| Almis UK Limited | Administrative & support | 2006 |
| Alnawas Limited | Manufacturing | 2012 |
| Alnoor Estates Ltd | Real estate | 2022 |
| Alnuaimi Limited | Wholesale & retail | 2022 |
| Aloha Africa Ltd | Wholesale & retail | 2020 |
| Alokati Limited | Health & social care | 2024 |
| Along Retail Ltd | Wholesale & retail | 2025 |
| Alonso Transport Ltd | Administrative & support | 2019 |
| Aloysius Grace Limited | Arts & recreation | 2021 |
| Alpasha Express Ltd | Hospitality | 2020 |
| Alperton (Wharfside) Management Company Limited | Administrative & support | 1999 |
| Alperton Academy Ltd | Wholesale & retail | 2023 |
| Alperton Community School | Education | 2012 |
| Alperton MOT Centre Ltd | Wholesale & retail | 2023 |
| Alperton Point Ltd | Wholesale & retail | 2019 |
| Alperton Rents Limited | Construction | 2018 |
| Alperton Stationary Shop Limited | Wholesale & retail | 2015 |
| Alperton Tutors Ltd | Education | 2025 |
| Alpha & Omega Gurukulam Ltd | Education | 2021 |
| Alpha Design and Construction Ltd | Construction | 2016 |
| Alpha Gospel Academy Ltd | Arts & recreation | 2026 |
| Alphine Limited | Manufacturing | 2025 |
| Alrajhi Holding Limited | Wholesale & retail | 2019 |
| Alramz Ltd | Wholesale & retail | 2023 |
| ALS Aspire Limited | Health & social care | 2016 |
| ALS Property Construction Ltd | Construction | 2021 |
| ALS Residential Ltd | Real estate | 2025 |
| Alsadda Limited | Wholesale & retail | 2020 |
| Alsafar Traveluk Ltd | Administrative & support | 2023 |
| Alsaqabi Real Estate Limited | Real estate | 2021 |
| Altair Science Limited | Professional & scientific | 2023 |
| Alterego Technology Ltd | Information & communication | 2019 |
| Altriel Ltd | Information & communication | 2026 |
| Altris UK Limited | Information & communication | 2023 |
| Altum Consulting Ltd | Real estate | 2024 |
| Alvarium Group CIC | Education | 2023 |
| Alya Cars Ltd | Wholesale & retail | 2018 |
| AM Lifts Installation Ltd | Construction | 2020 |
| AM London Services Ltd | Construction | 2023 |
| AM Retail Store Ltd | Wholesale & retail | 2025 |
| AM Stays Ltd | Real estate | 2022 |
| Am&D Transport Limited | Wholesale & retail | 2023 |
| AM24 Hire Ltd | Administrative & support | 2024 |
| Amaj Associates Ltd | Real estate | 2025 |
| Amajar Ltd | Construction | 2017 |
| Amaliyah Events Ltd | Administrative & support | 2026 |
| Aman Catering Limited | Hospitality | 2025 |
| Amantien Electrical Services Ltd | Energy | 2015 |
| Amara Health Limited | Wholesale & retail | 2026 |
| Amara INT Ltd | Hospitality | 2023 |
| Amarshiv Ltd | Hospitality | 2024 |
| Amax Solutions Limited | Professional & scientific | 2015 |
| Ambar Fisheries LP | | 2011 |
| Ambe Distributors Ltd | Transport & logistics | 2024 |
| Ambe Global Ltd | Transport & logistics | 2025 |
| Amber Accounts Ltd | Professional & scientific | 2022 |
| Ambient Devotion Ltd | Information & communication | 2016 |
| Ambika Stores Limited | Wholesale & retail | 2025 |
| Ambleside Management Services Ltd | Hospitality | 2025 |
| Ambs Design Ltd | Construction | 2023 |
| AMC Legal Services Limited | Real estate | 2016 |
| Amchan.Tuina Ltd | Other services | 2025 |
| AMCKC0 Limited | Arts & recreation | 2005 |
| AMD Accountants Ltd | Professional & scientific | 2012 |
| Ame's Brain Ltd | Professional & scientific | 2025 |
| Amea Designs Ltd | Professional & scientific | 2019 |
| Amechi Limited | Administrative & support | 1997 |
| Amee Holdings Ltd | Financial services | 2021 |
| Ameen Remedies Ltd | Transport & logistics | 2022 |
| Ameer Hamza Ltd | Wholesale & retail | 2025 |
| Ameer Motors Ltd | Wholesale & retail | 2025 |
| American Brothers Limited | Construction | 2019 |
| Amey Kamp LLP | | 2008 |
| AMG Logistics Ltd | Transport & logistics | 2025 |
| Amigo Base Ltd | Real estate | 2022 |
| Amigos Stone Ltd | Manufacturing | 2023 |
| Amii Construct Ltd | Construction | 2025 |
| Aminaka Properties Limited | Real estate | 2021 |
| Amir London Traders Limited | Wholesale & retail | 2026 |
| Amirali Property Management Ltd | Real estate | 2022 |
| Amirson Limited | Real estate | 2025 |
| Amity Dental Wellness Limited | Real estate | 2025 |
| AMK (UK) Private Ltd | Real estate | 2026 |
| AMM Consult Ltd | Professional & scientific | 2025 |
| Amof Limited | Hospitality | 2019 |
| AMP7 Limited | Real estate | 2022 |
| Ampere Technologies Ltd | Professional & scientific | 2025 |
| Ampersandmin Ltd | Information & communication | 2017 |
| Ampetco Ltd | Administrative & support | 2025 |
| Amplius Ventures Ltd | Wholesale & retail | 2025 |
| Amra Development U.K. Limited | Real estate | 2022 |
| Amra Properties U.K. Limited | Real estate | 2018 |
| Amra Residentials U.K. Limited | Real estate | 2022 |
| AMS Cars Ltd | Wholesale & retail | 2024 |
| AMS Fleet Services Ltd | Transport & logistics | 2024 |
| Amsm Properties Limited | Real estate | 2020 |
| AMY Assets Ltd | Real estate | 2025 |
| An-Nisa Society | Education | 2006 |
| ANA Montes Consultancy Limited | Health & social care | 2023 |
| Anaavrin Ltd | Wholesale & retail | 2024 |