| Aldea Bella (NO 34) Limited | Professional & scientific | 1984 |
| Alex Young Bakers Limited | Wholesale & retail | 2023 |
| Alexander Surgery Limited | Health & social care | 2011 |
| Algiz Limited | Professional & scientific | 2001 |
| Alhambra Cafe Ltd. | Hospitality | 2009 |
| ALI Properties (Leicester) Ltd | Real estate | 2017 |
| Alihaf Ltd | Real estate | 2026 |
| Alisha Homes Ltd | Real estate | 2024 |
| Alison Black Limited | Wholesale & retail | 1998 |
| Alistair Electrical Holdings Ltd | Financial services | 2019 |
| Alistair Electrical Limited | Construction | 2019 |
| ALL Body ALL Limited | Wholesale & retail | 2022 |
| Allan Butler Creative Design Ltd | Professional & scientific | 2008 |
| Allanshaw Accountancy Services Ltd | Professional & scientific | 2016 |
| Allanshaw Consultancy Limited | Professional & scientific | 2019 |
| Allerdice Project Management Limited | Professional & scientific | 2025 |
| Allium Property Ltd | Real estate | 2018 |
| Alndoor Ltd | Construction | 2025 |
| Alpha Electrical Lanarkshire Ltd | Construction | 2025 |
| Alpha Inspection Services Ltd | Professional & scientific | 2010 |
| Alpha Nexus Trading Ltd | Wholesale & retail | 2026 |
| Alpha-Beta Signs Ltd | Professional & scientific | 2002 |
| Alphamise Ltd | Professional & scientific | 2021 |
| Altius Rentals Limited | Real estate | 2019 |
| Altus Properties Limited | Real estate | 2016 |
| ALV Private Care Ltd | Health & social care | 2023 |
| Alvaroflas Ltd | Health & social care | 2023 |
| Always Bounce Back Network Ltd | Professional & scientific | 2025 |
| Always Trying Ltd | Professional & scientific | 2010 |
| AM Laser Clinic Ltd | Other services | 2025 |
| AM Opex Consultancy Ltd | Professional & scientific | 2026 |
| Amac Facilities Cctv Ltd | Other services | 2020 |
| Amarri Frizzante Limited | Wholesale & retail | 2016 |
| Amasrv Ltd | Professional & scientific | 2025 |
| Ambe Care Ltd | Health & social care | 2023 |
| Amber Nominees Limited | | 2023 |
| Amcdtechs Ltd | Professional & scientific | 2025 |
| Amexx UK Properties Ltd | Administrative & support | 2018 |
| AMI Hamilton Limited | Financial services | 2024 |
| Amicable Industrial Services Ltd | Professional & scientific | 2016 |
| Amierin Limited | Real estate | 2021 |
| Amir Retail Ltd | Wholesale & retail | 2019 |
| AMJ Chiro Ltd | Health & social care | 2023 |
| Amor Projects Ltd | Professional & scientific | 2023 |
| AN Sealladh Holdings Limited | Financial services | 2025 |
| Anasha Ventures Ltd | Hospitality | 2017 |
| Anayeza E-Commerce Limited | Wholesale & retail | 2025 |
| Anci Retail Group Ltd | Wholesale & retail | 2024 |
| Anderson Morrison Ltd | Real estate | 2025 |
| Anderson Mortgages (Scotland) Limited | Professional & scientific | 2021 |
| Anderson Property Services (Scotland) Limited | Construction | 2009 |
| Andrew MB Salon Limited | Administrative & support | 2017 |
| Andrew P Connell Ltd | Health & social care | 2024 |
| Andy Hamilton Photography Limited | Professional & scientific | 2025 |
| Aneil Malhotra Ltd | Health & social care | 2017 |
| Angels Home Care Lanarkshire Ltd | Health & social care | 2015 |
| Anji Mcmullen Property Limited | Real estate | 2021 |
| Anjomedia Limited | Professional & scientific | 2010 |
| Anna Maintenance Ltd | Construction | 2020 |
| Annapurna Cuisine Ltd | Hospitality | 2024 |
| Anroy Investments Ltd | Real estate | 2025 |
| Antco Logistics Limited | Transport & logistics | 2020 |
| Anthouse Ltd | Real estate | 2016 |
| Anthropometric Ltd | Information & communication | 2024 |
| Antorium Ltd | Professional & scientific | 2024 |
| Anywhere the Wind Blows Ltd | Construction | 2022 |
| Apex Bespoke Joinery Ltd | Construction | 2025 |
| Apex Electrical Solutions Ltd | Construction | 2018 |
| Apex Fitness Pro Limited | Arts & recreation | 2024 |
| Apex Hamilton Limited | Wholesale & retail | 2025 |
| API Technical (Electrical) Ltd | Construction | 2018 |
| API Technical Ltd | Construction | 2018 |
| APL Star Industries Ltd | Real estate | 2026 |
| Aplstar Ltd | Health & social care | 2024 |
| Apollo Blinds (Hamilton) Ltd | Wholesale & retail | 2007 |
| Apollo International Holdings Ltd. | | 2020 |
| Applebank Inn 39 Limited | Hospitality | 2025 |
| Approved Motor Brokerage Ltd | Wholesale & retail | 2026 |
| Apps for Education Ltd | Professional & scientific | 2016 |
| Apps Scotland Ltd | Professional & scientific | 2010 |
| APS Home Assure Ltd | Construction | 2020 |
| Apsis AI Ltd | Information & communication | 2023 |
| Apsis Business Components Ltd. | Information & communication | 2010 |
| Apsis Commercial Developments Ltd. | Administrative & support | 2013 |
| Apsis Homes (Ashcraig) Ltd | Construction | 2021 |
| Apsis Homes (Glasgow North) Ltd | Construction | 2017 |
| Apsis Project Management Ltd. | Construction | 2012 |
| Apsis Solutions (Construction) Ltd | Construction | 2012 |
| Apsis Solutions (Holdings) Limited | Financial services | 2010 |
| Apsp Group Ltd | Financial services | 2020 |
| AQP Planning Ltd | Professional & scientific | 2026 |
| Aqua Church Ltd | Real estate | 2022 |
| Aqualogical Limited | Professional & scientific | 2025 |
| Aquarelle Home Ltd | Wholesale & retail | 2023 |
| Aquarelle Interior Decor Ltd | Manufacturing | 2018 |
| Aquariass Limited | Wholesale & retail | 2020 |
| Aquarius Creative Scotland Limited | Professional & scientific | 2020 |
| Aquarius Creative Social Limited | Professional & scientific | 2022 |
| Aquatech Engineering (Scotland) Limited | Administrative & support | 2016 |
| Aquatek Pipe Services Limited | Professional & scientific | 2010 |