| Arpr Properties Ltd | Real estate | 2024 |
| ARQ Ltd | Transport & logistics | 2024 |
| Arris Engineering Services Ltd | Professional & scientific | 2022 |
| Arrk Vitta Ltd | Real estate | 2024 |
| Arrow Bite Deli Ltd | Other services | 2025 |
| Arrowhead Couriers Ltd | Transport & logistics | 2018 |
| Arrows Couriers Ltd | Transport & logistics | 2025 |
| Arruvey Ltd | Hospitality | 2016 |
| Arsi Soft Drinks Limited | Wholesale & retail | 2015 |
| Art and Decoration Ltd | Construction | 2024 |
| Art Boss Ltd | Health & social care | 2022 |
| Art by Avnie Ltd | Arts & recreation | 2020 |
| Art DEN Ltd | Information & communication | 2014 |
| Art Infotech Ltd | Arts & recreation | 2018 |
| Art My Tshirt Ltd | Wholesale & retail | 2013 |
| Art of Engineering Ltd | Professional & scientific | 2019 |
| Art-Ts Ltd | Wholesale & retail | 2023 |
| Artaco Limited | Other services | 2013 |
| Artbuild Limited | Construction | 2011 |
| Arthur Stone London Limited | Wholesale & retail | 2020 |
| Artifex Construction Limited | Administrative & support | 2015 |
| Artifex Media Ltd | Information & communication | 2026 |
| Artifex UK Properties Ltd | Real estate | 2025 |
| Artio International Limited | Information & communication | 2015 |
| Artisan Exceptional Ltd | Professional & scientific | 2017 |
| Artosbakery Ltd | Manufacturing | 2025 |
| Artwork Holdings Ltd | Arts & recreation | 2019 |
| Artwork Process Ltd | Information & communication | 2018 |
| Arun Property Services Ltd | Real estate | 2021 |
| Arunan Estates Ltd | Real estate | 2026 |
| ARX Labs Ltd | Health & social care | 2023 |
| Arxs Group Ltd. | Extraterritorial | 2016 |
| Aryan Group of Companies Ltd | Manufacturing | 2021 |
| Aryan UK Services Ltd | Transport & logistics | 2019 |
| AS 1 Services Ltd | Professional & scientific | 2018 |
| AS Accountancy Solutions Limited | Professional & scientific | 2014 |
| AS Accountants (Sudbury) Limited | Professional & scientific | 2012 |
| AS Associates (GB) Limited | Professional & scientific | 2013 |
| AS Business Consultants Limited | Financial services | 2003 |
| AS Gleam Limited | Wholesale & retail | 2024 |
| AS Moon Traders Ltd | Information & communication | 2025 |
| AS Trading Limited | Administrative & support | 2008 |
| AS Wares Ltd | Wholesale & retail | 2025 |
| ASA Builders & Home Improvement Limited | Construction | 2011 |
| ASA Properties London Ltd | Real estate | 2025 |
| ASA13 Property Limited | Real estate | 2024 |
| Asahi Trade Ltd | Wholesale & retail | 2023 |
| Asai Construction Ltd | Other services | 2015 |
| Asap Couriers and Logistics Ltd | Transport & logistics | 2016 |
| ASB (LON) Ltd | Professional & scientific | 2020 |
| ASB Golders Green Ltd | Real estate | 2024 |
| ASB Group Holdings Ltd | Financial services | 2024 |
| ASB Management Ltd | Professional & scientific | 2022 |
| ASC (LON) Ltd | Administrative & support | 2011 |
| Ascend Consultancy Group Ltd | Health & social care | 2016 |
| Ascend Property Developments Ltd | Real estate | 2023 |
| Ascientia Ltd | Information & communication | 2019 |
| Ascrafts Limited | Wholesale & retail | 2019 |
| Asdow Limited | Real estate | 2016 |
| Aseel Construction Ltd | Construction | 2026 |
| Aseel Lifestyle Ltd | Wholesale & retail | 2023 |
| Asena Trade Ltd | Other services | 2022 |
| Ashapura Foods Limited | Wholesale & retail | 2004 |
| Ashapura Properties Limited | Real estate | 2026 |
| Ashcroft Real Estate Ltd | Real estate | 2023 |
| Asher’S JB Ltd | Hospitality | 2025 |
| Ashford Business College Limited | Education | 2026 |
| Ashley Gardens Ltd | Real estate | 2021 |
| Ashma Foods Ltd | Hospitality | 2021 |
| Ashmont Limited | Real estate | 2023 |
| Ashmount Consultants Limited | Extraterritorial | 2003 |
| Ashoak Clinic Ltd | Real estate | 2016 |
| Ashron Group UK Ltd | Wholesale & retail | 2022 |
| Asian Choices Ltd | Wholesale & retail | 2023 |
| Asian Funeral Limited | Other services | 2021 |
| Asian Tea Shop Ltd | Wholesale & retail | 2020 |
| Asiansbury Limited | Wholesale & retail | 2011 |
| Asinaz Properties Ltd | Real estate | 2023 |
| Asinaz Rentals Ltd | Real estate | 2023 |
| Asined Limited | Transport & logistics | 2018 |
| Asirom Transport Ltd | Other services | 2015 |
| Asixhost Ltd | Information & communication | 2023 |
| ASK Samm Ltd | Information & communication | 2026 |
| Askey & Sons Limited | Administrative & support | 2022 |
| Askey Douglas Ltd | Financial services | 2022 |
| Askj Properties Ltd | Real estate | 2025 |
| ASL Coachworks Ltd | Wholesale & retail | 2025 |
| ASL UK Partners Ltd | Professional & scientific | 2026 |
| ASM Airconditioning Limited | Energy | 2012 |
| Asma Aamir Ltd | Wholesale & retail | 2024 |
| Asma Shop Ltd | Wholesale & retail | 2023 |
| Asmani Ltd | Wholesale & retail | 2026 |
| Aspective Limited | Information & communication | 2023 |
| Aspen Rowe Ltd | Real estate | 2016 |
| Aspendos Solutions Limited | Information & communication | 2007 |
| Asper Technologies Limited | Information & communication | 2020 |
| Aspire After School Club Ltd | Health & social care | 2025 |
| Aspire.Aesthetic.Clinic Limited | Other services | 2025 |
| Aspiro Consulting Ltd | Professional & scientific | 2013 |
| Aspra Construction Ltd | Construction | 2023 |