| AJ Private Management Company Ltd | Professional & scientific | 2017 |
| Ajar Energy Solutions Ltd | Energy | 2025 |
| AJB Informatics Limited | Information & communication | 2014 |
| AJL Mayfair Ltd | Professional & scientific | 2025 |
| Ajmctavish Communications Ltd | Professional & scientific | 2023 |
| AJS Design & Consultancy Limited | Construction | 2015 |
| AK Electrical Connect Ltd | Construction | 2024 |
| Akal Brokers Ltd | Financial services | 2025 |
| Akatsuki Publishing Ltd | Wholesale & retail | 2021 |
| Akeo Investments Ltd | Financial services | 2021 |
| Akess Limited | Administrative & support | 2003 |
| Akoh Limited | Information & communication | 2026 |
| AKR Estates Limited | Real estate | 2014 |
| AL Jinaan Limited | Education | 2026 |
| AL Mustafa Welfare Trust International Ltd | Health & social care | 2005 |
| Al-Mada'In Group Ltd. | Households | 2024 |
| Alanselfpublishing Ltd | Wholesale & retail | 2021 |
| Alara ROW Ltd | Manufacturing | 2025 |
| Albany Research Ltd | Professional & scientific | 2022 |
| Albitom Services Limited | Health & social care | 2021 |
| Alca Consultancy Ltd | Construction | 2021 |
| Alder Applications Limited | Information & communication | 2018 |
| Aleeha Foods Limited | Wholesale & retail | 2020 |
| Aletheia Capital Ltd | Wholesale & retail | 2025 |
| Alexanderus Tech Ltd. | Information & communication | 2017 |
| Alfonso Bertotti Limited | Real estate | 2024 |
| Algo Lambda Ltd | Information & communication | 2019 |
| Alisha Godinho Ltd | Health & social care | 2018 |
| Alisha PK Limited | Real estate | 2026 |
| ALL About ME Day Nursery Ltd | Education | 2015 |
| ALL Events Crew Limited | Administrative & support | 2015 |
| ALL Seasons Flowers Limited | Wholesale & retail | 1997 |
| Allada Consultancy Limited | Information & communication | 2018 |
| Allgo Cargo Ltd | Transport & logistics | 2023 |
| Allgrey Gallery Ltd | Wholesale & retail | 2026 |
| Alloy Refurbz West London Ltd | Wholesale & retail | 2026 |
| Almajdcars Ltd | Wholesale & retail | 2019 |
| Almanico Limited | Arts & recreation | 1999 |
| Aloha Publishing Ltd | Wholesale & retail | 2019 |
| Alpha Home Assist Limited | Other services | 2013 |
| Alpha NET IT Limited | Information & communication | 2024 |
| Alphanove Consultancy Ltd | Information & communication | 2022 |
| Alphanove Property Ltd | Real estate | 2022 |
| Alsec Fire and Security Ltd | Administrative & support | 2025 |
| Alto Worldwide Ltd | Wholesale & retail | 2019 |
| Alveenamart Ltd | Wholesale & retail | 2025 |
| AM Despatch Limited | Transport & logistics | 2013 |
| AM Kazmi Ltd | Wholesale & retail | 2025 |
| AM Properties Services Ltd | Real estate | 2024 |
| Amao Business Services Limited | Information & communication | 2018 |
| Amar M&J Holding Limited | Financial services | 2020 |
| Amara Vita Ltd | Wholesale & retail | 2024 |
| Amathya Properties Limited | Real estate | 2017 |
| Amazing Meal Ltd | Hospitality | 2025 |
| Ambient Film Services Ltd | Information & communication | 2025 |
| Ambitioned Ltd | Professional & scientific | 2023 |
| Amdrodd Technologies Limited | Information & communication | 2024 |
| Amile Studios Ltd | Administrative & support | 2023 |
| AMN Medical Ltd | Health & social care | 2019 |
| AMR Telecom Limited | Manufacturing | 2016 |
| Amreen Properties Ltd | Real estate | 2025 |
| AMS (PRS Specialist) Limited | Information & communication | 2016 |
| AMS Motors Limited | Wholesale & retail | 2011 |
| AN Aircon Ltd | Energy | 2023 |
| AN Creative Limited | Administrative & support | 2019 |
| ANA Consultancy Services Limited | Wholesale & retail | 2017 |
| ANA Verdun London Limited | Professional & scientific | 2022 |
| Anabasis Solutions Ltd | Wholesale & retail | 2013 |
| Anasudan CIC | Information & communication | 2021 |
| Anavadya Limited | Professional & scientific | 2022 |
| ANB Property Investments Ltd | Real estate | 2021 |
| Anco Ltd | Manufacturing | 2024 |
| Andarma Metals & Mining Partners Ltd | Professional & scientific | 2026 |
| Anderson Jones Property Management Ltd | Real estate | 2020 |
| Andrews & Munday Developments Ltd | Real estate | 2020 |
| Andrews & Munday Holdings Ltd | Real estate | 2020 |
| Andrews 1990 Investments Limited | Real estate | 2021 |
| Angel EYE Independent Living Ltd | Hospitality | 2025 |
| Angels in Darkness Limited | Information & communication | 2025 |
| Anita Sharma Property Investment Limited | Real estate | 2017 |
| Anna Morrison Design Limited | Arts & recreation | 2022 |
| Anna Paola Limited | Wholesale & retail | 2010 |
| ANS Music and Entertainment Development Investment Limited | Information & communication | 2025 |
| Ansarey International Limited | Administrative & support | 2015 |
| Ant-Trans Ltd | Transport & logistics | 2017 |
| Anuhazi TW8 Ltd | Hospitality | 2024 |
| Anwen Cosmetics Ltd | Wholesale & retail | 2026 |
| Anything & Everything Online Ltd | Real estate | 2020 |
| AP Benson Ltd. | Information & communication | 2001 |
| AP Bristol Limited | Construction | 2019 |
| AP Bristol Number 1 Limited | Hospitality | 2019 |
| AP Bristol Number 2 Limited | Hospitality | 2019 |
| AP Bristol Number 3 Limited | Hospitality | 2019 |
| AP Bristol Number 4 Limited | Hospitality | 2019 |
| AP Euston Hotels Holdings Limited | Hospitality | 2019 |
| AP Euston Hotels Ltd | Hospitality | 2019 |
| AP Euston Hotels Number 1 Limited | Hospitality | 2019 |
| AP Euston Hotels Number 2 Limited | Hospitality | 2019 |
| AP Hotel Holdings Limited | Hospitality | 2020 |
| AP Mobile Mechanic Ltd | Wholesale & retail | 2025 |