| Alexander Macdougall & Company (Engineers) Limited | | 1951 |
| Alexander Maritime Ltd. | Transport & logistics | 2004 |
| Alexander Mcfarlane & Company Limited | Construction | 1995 |
| Alexander Muir & SON Limited | Wholesale & retail | 1993 |
| Alexander Oastler Limited | Professional & scientific | 2004 |
| Alexander OIL and GAS Solutions Ltd | Mining & quarrying | 2025 |
| Alexander Park Property Group Ltd | Real estate | 2017 |
| Alexander PM Ltd. | Other services | 2011 |
| Alexander Pringle Engineering Solutions Limited | Construction | 2017 |
| Alexander Ross Investment Group Limited | Administrative & support | 2017 |
| Alexander Scott Oils Ltd | Water & waste | 2012 |
| Alexander Stephen & Sons Limited | | 1900 |
| Alexander Stewart & Sons Ltd. | Hospitality | 2019 |
| Alexander Watt (Contracting) Ltd | Agriculture & fishing | 2016 |
| Alexander Wines Ltd. | Wholesale & retail | 2012 |
| Alexanderam Lettings Ltd | Real estate | 2026 |
| Alexanders Cleaning Solutions Ltd | Administrative & support | 2024 |
| Alexandra Apartments Grangemouth Ltd | Real estate | 2021 |
| Alexandra Autos Ltd | Construction | 2023 |
| Alexandra Childcare Limited | Education | 2017 |
| Alexandra Gate Properties Limited | Real estate | 2005 |
| Alexandra Grace Ltd | Real estate | 2022 |
| Alexandra Leisure Retail Limited | Hospitality | 2024 |
| Alexandra Park Food Forest C.I.C. | Agriculture & fishing | 2017 |
| Alexandra Park Land Limited | Agriculture & fishing | 2025 |
| Alexandria Healthcare Ltd | Administrative & support | 2021 |
| Alexd Limited | Information & communication | 2015 |
| Alexgate Contracts Ltd | Professional & scientific | 2023 |
| Alexnem Limited | Health & social care | 2015 |
| Alextikta Limited | Health & social care | 2025 |
| ALF Engineering Ltd | Professional & scientific | 2021 |
| ALF Property Ltd | Financial services | 2024 |
| ALF87 Ltd | Hospitality | 2025 |
| Alfa Consulting L.P. | | 2015 |
| Alfa Nest Ltd | Wholesale & retail | 2026 |
| Alfa Property Investments (Scotland) Ltd | Real estate | 2019 |
| Alfa Shipping Services Limited | Transport & logistics | 2006 |
| Alfa Western Company Ltd | Other services | 2017 |
| Alfalaah Scotland | Education | 2021 |
| Alfares Translation Ltd | Professional & scientific | 2023 |
| Alfasystem L.P. | | 2017 |
| Alfatel Properties L.P. | | 2016 |
| Alfervet Neurologia Ltd | Professional & scientific | 2026 |
| Alfi's Properties Ltd | Construction | 2025 |
| Alfie Project Controls Ltd | Construction | 2016 |
| Alfitwa Ltd | Wholesale & retail | 2023 |
| Alfor Construction Ltd | Professional & scientific | 2024 |
| Alford FE Limited | Professional & scientific | 2015 |
| Alford FR Limited | Professional & scientific | 2015 |
| Alfort LP | | 2015 |
| Alfram Solutions Ltd | Information & communication | 2019 |
| Algebra (Dundonald) Limited | Construction | 2006 |
| Algebraic Technologies Ltd | Professional & scientific | 2022 |
| Algerscot Global Trading Ltd | Wholesale & retail | 2025 |
| Alghad Limited | Hospitality | 2022 |
| Alghani Enterprises Ltd | Wholesale & retail | 2024 |
| Algl Management Limited | Professional & scientific | 2025 |
| Algo AV Limited | Construction | 2024 |
| Algogator Ltd | Information & communication | 2023 |
| Algorit Ltd | Information & communication | 2023 |
| Algosus Limited | Professional & scientific | 2026 |
| Alhambra Leisure Ltd | Other services | 2014 |
| Alhasso Oncology Ltd. | Health & social care | 2010 |
| Alhayat Trading Limited | Wholesale & retail | 2021 |
| ALI & ALI (Property) Ltd | Construction | 2016 |
| ALI & Associates Ltd | Real estate | 2014 |
| ALI & Naqvi Investments Limited | Wholesale & retail | 2018 |
| ALI & Sons (Cambuslang) Limited | Wholesale & retail | 2021 |
| ALI & Sons (Grocers) Limited | Wholesale & retail | 2026 |
| ALI & Sons (Scotland) Limited | Wholesale & retail | 2015 |
| ALI & Sons (Southside) Limited | Wholesale & retail | 2022 |
| ALI & Sons Oatlands Limited | Wholesale & retail | 2019 |
| ALI & Sons Properties Limited | Real estate | 2005 |
| ALI Akhtar Bros Limited | Wholesale & retail | 2016 |
| ALI Amra Ltd | Real estate | 2023 |
| ALI and Associates Accountants Ltd | Professional & scientific | 2023 |
| ALI Auto Motors Ltd | Wholesale & retail | 2024 |
| ALI Baran Barbers Ltd | Other services | 2023 |
| ALI Bros Group Ltd | Real estate | 2025 |
| ALI Driving School Limited | Education | 2022 |
| ALI Groceries Ltd | Wholesale & retail | 2022 |
| ALI H Advisors Ltd | Professional & scientific | 2025 |
| ALI Holdings Ltd | Real estate | 2021 |
| ALI Imran Multimedia Services Limited | Professional & scientific | 2024 |
| ALI Inc Ltd | Professional & scientific | 2021 |
| ALI IT Solutions Ltd | Information & communication | 2024 |
| ALI Law Ltd | Professional & scientific | 2023 |
| ALI MAC Ltd | Information & communication | 2020 |
| ALI News Store Ltd | Wholesale & retail | 2021 |
| ALI Newsagent Ltd | Wholesale & retail | 2021 |
| ALI TOD Financial Services Ltd | Administrative & support | 2016 |
| ALI Walker Ltd | Professional & scientific | 2018 |
| Ali's Food Limited | Hospitality | 2017 |
| Ali-Ce EXP Ltd | Hospitality | 2019 |
| Ali-Gn Smiles Limited | Health & social care | 2020 |
| Aliado Supply Ltd | Other services | 2023 |
| Aliamar Ltd | Wholesale & retail | 2025 |
| Aliao Group Ltd | Information & communication | 2024 |
| Aliao Ltd | Wholesale & retail | 2018 |
| Alice Come Home Limited | Information & communication | 2024 |