| Adans Hive Ltd | Professional & scientific | 2020 |
| Adapt View Ltd | Construction | 2018 |
| Adarash Construction Limited | Construction | 2015 |
| Adbits PVT. Limited | Information & communication | 2016 |
| Adddtobasket Ltd | Wholesale & retail | 2020 |
| Addsum Consultants Limited | Professional & scientific | 2016 |
| Aden Home Care Ltd | Other services | 2024 |
| Adenco Consulting Ltd | Information & communication | 2007 |
| Adept Contractors Ltd | Construction | 2015 |
| Aderemi Services (UK) Limited | Health & social care | 2010 |
| Adferg Limited | Financial services | 2011 |
| ADG Consultancy International Ltd | Financial services | 2023 |
| Adhere Advertisement and Consultancy Limited | Information & communication | 2019 |
| Adhya Decorating Limited | Construction | 2025 |
| Adhya Tours & Travel Ltd | Administrative & support | 2023 |
| ADI MAX Painting Ltd | Construction | 2023 |
| ADI Systems Ltd | Information & communication | 2013 |
| ADI Systems Maintenance Ltd | Information & communication | 2017 |
| Adil Catering Limited | Hospitality | 1983 |
| Adil Restaurants Limited | Financial services | 2010 |
| Adila Satellites Limited | Manufacturing | 2009 |
| Adilson Limited | Financial services | 2010 |
| Adilsons Properties Limited | Real estate | 1998 |
| ADK Driving School Ltd | Education | 2025 |
| Adks Medical Services Ltd | Health & social care | 2025 |
| Adler Limited | Financial services | 2006 |
| Adler Management 2013 Limited | Other services | 2013 |
| Adlink (UK) Limited | Wholesale & retail | 2013 |
| Adlink Limited | Real estate | 1984 |
| Adliya UK Ltd | Real estate | 2020 |
| ADN Management Company Ltd | Real estate | 2010 |
| Adora Hair Ltd | Other services | 2023 |
| Adorn Hair & Beauty Limited | Other services | 2015 |
| Adornmakers Ltd | Wholesale & retail | 2023 |
| ADP1 Limited | Real estate | 2022 |
| Adplot Limited | Real estate | 1987 |
| ADR Building Consultancy Ltd | Real estate | 2013 |
| ADR Property Commercial Ltd | Real estate | 2024 |
| Ads-Msolutions Limited | Construction | 2017 |
| Adsco International Limited | Wholesale & retail | 2013 |
| ADT Consultancy Ltd | Professional & scientific | 2026 |
| Advait (Management) Ltd | Other services | 2005 |
| Advait Infotech Ltd | Wholesale & retail | 2025 |
| Advance Cleaning and Maintenance Services Ltd | Administrative & support | 2023 |
| Advanced Drainage and Flood Prevention Ltd | Construction | 2026 |
| Advanced in Services Ltd | Professional & scientific | 2006 |
| Advanced Security Installers Ltd | Construction | 2016 |
| Advice Xpres Ltd | Professional & scientific | 2007 |
| Advisors Way LLP | | 2024 |
| Adwait AM Group Ltd | Wholesale & retail | 2024 |
| ADY Rail 2023 Limited | Construction | 2023 |
| ADZ Beemerz Limited | Wholesale & retail | 2012 |
| Aegean Global Ltd | Wholesale & retail | 2025 |
| Aelia Property Investments Ltd | Real estate | 2025 |
| Aerie Homes Ltd | Real estate | 2019 |
| Aeroft Limited | Professional & scientific | 2015 |
| Aeroloop AI Limited | Information & communication | 2026 |
| Aesary Ltd | Information & communication | 2025 |
| Aesthetic Charm Ltd | Wholesale & retail | 2024 |
| Aesthetic Lounge London Limited | Health & social care | 2022 |
| Aestheticare by PA Ltd | Health & social care | 2025 |
| AESTHORA06 Limited | Wholesale & retail | 2026 |
| AESTHORA30 Limited | Wholesale & retail | 2026 |
| AF BUS Limited | Transport & logistics | 2025 |
| AF Business Advisory Limited | Professional & scientific | 2022 |
| AFA Construction Ltd | Construction | 2017 |
| AFA Freight Ltd | Transport & logistics | 2025 |
| Afdhal Hussain Sanitary Contracting UK Limited | Construction | 2022 |
| Affan Tech Ltd | Wholesale & retail | 2024 |
| Affinity (Holdings) Limited | Administrative & support | 2014 |
| Affinity Associates (Cambridge) Limited | Professional & scientific | 2002 |
| Affinity Associates (JTA) Limited | Professional & scientific | 2008 |
| Affinity Associates (Richmond) Ltd | Professional & scientific | 2009 |
| Affinity Associates Franchising Limited | Administrative & support | 2024 |
| Affinity Associates Limited | Professional & scientific | 2010 |
| Affinity Associates Properties Limited | Real estate | 2026 |
| Affinity Associates Subscription Services Limited | Administrative & support | 2024 |
| Affinity Associates Training Limited | Administrative & support | 2024 |
| Affinity Bookkeeping Limited | Professional & scientific | 2007 |
| Affinity Group Financial Services Limited | Financial services | 2021 |
| Affinity Smart Limited | Information & communication | 2003 |
| AFFINITY18 Limited | Arts & recreation | 2017 |
| Affy Express Ltd | Wholesale & retail | 2022 |
| AFG United Trading Ltd | Wholesale & retail | 2018 |
| Afghan Artisan Bakery Limited | Wholesale & retail | 2026 |
| Afghansmart Limited | Information & communication | 2020 |
| Afimi Treats Ltd | Wholesale & retail | 2025 |
| Afiyah Healthcare Ltd | Public administration | 2021 |
| AFJ Investments Ltd | Real estate | 2017 |
| Afmart Itab Ltd | Professional & scientific | 2020 |
| AFR Media Ltd | Arts & recreation | 2017 |
| Africa Missions Engld | Professional & scientific | 2004 |
| African Beverage Corporation Ltd | Financial services | 2021 |
| Africanik Enterprises Alkebuland Limited | Wholesale & retail | 2025 |
| Afro Merchant Ltd | Wholesale & retail | 2025 |
| AG 291 Limited | Real estate | 2025 |
| AG Construction & Refurbishment Ltd | Construction | 2023 |
| AG Estates Limited | Real estate | 2015 |
| AG Express Trade Ltd | Transport & logistics | 2016 |
| AG GAS & Heating Ltd | Construction | 2026 |