| Argyll Media Limited | Information & communication | 2015 |
| Argyll Property Ltd | Real estate | 2025 |
| Argyll Trading LP | | 2013 |
| Argyroudi Limited | Health & social care | 2013 |
| Arham & Noor Enterprises Limited | Wholesale & retail | 2012 |
| Arheus Dental Ltd | Health & social care | 2025 |
| Arhitech Project LP | | 2016 |
| ARI Edin Ltd | Real estate | 2026 |
| Aria Alba - Opera for ALL | Arts & recreation | 2011 |
| Aria Blaze LP | | 2016 |
| Aria Residential Limited | Real estate | 2019 |
| Aria Scotland Ltd | Administrative & support | 2025 |
| Ariabram LP | | 2015 |
| Ariadne Capital Partners Carry Scottish L.P. | | 2010 |
| Ariagro Group LP | | 2017 |
| Arial Technologies LP | | 2013 |
| Ariana’S Kebab Limited | Hospitality | 2020 |
| Ariane Investors L.P. | | 2009 |
| Arianna Management LP | | 2013 |
| Ariban LP | | 2014 |
| Arid Global Traders Ltd | Wholesale & retail | 2026 |
| Aridna LP | | 2014 |
| Ariel Impex LP | | 2011 |
| Ariel Investment Management LLP | | 2018 |
| Ariel Property Holdings L.P. | | 2018 |
| Arif Alberto Ltd | Transport & logistics | 2025 |
| Arifa Trading Ltd | Wholesale & retail | 2025 |
| Arigato Retail Services LP | | 2023 |
| Arighi Bianchi General Partner Limited | Financial services | 2018 |
| Arighi Bianchi Scottish Limited Partnership | | 2018 |
| Arika Heavy Industries CIC | Arts & recreation | 2006 |
| Arika Investment LP | | 2015 |
| Ariman Ltd | Financial services | 2021 |
| Arin Alliance LP | | 2014 |
| Arine Trade LP | | 2019 |
| Ariosti Ltd | Hospitality | 2025 |
| Arisa Investments SP LP | | 2000 |
| Arisaig Farms Limited | Administrative & support | 2014 |
| Arisaig Solutions Limited | Professional & scientific | 2023 |
| Arisara LP | | 2015 |
| ARISH19 Ltd | Transport & logistics | 2021 |
| Arisse Limited | Wholesale & retail | 2026 |
| Arister Solutions LP | | 2013 |
| Aristo Business L.P. | | 2017 |
| Aristo Supreme LP | | 2017 |
| Aristokrat Business LP | | 2016 |
| Ariston Foods Ltd | Hospitality | 2014 |
| Ariston Foodservice Ltd | Hospitality | 2024 |
| Aristox Business LP | | 2013 |
| Arit Alliance LP | | 2014 |
| Arithmia Limited | Information & communication | 2024 |
| Arizo LUX LP | | 2016 |
| Arjowiggins Papers Limited | Financial services | 2019 |
| Arjt Properties Holdings Ltd | Real estate | 2026 |
| Arjun Alliance Europe 1 LP | | 2021 |
| Arjun Alliance Europe 2 LP | | 2022 |
| Arjun Alliance UK 2 LP | | 2020 |
| Arjun GP | Financial services | 2018 |
| Arjun Infrastructure Renewables LLP | | 2017 |
| Arjun Renewables LP | | 2018 |
| Arjunaputra Holding LP | | 2018 |
| ARK ALL Trades Ltd | Construction | 2024 |
| ARK Commercial Investment Limited | Hospitality | 2015 |
| ARK DEV Ltd | Construction | 2025 |
| ARK Enterprises Limited | Wholesale & retail | 1989 |
| ARK Group Scientific Solutions Private Ltd | Information & communication | 2025 |
| ARK Group Scotland Limited | Financial services | 2025 |
| ARK Intertrade L.P. | | 2012 |
| ARK Property Solutions Limited | Real estate | 2023 |
| ARK Services Limited | Hospitality | 2000 |
| ARK Trade LLP | | 2015 |
| Arkaig Hydrogen Plant Limited | Energy | 2023 |
| Arkaig Ltd | Financial services | 2021 |
| Arkan Alkemah Ltd | Other services | 2024 |
| Arkcrest Limited | Information & communication | 2007 |
| Arkendale Corporation L.P. | | 2012 |
| Arkive Curation Ltd | Wholesale & retail | 2025 |
| Arkley Square LP | | 2015 |
| Arknod Ltd | Other services | 2024 |
| Arko Tech Limited | Information & communication | 2026 |
| Arkuis Ltd | Professional & scientific | 2026 |
| ARL Carry Scottish Limited Partnership | | 2005 |
| ARL Direct Transport & Distribution Services Limited | Transport & logistics | 2019 |
| Arlan Media Ltd | Professional & scientific | 2025 |
| Arlecchino LP | | 2014 |
| Arley Investments L.P. | | 2011 |
| Arlh Analytics Ltd | Professional & scientific | 2022 |
| Arlik Trade LP | | 2013 |
| Arlington Partnership LP | | 2014 |
| Arlington Private Office LP | | 2013 |
| Arlinteks Sales LP | | 2013 |
| Arlo Edinburgh Limited | Information & communication | 2022 |
| Arltsols Ltd | Information & communication | 2016 |
| Arlum LP | | 2000 |
| Arluma Ltd | Information & communication | 2025 |
| ARM Investment Management Ltd | Extraterritorial | 2012 |
| ARM Property Management Ltd | Real estate | 2010 |
| Armada & Navarra LP | | 2011 |
| Armada Tour LP | | 2016 |
| Armadex Universal LP | | 2014 |