| Archer & Pearl Ltd | Manufacturing | 2018 |
| Archibald the 3RD Limited | Information & communication | 2022 |
| Archie Maisie Management Group Ltd | Professional & scientific | 2022 |
| Archimedes Legal Ltd | Professional & scientific | 2026 |
| Architectural Plastics (Handrail) Limited | Construction | 1970 |
| Architectural Services York Ltd | Professional & scientific | 2018 |
| Architecture One Eight Ltd | Professional & scientific | 2017 |
| Archon Building Solutions Limited | Construction | 2023 |
| Archouse Ltd | Information & communication | 2025 |
| Arcvelop Investor Group North Holdings Limited | Real estate | 2023 |
| Arcvelop Investor Group North Limited | Real estate | 2023 |
| Ardane Park Limited | Real estate | 2014 |
| Arden House Harrogate Limited | Hospitality | 2015 |
| Ardent Elements Ltd | Construction | 2023 |
| Ardent IT Security and Resilience Ltd | Information & communication | 2017 |
| Area Fifty One Limited | Extraterritorial | 2012 |
| Aredis Limited | Agriculture & fishing | 2001 |
| Areus Limited | Extraterritorial | 2009 |
| Argent Building & Joinery Limited | Construction | 2020 |
| Argo Partners Ltd | Administrative & support | 2022 |
| ARI T Hart Ltd. | Administrative & support | 2019 |
| Aries Wealth Management Limited | Financial services | 2017 |
| Arindel Multiresources Ltd | Administrative & support | 2024 |
| Arise-Arena Ltd | Education | 2024 |
| Arity Solutions Limited | Information & communication | 2012 |
| Arkan Future Investment Company Ltd | Wholesale & retail | 2024 |
| Arkan Integrated Systems Ltd | Wholesale & retail | 2024 |
| Arks UK R&D Ltd | Professional & scientific | 2024 |
| Arlington Marketing Limited | Administrative & support | 2019 |
| Arlington Turi Ltd | Wholesale & retail | 2020 |
| Armaillis Limited | Real estate | 2018 |
| Armaris Technology Limited | Information & communication | 2024 |
| Armenor Ltd | Information & communication | 2024 |
| Armstrong Bullen Limited | Professional & scientific | 2023 |
| Armv Dental Limited | Health & social care | 2024 |
| Armv Property Ltd | Real estate | 2021 |
| Arnett Advisory Group Limited | Information & communication | 2023 |
| Arnett FIC Limited | Real estate | 2021 |
| Arnett FIC Two Ltd | Real estate | 2021 |
| Arngate Limited | Administrative & support | 1988 |
| Arqa Partners Ltd | Information & communication | 2024 |
| Arrow Enterprise Computing Solutions Limited | Information & communication | 2000 |
| Arrowsmith Properties Limited | Real estate | 2025 |
| Art and Kindness Ltd | Wholesale & retail | 2021 |
| Art by Alice Mcintosh Ltd | Construction | 2022 |
| Art From the Heart (UK) Limited | Arts & recreation | 2013 |
| Art in Spaces UK Ltd | Wholesale & retail | 2024 |
| Art of Hair (Harrogate) Limited | Other services | 2013 |
| Art Stamped Limited | Wholesale & retail | 2018 |
| Artemis Employment Solutions Ltd | Administrative & support | 2022 |
| Arthington Spirits Limited | Manufacturing | 2018 |
| Arthur Paul Properties Ltd | Real estate | 2022 |
| Artificial Intelligence Ayup Limited | Information & communication | 2023 |
| Artily Group Ltd | Financial services | 2013 |
| Artin Denta Ltd | Health & social care | 2025 |
| Artisan Group Limited | Extraterritorial | 2025 |
| Artium (MS) Developments Limited | Real estate | 2025 |
| Artopian Ltd | Information & communication | 2023 |
| Artus Digital Marketing Limited | Professional & scientific | 2020 |
| Artworks Conservation Limited | Professional & scientific | 2009 |
| Arvato Wholesale and Retail Ltd | Manufacturing | 2026 |
| Arvika(Uk) Ltd | Wholesale & retail | 2024 |
| AS Food Services Ltd | Hospitality | 2018 |
| Asaf Contracting Company Ltd | Construction | 2020 |
| Asas Aleamar Contracting Ltd | Construction | 2025 |
| Ascend Consulting Services Ltd | Professional & scientific | 2021 |
| Ascend Global Consulting Ltd | Professional & scientific | 2018 |
| Ascend Innovations Ltd | Wholesale & retail | 2024 |
| Ascend Marketing Group Ltd | Professional & scientific | 2026 |
| Ascensor Digital Ltd | Professional & scientific | 2026 |
| Ascent Limited | Professional & scientific | 2004 |
| Ascot House Holdings Limited | Hospitality | 2008 |
| Ascot House Hotel Limited | Hospitality | 1988 |
| ASE Cctv Limited | Information & communication | 2021 |
| ASH Road Management Company Limited | Households | 1998 |
| Ashby Consulting Services Limited | Information & communication | 2022 |
| Ashfort Pharmaceuticals UK Ltd | Manufacturing | 2025 |
| Ashkor Pareto Ltd | Real estate | 2025 |
| Ashley Advisory Limited | Professional & scientific | 2010 |
| Ashley Group Limited | Extraterritorial | 2026 |
| Ashley Homburg (Associates) Limited | Information & communication | 2008 |
| Ashley Jordan Limited | Extraterritorial | 2025 |
| Ashtech Science Ltd | Professional & scientific | 2023 |
| Ashton Dynamics Ltd | Extraterritorial | 2023 |
| Ashton Hamilton Limited | Extraterritorial | 2025 |
| Ashton Smith Associates Limited | Professional & scientific | 2004 |
| Ashton Smith LLP | | 2009 |
| Ashton-Jones Management Consultancy Ltd | Professional & scientific | 2015 |
| Ashtonabraham Limited | Construction | 2023 |
| Ashville College Trustee Limited | Education | 2002 |
| Ashville Foundation | Education | 2009 |
| Ashville Trading Limited | Hospitality | 1991 |
| Asiscometa Limited | Professional & scientific | 2015 |
| ASK Logistiqs Limited | Transport & logistics | 2023 |
| Askwith Investments Limited | Construction | 1986 |
| Askwith Structural Detailing Limited | Professional & scientific | 2009 |
| ASL Business Consulting Limited | Professional & scientific | 2022 |
| Asmara Group Ltd | Wholesale & retail | 2022 |
| Aspalls Investment Holdings Limited | Financial services | 2019 |
| Aspect CPM (UK) Limited | Wholesale & retail | 2013 |