| Aydinn Maintenance Limited | Construction | 2024 |
| Ayesha Shahzad Ltd | Wholesale & retail | 2024 |
| Ayeshan Limited | Professional & scientific | 2025 |
| Ayinks UK Limited | Health & social care | 2024 |
| Aykon CYP Services Ltd | Health & social care | 2025 |
| Ayotabs Limited | Health & social care | 2013 |
| Ayoub KRD Ltd | Wholesale & retail | 2025 |
| Ayra Cards & Gifts Ltd | Wholesale & retail | 2020 |
| Ayra Healthcare Ltd | Health & social care | 2018 |
| Ayra Properties Ltd | Financial services | 2018 |
| Aysa Chauffeurs Limited | Transport & logistics | 2019 |
| Ayslebury Limited | Wholesale & retail | 2024 |
| AYT DRY Cleaners Limited | Administrative & support | 2025 |
| Ayub International Ltd | Wholesale & retail | 2025 |
| Ayush Consulting Ltd | Professional & scientific | 2026 |
| Ayush Party Limited | Wholesale & retail | 2018 |
| Aywa Trading Ltd | Information & communication | 2020 |
| Ayzal Global Limited | Wholesale & retail | 2023 |
| Ayzalux Ltd | Wholesale & retail | 2026 |
| AZ & a Construction Limited | Construction | 2023 |
| AZ Chohaan Enterprise Ltd | Extraterritorial | 2016 |
| AZ Interiors Studio Ltd | Construction | 2025 |
| AZ Master Limited | Construction | 2013 |
| AZ Projects Ltd | Construction | 2015 |
| AZ Tuition Services Limited | Professional & scientific | 2013 |
| Az.Haz.Mc Ltd | Professional & scientific | 2026 |
| AZA Distribution Limited | Wholesale & retail | 2022 |
| Azas Ventures Ltd | Extraterritorial | 2023 |
| Azensa Ltd | Real estate | 2024 |
| Azhar Logistics Ltd | Transport & logistics | 2020 |
| Azhin Mehrparwar Ltd | Wholesale & retail | 2025 |
| Azik Limited | Health & social care | 2021 |
| Azik Rayyan Holdings Limited | Real estate | 2023 |
| Aziz & Khanom Co Ltd | Health & social care | 2021 |
| Aziz and Tara Co Ltd | Real estate | 2025 |
| Aziz at the Tree Ltd | Hospitality | 2019 |
| Azmat Driving School Ltd | Education | 2022 |
| Azmir Travel Limited | Administrative & support | 2022 |
| Azmyn Ltd | Wholesale & retail | 2025 |
| AZN Global Limited | Information & communication | 2024 |
| Azuchi.K.K Limited | Real estate | 2025 |
| Azue Groups Ltd | Wholesale & retail | 2024 |
| Azur - MGM Limited | Professional & scientific | 2007 |
| Azure Drinks Ltd | Wholesale & retail | 2015 |
| Azyazfaz Ltd | Health & social care | 2021 |
| B & D Glassmasters Limited | Construction | 1992 |
| B & D Pest Control Limited | Administrative & support | 2009 |
| B & H Interiors Limited | Construction | 2016 |
| B & H Transport London Ltd | Transport & logistics | 2026 |
| B a Field Services Limited | Construction | 2015 |
| B and KAY Security Ltd | Administrative & support | 2020 |
| B B Laundrette Limited | Other services | 2018 |
| B Brothers Properties Ltd | Real estate | 2026 |
| B Creative Construction Ltd | Construction | 2022 |
| B Ernest & Co UK Limited | Wholesale & retail | 2017 |
| B J Tyres & Exhausts Limited | Wholesale & retail | 2010 |
| B Klean Limited | Administrative & support | 2024 |
| B L C Gibb Limited | Professional & scientific | 2019 |
| B Lofts Conversion Ltd | Construction | 2021 |
| B N B Recovery & Storage UK Limited | Wholesale & retail | 2020 |
| B Phlebotomy I Ltd | Health & social care | 2025 |
| B S CAD Draughting Ltd | Information & communication | 2000 |
| B&A Carpentry Ltd | Construction | 2022 |
| B&A Lettings Limited | Real estate | 2026 |
| B&A Plumbing Limited | Construction | 2019 |
| B&D Tyres & Servicing Ltd | Wholesale & retail | 2018 |
| B&G Contractors Ltd | Construction | 2020 |
| B&G Group Services Ltd | Construction | 2022 |
| B&G Lofts Ltd | Construction | 2022 |
| B&Ll Construction Ltd | Construction | 2015 |
| B&M Auto London Ltd | Wholesale & retail | 2026 |
| B&P Design and Construction Ltd | Construction | 2013 |
| B&R Bars Ltd | Construction | 2016 |
| B-Precise Limited | Professional & scientific | 2007 |
| B. R. Wise Ltd. | Wholesale & retail | 1992 |
| B.Deka Limited | Construction | 2014 |
| B.M. Plumbing & Electrical Ltd | Construction | 2018 |
| B.Mane Ltd | Other services | 2026 |
| B.Shira Ltd | Construction | 2023 |
| B.Smith Electrical Services Limited | Construction | 2014 |
| B.T.V. Limited | Professional & scientific | 1993 |
| B2B Educators UK Ltd | Education | 2022 |
| B2B Exports UK Ltd | Wholesale & retail | 2023 |
| B2PHARM Ltd. | Health & social care | 2015 |
| B3RK Limited | Hospitality | 2025 |
| B45 Film Productions Limited | Information & communication | 2025 |
| BA Capital Limited | Real estate | 2023 |
| BA Muchwa Cleaning Company Ltd | Administrative & support | 2025 |
| BA Partnership (Hatton Gardens) Limited | Real estate | 2024 |
| BA Partnership (London) Limited | Real estate | 2020 |
| Baarik Traders Ltd | Wholesale & retail | 2015 |
| Babbar Transport Ltd | Transport & logistics | 2025 |
| Babjum Property Consultant Ltd | Real estate | 2024 |
| Babsart Ltd | Arts & recreation | 2025 |
| Baby & Beyond Limited | Health & social care | 2022 |
| Baby Sensory (Romford and Gideapark) Ltd | Education | 2024 |
| Baby Sensory Colchester West Ltd | Education | 2021 |
| Baby Steps Preschool Limited | Health & social care | 2025 |
| Baby Waves Ltd | Education | 2022 |
| Babyboo Ltd | Health & social care | 2025 |