| Aspire Bidding Ltd | Professional & scientific | 2025 |
| Aspire Fitout Limited | Construction | 2025 |
| Aspire FOX Ltd | Manufacturing | 2024 |
| Aspire Property (Scotland) Ltd | Real estate | 2024 |
| Aspire Property Management Group Ltd | Real estate | 2025 |
| Aspire Search Consultants LLP | | 2017 |
| Aspire Trade Services Limited | Construction | 2015 |
| Aspire Wealth Management Limited | Financial services | 2006 |
| Aspiro Ltd | Information & communication | 2015 |
| Aspishire Estate LP | | 2011 |
| Aspo Trade LP | | 2017 |
| Asqueta Capital LP | | 2012 |
| ASR Management International Ltd | Professional & scientific | 2022 |
| Asrad Limited | Health & social care | 2022 |
| Assel Valley Wind Energy Limited | Energy | 2013 |
| Assembly Festival Limited | Arts & recreation | 2013 |
| Assembly Theatre Limited | Arts & recreation | 1985 |
| Assenta Limited | Professional & scientific | 2001 |
| Assenta Rail Limited | Professional & scientific | 2016 |
| Asset Century LP | | 2015 |
| Asset Company & Co | | 2007 |
| Asset House Piccadilly Ltd | Administrative & support | 1998 |
| Asset Manage Ability Limited | Professional & scientific | 2012 |
| Asset Save LP | | 2015 |
| Assets & Finance LP | | 2013 |
| Assets Pact Ltd | Financial services | 2020 |
| Assha Retail Solutions Ltd | Wholesale & retail | 2025 |
| Assiduous-It Ltd | Information & communication | 2012 |
| Assignac Limited | Administrative & support | 2023 |
| Assisted Intelligence Ltd | Manufacturing | 2024 |
| Associated Property Returns Ltd | Real estate | 2019 |
| Associated Seafoods Limited | Professional & scientific | 2009 |
| Association of Coordinators for Erasmus+ UK Ltd | Education | 2026 |
| Association of Hackney Carriage Drivers of the City of Edinburgh CIC | Transport & logistics | 2024 |
| Association of Professional Accountants and Auditors | Education | 2025 |
| Assos Tech Limited | Mining & quarrying | 2014 |
| Assou Trade Ltd | Professional & scientific | 2026 |
| Assura Aberdeen SLP | | 2009 |
| Assura Inverness SLP | | 2009 |
| Assure APM Limited | Information & communication | 2014 |
| Assured Cars Scotland Limited | Wholesale & retail | 2021 |
| Assured Process Management Limited | Education | 2016 |
| Assured Transport Scotland Limited | Transport & logistics | 2020 |
| Assynt Trading Company Limited | Wholesale & retail | 2010 |
| AST and Red Ltd | Information & communication | 2012 |
| AST Global Solutions Limited | Real estate | 2026 |
| Asta Corporation LP | | 2014 |
| Asta Holdings LP | | 2015 |
| Astaire & Davis LP | | 2014 |
| Astars Promotion LP | | 2020 |
| Astaurias Limited | Real estate | 2025 |
| Astb Networks Limited | Professional & scientific | 2013 |
| Astedfarma Solutions Limited | Professional & scientific | 2021 |
| Astello Software Solutions Ltd | Extraterritorial | 2024 |
| Asteri Associates Ltd | Information & communication | 2019 |
| Asteri Consultancy Limited | Information & communication | 2013 |
| Asteria Business Consulting Ltd | Professional & scientific | 2025 |
| Asterion Films Limited | Information & communication | 2023 |
| Asterix Partners LP | | 2014 |
| Astero Alliance LP | | 2018 |
| Asterope Telecom LP | | 2018 |
| Astex Limited | Education | 2010 |
| Astix LP | | 2014 |
| Astoler Trade LP | | 2011 |
| Aston Global L.P. | | 2010 |
| Aston James Consulting (UK) Limited | Professional & scientific | 2024 |
| Aston Today LP | | 2016 |
| Astonleigh Invest LP | | 2011 |
| Astor Impex LP | | 2016 |
| Astor Manor Limited | Wholesale & retail | 2016 |
| Astoria Edinburgh Limited | Wholesale & retail | 2020 |
| Astoria Export LP | | 2012 |
| Astra Capital L.P. | | 2011 |
| Astra Commercial LP | | 2017 |
| Astra Europe L.P. | | 2014 |
| Astra Global LP | | 2016 |
| Astra Invest LP | | 2015 |
| Astra Trading LP | | 2014 |
| Astra Valor LP | | 2023 |
| Astraa Innovations Ltd | Information & communication | 2026 |
| Astrade Solutions LP | | 2013 |
| Astraeus III FP LP | | 2021 |
| Astralis Limited | Professional & scientific | 1999 |
| Astras Group LP | | 2016 |
| Astrea II L.P. | | 2014 |
| Astro Support LP | | 2013 |
| Astro's Pizza Company Limited | Manufacturing | 2025 |
| Astroagency Limited | Professional & scientific | 2019 |
| Astrobridge L.P. | | 2014 |
| Astrocord L.P. | | 2011 |
| Astrogold L.P. | | 2013 |
| Astrol Global LP | | 2017 |
| Astron Global LP | | 2017 |
| Astronik Impacts LP | | 2015 |
| Astropark Corp LP | | 2012 |
| Asturval Financial Advisors LP | | 2016 |
| Astute European LP | | 2016 |
| ASY Garden Services Ltd | Administrative & support | 2022 |
| Asygor LLP | | 2013 |
| Asymlab Ltd | Information & communication | 2026 |