| Ambition of Avtar Ltd | Education | 2022 |
| Ambitious Hospitality Solutions Ltd | Administrative & support | 2024 |
| Ambrya Staffing Solutions Ltd | Administrative & support | 2026 |
| AMD Nexus Ltd | Wholesale & retail | 2023 |
| Amdap Limited | Information & communication | 2013 |
| Amdee Ltd | Professional & scientific | 2021 |
| Amdf Services Ltd | Real estate | 2020 |
| American Sweetshop Ltd | Wholesale & retail | 2025 |
| Americano Fusion Limited | Other services | 2012 |
| Americano Indian Fusion Ltd | Hospitality | 2025 |
| Americano ME3 Ltd | Hospitality | 2025 |
| Americano UK Caterers Limited | Hospitality | 2024 |
| Amethysta Design House Limited | Wholesale & retail | 2017 |
| Amharj Ltd | Wholesale & retail | 2020 |
| Amigo Logistics UK Ltd | Transport & logistics | 2022 |
| Amigos Bar Services Limited | Hospitality | 2022 |
| Amigos Nite Limited | Hospitality | 2020 |
| Amigos UK Events Limited | Administrative & support | 2024 |
| Amina Traders London Ltd | Administrative & support | 2023 |
| Amir Freight Limited | Transport & logistics | 2014 |
| Amit Kapor Ltd | Construction | 2020 |
| Amity Tutors Ltd | Education | 2018 |
| AMJ Legal Conveyancing Ltd | Professional & scientific | 2025 |
| AMJ Legal Solicitors Limited | Professional & scientific | 2019 |
| Amjivrental Ltd | Real estate | 2026 |
| AMM Traders Ltd | Wholesale & retail | 2021 |
| Ammachi Express Ltd | Hospitality | 2024 |
| Amms Pro Limited | Professional & scientific | 2025 |
| Ammu Property Ltd | Real estate | 2026 |
| Amnk Ltd | Wholesale & retail | 2026 |
| Amoghavarsha Properties Ltd | Real estate | 2025 |
| Amora by Amritha Ltd | Hospitality | 2025 |
| Amorel London Ltd | Manufacturing | 2025 |
| Amplify Solutions Limited | Wholesale & retail | 2023 |
| AMR Creation Limited | Information & communication | 2026 |
| Amrit Sweets Limited | Hospitality | 2020 |
| Amrita Beautycare Ltd | Other services | 2022 |
| Amritpal Mandahar Ltd | Construction | 2025 |
| Amron Investments Ltd | Real estate | 2019 |
| AMS Couriers Limited | Transport & logistics | 2020 |
| Amsa Trading Ltd | Wholesale & retail | 2018 |
| AMTRI25 Ltd | Wholesale & retail | 2025 |
| AMY Info Solutions Ltd | Administrative & support | 2016 |
| AMY Louisa Ltd | Professional & scientific | 2016 |
| AMY Versatile Limited | Wholesale & retail | 2025 |
| Amyrine Ltd | Real estate | 2024 |
| Amzin Limited | Information & communication | 2023 |
| Améir Allure Ltd | Wholesale & retail | 2025 |
| AN FM Ltd | Wholesale & retail | 2026 |
| AN Investment Property Limited | Real estate | 2024 |
| AN KAI Collective Ltd | Wholesale & retail | 2026 |
| ANA Impex Ltd | Transport & logistics | 2026 |
| Anaahat Group Ltd | Transport & logistics | 2019 |
| Analytictech Ltd | Information & communication | 2025 |
| Anant GIL Transport Ltd | Transport & logistics | 2026 |
| Ananta Consultancy Limited | Information & communication | 2013 |
| Anaroma Modern House Ltd | Real estate | 2024 |
| Anasol Consulting Limited | Professional & scientific | 2025 |
| Anaya Real Estates Ltd | Real estate | 2023 |
| ANB Distributions Retail Limited | Wholesale & retail | 2025 |
| ANC IT Limited | Information & communication | 2015 |
| Ancho Anchev Limited | Transport & logistics | 2013 |
| Anchor - the Counselling Practice | Health & social care | 2005 |
| Anderson & Sons Estates Ltd | Health & social care | 2019 |
| Andrees Utilities Ltd | Construction | 2025 |
| Andres Trucks Ltd | Transport & logistics | 2023 |
| Andrew Forman Ltd | Construction | 2025 |
| ANE Management Ltd | Professional & scientific | 2016 |
| Aneerahs Ltd | Real estate | 2018 |
| Anerley Foods Ltd | Wholesale & retail | 2025 |
| Angad Investments Limited | Real estate | 2024 |
| Angat Kamboh Property Limited | Real estate | 2024 |
| Angel Gate Management Company Limited | Real estate | 1988 |
| Angel NAV Ltd | Wholesale & retail | 2026 |
| Angelfield Investments Ltd | Real estate | 2025 |
| Angelfx Investment Group (UK) Ltd | Financial services | 2020 |
| Angelic Health Limited | Health & social care | 2020 |
| Angie's Tiny Treats Ltd | Manufacturing | 2026 |
| Angix Ltd | Wholesale & retail | 2021 |
| Angle Construction Limited | Construction | 2022 |
| Anglicus Edifice Limited | Real estate | 2024 |
| Anidil Consulting Limited | Professional & scientific | 2019 |
| Aniis Ltd | Administrative & support | 2017 |
| Animal Aircare Company Limited | Transport & logistics | 2002 |
| Animationlabpresents Ltd | Information & communication | 2023 |
| Anin Autos Ltd | Wholesale & retail | 2020 |
| Anirental Ltd | Transport & logistics | 2018 |
| Anisan Apparels Ltd | Wholesale & retail | 2017 |
| Anita Impex (Apple) Limited | Wholesale & retail | 2025 |
| Anita Impex (Burnsway) Limited | Real estate | 2023 |
| Anita Impex (Holloway) Limited | Real estate | 2022 |
| Anita Impex (Hounslow) Limited | Professional & scientific | 2009 |
| Anita Impex (Orpington) Limited | Real estate | 2023 |
| Anita Impex (ROM) Limited | Real estate | 2024 |
| Anita Impex (Trinity) Limited | Real estate | 2022 |
| Anjanova Ltd | Wholesale & retail | 2026 |
| Anjura Technologies Limited | Information & communication | 2017 |
| Ankvij Limited | Information & communication | 2025 |
| Anme Professional Services Ltd | Professional & scientific | 2013 |
| Anna Food & Wine Ltd | Wholesale & retail | 2022 |