| AMB Security Consultancy Ltd | Administrative & support | 2021 |
| Amber Acre Estates Limited | Real estate | 2026 |
| Amber Film Productions Limited | Information & communication | 2017 |
| Amberley Equestrian Ltd | Agriculture & fishing | 2021 |
| Ambilliam Loft Access Limited | Construction | 2024 |
| Ambrad Consulting Ltd | Professional & scientific | 2024 |
| Ambrad Group Ltd | Real estate | 2022 |
| Ambrey (Markab) Limited | Administrative & support | 2017 |
| Ambrey (Menkar) Limited | Administrative & support | 2017 |
| Ambrey 25N Limited | Administrative & support | 2017 |
| Ambrey Analytics Limited | Professional & scientific | 2023 |
| Ambrey Athena Limited | Administrative & support | 2020 |
| Ambrey Global Response (NO.2) Limited | Administrative & support | 2025 |
| Ambrey Global Response (NO.3) Limited | Administrative & support | 2025 |
| Ambrey Global Response Ltd | Administrative & support | 2024 |
| Ambrey Global Specialty Limited | Financial services | 2024 |
| Ambrey Holdings Limited | Administrative & support | 2020 |
| Ambrey Insurance Brokers Limited | Administrative & support | 2020 |
| Ambrey International Limited | Professional & scientific | 2016 |
| Ambrey Limited | Administrative & support | 2016 |
| Ambrey Markab Management Limited | Administrative & support | 2017 |
| Ambrey Mirfak Limited | Administrative & support | 2020 |
| Ambrey Nigeria Limited | Administrative & support | 2017 |
| Ambrey Offshore Limited | Administrative & support | 2013 |
| Ambrey Orcades Limited | Administrative & support | 2020 |
| Ambrey Orsuro Limited | Administrative & support | 2018 |
| Ambrey Pegasus Limited | Administrative & support | 2018 |
| Ambrey Response Services Ltd | Administrative & support | 2024 |
| Ambrey Risk Limited | Professional & scientific | 2010 |
| Ambrey Sentinel Ltd | Administrative & support | 2018 |
| Ambrey Shipyards Limited | Manufacturing | 2020 |
| Ambrey Sirius Limited | Administrative & support | 2018 |
| Ambrey Sirius One Limited | Administrative & support | 2021 |
| Ambrey Sirius Two Limited | Administrative & support | 2021 |
| Ambrey Travel Limited | Administrative & support | 2020 |
| Ambrey Venturer Limited | Administrative & support | 2017 |
| AMD Training Limited | Construction | 2018 |
| Amma’S HUG CIC | Arts & recreation | 2025 |
| AMP Building and Property Services Ltd | Construction | 2018 |
| AMY Pitt Consultancy Ltd | Professional & scientific | 2024 |
| AN Haider Ltd | Information & communication | 2020 |
| Anaesthesia Assist Limited | Health & social care | 2024 |
| Anajacy Co Limited | Health & social care | 2026 |
| Anamcara Developments Limited | Real estate | 2021 |
| Anarid Ltd | Health & social care | 2025 |
| Anash Aarushi Ltd | Wholesale & retail | 2018 |
| Anchors Aweigh (Lugwardine) Limited | Hospitality | 2025 |
| Ancient LAB Limited | Professional & scientific | 2023 |
| Anderson Electrical Ltd | Manufacturing | 2019 |
| Andrew Ashcroft Planning Limited | Administrative & support | 2015 |
| Andrew Baker Associates Limited | Real estate | 2013 |
| Andrew Cameron & Keith Preece Golf Services Limited | Wholesale & retail | 2008 |
| Andrew Howe GAS Service and Repair Ltd | Extraterritorial | 2011 |
| Andrew Morris Estate Agents Ltd | Real estate | 2011 |
| Andrew Targett Business Consultancy Ltd | Professional & scientific | 2020 |
| Andrews Construction Consultancy Limited | Professional & scientific | 2013 |
| Andrews Hair Studio Ltd | Other services | 2003 |
| Anhaider Property Ltd | Real estate | 2021 |
| Animal Analytics Limited | Information & communication | 2021 |
| Animal Herbal Health Limited | Agriculture & fishing | 2019 |
| Animal Rights Journal Ltd | Information & communication | 2019 |
| Animus Astra Limited | Information & communication | 2024 |
| Anlo Associates Limited | Extraterritorial | 1980 |
| Anlo Associates UK LLP | | 2009 |
| Ann&David Ltd | Wholesale & retail | 2017 |
| Annex Creative Ltd | Professional & scientific | 2017 |
| Anni Molloy ISW Ltd | Health & social care | 2020 |
| Annie Thomas Ltd | Real estate | 2022 |
| ANP Pole Events Limited | Education | 2024 |
| Anstey Goldsack Ltd | Agriculture & fishing | 2025 |
| ANT Consultancy Limited | Professional & scientific | 2022 |
| Anthony Priddle Architects LLP | | 2010 |
| Antony Edwards Associates Ltd | Professional & scientific | 2012 |
| Antrol+ Services Ltd | Construction | 2020 |
| Antson Limited | Wholesale & retail | 2011 |
| Anubis.Uk Limited | Other services | 2001 |
| Anve Honey Ltd | Agriculture & fishing | 2023 |
| Anvi Investments Ltd | Real estate | 2019 |
| Anybody Clinic Ltd | Other services | 2026 |
| AP Building Group Ltd | Real estate | 2021 |
| AP Construction Group Ltd | Construction | 2021 |
| AP Forestry Ltd | Agriculture & fishing | 2023 |
| AP Stage Solutions Ltd | Administrative & support | 2021 |
| AP20 Limited | Administrative & support | 2018 |
| APL Accountants (South) Limited | Professional & scientific | 2021 |
| Apmbuild Ltd | Construction | 2024 |
| Apocalypse the Movie Ltd | Information & communication | 2014 |
| Apog Ltd | Real estate | 2020 |
| Apple Orcharding Solutions Limited | Agriculture & fishing | 2010 |
| Apple Tree Close Limited | Households | 2019 |
| Apple Trees Properties Ltd | Households | 2021 |
| Appleton Asset Management Limited | Real estate | 2017 |
| Appleton Family Farm Ltd | Agriculture & fishing | 2020 |
| Applicaa Ltd | Information & communication | 2013 |
| APS Roofing Specialists Ltd | Construction | 2025 |
| Aqua Navis Ltd | Financial services | 2018 |
| Aqua-Heat Limited | Wholesale & retail | 1994 |
| Aquassist Ltd | Water & waste | 2005 |
| Arad Metering Services (UK) Limited | Water & waste | 2007 |
| Araemo Financial Ltd | Financial services | 2019 |