| Appoint-Ed Support Staff Ltd | Administrative & support | 2020 |
| Appollo Self Storage Ltd | Transport & logistics | 2013 |
| Apprehend Limited | Information & communication | 2015 |
| Approachable Certification Ltd | Professional & scientific | 2013 |
| Approved PAT Testing Ltd | Construction | 2013 |
| Appspark Ltd | Information & communication | 2020 |
| Apptovate Limited | Information & communication | 2022 |
| Appu MED Limited | Health & social care | 2016 |
| Appulse Ltd | Information & communication | 2026 |
| Appvertise Ltd | Wholesale & retail | 2015 |
| Appy Hub Ltd | Information & communication | 2024 |
| Appzon Holdings Ltd | Real estate | 2024 |
| Appzon Technologies Ltd. | Information & communication | 2014 |
| APR Consulting Group Limited | Professional & scientific | 2026 |
| APR Tuning (UK) Limited | Real estate | 2014 |
| Apres Lamour & Co Ltd | Health & social care | 2023 |
| April 16 Ltd | Hospitality | 2022 |
| April North Investment Ltd | Real estate | 2023 |
| April North Pharmaceutical Ltd | Health & social care | 2022 |
| APRILGORDON14 Limited | Administrative & support | 2025 |
| Après Clothing Ltd | Wholesale & retail | 2023 |
| APS Cladding PM Ltd | Real estate | 2022 |
| APS Project Solutions Limited | Extraterritorial | 2021 |
| Apse F&V Ltd | Wholesale & retail | 2024 |
| Apse Ltd | Wholesale & retail | 2013 |
| Apse Synergy Limited | Professional & scientific | 2025 |
| Apsl Business Ltd | Wholesale & retail | 2016 |
| Apsley Property Group Ltd | Real estate | 2025 |
| Apsleyhome Limited | Extraterritorial | 1983 |
| APT & Able Apparel Ltd | Wholesale & retail | 2022 |
| APT Home Solutions Ltd | Construction | 2022 |
| APT Security Systems Limited | Administrative & support | 2017 |
| APT Support Services Ltd | Professional & scientific | 2021 |
| Aptacode Ltd | Information & communication | 2019 |
| Aptae Ltd | Financial services | 2021 |
| Aptiserve Group Ltd | Information & communication | 2023 |
| Aptracking Ltd | Information & communication | 2023 |
| Aptsm Limited | Extraterritorial | 2015 |
| Aptus Search Ltd | Administrative & support | 2024 |
| Apuk Capital Ltd | Financial services | 2025 |
| Apuk Construction Ltd | Construction | 2008 |
| Apuk Group Ltd | Administrative & support | 2017 |
| Apuk Group TYH Ltd | Wholesale & retail | 2023 |
| Apusya Trading Company Ltd | Hospitality | 2026 |
| APV Overseas Holdings Limited | Professional & scientific | 1929 |
| APW Property UK Ltd | Real estate | 2023 |
| Apwright.Net Ltd | Other services | 2013 |
| Apythox Technologies Ltd | Extraterritorial | 2024 |
| APZ International Ltd | Wholesale & retail | 2020 |
| AQ Brands Ltd | Wholesale & retail | 2025 |
| AQ Finance Ltd | Financial services | 2018 |
| AQ Global Estates Ltd | Real estate | 2023 |
| AQ Investments Limited | Construction | 2013 |
| AQ Logistics Services Limited | Transport & logistics | 2018 |
| AQ Properties MCR Ltd | Real estate | 2020 |
| AQ Property Group Ltd | Real estate | 2023 |
| AQ Sellers Limited | Wholesale & retail | 2023 |
| AQA Assessment Services Limited | Information & communication | 2005 |
| AQA Commercial Services Limited | Financial services | 2022 |
| AQA Group Ltd | Financial services | 2023 |
| AQA Head Office Ltd | Financial services | 2026 |
| AQA Investments Ltd | Real estate | 2024 |
| AQA Management Ltd | Health & social care | 2023 |
| Aqas Investments Limited | Wholesale & retail | 2023 |
| Aqash Builders Ltd | Construction | 2023 |
| Aqaz Investments Ltd | Wholesale & retail | 2023 |
| AQB Dermatology Services Ltd | Health & social care | 2023 |
| Aqel Alyafeai Company Ltd | Wholesale & retail | 2026 |
| Aqib Fiaz Boxing Ltd | Arts & recreation | 2024 |
| Aqquila UK Ltd | Hospitality | 2020 |
| AQR Properties Limited | Extraterritorial | 2019 |
| Aqsa Naseer Limited | Other services | 2024 |
| Aqsa Property Group Ltd | Real estate | 2025 |
| Aqsas Clothing Ltd | Wholesale & retail | 2018 |
| Aqsportsfashion Ltd | Wholesale & retail | 2023 |
| Aqtaz Trading Limited | Wholesale & retail | 2023 |
| Aqua Babies (UK) Ltd | Education | 2003 |
| Aqua MCR UK Ltd | Wholesale & retail | 2025 |
| Aqua Moda Limited | Wholesale & retail | 2007 |
| Aqua Nexus LAB Limited | Wholesale & retail | 2024 |
| Aqua Plumbing Solutions Limited | Construction | 2013 |
| Aqua Right (UK) Limited | Extraterritorial | 2012 |
| Aqua Right Supplies Limited | Extraterritorial | 2012 |
| Aqua Style Beds Limited | Wholesale & retail | 2016 |
| Aqua Terra INT Ltd | Wholesale & retail | 2019 |
| Aqua-Logic Controls Ltd | Manufacturing | 2025 |
| Aquacleanse Limited | Administrative & support | 2001 |
| Aquacool Ltd. | Wholesale & retail | 1999 |
| Aquaculture Equipment Limited | Manufacturing | 2002 |
| Aquadia Jewellery Ltd | Manufacturing | 2025 |
| Aquadynamic Holdings Limited | Households | 2026 |
| Aquafield Trading & Investment Limited | Wholesale & retail | 2022 |
| Aqualuxe Limited | Wholesale & retail | 2016 |
| Aqualyze Limited | Wholesale & retail | 2023 |
| Aquamatic Fire UK Ltd | Construction | 2012 |
| Aquamatic Group Limited | Financial services | 2020 |
| Aquamatic Limited | Manufacturing | 1991 |
| Aquaminds Ltd | Information & communication | 2025 |
| Aquapak Polymers Ltd | Manufacturing | 2005 |
| Aquariadise Limited | Wholesale & retail | 2022 |