| Alaturka Herne Bay LYD Ltd | Administrative & support | 2016 |
| Alban Catering Ltd | Hospitality | 2020 |
| Albany Capital Limited | Construction | 1974 |
| Albany Growth Limited | Administrative & support | 2021 |
| Albany Interim Limited | Administrative & support | 2023 |
| Albany Partners Limited | Administrative & support | 2012 |
| Alben Enterprises Ltd | Wholesale & retail | 2024 |
| Albira London Ltd | Wholesale & retail | 2025 |
| Alchemy Medical Communications Limited | Professional & scientific | 2015 |
| Alco Project & Construction Management Limited | Professional & scientific | 2025 |
| Alcroft Medical Services LLP | | 2014 |
| Alewife and Brewster Ltd | Manufacturing | 2016 |
| Alex Duddy Limited | Other services | 2023 |
| Alex Trans Services Ltd | Manufacturing | 2023 |
| Alexander Framing Limited | Wholesale & retail | 2008 |
| ALF Manston Limited | Construction | 2020 |
| Alfa Rocks Ltd | Wholesale & retail | 2025 |
| Algaecytes CPM Limited | Professional & scientific | 2017 |
| Algaecytes Limited | Professional & scientific | 2010 |
| ALI Jaan Ltd | Real estate | 2022 |
| ALI Wasim Properties Limited | Real estate | 2025 |
| ALI Whelan Ltd | Administrative & support | 2020 |
| Alice Made This Ltd | Manufacturing | 2010 |
| Alified Limited | Wholesale & retail | 2025 |
| Aligning Fitness Ltd | Health & social care | 2018 |
| Alignment Media Ltd | Professional & scientific | 2023 |
| Alimstone Limited | Real estate | 1999 |
| Alisha Barbers Ltd | Other services | 2023 |
| Alix Cordell Ltd | Health & social care | 2007 |
| ALL Able Ltd | Professional & scientific | 2019 |
| ALL Diaspora Network Ltd | Administrative & support | 2026 |
| ALL Greens Holdings Limited | Financial services | 2020 |
| ALL Greens London Limited | Financial services | 2014 |
| ALL Greens Wholesale Limited | Wholesale & retail | 2016 |
| ALL Health Matters Limited | Health & social care | 2010 |
| ALL Health Matters Trustee Limited | Extraterritorial | 2021 |
| ALL NET International Limited | Information & communication | 2020 |
| ALL Risks Kent-Sussex Asbestos Removals Ltd. | Water & waste | 2019 |
| ALL Sorts of Sweets Canterbury Limited | Wholesale & retail | 2026 |
| ALL Star Entertainment (ASE) Ltd | Administrative & support | 2025 |
| All-In Vac’S Ltd | Construction | 2024 |
| All-In-One Cleaning Ltd | Administrative & support | 2024 |
| Allenco Windows Ltd | Construction | 2024 |
| Allington Home Improvements Limited | Construction | 1999 |
| Allmulti Build Ltd | Construction | 2015 |
| Allprime Trading Ltd | Wholesale & retail | 2024 |
| Allstream Ltd | Information & communication | 2023 |
| Alltrippers Ltd | Information & communication | 2019 |
| Allun Lewis Ltd | Real estate | 2026 |
| Almendra Consultants Ltd | Professional & scientific | 2019 |
| Alna Limited | Health & social care | 2023 |
| Alph Projects Limited | Construction | 2026 |
| Alpha Taxis Canterbury Ltd | Transport & logistics | 2024 |
| ALTB2B Limited | Professional & scientific | 2017 |
| Altgen Recruitment Limited | Administrative & support | 2022 |
| Aluglaze Systems Limited | Construction | 2015 |
| Alya Property Limited | Real estate | 2025 |
| Alzeytoun Ltd | Wholesale & retail | 2024 |
| AM Geos Limited | Professional & scientific | 2015 |
| AM Industrial Limited | Construction | 1999 |
| AM Mobiles Zone Ltd | Other services | 2021 |
| AM Physiotherapy Ltd | Other services | 2021 |
| AM Physiotherapy Services Ltd | Health & social care | 2026 |
| Amabella Aesthetics Ltd | Other services | 2026 |
| Amabella Beauty Academy HQ Ltd | Other services | 2026 |
| Amacsports Limited | Education | 2003 |
| Amah Limited | Health & social care | 2012 |
| Amai Group Limited | Financial services | 2025 |
| Amaki Agency Limited | Health & social care | 2022 |
| Amande Concerts Limited | Arts & recreation | 2011 |
| Amaoh 1417 Ltd | Real estate | 2024 |
| Amarcode Studios Limited | Information & communication | 2024 |
| Amaze Appliances International (Cogb) Ltd | Wholesale & retail | 2018 |
| Amazella Limited | Hospitality | 2019 |
| AMB Transport Services Limited | Transport & logistics | 2019 |
| Amb-Kelso Limited | Administrative & support | 2020 |
| Ambassador Enterprise (Kent) Limited | Real estate | 2016 |
| Amber ARC Limited | Administrative & support | 2013 |
| Amber Holdings (Canterbury) Ltd | Households | 2024 |
| Ambrosini & Co Architecture & Design Ltd | Professional & scientific | 2026 |
| Amegan Interiors Ltd | Construction | 2026 |
| Amethyst ARC Ltd | Administrative & support | 2012 |
| AMG Consultants Limited | Administrative & support | 2012 |
| Amin Kent Limited | Wholesale & retail | 2023 |
| Amin Lettings Ltd | Real estate | 2020 |
| Amin Services Ltd | Health & social care | 2015 |
| Amoshr Ltd | Professional & scientific | 2023 |
| AMP Holdings Limited | Financial services | 2021 |
| Ampl Loans Ltd | Financial services | 2026 |
| AMPLIFY5 Ltd | Administrative & support | 2020 |
| AMS Catering Limited | Hospitality | 2014 |
| Amyrosiefit Limited | Arts & recreation | 2026 |
| Amyty Ltd | Real estate | 2018 |
| Amyty Trading Ltd | Real estate | 2018 |
| Anaestheasier Ltd | Education | 2022 |
| Ancient World Tours Limited | Administrative & support | 1997 |
| Ancla Limited | Real estate | 2007 |
| Andok Kebab Ltd | Hospitality | 2019 |
| Andrew Buchanan Design Associates Limited | Professional & scientific | 2025 |
| Andrew Dowell Consultancy Ltd | Professional & scientific | 2024 |