| Arnao Limited | Professional & scientific | 2008 |
| Arriendo Ltd | Real estate | 2023 |
| Art & Jewels Consulting Ltd | Other services | 2004 |
| Art Vasu Limited | Construction | 2026 |
| Artem Plumbing and Heating Ltd | Construction | 2022 |
| Artisan Maintenance Services Ltd | Administrative & support | 2025 |
| Artists and Company Limited | Information & communication | 2012 |
| Arto London Ltd | Financial services | 2020 |
| Arvi Construction Ltd | Construction | 2007 |
| Asci Technology Ltd | Professional & scientific | 2020 |
| Ascot Classics Ltd | Wholesale & retail | 2023 |
| ASH & Bay Group Limited | Real estate | 2026 |
| Ashford Barbers Ltd | Other services | 2019 |
| Ashford Media Ltd | Professional & scientific | 2025 |
| Ashley George & Co.,Limited | Construction | 1947 |
| Ashton School Limited | Education | 2016 |
| Ashview Gardens Management Company Limited | Households | 2020 |
| Asiaali Limited | Real estate | 2026 |
| Asianic Logistics Ltd | Transport & logistics | 2023 |
| Asif N Sadaf Ltd | Professional & scientific | 2022 |
| Asma's Kitchen Ltd | Hospitality | 2024 |
| Aspen Estate Agents Ltd | Real estate | 2008 |
| Aspen Medical Clinics Ltd | Health & social care | 2026 |
| Aspexx Digital Ltd | Administrative & support | 2021 |
| Asri Advanced Studies and Research Initiative Ltd | Financial services | 2020 |
| Aston Keeper Ltd | Wholesale & retail | 2023 |
| Aston White Limited | Construction | 2022 |
| Astrea London Limited | Wholesale & retail | 2023 |
| Ata.One Ltd. | Transport & logistics | 2015 |
| Atlantic Ocean Design Ltd | Financial services | 2018 |
| Atworldinvest Ltd | Real estate | 2014 |
| Aubrey Design and Plumb Ltd | Construction | 2020 |
| Audley BW Midco Limited | Households | 2024 |
| Audley Chalfont Management Limited | Real estate | 2013 |
| Audley Clevedon Limited | Real estate | 2005 |
| Audley Clevedon Management Limited | Real estate | 2007 |
| Audley Cobham Management Limited | Other services | 2020 |
| Audley Cobham Rent Company Limited | Other services | 2020 |
| Audley Cobham Unit Co NO1 Limited | Households | 2025 |
| Audley Cobham Unit Co NO2 Limited | Households | 2025 |
| Audley Ellerslie Unitco Limited | Households | 2024 |
| Audley Group Limited | Financial services | 2015 |
| Audley Headley Court Management Limited | Households | 2023 |
| Audley Headley Court Rent Company Limited | Households | 2023 |
| Audley Holdco NO.1 Limited | Households | 2023 |
| Audley Holdco NO.2 Limited | Households | 2024 |
| Audley Holdco NO.3 Limited | Households | 2025 |
| Audley Investments NO 1 Limited | Other services | 2019 |
| Audley Investments NO 2 Limited | Other services | 2019 |
| Audley Lingfield Grange Limited | Households | 2024 |
| Audley Shiplake Management Limited | Households | 2024 |
| Audley Shiplake Meadows Limited | Households | 2024 |
| Audley Stanbridge Earls Rent Company Limited | Households | 2019 |
| Audley Stanbridge Earls Unitco Limited | Households | 2024 |
| Audley Sunningdale Unitco 1 Limited | Households | 2025 |
| Audley Sunningdale Unitco 2 Limited | Households | 2025 |
| Audley Wycliffe Management Limited | Real estate | 2019 |
| Aura Electrical 247 Limited | Construction | 2022 |
| Aurevon Ltd | Other services | 2025 |
| Auto Glass York Limited | Extraterritorial | 2011 |
| Autoglass (UK) Limited | Extraterritorial | 2011 |
| Autoglass Bodyrepair Limited | Extraterritorial | 1986 |
| Autoglass Distribution Limited | Extraterritorial | 1987 |
| Autoglass Windshields Limited | Extraterritorial | 2011 |
| Automatic Business Limited | Information & communication | 2011 |
| Automatic Line Equipment Limited | | 1982 |
| Autostrata.Ai Ltd | Information & communication | 2025 |
| Autotrak Ltd | Construction | 2023 |
| Auxilium Properties Limited | Real estate | 2020 |
| Auxilium Rental Properties Limited | Real estate | 2020 |
| AV2004 Limited | Wholesale & retail | 2004 |
| Avand Ltd | Professional & scientific | 2025 |
| Avantgarde Build & Refurbishment Ltd | Construction | 2025 |
| Avaro Projects Limited | Professional & scientific | 2025 |
| AVC London Ltd | Other services | 2017 |
| Aviora Capital Ltd | Real estate | 2026 |
| Avity Limited | Information & communication | 2014 |
| Avon Foods Limited | Hospitality | 2020 |
| Avondale Quality Consulting Ltd | Professional & scientific | 2025 |
| AVP Property and Holdings Ltd | Real estate | 2025 |
| Axten Holdings Ltd | Construction | 2024 |
| Ayexom Ltd | Professional & scientific | 2025 |
| Azeem ZIA Ltd | Wholesale & retail | 2025 |
| Azure Fenix Ltd | Other services | 2024 |
| Azure Lotus Limited | Professional & scientific | 2024 |
| AZY Autos Limited | Administrative & support | 2016 |
| B & P Real Estate Ltd. | Real estate | 2019 |
| B M Patel Limited | Real estate | 2022 |
| B&R Assets Ltd | Real estate | 2023 |
| B&W Invest Limited | Real estate | 2021 |
| B&W Synergy Ltd | Real estate | 2025 |
| B.Bill & Sons Limited | Wholesale & retail | 2011 |
| BA Foundation Limited | Professional & scientific | 2023 |
| Babel Sync Ltd | Information & communication | 2024 |
| Back on the Road (Botr) Auto Locksmith Ltd | Wholesale & retail | 2026 |
| BACK2LIFEPROJECTUK C.I.C. | Administrative & support | 2023 |
| Bahn Utopia Ltd | Real estate | 2020 |
| Baker & Baker Consulting Group Ltd | Professional & scientific | 2019 |
| Baker's Yard Services Limited | Real estate | 2017 |
| Balkanik Automotive Ltd | Wholesale & retail | 2026 |