| AK Car Sales Ltd | Wholesale & retail | 2015 |
| AK Digital Limited | Professional & scientific | 2021 |
| AK Property Matters Ltd | Real estate | 2024 |
| AK Security Services Ltd | Administrative & support | 2015 |
| AKA Housing Solutions Limited | Real estate | 2023 |
| Akai UK Ltd | Wholesale & retail | 2004 |
| Akap Energy Ltd | Professional & scientific | 2018 |
| AKB Properties Limited | Real estate | 2017 |
| Akimbo BIO Ltd | Professional & scientific | 2025 |
| Akpk Ltd | Construction | 2025 |
| AKR Collective Ltd | Real estate | 2025 |
| Akrn Panna Ltd | Wholesale & retail | 2024 |
| Akrox Properties Limited | Real estate | 2025 |
| AKS Care Ltd | Health & social care | 2024 |
| AKS Harrow Limited | Other services | 2019 |
| Akshaj Commodities Ltd | Wholesale & retail | 2015 |
| Akshar and Jaik Ltd | Real estate | 2023 |
| Akshar Electric Ltd | Manufacturing | 2025 |
| Akshar Electrical Limited | Construction | 2019 |
| Akshar NI Drashti Limited | Real estate | 2019 |
| Akshara Group Limited | Wholesale & retail | 2015 |
| AKY Education Ltd | Education | 2023 |
| AL Basrah Ltd | Professional & scientific | 2025 |
| AL Hadi Holdings Limited | Real estate | 2024 |
| AL Hujjat Travel Limited | Extraterritorial | 2019 |
| Al-Rashed Consultancy Ltd | Professional & scientific | 2024 |
| Alain EYE Care Limited | Health & social care | 2019 |
| Alan Tracy Limited | Other services | 2006 |
| Alans TEK Ltd | Administrative & support | 2014 |
| Albany Court Freehold Limited | Households | 2000 |
| Alboom London Ltd | Administrative & support | 2025 |
| Albostan Ltd | Transport & logistics | 2022 |
| Alchventures Limited | Administrative & support | 2012 |
| Alden Fittings Limited | Public administration | 2001 |
| Aldgate Warehouse International Investment Ltd | Real estate | 2020 |
| Alex Donici Ltd | Construction | 2014 |
| Alex Motor Transport Limited | Transport & logistics | 2020 |
| Alexander Jules Limited | Manufacturing | 2020 |
| Alfa International Limited | Real estate | 2019 |
| Alfaris Ltd | Agriculture & fishing | 2020 |
| Alfi Media Limited | Information & communication | 2007 |
| Alfie Caine Limited | Arts & recreation | 2021 |
| ALI Trading UK Ltd | Other services | 2012 |
| Alia RAJ Kitchens Limited | Hospitality | 2025 |
| Align Fencing Limited | Construction | 2022 |
| Aligner Accessories Ltd | Wholesale & retail | 2026 |
| Alignlinq Ltd | Professional & scientific | 2025 |
| Alirezadential Ltd | Real estate | 2020 |
| Alison Young Limited | Information & communication | 2010 |
| Aliu Cleaning Services Ltd | Administrative & support | 2023 |
| Aliwa Holdings Limited | Other services | 2023 |
| Aliya & Hasan's Bookshelf Ltd | Wholesale & retail | 2025 |
| Aliya Enterprises Limited | Administrative & support | 2003 |
| ALL 3 Limited | Construction | 2008 |
| ALL Golf Services Ltd | Construction | 2022 |
| ALL Nine Lines Ltd | Professional & scientific | 2023 |
| ALL Property Online Property Services Limited | Administrative & support | 2018 |
| ALL Star Europe Limited | Wholesale & retail | 2007 |
| ALL YOU Need Essentials Ltd | Wholesale & retail | 2025 |
| Allcotes Decorating Services Ltd | Construction | 2025 |
| Allen's Design & Print Ltd | Manufacturing | 2011 |
| Allen's Taxis Limited | Transport & logistics | 2003 |
| Allied Medical Consultants Ltd | Health & social care | 2014 |
| Allitsen Investments Limited | Real estate | 2016 |
| Allmetals Trading Ltd | Wholesale & retail | 2018 |
| Alluvial Plains Ltd | Information & communication | 2023 |
| Almar Joinery & Build Ltd | Construction | 2025 |
| Almo Properties Limited | Real estate | 2025 |
| Aloha Properties Ltd | Real estate | 2020 |
| Alpa END Ltd | Wholesale & retail | 2025 |
| Alpha Beta Management Limited | Information & communication | 2001 |
| Alpha Court (UK) Limited | Real estate | 2016 |
| Alpha Epsilon Ltd | Professional & scientific | 2008 |
| Alpha Global Builders Ltd | Construction | 2025 |
| Alpha Ministries Ltd | Manufacturing | 2024 |
| ALPHA3 Pro Ltd | Real estate | 2023 |
| Alpine Trading Limited | Administrative & support | 2017 |
| Alpl Design Ltd | Professional & scientific | 2025 |
| Alps Automotive Consultancy Ltd | Professional & scientific | 2016 |
| ALT Circle Health Limited | Manufacturing | 2022 |
| Altha Hire Ltd | Transport & logistics | 2022 |
| Altpar Ltd | Wholesale & retail | 2025 |
| Altvisory Limited | Professional & scientific | 2021 |
| Alvion Limited | Wholesale & retail | 2025 |
| Alvor Limited | Wholesale & retail | 1981 |
| Always Leather Limited | Wholesale & retail | 2009 |
| Alxx Trans Serv Ltd | Wholesale & retail | 2024 |
| Alzamel Group Holdings Limited | Financial services | 2025 |
| Alzamel Group UK Ltd | Financial services | 2020 |
| Alzamel Logistics Limited | Transport & logistics | 2023 |
| Alzamel Properties Limited | Real estate | 2025 |
| Alzara Couture Ltd | Wholesale & retail | 2026 |
| Alzy Properties Limited | Real estate | 2021 |
| Amaal Accessories Ltd | Wholesale & retail | 2025 |
| Amal Relocations Ltd | Hospitality | 2024 |
| Amalee Limited | Real estate | 2014 |
| Amanako Properties Limited | Real estate | 2003 |
| Amanda Beckman Associates Ltd | Arts & recreation | 2011 |
| Amanda White Design Ltd | Administrative & support | 2015 |
| Amanihom Limited | Wholesale & retail | 2022 |