| AMG Construction Limited | Construction | 2005 |
| Aminepsm Consulting UK Ltd | Wholesale & retail | 2025 |
| Aminh Ltd | Professional & scientific | 2024 |
| Aminullah Ltd | Wholesale & retail | 2025 |
| Amir Faraz Ltd | Wholesale & retail | 2025 |
| Amirald Ltd | Wholesale & retail | 2020 |
| Amitaff Development Ltd | Wholesale & retail | 2021 |
| Amitie Limited | Transport & logistics | 2012 |
| AMJ Cars Ltd | Wholesale & retail | 2018 |
| Amjed Ahmed Limited | Wholesale & retail | 2025 |
| Amjg Professional Services Ltd | Professional & scientific | 2016 |
| AMK IT Ltd | Information & communication | 2025 |
| AMM Logistics Limited | Transport & logistics | 2014 |
| Amoco Ltd | Construction | 2023 |
| Amoore Property Group Ltd | Real estate | 2023 |
| Amorecco Limited | Manufacturing | 2024 |
| Ampek Limited | Real estate | 2017 |
| Amplifi Impact Consulting Ltd. | Professional & scientific | 2025 |
| Amplify Media Promotions Ltd | Professional & scientific | 2025 |
| Amplify Music Online Ltd | Professional & scientific | 2024 |
| AMS Engineering Solutions Ltd | Information & communication | 2012 |
| Amsr Accountancy Ltd | Professional & scientific | 2018 |
| Amtac International Limited | Wholesale & retail | 2025 |
| Amtec Computer Services Ltd | Information & communication | 2012 |
| AMZ Seller Assistant Limited | Professional & scientific | 2023 |
| Anaapp.Io Limited | Information & communication | 2020 |
| Anaesthetic Solutions Limited | Health & social care | 2021 |
| Anagnostaras Ltd | Construction | 2016 |
| Analogue World Limited | Wholesale & retail | 2024 |
| Anant 81 Limited | Wholesale & retail | 2023 |
| Anaribayev Limited | Wholesale & retail | 2024 |
| Anaxes Ltd | Professional & scientific | 2021 |
| Anayah Traders Limited | Wholesale & retail | 2021 |
| Anbro Foods Limited | Wholesale & retail | 2026 |
| Ancestra Nutrition Ltd | Manufacturing | 2023 |
| Anchor Brands Limited | Professional & scientific | 2013 |
| Anchor HR Ltd | Administrative & support | 2016 |
| Anchor VA Ltd. | Administrative & support | 2026 |
| Anchorage Services Limited | Construction | 2017 |
| Anchored Therapy Ltd | Health & social care | 2024 |
| Anchorpharm Limited | Administrative & support | 2018 |
| AND, Breathe CIC | Education | 2026 |
| AND, Breathe Collective Ltd | Health & social care | 2025 |
| Andal Holdings Ltd | Professional & scientific | 2023 |
| Andels Ecom Ltd | Wholesale & retail | 2024 |
| Anders Creative Ltd | Wholesale & retail | 2023 |
| Andfor Ltd | Manufacturing | 2023 |
| Andrea Garland Ltd | Manufacturing | 2012 |
| Andrew Caughey Osteopathic Clinic Limited | Health & social care | 2005 |
| Andrew Composites Ltd | Manufacturing | 2021 |
| Andrew David Associates (Holdings) Limited | Financial services | 2020 |
| Andrew Hartop Financial Planning Ltd | Professional & scientific | 2006 |
| Andrew Watson Consultancy Ltd | Professional & scientific | 2024 |
| Andrewkiff Ltd | Professional & scientific | 2026 |
| Andrews Electrical & Building Services Ltd | Construction | 2010 |
| ANDROMEDA7 Ltd | Wholesale & retail | 2025 |
| Andy P Limited | Construction | 2010 |
| Anemos Books Ltd | Information & communication | 2018 |
| Anfa Chemical HZ Co Ltd | Manufacturing | 2025 |
| Angel Analytics and Research Limited | Information & communication | 2016 |
| Angel Buildings Limited | Real estate | 2022 |
| Angela Gore Ltd | Wholesale & retail | 2022 |
| Angela Nabbale Coaching Company Limited | Professional & scientific | 2023 |
| Anglo American OIL Company Limited | Wholesale & retail | 1999 |
| Anglo Property Group Ltd | Real estate | 2023 |
| Anglo ST James Limited | Real estate | 2001 |
| Angus Egress Ltd | Financial services | 2023 |
| ANH Care Homes Ltd | Health & social care | 2024 |
| ANI SAM Health Care Limited | Health & social care | 2015 |
| Anima EX Machina Ltd | Information & communication | 2015 |
| Anima Limited | Information & communication | 2020 |
| Animal-It Limited | Information & communication | 2018 |
| Animals Asia Foundation | Other services | 2001 |
| Anisah Dost Ltd | Wholesale & retail | 2025 |
| Anjobar Ltd | Administrative & support | 2017 |
| Ankanova Ltd | Information & communication | 2026 |
| Anmar Pharmaceutical and Food Services Ltd | Manufacturing | 2025 |
| Anna Home Care Ltd | Health & social care | 2018 |
| Anna Knight Associates Limited | Professional & scientific | 2021 |
| Anna Marsh Limited | Health & social care | 2024 |
| Anna Szczech Ltd | Other services | 2024 |
| Annainvest Limited | Financial services | 2011 |
| Anne-Marie Fast Coaching Limited | Professional & scientific | 2017 |
| Anode Cathode Limited | Wholesale & retail | 2020 |
| Anonym Ltd | Professional & scientific | 2026 |
| Anquet Technology Ltd | Information & communication | 2001 |
| ANS Engineering Limited | Professional & scientific | 2025 |
| ANT Composites Limited | Manufacturing | 2026 |
| Anta R (Dorset) Ltd | Health & social care | 2019 |
| Antec Limited | Other services | 1998 |
| Antepli Pennhill Ltd | Hospitality | 2025 |
| Anthonys Estate Agents Limited | Real estate | 2011 |
| Anto Drive Ltd | Manufacturing | 2025 |
| Anton Burmistrov Limited | Professional & scientific | 2019 |
| Antonio Caruso D Ltd | Wholesale & retail | 2025 |
| Antonio Caruso Distro Ltd | Wholesale & retail | 2024 |
| Antry Pools Ltd | Construction | 2026 |
| Anura Consulting Ltd | Other services | 2010 |
| Anwen Co Ltd | Health & social care | 2008 |
| Anyservice VIP Limited | Health & social care | 2024 |