| AR Aviation Engineering Ltd | Manufacturing | 2022 |
| AR Building Services (Aberdeen) Ltd | Construction | 2024 |
| AR Goheer Care Limited | Health & social care | 2025 |
| AR IT Limited | Information & communication | 2024 |
| ARA Consultants Ltd | Professional & scientific | 2025 |
| Aratellus Group Limited | Financial services | 2023 |
| Aratellus Offshore Limited | Administrative & support | 2020 |
| Aratellus Subsea Limited | Professional & scientific | 2023 |
| Araña London Ltd | Manufacturing | 2026 |
| ARB Engineering Ltd. | Mining & quarrying | 2006 |
| Arboros Limited | Professional & scientific | 2025 |
| ARC Flash Safety Limited | Professional & scientific | 2016 |
| Arc-Work Ltd | Manufacturing | 2010 |
| Arcadia Environmental Ltd | Professional & scientific | 2023 |
| Arcairn Ltd | Households | 2025 |
| Arcana Creative House Ltd | Professional & scientific | 2026 |
| Arcane Rituals Ltd | Information & communication | 2021 |
| Arcane Subsea Limited | Mining & quarrying | 2022 |
| Arch 35 Marketing Limited | Professional & scientific | 2024 |
| Arch Lane Interiors Ltd | Wholesale & retail | 2026 |
| Archer (UK) Limited | Mining & quarrying | 2002 |
| Archer Consulting Resources Limited | Mining & quarrying | 2004 |
| Archer Knight (Holdings) Limited | Other services | 2016 |
| Archer Knight Consultancy Limited | Other services | 2018 |
| Archer Knight Market Intelligence Limited | Other services | 2018 |
| Archer Scot Ltd | Wholesale & retail | 2017 |
| Archer Well Services (Saudi Arabia) Limited | Mining & quarrying | 2019 |
| Archers Heating Limited | Construction | 2019 |
| Archibald Properties Ltd | Construction | 2021 |
| Archibald Subsea Services Limited | Mining & quarrying | 2018 |
| Archie Cousins Limited | Manufacturing | 2026 |
| Archie Ventures Limited | Hospitality | 2011 |
| Archilink Limited | Professional & scientific | 2018 |
| Archimech Limited | Professional & scientific | 2013 |
| Archontes Property Limited | Real estate | 2021 |
| Archpeak Limited | Real estate | 2001 |
| Arcon Retreats Ltd | Hospitality | 2025 |
| Arcr Properties Ltd | Real estate | 2022 |
| Arcsol Limited | Professional & scientific | 2024 |
| Arctic Auto Ltd | Wholesale & retail | 2026 |
| Arcturus IT Solutions Ltd. | Information & communication | 2016 |
| Arcus Limited | Mining & quarrying | 2000 |
| ARD Facilities Ltd | Construction | 2026 |
| Ardane Engineering Limited | Hospitality | 1982 |
| Ardbrae Management Ltd | Information & communication | 2016 |
| Arden & Voss Limited | Wholesale & retail | 2024 |
| Ardent Modular Systems Limited | Construction | 2013 |
| Ardent Scot Limited | Manufacturing | 2024 |
| Ardent Spirit Holdings Limited | Financial services | 2019 |
| Ardroil Investment Company Limited | Real estate | 1980 |
| Ardson Ltd | Real estate | 2023 |
| Ardyne Holdings Limited | Professional & scientific | 2015 |
| Ardyne Technologies Limited | Professional & scientific | 2015 |
| Aren SN Ltd | Transport & logistics | 2024 |
| Arenshenol Ltd | Transport & logistics | 2026 |
| Areq Investments Ltd | Financial services | 2015 |
| Argile Ltd | Hospitality | 2020 |
| Argus Vector Well Systems Ltd | Mining & quarrying | 2026 |
| Argyle IT & Education Limited | Information & communication | 2020 |
| Argyle Trust Limited | Administrative & support | 1968 |
| Argyll Assets Ltd. | Real estate | 2008 |
| Arhold Limited | Professional & scientific | 2016 |
| ARI Subsea Services Limited | Professional & scientific | 2025 |
| Ariiba Spirits Limited | Administrative & support | 2020 |
| Arinve Limited | Financial services | 2016 |
| Arizonamercedesbrodie Ltd | Information & communication | 2026 |
| ARK Accounting Ltd | Professional & scientific | 2016 |
| ARK Apartments Ltd | Hospitality | 2022 |
| ARK IT Consultancy Limited | Information & communication | 2025 |
| Arkm Holdings Limited | Financial services | 2022 |
| Arlin Services Holdings Limited | Financial services | 2017 |
| Arlin Services Limited | Wholesale & retail | 1987 |
| Arlo Original Ltd | Professional & scientific | 2020 |
| ARM Trio Solutions Ltd | Health & social care | 2026 |
| Armour Integrated Management Systems Ltd | Professional & scientific | 2019 |
| Armourstrong Limited | Hospitality | 2024 |
| Armstrong Safety Limited | Mining & quarrying | 2011 |
| Arnhall Investments Limited | Real estate | 2020 |
| Arnlea Holdings Limited | Professional & scientific | 2014 |
| Arnlea Nexus Limited | Administrative & support | 2010 |
| Arnlea Systems Limited | Information & communication | 2001 |
| ARO Engineering Limited | Professional & scientific | 2011 |
| ARO Scotland Limited | Wholesale & retail | 2013 |
| Aromaz Ltd | Hospitality | 2022 |
| Arosscoatings Ltd | Construction | 2025 |
| Aroti Limited | Professional & scientific | 2025 |
| Arpwuk Limited | Wholesale & retail | 2025 |
| Arpx Space Ltd | Information & communication | 2025 |
| ARQ Services Ltd | Mining & quarrying | 2023 |
| Arranco 3 Limited | Professional & scientific | 2007 |
| Arranco 4 Limited | Administrative & support | 2008 |
| Array Training Limited | Mining & quarrying | 2012 |
| Arria DATA2TEXT Limited | Information & communication | 2009 |
| Arrow Horizon Assets Limited | Real estate | 2020 |
| Arrowdawn Limited | Information & communication | 2000 |
| Art Coffee Gallery Ltd | Hospitality | 2025 |
| Art Department (Aberdeen) Limited | Arts & recreation | 2006 |
| Art K Rigging Ltd | Manufacturing | 2026 |
| Art&Drink Ltd | Hospitality | 2021 |
| Artbrowser Ltd | Information & communication | 2015 |