| Ansaldo Nuclear Limited | Manufacturing | 2003 |
| Ansh Ayurveda Ltd | Transport & logistics | 2012 |
| Ansible Education Consulting Limited | Education | 2016 |
| Ansiii Enterprises Ltd | Wholesale & retail | 2026 |
| Anslow Coombs Limited | Construction | 2014 |
| Anslow Forge Limited | Real estate | 2001 |
| Ansnate Limited | Health & social care | 2023 |
| ANT Delivery Ltd | Transport & logistics | 2019 |
| Antalya IVF Ltd | Health & social care | 2025 |
| Antalya Services Ltd | Financial services | 2022 |
| Antara (UK) Limited | Transport & logistics | 2014 |
| Antelope Management Services Ltd | Other services | 2024 |
| Anthesis Property Management Ltd. | Extraterritorial | 2017 |
| Anthony Martyn Donnelly Ltd | Extraterritorial | 2025 |
| Anthony Mathews Fitted Interiors Ltd | Wholesale & retail | 2003 |
| Anti Idol Ltd | Manufacturing | 2019 |
| Anti-Snap Locks (West Midlands) Ltd | Other services | 2018 |
| Anto Logistics Ltd | Transport & logistics | 2019 |
| Antonia&Eva Ltd | Transport & logistics | 2021 |
| Antony Bagshaw Consulting Ltd | Administrative & support | 2017 |
| Antrim Associates Ltd | Professional & scientific | 2020 |
| Antrim Properties Limited | Real estate | 2008 |
| Antrix Ventures Ltd | Administrative & support | 2022 |
| Anttalya Barber Shop Ltd | Other services | 2022 |
| ANU Limited | Health & social care | 2019 |
| Anusha Hair and Beauty Salon Ltd | Other services | 2025 |
| Anvil Steels Holding Company Limited | Administrative & support | 2010 |
| Anytax Holdings Limited | Professional & scientific | 2024 |
| Anytax Midlands Limited | Professional & scientific | 2024 |
| Anytime Plumbing & Heating Ltd | Construction | 2003 |
| Aopak Ltd | Wholesale & retail | 2023 |
| AP Elite Consultancy Limited | Information & communication | 2018 |
| AP Food Services Ltd | Hospitality | 2022 |
| AP Global Ventures Ltd | Wholesale & retail | 2024 |
| AP Immigration Consultants Ltd | Professional & scientific | 2024 |
| AP Logistics and Services Ltd | Transport & logistics | 2026 |
| AP Prestige Ltd | Wholesale & retail | 2022 |
| AP Shopfitting Ltd | Construction | 2022 |
| AP Soft Furnishings Limited | Manufacturing | 2015 |
| AP8 Limited | Professional & scientific | 2024 |
| Apaka Products Ltd | Wholesale & retail | 2024 |
| Apara Group Ltd | Other services | 2017 |
| Apartment Holdings Ltd | Real estate | 2021 |
| APC Tudor Limited | Construction | 2001 |
| Apcg Training Ltd | Education | 2020 |
| Apelza Ltd | Wholesale & retail | 2026 |
| Apex Build & Motors Ltd | Construction | 2026 |
| Apex Cleaning Service (Midland) Ltd | Administrative & support | 2022 |
| Apex Cleantrepreneur Limited | Administrative & support | 2026 |
| Apex Commercial Interiors Ltd | Construction | 2026 |
| Apex Concrete Pump Ltd | Administrative & support | 2026 |
| Apex Enabling Ltd | Construction | 2023 |
| Apex Healthcare Partners Ltd | Health & social care | 2023 |
| Apex IT Devices Ltd | Wholesale & retail | 2019 |
| Apex IT Sourcing Limited | Wholesale & retail | 2021 |
| Apex Legend Limited | Hospitality | 2026 |
| Apex LEGEND01 Ltd | Hospitality | 2026 |
| Apex LEGEND02 Ltd | Hospitality | 2026 |
| Apex LEGEND03 Ltd | Hospitality | 2026 |
| Apex One Trucking Limited | Transport & logistics | 2025 |
| Apex Premier Transport Ltd | Transport & logistics | 2026 |
| Apex Relax Ltd | Hospitality | 2025 |
| Apex Retailers Limited | Wholesale & retail | 2013 |
| Apex Today Limited | Professional & scientific | 2019 |
| Apexapps Limited | Information & communication | 2021 |
| Apexdeals Ltd | Wholesale & retail | 2024 |
| Apexquick Limited | Other services | 1995 |
| Apexx Properties Ltd | Real estate | 2025 |
| APG Furniture Repair Ltd | Other services | 2020 |
| API Innovation Ltd | Information & communication | 2017 |
| Apley Design & Build Limited | Administrative & support | 2008 |
| Apley Interiors Ltd | Wholesale & retail | 2023 |
| Aplus Body Repair Pros Ltd | Wholesale & retail | 2020 |
| Aplus Hand Car Wash Ltd | Administrative & support | 2025 |
| APM Haulage Ltd | Transport & logistics | 2020 |
| Apna Carpets Flooring Ltd | Wholesale & retail | 2018 |
| Apna Dera Ltd | Hospitality | 2020 |
| Apna Punjab Furniture Ltd | Wholesale & retail | 2026 |
| Apnafinance Ltd | Information & communication | 2008 |
| Apocalypse Games Ltd | Information & communication | 2024 |
| Apocalypse Miniatures Ltd | Wholesale & retail | 2018 |
| Apogee Scintilla Ltd | Information & communication | 2015 |
| Apollo and Athena Estates Limited | Real estate | 2024 |
| Apollo Entertainments Ltd | Arts & recreation | 2025 |
| Apollo Home Healthcare Holdings Limited | Professional & scientific | 2015 |
| Apollo Home Healthcare Limited | Administrative & support | 2014 |
| Apollo Wholesale Ltd | Wholesale & retail | 2022 |
| App Monkeys Ltd | Information & communication | 2022 |
| Apparel Avenue Ltd | Manufacturing | 2024 |
| Apperly Properties Limited | Real estate | 2022 |
| Apple Glass Company Ltd | Manufacturing | 2022 |
| Apple Signs and Installations Limited | Manufacturing | 2017 |
| Apple Trees Nursery Ltd | Health & social care | 2021 |
| Applecore Robotics Ltd | Administrative & support | 2020 |
| Apples Home Care Services Ltd | Health & social care | 2021 |
| Appleton Innovations Ltd | Information & communication | 2021 |
| Appletrees Estate Ltd | Real estate | 2022 |
| Applewood Construction Limited | Construction | 2019 |
| Applied Interests Limited | Information & communication | 2012 |
| Applied Security Solutions Ltd | Administrative & support | 2022 |