| AC Decon Ltd | Health & social care | 2026 |
| AC Smiles Limited | Health & social care | 2024 |
| Ac&H 181 Limited | Extraterritorial | 2003 |
| Ac&H 231 Limited | Construction | 2007 |
| Ac&H 253 Limited | Construction | 2008 |
| Academy IT Services Limited | Other services | 2015 |
| Accendo Consultants Ltd | Professional & scientific | 2016 |
| Access Lock Company Limited | Professional & scientific | 1997 |
| Accession Mezzanine Capital II L.P. | | 2007 |
| Accession Mezzanine Capital L.P. | | 2001 |
| Accuracy Accounting Limited | Professional & scientific | 2026 |
| Accuracy Nominees Limited | Professional & scientific | 2025 |
| ACD Systems (Scotland) Ltd | Administrative & support | 2009 |
| Ace Global Dyeing Ltd | Manufacturing | 2026 |
| Ace Global Printing Ltd | Manufacturing | 2026 |
| Ace Joinery and Building Ltd | Construction | 2024 |
| Ace of Fades 2 Ltd | Other services | 2026 |
| Ace of Fades Ranya Ltd | Other services | 2024 |
| Ace Paving Strathclyde Ltd | Construction | 2025 |
| Acer Rentals Limited | Administrative & support | 2010 |
| Acorn Personal Development Ltd | Professional & scientific | 2025 |
| Acqumer Ltd | Professional & scientific | 2022 |
| ACR Tuning Ltd | Wholesale & retail | 2022 |
| ACS Refrigeration Installation Ltd | Professional & scientific | 2021 |
| Action Trade Spares and Cars Ltd | Wholesale & retail | 2025 |
| Actionus Development Limited | Professional & scientific | 2010 |
| ACU Productions Ltd | Health & social care | 2026 |
| Acumen Group UK Holdings Ltd. | | 2024 |
| Acutus Programme Management Limited | Professional & scientific | 2005 |
| Adam Crawford Letting Ltd | Real estate | 2023 |
| Adam Dining Ltd | Hospitality | 2025 |
| Adapt Electrical Scotland Ltd | Construction | 2020 |
| Adaptable Fashion Limited | Wholesale & retail | 2019 |
| Adaptive Agility Limited | Information & communication | 2022 |
| Addison Nest Properties Ltd | Real estate | 2023 |
| Adele's 2 Limited | Other services | 2024 |
| Adele's Hair Company Limited | Other services | 2009 |
| Adigo Limited | Health & social care | 2018 |
| Adorable Children's Wear Limited | Wholesale & retail | 2017 |
| Adriel Group Ltd | Wholesale & retail | 2025 |
| Advanced Eco Technology Limited | | 2022 |
| Advanced Windows & Conservatories (Scotland) Ltd | Manufacturing | 2015 |
| Advanceworx Creative Communications Limited | Information & communication | 2015 |
| Advancing Healthcare Academy Ltd | Education | 2019 |
| AEA Private Limited | Health & social care | 2022 |
| Aerlift Limited | Construction | 2008 |
| Aermore Forgeworks Ltd | Manufacturing | 2026 |
| Aerowind Limited | Manufacturing | 2025 |
| Aesthetics by Yvonne Ltd | Other services | 2022 |
| Affiniti BMS Ltd | Construction | 2017 |
| Affiniti Response Limited | Construction | 2007 |
| Affordablestays Ltd | Real estate | 2026 |
| Afsd Limited | Information & communication | 2025 |
| Afterecho Ltd | Information & communication | 2026 |
| AFW Engineering (Scotland) Limited | Professional & scientific | 2024 |
| AG Psychology Ltd | Health & social care | 2022 |
| AG UK Supplies Ltd | Wholesale & retail | 2023 |
| Agency Orthotics Ltd | Administrative & support | 2024 |
| AGG Valeting Ltd | Wholesale & retail | 2024 |
| Aglow Heating & GAS Services Ltd | Construction | 2023 |
| Agora Contracts Limited | Construction | 2024 |
| AHA Ventures Limited | Wholesale & retail | 2016 |
| AI Licensed Grocers Ltd | Wholesale & retail | 2025 |
| AII Property Management Limited | Real estate | 2008 |
| Airdrie Clinic Ltd | Health & social care | 2019 |
| Airdrie Decking Ltd | Administrative & support | 2017 |
| Airdrie Fencing Ltd | Administrative & support | 2010 |
| Airs 8 Estates Ltd | Real estate | 2026 |
| AIS Ventures Ltd | Real estate | 2024 |
| Aism Ltd | Agriculture & fishing | 2023 |
| AIT Leisure Limited | | 2008 |
| AIT Shona Property Ltd | Real estate | 2026 |
| Aiyzaf Investments Limited | Real estate | 2023 |
| AJ Homemade Foods Ltd | Manufacturing | 2025 |
| AJ Implant and Prosthetics Dental LAB Ltd | Manufacturing | 2024 |
| AJ Premium Lets Ltd | Real estate | 2026 |
| AJ Stone Masonry Ltd | Construction | 2020 |
| AJB Group Properties Ltd | Real estate | 2016 |
| AJL Frame Ltd | Households | 2022 |
| Ajlm Limited | Real estate | 2023 |
| Ajnala FS Limited | Wholesale & retail | 2026 |
| Ajpv Ltd | Real estate | 2020 |
| AK Private Care Ltd | Health & social care | 2023 |
| AKA Scotland Ltd | Arts & recreation | 2026 |
| AKB Assets Ltd | Real estate | 2023 |
| Akko Refurbishment Services Ltd | Construction | 2011 |
| AKS Integrated Systems Limited | Construction | 2025 |
| Akshaya Property Ltd | Real estate | 2024 |
| Akura Distribution Limited | Transport & logistics | 1998 |
| Al-Marruna Limited | | 2023 |
| Alaaro Ltd | Real estate | 2017 |
| Alaman Ltd | Health & social care | 2024 |
| Alan Energy Limited | Energy | 2014 |
| Alan Mcgarvie Ltd | Professional & scientific | 2011 |
| Alanbridge Limited | Professional & scientific | 2007 |
| Alarmco Fire & Electrical Ltd | Construction | 2018 |
| Alarmco Homecare Limited | Other services | 2011 |
| Alarmco Limited | Other services | 2008 |
| Alastair Noyce Ltd | Professional & scientific | 2020 |
| Alba Decor Limited | Construction | 2002 |