| Amatex Ltd | Construction | 2011 |
| Amaya Mila Ltd | Hospitality | 2021 |
| Ambassador Travels Limited | Transport & logistics | 2022 |
| Amberfile Ltd | Administrative & support | 1998 |
| Amberpath Ltd | Education | 2025 |
| Ambers UK Properties Limited | Real estate | 2025 |
| Ambient Green Ltd | Construction | 2011 |
| Ambleside Management Company Limited | Real estate | 1980 |
| Amcom International Limited | Wholesale & retail | 2020 |
| Amcom Properties Ltd | Real estate | 2021 |
| AMD Autohaus Ltd | Wholesale & retail | 2024 |
| AMD Car Hire Ltd | Administrative & support | 2025 |
| Ameena Sulthana UK Limited | Professional & scientific | 2026 |
| Ameeri Services Ltd | Administrative & support | 2022 |
| Amersham Road Management Limited | Households | 2012 |
| Amhurst Gardens Ltd | Real estate | 2025 |
| Amin Motors Ltd | Wholesale & retail | 2017 |
| Amir & Co Capital Partners Limited | Financial services | 2026 |
| Amirah Noor Limited | Wholesale & retail | 2025 |
| Amitoj Construction Ltd | Construction | 2026 |
| Ammal Solicitors Ltd | Professional & scientific | 2017 |
| Ammoz Ltd | Administrative & support | 2019 |
| AMN Uxbridge Ltd | Professional & scientific | 2018 |
| Amoka Limited | Real estate | 2023 |
| Amou Limited | Wholesale & retail | 2012 |
| Amoud Ltd | Wholesale & retail | 2018 |
| Ampy Denham Ltd | Professional & scientific | 2025 |
| Amra Group Ltd | Real estate | 2021 |
| AMREEN10 Ltd | Wholesale & retail | 2024 |
| Amrutha UK Limited | Wholesale & retail | 2020 |
| AMS Cavaliere Ltd | Real estate | 2024 |
| Amsha Limited | Information & communication | 2013 |
| Amsk Property Investment Ltd | Real estate | 2021 |
| Amway Airport Transfer Ltd | Transport & logistics | 2025 |
| AMZ Chain Solutions Limited | Professional & scientific | 2021 |
| ANA Advertisement Ltd | Manufacturing | 2026 |
| Anaahat Transport Limited | Transport & logistics | 2026 |
| Anaaya Impex Limited | Other services | 2012 |
| Anahat Catering Ltd | Hospitality | 2026 |
| Analytix Certified Accountancy & Advisory Ltd | Professional & scientific | 2021 |
| Anamma Ltd | Wholesale & retail | 2026 |
| Anand Financial Architecture Ltd | Financial services | 2017 |
| Anand Wills & Trusts Ltd | Other services | 2018 |
| Ananta Impex Limited | Wholesale & retail | 2024 |
| Anaya Infotech Solutions Ltd | Information & communication | 2022 |
| ANC Premium Services Limited | Professional & scientific | 2017 |
| ANC Propco Limited | Real estate | 2024 |
| Ancona Enterprise Ltd | Wholesale & retail | 2022 |
| AND Consultants Limited | Professional & scientific | 2016 |
| AND Lights Ltd | Construction | 2023 |
| Anderson Management Services Limited | Real estate | 2007 |
| Anderson Plumbing Solutions Ltd | Construction | 2025 |
| Andrius Limited | Construction | 2011 |
| Androon Arcade Consultancy Limited | Professional & scientific | 2024 |
| Anewlifeuk Limited | Administrative & support | 2018 |
| Angels Shelter Ltd | Health & social care | 2025 |
| Anglian Renewables Ltd | Construction | 2019 |
| Anglo Cargo Express Limited | Transport & logistics | 1989 |
| Anglo Persian Carpet Co.(London)Limited | Professional & scientific | 1939 |
| Angrej Construction Ltd | Construction | 2018 |
| Angus Construction Ltd | Construction | 2011 |
| Anikanikhil Limited | Real estate | 2017 |
| Anikas Indian Takeaway Ltd | Hospitality | 2019 |
| Anike Services Ltd | Information & communication | 2021 |
| Animals & Birds Limited | Arts & recreation | 2024 |
| Anita Properties Limited | Real estate | 2021 |
| Anita's Coffee Lounge Ltd | Hospitality | 2021 |
| Anjaneya Healthcare Ltd | Health & social care | 2024 |
| Ankit Ltd | Transport & logistics | 2017 |
| Ankur Precision Engineering Ltd | Manufacturing | 1998 |
| Anmk Properties Ltd | Real estate | 2019 |
| Anna Gieniusz Ltd | Manufacturing | 2018 |
| Anna Kennedy Limited | Health & social care | 2009 |
| Annabel Clark Enterprises Ltd | Professional & scientific | 2017 |
| Annexxe Limited | Construction | 2021 |
| Annogo Ltd | Wholesale & retail | 2023 |
| Annurjun Properties Ltd | Real estate | 2018 |
| ANO Comms Ltd | Construction | 2023 |
| Anoj Accountancy Ltd | Professional & scientific | 2019 |
| Anomalous Productions Ltd | Information & communication | 2018 |
| Another Option Limited | Wholesale & retail | 2006 |
| Ansana Limited | Education | 2011 |
| Ansh Services Ltd | Real estate | 2022 |
| Ansh Trades Limited | Construction | 2026 |
| Ansora & Co Ltd | Construction | 2005 |
| Anstruther Realisations (SJW) Ltd | Administrative & support | 2017 |
| Antares Foods Limited | Other services | 2018 |
| Anthony Lewis Property Ltd | Real estate | 2025 |
| Antive Ltd | Information & communication | 2025 |
| Antomena Ltd | Health & social care | 2014 |
| Antonica Company Ltd | Construction | 2021 |
| Antonio Martins Ltd | Administrative & support | 2021 |
| Antonio Santos Gardening Ltd | Administrative & support | 2024 |
| Antoun, Ltd | Information & communication | 2015 |
| Anvayin Ltd | Information & communication | 2024 |
| Anved Enterprise Limited | Administrative & support | 2015 |
| ANW Clinicals Ltd | Health & social care | 2024 |
| Anworld Ltd | Wholesale & retail | 2016 |
| ANX Services Limited | Health & social care | 2025 |
| ANY Team Ltd | Administrative & support | 2016 |