| Artyclean Ltd | Administrative & support | 2025 |
| Aruka Ltd | Health & social care | 2023 |
| Arukah Restorations Limited | Real estate | 2025 |
| Arunas Transport Ltd | Transport & logistics | 2019 |
| ARV Transport Ltd | Transport & logistics | 2025 |
| Aryan Nirya Ltd | Wholesale & retail | 2018 |
| Aryan Property Solutions Ltd | Real estate | 2018 |
| Aryana Trans Limited | Transport & logistics | 2018 |
| AS Design & Builders Ltd | Construction | 2026 |
| AS Design Services Ltd | Professional & scientific | 2019 |
| AS Drylining Ltd | Construction | 2018 |
| AS Marketing Ltd | Financial services | 2025 |
| AS Plumbing and Heating Northampton Ltd | Construction | 2025 |
| AS Quick AS YOU Like Ltd | Transport & logistics | 2020 |
| As&Td UK Limited | Wholesale & retail | 2026 |
| AS15 Ltd | Wholesale & retail | 2025 |
| Asanteman Nkabomkuo Northampton Ltd | Education | 2026 |
| Asanteman Northampton Ltd | Education | 2025 |
| Asap Builders Limited | Construction | 2018 |
| Asap Records & 500K Management Limited | Information & communication | 2024 |
| Asaw Properties Limited | Real estate | 2026 |
| Asb-Mcm UK Construction Limited | Construction | 2016 |
| Asbestos Northampton Limited | Professional & scientific | 2014 |
| Asbk Limited | Administrative & support | 2011 |
| Asbuildingsolutions Ltd | Construction | 2025 |
| Ascend Padel MK Limited | Arts & recreation | 2025 |
| Ascendia Property Group Ltd | Real estate | 2024 |
| Ascension Lift Solutions Limited | Manufacturing | 2022 |
| Ascent Bar Group Ltd | Hospitality | 2022 |
| Ascent Care and Services Ltd | Administrative & support | 2022 |
| Ascentra Ltd | Information & communication | 2023 |
| Asch Ltd | Arts & recreation | 2018 |
| Ascott Builders Limited | Construction | 2007 |
| Ascrafters Ltd | Wholesale & retail | 2026 |
| ASD Care Limited | Health & social care | 2019 |
| Asdom Solutions Limited | Professional & scientific | 2013 |
| Asett Estate Agent Ltd | Extraterritorial | 2022 |
| Asett Ltd | Real estate | 2019 |
| ASG Trans Ltd | Transport & logistics | 2019 |
| ASH Caribbean Food Ltd | Hospitality | 2023 |
| ASH Dental Practice Limited | Health & social care | 2010 |
| ASH LUX Limited | Professional & scientific | 2024 |
| ASH Premier Cleaning Ltd | Administrative & support | 2025 |
| ASH Rentals Ltd | Real estate | 2021 |
| Ashana Properties Ltd | Real estate | 2022 |
| Ashbrooke Manufacturing Limited | Manufacturing | 2018 |
| Ashby Computer Services (Northampton) Ltd | Extraterritorial | 1988 |
| Ashby Computer Services LLP | | 2013 |
| Ashby Falcon Ltd | Hospitality | 2016 |
| Ashby House Group Limited | Financial services | 2016 |
| Ashby House Land and Development Limited | Construction | 2016 |
| Ashby Mortgages Ltd | Financial services | 2018 |
| Ashby Storage Ltd | Transport & logistics | 2025 |
| Ashby Technical Support Services Limited | Professional & scientific | 2011 |
| Ashdale Properties Ltd | Real estate | 2022 |
| Ashdown Homes Limited | Construction | 2013 |
| Asheem UK Limited | Professional & scientific | 2024 |
| Ashfield Aesthetics & Skin Limited | Other services | 2025 |
| Ashgo Limited | Wholesale & retail | 2026 |
| Ashlea Enterprise Ltd | Construction | 2022 |
| Ashley Payne Consulting Ltd | Professional & scientific | 2022 |
| Ashley Riley Communications Limited | Professional & scientific | 2012 |
| Ashlynn Transport Limited | Transport & logistics | 2006 |
| Ashmac Construction Limited | Construction | 2002 |
| Ashme Ltd | Professional & scientific | 2023 |
| Ashmi Holdings Limited | Real estate | 2018 |
| Ashmi Property Rentals Limited | Real estate | 2022 |
| Ashridge Prestige Ltd | Wholesale & retail | 2009 |
| Ashstead Ltd | Construction | 2026 |
| Ashstead Roofing Ltd | Construction | 2026 |
| Ashton Court Information Management Limited | Information & communication | 2002 |
| Ashton Court Properties Limited | Real estate | 2019 |
| Ashton Court Solutions Limited | Information & communication | 2020 |
| Ashton Morgan Lettings Limited | Real estate | 2013 |
| Ashton Plastering Contractors Ltd | Construction | 2019 |
| Ashvale Engineering and Project Management Ltd | Professional & scientific | 2024 |
| Ashvic 24/7 Quality Care Services Limited | Health & social care | 2017 |
| Ashvic Care & Support Services Ltd | Health & social care | 2026 |
| Ashvic Home Care Solutions Limited | Health & social care | 2026 |
| Ashvik Prime Construction Limited | Construction | 2024 |
| Ashway Electrical Ltd | Construction | 2024 |
| Ashwood Auto Parts Ltd | Other services | 2021 |
| Ashwood Developments Ltd | Construction | 2023 |
| Ashwood Plastering Northampton Limited | Construction | 2018 |
| Ashyuv Limited | Information & communication | 2014 |
| Asiakoo Ltd | Agriculture & fishing | 2023 |
| Asians Corporation Ltd | Wholesale & retail | 2025 |
| Asigma Ltd | Wholesale & retail | 2025 |
| Asim Transport Ltd | Transport & logistics | 2020 |
| Asistir Health and Safety Services Limited | Professional & scientific | 2025 |
| Asiya FX Consultancy Limited | Administrative & support | 2019 |
| ASK4DRIVER Ltd | Construction | 2022 |
| Askelie Limited | Information & communication | 2024 |
| Asker Salman Ltd | Hospitality | 2021 |
| Askh for Motors Ltd | Extraterritorial | 2015 |
| ASM Beauty Ltd | Other services | 2024 |
| Asmo Construct Ltd | Construction | 2022 |
| Ason Traders Limited | Wholesale & retail | 2022 |
| ASP Transport & Removals & Storage Ltd | Transport & logistics | 2018 |
| Aspect Exhibitions Ltd | Extraterritorial | 2020 |