| Arbor Green Nursery Limited | Education | 2009 |
| Arbor Mill Limited | Real estate | 2019 |
| Arbor Partners | | 1999 |
| Arboretum Capital Holdings Ltd | Financial services | 2025 |
| Arboretum Training Ltd | Professional & scientific | 2025 |
| Arbroath NET Zero Ltd | Energy | 2023 |
| Arbuthnot Holdings Limited | Administrative & support | 1981 |
| Arbuthnot SLP | | 1996 |
| ARC Business Consulting Limited | Professional & scientific | 2004 |
| ARC Developments (Edin) Ltd | Construction | 2024 |
| ARC NET Scotland Ltd | Information & communication | 2015 |
| ARC Potential Limited | Administrative & support | 2025 |
| ARC Properties (SCO) Ltd | Construction | 2025 |
| ARC Services (Scotland) Limited | | 2006 |
| ARC Sports Services LP | | 2017 |
| ARC Storage Services Limited | Transport & logistics | 2024 |
| ARC53 Ltd | Information & communication | 2019 |
| Arca LP | | 1999 |
| Arcada Shipping LP | | 2017 |
| Arcade Bar Haggis and Whisky House Ltd | Hospitality | 2019 |
| Arcadedinburgh Ltd | Hospitality | 2026 |
| Arcadia Caribbean LP | | 2015 |
| Arcadia Cigars Edinburgh Limited | Extraterritorial | 2024 |
| Arcadia Invest LP | | 2015 |
| Arcado Business Global LP | | 2015 |
| Arcado Business LP | | 2014 |
| Arcado Elegant LP | | 2015 |
| Arcado Global LP | | 2015 |
| Arcado Intershores LP | | 2012 |
| Arcado Marketing Global LP | | 2015 |
| Arcado Trading LP | | 2015 |
| Arcado Trans LP | | 2015 |
| Arcado Union LP | | 2015 |
| Arcana Art Ltd | Wholesale & retail | 2023 |
| Arcana Skin Ltd | Manufacturing | 2020 |
| Arcanix Ltd | Information & communication | 2023 |
| Arcapela LP | | 2015 |
| Arcata Accountancy Services Limited | Professional & scientific | 2018 |
| Arcata Contract Services Limited | Professional & scientific | 2018 |
| Arcata Holdings Limited | Financial services | 2021 |
| Arcata Limited | Professional & scientific | 2003 |
| Arch Electrics Ltd | Construction | 2015 |
| Arch Fifteen Limited | Hospitality | 2015 |
| Archangel Informal Investment Limited | Extraterritorial | 2014 |
| Archangel Investors (Management) Limited | Financial services | 2014 |
| Archangel Investors Limited | Administrative & support | 2000 |
| Archangelum Ltd | Administrative & support | 2020 |
| Archard SLP | | 1998 |
| Archer III Holding LP | | 2025 |
| Archer Worldwide L.P. | | 2014 |
| Archerfield & Fidra Golf Courses Limited | Arts & recreation | 2003 |
| Archerfield Apartments Limited | Construction | 2023 |
| Archerfield House Hotel Management Limited | Hospitality | 2004 |
| Archersoft Technologies Limited | Information & communication | 2019 |
| Archeus Consultants Ltd | Information & communication | 2024 |
| Archibald & Macnab Properties Ltd | Real estate | 2023 |
| Archibald Architects Limited | Professional & scientific | 2021 |
| Archibald Bennet & Co Limited | | 1946 |
| Archibald Campbell Hope & King Limited | Extraterritorial | 1965 |
| Archibald Investments Ltd | Real estate | 2022 |
| Archibald Marckay Ltd. | Administrative & support | 2011 |
| Archie Thorburn Ltd | Construction | 2018 |
| Archipelago Artisan Bakery Limited | Manufacturing | 2013 |
| Archipelago Property Investments Ltd | Real estate | 2019 |
| Archipelago Provisions Limited | Wholesale & retail | 2020 |
| Archipelagos Labs Ltd | Information & communication | 2023 |
| Archis Marketing Limited | Professional & scientific | 2024 |
| Archismart LP | | 2016 |
| Architech & Design Ltd | Professional & scientific | 2021 |
| Architeco Limited | Professional & scientific | 2014 |
| Architects Designworks Ltd | Professional & scientific | 2026 |
| Architectural & Management Services Limited | Professional & scientific | 1995 |
| Architectural Building Design Consultants Ltd | Professional & scientific | 2016 |
| Architectural Design Paisley Limited | Construction | 2023 |
| Architectural Outfitting Solutions Ltd | Mining & quarrying | 2024 |
| Architecture and Design Scotland | Public administration | 2004 |
| Architecture Office Limited | Professional & scientific | 2020 |
| Architecture, Building and Sales Consulting Inc. | | 2007 |
| Archo Build Ltd | Construction | 2025 |
| Archwill Bloodstock Limited | Agriculture & fishing | 2020 |
| Archy 3D LP | | 2024 |
| Arcinvest Asset Management Limited | Real estate | 2023 |
| Arcinvest Property Limited | Real estate | 2023 |
| Arco Capital LP | | 2015 |
| Arco Home Improvements Ltd | Construction | 2025 |
| Arcobaleno Inter LP | | 2013 |
| Arcozar LP | | 2015 |
| Arcproperty Management & Lettings Ltd | Real estate | 2024 |
| Arcryss Consulting Limited | Professional & scientific | 2019 |
| Arctech Innovation Limited | Extraterritorial | 2026 |
| Arctic FOX Refrigeration Limited | Manufacturing | 2005 |
| Arctic Infrastructure SLP LP | | 2022 |
| Arcus Elegant LP | | 2017 |
| ARD Muir Engineering Limited | Professional & scientific | 2011 |
| Ardbeg Distillery Limited | Manufacturing | 1918 |
| Ardblair Guest House Ltd | Hospitality | 2011 |
| Arden Landscape Architecture Ltd | Professional & scientific | 2026 |
| Arden Property Management LLP | | 2006 |
| Ardena Property Limited | Real estate | 2026 |
| Ardenpm Ltd | Real estate | 2025 |