| ACC Social Club Limited | Hospitality | 2025 |
| Access Advisory Solutions Ltd | Other services | 2025 |
| Access Ahead Limited | Professional & scientific | 2011 |
| Access and Inform Limited | Wholesale & retail | 2004 |
| Access by Shepherd Limited | Construction | 2023 |
| Access Denied Ltd | Administrative & support | 2023 |
| Access NDT Limited | Mining & quarrying | 2009 |
| Access Platforms (Aberdeen) Limited | Administrative & support | 2005 |
| Access Solutions Scotland Ltd | Mining & quarrying | 2022 |
| Access XL Limited | Manufacturing | 2012 |
| Accetz Limited | Construction | 2025 |
| Accg Limited | Hospitality | 2018 |
| Acciona Industrial UK Limited | Construction | 2019 |
| Accord Business Partnerships Limited | Administrative & support | 2010 |
| Accord Energy Solutions Limited | Professional & scientific | 2010 |
| Accountability Aberdeen Ltd | Professional & scientific | 2018 |
| Accountants for Business (UK) Ltd. | Professional & scientific | 2008 |
| Accrete Petroleum (UK) Ltd | Professional & scientific | 2009 |
| Accuenergy Solutions Ltd | Mining & quarrying | 2019 |
| Accura Measurement Limited | Administrative & support | 2007 |
| Ace Aviation Services Limited | Transport & logistics | 2003 |
| Ace Comps Group Ltd. | Other services | 2021 |
| Ace Decy Ltd | Professional & scientific | 2012 |
| Ace Dermatology Ltd | Other services | 2012 |
| Ace Forwarding Limited | Transport & logistics | 1996 |
| Ace Manpower Limited | Administrative & support | 2007 |
| Ace of Blades Limited | Other services | 2015 |
| Acecourse Solutions Ltd | Administrative & support | 2025 |
| Acer Aviation Ltd | Manufacturing | 2025 |
| Acera Ltd | Professional & scientific | 2018 |
| Acetec Building Services Limited | Construction | 2024 |
| Acewright Ltd | Information & communication | 2025 |
| Acge Ltd | Professional & scientific | 2024 |
| Achates Limited | Administrative & support | 2012 |
| Acis Youth CIC | Health & social care | 2025 |
| ACM Letting Ltd | Real estate | 2014 |
| Acrewind Limited | Administrative & support | 2014 |
| Acrostic NO.1 Limited | Wholesale & retail | 2014 |
| ACS Eccles Electrical Limited | Administrative & support | 2013 |
| ACS Hardware Ltd | Wholesale & retail | 2020 |
| ACS31 Ltd | Real estate | 2023 |
| Act-Geo Ltd | Professional & scientific | 2024 |
| Activ Delivery Ltd | Transport & logistics | 2024 |
| Active Balance Ltd | Health & social care | 2009 |
| Active Healthstyle Limited | Professional & scientific | 2015 |
| Active Logistics (Scotland) Ltd | Transport & logistics | 2014 |
| Active Technical Services Ltd. | Hospitality | 1998 |
| Activityid Ltd | Information & communication | 2021 |
| Activpayroll Ltd. | Information & communication | 1999 |
| Acton Engineering Limited | Professional & scientific | 2005 |
| Acuity 4.0 Ltd | Professional & scientific | 2022 |
| Acuity Energy Consulting Ltd | Professional & scientific | 2025 |
| ACUITY20 Limited | Professional & scientific | 2019 |
| Acumen Holdings (Aberdeen) Limited | Administrative & support | 2001 |
| Acumenia Global Ltd | Information & communication | 2025 |
| AD Geotechnical Services Ltd | Construction | 2024 |
| AD Marine (Scotland) Limited | Professional & scientific | 2024 |
| AD Retail Ltd | Wholesale & retail | 2023 |
| AD Rock Consulting Limited | Professional & scientific | 2015 |
| AD2R Property Ltd | Real estate | 2023 |
| AD4SPROPERTY Ltd | Real estate | 2024 |
| ADA Engineering Ltd | Professional & scientific | 2022 |
| Adac Healthcare Ltd | Health & social care | 2026 |
| Adagio (UK) Limited | Arts & recreation | 2004 |
| Adakirikiritv Media Ltd | Information & communication | 2025 |
| Adam Sinclair & Associates Wealth Management Ltd | Financial services | 2021 |
| Adamjojo Holdings Limited | Wholesale & retail | 2025 |
| Adams Drilling Limited | Other services | 2008 |
| Adams Electrical Ltd | Manufacturing | 2019 |
| Adams Watch Specialist Ltd | Other services | 2018 |
| Adamspro Consulting Limited | Information & communication | 2019 |
| Adamspubco Ltd | Professional & scientific | 2003 |
| Adaptive Catering Company Limited | Hospitality | 2017 |
| Adaptive Process Solutions Ltd | Other services | 2021 |
| Adatho Engineering Limited | Mining & quarrying | 2024 |
| ADC AI Ltd | Administrative & support | 2021 |
| ADC Energy Limited | Professional & scientific | 1986 |
| ADD Accountancy Limited | Professional & scientific | 2003 |
| ADD Energy Scotland Limited | Professional & scientific | 2010 |
| ADD Latent Limited | Information & communication | 2004 |
| ADD Value Consultancy Ltd | Information & communication | 2020 |
| Addiewell Prison (Holdings) Ltd | Financial services | 2005 |
| Addiewell Prison Ltd | Administrative & support | 2005 |
| Addvantage Ledgers Ltd | Professional & scientific | 2025 |
| Adeca Engineering Limited | Professional & scientific | 2011 |
| Adelaida LP | | 2012 |
| Adele Middler Ltd | Professional & scientific | 2023 |
| Adelphi 19 Limited | Households | 2012 |
| Adelphi Brothers Ltd | Real estate | 2021 |
| Adelphi Investments Limited | Real estate | 2018 |
| Adelphi Kitchen Limited | Hospitality | 2017 |
| Adelphi Scott Limited | Households | 2012 |
| Ades NDT Limited | Administrative & support | 2014 |
| Ades-Bellevue-Consultancy-Services (Bacss) Ltd | Information & communication | 2025 |
| ADH Global Ventures Ltd | Construction | 2025 |
| Adhd Adventures Ltd | Health & social care | 2024 |
| Adhi Peraman Engineering Limited | Professional & scientific | 2009 |
| Adler Project Solutions Ltd | Professional & scientific | 2025 |
| ADM Farming Services Ltd | Agriculture & fishing | 2023 |
| Adon Offshore Solutions Ltd | Professional & scientific | 2011 |