| Apex Analysis Limited | Information & communication | 2011 |
| Apex Bros. Ltd | Wholesale & retail | 2019 |
| Apex Design Construction Ltd | Construction | 2024 |
| Apex Fitness Coaching Ltd | Education | 2023 |
| Apex Homeware Ltd | Wholesale & retail | 2024 |
| Apex Marine Solutions Ltd | Manufacturing | 2017 |
| Apex Meridian Ltd | Professional & scientific | 2026 |
| Apex Outdoor Spaces Ltd | Construction | 2019 |
| Apex Practice Management Limited | Administrative & support | 2025 |
| Apex Prime Care Ltd | Health & social care | 2001 |
| Apex Pro Carpentry Ltd | Construction | 2020 |
| Apex Roofing & Cladding Solutions Limited | Administrative & support | 2026 |
| Apex V and C Limited | Wholesale & retail | 2025 |
| Apex Valor Limited | Wholesale & retail | 2026 |
| Apex Vape & Candy Limited | Hospitality | 2025 |
| Apexall Ltd | Wholesale & retail | 2025 |
| APF Projects Limited | Construction | 2011 |
| Aphex Home Installations Limited | Construction | 2010 |
| Apiasecki Transport Limited | Transport & logistics | 2026 |
| Apic Technology Limited | Information & communication | 2022 |
| APJ Trade Ltd | Wholesale & retail | 2023 |
| APL & ZCM Construction Ltd | Construction | 2012 |
| APL Trans Ltd | Transport & logistics | 2016 |
| Apmc Limited | Households | 2000 |
| APN Engineers Limited | Professional & scientific | 2017 |
| Apoddo LLP | | 2021 |
| Apollo Building and Maintenance Limited | Construction | 2022 |
| Apollo Business Supplies Limited | Wholesale & retail | 2011 |
| Apollo Energy Limited | Professional & scientific | 2000 |
| Apollo Facilities Services Limited | Construction | 2016 |
| Apollo Medical Group Ltd | Health & social care | 2025 |
| Apollo Place Residents Management Company Limited | Households | 2003 |
| Apollonet Ltd | Information & communication | 2024 |
| Apothecary Potions Ltd | Manufacturing | 2021 |
| Apothicarius Limited | Health & social care | 2012 |
| App Creators Limited | Information & communication | 2025 |
| Apphost Ltd | Information & communication | 2016 |
| Appintegro Ltd | Extraterritorial | 2023 |
| Apple Solar Limited | Construction | 2010 |
| Apple Tree Architecture Ltd | Professional & scientific | 2019 |
| Apple Tree Day Nursery (Portsmouth) Limited | Education | 2012 |
| Apple Tree Design and Construction Ltd | Construction | 2024 |
| Apple Tree Mortgage Services Ltd | Financial services | 2020 |
| Apple Tree Real Estate Ltd | Real estate | 2025 |
| Applecore Construction & Maintenance Ltd | Construction | 2025 |
| Applecore Design and Develop Ltd | Real estate | 2018 |
| Applecore Living Ltd | Real estate | 2021 |
| Applecore PDM Ltd. | Real estate | 2020 |
| Applecore Property Group Limited | Real estate | 2025 |
| Applewood 1960 Limited | Extraterritorial | 2013 |
| Appley Manor Limited | Hospitality | 2026 |
| Applied Energy Products Ltd | Professional & scientific | 2001 |
| Applied FEA Limited | Professional & scientific | 2009 |
| Applied Finance Limited | Financial services | 1980 |
| Apposita Limited | Information & communication | 2010 |
| Approved Property Maintenance Limited | Administrative & support | 2018 |
| Apps Buddies Limited | Information & communication | 2025 |
| Apps Leisure Ltd | Information & communication | 2024 |
| Apptrad Ltd | Wholesale & retail | 2008 |
| Appy AI Ltd | Information & communication | 2026 |
| Appyzip Ltd | Information & communication | 2025 |
| APS Heating Ltd | Construction | 2020 |
| APS Home Improvements Ltd | Construction | 2021 |
| APS Property Developments Ltd | Construction | 2013 |
| Apsl Technical Limited | Manufacturing | 2008 |
| Apss IT Solutions Ltd | Information & communication | 2012 |
| Aptile Ltd | Information & communication | 2004 |
| Apto Accounting Limited | Professional & scientific | 2013 |
| Aptobility Limited | Professional & scientific | 2024 |
| Aptolink Limited | Information & communication | 2017 |
| Aptum Adjuvants Limited | Professional & scientific | 2020 |
| Aptum Biologics Limited | Professional & scientific | 2013 |
| Apuwat Solutions Limited | Real estate | 2021 |
| Aqass Limited | Professional & scientific | 2016 |
| Aqua Elite Biocare Ltd | Wholesale & retail | 2024 |
| Aqua Laundry Services Ltd | Other services | 2023 |
| Aqua Pacific (UK) Limited | Wholesale & retail | 2004 |
| Aqua Shine Exteriors Ltd | Administrative & support | 2022 |
| Aqua Superpower Ltd | Administrative & support | 2025 |
| Aqua-Marine International Limited | Extraterritorial | 2004 |
| Aqua-Pure Elite Window Cleaning Services Limited | Administrative & support | 2020 |
| Aquacat Boats Ltd | Manufacturing | 2024 |
| Aqualyze Systems Ltd | Wholesale & retail | 2024 |
| Aquanaut Plumbing & Heating Ltd | Construction | 2011 |
| Aquarius Homes Limited | Real estate | 2022 |
| Aquashell Ltd | Administrative & support | 2025 |
| Aquatec Plumbing & Heating Services Limited | Extraterritorial | 2000 |
| Aquawaves Limited | Other services | 2008 |
| Aquesnis Limited | Information & communication | 2010 |
| Aquidium Limited | Information & communication | 2008 |
| Aquila Legacy Holdings Ltd | Real estate | 2025 |
| Aquila Project Services Ltd | Construction | 2024 |
| Aquilo Air Limited | Professional & scientific | 2018 |
| Aquirios Limited | Health & social care | 2014 |
| Aquis Haircare UK Ltd | Wholesale & retail | 2016 |
| AR Bespoke Jewellers Ltd | Wholesale & retail | 2023 |
| AR Event Contracting Ltd | Construction | 2025 |
| AR Innoteq Limited | Professional & scientific | 2020 |
| AR Tanoli Limited | Wholesale & retail | 2025 |
| AR Zuned & Co Ltd. | Professional & scientific | 2012 |