| African Growth Ltd | Professional & scientific | 2023 |
| AG London Services Ltd | Transport & logistics | 2018 |
| AGNI27A Limited | Real estate | 2023 |
| Agsh&Ashmi Ltd | Wholesale & retail | 2018 |
| AJ Wines Ltd | Wholesale & retail | 2025 |
| AJC Trading Plus Limited | Wholesale & retail | 2025 |
| Ajehi Ltd | Health & social care | 2025 |
| AJS Construction Group Ltd | Construction | 2020 |
| AKK13 Limited | Transport & logistics | 2025 |
| Aldan Solutions Limited | Professional & scientific | 2006 |
| Alexander James Storage Ltd | Transport & logistics | 2016 |
| ALI Family Property Empire Ltd | Real estate | 2026 |
| Alikan Ltd | Real estate | 2026 |
| ALL Category Training Limited | Education | 2017 |
| ALL Ears Hearing Centre Ltd | Wholesale & retail | 2006 |
| ALL Fired UP Ltd | Construction | 2025 |
| Alliance Remedial Supplies Limited | Wholesale & retail | 2011 |
| Allspark Home Improvements Ltd | Construction | 2022 |
| Alltel Services Limited | Administrative & support | 2017 |
| Allthingsequallove Ltd | Wholesale & retail | 2016 |
| Alpha Capital Investments Limited | Real estate | 2015 |
| Alpii Barbers Limited | Other services | 2026 |
| ALR Group Ltd | Real estate | 2020 |
| Alumdisplay Ltd | Wholesale & retail | 2014 |
| Alver Cars Limited | Transport & logistics | 2011 |
| Alver Contracts Limited | Construction | 1990 |
| Alver Mobile Valeting Ltd | Administrative & support | 2022 |
| Alver Mortgage Solutions Ltd | Financial services | 2020 |
| Alverbridge Nursery | Education | 2009 |
| Alverstoke Aesthetics Limited | Other services | 2026 |
| Alverstoke Chiropractic Limited | Health & social care | 2017 |
| Alverstoke Dental Spa Ltd | Health & social care | 2025 |
| Alverstoke Ltd | Real estate | 2023 |
| Alverstoke Property Investments Limited | Real estate | 2013 |
| Alverstoke Spice Limited | Hospitality | 2025 |
| Alverstoke Village Fish Bar Limited | Wholesale & retail | 2002 |
| Always Caring Limited | Health & social care | 2024 |
| AMED2121 Ltd | Other services | 2024 |
| AMG the Garage Ltd | Wholesale & retail | 2012 |
| Amity Media Productions Ltd | Information & communication | 1996 |
| AMO Healthcare Services Limited | Health & social care | 2024 |
| AMP Investment Management Ltd | Extraterritorial | 2013 |
| AMR Bodyshop Ltd | Wholesale & retail | 2020 |
| AMR Bodywork Ltd | Wholesale & retail | 2025 |
| Amtec Integrated Solutions Limited | Administrative & support | 2015 |
| ANB Heating and Decorating Ltd | Construction | 2017 |
| AND SO the Story Goes Ltd | Professional & scientific | 2022 |
| Anderson & SON (Plastering) Ltd | Construction | 2024 |
| Andy Williams SEO Ltd | Professional & scientific | 2015 |
| Aneben Health Ltd | Administrative & support | 2024 |
| Anesco (Euro) Limited | Construction | 1996 |
| Angling Mentors CIC | Education | 2025 |
| Anna Marrufo Mortgages Limited | Financial services | 2017 |
| Annelies James Ltd | Administrative & support | 2025 |
| Annie Manly & Co Limited | Professional & scientific | 2017 |
| ANR Retail & Entertainment Limited | Arts & recreation | 2025 |
| ANY Lock UP Limited | Real estate | 2019 |
| Anya Bridal Couture Ltd | Wholesale & retail | 2011 |
| Anya Property Limited | Real estate | 2020 |
| Anya Waugh Ltd | Construction | 2025 |
| Anything Random YOU Need Ltd | Wholesale & retail | 2020 |
| Anytime Airports Ltd | Transport & logistics | 2026 |
| AP SD Four Limited | Wholesale & retail | 2025 |
| AP Stores Limited | Wholesale & retail | 2024 |
| APD Logistics Limited | Transport & logistics | 2012 |
| Apex Jewellery Repairs Limited | Other services | 2019 |
| Apex Marine Services Limited | Manufacturing | 2021 |
| APJ Pack Systems Ltd | Wholesale & retail | 2026 |
| APJ Property Holdings (UK) Ltd | Real estate | 2026 |
| Appleseed Arts | Arts & recreation | 2016 |
| APR Renovations Ltd | Construction | 2025 |
| Aqua Cleaning Services Limited | Administrative & support | 2012 |
| Aquatic Holdings Limited | Transport & logistics | 2025 |
| Aquatic Towage & Marine Ltd | Transport & logistics | 2022 |
| Aquatic Warrior Limited | Transport & logistics | 2025 |
| Aquaworld Bathrooms Limited | Wholesale & retail | 2003 |
| AR Building and Property Maintenance Ltd | Construction | 2026 |
| Arch Brickwork Ltd | Construction | 2016 |
| Arden Contracting Services Limited | Construction | 2003 |
| Ardent GAS Engineering Ltd | Administrative & support | 2019 |
| ARH Air Conditioning Limited | Construction | 2015 |
| Ariki Limited | Wholesale & retail | 2018 |
| Armasure Limited | Other services | 2014 |
| Armfield Agricultural Engineering Company Ltd | Construction | 2021 |
| Artcool Ltd | Manufacturing | 2002 |
| Arthur Peach Builders Limited | Real estate | 2016 |
| Arya ASO Barbers Ltd | Other services | 2023 |
| Ascend Guardianship and Education Support Ltd | Education | 2025 |
| Assess & Progress Limited | Professional & scientific | 2012 |
| Asset Maintenance Consultancy Ltd | Professional & scientific | 2019 |
| ASW Property Lets Ltd | Real estate | 2026 |
| ATC Fibre Solutions Ltd | Construction | 2021 |
| ATH Developments Ltd | Professional & scientific | 2013 |
| Atkins & Garrie Glazing Ltd | Construction | 2015 |
| Atkinson Pearson Electrical Ltd | Construction | 2006 |
| Atlantic Canvas Limited | Manufacturing | 2020 |
| Atomic Angel Ltd | Wholesale & retail | 2023 |
| ATP Technical Services Ltd | Real estate | 2012 |
| Attrill Property Ltd | Real estate | 2025 |
| Auctions @ Number One Limited | Wholesale & retail | 2023 |