| Agency Dynamics Ltd | Professional & scientific | 2025 |
| Agendas Group Limited | Financial services | 2020 |
| Agentigo LLP | | 2026 |
| AGF Fencing & Carpentry Ltd | Construction | 2021 |
| Agility Finance & Strategy Ltd | Professional & scientific | 2020 |
| Agitate Digital Limited | Information & communication | 2021 |
| Aglr Investments Ltd | Real estate | 2023 |
| AGN Solutions Limited | Professional & scientific | 2022 |
| Agricultural Group Ltd | Financial services | 2020 |
| Agricultural Mortgage Finance Limited Partnership | | 2018 |
| Agripartners Funding Limited | Financial services | 2020 |
| Agritech-Uk Ltd | Agriculture & fishing | 2020 |
| AGT Accountancy Ltd | Professional & scientific | 2023 |
| AGT Temel Limited | Hospitality | 2016 |
| Agusta Productions Limited | Information & communication | 2023 |
| Agycare Ltd | Other services | 2019 |
| AHC Transport Ltd | Transport & logistics | 2019 |
| Ahearn Trading Ltd | Other services | 2025 |
| AHH Development Management Limited | Construction | 2024 |
| AHH Pincents Limited | Construction | 2024 |
| AHH SET Ltd | Financial services | 2022 |
| Ahitopia Books Limited | Wholesale & retail | 2025 |
| AHN Nails Ltd | Other services | 2026 |
| AHR Holiday Lettings Ltd | Real estate | 2026 |
| Ahujaa Transport Ltd | Transport & logistics | 2026 |
| AI and More Limited | Information & communication | 2025 |
| AI Normal Ltd | Wholesale & retail | 2025 |
| AI Resource Group Ltd | Administrative & support | 2018 |
| Ai-Tor Engineering Ltd | Professional & scientific | 2025 |
| Aica Group Ltd | Professional & scientific | 2025 |
| Aida Global Ltd. | Information & communication | 2015 |
| Aigency Ltd | Information & communication | 2024 |
| Aikaz Global Investment Limited | Health & social care | 2021 |
| Aiken Software Limited | Information & communication | 2018 |
| Aimcommunity Limited | Education | 2019 |
| Aimee's Hair & Beauty Ltd | Other services | 2011 |
| Aimora Limited | Administrative & support | 2026 |
| Ainhurst Limited | Professional & scientific | 1967 |
| Airflex Aviation Ltd | Other services | 2018 |
| Airhomeimprovements Ltd | Wholesale & retail | 2026 |
| Airo Energy Ltd | Construction | 2024 |
| Airport Cars Bournemouth Ltd | Transport & logistics | 2025 |
| Airport Parking Limited | Extraterritorial | 1996 |
| Airsoft Central Ltd | Wholesale & retail | 2024 |
| Airsolo Solutions Limited | Health & social care | 2025 |
| Airthrey Court Limited | Households | 1980 |
| Aitcheson Hammond RRM Ltd | Professional & scientific | 2025 |
| Aivi Ltd | Information & communication | 2024 |
| AJ Associates & Advisory Ltd | Administrative & support | 2025 |
| AJ Deliveries Ltd | Transport & logistics | 2025 |
| AJ Developments (Yarmouth) Limited | Construction | 2018 |
| AJ Developments Yarmouth (Lettings) Ltd | Real estate | 2020 |
| AJ Electricalservices Ltd | Construction | 2012 |
| AJ Family Group Ltd | Real estate | 2023 |
| AJ Zion Care Services Ltd | Health & social care | 2024 |
| AJ Zion Limited | Health & social care | 2011 |
| AJ Zion Properties Ltd | Real estate | 2024 |
| AJ Zion Supported Living Limited | Health & social care | 2024 |
| Aj-Greens Ltd | Administrative & support | 2025 |
| AJA Foodz Ltd | Hospitality | 2024 |
| AJAOMI99 Limited | Health & social care | 2024 |
| AJC Stonework Limited | Other services | 2018 |
| Ajer Fit Limited | Wholesale & retail | 2025 |
| Ajerthan Properties Limited | Real estate | 2019 |
| AJF Accommodation Ltd | Real estate | 2023 |
| AJF Properties Ltd | Real estate | 2023 |
| AJG Collective Ltd | Real estate | 2026 |
| Ajgw Consulting Ltd | Information & communication | 2018 |
| AJH Design & Construction Limited | Construction | 2008 |
| AJH Holdings Ltd | Real estate | 2022 |
| AJH Sustainability Ltd | Professional & scientific | 2014 |
| AJL Licenced Ltd | Energy | 2023 |
| AJL Properties Ltd | Real estate | 2024 |
| AJN Property Maintenance Ltd | Construction | 2026 |
| AJS Admin Limited | Public administration | 2025 |
| AJT Garden Maintenance Ltd | Administrative & support | 2023 |
| AK Composite Ltd | Manufacturing | 2023 |
| AK Dream Home Ltd | Real estate | 2024 |
| AK Interior Solutions Ltd | Construction | 2020 |
| AKA Build (Southern) Limited | Construction | 2023 |
| AKA Maintenance (Southern) Limited | Construction | 2014 |
| Akam Consulting Limited | Professional & scientific | 2014 |
| Akasuki Ltd | Health & social care | 2021 |
| AKC Group Holdings Limited | Financial services | 2019 |
| AKD Medical Limited | Health & social care | 2021 |
| AKH Groundworks (Southern) Limited | Construction | 2022 |
| AKH Groundworks Ltd | Construction | 2018 |
| Akinci Pet Care Consulting Ltd | Professional & scientific | 2019 |
| AKJ Electrical Limited | Construction | 2016 |
| Akorus Trading Ltd | Wholesale & retail | 2010 |
| Aksu Financial Consultancy Ltd | Professional & scientific | 2021 |
| AKT Roofing Limited | Construction | 2003 |
| AL Arabiya International Limited | Hospitality | 2016 |
| AL Lawrence Ltd | Information & communication | 2025 |
| AL Makaanah Ltd | Wholesale & retail | 2024 |
| AL Thani Real Estate Management Ltd | Real estate | 2021 |
| Al-Bifolds Limited | Manufacturing | 2021 |
| Al-Reyadha Sports Academy Limited | Administrative & support | 2025 |
| Al-Thani Real Estate Ltd | Real estate | 2016 |
| Alafin Limited | Professional & scientific | 2026 |