| Arrowdox Ltd | Wholesale & retail | 2018 |
| Arrowfield Employee Trustee Limited | Extraterritorial | 2013 |
| Arrowfield Veterinary Practice Limited | Professional & scientific | 2013 |
| Arry Sea Voyange Limited | Wholesale & retail | 2025 |
| Arsalo Ltd | Wholesale & retail | 2025 |
| Art and Craft Solutions Ltd | Manufacturing | 2016 |
| Art by Africans Ltd | Wholesale & retail | 2023 |
| Art Therapy London Academic CIC | Health & social care | 2024 |
| Art With Magic International Trade Co., Ltd | Extraterritorial | 2018 |
| Artecam Limited | Transport & logistics | 2004 |
| Artemis & Bryce Limited | Wholesale & retail | 2020 |
| Artemis Global Consulting Ltd | Professional & scientific | 2023 |
| Artemis Property Services Ltd | Administrative & support | 2025 |
| Artificial Intelligence for Life Sciences Limited | Information & communication | 2024 |
| Artisan Albany House Holdings UK Limited | Financial services | 2024 |
| Artisan Blythswood Quarter Limited | Real estate | 2019 |
| Artisan Edinburgh Shandon Holdings UK Limited | Financial services | 2024 |
| Artisan Horizon Ltd | Wholesale & retail | 2025 |
| Artisan Leeds Kirkstall Limited | Real estate | 2018 |
| Artisan Locks Ltd | Wholesale & retail | 2025 |
| Artisan Real Estate Development Managers Limited | Financial services | 2020 |
| Artisan Real Estate England Limited | Professional & scientific | 2022 |
| Artisan Real Estate UK Limited | Professional & scientific | 2017 |
| Artisan Saltaire Limited | Real estate | 2020 |
| Artisan Sketch Chronicles Ltd | Construction | 2025 |
| Artisan Tearooms C.I.C. | Arts & recreation | 2011 |
| Artisanal Threads & Cross-Culture Advisory Ltd | Wholesale & retail | 2025 |
| Artisanwan Ltd | Wholesale & retail | 2025 |
| Artistars Ltd | Arts & recreation | 2025 |
| Artistique Club Limited | Extraterritorial | 2005 |
| Artistry Creatives Ltd | Wholesale & retail | 2023 |
| Artmec Holdings Ltd | Administrative & support | 2022 |
| Artofhands Ltd | Wholesale & retail | 2024 |
| Artonwheels Ltd | Wholesale & retail | 2025 |
| Artoskope Ltd | Wholesale & retail | 2025 |
| Artrepreneur Ltd | Arts & recreation | 2018 |
| Artwood Culture Limited | Real estate | 2020 |
| Arveo Limited | Wholesale & retail | 2026 |
| Arvonis Global Ltd | Wholesale & retail | 2025 |
| Arvovalta Accomodations Ltd | Hospitality | 2025 |
| Arvyn Living Limited | Real estate | 2025 |
| Arxperience Ltd | Wholesale & retail | 2024 |
| Arya Harbour Ltd | Wholesale & retail | 2024 |
| AS Fortis Ltd | Financial services | 2026 |
| Asac Investments Ltd | Financial services | 2013 |
| Asami Language Services Ltd. | Education | 2015 |
| ASB Accounting Services Ltd | Professional & scientific | 2024 |
| Asca Trade LLP | | 2010 |
| Ascemdant Global Ltd | Wholesale & retail | 2026 |
| Ascend Logic Ltd | Information & communication | 2025 |
| Ascensio Vintage Ltd | Wholesale & retail | 2023 |
| Ascent DW Limited | Information & communication | 2025 |
| Ascent Global Limited | Professional & scientific | 2020 |
| Asco Trade Ltd | Wholesale & retail | 2025 |
| Asdf Ltd | Hospitality | 2018 |
| ASE Energy Mining Co., Ltd | Administrative & support | 2021 |
| Asfar Tours Ltd | Administrative & support | 2026 |
| ASH 1 Consulting Ltd. | Professional & scientific | 2014 |
| ASH 1 Properties Ltd | Real estate | 2018 |
| ASH Inc Limited | Professional & scientific | 2009 |
| Ashbourne & Scott Intl Limited | Real estate | 2025 |
| Ashbourne Assets & Investments Limited | Real estate | 2012 |
| Ashbourne Capital LLP | | 2026 |
| Ashford James Prop Co Ltd | Real estate | 2018 |
| Ashlay Ltd | Wholesale & retail | 2025 |
| Ashley Crowden Photography Limited | Professional & scientific | 2021 |
| Ashnick Ltd | Real estate | 2022 |
| Ashtel Limited | Wholesale & retail | 2017 |
| Ashwell Analytica Ltd | Information & communication | 2026 |
| Ashwood & Avery Estates Ltd | Real estate | 2025 |
| Asia HT Electrical Co., Ltd | Wholesale & retail | 2025 |
| Asia the Ocean Ltd | Agriculture & fishing | 2025 |
| Asia-Europe Cultural and Artistic Exchange Association | Other services | 2025 |
| Asian Sparrow Ltd | Wholesale & retail | 2026 |
| Asian Webhelp Limited | Information & communication | 2024 |
| ASK Lions Limited | Information & communication | 2026 |
| Aslin Industry & Trade Co., Ltd | Wholesale & retail | 2025 |
| ASM South America Promotion Company Limited | Information & communication | 2025 |
| Asma Global Trading Company Limited | Wholesale & retail | 2025 |
| Asoom Ltd | Manufacturing | 2023 |
| Aspects of Spain Limited | Administrative & support | 1994 |
| Aspern Grove Ltd | Real estate | 2020 |
| Aspirationz Ltd | Hospitality | 2018 |
| Aspire Path CIC | Health & social care | 2026 |
| Assembled Moments Ltd | Arts & recreation | 2024 |
| Asset Avenue Capital Ltd | Real estate | 2024 |
| Asset Land Holdings Ltd | Real estate | 2016 |
| Asset Oracle 3D Ltd | Wholesale & retail | 2025 |
| Assetpinnacle Ltd | Wholesale & retail | 2025 |
| Association of Equality Scheme Providers | Other services | 2012 |
| Association of International Education | Education | 2020 |
| Assure Group Limited | Hospitality | 2006 |
| Assured Motor Assessing Ltd | Financial services | 2026 |
| AST Private Enterprise Ltd | Financial services | 2016 |
| Astalume Ltd | Wholesale & retail | 2025 |
| Asteco Solutions Limited | Wholesale & retail | 2017 |
| Asteria Vision Media Ltd | Arts & recreation | 2025 |
| Astra Services Limited | Professional & scientific | 2020 |
| Astra Ventures Trade Ltd | Wholesale & retail | 2025 |
| Astracommerce Trade Ltd | Wholesale & retail | 2026 |