| Armkor Ltd | Transport & logistics | 2006 |
| Armor Security Ltd | Administrative & support | 2023 |
| Armoured Pest Control Ltd | Administrative & support | 2025 |
| Armr Consultants Ltd | Information & communication | 2026 |
| Arnas UK Trading Ltd | Construction | 2006 |
| Arnav Property Management Limited | Real estate | 2021 |
| Arno Homes Ltd | Real estate | 2021 |
| Arnos Enterprises Ltd | Wholesale & retail | 2016 |
| ARO Automotive Ltd | Wholesale & retail | 2021 |
| Aroma Logistics Ltd | Transport & logistics | 2024 |
| Aromat Kuchni Ltd | Hospitality | 2012 |
| Arora Medical Group Limited | Other services | 2024 |
| Arora Real Estate Ltd | Real estate | 2022 |
| Arora Services Ltd | Transport & logistics | 2016 |
| Arora Skin Aesthetics Ltd | Other services | 2024 |
| Arora Venture Holdings Ltd | Information & communication | 2024 |
| Around Noon (London) Limited | Hospitality | 2006 |
| Arownex Consulting Ltd | Administrative & support | 2019 |
| Arran Way Limited | Real estate | 2024 |
| Arrow Embroidery Limited | Manufacturing | 2010 |
| Arrow Properties Limited | Real estate | 2010 |
| Arrows Car Restoration Ltd | Wholesale & retail | 2026 |
| ARS Builders Limited | Construction | 2018 |
| ARS Construction Services Limited | Construction | 2021 |
| ARS Renovations Ltd | Construction | 2026 |
| Arshad.Sons Limited | Wholesale & retail | 2025 |
| Arshia Solutions Ltd | Real estate | 2011 |
| Arshian Group Ltd | Wholesale & retail | 2026 |
| Arsho Ltd | Information & communication | 2015 |
| Arsho Properties Ltd | Real estate | 2018 |
| Arslan Group of Companies Ltd | Transport & logistics | 2025 |
| Art Building & Services Limited | Construction | 2013 |
| Art Classes Group Limited | Arts & recreation | 2016 |
| Artc Ltd | Professional & scientific | 2021 |
| Artedge Ltd | Construction | 2025 |
| Arteffectuk Ltd | Information & communication | 2026 |
| Artful Intelligence Ltd | Information & communication | 2025 |
| Artha Solutions Ltd | Information & communication | 2009 |
| Artha Ventures Limited | Financial services | 2021 |
| Arthur Adams Real Estate Limited | Real estate | 2025 |
| Arthur Grace Residential Limited | Real estate | 2019 |
| Arthurian Way Limited | Transport & logistics | 2026 |
| Arthy Technologies Limited | Information & communication | 2012 |
| Artistic Seva Ltd | Manufacturing | 2024 |
| Artrans Limited | Transport & logistics | 2021 |
| Artur Automation Solutions Ltd | Manufacturing | 2023 |
| Artus Logistics Ltd | Manufacturing | 2015 |
| Arvane Ltd | Wholesale & retail | 2024 |
| Arvi Staffing Ltd | Hospitality | 2024 |
| Arwane Ltd | Wholesale & retail | 2025 |
| ARX Projects Ltd | Manufacturing | 2025 |
| Aryaana Ltd | Wholesale & retail | 2023 |
| Aryalei Shop Limited | Wholesale & retail | 2026 |
| Aryan Consultancy Limited | Information & communication | 2022 |
| Aryan Property Management Ltd | Real estate | 2026 |
| Aryan Scaled ME Ltd | Professional & scientific | 2026 |
| Aryanriya Ltd | Wholesale & retail | 2025 |
| Aryaone Ltd | Wholesale & retail | 2026 |
| Aryuv Properties Ltd | Real estate | 2017 |
| Aryz Cardiac Solution Limited | Health & social care | 2015 |
| ARZ Transport Ltd | Transport & logistics | 2022 |
| Arzeen Limited | Real estate | 2016 |
| Arzum Limited | Construction | 2010 |
| AS & Sons Ltd | Real estate | 2005 |
| AS Bhatia Ltd | Transport & logistics | 2024 |
| AS Enterprises UK Limited | Wholesale & retail | 2008 |
| AS Exchange Limited | Real estate | 2019 |
| AS Nadeem Online Ltd | Information & communication | 2025 |
| AS Prime Limited | Professional & scientific | 2021 |
| AS Private Limited | Real estate | 2023 |
| AS Trans Services Ltd | Transport & logistics | 2018 |
| AS Turbo Motors Ltd | Wholesale & retail | 2026 |
| ASA Carpenters & Builders Ltd | Construction | 2008 |
| ASA Executive Ltd | Wholesale & retail | 2020 |
| ASA HR Consulting Limited | Administrative & support | 2025 |
| ASA Meats Limited | Wholesale & retail | 2019 |
| Asak Leisure Ltd | Hospitality | 2012 |
| Asamak Ltd | Hospitality | 2023 |
| Asante Care Limited | Health & social care | 2023 |
| Asap Heathrow Couriers UK Ltd | Transport & logistics | 2021 |
| Asap Property and Development Limited | Construction | 2022 |
| Asap Securities Ltd | Real estate | 2024 |
| Asap-Com Ltd | Information & communication | 2024 |
| Asare Solutions Ltd | Administrative & support | 2018 |
| ASB Construction Limited | Construction | 2013 |
| ASB Haulage Ltd | Transport & logistics | 2021 |
| Asbestos Solution Providers Limited | Professional & scientific | 2006 |
| ASC Property Investments Limited | Real estate | 2025 |
| Ascendant AI Limited | Information & communication | 2026 |
| Ascendant Consulting Services Limited | Administrative & support | 2024 |
| Ascendant Estates Ltd | Construction | 2026 |
| Ascetic Systems Limited | Professional & scientific | 2014 |
| Asch West Ltd | Construction | 2025 |
| Ascot Finishers Limited | Manufacturing | 2011 |
| Ascot Metal Finishers Limited | Professional & scientific | 1996 |
| ASD Accountants Ltd | Professional & scientific | 2016 |
| ASD Capital Properties Ltd | Real estate | 2026 |
| ASD Delivery Services Ltd | Transport & logistics | 2020 |
| ASD Developments Ltd | Construction | 2016 |
| ASD Property Ventures Ltd | Construction | 2024 |