| AH & CH Properties Ltd | Real estate | 2025 |
| AH Assessments & Training Ltd | Education | 2019 |
| AH P&H Ltd | Construction | 2026 |
| AHA 21 Properties Limited | Real estate | 2025 |
| Ahadi Rise Limited | Financial services | 2024 |
| Aharrison Ltd | Hospitality | 2025 |
| AHH Property Ltd | Real estate | 2025 |
| AHJ Transport & Recovery Ltd | Transport & logistics | 2025 |
| AHL Maintenance Ltd | Extraterritorial | 2025 |
| Ahmad & Musazai Property Ltd | Real estate | 2026 |
| Ahsan MED Services Ltd | Health & social care | 2025 |
| AI Cloud Tech Limited | Information & communication | 2024 |
| AI Sapori Ltd | Wholesale & retail | 2025 |
| Ai-Ttitude Limited | Information & communication | 2025 |
| AI2GO Solutions Ltd | Information & communication | 2025 |
| AIB Services (Yorkshire) Limited | Real estate | 2024 |
| Aiim Properties Ltd | Real estate | 2019 |
| Aiim Trading Ltd | Health & social care | 2016 |
| AIM Builders Ltd | Construction | 2023 |
| AIM Travel & Tours Ltd | Transport & logistics | 2023 |
| Aiml Technologies Ltd | Information & communication | 2018 |
| Aimless Wandering Ltd | Professional & scientific | 2025 |
| Aindtservices Ltd | Professional & scientific | 2024 |
| Air Climate Ltd | Energy | 2020 |
| Airborne Watches Ltd | Manufacturing | 2025 |
| Aired Innovations Ltd | Wholesale & retail | 2025 |
| Airfoods Limited | Hospitality | 2022 |
| Airline Business Services Ltd | Other services | 2023 |
| AIS Inc Limited | Construction | 2012 |
| AIT Management Ltd | Professional & scientific | 2018 |
| AIZ Properties Ltd | Real estate | 2026 |
| AJ & S Solutions Ltd | Administrative & support | 2020 |
| AJ Contract Services Limited | Administrative & support | 2017 |
| AJ Implants Limited | Health & social care | 2022 |
| AJ MAX Property Ltd | Real estate | 2026 |
| AJ Partitions and Ceilings Ltd | Construction | 2023 |
| AJ Storm Ltd | Real estate | 2026 |
| AJ Wades Real Estate Ltd | Households | 2025 |
| AJ4 Limited | Wholesale & retail | 2004 |
| AJ7 Car Wash Ltd | Wholesale & retail | 2024 |
| AJB Recycling Ltd | Water & waste | 2026 |
| AJC Aggregates Limited | Mining & quarrying | 2007 |
| AJC Accountants Ltd | Professional & scientific | 2007 |
| AJC Security Limited | Administrative & support | 2023 |
| AJC Services (Yorkshire) Limited | Wholesale & retail | 2016 |
| Ajde Ltd | Wholesale & retail | 2018 |
| AJL Interiors Ltd | Construction | 2019 |
| Ajlcladding Ltd | Construction | 2018 |
| Ajlr Cladding Ltd | Construction | 2026 |
| AJM UK Solutions Ltd | Transport & logistics | 2022 |
| AJO Haulage Ltd | Wholesale & retail | 2026 |
| AJS Renewables Services Limited | Professional & scientific | 2024 |
| AK & Partners Limited | Information & communication | 2022 |
| AK Accountant and Book Keepers Ltd | Professional & scientific | 2025 |
| AK Construction & Build Ltd | Construction | 2025 |
| AK Enterprise 6 Ltd | Hospitality | 2025 |
| AK Externals Ltd | Construction | 2019 |
| AK Fire Protection Ltd | Construction | 2022 |
| AK Import-Export Services Ltd | Wholesale & retail | 2025 |
| AK Interior Systems Ltd | Construction | 2025 |
| AK Plastering and Rendering (Yorkshire) Limited | Construction | 2022 |
| Ak-Quatics Ltd | Agriculture & fishing | 2021 |
| AK82 Ltd | Construction | 2018 |
| Akaash Limited | Wholesale & retail | 2022 |
| Akam Corner Shop Limited | Wholesale & retail | 2022 |
| Akbar Balti (Sheffield) Limited | Hospitality | 2006 |
| Akeda Kitchens Ltd | Manufacturing | 2021 |
| AKH Building Services Limited | Construction | 2020 |
| Akhter Associates Limited | Professional & scientific | 2012 |
| Akin Advisory Ltd | Information & communication | 2025 |
| Akitu Botanicals Ltd | Manufacturing | 2021 |
| AKJ Properties Limited | Real estate | 2024 |
| Akka Rentals Limited | Real estate | 2021 |
| Aklass Motors Ltd | Wholesale & retail | 2025 |
| Aklass Real Estate Ltd | Real estate | 2025 |
| AKR Wealth Management Ltd | Financial services | 2017 |
| AL Ahad Foods Limited | Hospitality | 2024 |
| AL Barakah SY Ltd | Wholesale & retail | 2019 |
| AL Door Services Ltd | Construction | 2023 |
| AL NOOR1 Ltd | Hospitality | 2026 |
| AL Property Developments Ltd | Real estate | 2023 |
| AL Quality Ltd | Hospitality | 2019 |
| AL Rayyan&Co Ltd | Hospitality | 2024 |
| AL Sayeed Limited | Wholesale & retail | 2019 |
| AL Shifa Centre Ltd | Health & social care | 2022 |
| Al's Plastering Limited | Construction | 2020 |
| Al-Fire Protection and Construction Ltd | Construction | 2024 |
| Al-Hashimi Ltd | Health & social care | 2017 |
| Al-Hikmah Limited | Health & social care | 2016 |
| Al-Met Limited | Manufacturing | 1985 |
| Al-Muneera | Education | 2004 |
| Al-Shafa Healthcare Limited | Wholesale & retail | 2012 |
| ALA Global Ltd | Extraterritorial | 2013 |
| Alam Excavation Limited | Construction | 2025 |
| Alam Property Holding Ltd | Real estate | 2022 |
| Alamcars Limited | Wholesale & retail | 2025 |
| Alan Bark Limited | Construction | 2015 |
| Alan Brook Construction Limited | Construction | 2005 |
| Alan Shamp Associates Limited | Construction | 1988 |
| Alan Smith & Paul Smith Physiotherapy Ltd | Health & social care | 2004 |