| Anchor Road Tyres Ltd | Wholesale & retail | 2026 |
| Andhey Investments Ltd | Real estate | 2023 |
| Angel Tribe Fashion House Ltd | Manufacturing | 2025 |
| Anglo International Limited | Construction | 1994 |
| Anglo Management and Payment Services Limited | Construction | 2022 |
| Anne's Events Ltd | Hospitality | 2019 |
| Antara Investments Ltd | Real estate | 2019 |
| Antmar Creations Ltd | Construction | 2025 |
| Antmar Ltd | Transport & logistics | 2024 |
| Antony Jones Consultancy Services Ltd | Professional & scientific | 2015 |
| Anyora Limited | Wholesale & retail | 2026 |
| Anything IS Possible Solutions Ltd | Administrative & support | 2025 |
| AP Electrical Systems Ltd | Construction | 2025 |
| AP Property Assets Ltd | Real estate | 2024 |
| Apex Home Furnishings Ltd | Wholesale & retail | 2020 |
| Apex Marketing Solutions Ltd | Professional & scientific | 2025 |
| Apex Synergy Services Ltd | Transport & logistics | 2026 |
| Apex Vehicle Engineering Ltd | Wholesale & retail | 2026 |
| Apitel Limited | Manufacturing | 2011 |
| Apitel Plus Limited | Wholesale & retail | 2025 |
| Appledore Homes Limited | Real estate | 2002 |
| Applegreen Trading & Investments UK Ltd | Financial services | 2020 |
| Apteum Limited | Professional & scientific | 2022 |
| Aqua Force Holdings Limited | Professional & scientific | 2024 |
| Aqua VAC Ltd | Administrative & support | 2020 |
| Aquila Property Care Ltd | Administrative & support | 2024 |
| Arbaflorin Ltd | Transport & logistics | 2018 |
| ARK Embroidery Ltd | Wholesale & retail | 2021 |
| ARK Safaris BTS PVT Ltd | Administrative & support | 2024 |
| ARK Training Social Care Consultancy Ltd | Professional & scientific | 2024 |
| ARK Training Solutions Ltd | Public administration | 2026 |
| ARK UK Properties Ltd | Real estate | 2018 |
| Armani Sofa Ltd | Wholesale & retail | 2025 |
| Armourlite Ltd | Manufacturing | 2011 |
| Arnold the Tiler Ltd | Construction | 2024 |
| Arpan Real Estates Ltd | Real estate | 2020 |
| Arras Auto Repairs Ltd | Wholesale & retail | 2025 |
| Arriva Tech Ltd | Manufacturing | 2024 |
| Arrowsmith Commercials Ltd | Wholesale & retail | 2022 |
| Artbyzakia Ltd | Wholesale & retail | 2020 |
| Aryan Construction Limited | Administrative & support | 2026 |
| AS Transforce Ltd | Transport & logistics | 2025 |
| As-Safwah Foods Ltd | Wholesale & retail | 2018 |
| Asas Properties Ltd | Real estate | 2025 |
| ASC Transport Services Limited | Transport & logistics | 2026 |
| ASE - Sameday Courier Express Limited | Transport & logistics | 2013 |
| ASH Street Car Wash Ltd | Wholesale & retail | 2021 |
| ASH Transport Ltd | Transport & logistics | 2019 |
| Ashesi Ltd | Information & communication | 2021 |
| Ashik Chicken Kebabs (Distribution) Limited | Wholesale & retail | 2025 |
| Ashik Chicken Kebabs (Holdings) Limited | Financial services | 2020 |
| Ashik Chicken Kebabs (Processing) Limited | Manufacturing | 2025 |
| Ashik Chicken Kebabs (Spice) Limited | Manufacturing | 2025 |
| Ashkaw Ltd | Wholesale & retail | 2022 |
| Ashleywood Ltd | Other services | 2023 |
| Ashton Kotts International Ltd | Professional & scientific | 2024 |
| Asitservices Ltd | Information & communication | 2024 |
| Asla Music Records Ltd | Information & communication | 2025 |
| Aspire City Living Ltd | Real estate | 2019 |
| Aspire City Properties Ltd | Real estate | 2019 |
| Aspire Global Training & Recruitment Ltd | Education | 2025 |
| Aspreytech Limited | Information & communication | 2011 |
| Assemble My Flat Packs Ltd | Other services | 2025 |
| Assi Properties Limited | Real estate | 2025 |
| Assi Transport Ltd | Transport & logistics | 2025 |
| Association of British Muslims C.I.C. | Education | 2019 |
| AST Express Transport Ltd | Transport & logistics | 2025 |
| Aston Care Services Limited | Health & social care | 2023 |
| Astoria Advisory Limited | Other services | 2021 |
| Astoria Investments Limited | Real estate | 2026 |
| At&Tech Ltd | Manufacturing | 2016 |
| Atlas Refurb + Repair Limited | Other services | 2013 |
| Atlas Traders Limited | Wholesale & retail | 2017 |
| Atrium Care Facilities Ltd | Health & social care | 2020 |
| Audrey Glady Healthcare & Training Limited | Health & social care | 2016 |
| Aurelius Guild Limited | Health & social care | 2022 |
| Aureus Health Ltd | Health & social care | 2024 |
| Aurex Building Service Limited | Construction | 2026 |
| Auto Repair Services Limited | Wholesale & retail | 2001 |
| Autofinish Sprayworks Ltd | Wholesale & retail | 2026 |
| Automotivemasters Ltd | Wholesale & retail | 2025 |
| Autotrust Centre Limited | Wholesale & retail | 2011 |
| Avie Solutions Ltd | Information & communication | 2013 |
| Avitto Co. Limited | Construction | 2025 |
| AVT7 Ltd | Administrative & support | 2025 |
| Avtar Singh & Sons Ltd | Hospitality | 2024 |
| Avtm Ltd | Construction | 2019 |
| AY Transport Services Ltd | Transport & logistics | 2026 |
| AY Triple Glaze Ltd | Construction | 2026 |
| Azzizaimanlumi Limited | Professional & scientific | 2022 |
| B & K Property Group Ltd | Construction | 2026 |
| B C Barton International Limited | Manufacturing | 2013 |
| B Frame Productions Limited | Information & communication | 2026 |
| B R Haulage Ltd | Transport & logistics | 2025 |
| B-Gas Services Ltd | Construction | 2018 |
| Baaz Builders Ltd | Construction | 2023 |
| Baaz Courier Service Ltd | Transport & logistics | 2025 |
| Babaji Legal & Property Services Ltd | Real estate | 2021 |
| Babaji Property Services Limited | Households | 2026 |
| Baby Chettan Properties Limited | Real estate | 2025 |