| Allytash Limited | Wholesale & retail | 2024 |
| Almahmud Gate Ltd | Hospitality | 2021 |
| Almino Limited | Real estate | 2015 |
| Alpha & Omega Creations Limited | Wholesale & retail | 2020 |
| Alpha AR Ltd | Wholesale & retail | 2025 |
| Alpha Beta Gamma Ltd. | Information & communication | 2019 |
| Alpha Master NN Ltd | Financial services | 2025 |
| Alphaprosper Limited | Administrative & support | 2025 |
| Alpine Toys Ltd | Wholesale & retail | 2025 |
| Alrhman Ltd | Education | 2023 |
| Alromany London Limited | Real estate | 2020 |
| Alros Properties Limited | Real estate | 2018 |
| ALS Maintenance Limited | Construction | 2020 |
| Alsa Trading Ltd | Wholesale & retail | 2025 |
| Alsham 2 Ltd | Real estate | 2016 |
| Alsion Ltd | Construction | 2018 |
| Alsultan Cargo & Services Ltd | Transport & logistics | 2024 |
| Altaif Money Transfer Limited | Financial services | 2014 |
| Altayou Finance & Technology Ltd | Information & communication | 2009 |
| Alteza Ceilings Limited | Manufacturing | 2021 |
| Altima Construction Ltd | Construction | 2017 |
| Altre Limited | Real estate | 2025 |
| AM Automotive Perivale Ltd | Wholesale & retail | 2026 |
| AM Cleaning Service Ltd | Administrative & support | 2025 |
| AM Football Mastery & Sport Education Ltd | Education | 2023 |
| AM Groundworks Ltd | Construction | 2020 |
| Amadeu Solutions Ltd | Information & communication | 2018 |
| Amaik Consultants Ltd | Real estate | 2016 |
| Amaik Investments Ltd | Financial services | 2025 |
| Amal Consultancy Ltd | Professional & scientific | 2021 |
| Amalhotra Ltd | Wholesale & retail | 2025 |
| Aman Property Management Ltd | Real estate | 2024 |
| Amanda's Action Club Parties Limited | Arts & recreation | 2012 |
| Amanda's Salon Ltd | Other services | 2018 |
| Amanzion Limited | Wholesale & retail | 2026 |
| Amari Havodda Limited | Real estate | 2018 |
| Amazing Management LLP | | 2021 |
| Amazing Nails Ltd | Other services | 2023 |
| Amazingly Natural Ltd | Wholesale & retail | 2026 |
| Ambaa Ltd | Real estate | 2022 |
| Amberino Ltd | Real estate | 2024 |
| Ambika Finance Limited | Real estate | 2018 |
| Ambika Logistics Ltd | Transport & logistics | 2021 |
| Amd-Research Matters Ltd | Other services | 2017 |
| Amethyst Galaxy Ltd | Transport & logistics | 2019 |
| AMG Tiling Ltd | Construction | 2021 |
| Amigo Parties Ltd | Arts & recreation | 2022 |
| Amin & KEE Property Ltd | Real estate | 2025 |
| Amir Hassan Ltd | Professional & scientific | 2025 |
| Amit Dubey Ltd | Professional & scientific | 2023 |
| AML Cleaning Ltd | Administrative & support | 2017 |
| Amon-Ra Fitness Ltd | Other services | 2023 |
| Ampm Global Limited | Wholesale & retail | 2013 |
| Amptel Ltd | Wholesale & retail | 2022 |
| Amrani Limited | Health & social care | 2008 |
| Amrex Services Limited | Professional & scientific | 2009 |
| Amrit Logistics Ltd | Transport & logistics | 2025 |
| AMT Investments (2011) Limited | Extraterritorial | 2011 |
| AMT Property Investments Limited | Real estate | 2011 |
| AMY Builders Ltd. | Construction | 2014 |
| AN Design and Print Limited | Professional & scientific | 2015 |
| ANA Barreto (UK) Limited | Professional & scientific | 2014 |
| ANA Barreto Limited | Other services | 2013 |
| ANA Gabriela Martinez Design Ltd | Professional & scientific | 2025 |
| Anahata Therapy Ltd | Health & social care | 2022 |
| Ananta Pharma Limited | Wholesale & retail | 2024 |
| Anantanova Global Holding Limited | Professional & scientific | 2025 |
| Anar Stays Ltd | Hospitality | 2026 |
| Anari Juice Ltd | Manufacturing | 2026 |
| Anastasiei Ltd | Construction | 2014 |
| Anblack Limited | Real estate | 2021 |
| Ancu Tech Ltd | Manufacturing | 2026 |
| Andover Close Residents Limited | Households | 2000 |
| Andrea Diving Limited | Arts & recreation | 2023 |
| Andrei Antonescu Ltd | Transport & logistics | 2022 |
| Andrei Topli Ltd | Other services | 2025 |
| Anfipo Ltd | Wholesale & retail | 2017 |
| Angel's Touch Cleaning Service Ltd | Administrative & support | 2026 |
| Angelfield Estates Ltd | Real estate | 2021 |
| Angelfield Property Services Ltd | Real estate | 2014 |
| Angelot Shutters Ltd | Wholesale & retail | 2017 |
| Angels Prestige Ltd | Wholesale & retail | 2026 |
| Angolano Investments Limited | Hospitality | 2024 |
| Angrish Development Ltd | Real estate | 2023 |
| Angrish Holdings Limited | Financial services | 2023 |
| Angwa Ventures Limited | Health & social care | 2013 |
| Animus Physique Ltd | Wholesale & retail | 2021 |
| Anish International Ltd | Financial services | 2025 |
| Anjani Tailors Limited | Professional & scientific | 2025 |
| Ankalp Limited | Financial services | 2026 |
| ANM Global Services Ltd | Administrative & support | 2026 |
| Anna Innovations Ltd | Real estate | 2025 |
| Annara Limited | Other services | 2018 |
| Ansh & Kayra UK Ltd | Wholesale & retail | 2023 |
| Ansh Group Ltd | Real estate | 2022 |
| Anwar Investments Limited | Real estate | 2010 |
| Anwar Lettings Limited | Real estate | 2006 |
| Anwar-Ent Ltd | Health & social care | 2018 |
| Anytime Concrete Limited | Manufacturing | 2002 |
| Anytime Concrete London Limited | Manufacturing | 2025 |