| Ace Ultimate Limited | Extraterritorial | 2012 |
| Aceaction Tech Limited | Wholesale & retail | 2024 |
| Acedly Ltd | Wholesale & retail | 2026 |
| ACH Clinic Limited | Health & social care | 2015 |
| ACH Grand Occasions Ltd | Hospitality | 2026 |
| Achiever Systeam Biochem Co., Ltd. | Extraterritorial | 2016 |
| ACI Industrial Holding Ltd | Manufacturing | 2012 |
| Acot Ltd | Manufacturing | 2026 |
| Acoustic Interiors Limited | Construction | 2013 |
| Acoustix Touring Services Ltd | Information & communication | 2025 |
| Acre & Oak Limited | Construction | 2025 |
| Acre Group Companies Limited | Real estate | 2025 |
| Acreage Limited | Real estate | 2023 |
| Acrylic Parts Co., Ltd | Manufacturing | 2017 |
| ACS Lofthouse Homes Ltd | Real estate | 2025 |
| ACT Mortgage Management Investments Ltd | Administrative & support | 2022 |
| ACT Mortgage Management Limited | Administrative & support | 2005 |
| Active Fire & Security Systems Limited | Professional & scientific | 2014 |
| Active Padel Ltd | Arts & recreation | 2023 |
| ACZ Plumbing & Leak Detection Specialists Ltd | Construction | 2024 |
| AD Lofts & Construction Ltd | Construction | 2021 |
| AD Social Bloom Ltd | Professional & scientific | 2025 |
| AD Software Consultants Limited | Information & communication | 2013 |
| ADA Trade Co., Ltd. | Professional & scientific | 2014 |
| Adad Energy Technology Co., Ltd | Manufacturing | 2021 |
| Adams Controls Limited | Extraterritorial | 2020 |
| Adare International Transport UK Ltd | Administrative & support | 2021 |
| ADC Innovations Ltd | Information & communication | 2019 |
| Adde Technology Co., Ltd | Extraterritorial | 2014 |
| Addedmile Ltd | Professional & scientific | 2024 |
| Adems Carpentry & Joinery Limited | Construction | 2017 |
| Aden Trading and Construction Limited | Construction | 2015 |
| Adeore Fashion Limited | Wholesale & retail | 2025 |
| ADI Sebastian Ciobanu Ltd | Transport & logistics | 2019 |
| ADM Lettings and Management Ltd | Households | 2025 |
| Adote Trading Co., Limited | Wholesale & retail | 2021 |
| ADP Diesel Group Co., Ltd | Wholesale & retail | 2025 |
| Adrien Raphoz Ltd | Professional & scientific | 2024 |
| Aduk Church | Other services | 2018 |
| Adusport International BVI Limited | Manufacturing | 2020 |
| Advance Innovation Solutions Ltd | Manufacturing | 2023 |
| Advanced Marine Technical Services Co., Ltd | Manufacturing | 2024 |
| Advanced Mining Industry Limited | Extraterritorial | 2012 |
| Advanceflow Limited | Extraterritorial | 2024 |
| Advancetech Consulting Ltd | Information & communication | 1999 |
| ADY22 Ltd | Construction | 2025 |
| AE Air Technology Ltd | Manufacturing | 2022 |
| Aechoo Technology Co. Ltd | Extraterritorial | 2015 |
| Aegean Decoration Co., Limited | Wholesale & retail | 2024 |
| Aends Limited | Wholesale & retail | 2022 |
| Aeolis Advisory Limited | Administrative & support | 2017 |
| Aerial Dynamic Tech Ltd | Manufacturing | 2020 |
| Aerides Limited | Information & communication | 2020 |
| Aeroe Global Corporation Ltd | Financial services | 2021 |
| Aerospace Aluminum Co., Ltd | Extraterritorial | 2013 |
| Aerospace Fastener Technologies (UK) Ltd | Wholesale & retail | 2013 |
| Aerweitasi (Finland) Group Chemical Industry Ltd | Extraterritorial | 2025 |
| AET International Tyre Group Co., Ltd | Professional & scientific | 2020 |
| Aetherwell Limited | Manufacturing | 2025 |
| Aetna GAS Co., Ltd. | Manufacturing | 2025 |
| AF Builders & Decorators Limited | Construction | 2022 |
| Afar Process Control Ltd | Extraterritorial | 2017 |
| Affilifest Ltd | Administrative & support | 2024 |
| Affinity (Overseas) Limited | Extraterritorial | 2006 |
| Afforde Doors Limited | Wholesale & retail | 2018 |
| AFG Autoparts Industrial Ltd | Extraterritorial | 2014 |
| AFL Technology Co., Limited | Extraterritorial | 2014 |
| Aflow Valve Co., Ltd | Extraterritorial | 2014 |
| Africa Farm Fresh Alliance Limited | Hospitality | 2024 |
| Africanized Limited | Other services | 2019 |
| Afters Beckenham Ltd | Hospitality | 2015 |
| Aftr Limited | Manufacturing | 2021 |
| AG Advisory Ltd | Professional & scientific | 2026 |
| AG Electrics Ltd | Construction | 2024 |
| AG Recruiting Ltd | Administrative & support | 2018 |
| Agbw - QS Limited | Professional & scientific | 2021 |
| Agce Global Limited | Wholesale & retail | 2024 |
| AGE Tech Support Ltd | Administrative & support | 2025 |
| Agent ONE51 Limited | Real estate | 2014 |
| Agile in Motion Limited | Professional & scientific | 2021 |
| Agile Stationery Ltd | Wholesale & retail | 2018 |
| Agmk Management Limited | Financial services | 2015 |
| AGO Retro Limited | Wholesale & retail | 2023 |
| Agora (Mediterranean) Limited | Hospitality | 2017 |
| Agra Beckenham Restaurant Ltd | Hospitality | 2025 |
| Agri International Trade Co., Ltd | Extraterritorial | 2021 |
| Agrohao Company Limited | Wholesale & retail | 2022 |
| Agrolook Company Limited | Professional & scientific | 2008 |
| Agrosource Company Ltd | Professional & scientific | 2014 |
| Agwa Trading Limited | Extraterritorial | 2023 |
| AGZ Trading Limited | Extraterritorial | 2024 |
| Aheadjust Limited | Extraterritorial | 2020 |
| Ahmespi International Ltd | Extraterritorial | 2020 |
| Ahra Holdings Limited | Financial services | 2022 |
| AI Content Marketing Limited | Administrative & support | 2023 |
| AI Correcto Ltd | Information & communication | 2026 |
| AI Legal Compliance Solutions Ltd | Information & communication | 2024 |
| Ai-Cha Food GB Limited | Manufacturing | 2025 |
| Aianna Limited | Wholesale & retail | 2021 |
| AIC Hydraulic & Pneumatic Co., Ltd | Extraterritorial | 2017 |