| Athvika Ltd | Wholesale & retail | 2023 |
| Atico Construction Ltd | Construction | 2023 |
| Atihad Group Ltd | Wholesale & retail | 2025 |
| Atisa Holdings Ltd | Real estate | 2024 |
| Atlantic Pools & Fountains UK Ltd | Construction | 2024 |
| Atop Consulting International Ltd | Education | 2022 |
| ATQ Services Ltd | Transport & logistics | 2021 |
| Attaul Haee Manan Limited | Wholesale & retail | 2021 |
| Attique & Co Accountants Ltd | Professional & scientific | 2020 |
| Audley Chaucer Law Ltd | Professional & scientific | 2025 |
| AUI Capital Investments Ltd | Real estate | 2018 |
| AUN Ways Limited | Wholesale & retail | 2025 |
| Auntie Ania Childcare Limited | Health & social care | 2026 |
| Aura Pictures Ltd | Information & communication | 2023 |
| Aurevia Ventures Ltd | Information & communication | 2026 |
| Aurora Consultancy (UK) Limited | Professional & scientific | 2012 |
| Aurora Law (UK) Ltd | Administrative & support | 2016 |
| Auto-Tech Enterprises Limited | Wholesale & retail | 2010 |
| Autobahn Autos Limited | Wholesale & retail | 2024 |
| Automaison International Ltd | Wholesale & retail | 2025 |
| Autonomous Energy Ltd | Professional & scientific | 2019 |
| Avadhannla Ltd | Information & communication | 2019 |
| Avaizur Limited | Wholesale & retail | 2014 |
| Avenue Commercial Limited | Financial services | 2024 |
| Avenue Flooring Limited | Construction | 2009 |
| Aviaz Ltd | Wholesale & retail | 2025 |
| Avista Law Ltd | Professional & scientific | 2021 |
| AVM Property Group Ltd | Real estate | 2025 |
| Avon Air Conditioning Limited | Construction | 2019 |
| Avon U.K Limited | Transport & logistics | 2025 |
| Avva Ltd. | Wholesale & retail | 2013 |
| AW Heating Commercial Limited | Construction | 2018 |
| Awan Solutions Ltd | Administrative & support | 2026 |
| Awan Tech Ltd | Construction | 2020 |
| Awan Trading Ltd | Transport & logistics | 2020 |
| Awatto Limited | Information & communication | 2008 |
| Awazeurdu Ltd | Manufacturing | 2025 |
| AWN Trading Ltd | Transport & logistics | 2024 |
| Awsome Property Ltd | Real estate | 2025 |
| AWZ Aerospace International Ltd | Wholesale & retail | 2024 |
| Axia London Ltd | Transport & logistics | 2012 |
| Axis Medtech Limited | Wholesale & retail | 2025 |
| Axon Healthcare Ltd | Health & social care | 2026 |
| Axperf Limited | Information & communication | 2018 |
| AYA Gourmet Ltd | Wholesale & retail | 2024 |
| Ayaan General Trading Company Ltd. | Wholesale & retail | 2022 |
| Ayaan Investment Properties Ltd | Real estate | 2024 |
| Ayzal UK Trading Ltd | Education | 2024 |
| AZ Assets Ltd | Real estate | 2023 |
| AZ MK Trading Limited | Health & social care | 2021 |
| Azhar Mahmood Limited | Arts & recreation | 2002 |
| Azhar Trading Limited | Manufacturing | 2016 |
| Azlan Driving School Ltd | Wholesale & retail | 2016 |
| Azmat Limited | Construction | 2019 |
| Azmee Trading Ltd | Wholesale & retail | 2026 |
| B & R Velinov's Ltd | Transport & logistics | 2010 |
| B & T Plant Hire Limited | Construction | 1992 |
| B & W Spinclean Solutions Ltd | Water & waste | 2025 |
| B Driveways & Landscaping Ltd | Construction | 2020 |
| B&K Driving School Ltd | Education | 2023 |
| B&K Holds Ltd | Financial services | 2024 |
| B&Z London Limited | Transport & logistics | 2021 |
| B.A Medical Solutions Ltd | Health & social care | 2023 |
| B.S Locum Ltd | Health & social care | 2023 |
| BAB London Trading Ltd | Wholesale & retail | 2016 |
| Baba London Ltd | Administrative & support | 2024 |
| Babs Construction Ltd | Construction | 2021 |
| Back Office Warriors Ltd | Administrative & support | 2016 |
| Back on the Move Osteopathy Limited | Health & social care | 2023 |
| Backdrop Constructions Ltd | Other services | 2014 |
| Badar Bookkeeping Ltd | Professional & scientific | 2025 |
| Badass Studios Limited | Professional & scientific | 2020 |
| Bader & Partners Limited | Professional & scientific | 2025 |
| Badmus & Co Limited | Professional & scientific | 2015 |
| Badshah TV Ltd | Professional & scientific | 2024 |
| Baecd Ltd | Financial services | 2024 |
| Bagri Bytes Limited | Information & communication | 2005 |
| Baho Ltd | Transport & logistics | 2022 |
| Bajwa Estates Ltd | Real estate | 2020 |
| Bajwa Trading Ltd | Wholesale & retail | 2019 |
| Bake My Day Ltd. | Manufacturing | 2012 |
| Baker CB Limited | Construction | 2025 |
| Bala Accountants & Auditors Limited | Professional & scientific | 2017 |
| Balcanic Taste Ltd | Wholesale & retail | 2013 |
| Balen Consulting Ltd | Information & communication | 2019 |
| Balen Estates Ltd | Real estate | 2021 |
| Balham Express Ltd | Other services | 2014 |
| Balham Nails & Beauty Limited | Other services | 2018 |
| Ball Productions Limited | Arts & recreation | 2025 |
| Baloms Professional Care Limited | Health & social care | 2024 |
| Banaex Limited | Construction | 2024 |
| Band Baja Viah Limited | Hospitality | 2024 |
| Bandhi Ltd | Wholesale & retail | 2020 |
| Bangkok Brew Ltd | Manufacturing | 2026 |
| Bangla Bazaar Ltd | Wholesale & retail | 2026 |
| Bani Hashim Limited | Transport & logistics | 2017 |
| Bann Design Studio Limited | Professional & scientific | 2016 |
| Bar Innovation Limited | Hospitality | 2021 |
| Bar London Trading Ltd | Transport & logistics | 2025 |
| Bar Trading Ltd | Transport & logistics | 2020 |