| ALI Rizvi & Co. Limited | Professional & scientific | 2026 |
| Alisha Trading Limited | Transport & logistics | 2025 |
| ALL Aspect Solution Ltd | Construction | 2014 |
| ALL Skin Solutions Limited | Other services | 2024 |
| ALL Things Gassed Ltd | Information & communication | 2019 |
| ALL Work Training Ltd | Arts & recreation | 2023 |
| Allen Lyman Office Equipment Limited | Wholesale & retail | 1976 |
| Alliance Tradelink Ltd | Financial services | 2020 |
| Allied Children Centre Ltd | Health & social care | 2022 |
| Allied Construction Limited | Construction | 2025 |
| Allish Limited | Wholesale & retail | 2023 |
| Allsaints Convenience Store Ltd | Real estate | 2019 |
| Allure Business Ltd | Other services | 2018 |
| Allwyn Electrical Limited | Construction | 2020 |
| Allwyn Electrical Service Limited | Construction | 2025 |
| Almantas Ltd | Transport & logistics | 2016 |
| Almatni Electric and General Maintenance Services Ltd | Manufacturing | 2020 |
| Almisk Limited | Administrative & support | 2025 |
| Alora Forecourt Limited | Wholesale & retail | 2023 |
| Alpha Chauffeuring Limited | Transport & logistics | 2019 |
| Alpha Chem PR Limited | Wholesale & retail | 2025 |
| Alpha Organic Ltd | Wholesale & retail | 2025 |
| Alpha Residential Services Ltd | Health & social care | 2016 |
| Alpha UK Logistics Limited | Transport & logistics | 2025 |
| Alphapeak Ltd | Construction | 2018 |
| Alsouri Ltd | Wholesale & retail | 2021 |
| Altimus Footcare Limited | Health & social care | 2015 |
| Altimus Retailers Limited | Wholesale & retail | 2015 |
| Altur Ltd | Wholesale & retail | 2025 |
| Alvika Ltd | Transport & logistics | 2021 |
| Alwuduh Alathir Limited | Wholesale & retail | 2025 |
| AM A-Z Electrical Service Ltd | Construction | 2024 |
| AM Kargah UK Limited | Wholesale & retail | 2025 |
| AM Transport Consultancy Ltd | Professional & scientific | 2026 |
| AM2PM Plumbing & Heating Limited | Construction | 2017 |
| Amanu Limited | Transport & logistics | 2011 |
| Amar Logistics Transport Ltd | Transport & logistics | 2025 |
| Amar Logistics Transport Ltd 16852672 Limited | Transport & logistics | 2025 |
| Ambar Enterprise Ltd | Wholesale & retail | 2017 |
| Amber Cleaning Team Ltd | Administrative & support | 2024 |
| Ambotik Ltd | Hospitality | 2013 |
| AMG Properties London Ltd | Real estate | 2024 |
| Amin Northolt Ltd | Hospitality | 2025 |
| AMK RX Ltd | Public administration | 2022 |
| AML Compliance & Regulatory Experts Ltd | Professional & scientific | 2021 |
| AMM London Ltd | Administrative & support | 2020 |
| Amma Civil & Structural Engineering PVT Limited | Construction | 2007 |
| Amoylan Ltd | Information & communication | 2024 |
| AMP997 Services Ltd | Construction | 2025 |
| AMS Construction London Ltd | Construction | 2019 |
| Amy&H Property Managment Ltd | Households | 2026 |
| Amzrtlgroup Ltd | Wholesale & retail | 2025 |
| AN Frame Pictures Limited | Information & communication | 2017 |
| Analytics & Insights Ltd | Information & communication | 2022 |
| Ananyan Cafe Ltd | Hospitality | 2024 |
| Andrew and Simon Ltd | Real estate | 2022 |
| Andrew K Ltd | Wholesale & retail | 2022 |
| Anissa Footwear Ltd | Wholesale & retail | 2024 |
| Anjali Dhawan Private Limited | Real estate | 2025 |
| Anna Davydova Dance School Ltd | Education | 2004 |
| Annapurna Botanicals Ltd | Manufacturing | 2026 |
| Ansa Global Limited | Administrative & support | 2015 |
| Ansty Cross Service Station Ltd | Wholesale & retail | 2021 |
| Antiques & Jewels by K.G Ltd | Wholesale & retail | 2025 |
| Anuoluwa Property Ltd | Households | 2025 |
| AO Scaffolding Ltd | Construction | 2026 |
| AP Hospitality Ltd | Professional & scientific | 2025 |
| AP London Ltd | Wholesale & retail | 2023 |
| Apex Sales Consultancy Limited | Professional & scientific | 2016 |
| Apexsolve Ltd | Information & communication | 2025 |
| Apollo Hand Car Wash Ltd | Administrative & support | 2024 |
| Apollo SD LUX Limited | Wholesale & retail | 2026 |
| AQ Arts CIC | Education | 2017 |
| Aqeeq Haraz Bunn Ltd | Wholesale & retail | 2022 |
| AR Food & Wine Retail Ltd | Wholesale & retail | 2024 |
| AR Investments & Lettings Ltd | Real estate | 2025 |
| Araliya (PVT) Ltd | Information & communication | 2014 |
| Aram Al-Mutqadma for Real Estate Development & Investment Limited | Real estate | 2025 |
| Arangam Ltd | Real estate | 2016 |
| Arbab Group Ltd | Manufacturing | 2020 |
| Arcadian Estates Limited | Real estate | 2023 |
| Arch Lane Property Limited | Real estate | 2022 |
| Arka Office Services Ltd. | Other services | 2011 |
| Arkitekt Home Improvement Ltd | Construction | 2020 |
| Arks Specialist Ltd | Professional & scientific | 2024 |
| Armanisu Limited | Wholesale & retail | 2021 |
| Arms "U" Limited | Real estate | 2025 |
| Armughan Memorial Welfare Limited | Health & social care | 2025 |
| ARN53 Ltd | Wholesale & retail | 2025 |
| Arove Ltd | Transport & logistics | 2019 |
| ARS Goods Limited | Wholesale & retail | 2025 |
| Arsh Foundation | Education | 2017 |
| Art Ceramics Ltd | Construction | 2023 |
| Art Creation Advertising Ltd | Professional & scientific | 2016 |
| Art Fitters Ltd | Construction | 2018 |
| Arta Atelier Ltd | Construction | 2024 |
| Artisan Constructors Limited | Construction | 2025 |
| Arts Properties Ltd | Real estate | 2022 |
| Artt Scope UK Ltd | Real estate | 2023 |
| Arttom Build Ltd | Construction | 2019 |