| Auchencarroch Energy Limited | Energy | 1999 |
| Auchendrane Estates Limited | Construction | 1945 |
| Auchenflower Investments Limited | Real estate | 2022 |
| Auchenforest Limited | Agriculture & fishing | 1994 |
| Auchmithie Properties Ltd | Real estate | 2024 |
| Auchren Wind Farm Limited | Energy | 2012 |
| Auchrobert Wind Energy Limited | Energy | 2014 |
| Auckinleck Building Company Limited | Construction | 1979 |
| Auckland Trading & Associates | | 1993 |
| Auctoadmin Ltd | Professional & scientific | 2025 |
| Auctoria Private Equity LP | | 2016 |
| Auda Global Partners | | 2006 |
| Auda Global Partners II | | 2007 |
| Audax Consulting Limited | Professional & scientific | 2024 |
| Audbod Ltd | Information & communication | 2021 |
| Audio Dumpling Ltd | Information & communication | 2025 |
| Audio Light Systems Limited | Construction | 2004 |
| Audit Consulting Experts L.P. | | 2010 |
| Audrey Consulting LP | | 2014 |
| Audrey Fitzpatrick Aviation Recruitment Ltd | Administrative & support | 2017 |
| Augereai Ltd | Information & communication | 2025 |
| Augment AI Hub Ltd | Information & communication | 2025 |
| Augmentblu Limited | Information & communication | 2012 |
| Augur Technical LP | | 2016 |
| August Equity Partners GP LLP | | 2012 |
| August Equity Partners I Executives' Partnership | | 2001 |
| August Equity Partners II Executives Partnership LP | | 2007 |
| August Equity Partners II GP LP | | 2007 |
| August Equity Partners III Executives Partnership LP | | 2012 |
| August Equity Partners III GP LP | | 2012 |
| August Equity Partners IV Executives Partnership LP | | 2016 |
| August Equity Partners V Executives Partnership LP | | 2019 |
| August Equity Partners VI Executives Partnership LP | | 2022 |
| August Techonical Limited | Wholesale & retail | 2025 |
| AUK DB Scheme Trustees Limited | Financial services | 2013 |
| Auld Acquaintance Whisky Company Limited | Wholesale & retail | 2018 |
| Auld Jocks Ltd | Hospitality | 2013 |
| Auld Reekie Developments Limited | Real estate | 2015 |
| Auld Reekie RAW Ltd | Wholesale & retail | 2022 |
| Auld Reekie Roller Derby Limited | Arts & recreation | 2011 |
| Auld Reekie Security Limited | Administrative & support | 2017 |
| Auld Reekie Taxis Ltd. | Professional & scientific | 2004 |
| Auld Reekie Tours Limited | Administrative & support | 2012 |
| Auld Town Apartments Ltd | Real estate | 2025 |
| Auld Town Ltd | Hospitality | 2026 |
| Auldearn Trade LP | | 2017 |
| Auldecole Consulting Ltd | Wholesale & retail | 2020 |
| Aultgrishan Ltd | Professional & scientific | 2013 |
| Auquhirie Land Company Limited | Energy | 2006 |
| Aura & Fusion Limited | Wholesale & retail | 2025 |
| Aura Express LP | | 2015 |
| Aura International LP | | 2016 |
| Aura Projects Edinburgh Ltd | Construction | 2024 |
| Aura Steel LP | | 2017 |
| Aura Synergy Ltd | Wholesale & retail | 2025 |
| Aura Wind (Alize) Limited | Energy | 2015 |
| Aura Wind (Hamsin) Limited | Energy | 2015 |
| Auraglow Skincare Ltd | Wholesale & retail | 2018 |
| Auralis Traders Ltd | Wholesale & retail | 2025 |
| Aurasen Forge Ltd | Arts & recreation | 2025 |
| Auratects Ltd | Information & communication | 2020 |
| Auray Business LP | | 2019 |
| Aurea Consulting Limited | Professional & scientific | 2010 |
| Aurea Limited Partnership | | 2003 |
| Aureate Residence Ltd | Real estate | 2026 |
| Aurelaya LP | | 2025 |
| Aurelia Capital International LP | | 2025 |
| Aurelia Environmental Limited | Professional & scientific | 2011 |
| Aurelia Verdant Limited | Real estate | 2025 |
| Aurelie LP | | 2016 |
| Aurelius Treasure Ltd | Wholesale & retail | 2025 |
| Aurent Logistics LP | | 2014 |
| Aureon Consulting Group Limited | Professional & scientific | 2026 |
| Aureon Consulting Limited | Professional & scientific | 2025 |
| Aurevia Solutions Ltd | Wholesale & retail | 2026 |
| Aurexion ZEN Ltd | Wholesale & retail | 2026 |
| Auric Enterprises Limited | Real estate | 2019 |
| Auriga Partners Ltd | Administrative & support | 2019 |
| Aurion Media Ltd | Information & communication | 2026 |
| Auris Homes Limited | Real estate | 2026 |
| Aurnia Corporation LP | | 2014 |
| Auro Universal Music LP | | 2022 |
| Auromix Ltd | Information & communication | 2026 |
| Aurora (Scotland) Limited | Professional & scientific | 2024 |
| Aurora Alarms Ltd | Professional & scientific | 2026 |
| Aurora Alliance LP | | 2015 |
| Aurora Arts Studio Ltd | Education | 2025 |
| Aurora Asset Management Ltd | Professional & scientific | 2018 |
| Aurora Avionics Ltd | Manufacturing | 2023 |
| Aurora Books Limited | Real estate | 2002 |
| Aurora Direct LP | | 2015 |
| Aurora Expert LP | | 2015 |
| Aurora Heating Limited | Construction | 2011 |
| Aurora Invest LP | | 2016 |
| Aurora Maritime LP | | 2016 |
| Aurora Mission LP | | 2016 |
| Aurora Top LP | | 2015 |
| Aurora Trans LP | | 2015 |
| Aurora Travel Ltd | Administrative & support | 2015 |
| Aurora Umbrella Group Ltd | Professional & scientific | 2025 |