| Anna Woolhouse Limited | Information & communication | 2012 |
| Anne Corder Recruitment Limited | Administrative & support | 2011 |
| Annette Paterakis Properties Limited | Real estate | 2024 |
| Annie Mukoshya Ltd | Health & social care | 2016 |
| Anns Investments Limited | Real estate | 2021 |
| Annsaa Ltd | Administrative & support | 2014 |
| Annuity Line Limited | Extraterritorial | 2012 |
| Annuity UK Limited | Financial services | 2018 |
| Annz Equity Limited | Professional & scientific | 2015 |
| Annz Estates Limited | Real estate | 2019 |
| Anra Smart Care Ltd | Transport & logistics | 2025 |
| Anseres Place Management Company (Stamford) Limited | Households | 2012 |
| Anskaitis Trans Ltd | Transport & logistics | 2016 |
| Antalya K & P Ltd | Hospitality | 2025 |
| Antares GAS Ltd | Professional & scientific | 2018 |
| Antares Installations Limited | Construction | 2014 |
| Ante Yachts Limited | Professional & scientific | 2021 |
| Anteon Food Group Ltd | Hospitality | 2026 |
| Anti-Crime Advisory and Educational Limited | Administrative & support | 2020 |
| Antics Events Ltd | Other services | 2019 |
| Antler Languages Limited | Education | 2011 |
| Antley Lettings Ltd | Real estate | 2023 |
| Antley Properties Ltd | Real estate | 2020 |
| Anto Logtrans Ltd | Transport & logistics | 2026 |
| Antonia Tasman Ltd | Information & communication | 2016 |
| Antoninos Pizzeria Ltd | Hospitality | 2010 |
| Antrassansas Ltd | Transport & logistics | 2021 |
| ANU Investments Ltd | Real estate | 2018 |
| Anvus Consultancy Ltd | Health & social care | 2015 |
| Anwar Group Ltd | Real estate | 2024 |
| Anwar Properties Ltd | Real estate | 2018 |
| ANY Waste Management Ltd | Water & waste | 2018 |
| Anycast Media Limited | Professional & scientific | 2016 |
| Anyplace Media Group Ltd | Manufacturing | 2018 |
| Anytruck Services Ltd | Wholesale & retail | 2024 |
| Anza Estate Services Ltd | Construction | 2023 |
| Anzenor Limited | Information & communication | 2025 |
| AO Rogalc Ltd | Wholesale & retail | 2025 |
| Aobo International Group Ltd | Professional & scientific | 2025 |
| AOK Packaging Consultants Limited | Administrative & support | 2013 |
| Aopc Limited | Professional & scientific | 2013 |
| AP Carpentry Management Limited | Construction | 2014 |
| AP Commercial Engineering Limited | Professional & scientific | 2026 |
| AP Diagnostic Services Ltd | Health & social care | 2014 |
| AP Social Care Consultancy Limited | Professional & scientific | 2018 |
| AP Starling Constructio Ltd | Construction | 2020 |
| AP Velo Limited | Wholesale & retail | 2025 |
| Apana Business Psychology Limited | Professional & scientific | 2011 |
| Apbe Ltd | Wholesale & retail | 2025 |
| APC Commercial Interiors Ltd | Construction | 2020 |
| APC Performance Limited | Wholesale & retail | 2025 |
| Apdtech Ltd | Information & communication | 2016 |
| Apettito Ltd | Wholesale & retail | 2025 |
| Apex Displays Ltd | Wholesale & retail | 2025 |
| Apex Electrical Group Limited | Construction | 2022 |
| Apex Fibre Solutions Ltd | Information & communication | 2021 |
| Apex Group Management Services Limited | Extraterritorial | 2024 |
| Apex Motors Ltd | Construction | 2014 |
| Apex Platinum Investments Limited | Construction | 2017 |
| Apex Properties 1 Ltd | Real estate | 2025 |
| Apex Training Centres (UK) Limited | Education | 2013 |
| Apex Tubes & Valves Limited | Administrative & support | 2016 |
| Apex Tubes & Valves Peterborough Ltd | Administrative & support | 2025 |
| Apexhaven Ltd | Real estate | 2025 |
| Apexx 007 Limited | Administrative & support | 2025 |
| Apexx Auto Group Ltd | Wholesale & retail | 2026 |
| APH Engineering Services Limited | Professional & scientific | 1989 |
| Apiary Solutions Consultancy Limited | Administrative & support | 2025 |
| Apilif Ltd | Wholesale & retail | 2020 |
| APK Properties Limited | Households | 2019 |
| Apkg Investment Ltd | Real estate | 2026 |
| Apms Compliance Limited | Construction | 2022 |
| Apnalibaas Limited | Wholesale & retail | 2023 |
| Apnate Ltd | Health & social care | 2020 |
| Apoc Europe B.V. Ltd | Wholesale & retail | 2026 |
| Apollo Gaming Ltd | Wholesale & retail | 2022 |
| Apollo Hair & Beauty Studio Ltd | Other services | 2025 |
| Apollo Integrated Systems Limited | Administrative & support | 2023 |
| Apollo Medicines Limited | Wholesale & retail | 2019 |
| Apollo Property Limited | Real estate | 2016 |
| Apollodorus Architecture Limited | Professional & scientific | 2016 |
| App Lifting Services Limited | Manufacturing | 1993 |
| App Trans Limited | Transport & logistics | 2025 |
| Applaud Media Limited | Professional & scientific | 2015 |
| Apple Blossom Pink Home & Lifestyle Ltd | Wholesale & retail | 2023 |
| Appledeal Ltd | Construction | 2021 |
| Applied Product Solutions Limited | Wholesale & retail | 1997 |
| Approachable Coaching Ltd | Education | 2007 |
| Appytax Limited | Information & communication | 2019 |
| APR+ Limited | Construction | 2026 |
| April Robotics Limited | Manufacturing | 2019 |
| Aprillux Limited | Wholesale & retail | 2026 |
| APS Computer Solutions Limited | Education | 1999 |
| Apshah Properties Limited | Real estate | 2022 |
| Apsl Holdings Limited | Professional & scientific | 2021 |
| Apsl Investments Limited | Professional & scientific | 2021 |
| Apsley Care Ltd | Health & social care | 2019 |
| Apsley Kitchen Limited | Information & communication | 2019 |
| Apteryx Surgical Ltd | Wholesale & retail | 2024 |
| APW Associates Limited | Administrative & support | 2013 |