| Adopt a Grandparent Limited | Health & social care | 2020 |
| Adorian Limited | Real estate | 2018 |
| Adrastone Limited | Professional & scientific | 2023 |
| Advanced Joint Network & Automation Systems Ltd. | Manufacturing | 2017 |
| Advx Ltd | Professional & scientific | 2024 |
| AER Ventures Ltd | Professional & scientific | 2014 |
| Aerobox SC Limited | Construction | 2025 |
| Aerodyne Aerospace Holdings Ltd. | Manufacturing | 2019 |
| Aerodyne Innovation, Research and Advanced Development Ltd | Manufacturing | 2024 |
| Aeron Branding Limited | Administrative & support | 2014 |
| Affinity Landscapes Limited | Administrative & support | 2003 |
| Affinity Property Maintenance Ltd | Administrative & support | 2016 |
| AGE Concern Haslemere and District Ltd | Extraterritorial | 2017 |
| AGE Concern Surrey (Trading) Limited | Extraterritorial | 2016 |
| AGE Concern Surrey Limited | Extraterritorial | 2016 |
| AGE UK Runnymede and Spelthorne | Extraterritorial | 2008 |
| AGE UK Surrey | Health & social care | 1993 |
| AGE UK Surrey (Trading) Limited | Extraterritorial | 2001 |
| Agile Cost Management Ltd | Professional & scientific | 2021 |
| Agua VIA Limited | Professional & scientific | 2007 |
| AH Escapes Limited | Administrative & support | 2024 |
| Ahammerbbq Limited | Arts & recreation | 2013 |
| Ahul Trading Limited | Wholesale & retail | 2025 |
| AI Cosmos Studios Ltd | Information & communication | 2023 |
| AI Edtech Holdings Limited | Administrative & support | 2025 |
| AI Evolution Limited | Administrative & support | 2016 |
| AIC Renovations Ltd | Construction | 2025 |
| Ailera Ltd | Wholesale & retail | 2011 |
| Air Bricks Limited | Real estate | 2014 |
| Air Transportation Analytics Limited | Professional & scientific | 2018 |
| Air Works UK Limited | Energy | 2002 |
| Airberry Ltd | Transport & logistics | 2020 |
| Airwiggles Ltd | Education | 2025 |
| AJB Clothing and Storage Limited | Wholesale & retail | 2007 |
| Ajbell Advisory Limited | Professional & scientific | 2019 |
| Ajsb Aviation Ltd | Administrative & support | 2015 |
| Akeydor Limited | Information & communication | 2012 |
| AKS Groundwork Limited | Construction | 2022 |
| AKS Structures Limited | Professional & scientific | 2017 |
| Akusoft Ltd | Information & communication | 2018 |
| Akwa Consulting Limited | Professional & scientific | 2021 |
| Alan Bishop Themeworks Limited | Professional & scientific | 1998 |
| Albatross Entertainments Limited | Arts & recreation | 2017 |
| Albion Gate Automation Ltd | Construction | 2022 |
| Alca Group Ltd | Financial services | 2024 |
| Alco Construction Ltd | Construction | 2012 |
| Alco Decorating Ltd | Construction | 2024 |
| Alco Development Ltd | Construction | 2024 |
| Alco Group (South East) Ltd | Professional & scientific | 2025 |
| Alco Roofing South East Ltd | Construction | 2024 |
| Aldro Enterprises Limited | Wholesale & retail | 1990 |
| Aldro School Educational Trust Limited | Education | 1968 |
| Aleks&Daria Transport Ltd | Transport & logistics | 2025 |
| Alexander Gardening Services Ltd | Administrative & support | 2023 |
| Alexander Project Services Ltd | Construction | 2025 |
| Alexir Brands Limited | Administrative & support | 2002 |
| Alexir Co-Packers Limited | Administrative & support | 1997 |
| Alexir Investments Limited | Real estate | 2010 |
| Alexir Packaging Limited | Manufacturing | 1989 |
| Alibrate Limited | Wholesale & retail | 2013 |
| Alison Whitehorn Consultancy Ltd | Professional & scientific | 2021 |
| ALL Energy Consulting Limited | Professional & scientific | 2012 |
| ALL Seasons Apartments Ltd | Hospitality | 2013 |
| Allegra Care (Holdings) Limited | Health & social care | 2018 |
| Allegra Care Somerset Limited | Health & social care | 2019 |
| Allegra Care South Limited | Health & social care | 2019 |
| Allegra Fairmile Grange Limited | Health & social care | 2024 |
| Allegra Services Limited | Health & social care | 2018 |
| Allen & Allen Holdings Limited | Financial services | 2019 |
| Allison Property Rental Limited | Real estate | 2023 |
| Alloneword Limited | Administrative & support | 2003 |
| Allonmobile Limited | Information & communication | 1999 |
| Allsopp Solutions Limited | Financial services | 2023 |
| Almada Properties Ltd | Real estate | 2024 |
| Almecs Ltd | Other services | 2026 |
| Alpha Leonis Trading Limited | Information & communication | 2023 |
| Alpha-Agro (International) Ltd | Extraterritorial | 2001 |
| Altemby Limited | Real estate | 1997 |
| Alvin AV Ltd | Construction | 2023 |
| Always Jazzy Ltd | Wholesale & retail | 2024 |
| Amatyne Ltd | Construction | 2022 |
| Amber April Limited | Financial services | 2026 |
| Ambleside (Godalming) Limited | Real estate | 1989 |
| Amdg Kairos Ltd | Professional & scientific | 2019 |
| AMG Imas Limited | Financial services | 2011 |
| AMH Developments Ltd | Construction | 2011 |
| AML Carpentry & Construction Ltd. | Construction | 2008 |
| AMP Sound and Hire Limited | Arts & recreation | 2016 |
| Amped Electrical Contractors Ltd | Construction | 2020 |
| AMS (Hampshire) Limited | Manufacturing | 2015 |
| AMS Marlow Ltd | Real estate | 2014 |
| AMY Westwood Ltd | Other services | 2013 |
| Anarcho Productions Ltd | Arts & recreation | 2022 |
| Andre Evans and J Chapman Professional Education Limited | Education | 2015 |
| Anella Style Limited | Extraterritorial | 2023 |
| Anila Air Service Holdings Ltd. | Manufacturing | 2018 |
| Animal Magic Academy Limited | Education | 2022 |
| Animal Magic Groomers Limited | Wholesale & retail | 2021 |
| Animi Associates Limited | Professional & scientific | 1998 |
| Anitime Ltd | Information & communication | 2026 |