| Anthoula Madden Ltd | Professional & scientific | 2017 |
| Antik Yachting Limited | Extraterritorial | 2023 |
| Anton's Café Bar Ltd | Hospitality | 2022 |
| Anusa&Wash Ltd | Construction | 2022 |
| ANV Software Limited | Information & communication | 2017 |
| AP Harvie Housing Ltd | Real estate | 2026 |
| AP Harvie Ltd | Transport & logistics | 2024 |
| AP Lifting Ltd | Construction | 2024 |
| Apache Industries Limited | Other services | 2018 |
| Apapachar Limited | Real estate | 2024 |
| APB Site Services Ltd | Construction | 2018 |
| Apex Baristas Ltd | Hospitality | 2024 |
| Apex Brickworks NW Ltd | Construction | 2025 |
| Apex Cafe Ltd | Hospitality | 2025 |
| Apex Cycleworks Ltd | Manufacturing | 2021 |
| Apex Fire NW Ltd | Construction | 2026 |
| Apex Line Group Ltd | Wholesale & retail | 2026 |
| Apex of the Curve Limited | Information & communication | 2009 |
| Apex Private Events Ltd | Hospitality | 2024 |
| Apexmotoevents Limited | Administrative & support | 2026 |
| Aphrodite Consultancy Limited | Administrative & support | 2013 |
| APL Maintenance Ltd | Construction | 2022 |
| APM Services (NW) Limited | Financial services | 2009 |
| APM Tech Ltd | Information & communication | 2017 |
| Apolgeeh Ltd | Health & social care | 2023 |
| Apollo Concert Venue Ltd | Arts & recreation | 2011 |
| App Crafted Limited | Information & communication | 2026 |
| Apple Chalets Ltd | Hospitality | 2014 |
| Applerigg IT Limited | Information & communication | 2014 |
| Appleshift Ltd | Professional & scientific | 2015 |
| Appleton Digital Services Ltd | Information & communication | 2021 |
| Appletree Kennels Ltd | Other services | 2023 |
| Appliance Spares Direct Limited | Manufacturing | 2003 |
| Appnex Tech Limited | Information & communication | 2026 |
| Appteka Limited | Information & communication | 2007 |
| Appura Cloud Limited | Information & communication | 2017 |
| Apricot Africa Consulting Limited | Professional & scientific | 2021 |
| APS Investments NW Ltd | Real estate | 2026 |
| Aptroid Ltd | Information & communication | 2018 |
| Aquafame Ltd | Hospitality | 2013 |
| Aquarius Bathrooms Limited | Wholesale & retail | 2012 |
| Aquasure Spa Care Limited | Wholesale & retail | 2024 |
| Aqueous Thermo Energy Solutions Limited | Wholesale & retail | 2017 |
| AR HQ Car Care Ltd | Wholesale & retail | 2025 |
| Aragon Interprise Ltd | Wholesale & retail | 2025 |
| Araluc Ltd | Information & communication | 2014 |
| Arbutus Holdings Limited | Real estate | 2019 |
| Arcade Club 3 Limited | Arts & recreation | 2019 |
| Arcade Parts Limited | Manufacturing | 2023 |
| Arcadia Publishing Limited | Professional & scientific | 2018 |
| Arcadia Three Limited | Construction | 2011 |
| Arcana Cards Ltd | Wholesale & retail | 2025 |
| Arch Property Developments Ltd | Construction | 2015 |
| Archer Project Management Solutions Limited | Information & communication | 2008 |
| Arcus Ecommerce Ltd | Information & communication | 2017 |
| Arcworks Interactive Ltd | Information & communication | 2026 |
| ARD Holdings Limited | Professional & scientific | 2017 |
| Ardamore Ltd | Wholesale & retail | 2025 |
| Arden Muir Limited | Information & communication | 2025 |
| Ardman Engineering Services Limited | Construction | 2014 |
| Ardmore Reconstituted Sandstone Ltd | Wholesale & retail | 2025 |
| Area 71 Limited | Arts & recreation | 2018 |
| Aren Yachting Ltd | Extraterritorial | 2024 |
| Argyle Nominee Limited | Administrative & support | 2024 |
| Argyll Court Limited | Households | 2026 |
| ARH Custom Limited | Wholesale & retail | 2008 |
| Ariana House Hotel Ltd | Hospitality | 2021 |
| Aries 22 Limited | Professional & scientific | 2016 |
| Arisha Worldwide Limited | Hospitality | 2016 |
| Arizac Rope Access Ltd | Mining & quarrying | 2018 |
| ARK Accounting and Secretarial Services Ltd | Information & communication | 2020 |
| Arkham Leisure Limited | Hospitality | 2018 |
| Arma Yachting Ltd | Extraterritorial | 2025 |
| Armah Consultants Limited | Professional & scientific | 2019 |
| Armatank Limited | Manufacturing | 2002 |
| Armetriding Reaches Management Co Limited | Households | 2018 |
| ARN Engineering Services Ltd | Information & communication | 2019 |
| Arnfield Developments Limited | Construction | 2024 |
| Arnfields Complete Construction Ltd | Construction | 2026 |
| Arnies Blackpool Limited | Hospitality | 2025 |
| Arnold Livesey Electrical Limited | Construction | 2002 |
| Around Saddleworth Magazine Ltd | Information & communication | 2010 |
| Arran House Hotel Limited | Hospitality | 2022 |
| Arranazz Sound Equipment Hire Ltd | Arts & recreation | 2025 |
| Arrowsmith Construction Limited | Professional & scientific | 2004 |
| ARS Vivendi Investments Ltd | Real estate | 2021 |
| ARS Vivendi Trading Ltd | Hospitality | 2021 |
| Arshad E-Commerce Ltd | Wholesale & retail | 2025 |
| Art B&B CIC | Professional & scientific | 2016 |
| Art Break Gallery Limited | Arts & recreation | 2018 |
| Art Signs Lancashire Ltd | Professional & scientific | 2023 |
| Art&Etta Ltd | Wholesale & retail | 2021 |
| Artisan Tiles & Bathrooms Limited | Wholesale & retail | 2024 |
| Artists R US Ltd | Manufacturing | 2025 |
| Artlay Developments Limited | Construction | 2025 |
| Artmarine Ltd | Extraterritorial | 2026 |
| Arvelo Ltd | Information & communication | 2025 |
| Aryan Hotel Rooms Ltd | Administrative & support | 2019 |
| Aryeh Projects Limited | Professional & scientific | 2016 |
| AS Dental Surgeries Ltd | Health & social care | 2023 |