| Ahoo & AVA Ltd | Extraterritorial | 2022 |
| Ahuja’S Phone Gallery Ltd | Wholesale & retail | 2020 |
| AI Genius PVT Ltd | Wholesale & retail | 2025 |
| Aiborn Solutions Ltd | Professional & scientific | 2024 |
| Aide Data Limited | Information & communication | 2018 |
| Aidexcel Support Services Limited | Other services | 2009 |
| Ailux Limited | Information & communication | 2026 |
| AIM4ALL (Services) Limited | Professional & scientific | 2023 |
| Aimc Solutions Ltd. | Manufacturing | 2016 |
| Aimil Limited | Wholesale & retail | 2021 |
| Aion Ltd. | Administrative & support | 2017 |
| Aion Properties Limited | Real estate | 2025 |
| Aipex OPS CIC | Water & waste | 2024 |
| Air Conditioning Projects Limited | Energy | 2008 |
| Aircare Brands Limited | Manufacturing | 2014 |
| Aircraft Experts Limited | Other services | 2024 |
| Aircurtain Design Limited | Manufacturing | 2004 |
| Airedale NO1 Ltd | Health & social care | 2021 |
| Airlease Limited | Real estate | 2023 |
| Airplane Holidays Ltd | Administrative & support | 2017 |
| Aisa Medical Ltd | Health & social care | 2009 |
| Aishell Ltd | Hospitality | 2023 |
| Aiston Surveyors Ltd | Professional & scientific | 2005 |
| Aitzah Limited | Education | 2005 |
| AIW Estate Agents Ltd | Real estate | 2020 |
| AJ Fire Risk Consultants Limited | Professional & scientific | 2024 |
| AJ Partition Interiors Ltd | Construction | 2022 |
| AJ TAU Limited | Wholesale & retail | 2024 |
| Ajand Limited | Information & communication | 2009 |
| AJB Plumbing & Building Ltd | Construction | 2024 |
| AJI DEL Mono UK Limited | Hospitality | 2010 |
| AJI Medical Services Limited | Health & social care | 2011 |
| Ajila MBK Ltd | Wholesale & retail | 2025 |
| AK & Co Consultants Ltd | Professional & scientific | 2015 |
| AK Nails and Beauty Limited | Other services | 2021 |
| AK Signature Cuts Limited | Other services | 2026 |
| AKA Dental Ltd | Health & social care | 2022 |
| AKA Removals Ltd | Transport & logistics | 2026 |
| Aka&T Limited | Administrative & support | 2015 |
| Akahana Management Limited | Hospitality | 2013 |
| Akal-Med Fizjoterapia Ltd | Health & social care | 2020 |
| Akal-Med Ltd | Administrative & support | 2019 |
| Akanni Inc Ltd. | Professional & scientific | 2016 |
| Akasha Developments Ltd | Real estate | 2026 |
| Akatemia Community Interest Company | Education | 2011 |
| AKG Agriculture Ltd | Agriculture & fishing | 2022 |
| Akiner Ltd | Wholesale & retail | 2024 |
| Akman Trading Ltd | Wholesale & retail | 2019 |
| Akmc Holdings Ltd | Financial services | 2023 |
| Akmi Limited | Construction | 1997 |
| Akosluxe Limited | Health & social care | 2023 |
| Akraberg LP | | 2012 |
| Akronymion Productions Ltd | Extraterritorial | 2014 |
| Akrs Capital Partners Ltd | Administrative & support | 2023 |
| AKS Studios Ltd | Professional & scientific | 2024 |
| Aksai Ltd | Real estate | 2021 |
| Akshay Supplies Ltd | Wholesale & retail | 2023 |
| AKT Consulting Limited | Professional & scientific | 2019 |
| AKU Investments Limited | Real estate | 2024 |
| AKZ Residential Ltd. | Real estate | 2019 |
| Akzc Holdings Ltd | Financial services | 2023 |
| AL Whouhayb Ltd | Health & social care | 2018 |
| Alab Ltd | Professional & scientific | 2014 |
| Aladin Services Ltd | Construction | 2013 |
| Alahera Ltd | Manufacturing | 2023 |
| Alambert Consultants Limited | Administrative & support | 2016 |
| Alan Anderson Manufacturing Ltd | Manufacturing | 2021 |
| Alan Brown Builders Limited | Construction | 2002 |
| Alan COX Associates Limited | Professional & scientific | 2008 |
| Alan Gibbons Associates Limited | Professional & scientific | 2011 |
| Alans Group UK Ltd | Hospitality | 2018 |
| Alaris Properties Limited | Construction | 2020 |
| Alasrawi Ltd | Wholesale & retail | 2024 |
| ALB Facades Ltd | Construction | 2022 |
| ALB Hardwood Flooring Ltd | Construction | 2022 |
| Alban Building Ltd | Construction | 2023 |
| Alban PRE School Limited | Education | 2020 |
| Albb Properties Limited | Real estate | 2021 |
| Albeego Limited | Information & communication | 2018 |
| Albert Land Investments Ltd | Real estate | 2025 |
| Albert Street Consulting Ltd | Professional & scientific | 2022 |
| Albert Street Ltd | Professional & scientific | 2018 |
| Albjani Holdings Ltd | Financial services | 2025 |
| Albmir Construction Ltd | Construction | 2019 |
| Albrecht Jung UK Limited | Wholesale & retail | 2018 |
| Albrey Properties Limited | Hospitality | 1960 |
| Albury Constructions Ltd | Construction | 2016 |
| ALC Overseas Ltd | Wholesale & retail | 2021 |
| Alcera Group Ltd | Professional & scientific | 2021 |
| Aldermans Property Group Ltd | Construction | 2025 |
| Alderwood (Hadley) Limited | Real estate | 2001 |
| Aldf Services Limited | Professional & scientific | 2014 |
| Aldridge Road Villas NO 32 Limited | Households | 2006 |
| Aleeza Rosenberg Limited | Health & social care | 2023 |
| Aleksvediani Ltd | Arts & recreation | 2026 |
| Ales Investments Limited | Real estate | 2005 |
| Alesandra Macsim Ltd | Other services | 2026 |
| Aleti IT Solutions Ltd | Information & communication | 2024 |
| Alex & Co. Property Care Ltd | Construction | 2025 |
| Alex Build 4U Ltd | Construction | 2024 |