| Advance Group London Limited | Construction | 2012 |
| Advance Heating & Electricals Ltd | Construction | 2011 |
| Advance Medic Services Ltd | Health & social care | 2019 |
| Advance Merchant Services Ltd | Wholesale & retail | 2024 |
| Advance Traders Limited | Information & communication | 2002 |
| Advance Wages Ltd | Administrative & support | 2018 |
| Advanced Business Equipment Holdings Limited | Construction | 2008 |
| Advanced Heating Solutions Ltd | Construction | 2022 |
| Advanced Information Resourcing Limited | Professional & scientific | 1994 |
| Advanced Medical Aesthetics S & N LLP | | 2024 |
| Advanced Rheumatology Limited | Health & social care | 2012 |
| Advancetwentyone Limited | Professional & scientific | 2012 |
| Advani Holdings Ltd | Real estate | 2020 |
| Advantage H London Limited | Real estate | 2025 |
| Advantage Hotels (Walsall) Ltd | Hospitality | 2003 |
| Advent Care Solutions Ltd | Hospitality | 2014 |
| Advent Financial Services Limited | Financial services | 2021 |
| Advent Prop Limited | Real estate | 2025 |
| Advertising Analytics Limited | Health & social care | 2015 |
| Advice on Pensions Limited | Financial services | 2008 |
| Advice Point Group Ltd. | Financial services | 2016 |
| Advicorp Public Limited Company | Financial services | 1997 |
| Adviseruk Ltd | Wholesale & retail | 2023 |
| ADW Developments Limited | Professional & scientific | 2009 |
| Adwater Limited | Extraterritorial | 2003 |
| Adwc Ltd | Financial services | 2025 |
| Adwith Ltd | Information & communication | 2020 |
| ADY Rail Solution Limited | Other services | 2015 |
| Adya Events Ltd | Hospitality | 2025 |
| AE Scaffolding Ltd | Construction | 2007 |
| AEA Construction & Design Ltd | Construction | 2023 |
| Aecc Global Limited | Education | 2022 |
| AED Words Ltd | Professional & scientific | 2015 |
| Aegean Diving Services Limited | Construction | 2011 |
| Aegis Outsourcing UK Limited | Administrative & support | 2006 |
| AEH Media Ltd | Information & communication | 2026 |
| AEL Infotech Limited | Information & communication | 2020 |
| Aelius Venture Limited | Information & communication | 2020 |
| AEN Healthcare Limited | Health & social care | 2016 |
| Aeoav Limited | Other services | 2025 |
| Aeon (Hatchend) Properties Ltd | Real estate | 2020 |
| Aeon New Homes Ltd | Professional & scientific | 2023 |
| Aeon Properties Limited | Real estate | 2020 |
| Aeon Property Group Ltd | Real estate | 2023 |
| Aeon Recruitment Limited | Administrative & support | 2022 |
| Aeon Retail Limited | Real estate | 2020 |
| Aequitas Management Solution (UK) Limited | Professional & scientific | 2026 |
| AER Rents Limited | Financial services | 2014 |
| Aeronomics Consulting Ltd | Professional & scientific | 2024 |
| Aerostrike Vehicles Limited | Manufacturing | 2024 |
| Aerox Mechtech Ltd | Manufacturing | 2025 |
| Aersy Ltd | Wholesale & retail | 2016 |
| AES Building Development Ltd | Real estate | 2024 |
| AES Capital Ltd | Real estate | 2022 |
| AES Capital VAT Ltd | Real estate | 2026 |
| Aeshu Limited | Wholesale & retail | 2025 |
| Aesthetic Clinic Harrow Ltd | Health & social care | 2014 |
| Aesthetics by DR. Nisha Ltd | Health & social care | 2019 |
| AETHER72LONDON Ltd | Manufacturing | 2026 |
| Aetti Home Care Limited | Administrative & support | 2024 |
| Aeventia Limited | Professional & scientific | 2017 |
| AFA Fostering Ltd | Financial services | 2013 |
| Afaq AL Husan Trading & Construction Ltd | Construction | 2024 |
| Affan Limited | Wholesale & retail | 2025 |
| Affiliatik Limited | Professional & scientific | 2016 |
| Affinity Global Limited | Financial services | 2013 |
| Affluence Investment Ltd | Professional & scientific | 2017 |
| AFG Skippers Limited | Hospitality | 2025 |
| AFG Trade Ltd | Real estate | 2022 |
| AFG Transportation Ltd | Transport & logistics | 2024 |
| Afghan and Asian Grill Ltd | Hospitality | 2025 |
| Afghan Street Kitchen Limited | Wholesale & retail | 2026 |
| Afghan Thread Ltd | Wholesale & retail | 2025 |
| Afghan Travel Centre Limited | Administrative & support | 2002 |
| Afghanistan Ifaspfd Investment Ltd | Financial services | 2026 |
| Afghanistan Peace and Justice Supporters Organisation (Apjso) CIC | Public administration | 2024 |
| Afghanistan Sports Foundation | Arts & recreation | 2024 |
| Afghans Common House in UK CIC | Education | 2024 |
| Afgs Consultants Limited | Professional & scientific | 2005 |
| AFH Financial Services Limited | Information & communication | 2017 |
| AFH Properties Limited | Real estate | 2016 |
| AFK Training & Development Ltd | Professional & scientific | 2008 |
| Afkar Consulting Ltd | Information & communication | 2003 |
| Afkar Limited | Information & communication | 1988 |
| Afkar Services LLP | | 2009 |
| AFM Transport Limited | Transport & logistics | 2009 |
| AFO Family Ltd | Real estate | 2023 |
| Afra Consulting Limited | Administrative & support | 2016 |
| Africa Adventures Bidco Limited | Financial services | 2025 |
| Africa Adventures Investco Limited | Financial services | 2025 |
| Africa Logistic Estate Limited | Real estate | 2015 |
| Africa Logistic Properties Limited | Real estate | 2015 |
| Africa Practice Limited | Professional & scientific | 2000 |
| Africa Travel Investments Limited | Financial services | 2025 |
| African Centre for Security Ltd | Professional & scientific | 2024 |
| African Education Investments Limited | Education | 2019 |
| African Flower Ltd | Health & social care | 2020 |
| Afrika Tikkun UK | Education | 2003 |
| Afrixion Ltd | Wholesale & retail | 2023 |
| Afro and Caribbean Halal Meat Ltd | Wholesale & retail | 2023 |