| AIM4HIGH Ltd | Wholesale & retail | 2023 |
| Aimal Khan Ltd | Health & social care | 2019 |
| Aimanzain Global Consultant Ltd | Other services | 2025 |
| Aimchlo Limited | Professional & scientific | 2021 |
| Aime 52 Ltd | Information & communication | 2025 |
| Aimfur Health Limited | Wholesale & retail | 2013 |
| Aimly Limited | Health & social care | 2023 |
| Aimp SPV Ltd | Real estate | 2021 |
| Aimpro Digital Ltd | Information & communication | 2020 |
| Aimpro Housing Ltd | Hospitality | 2018 |
| Aims ARR Properties Ltd | Real estate | 2025 |
| Aims Elite Services Limited | Wholesale & retail | 2020 |
| Aims Energy Limited | Construction | 2023 |
| Aims Group of Company Ltd | Wholesale & retail | 2024 |
| Aims Management Ltd | Wholesale & retail | 2015 |
| Aims Property Ltd | Real estate | 2024 |
| Aims Services Ltd | Real estate | 2020 |
| Aimsbury Court 1-6 RTM Company Limited | Households | 2011 |
| Aimsbury Court 10-15 RTM Company Limited | Households | 2011 |
| Aimsbury Court 7-9 RTM Company Limited | Households | 2011 |
| Aimsell Ltd | Wholesale & retail | 2025 |
| Aimtech Global Ltd | Wholesale & retail | 2020 |
| Aimtri Limited | Construction | 2024 |
| AIN UK Limited | Wholesale & retail | 2023 |
| Ain'T Half Limited | Information & communication | 2022 |
| Aina 'S Foods Limited | Manufacturing | 2022 |
| Aina Builders Ltd | Construction | 2022 |
| Aina Couture Ltd | Other services | 2025 |
| Aina's Nexus Limited | Wholesale & retail | 2025 |
| Ainnovate UK Ltd | Information & communication | 2026 |
| Ainsley Autos Ltd | Wholesale & retail | 2023 |
| Ainsworth Country Ltd | Wholesale & retail | 2020 |
| Ainsworth Developments Ltd | Construction | 2021 |
| AIO Homes Ltd | Real estate | 2025 |
| Aiomoshield Ltd | Information & communication | 2025 |
| Aionia Limited | Other services | 2013 |
| AIP352 Ltd | Administrative & support | 2017 |
| AIQ Enterprise Limited | Wholesale & retail | 2025 |
| Air 1 Travel & Tours Ltd | Administrative & support | 2024 |
| Air AID Travels Limited | Administrative & support | 2023 |
| Air Ambulance Recycling Ltd | | 2011 |
| Air Ambulance Support Community Interest Company | | 2010 |
| Air and Acoustic Consultants (Birmingham) Limited | Professional & scientific | 2024 |
| Air and Acoustic Consultants (London) Limited | Professional & scientific | 2024 |
| Air and Acoustic Consultants Limited | Professional & scientific | 2018 |
| Air Assist Ltd | Energy | 2024 |
| Air Bar Ltd | Hospitality | 2017 |
| Air Bidco Limited | Financial services | 2014 |
| Air Blue Security Ltd | Administrative & support | 2017 |
| Air Brite Ltd | Administrative & support | 2025 |
| Air Cool Solutions Ltd. | Construction | 2018 |
| Air Ducters Limited | Professional & scientific | 2018 |
| Air END Repair Limited | Manufacturing | 2011 |
| Air Enterprise Limited | Administrative & support | 2015 |
| Air Link Group Limited | Construction | 2005 |
| Air Liquide Advanced Business and Technologies UK Limited | Energy | 2013 |
| Air Liquide Limited | Manufacturing | 1987 |
| Air Liquide OIL and GAS Services Limited | Manufacturing | 2013 |
| Air Liquide UK Limited | Manufacturing | 1928 |
| Air Liquide UK Pension Trustees Limited | Other services | 1998 |
| Air of Awakening Ltd | Health & social care | 2025 |
| Air Publishing Limited | Administrative & support | 2005 |
| Air Purex Ltd | Real estate | 2008 |
| Air Recruiting Ltd | Administrative & support | 2023 |
| Air Space Technology Ltd | Wholesale & retail | 2019 |
| Air Sylhet Ltd | Extraterritorial | 2007 |
| Air Tools & Compressor Services 2000 Limited | Manufacturing | 2008 |
| Air Vent Quality Ltd | Construction | 2019 |
| Airakaz Limited | Transport & logistics | 2019 |
| Airborne Escapes Ltd | Administrative & support | 2024 |
| Airbridge Centre Limited | Other services | 2016 |
| Airconditioning and Mechanical Services Limited | Construction | 2008 |
| Airedale Investment Holdings | Financial services | 2026 |
| Airergo Ltd | Transport & logistics | 2024 |
| Aires Ltd | Wholesale & retail | 2018 |
| Airflux Limited | Transport & logistics | 2020 |
| Airfreight Worldwide Limited | Transport & logistics | 1993 |
| Airgem Delta Ltd | Manufacturing | 2009 |
| Airguard Procurement Services Limited | Wholesale & retail | 2022 |
| Airjack 2000 Limited | Manufacturing | 2002 |
| Airlines Market Limited | Information & communication | 2017 |
| Airlink 4 U Limited | Administrative & support | 2004 |
| Airlink Communication Limited | Wholesale & retail | 2023 |
| Airmax Developments Limited | Administrative & support | 2005 |
| Airmax Group Limited | Professional & scientific | 2004 |
| Airmax Holdings Limited | Financial services | 2021 |
| Airmax Remote Limited | Administrative & support | 2002 |
| Airmily Limited | Wholesale & retail | 2017 |
| Airmove Installations Limited | Construction | 2005 |
| Airomet (Worcester) Ltd | Construction | 2001 |
| Airparks Services Limited | Other services | 1991 |
| Airpath Mechanic Ltd | Wholesale & retail | 2021 |
| Airphone Midlands Ltd | Wholesale & retail | 2026 |
| Airplus Travels Limited | Administrative & support | 2016 |
| Airport Placements Ltd | Administrative & support | 2022 |
| Airport Travel Limited | Administrative & support | 1987 |
| Airporta Limited | Transport & logistics | 2022 |
| Airpro Air Conditioning Limited | Construction | 2022 |
| Airside Systems Ltd | Construction | 2024 |
| Airsoft Shien Company Limited | Manufacturing | 2024 |