| Artemis Sales Ltd | Wholesale & retail | 2026 |
| Artgeo Limited | Professional & scientific | 2012 |
| Artificial Lift Performance Limited | Administrative & support | 2010 |
| Artist Nails Ltd | Other services | 2017 |
| Artquick Limited | Professional & scientific | 1990 |
| Arts Link Collective Ltd | Education | 2025 |
| Aryballos Skin Ltd | Manufacturing | 2025 |
| AS Cube Engineering Solutions Ltd | Professional & scientific | 2014 |
| AS Dhanola Group Limited | Hospitality | 2021 |
| AS Estimations and Consultants Limited | Professional & scientific | 2025 |
| AS Falk Services Limited | Health & social care | 2010 |
| AS Fast Foods Ltd | Hospitality | 2020 |
| AS93 Ltd | Real estate | 2022 |
| ASA Cults Ltd | Hospitality | 2019 |
| ASA Developments Limited | Real estate | 2015 |
| ASA Flats Limited | Households | 2019 |
| ASA Leasing Limited | Households | 2019 |
| ASA Lets Limited | Households | 2019 |
| ASA Letting Limited | Households | 2019 |
| ASA Properties Letting Limited | Households | 2019 |
| ASA Property Leasing Limited | Households | 2019 |
| Asamg Limited | Professional & scientific | 2012 |
| Asanco Limited | Mining & quarrying | 2010 |
| ASAT24 Limited | Hospitality | 2024 |
| ASB Plant Services (Scotland) Limited | Administrative & support | 2010 |
| ASC Communications Limited | Professional & scientific | 2008 |
| Ascend Communication Consulting Limited | Professional & scientific | 2022 |
| Ascman Ltd | Information & communication | 2017 |
| Asco Decommissioning Limited | Administrative & support | 1997 |
| Asco Freight Management Limited | Administrative & support | 1999 |
| Asco Holdings Limited | Administrative & support | 2006 |
| Asco JV Holdings Limited | Transport & logistics | 2008 |
| Asco Marine Limited | Administrative & support | 2007 |
| Asco Properties Limited | Administrative & support | 2006 |
| Asco UK Limited | Other services | 1954 |
| Asco Ventures Limited | Transport & logistics | 2016 |
| Ascript Automation Limited | Information & communication | 2025 |
| Asean ST. Andrew Society Limited | Other services | 2022 |
| Asfoor Ltd | Information & communication | 2025 |
| ASG Inspection Ltd | Administrative & support | 2015 |
| ASH Accountancy Solutions Ltd | Professional & scientific | 2019 |
| ASH Consultancy Services Ltd | Professional & scientific | 2022 |
| ASH Engineering Ltd | Professional & scientific | 2024 |
| ASH Marketing Services Ltd | Wholesale & retail | 2018 |
| Asha Assets Limited | Real estate | 2023 |
| Ashborne Developments Ltd | Real estate | 2025 |
| Ashbrook Farm Limited | Agriculture & fishing | 2022 |
| Asher Consultancy Services Limited | Information & communication | 2011 |
| Ashgrove Motor Body Company (Aberdeen) Limited | Administrative & support | 2011 |
| Ashgrove Motor Body Company (Inverness) Limited | Administrative & support | 2016 |
| Ashgrove Motor Body Company Limited | Administrative & support | 2011 |
| Ashley 2006 Limited | Extraterritorial | 1989 |
| Ashley Armstrong Physiotherapy Ltd | Health & social care | 2025 |
| Ashley Grove Owners Limited | Real estate | 2024 |
| Ashley Properties Aberdeen Limited | Administrative & support | 2007 |
| Ashore Global Services Ltd | Wholesale & retail | 2023 |
| Ashridge Capital Fund I CI GP Limited | Financial services | 2009 |
| Ashridge Capital Fund I CI LP | | 2009 |
| Ashtara AI Ltd | Information & communication | 2026 |
| Ashtown Intervention & Completion Services Ltd | Mining & quarrying | 2025 |
| Ashwell Tobacco Ltd | Wholesale & retail | 2025 |
| Asia Kitchen Ltd | Hospitality | 2023 |
| Asia Project LP | | 2013 |
| Askel Consulting Limited | Professional & scientific | 2025 |
| Asko Commercial Property Limited | Real estate | 2024 |
| Asko Properties Limited | Real estate | 2019 |
| Asma Group Ltd | Wholesale & retail | 2025 |
| Aspcchair Ltd | Professional & scientific | 2020 |
| Aspect Employee Trustee Company Limited | Professional & scientific | 2024 |
| Aspect Property Pro Services Ltd | Construction | 2024 |
| Aspect Reputation Management Limited | Professional & scientific | 2014 |
| Aspen & Birch Ltd | Wholesale & retail | 2024 |
| Aspire Building Aberdeen Ltd | Construction | 2024 |
| Aspire Hospitality Pubs Ltd | Hospitality | 2025 |
| Aspire Lettings Group Limited | Real estate | 2026 |
| Aspire Roofing Aberdeen Ltd | Construction | 2026 |
| Assar Business Limited | Wholesale & retail | 2026 |
| Assassin Boxing Promotions and Management Limited | Administrative & support | 2017 |
| Assecutio Ltd | Professional & scientific | 2023 |
| Asset Integrity Management Solutions Limited | Professional & scientific | 2012 |
| Asset One (Consultants) LLP | | 2023 |
| Asset One (Digital) Limited | Information & communication | 2025 |
| Asset One (Group) Limited | Professional & scientific | 2023 |
| Asset V Crewing (UK) Limited | Administrative & support | 2021 |
| Assetech Ltd | Real estate | 2025 |
| Assetneering Ltd | Professional & scientific | 2012 |
| Assetworx Ltd | Information & communication | 2023 |
| Assurance Developments Limited | Real estate | 2016 |
| Assurance Homes Limited | Real estate | 2005 |
| Assured Flow Limited | Professional & scientific | 2026 |
| Assured Occupational Health Limited | Health & social care | 2015 |
| Astoria Property Partners Ltd | Real estate | 2026 |
| Astra Maifair Ltd | Hospitality | 2023 |
| Astraea Creative Limited | Information & communication | 2018 |
| Astrife Ltd | Professional & scientific | 2020 |
| ASW Aberdeen Ltd | Construction | 2004 |
| Asya Integrity Limited | Professional & scientific | 2011 |
| Asylum Books and Games Limited | Wholesale & retail | 1999 |
| Atalassa LP | | 2013 |
| ATC (Energy) Ltd | Education | 2018 |