| ANA Designs Ltd | Professional & scientific | 2022 |
| Anaben Services Ltd | Other services | 2020 |
| Anaele Healthcare Limited | Health & social care | 2023 |
| Analogue Music Ltd | Wholesale & retail | 2017 |
| Analyser Accounting Limited | Information & communication | 2017 |
| Analystree Learning Solutions Limited | Education | 2025 |
| Anastasia Alexandru Limited | Transport & logistics | 2018 |
| Anastasiasidiana Limited | Transport & logistics | 2025 |
| ANC Limited | Health & social care | 2024 |
| Anchor Meridian Services Ltd | Administrative & support | 2023 |
| Anchor Reach Management Company Limited | Households | 1996 |
| AND Limited Apopii Ltd | Transport & logistics | 2019 |
| AND Linen Limited | Wholesale & retail | 2014 |
| And.Stephan Ltd | Transport & logistics | 2025 |
| Anderson Education Consultants Ltd | Education | 2014 |
| Andersons Properties Group Ltd | Construction | 2025 |
| Andrada Ltd | Transport & logistics | 2020 |
| Andrew James Cars Ltd | Wholesale & retail | 2017 |
| Andrew Panayi Ltd | Extraterritorial | 2024 |
| Andrew ROW Furniture Ltd | Manufacturing | 2016 |
| Andro Engineering Ltd | Professional & scientific | 2007 |
| Andryytrans Ltd | Transport & logistics | 2023 |
| Andy's Trans Ltd | Transport & logistics | 2016 |
| Anerose Consultancy Ltd | Transport & logistics | 2026 |
| Anewthing Accounting Services Limited | Professional & scientific | 2011 |
| Anewthing Consulting Limited | Information & communication | 2019 |
| Angel Spaces Ltd | Real estate | 2022 |
| Angela's Cavern Ltd | Wholesale & retail | 2023 |
| Anikeems Limited | Transport & logistics | 2024 |
| Anita Kaur Ltd | Wholesale & retail | 2021 |
| Aniveh Ltd | Administrative & support | 2026 |
| Ankaisu Limited | Professional & scientific | 2018 |
| ANN Stephens Design Limited | Other services | 2001 |
| Anna Cleaning Services Limited | Administrative & support | 2026 |
| Anna Decors Ltd | Construction | 2026 |
| Annor Property Investments Ltd | Real estate | 2021 |
| Annotate Create LLP | | 2025 |
| Anor Services Ltd | Transport & logistics | 2018 |
| ANS Eastern Ltd | Construction | 2016 |
| Ansco Group Limited | Construction | 2021 |
| Ansha Developments Ltd | Real estate | 2026 |
| Ansrit Complex Care Ltd | Health & social care | 2016 |
| Ansted Limited | Education | 2023 |
| Ansun Foods Limited | Manufacturing | 2024 |
| Antar Limited | Health & social care | 2023 |
| Anthony James Beverages Limited | Wholesale & retail | 2019 |
| Anthony Traders UK Limited | Wholesale & retail | 2016 |
| ANTIWAVY1998 Ltd | Wholesale & retail | 2025 |
| Antler Property Services Limited | Real estate | 2025 |
| ANW Security Ltd | Administrative & support | 2023 |
| ANY Season Driving Ltd | Education | 2018 |
| ANØ 3DESIGN Limited | Professional & scientific | 2018 |
| AO Double Limited | Real estate | 2023 |
| AO Financial Ltd | Professional & scientific | 2022 |
| AOA Accounting Services Ltd | Professional & scientific | 2021 |
| Aomega Property Services Ltd | Hospitality | 2023 |
| Aorionx Builders Ltd | Construction | 2026 |
| Aots Consulting Limited | Information & communication | 2018 |
| AP Glassworks Ltd | Construction | 2022 |
| AP Power Services Limited | Energy | 2023 |
| AP Star Installations Ltd | Construction | 2021 |
| Aparey and Co Ltd | Professional & scientific | 2016 |
| Apaula Ltd | Transport & logistics | 2020 |
| APC Cleaning (Kent) Ltd | Administrative & support | 2025 |
| Apex Builders (S.E.) Limited | Construction | 2006 |
| Apex Compliance Group Ltd | Professional & scientific | 2026 |
| Apex Highways Solutions Ltd | Construction | 2025 |
| Apex IT Consultants Ltd | Information & communication | 2017 |
| Apex One Business Services Limited | Financial services | 2012 |
| Apexframe Developments Ltd | Construction | 2025 |
| Apexglow Solution Limited | Administrative & support | 2026 |
| APG Trading Limited | Wholesale & retail | 2021 |
| Apna 51 Limited | Administrative & support | 2025 |
| Apna Properties 2 Ltd | Real estate | 2022 |
| Apna Properties Ltd | Real estate | 2022 |
| Apollo Taxis Gravesend Limited | Transport & logistics | 2018 |
| Apothecary Consulting Limited | Health & social care | 2021 |
| Apple Accommodation Ltd | Health & social care | 2025 |
| Apple Automotive Developments Limited | Wholesale & retail | 2019 |
| Appledore Packaging Limited | Administrative & support | 1995 |
| Applemore Kennels & Cattery Ltd | Other services | 2013 |
| Applied Contracting Solutions Ltd | Construction | 2023 |
| Appreciate.Presents Ltd | Information & communication | 2025 |
| APS Electrical (London) Ltd | Construction | 2014 |
| APS Electrical Services Limited | Construction | 2008 |
| Apsam Limited | Real estate | 2016 |
| Apti Limited | Wholesale & retail | 2022 |
| APX Car Travel Ltd | Transport & logistics | 2025 |
| Aqua Core Plumbing Services Limited | Extraterritorial | 2020 |
| Aquilegia Media Ltd | Administrative & support | 2023 |
| AR Building Contractors and Double Glazing Ltd | Construction | 2021 |
| AR Invest Ltd | Real estate | 2023 |
| AR Investment Group Ltd | Real estate | 2026 |
| AR Properties Solutions Ltd | Real estate | 2026 |
| AR4 Electrical Ltd | Construction | 2026 |
| Arab Investment Development Authority Ltd | Other services | 2018 |
| Arality E-Vents Limited | Manufacturing | 2020 |
| Aramead Limited | Health & social care | 2018 |
| Arana Investments Ltd | Real estate | 2020 |
| Arash Trading Limited | Other services | 2008 |