| Air Brickwork Ltd | Construction | 2024 |
| Air LA Carte Limited | Hospitality | 2026 |
| Air Luton Ltd | | 1984 |
| Airacart Ltd | Wholesale & retail | 2025 |
| Aircargo & Container Services Limited | Transport & logistics | 1984 |
| Airco Motors Limited | Wholesale & retail | 2026 |
| Airdennis Ltd | Manufacturing | 2015 |
| Airflow Heating Limited | Construction | 1987 |
| Airolay Ltd | Wholesale & retail | 2024 |
| Airport Acumen Limited | Information & communication | 2023 |
| Airport Park Birmingham Ltd | Other services | 2023 |
| Airport Park Luton Ltd | Other services | 2023 |
| Airport Park Manchester Ltd | Other services | 2023 |
| Airport Park One Limited | Administrative & support | 2019 |
| Airport Parking Group Ltd | Other services | 2024 |
| Airport Parking Luton Express Limited | Other services | 2023 |
| Airport Parking Luton Limited | Administrative & support | 2012 |
| Airport Parking Manchester Ltd | Other services | 2023 |
| Airport TR4NSPORT SPECI4LISTS Limited | Transport & logistics | 2025 |
| Airport Transfers Aylesbury Limited | Transport & logistics | 2020 |
| Airportcabsuk Ltd | Transport & logistics | 2023 |
| Airsir Ltd | Wholesale & retail | 2025 |
| Airyx Ltd | Wholesale & retail | 2024 |
| Aisha Bibi Ltd | Real estate | 2025 |
| Aishad Property Finance Ltd | Financial services | 2020 |
| Aisyah Zain Productions Ltd | Professional & scientific | 2025 |
| AIT Traders Ltd | Wholesale & retail | 2025 |
| Aitecom Limited | Wholesale & retail | 2025 |
| Aiva Habitation Limited | Wholesale & retail | 2022 |
| AIZ Trade Solutions UK Ltd | Wholesale & retail | 2023 |
| Aizah AK Limited | Wholesale & retail | 2025 |
| Aizahra Trading Ltd | Information & communication | 2025 |
| AJ & AP Holdings Ltd | Real estate | 2025 |
| AJ & Construction Ltd | Other services | 2023 |
| AJ and Adams Ltd | Real estate | 2026 |
| AJ Autocare Luton Limited | Wholesale & retail | 2019 |
| AJ Catering Repairs Ltd | Construction | 2025 |
| AJ Construction Luton Limited | Construction | 2026 |
| AJ Home Renovations and Repairs Ltd | Construction | 2024 |
| AJ Kinsman Ltd | Real estate | 2021 |
| AJ Nails & Beauty Supply Ltd | Real estate | 2013 |
| AJ Property London Limited | Real estate | 2021 |
| AJ RAI Properties Limited | Real estate | 2018 |
| AJ Transport Services Limited | Transport & logistics | 2018 |
| Aj's Lemon Chicken and Pizza Ltd | Hospitality | 2025 |
| AJ3Z Legal Services Ltd | Professional & scientific | 2026 |
| AJA Property Developments Ltd | Real estate | 2024 |
| Ajan Construction Ltd | Construction | 2018 |
| Ajay Contruction (UK) Ltd | Construction | 2022 |
| Ajay Sookraj Ltd | Professional & scientific | 2025 |
| AJB Housing Limited | Professional & scientific | 2021 |
| AJD Advanced Aesthetics Ltd | Other services | 2025 |
| AJD Builders Ltd | Construction | 2015 |
| Ajesha LLP | | 2025 |
| AJG Electrical Contractors Ltd | Construction | 2022 |
| Ajile Ltd | Information & communication | 2015 |
| Ajjjj Electrical Ltd | Construction | 2025 |
| AJK Builders & Renovators Ltd | Construction | 2019 |
| AJK Business Solutions Limited | Wholesale & retail | 2021 |
| AJK Carpet Ltd | Wholesale & retail | 2021 |
| AJK247 Limited | Information & communication | 2025 |
| AJM House Developments Limited | Real estate | 2017 |
| Ajm's Carpentry Ltd | Construction | 2019 |
| AJR & Alliance Ltd | Real estate | 2017 |
| AJS Industrial Canopy Cleaning Services Ltd | Administrative & support | 2022 |
| AJV Fortuna Ltd | Real estate | 2024 |
| AK Ace Electrical Ltd | Construction | 2025 |
| AK Advisors Ltd | Professional & scientific | 2024 |
| AK Build Services Ltd | Construction | 2020 |
| AK Composite Doors Ltd. | Manufacturing | 2019 |
| AK Education Consultancy Ltd | Education | 2016 |
| AK Eyecare Ltd | Health & social care | 2016 |
| AK Food and Vine Ltd | Wholesale & retail | 2026 |
| AK Foods and Wine Ltd | Wholesale & retail | 2021 |
| AK General Limited | Other services | 2016 |
| AK Guardforce Security Ltd | Administrative & support | 2020 |
| AK Heating & Cooling Ltd | Construction | 2020 |
| AK Hub Limited | Wholesale & retail | 2025 |
| AK Investments 2019 Ltd | Other services | 2019 |
| AK Jewellers Limited | Wholesale & retail | 2021 |
| AK Khan Motors Ltd | Wholesale & retail | 2026 |
| AK Lionheart Security Ltd | Administrative & support | 2021 |
| AK Motorsport Ltd | Wholesale & retail | 2020 |
| AK Premium Events Ltd | Administrative & support | 2019 |
| AK Promedics Limited | Health & social care | 2022 |
| AK Property Luton Ltd | Real estate | 2024 |
| AK Randhawa Contract Ltd | Construction | 2025 |
| AK Shehu Investment Holdings Limited | Financial services | 2025 |
| AK Shehu Limited | Construction | 2022 |
| AK Tejdrine Investments Ltd | Real estate | 2025 |
| AK Transport & Motors Ltd | Transport & logistics | 2024 |
| AK Transportation Ltd | Transport & logistics | 2021 |
| AK Valet Service Limited | Other services | 2023 |
| AK Windows South Limited | Construction | 2003 |
| Ak's Digital Marketing & Photography Limited | Manufacturing | 2026 |
| Ak-Gill Construction. Ltd | Construction | 2023 |
| AK94 Limited | Wholesale & retail | 2025 |
| AKA Corporation Limited | Wholesale & retail | 2025 |
| AKA1998 Services Ltd | Health & social care | 2022 |
| Akaal Transportation Ltd | Transport & logistics | 2026 |