| Andrea Webb Consulting Limited | Professional & scientific | 2018 |
| Anidi Properties Ltd | Real estate | 2025 |
| Animah-Ba Limited | Construction | 2024 |
| Apera Medical Ltd | Health & social care | 2026 |
| Apolon Ltd | Construction | 2018 |
| Aquabeve Ltd | Wholesale & retail | 2017 |
| AR Cloud Solutions Ltd | Information & communication | 2020 |
| ARC8 Limited | Construction | 2024 |
| Ardenta Consulting Limited | Information & communication | 2013 |
| Ardmeen Ltd | Real estate | 2024 |
| Argoprojects Ltd | Construction | 2023 |
| Arja Online Limited | Professional & scientific | 2019 |
| Arlon Aviation Consulting Ltd | Professional & scientific | 2025 |
| Artistic Decor 49 Ltd | Wholesale & retail | 2018 |
| Ascendant Property Ventures Ltd | Financial services | 2025 |
| Ashford Process and Engineering Solutions Ltd | Manufacturing | 2018 |
| Ashlashuk Ltd | Other services | 2025 |
| Ashwood Properties Limited | Real estate | 2012 |
| Aspire Office Limited | Extraterritorial | 2013 |
| Asquith Watch Repairs Limited | Other services | 2024 |
| Astech Group Ltd | Information & communication | 2022 |
| Astra Unicus Limited | Information & communication | 2021 |
| Atin Creation Kitchen & Bedroom Ltd | Other services | 2019 |
| AUH Services Limited | Construction | 2025 |
| Authentic Skin Ltd | Other services | 2025 |
| Auto Pride London Ltd | Wholesale & retail | 2025 |
| Auto TEK Motors Ltd | Wholesale & retail | 2020 |
| Automart Car Sales Ltd | Wholesale & retail | 2023 |
| AV3NU3 One Limited | Real estate | 2022 |
| Avanco Cars Limited | Wholesale & retail | 2025 |
| Aventus AA Ltd | Professional & scientific | 2019 |
| Avenue Advisers Limited | Information & communication | 2025 |
| Avenue Aesthetics Limited | Other services | 2020 |
| Avenue Pensions Limited | Financial services | 2016 |
| Avenue Trading Ltd | Wholesale & retail | 2021 |
| AVM Limited | Professional & scientific | 2005 |
| AVM Vision Investments Ltd | Professional & scientific | 2012 |
| Avmi Group Limited | Professional & scientific | 2012 |
| Avmi Kinly Ltd | Professional & scientific | 1990 |
| Axiosoft Limited | Information & communication | 2026 |
| Axten Construction Ltd | Construction | 2019 |
| AYT Services Limited | Transport & logistics | 2024 |
| Azzgas Heating & Plumbing Limited | Other services | 2018 |
| B & F Autos Limited | Wholesale & retail | 2019 |
| B B Builders (Middlesex) Limited | Construction | 2006 |
| B12DJD Ltd | Professional & scientific | 2016 |
| Babelon-Line Limited | Professional & scientific | 2002 |
| Ball London Ltd | Professional & scientific | 2024 |
| Balloonbx Limited | Wholesale & retail | 2021 |
| Bamboo & Coconut Ltd | Wholesale & retail | 2019 |
| Bangles for Angels UK Limited | Wholesale & retail | 2020 |
| Banh Limited | Real estate | 2018 |
| Baqtiyan Properties Ltd | Real estate | 2024 |
| Barrass Electrical Services Ltd | Construction | 2014 |
| Barrett Collective Ltd | Information & communication | 2026 |
| Barrington Court Property Management Company Limited | Households | 1968 |
| Basingstoke Local Trading Ltd | Hospitality | 2025 |
| Battson Designs Limited | Arts & recreation | 2025 |
| Bcbabu Cloud Consulting Ltd | Information & communication | 2026 |
| BCL Transport Ltd | Transport & logistics | 2024 |
| BE Loud BE Proud Ltd | Other services | 2025 |
| Bear Music Ltd | Information & communication | 2022 |
| Beatmyfare Limited | Administrative & support | 2008 |
| Beatty Consultancy Ltd | Professional & scientific | 2026 |
| Been There Ltd | Education | 2019 |
| Beketo Ltd | Manufacturing | 2019 |
| Bellamy Interiors & Exteriors Ltd | Construction | 2022 |
| Berwick 26 Consulting Ltd | Professional & scientific | 2026 |
| Bestword Translation Ltd | Professional & scientific | 2026 |
| Bettermove Property Services Ltd | Construction | 2019 |
| Betterview Roofing Ltd | Construction | 2025 |
| Beyond Hngt Ltd | Real estate | 2020 |
| Bhandal Constructions Ltd | Construction | 2021 |
| Bibliotek Academic Professionale Ltd | Information & communication | 2010 |
| Biotanic Healthcare Limited | Wholesale & retail | 2026 |
| Birds Management Company Limited | Households | 1981 |
| Bitlific Ltd. | Information & communication | 2013 |
| BIZ Analytics Ltd | Information & communication | 2014 |
| Black Rose Consultancy & Training Limited | Education | 2015 |
| Blackcel Limited | Information & communication | 2024 |
| Blackout Electrics Ltd | Construction | 2026 |
| Blue Cart Ltd | Wholesale & retail | 2025 |
| Blue Horse Construction Ltd | Construction | 2019 |
| Blue Horse HPE Ltd | Wholesale & retail | 2024 |
| Blue Initiative Ltd | Professional & scientific | 2017 |
| Blue Personnel Limited | Administrative & support | 2001 |
| Blue Water 83 Ltd | Real estate | 2025 |
| Bluelynk Services Ltd | Information & communication | 2010 |
| Bmaa Properties Ltd | Real estate | 2017 |
| Bmaa Solutions Ltd | Information & communication | 2025 |
| Bmac Enterprises Ltd | Wholesale & retail | 2021 |
| Bmas Accountants Ltd | Professional & scientific | 2020 |
| BMG Catering Limited | Hospitality | 2026 |
| Bond Street (Englefield Green) Management Company Limited | Households | 2003 |
| Borispro Limited | Other services | 2022 |
| Bottle Bros Limited | Professional & scientific | 2025 |
| Bourne Effects Limited | Arts & recreation | 2012 |
| Bourne Mews Management Company Ltd | Households | 2014 |
| Bradbury Hallbrook Limited | Professional & scientific | 2024 |
| Bradshaw-Brooks Ltd | Manufacturing | 2020 |