| Airbnb Payments UK Limited | London | 2015 |
| Airbnb UK Services Limited | London | 2018 |
| Airborne Environmental Consultants EOT Limited | Manchester | 2024 |
| Airborne Financial Services Limited | Leicester | 2011 |
| Airborne Mortgage Solutions Ltd | Leicester | 2018 |
| Airborne Taxi Services Limited | London | 1946 |
| Airbourne Holdings Limited | Derby | 2015 |
| Airbox Holdings Limited | Wantage | 2023 |
| Aircare Holdings Limited | Cramlington | 2023 |
| Aircheck Holdings Ltd | Biggleswade | 2024 |
| Airclaims Group (Overseas) Limited | Hounslow | 1983 |
| Aircomm Holdings Ltd | London | 2017 |
| Aircon Group Holdings Ltd | Stockton-On-Tees | 2023 |
| Aircon Holdings Limited | Leeds | 2025 |
| Aircraft Home Holdings Ltd | London | 2023 |
| Aircraft Leasing IV Limited | London | 2016 |
| Aircraft Leasing VII Limited | London | 2020 |
| Aircraft Risk Company (London) Limited | London | 2023 |
| Aircs U.K. Ltd | Leominster | 2020 |
| Aird Holdings Limited | Llandysul | 2021 |
| Airdbheag Ltd | Angus | 2024 |
| Aire Capital Ltd | London | 2018 |
| Aire London Nobel House Holdco Limited | London | 2023 |
| Aire UK Canada Water Leaseco (A2) Limited | London | 2021 |
| Aire-Sales Holdings Limited | Glasgow | 2012 |
| Airea Floor Coverings Limited | West Yorkshire | 2000 |
| AIREA51 Holdings Ltd | Telford | 2024 |
| Airebox Ltd | Leeds | 2007 |
| Airedale Escalator Holdings Limited | Keighley | 2019 |
| Airedale Finance Ltd | Keighley | 2022 |
| Airedale Financial Limited | Tenby | 2023 |
| Airedale Fleet Resources Limited | Leeds | 2014 |
| Airedale Investment Holdings | Birmingham | 2026 |
| Airedale Newco Limited | Leeds | 2023 |
| Airedale Ventures Limited | London | 2019 |
| Airengy UK Bess 1 Ltd | London | 2026 |
| Airevalley Independent Financial Advisors Limited | West Yorkshire | 2002 |
| Airfield Farms Holdings Limited | Nr Lutterworth | 2019 |
| Airfield Holdings Limited | Woodbridge | 2021 |
| Airflex Investments Limited | Nottingham | 2024 |
| Airflow Cooling EOT Limited | Sheffield | 2024 |
| Airflow Group Holdings Limited | Sheffield | 2021 |
| Airgead Calpa Partners Limited | London | 2017 |
| Airgead Investments Ltd | Sutton | 2017 |
| Airhop Holdings Limited | Bristol | 2018 |
| Airies Holdco Limited | Aberdeen | 2015 |
| Airies Technology Limited | Tonbridge | 2021 |
| Airies Topco Limited | Aberdeen | 2015 |
| Airis Security Holdings Limited | London | 2022 |
| Airitech Ltd | Cardiff | 2016 |
| Airivo London Limited | Hanwell | 2018 |
| Airlert Limited | Newton Abbot | 2024 |
| Airlie Unsworth Holdings Ltd | Towcester | 2022 |
| Airline Catering & Retail Invest Asia Pacific Limited | London | 2023 |
| Airline Catering & Retail Invest Brazil Limited | London | 2023 |
| Airline Catering & Retail Invest Europe Africa Limited | London | 2023 |
| Airline Catering & Retail Invest Europe Limited | London | 2025 |
| Airline Catering & Retail Invest Latin America Limited | London | 2023 |
| Airline Rotables (UK Holdings) Limited | Bicester | 1991 |
| Airlite Finance Limited | | 1959 |
| Airlogix Holdings Ltd | London | 2025 |
| Airmax Holdings Limited | Birmingham | 2021 |
| Airmic II Limited | London | 1998 |
| Airnesco Group Holdings Limited | Farnham | 2025 |
| Airnet Communications Limited | London | 2003 |
| Airnow Limited | London | 2017 |
| Airnow Technology Holdings Ltd | Leeds | 2023 |
| Airos Group Limited | Lymington | 2023 |
| Airos Nevo Ltd | Blackburn | 2025 |
| Airoule UK Ltd | London | 2018 |
| Airp Holdings Ltd | Inverness | 2020 |
| Airport City (Asset Manager) Limited | Manchester | 2013 |
| Airport Dimensions Partnership Holdings Limited | London | 2021 |
| Airport Estates Limited | Manchester | 2003 |
| Airport Group Investments Limited | London | 2007 |
| Airport House Redhill Limited | Horsted Keynes | 2025 |
| Airport Property H1 Limited | London | 2012 |
| Airscream 313 Holdings Limited | Bristol | 2022 |
| Airselfie Holdings Limited | London | 2016 |
| Airserve Investments Limited | London | 2022 |
| Airship Interactive (Holdings) Ltd | Alderley Edge | 2024 |
| Airside Enterprises Ltd | Abingdon | 2025 |
| Airside Investments Ltd | Abingdon | 2015 |
| Airstem Limited | Chichester | 2014 |
| Airstream Ventures Limited | London | 2023 |
| Airstream Works Holdings Limited | Huddersfield | 2018 |
| Airswift Global Limited | Salford | 2021 |
| Airswift Trustees Limited | Salford | 2020 |
| Airtag Limited | Newport Pagnell | 2024 |
| Airtechnology Pension Trustees Limited | Leicester | 2000 |
| Airtel Africa PLC | London | 2018 |
| Airtel Africa Telesonic Holdings Limited | London | 2021 |
| Airthrey Holdings Limited | London | 2025 |
| Airtyme Ltd | London | 2024 |
| Airun Investments Limited | London | 2019 |
| Airus Global Limited | London | 2022 |
| Airwallex (UK) Limited | London | 2016 |
| Airwallex Capital (UK) Limited | London | 2024 |
| Airwallex Treasury (UK) Limited | London | 2026 |
| Airway Group Limited | St. Ives | 2012 |