| Amptech Electrical Services Limited | Construction | 2018 |
| AMR Resin and Flame Ltd | Manufacturing | 2025 |
| Amra Homes Limited | Health & social care | 2024 |
| Amra Medicare Limited | Health & social care | 2024 |
| Amraz Consulting Limited | Information & communication | 2025 |
| Amritsari Haveli Restaurant Ltd | Hospitality | 2025 |
| AMS (Kent) Ltd | Other services | 2024 |
| AMS - Ashford Machine Shop Ltd | Wholesale & retail | 2025 |
| AMY Barnes Interpreting Limited | Professional & scientific | 2024 |
| AMY Jolley Saddle Fitter Ltd | Wholesale & retail | 2026 |
| AMY Star Nails Ltd | Other services | 2024 |
| AMY Thomas Sports Therapy Ltd | Health & social care | 2020 |
| Anak Properties Ltd | Real estate | 2020 |
| Analysis Technics Ltd | Administrative & support | 2017 |
| Analytical Measurements Limited | Manufacturing | 1998 |
| Anan Ningjmin Ltd | Wholesale & retail | 2026 |
| Anandita Limited | Health & social care | 2013 |
| Anatolia 28 Ltd | Hospitality | 2023 |
| Anatolia TN23 Ltd | Hospitality | 2026 |
| Anchor Catering Limited | Hospitality | 1997 |
| Anchor Gentleman Grooming Ltd | Other services | 2023 |
| Anchor Property Investment Limited | Real estate | 2025 |
| Anchusa Property Ltd | Construction | 2024 |
| AND Ninthly... Limited | Construction | 2004 |
| AND Pause Ltd | Health & social care | 2026 |
| Anderson Hacking Limited | Real estate | 2014 |
| Andrew Ballheimer Consulting Limited | Other services | 2020 |
| Andrew Dampier Forensics Limited | Professional & scientific | 2025 |
| Andrew Davis, Child & Adolescent Psychotherapy Limited | Health & social care | 2023 |
| Andrew Mckenna Broadcasting Limited | Information & communication | 2021 |
| Andrew Mearing Wealth Management Limited | Professional & scientific | 2020 |
| Andromeda Associates Limited | Administrative & support | 2009 |
| Androv 1718 Limited | Construction | 2018 |
| Andy for Healthcare Limited | Health & social care | 2022 |
| Andy KAY Performance Ltd | Other services | 2026 |
| Andy Walker Engineering Limited | Construction | 2014 |
| Andy Warren Ltd | Information & communication | 2021 |
| Andy's Autobarn Limited | Manufacturing | 2015 |
| Anfl Limited | Wholesale & retail | 2019 |
| Angling Ambitions Limited | Wholesale & retail | 2002 |
| Anglo Amalgamations and Acquisitions Limited | Professional & scientific | 1989 |
| Anglo French Property Investments Limited | Real estate | 1999 |
| Anglo Polish Builders Limited | Construction | 2017 |
| Anglo Polish Properties Limited | Real estate | 2021 |
| Anglo-Link Languages Limited | Education | 2008 |
| Anglosinomix Ltd | Wholesale & retail | 2009 |
| Angmering Court Loft Apartments Ltd | Construction | 2023 |
| Angus Macdonald Films Ltd | Arts & recreation | 2015 |
| Anik Infotech Limited | Information & communication | 2022 |
| Animalog Ltd | Information & communication | 2020 |
| Anita Scarlett Designs Ltd | Other services | 2022 |
| Anivatio Pets Ltd | Wholesale & retail | 2025 |
| Ankobia Group Limited | Professional & scientific | 2020 |
| Anna Nails Ashford Ltd | Other services | 2024 |
| Annapurna Kitchen Ltd | Hospitality | 2020 |
| Anne Gift Foundation (UK) | Health & social care | 2020 |
| Annetta Aesthetics Ltd | Wholesale & retail | 2026 |
| Anning Financial Management Limited | Financial services | 2003 |
| Annings Motors Limited | Wholesale & retail | 2021 |
| Annly Capital Ltd | Professional & scientific | 2011 |
| Anoop R Limited | Health & social care | 2020 |
| ANP Security Limited | Administrative & support | 2015 |
| Anreka Limited | Professional & scientific | 2006 |
| Ansh Property Group Limited | Real estate | 2025 |
| ANT Warehousing and Logistics Limited | Transport & logistics | 2026 |
| Antares Brilliance Limited | Information & communication | 2023 |
| ANTARES21 Limited | Professional & scientific | 2008 |
| Antonio Rosa Ltd | Wholesale & retail | 2021 |
| Antopeto Ltd | Information & communication | 2025 |
| Anuhi-Ai Ltd | Information & communication | 2025 |
| Anuja (PVT) Limited | Wholesale & retail | 2018 |
| Anukarm Limited | Real estate | 2025 |
| Anvenssa Ltd | Professional & scientific | 2025 |
| Anwaar Cosmetics Limited | Other services | 2021 |
| Anything Grows Limited | Information & communication | 2013 |
| Anything That Scares YOU Ltd | Information & communication | 2025 |
| Anythingglass Ltd | Construction | 2023 |
| Anzel IMS Auditing Services Ltd | Professional & scientific | 2014 |
| Aontas Limited | Information & communication | 2022 |
| Aoqs Limited | Professional & scientific | 2025 |
| AP Financial Limited | Transport & logistics | 2018 |
| AP Lifting & Logistics Ltd | Construction | 2016 |
| AP Lynch Construction Limited | Construction | 2013 |
| APB Roofing Solutions Ltd | Construction | 2024 |
| Aperture Sight Ltd | Information & communication | 2016 |
| Apex Consulting & Project Management Services Limited | Construction | 2017 |
| Apex Eagle Limited | Professional & scientific | 2021 |
| Apex Facades Ltd | Construction | 2015 |
| Apex Ledger Industries Limited | Information & communication | 2021 |
| Aplus Coldrooms Ltd | Manufacturing | 2024 |
| Apocrita Ltd | Information & communication | 2009 |
| Apollo Funk Entertainments Ltd | Arts & recreation | 2026 |
| Apollo Joinery Limited | Manufacturing | 2007 |
| Apollo Surrey Limited | Professional & scientific | 2012 |
| Apostille Express Ltd | Public administration | 2023 |
| Apple Home Developments Ltd | Construction | 2024 |
| Appleberry Estates Ltd | Real estate | 2022 |
| Appledore SCM Consulting Ltd | Professional & scientific | 2024 |
| Applegate Court Management Company Limited | Households | 2015 |
| Applewood Design & Development Ltd | Real estate | 2023 |