| A.H.A. (AYR) Limited | Real estate | 2025 |
| A.H.N.Construction Ltd | Administrative & support | 2016 |
| A.I. (Edinburgh) Limited | Health & social care | 2018 |
| A.I. (North) Limited | Health & social care | 2018 |
| A.I.D. Healthcare Ltd | Health & social care | 2026 |
| A.J Blue Nile Ltd | Other services | 2020 |
| A.J.N Properties (Scotland) Ltd | Real estate | 2019 |
| A.J.P Estates Limited | Real estate | 2005 |
| A.K.I. E&I Design Limited | Professional & scientific | 2023 |
| A.L.A Newsagent Ltd | Wholesale & retail | 2019 |
| A.L.B Newsagent Limited | Wholesale & retail | 2025 |
| A.L.G.P. Century LP | | 2017 |
| A.M.I. Development and Lettings Limited | Real estate | 2005 |
| A.M.J Kennedy E,I&C Ltd | Administrative & support | 2026 |
| A.M.Land PTE Limited | Real estate | 2023 |
| A.Mmassages Ltd | Health & social care | 2025 |
| A.N. Furnishings Limited | Wholesale & retail | 2016 |
| A.N. Scottish Commercials Limited | Wholesale & retail | 2018 |
| A.P-E Training Systems Ltd | Arts & recreation | 2022 |
| A.P.C.P Immobiliare Ltd | Real estate | 2022 |
| A.Powell Joinery Ltd | Construction | 2023 |
| A.R.K Scottish Real Estate Limited | Administrative & support | 2025 |
| A.R.K Talent Solutions Ltd | Administrative & support | 2024 |
| A.R.T. - Ayrshire Recruitment & Training Ltd | Education | 2022 |
| A.S. Homes (Scotland) Limited | Construction | 2010 |
| A.S. Real Estate Developments Ltd | Real estate | 2020 |
| A.S. Scaffolding (Services) Ltd. | Construction | 2004 |
| A.S.A Universal Limited | Wholesale & retail | 2024 |
| A.S.B. (Engineers) Limited | Manufacturing | 1988 |
| A.S.G. Tunnelling & Civil Engineering Limited | Mining & quarrying | 1998 |
| A.S.K. Wealth Management LLP | | 2016 |
| A.T. Engineering (Propshafts) Ltd. | Administrative & support | 2000 |
| A.Thomas Properties Ltd | Construction | 2019 |
| A.U.L.M. Limited | Wholesale & retail | 2010 |
| A.U.U. Realisations Limited | Information & communication | 1985 |
| A.V.A Developments Scotland Ltd | Construction | 2018 |
| A.W.M Electrical Ltd | Construction | 2005 |
| A.Winston & Sons Ltd | Wholesale & retail | 2013 |
| A.Z.E. Holdings Limited | Health & social care | 2018 |
| A1 Assets Glasgow Limited | Real estate | 2022 |
| A1 Auto Claims Ltd | Wholesale & retail | 2020 |
| A1 Automatic Gates Limited | Construction | 2014 |
| A1 Barbers Limited | Other services | 2014 |
| A1 Car Body Repairs Limited | Wholesale & retail | 2003 |
| A1 Car Care 2U Ltd | Wholesale & retail | 2026 |
| A1 Chauffeur Limited | Transport & logistics | 2026 |
| A1 Chiro Holdings Ltd | Real estate | 2021 |
| A1 Chiro Ltd | Health & social care | 2009 |
| A1 City Properties Ltd | Real estate | 2017 |
| A1 Dance Company Limited | Education | 2026 |
| A1 Deco Limited | Construction | 2019 |
| A1 Domestic Services Ltd | Construction | 2021 |
| A1 Electrical Services (EK) Limited | Construction | 2008 |
| A1 Fire Protection Engineers Limited | Public administration | 2007 |
| A1 Joiners Limited | Construction | 2006 |
| A1 Legal Consultancy Limited | Administrative & support | 2025 |
| A1 Maintenance Scotland Ltd | Construction | 2024 |
| A1 Motors (Scotland) Limited | Wholesale & retail | 2013 |
| A1 Plumbing, Heating & Trades Ltd | Construction | 2024 |
| A1 Productions LLP | | 2016 |
| A1 Properties (Scotland) Ltd | Real estate | 2016 |
| A1 Property Law Ltd | Professional & scientific | 2024 |
| A1 Property Scotland Ltd | Households | 2024 |
| A1 Racking and Shelving Ltd | Transport & logistics | 2023 |
| A1 Renewables Ltd | Construction | 2024 |
| A1 SEO Glasgow Limited | Information & communication | 2021 |
| A1 SEO Limited | Extraterritorial | 2021 |
| A1 Transport and Distribution Ltd | Transport & logistics | 2009 |
| A1 Tyres (Scotland) Ltd. | Wholesale & retail | 2007 |
| A1 Uplifts Ltd | Water & waste | 2014 |
| A1 Window Cleaners (Ayrshire) Ltd | Other services | 2019 |
| A1-TEN Company Ltd | Professional & scientific | 2015 |
| A11D Ltd | Professional & scientific | 2026 |
| A12 Group Limited | Real estate | 2023 |
| A15HAQ Ltd | Health & social care | 2019 |
| A1A Chiro Limited | Health & social care | 2014 |
| A1STAKEZ Ltd | Information & communication | 2026 |
| A2 Trading Scotland Ltd | Wholesale & retail | 2022 |
| A2 Transport Logistics Ltd | Transport & logistics | 2025 |
| A2 Wash Ltd | Extraterritorial | 2021 |
| A2-Z Private Healthcare Limited | Wholesale & retail | 2018 |
| A21 Building and Electrical Services Limited | Construction | 2022 |
| A22 Electrical Ltd | Construction | 2025 |
| A2B Access and Inspection Ltd | Professional & scientific | 2018 |
| A2B Ayrshire Ltd | Administrative & support | 2025 |
| A2B Electrical Services (Scotland) Ltd | Construction | 2017 |
| A2B Logistics Glasgow Limited | Transport & logistics | 2024 |
| A2B Logistix Ltd | Transport & logistics | 2026 |
| A2B Networks Ltd | Professional & scientific | 2021 |
| A2B Unrivalled Ltd | Transport & logistics | 2025 |
| A2BAJO Enterprise Ltd | Information & communication | 2026 |
| A2BETA Limited | Professional & scientific | 2024 |
| A2C Scotland Ltd | Wholesale & retail | 2026 |
| A2J Hospitality Ltd | Hospitality | 2026 |
| A2J Marketing & Consultation Ltd | Professional & scientific | 2026 |
| A2Z Bathroom Limited | Wholesale & retail | 2024 |
| A2Z IT & Management Ltd | Professional & scientific | 2014 |
| A2Z Tech Traders Limited | Wholesale & retail | 2018 |
| A3 Holdings Ltd | Real estate | 2020 |
| A3 Landscaping & Stonework Ltd | Construction | 2022 |