| Angel Investment Group Ltd | Real estate | 2022 |
| Angel Protection Limited | Real estate | 2023 |
| Angel Support Living Ltd | Health & social care | 2005 |
| Angel Supported Homes Limited | Health & social care | 2008 |
| Angel Tattooz Limited | Administrative & support | 2009 |
| Angel Toys Limited | Wholesale & retail | 1992 |
| Angelspool Investment Ltd | Financial services | 2014 |
| Anglo Dutch Premium Services LLP | | 2022 |
| Anglo Scottish Leisure Limited | Arts & recreation | 1988 |
| Anglo Woods Limited | Construction | 2017 |
| Angry Monkey Ltd | Information & communication | 2013 |
| Anguleris Technologies Ltd | Professional & scientific | 2017 |
| Anika Studies Ltd | Professional & scientific | 2026 |
| Animum Ltd | Information & communication | 2011 |
| Anivith Ltd | Wholesale & retail | 2017 |
| Ankidu Collection Ltd | Wholesale & retail | 2019 |
| Ankyra Property Limited | Real estate | 2025 |
| Anlo Consulting Ltd | Professional & scientific | 2022 |
| Anmersh Ltd | Financial services | 2026 |
| Anna Carpentry Ltd | Construction | 2015 |
| Anna Urbaniak Consulting Ltd | Professional & scientific | 2014 |
| Annaverna Limited | Real estate | 2001 |
| Anne Retail Shop Ltd | Wholesale & retail | 2025 |
| Anne Wright Marketing Ltd | Professional & scientific | 2026 |
| Annemarie Sterian Ltd | Professional & scientific | 2026 |
| Anogeo Limited | Professional & scientific | 2022 |
| Anointed Limited | Health & social care | 2021 |
| Anorasoft Solutions Limited | Information & communication | 2019 |
| Anosman Ltd | Construction | 2023 |
| Anoushaa Limited | Professional & scientific | 1991 |
| ANP FTS Ltd | Professional & scientific | 2015 |
| ANS 2018 Ltd | Other services | 2019 |
| Ansambli Artistik Lura Ltd | Arts & recreation | 2024 |
| Anscorp Limited | Professional & scientific | 2012 |
| Ansville Properties Limited | Real estate | 2023 |
| Antarchitecture Ltd | Professional & scientific | 2024 |
| Antenna Interactive Limited | Information & communication | 2009 |
| Anthony Llewellyn Consulting Ltd | Professional & scientific | 2017 |
| Anthony Short Antiques Limited | Wholesale & retail | 2008 |
| Antler Development Holdings Ltd | Real estate | 2023 |
| Antler Developments Ltd | Real estate | 2020 |
| Antonio Kiri Joseph Giovanni Ltd | Extraterritorial | 2024 |
| Antoniou Investments Limited | Real estate | 2014 |
| Antonious Limited | Real estate | 2015 |
| Antony Derek Jones Limited | Extraterritorial | 2025 |
| Antor & Co Limited | Administrative & support | 2026 |
| Ants Removals 2 Ltd | Transport & logistics | 2023 |
| Anvit Consulting Ltd | Information & communication | 2019 |
| Anvit Properties Ltd | Real estate | 2017 |
| Anypallet Logistics Ltd | Transport & logistics | 2022 |
| Anysize Pallets T-A ASP Ltd. | Administrative & support | 2017 |
| AOB Partners Ltd | Professional & scientific | 2018 |
| Aoglrr Real Estate Limited | Real estate | 2025 |
| AP Construction (London) Limited | Construction | 2011 |
| AP Engineering & Construction Ltd | Construction | 2026 |
| AP Goldman Ltd | Wholesale & retail | 2020 |
| AP8 Property Solutions Ltd | Real estate | 2020 |
| APB Future Limited | Real estate | 2021 |
| Apcon Consultancy Limited | Information & communication | 2019 |
| Aperture Surveying Limited | Professional & scientific | 2026 |
| Apex Business Centre Management Company Limited | Real estate | 1988 |
| Apex Fire Doors Ltd | Construction | 2024 |
| Apex Lodge Management Company Limited | Households | 1982 |
| Apex Sovereign Ltd | Professional & scientific | 2023 |
| Apex Techno Limited | Information & communication | 2013 |
| Apex Utilities Ltd | Energy | 2022 |
| Apexnode Ltd | Wholesale & retail | 2025 |
| APG Horizon Limited | Real estate | 2021 |
| Aplexia Pharma Limited | Manufacturing | 2023 |
| Apnv Ltd | Real estate | 2022 |
| Apollo Zone Limited | Professional & scientific | 2024 |
| Apollonia 258 Ltd | Real estate | 2021 |
| Appeal Guru Limited | Administrative & support | 2018 |
| Appier UK Co., Ltd. | Professional & scientific | 2019 |
| Apple Green Montessori Preschool Limited | Education | 2020 |
| Appleby UK Electrical Ltd | Construction | 2015 |
| Apppay Management Limited | Professional & scientific | 2017 |
| Approved International Products Limited | Health & social care | 2009 |
| Appsync Technologies Ltd | Information & communication | 2023 |
| Apptop Ltd | Information & communication | 2012 |
| APR Holdings Ltd | Real estate | 2019 |
| Aptaker & Partners Limited | Other services | 2011 |
| Apvr Limited | Health & social care | 2002 |
| APX Properties Ltd | Real estate | 2026 |
| Apxpress Holdings Limited | Professional & scientific | 2017 |
| Aqua Heroes Ltd | Education | 2017 |
| Aquakare Limited | Construction | 1999 |
| Aqualiving Villas Limited | Administrative & support | 2022 |
| Aquarion Limited | Real estate | 2023 |
| Aquaworks Bathroom Specialist Limited | Wholesale & retail | 2022 |
| Aquis Hotels Limited | Hospitality | 2011 |
| AR Collinson Building Consultancy Ltd | Professional & scientific | 2015 |
| ARA Haulage Ltd | Construction | 2019 |
| Araari Ltd | Real estate | 2021 |
| Aralan Properties Limited | Real estate | 2022 |
| Aran Drive Management Limited | Households | 1970 |
| Arbet Mashin Ltd | Information & communication | 2022 |
| ARC Portfolio Ltd | Real estate | 2011 |
| Arcadia Property Investments Ltd | Real estate | 2021 |
| Archers Accountants Limited | Professional & scientific | 2005 |