beitel Care Services Ltd | Health & social care | 2020 |
| Bell&Coproperties Ltd | Real estate | 2025 |
| Bellvia Enterprises Ltd | Financial services | 2026 |
| Bellvia Fitness (Chelmsford) Ltd | Arts & recreation | 2026 |
| Bellvia Fitness Ltd | Arts & recreation | 2026 |
| Bellvia Property Company Ltd | Real estate | 2026 |
| BEN Green Design Ltd | Professional & scientific | 2022 |
| Benakama Ltd | Information & communication | 2024 |
| Bentley Creative Ltd | Information & communication | 2012 |
| Bert and BEE Ltd | Wholesale & retail | 2023 |
| Bespoke Buildings & Construction Limited | Construction | 2007 |
| Bespoke Electrical Services Technicians Limited | Administrative & support | 2003 |
| Best Coffee Ever Ltd | Hospitality | 2025 |
| Beth Hardwick Copy and Comms Ltd | Professional & scientific | 2022 |
| Bibi Jewellery Ltd | Manufacturing | 2024 |
| Bigart Creative Limited | Construction | 2020 |
| Bionzo Ltd | Real estate | 2020 |
| BJSJ1 Ltd | Hospitality | 2021 |
| BKS Traders Ltd | Wholesale & retail | 2024 |
| Black & Blanc Company Ltd | Real estate | 2017 |
| Black Heart Media Ltd | Information & communication | 2010 |
| Black Taxi Tour London Ltd | Transport & logistics | 2023 |
| Blackbird Property Group Limited | Hospitality | 2025 |
| Blackshed Limited | Construction | 2022 |
| Blay Krofa Estates Limited | Real estate | 2020 |
| Blitzed Media Limited | Information & communication | 2025 |
| Blue Legend Investments Limited | Real estate | 2012 |
| Blumire Guram Limited | Professional & scientific | 2004 |
| BOB Broadhurst Limited | Administrative & support | 2013 |
| Body Prodigy Limited | Wholesale & retail | 2022 |
| Borocco Ltd | Professional & scientific | 2018 |
| Boundary 105 Limited | Real estate | 2019 |
| Boxerfs Ltd | Financial services | 2023 |
| Bozhinovski Limited | Professional & scientific | 2017 |
| BP Technical Consulting Ltd | Professional & scientific | 2015 |
| BR4 Pizza Ltd | Hospitality | 2026 |
| Bradley R Mitchell Limited | Financial services | 2022 |
| Brass and Bloom Ltd | Hospitality | 2025 |
| Brindlefox Ltd | Professional & scientific | 2025 |
| Brix Property SW9 Limited | Construction | 2023 |
| Broadoaks Projects Ltd | Construction | 2024 |
| Bromley Decorating & Maintenance Ltd | Construction | 2021 |
| Bromley House Management Company Limited | Households | 2004 |
| Bromley Pest Control Limited | Administrative & support | 2017 |
| Bromley Vape Company Ltd | Wholesale & retail | 2019 |
| Brookson (5655E) Limited | Professional & scientific | 2007 |
| Build Safely Ltd | Construction | 2022 |
| Built & Better Limited | Construction | 2022 |
| Burford LEE Limited | Administrative & support | 2012 |
| Burning Blue Developments Limited | Construction | 2006 |
| Business Support Consulting Limited | Information & communication | 2023 |
| Butler Mechanical Services Ltd | Construction | 2014 |
| Buttoned UP Limited | Wholesale & retail | 2022 |
| Buzzbox Coffee Group Ltd | Wholesale & retail | 2023 |
| BY Bibi Jewellery Limited | Manufacturing | 2024 |