| Apcme Limited | Real estate | 2023 |
| Apcon Media Limited | Administrative & support | 2019 |
| APE Aqua Pro Exteriors Limited | Administrative & support | 2025 |
| Apek Interiors Ltd | Construction | 2014 |
| Apem (UK) Ltd | Hospitality | 2010 |
| Apetri DC Transport Limited | Transport & logistics | 2026 |
| Apex Cricket Academy Ltd | Education | 2022 |
| Apex Financial Consulting Limited | Professional & scientific | 2023 |
| Apex Food Supplies Ltd | Wholesale & retail | 2025 |
| Apex Group Private Ltd | Administrative & support | 2025 |
| Apex Illuminations Ltd | Construction | 2024 |
| Apex IT Communications Ltd | Information & communication | 2023 |
| Apex Learning Center Ltd | Education | 2019 |
| Apex Lifestyle Ltd | Wholesale & retail | 2005 |
| Apex Premises Security Ltd | Administrative & support | 2026 |
| Apex Pro Construction Ltd | Construction | 2021 |
| Apex Residential Investments Ltd | Real estate | 2025 |
| Apex Roofing and Guttering Ltd | Construction | 2025 |
| Apex Support Solutions Ltd | Administrative & support | 2026 |
| Apex UK Investment Ltd | Real estate | 2020 |
| Apex Yard Management Company (Commercial) Limited | Administrative & support | 2005 |
| Apex Yard Management Company Limited | Households | 2002 |
| Apex Zambrano Ltd | Professional & scientific | 2025 |
| Apexium Ltd | Wholesale & retail | 2025 |
| Apfs Property Ltd | Real estate | 2017 |
| Aphyx Ltd | Professional & scientific | 2009 |
| Apits Limited | Information & communication | 2008 |
| APJ Group Limited | Real estate | 2022 |
| APM Consultants (CA) Ltd | Professional & scientific | 2009 |
| APM Healthcare Limited | Professional & scientific | 2009 |
| APM Hire Limited | Administrative & support | 2016 |
| Apna Group UK Limited | Construction | 2018 |
| Apna Roofing Limited | Construction | 2020 |
| Apogee (UK) Management Ltd | Real estate | 2014 |
| Apollo 77 Ltd | Wholesale & retail | 2018 |
| Apollo Future Technology Ltd | Wholesale & retail | 2011 |
| Apollo Investment Group Limited | Financial services | 2011 |
| Apollo Research Management Services Ltd | Administrative & support | 2022 |
| Apollogrid Limited | Wholesale & retail | 2024 |
| Apostille and Legalisation Services Ltd | Professional & scientific | 2017 |
| Apostolic Faith Assembly | Health & social care | 2014 |
| Apothecary IV Limited | Health & social care | 2020 |
| App Enterprises Limited | Construction | 2022 |
| App Tours & Transport Ltd | Transport & logistics | 2025 |
| Apparel Investment Limited | Financial services | 2015 |
| Appiason Properties Limited | Real estate | 2021 |
| Appiason Sports Management Limited | Arts & recreation | 2016 |
| Apple Hills Investments Limited | Financial services | 2011 |
| Appledore Consultants Limited | Administrative & support | 2018 |
| Applegrow Ltd | Health & social care | 2018 |
| Applesham Limited | Households | 1988 |
| Appliance Care Direct Ltd | Other services | 2018 |
| Appliance Sure Ltd | Other services | 2019 |
| Appliances for YOU Limited | Wholesale & retail | 2018 |
| Appliances Trader London Limited | Construction | 2023 |
| Apply Yourself Ltd | Education | 2019 |
| Appraisals Abound Limited | Professional & scientific | 2011 |
| Apprendre L'Anglais Limited | Education | 2013 |
| Approved Roofing London Ltd | Construction | 2020 |
| Approved Refurbs Builds Limited | Construction | 2026 |
| Apricus Analytics Ltd | Information & communication | 2025 |
| April Enan Limited | Education | 2020 |
| APS Food Ltd | Hospitality | 2018 |
| Apsara Arts | Arts & recreation | 2004 |
| Aptly Managed Ltd | Households | 2021 |
| AQ Bar Limited | Hospitality | 2025 |
| AQ Brandingsolutions Limited | Professional & scientific | 2016 |
| AQ Buy to LET Limited | Real estate | 2025 |
| AQC London Limited | Real estate | 2021 |
| Aqib Shahzaib UK Ltd | Hospitality | 2024 |
| AQJ Ventures Enterprise Ltd | Wholesale & retail | 2025 |
| Aqla Investments Ltd | Real estate | 2023 |
| Aqsa Investments Ltd | Real estate | 2013 |
| Aqua Blue Cleaning and Support Services Ltd | Administrative & support | 2006 |
| Aqua in Bocca Ltd | Hospitality | 2025 |
| Aqua Sanitas Ltd | Professional & scientific | 2022 |
| Aqua Works Plumbing Ltd | Construction | 2007 |
| Aquaclean Group Ltd | Administrative & support | 2021 |
| Aquacleanmaintenance Ltd | Construction | 2022 |
| Aquahigh Limited | Health & social care | 2011 |
| Aquarian Broadcast Group Limited | Professional & scientific | 2012 |
| Aquarius Scaffolding Limited | Construction | 2003 |
| Aquaskills Limited | Arts & recreation | 2015 |
| Aquatico Management Company Limited | Real estate | 2005 |
| Aquatutors Ltd | Education | 2025 |
| Aqueous Productions Ltd | Professional & scientific | 2026 |
| Aquila Homes Property Ltd | Households | 2026 |
| AR & Partners Limited | Wholesale & retail | 2012 |
| AR Companions Ltd | Administrative & support | 2025 |
| AR Constructions Consultancy Ltd | Construction | 2025 |
| AR Hypnotherapy Ltd | Health & social care | 2019 |
| AR Meals Ltd | Hospitality | 2024 |
| AR PCO Hire Ltd | Administrative & support | 2023 |
| AR Professional Chauffeur Services Limited | Administrative & support | 2024 |
| AR Squared Limited | Professional & scientific | 2020 |
| AR Traders Limited | Administrative & support | 2023 |
| Ar-Rahmat Limited | Information & communication | 2015 |
| ARA FT Investment Ltd | Real estate | 2021 |
| Arabella Foods Limited | Wholesale & retail | 2002 |
| Arabella Nuts & Confectionery Limited | Manufacturing | 2011 |