| Ahitanseo Ltd | Information & communication | 2023 |
| AHJ Transport Ltd | Transport & logistics | 2024 |
| Ahlulbayt CIC | Health & social care | 2024 |
| AHMAD24/7 Heat & Plumbing Ltd | Construction | 2025 |
| Ahmed Media Limited | Information & communication | 2002 |
| AHO Investments Ltd | Wholesale & retail | 2021 |
| AHS Deals Limited | Wholesale & retail | 2024 |
| Ahujaconsultant Limited | Administrative & support | 2024 |
| AHV Property LLP | | 2025 |
| Ahvisaconsultancy Limited | Administrative & support | 2024 |
| Ahvt Property Ltd | Real estate | 2021 |
| AI Car Clinic Ltd | Wholesale & retail | 2026 |
| AI Digital Consultancy Limited | Real estate | 2020 |
| AI Navigator Ltd | Wholesale & retail | 2026 |
| AI Plumber Ltd | Construction | 2025 |
| AI Plumbing and Heating Maintenance Limited | Construction | 2025 |
| AI Travel Desk Ltd | Administrative & support | 2023 |
| AIA Chauffeur Ltd | Transport & logistics | 2026 |
| AIB International Group Limited | Other services | 2016 |
| Aiden Supplements Limited | Wholesale & retail | 2024 |
| Aigentix Ltd | Information & communication | 2025 |
| AIK Property Limited | Real estate | 2021 |
| AIM Higher Tuition Services Limited | Education | 2015 |
| AIM Properties (Slough) Limited | Real estate | 2024 |
| AIM Transporters Limited | Transport & logistics | 2018 |
| Aimak Ltd | Information & communication | 2024 |
| Aiml Ltd | Information & communication | 2020 |
| Aims Advisory Ltd | Professional & scientific | 2024 |
| Aims Business Consultants Ltd | Professional & scientific | 2025 |
| Aimtree Limited | Real estate | 2023 |
| Ainhoa's Ltd | Transport & logistics | 2017 |
| Ainstrading UK Ltd | Wholesale & retail | 2018 |
| Air Cargo LHR Ltd | Transport & logistics | 2023 |
| Air Seal Glazing Limited | Construction | 2010 |
| Air Time Parking Ltd | Transport & logistics | 2017 |
| Air to Road Limited | Transport & logistics | 1996 |
| Air Xpress Limited | Transport & logistics | 2023 |
| Aircabs Ltd | Transport & logistics | 2026 |
| Airconsulteam Limited | Professional & scientific | 2018 |
| Airhop Ltd | Transport & logistics | 2021 |
| Airport Assists Private Limited | Administrative & support | 2025 |
| Airport Car London Ltd | Transport & logistics | 2025 |
| Airport City Transfers Ltd | Transport & logistics | 2019 |
| Airport Motors (London) Limited | Wholesale & retail | 1981 |
| Airport Pickup London Ltd | Transport & logistics | 2017 |
| Airport Radio Cars (UK) Ltd | Transport & logistics | 2013 |
| Airport Rides Ltd | Transport & logistics | 2022 |
| Airport Services Limited | Transport & logistics | 1982 |
| Airport Taxi 24/7 Ltd | Transport & logistics | 2026 |
| Airport Wincars Limited | Transport & logistics | 2023 |
| Airportparkingcompare Limited | Other services | 2019 |
| Airports Express Taxis Limited | Transport & logistics | 2026 |
| Airports Links Ltd | Transport & logistics | 2025 |
| Airspan Communications Limited | Information & communication | 1998 |
| Airsupply Shipping Agents Ltd | Transport & logistics | 1989 |
| Airsym Ltd | Transport & logistics | 2017 |
| Airvan Mobile 24/7 Tyres Ltd | Manufacturing | 2025 |
| Airway House Ltd | Real estate | 2014 |
| Aish & Co Ltd | Transport & logistics | 2019 |
| Aisling a Thagann Fior Ltd | Arts & recreation | 2023 |
| Aistar Limited | Health & social care | 2022 |
| AIX Compute Systems Limited | Wholesale & retail | 2026 |
| AJ Barber (Slough ) Ltd | Other services | 2025 |
| AJ Berkshire Ltd | Professional & scientific | 2023 |
| AJ Construction London Ltd | Construction | 2023 |
| AJ Costa Ltd | Transport & logistics | 2018 |
| AJ Global Ltd | Transport & logistics | 2020 |
| AJ Iconic Food Ltd | Hospitality | 2019 |
| AJ Indus Ltd | Wholesale & retail | 2020 |
| AJ London Logistic Ltd | Wholesale & retail | 2025 |
| AJ Prime Investments Ltd | Real estate | 2021 |
| AJ Project Consulting Ltd | Professional & scientific | 2026 |
| AJ Rose Cars Limited | Wholesale & retail | 2023 |
| AJ Urban Homes Ltd | Financial services | 2024 |
| AJ Wealth Ltd | Real estate | 2025 |
| AJ Wholesales (Slough) Ltd | Administrative & support | 2014 |
| AJ7 Limited | Information & communication | 2019 |
| AJB Property Investors Ltd | Administrative & support | 2025 |
| Ajey Developments Ltd | Real estate | 2019 |
| Ajfilms Ltd | Information & communication | 2020 |
| AJH Fencing & Groundworks Ltd | Administrative & support | 2022 |
| AJH Tradingwell Limited | Wholesale & retail | 2024 |
| AJJ Trading Limited | Construction | 2012 |
| AJK Transport Services Limited | Transport & logistics | 2025 |
| AJL Best Practice Ltd | Health & social care | 2025 |
| Ajlogistics&Removals Ltd | Wholesale & retail | 2025 |
| Ajmer Ltd | Wholesale & retail | 2022 |
| Ajmer Properties Ltd | Real estate | 2026 |
| Ajmer Singh Ltd | Construction | 2021 |
| AJR Edibles and Essentials Ltd | Wholesale & retail | 2026 |
| Ajsp Supplies Ltd | Construction | 2025 |
| AJT Autocare Slough Ltd | Wholesale & retail | 2021 |
| Ajtm Ltd | Wholesale & retail | 2026 |
| AJW Plastering Ltd | Construction | 2024 |
| Ajwah Limited | Wholesale & retail | 2025 |
| AJZ Marketplace Ltd | Wholesale & retail | 2022 |
| AK BRO Slough Limited | Wholesale & retail | 2024 |
| AK Conduit Ltd | Financial services | 2024 |
| AK Freight Express Limited | Transport & logistics | 2026 |
| AK Horizon Ltd | Wholesale & retail | 2025 |