| Angel Wings Travel Solution Ltd | Administrative & support | 2024 |
| Angela Hutchison Ltd | Professional & scientific | 2012 |
| Angelcity Health Ltd | Health & social care | 2024 |
| Angelcynn Contracting Limited | Professional & scientific | 2017 |
| Angelic Emma Spiritual Therapy Ltd | Health & social care | 2026 |
| Angels Kitchen at the Hub Ltd | Hospitality | 2023 |
| Anglo-Indo Plant Hire Limited | Administrative & support | 2017 |
| Anglo-Thai Legal Company Limited | Professional & scientific | 2010 |
| Angloasia Investment Capital Ltd | Real estate | 2013 |
| Angry Candy Ltd | Information & communication | 2013 |
| Angularity Limited | Information & communication | 2010 |
| Angus Technical Services Limited | Administrative & support | 2013 |
| Anhydritec Limited | Construction | 1995 |
| Anigou Limited | Administrative & support | 2014 |
| Anika Foodz Ltd Limited | Hospitality | 2024 |
| Anila Care Limited | Administrative & support | 2025 |
| Animalistic Movement Ltd | Administrative & support | 2023 |
| Anjh Ltd | Manufacturing | 2025 |
| Anlehcarna Limited | Administrative & support | 2022 |
| ANM Consulting Services Ltd | Other services | 2019 |
| Anmikare Ltd | Administrative & support | 2025 |
| Anmol Warrington Limited | Hospitality | 2021 |
| ANN Engineering Solutions Limited | Administrative & support | 2024 |
| Ann's Gentle Hands Ltd | Health & social care | 2025 |
| Anna Louise Consulting Ltd | Administrative & support | 2024 |
| Anna Passey Limited | Arts & recreation | 2015 |
| Anna Power Ltd | Transport & logistics | 2025 |
| Anne Dornan Limited | Professional & scientific | 2020 |
| Annguz Design Limited | Professional & scientific | 2018 |
| Annular Group Ltd | Professional & scientific | 2023 |
| Annvie Limited | Administrative & support | 2012 |
| ANP Romy Ltd | Health & social care | 2014 |
| Anrebad Limited | Real estate | 2020 |
| Ansah Events Ltd | Professional & scientific | 2023 |
| Ansell (Sales & Distribution) Limited | Wholesale & retail | 1982 |
| Ansell Electrical Products Limited | Wholesale & retail | 2001 |
| Antao & Associates Communications Limited | Professional & scientific | 2025 |
| Antenna Services (NW) Limited | Information & communication | 2004 |
| Anthea Williams Limited | Administrative & support | 2013 |
| Anthony Forrester Design Ltd | Professional & scientific | 2025 |
| Anthony Francis Group Holdings Limited | Financial services | 2021 |
| Anthony Philip James & Co Limited | Professional & scientific | 2016 |
| Anti-Germ (UK) Limited | Administrative & support | 2010 |
| Anti-Ligature Shop Ltd | Professional & scientific | 2012 |
| Antirium Ltd | Information & communication | 2017 |
| Antleshow Contracting Limited | Professional & scientific | 2013 |
| Antoda Limited | Information & communication | 2013 |
| Antonia Kirkby Limited | Health & social care | 2022 |
| Antonio Technologies Ltd | Administrative & support | 2024 |
| Antroverse Limited | Professional & scientific | 2025 |
| Anubis Hair Limited | Other services | 2023 |
| Anubis Security & Training Ltd | Administrative & support | 2024 |
| Anvilinns Ltd | Hospitality | 2025 |
| ANY Architecture Limited | Professional & scientific | 2018 |
| Anywhere Limited | Extraterritorial | 2001 |
| AO Software Development Ltd | Other services | 2019 |
| AOB Motion Ltd | Information & communication | 2021 |
| Aok-Hv Ltd | Professional & scientific | 2017 |
| AOM IT Limited | Information & communication | 2024 |
| AOM Lettings Limited | Real estate | 2021 |
| AOS Industries Ltd | Agriculture & fishing | 2026 |
| AOS Property & Land Experts Limited | Real estate | 2016 |
| AP Birkenhead Limited | Health & social care | 2020 |
| AP Hawarden Limited | Health & social care | 2018 |
| AP Lynch Civil Engineering and Surveying Limited | Administrative & support | 2014 |
| AP Manchester Limited | Health & social care | 2020 |
| AP Plan Services Ltd | Other services | 2014 |
| AP Plumbing and Heating Solutions Limited | Construction | 2023 |
| AP Specialist Care Group Ltd | Financial services | 2023 |
| AP Technical Services Ltd | Professional & scientific | 2026 |
| Apave TIV UK Ltd | Professional & scientific | 2021 |
| APB UK Services Ltd | Information & communication | 2024 |
| APC Concepts Limited | Wholesale & retail | 2002 |
| Apcm Engineering Limited | Professional & scientific | 2017 |
| Aperta Design Ltd | Wholesale & retail | 2020 |
| APETELA1 Limited | Professional & scientific | 2013 |
| Apex 102 Limited | Professional & scientific | 2025 |
| Apex Design Solutions Limited | Administrative & support | 2007 |
| Apex Development Centre Ltd | Education | 2025 |
| Apex Forge Consultancy Ltd | Professional & scientific | 2025 |
| Apex FX3 Limited | Administrative & support | 2014 |
| Apex Heat Management Ltd | Professional & scientific | 2025 |
| Apex Heat Thermal Management Ltd | Manufacturing | 2025 |
| Apex Home and Energy Surveyors Limited | Professional & scientific | 2008 |
| Apex Materials Limited | Wholesale & retail | 2022 |
| Apex Ninja Limited | Information & communication | 2024 |
| Apex Platinum Growth Limited | Real estate | 2022 |
| Apex Quality Services Ltd | Administrative & support | 2026 |
| Apex Resin Academy Ltd | Education | 2024 |
| Apex Telecommunications Limited | Administrative & support | 2022 |
| Apex Trade NW Limited | Real estate | 2021 |
| Apexops Consultancy Limited | Administrative & support | 2026 |
| APG Precision Engineering Ltd | Manufacturing | 2000 |
| APH Plumbing & Heating Ltd | Construction | 2018 |
| Apidae Project Consultancy Limited | Administrative & support | 2016 |
| APJ EOT Trustee Limited | Financial services | 2021 |
| APJ Global Holdings Ltd | Financial services | 2025 |
| APL Food Consultants Limited | Professional & scientific | 2016 |
| Apla Software Solutions Ltd | Administrative & support | 2024 |
| Aplomado Limited | Professional & scientific | 2016 |