| Anushka Food & Wine Limited | Wholesale & retail | 2017 |
| ANV Holdings Ltd. | Hospitality | 2022 |
| ANW Ltd | Information & communication | 2017 |
| ANY Floor Treatment Specialist Ltd | Construction | 2020 |
| AOF Consultants Ltd | Professional & scientific | 2017 |
| AOP Management Services Ltd | Administrative & support | 2018 |
| AOR Legal Ltd | Professional & scientific | 2022 |
| Apea Consulting Ltd | Professional & scientific | 2024 |
| Apexgo Ltd | Other services | 2025 |
| Apexmove Services Ltd | Transport & logistics | 2025 |
| Apna DELHI6 Ltd | Hospitality | 2025 |
| Apocalypse Club Limited | Wholesale & retail | 2026 |
| Approved Plumbing & Heating Solutions Ltd | Manufacturing | 2026 |
| April Traders Limited | Wholesale & retail | 2016 |
| Aprn Consultancy Limited | Information & communication | 2014 |
| Apsm Commercials Limited | Financial services | 2025 |
| Apsm Financial Services Ltd | Financial services | 2022 |
| Apsm Properties Ltd | Real estate | 2020 |
| Aquaneed Limited | Construction | 2001 |
| Aquent Limited | Real estate | 2025 |
| Area Group Consultancy Services Ltd | Information & communication | 2026 |
| Area Group Ltd | Real estate | 2018 |
| Argetlam Ltd | Information & communication | 2025 |
| Arithim Ltd | Information & communication | 2026 |
| Arkj Consulting Ltd | Professional & scientific | 2024 |
| Arks Designers Limited | Manufacturing | 2014 |
| Arks Sports Limited | Wholesale & retail | 2020 |
| Arlo Technologies UK Limited | Information & communication | 2018 |
| Armaan Contractors Ltd | Construction | 2025 |
| Armand Homes Ltd | Real estate | 2025 |
| Armaz Limited | Wholesale & retail | 2021 |
| Arnav Investments Limited | Real estate | 2017 |
| Arnik Investment Ltd | Real estate | 2018 |
| Arnik Limited | Financial services | 2016 |
| Arnik Swan Court Ltd | Construction | 2023 |
| Arona House Flat Management Company Limited | Households | 2004 |
| ARONTECH1 Limited | Information & communication | 2026 |
| Arora Homes Limited | Real estate | 2021 |
| Arora INT Ltd | Wholesale & retail | 2017 |
| Arsu Technogies Private Limited | Information & communication | 2026 |
| Art Consultants (UK) Ltd | Professional & scientific | 2015 |
| Art Prop Ltd | Real estate | 2021 |
| Artefood Ltd | Hospitality | 2018 |
| Artemiadirect Ltd | Wholesale & retail | 2026 |
| Artstech Fusion Limited | Education | 2014 |
| Arvela Ltd | Professional & scientific | 2026 |
| Arzoyi Kraft Ltd | Wholesale & retail | 2025 |
| AS Business Specialists Ltd | Wholesale & retail | 2023 |
| ASA Diamond & Gold Ltd | Wholesale & retail | 2020 |
| ASA Jewellery Ltd | Wholesale & retail | 2025 |
| Asbd Properties Ltd | Real estate | 2024 |
| Ascot Barclay Group Limited | Professional & scientific | 2017 |
| Asees Enterprise Limited | Wholesale & retail | 2016 |
| Asgard RA Ltd | Real estate | 2025 |
| ASH Court (Addlestone) Limited | Households | 1987 |
| ASH Surveying Ltd | Professional & scientific | 2023 |
| Asher Education Limited | Other services | 2014 |
| Ashford Corporation Limited | Real estate | 2009 |
| Ashford Road Ltd | Real estate | 2023 |
| Ashford Youth and Community CIC | Education | 2020 |
| Ashmore Farm Limited | Agriculture & fishing | 2018 |
| Ashmore Properties (London) Limited | Administrative & support | 2013 |
| Ashville Technology Limited | Information & communication | 2021 |
| Asian Mirror Ltd | Information & communication | 2012 |
| Asjf Services Ltd | Professional & scientific | 2024 |
| ASK Appliance Repairs Ltd | Other services | 2025 |
| ASK Financial Services Ltd | Financial services | 2018 |
| ASL Contractors Ltd | Wholesale & retail | 2024 |
| Aspen Close Management Company Limited | Households | 1984 |
| ASR Express Ltd | Transport & logistics | 2025 |
| ASR Worldwide Limited | Transport & logistics | 2015 |
| AT27 Ltd | Arts & recreation | 2025 |
| ATF Logistics Ltd | Transport & logistics | 2019 |
| ATH M Ltd | Construction | 2024 |
| Athena Infotech Limited | Information & communication | 2008 |
| Athena Investech Holdings Limited | Real estate | 2014 |
| Athena Peters Investments Limited | Real estate | 2014 |
| Athena Risk Ltd | Professional & scientific | 2016 |
| Atkinson IT Ltd | Information & communication | 2026 |
| Atos Star Ltd | Wholesale & retail | 2013 |
| Attixrumi Ltd | Wholesale & retail | 2026 |
| Audisense Ltd | Health & social care | 2026 |
| Auditdata Limited | Information & communication | 2006 |
| Aura Dynamics Limited | Wholesale & retail | 2025 |
| Auraview Tech Ltd | Wholesale & retail | 2026 |
| Autocare Wraysbury Limited | Wholesale & retail | 2015 |
| Automateme Ltd. | Administrative & support | 2013 |
| Automatic Data Processing Limited | Information & communication | 1969 |
| Autos Classic Ltd | Wholesale & retail | 2025 |
| AV Helios Consulting Ltd | Construction | 2013 |
| AVA School of Motoring Ltd | Education | 2026 |
| Avad London Limited | Wholesale & retail | 2025 |
| Avelia Trade & Consulting Ltd | Wholesale & retail | 2025 |
| Avellion Property Partners Ltd | Real estate | 2026 |
| Aversys Services Ltd | Information & communication | 2011 |
| Aviation Training Consultants (ATC) Limited | Professional & scientific | 2004 |
| Avicam Aviation Ltd | Transport & logistics | 2011 |
| Avidity Living Ltd | Administrative & support | 2016 |
| Avidityfour Limited | Real estate | 2025 |
| Avlore Ltd | Wholesale & retail | 2024 |