| AL Bayan AL Aslai Plastic Trading UK Ltd | Administrative & support | 2020 |
| Al-Nour Supermarket Ltd | Wholesale & retail | 2021 |
| Alabbas Original Ltd | Wholesale & retail | 2026 |
| Alan Rides Consultancy Ltd | Manufacturing | 2017 |
| Albanian-British Chamber of Commerce and Industry | Other services | 2004 |
| Albert Reci Investment Limited | Administrative & support | 2019 |
| Albion Business College Limited | Education | 2018 |
| Albion Connect Capital Limited | Wholesale & retail | 2014 |
| Albion Law Firm Limited | Professional & scientific | 2018 |
| Albion Power Capital Ltd | Wholesale & retail | 2016 |
| Albion Social Ltd | Hospitality | 2026 |
| Albis Consulting Ltd | Professional & scientific | 2020 |
| Alcateia Ltd | Administrative & support | 2018 |
| Alcopop! Records Limited | Information & communication | 2015 |
| Alderton Engineering Ltd | Professional & scientific | 2021 |
| Alex Heaton Limited | Administrative & support | 2020 |
| Alex Mucadum Limited | Information & communication | 2018 |
| Alexanders of Twickenham Limited | Wholesale & retail | 2002 |
| Alfie Plastering Ltd | Construction | 2025 |
| Algomerce Ltd | Wholesale & retail | 2020 |
| Alice Crespi Gardens Ltd | Administrative & support | 2018 |
| Aligned and Purposeful Ltd. | Education | 2018 |
| ALL Routes Transport Ltd | Transport & logistics | 2025 |
| ALL Your Idea Ltd | Professional & scientific | 2022 |
| Allegory Clinic Ltd | Health & social care | 2026 |
| Allevate Limited | Information & communication | 2007 |
| Allora JD Health Ltd | Information & communication | 2026 |
| Allure Blinds Ltd | Manufacturing | 2021 |
| Alma Bearings Limited | Wholesale & retail | 2022 |
| Alpha MUM Limited | Education | 2026 |
| Alphablox Services Limited | Health & social care | 2018 |
| Alphastartours Ltd | Education | 2016 |
| ALT Insert Ltd | Information & communication | 2025 |
| Altec Lansing Research and Development Corporation | | 1997 |
| Alter Therapy Ltd | Other services | 2022 |
| Alton Marketing Ltd | Professional & scientific | 2025 |
| Altrix Medispa Limited | Health & social care | 2025 |
| Alvc Ltd | Transport & logistics | 2020 |
| Alys&Martin Ltd | Information & communication | 2023 |
| AMA Film Limited | Information & communication | 2013 |
| Amaf Services Ltd | Transport & logistics | 2022 |
| Amafhh Dental Practices Limited | Health & social care | 2009 |
| Aman ENT Ltd | Wholesale & retail | 2025 |
| Amanda Duffy Communications Ltd | Professional & scientific | 2015 |
| Amanda Penny Ltd | Health & social care | 2017 |
| Amar Therapies Ltd | Health & social care | 2025 |
| Amatron Limited | Manufacturing | 2019 |
| Amavarahy Services Limited | Wholesale & retail | 2025 |
| Amazon Publishing Limited | Information & communication | 2009 |
| Amber Super Retail Ltd | Wholesale & retail | 2014 |
| Amberley Group Ltd | Manufacturing | 2012 |
| Amberley Nursery Limited | Education | 2003 |
| Ambient Electrics Limited | Construction | 2023 |
| Amblicious Cuisine Limited | Hospitality | 2025 |
| AMD Verma Holdings Limited | Real estate | 2025 |
| Amev Investments Ltd | Real estate | 2022 |
| Amezah Ltd | Information & communication | 2025 |
| AMG Financial Management Ltd | Financial services | 2009 |
| AMG Private Finance Ltd | Financial services | 2017 |
| Amgasservices Ltd | Construction | 2015 |
| Amic Group Ltd | Construction | 2015 |
| Amin Khan Design Ltd | Information & communication | 2014 |
| Amindieco Ltd | Real estate | 2022 |
| Amma Housing Limited | Real estate | 2024 |
| AMN Business Solutions Ltd | Professional & scientific | 2008 |
| Amnek Limited | Extraterritorial | 2011 |
| AMP Psychology Ltd | Health & social care | 2025 |
| AMP Space Ltd | Professional & scientific | 2020 |
| Amplitude Hearing Ltd | Health & social care | 2020 |
| AMV Business Centres Limited | Real estate | 2024 |
| AMY Lou's Godalming Ltd | Wholesale & retail | 2025 |
| Amyand Park Freehold Ltd. | Households | 2023 |
| Amyand Park Residents Association Limited | Households | 1976 |
| Amyand Park Road Residents Limited | Households | 1996 |
| Anacrusis Consulting Limited | Professional & scientific | 2009 |
| ANB Atelier Ltd | Wholesale & retail | 2025 |
| ANB Optimum Capital Ltd | Transport & logistics | 2021 |
| Ancient & Modern Ltd. | Professional & scientific | 2019 |
| Ancient Oak Properties Ltd | Real estate | 2025 |
| Anclamada Ltd | Administrative & support | 2017 |
| AND Wonder Ltd | Health & social care | 2026 |
| Andrew Cleminson Ltd | Extraterritorial | 2014 |
| Andrew Morrens Gardens Limited | Administrative & support | 2020 |
| Andy Monaghan Studio Ltd | Arts & recreation | 2026 |
| Angel & Dove Ltd | Wholesale & retail | 2016 |
| Angel KO Limited | Real estate | 2023 |
| Angelic Healthcare Provider Ltd | Health & social care | 2024 |
| Angels 5 Ltd | Information & communication | 2021 |
| Angrychow Limited | Professional & scientific | 2008 |
| Angus Ellis Building Services Limited | Construction | 2010 |
| Anika Food Services Ltd | Hospitality | 2024 |
| Animagic Limited | Administrative & support | 1991 |
| Animal Stories Ltd | Agriculture & fishing | 2025 |
| Anissa's 16 Cafe Ltd | Hospitality | 2024 |
| Anita Developers Ltd | Construction | 2018 |
| Anita Jackson Ltd | Professional & scientific | 2012 |
| Anna Hopkins Therapy and Training Limited | Health & social care | 2018 |
| Anonse Ltd | Information & communication | 2012 |
| Ant-Tcg Ltd | Wholesale & retail | 2026 |
| Antenai Ltd | Information & communication | 2025 |