| ACS Accident Claims Scotland Ltd | Administrative & support | 2017 |
| ACS Aviation Limited | Manufacturing | 2007 |
| Acsg Electrical Ltd | Construction | 2024 |
| Action Location Limited | Professional & scientific | 2019 |
| AD Deliveries Ltd | Other services | 2025 |
| AD PUB Co Ltd | Hospitality | 2016 |
| Adalec Ltd | Manufacturing | 2020 |
| Adam (Bearsden) Limited | Administrative & support | 2018 |
| Adam (Scotland) Limited | Construction | 2011 |
| Adam Gray Electrical Ltd | Construction | 2024 |
| Adam Holdings (Scotland) Limited | Construction | 2017 |
| Adam International Ltd | Wholesale & retail | 2016 |
| Adam Millar & Sons Ltd. | Manufacturing | 2003 |
| Adams Global Academy Ltd | Education | 2025 |
| Adamsehab Ltd | Real estate | 2026 |
| ADD Architecture Limited | Professional & scientific | 2024 |
| Addkip Limited | Real estate | 1987 |
| Addyson Limited | Construction | 2022 |
| ADE Consulting Services Ltd | Professional & scientific | 2024 |
| ADF Maintenance and Management Ltd | Construction | 2026 |
| Admiral 1312 Limited | Hospitality | 2023 |
| Adom Afrofood Limited | Wholesale & retail | 2020 |
| Adonai Bible Church | Other services | 2007 |
| Adore Paisley Limited | Other services | 2025 |
| ADR Mechanical Ltd | Construction | 2024 |
| Advanced Contracts UK Limited | Construction | 2017 |
| Advanced Financial Strategies Limited | Financial services | 2006 |
| Advancedlaserscotland Ltd | Other services | 2026 |
| Adventure MAP Ltd | Information & communication | 2022 |
| Adverteese.Com Ltd | Professional & scientific | 2025 |
| ADZ Enterprises Ltd | Real estate | 2024 |
| Aesthetox (Scotland) Ltd | Other services | 2018 |
| Afcustoms Ltd | Wholesale & retail | 2025 |
| Affordable Airport Transfers Limited | Transport & logistics | 2019 |
| Affordable Heating Ltd | Manufacturing | 2023 |
| Affordable Luxuries Ltd. | Wholesale & retail | 2004 |
| AFG Khan Ltd | Hospitality | 2023 |
| Africano Restaurant Limited | Hospitality | 2019 |
| Afro-Scot Group Ltd | Hospitality | 2026 |
| Agilelurd Limited | Information & communication | 2023 |
| Agrimed (Scotland) Ltd. | Agriculture & fishing | 1998 |
| AHB Finance & Consultancy Ltd. | Professional & scientific | 2013 |
| Ahmed Global Ventures Ltd | Wholesale & retail | 2025 |
| AHP Tiling Ltd | Construction | 2018 |
| AHR Investments One Ltd | Financial services | 2020 |
| AI Business Group Ltd | Information & communication | 2026 |
| AI Leasing One Ltd | Administrative & support | 2026 |
| Aillum Limited | Information & communication | 2010 |
| AIQ Grub Hub Ltd | Hospitality | 2025 |
| Air Sea Scotland Limited | Transport & logistics | 1986 |
| Aj-Swift Cleaning Services Ltd | Administrative & support | 2026 |
| Ajahs Ltd | Construction | 2013 |
| AJK (Scotland) Ltd | Hospitality | 2022 |
| AJM Landscaping Limited | Construction | 2025 |
| AJP Accountants Ltd | Professional & scientific | 2025 |
| AJR Joiners (Scotland) Ltd | Construction | 2017 |
| AJS Construction (Scotland) Limited | Construction | 2025 |
| AK Barber 35 Ltd | Other services | 2026 |
| AK Vehicle Rental Limited | Administrative & support | 1990 |
| AKG Multico Ltd. | Professional & scientific | 2016 |
| Akwa Ibom State Association of Nigeria - Akisan UK. Ltd | Administrative & support | 2023 |
| Al-Hajaj Ltd | Health & social care | 2022 |
| Alan Brown Engineering Solutions Limited | Professional & scientific | 2015 |
| Alan Neilston Ltd | Wholesale & retail | 2025 |
| Alan's Turkish Barber Ltd | Other services | 2023 |
| Albany Trade Limited | Wholesale & retail | 2021 |
| Albex Group Services Limited | Professional & scientific | 2023 |
| Albex Logistics Limited | Transport & logistics | 2025 |
| Albion MC Ltd | Hospitality | 2023 |
| Albis Care Limited | Health & social care | 2024 |
| ALC Property Holdings Limited | Real estate | 2024 |
| Ales Retail Limited | Wholesale & retail | 2025 |
| Alex Mackay (Printers and Stationers) Limited | Manufacturing | 1967 |
| Alexander Leonard Limited | Construction | 1973 |
| Alexander Stoddart Ltd | Professional & scientific | 2014 |
| Alexander Wood Accountants & Co Limited | Professional & scientific | 2010 |
| Alexander Wood Community Food Resources CIC | Hospitality | 2022 |
| ALI Baba Paisley Ltd | Hospitality | 2022 |
| Alif YA Limited | Information & communication | 2025 |
| Aligned Holdings (U.K.) Limited | Extraterritorial | 2017 |
| Alisan Care Ltd | Health & social care | 2023 |
| Alisha Properties Ltd | Real estate | 2012 |
| Alisha Training Limited | Other services | 2014 |
| Alistair Brown Limited | Professional & scientific | 2003 |
| Alizarin Ltd | Arts & recreation | 2023 |
| ALL Areas Scaffolding Solutions Ltd | Construction | 2026 |
| ALL KEG Managed Houses Limited | Hospitality | 2026 |
| ALL Occasions Catering & Events Ltd | Hospitality | 2019 |
| ALL OUT Physiotherapy Limited | Health & social care | 2024 |
| ALL Piping Xplored Ltd | Construction | 2024 |
| ALLCARE365 Ltd | Health & social care | 2023 |
| Allglass Reprocessors (U.K.) Limited | Manufacturing | 2001 |
| Alliance for Active Community (A4AC) C.I.C. | Other services | 2024 |
| Alliance Venture Project Limited | Extraterritorial | 2005 |
| Alloway Homes Ltd | Real estate | 2018 |
| Alloway Motors Ltd | Real estate | 2017 |
| Allstaff EOT Trustees Limited | Financial services | 2023 |
| Allstaff Group Limited | Financial services | 2008 |
| Allstaff Limited | Extraterritorial | 1985 |
| Allstaff Solutions Limited | Financial services | 2018 |