| Apex Transport Solutions Ltd | Transport & logistics | 2017 |
| APN Property Limited | Professional & scientific | 2022 |
| Apna Photographic Studios Limited | Professional & scientific | 2006 |
| Apocalypse Limited | Arts & recreation | 2017 |
| Apoello Limited | Professional & scientific | 2025 |
| Apollo Design Fire Protection Services Ltd | Professional & scientific | 2019 |
| Apollo Sealants Contracting Limited | Extraterritorial | 2012 |
| Apollo Sealants Limited | Construction | 2010 |
| Appleby Horse Fair Ltd | Wholesale & retail | 2026 |
| Applecast Limited | Agriculture & fishing | 2006 |
| Appleton Group Limited | Administrative & support | 2019 |
| Appley Bridge Diagnostics Ltd | Wholesale & retail | 2020 |
| Appley Bridge Gymnastics Club Ltd | Arts & recreation | 2026 |
| Appley Wood Bookkeeping Limited | Professional & scientific | 2017 |
| Aprose Solutions Limited | Information & communication | 2014 |
| Apus Peak Ltd | Wholesale & retail | 2020 |
| Aquablue Property Services Ltd | Wholesale & retail | 2025 |
| Aquaflow Drainage Services Limited | Professional & scientific | 2003 |
| Aquaflow DS (Holdings) Limited | Professional & scientific | 2018 |
| Aquajet Machining Systems Limited | Manufacturing | 1995 |
| Aquardia Process Solutions Ltd. | Construction | 2015 |
| Aquatic Solutions Ltd | Wholesale & retail | 2019 |
| Aquinta Consulting Ltd | Other services | 2014 |
| Araa Consulting Limited | Professional & scientific | 2018 |
| Arbitrium Property Ltd | Real estate | 2019 |
| ARC Trailers Ltd. | Manufacturing | 2024 |
| ARC-10 Studio Limited | Professional & scientific | 2023 |
| Arcane Creative Ltd | Information & communication | 2024 |
| Arch Draughting Services Ltd | Professional & scientific | 2017 |
| Arco Investment Ltd | Construction | 2016 |
| Arcobaleno Consulting Limited | Construction | 2017 |
| Arctic Basin Ltd | Mining & quarrying | 2023 |
| ARD Care Ltd | Health & social care | 2024 |
| Arda & Duddle Properties Ltd | Real estate | 2026 |
| Ardamine Ltd | Wholesale & retail | 2020 |
| Ardielty Ltd | Real estate | 2024 |
| Ardleigh Construction Ltd | Construction | 2016 |
| Ardmore Stone and Landscaping Ltd | Construction | 2024 |
| Ardour Venetian Limited | Construction | 2018 |
| Areetcha Limited | Wholesale & retail | 2022 |
| Arena Property Group Limited | Real estate | 2025 |
| ARH Building Ltd | Construction | 2021 |
| Arise Educational Psychology Ltd | Education | 2023 |
| Arivan Motors Ltd | Wholesale & retail | 2023 |
| ARK Fleetech Ltd | Manufacturing | 2013 |
| Arkeron Productions Limited | Arts & recreation | 2019 |
| ARM Lettings Ltd | Real estate | 2025 |
| Arma Property Investments Ltd | Real estate | 2025 |
| Armerah Limited | Wholesale & retail | 2019 |
| Armitage BT Limited | Financial services | 2023 |
| Armitage GT Limited | Construction | 2023 |
| Armlee Group Limited | Financial services | 2021 |
| Armlee Nurseries Limited | Wholesale & retail | 2018 |
| Armstrong Harrison Limited | Real estate | 2019 |
| Armstrong James Limited | Professional & scientific | 2026 |
| ARN Construction (NW) Limited | Construction | 2021 |
| ARN Contracting Limited | Construction | 2018 |
| ARN Projects (NW) Limited | Construction | 2022 |
| ARN Properties and Development Limited | Construction | 2025 |
| Arnold & Phillips (Chorley) Limited | Real estate | 2015 |
| Arnold & Phillips (Ormskirk) Limited | Real estate | 2013 |
| Arnold & Phillips (Southport) Limited | Real estate | 2012 |
| Aroma Spicy Food Ltd | Hospitality | 2023 |
| Aromaspa Limited | Other services | 2018 |
| Around and About Limited | Information & communication | 2008 |
| Arrow Diamond Tooling Ltd | Wholesale & retail | 2020 |
| Art Science Magic Limited | Health & social care | 2020 |
| ART2VR Limited | Arts & recreation | 2016 |
| Artemis Breast Ltd | Health & social care | 2025 |
| Artemis Gray UK Limited | Professional & scientific | 2019 |
| Artemis Performance Ltd | Health & social care | 2025 |
| Artflow Ltd | Arts & recreation | 2024 |
| Arthropod Leisure Limited | Manufacturing | 2020 |
| Arthur Developments NW Limited | Construction | 2021 |
| Arthur Pooley Limited | Agriculture & fishing | 1998 |
| Artisan Agency Ltd | Professional & scientific | 2017 |
| Artisan Strategic Land Limited | Real estate | 2025 |
| Artisan Trading Solutions Limited | Construction | 2013 |
| Artume Properties Ltd | Real estate | 2024 |
| Arturbuilding Construction & Design Ltd | Construction | 2023 |
| Arundale Builders Limited | Construction | 2015 |
| ARW Wealth Management Limited | Financial services | 2012 |
| AS Pharma Consultancy Limited | Manufacturing | 2014 |
| Asap Mobile Servicing Limited | Wholesale & retail | 2016 |
| ASC Kitchens & Bathrooms Limited | Wholesale & retail | 2005 |
| ASC Sofas & Furniture Limited | Wholesale & retail | 2025 |
| Asel Trading Ltd | Hospitality | 2023 |
| ASH Geoservices UK Limited | Professional & scientific | 2011 |
| ASH House Consultancy Ltd | Education | 2017 |
| Ashby Motors Ltd | Wholesale & retail | 2021 |
| Ashcombe Place (Management Company) Limited | Households | 2006 |
| Ashgrove Building Services Limited | Construction | 2014 |
| Ashgrove Platinum Projects Limited | Public administration | 2016 |
| Ashkon Limited | Wholesale & retail | 2026 |
| Ashlea Farm Ltd | Construction | 2023 |
| Ashley Domestic Shutter Doors Ltd | Manufacturing | 2023 |
| Ashro Promotions Ltd | Administrative & support | 2009 |
| Ashton Bedrooms Ltd | Administrative & support | 2013 |
| Ashton Furnishings Ltd | Wholesale & retail | 2023 |
| Ashton Motor Sales Ltd | Wholesale & retail | 2025 |