| Albion Freight Ltd | Wholesale & retail | 2026 |
| Albion Grocer Ltd | Wholesale & retail | 2015 |
| Albion Growth Opportunities FP GP LLP | | 2021 |
| Albion Growth Opportunities FP LP | | 2021 |
| Albion Growth Opportunities II FP LP | | 2023 |
| Albion Healthcare Ltd. | Health & social care | 2005 |
| Albion Industries L.P. | | 2012 |
| Albion Management Services Ltd | Professional & scientific | 2020 |
| Albion Online Services L.P. | | 2014 |
| Albion Real Assets Carry GP LLP | | 2018 |
| Albion Real Assets Carry LP | | 2018 |
| Albion Real Assets Investments LP | | 2019 |
| Albion Vibes Media Ltd | Information & communication | 2026 |
| Albit Blockchain Ltd | Mining & quarrying | 2022 |
| Alborg Trading EU LP | | 2014 |
| Alby's Events Ltd | Hospitality | 2023 |
| Albyn Engineering Hub Ltd. | Other services | 2019 |
| Albyn Property Group Ltd | Real estate | 2025 |
| Albyn Solutions Limited | Construction | 2004 |
| Alcan Corporation L.P. | | 2012 |
| Alcatraz Locksmiths Ltd | Manufacturing | 2016 |
| Alchemia Gallery Limited | Wholesale & retail | 2011 |
| Alchemilla I LP | | 2011 |
| Alchemy Contracts (Scotland) Limited | Professional & scientific | 2018 |
| Alchemy Holdings LP | | 2016 |
| Alchemy Outsourcing LP | | 2022 |
| Alchemy: Goldsmiths Edinburgh CIC | Administrative & support | 2026 |
| Alciana SP | | 2000 |
| Alcira LP | | 2002 |
| Alco Plus L.P. | | 2016 |
| Alcohol IP Ltd | Information & communication | 2010 |
| Alcor Europe L.P. | | 2008 |
| Alcor Resources L.P. | | 2009 |
| Alcor Srevice LP | | 2016 |
| Alcor Universal L.P. | | 2011 |
| Alcuin General Partner Limited | Financial services | 2007 |
| Alda Telecom LP | | 2013 |
| Alda Traveled Ltd | Administrative & support | 2024 |
| Aldea Bella (NO. 50) Limited | Professional & scientific | 1988 |
| Aldec Trade LP | | 2013 |
| Alden Business Consulting Ltd | Professional & scientific | 2016 |
| Alder Box Limited | Wholesale & retail | 2024 |
| Alder Energy Limited | Energy | 2023 |
| Alder Joinery Limited | Administrative & support | 1998 |
| Alderbawer LP | | 2012 |
| Alderburn Finance Limited | Financial services | 2015 |
| Alderidge LP | | 2011 |
| Alderloch Limited | Transport & logistics | 2002 |
| Aldermayer LP | | 2014 |
| Alderson Conway Limited Partnership | | 2011 |
| Alderstone Accountancy Limited | Professional & scientific | 2019 |
| Alderstone AI Limited | Information & communication | 2025 |
| Alderstone Limited | Professional & scientific | 2022 |
| Alderton System LP | | 2013 |
| Alderview Limited | Extraterritorial | 2002 |
| Alderwick Services Ltd | Households | 2026 |
| Aldevon Ltd | Information & communication | 2026 |
| Aldford Trading LP | | 2013 |
| Aldgate Trading LP | | 2013 |
| Aldie Developments Limited | Agriculture & fishing | 1985 |
| Aldix Group LP | | 2016 |
| Aldomac Limited | Real estate | 2012 |
| Aldona Holdings LP | | 2015 |
| Aldridge-Blackledge Limited | Wholesale & retail | 2018 |
| Aldus Holdings (UK) Limited | Financial services | 2021 |
| Aldwych Capital Partners, L.P. | | 2014 |
| ALE (Edinburgh) Ltd | Financial services | 2024 |
| ALE Engineering Repairs Ltd | Manufacturing | 2024 |
| Aleantra Trading LP | | 2015 |
| Alechemy Brewing Ltd | Manufacturing | 2011 |
| Aleen & Larin Ltd | Other services | 2023 |
| Aleks Gilmerton Ltd | Other services | 2024 |
| Aleksandra Starosta User Research Ltd | Information & communication | 2022 |
| Alekstex Alliance LP | | 2017 |
| Alelor Consult LP | | 2016 |
| Alemat LP | | 2003 |
| Alemaxx Corporation LP | | 2015 |
| Alenic Limited | Wholesale & retail | 2020 |
| Alep Logistics Ltd | Real estate | 2015 |
| Alep Properties Ltd | Real estate | 2017 |
| Alero LP | | 2001 |
| Alert NOT Alarmed Enterprises Limited | Professional & scientific | 2018 |
| Alert Support Services L.P. | | 2009 |
| Alessandra Serreri Ltd | Administrative & support | 2024 |
| Alessio Vinci Ltd | Health & social care | 2023 |
| Alestar Trade LP | | 2015 |
| Aletta LP | | 2016 |
| Alex Adiele Ltd | Professional & scientific | 2021 |
| Alex App Ltd | Other services | 2018 |
| Alex Developers Group LP | | 2016 |
| Alex Hammond-Chambers & Company | Financial services | 1990 |
| Alex Healthcare Services Ltd | Health & social care | 2023 |
| Alex Holdings L.P. | | 2009 |
| Alex Holme Limited | Health & social care | 2013 |
| Alex Howell Consulting Ltd | Arts & recreation | 2019 |
| Alex Johnson Travel Ltd | Wholesale & retail | 2023 |
| Alex Kirkwood & SON Limited | Manufacturing | 2016 |
| Alex KYK Limited | Hospitality | 2022 |
| Alex LEE Ltd | Information & communication | 2022 |
| Alex Longson Ltd | Professional & scientific | 2022 |