| Air Conditioning Cooling and Heating Ltd | London | 2016 |
| Air Conditioning Maintenance Services (U.K.) Ltd | North Shields | 2003 |
| Air Cool Refrigeration Ltd | Northolt | 2016 |
| Air Corp Industries Limited | Manchester | 2021 |
| Air Energy Limited | Hertford | 2002 |
| Air Falco Limited | Bedford | 2016 |
| Air Fresh Ltd | Wednesbury | 2015 |
| Air H D Ltd | Davyhulme | 2007 |
| Air Hairdressing Limited | Nottinghamshire | 2006 |
| Air Implementation Ltd | Middlesbrough | 2024 |
| Air Law Group Ltd | Tonbridge | 2015 |
| Air League Enterprises Limited | London | 1909 |
| Air League Trust | London | 2009 |
| Air Liquide UK Pension Trustees Limited | Birmingham | 1998 |
| Air Management Solutions Group Limited | Dartford | 2023 |
| Air MAX Limited | Cowbridge | 1993 |
| Air Menzies International Limited | Crawley | 1994 |
| Air Options Limited | Witham | 1998 |
| Air Options UK Limited | Bury St. Edmunds | 2019 |
| Air Park Pro Ltd | London | 2023 |
| Air Partner Aviation Services Limited | Gatwick | 1999 |
| Air Pilots Property Ltd | London | 2018 |
| Air Proof Ltd | London | 2025 |
| Air Records Limited | London | 1974 |
| Air Sea 1 Ltd | Shepperton | 2022 |
| Air Testing Scotland Limited | Biggar | 2011 |
| Air Tightness Testing & Measurement Association | Loudwater | 2011 |
| Air TV Group EBT Trustee Limited | Church Fenton | 2021 |
| Air Vent Holdings Limited | Colchester | 2025 |
| Air Yachting Limited | Chelmsford | 2024 |
| Air&Port Executive Cars Ltd | Salisbury | 2018 |
| Air's Thai Massage Limited | Billericay | 2025 |
| Aira Beauty Studio Ltd | Dagenham | 2023 |
| Airam Demha Y Limited | Sheffield | 2025 |
| Airamped Ltd | London | 2025 |
| Airauto Ltd | Porthcawl | 2016 |
| Airbid Limited | Abbey Village | 2018 |
| Airbles Laundry Service Ltd | Motherwell | 2021 |
| Airbnb UK Limited | London | 2011 |
| Airborne Views Ltd | Bristol | 2017 |
| Airbridge Centre Limited | Birmingham | 2016 |
| Airbrush Body UK Limited | Matlock | 2022 |
| Airbrushed Aesthetics Ltd | Spalding | 2019 |
| Aircare Air Conditioning Ltd | Liverpool | 2004 |
| Aircarerscompanion Ltd | Leeds | 2026 |
| Aircon Worldwide Limited | Cirencester | 2006 |
| Aircounsel Ltd. | London | 2019 |
| Aircraft Avionics Ltd | Royston | 2021 |
| Aircraft DM Ltd | London | 2026 |
| Aircraft Engineer Services Limited | Harrow | 2025 |
| Aircraft Experts Limited | Barnet | 2024 |
| Aircrete Limited | Leicester | 1987 |
| Aircrete Products Association Ltd | Leicester | 1981 |
| Aircyclone Purifier Systems Ltd | Milton Keynes | 2023 |
| Airdeska Ltd | Cheltenham | 2019 |
| Airdrie Fades Ltd | Carluke | 2026 |
| Airdrie Ltd | Airdrie | 2022 |
| Airdrie Taxis Limited | Lanarkshire | 1998 |
| Airdriving Ltd | Romford | 2018 |
| Airdrum Limited | East Hoathly | 2006 |
| Airduct Compliance Ltd | Ilford | 2017 |
| Aire Beauty Ltd | Sheffield | 2023 |
| Aire Salon Limited | Nottingham | 2025 |
| Aire Valley House Ltd | Bradford | 2021 |
| Airecon Limited | Leeds | 2016 |
| Airedale GAS Services Limited | Keighley | 2017 |
| Airehead Beauty Limited | Shipley | 2020 |
| Airehead Limited | Shipley | 2020 |
| Airey Wedding Services Limited | Tonbridge | 2014 |
| Airfarmer Ltd | Milton Keynes | 2024 |
| Airfield Consultants Limited | Market Harborough | 2012 |
| Airfield Design Ltd | Ashford | 2010 |
| Airfield Studio Limited | Melton Mowbray | 2014 |
| Airflex Aviation Ltd | Bournemouth | 2018 |
| Airgard-Uv Ltd | Rochester | 2021 |
| Airgid Beithe Limited | Leicester | 2023 |
| Airglow London Ltd | London | 2025 |
| Airgreements Ltd | London | 2020 |
| Airhost Direct Ltd | Banbury | 2021 |
| Airies Flowtec Limited | Airth | 2017 |
| Airis Energy Installations Limited | Thornton-Cleveleys | 2024 |
| Airis Energy Limited | Thornton-Cleveleys | 2023 |
| Airis Energy Services Limited | Thornton-Cleveleys | 2024 |
| Airis Energy Solutions Ltd | Thornton Cleveleys | 2017 |
| Airlie Street Hall Limited | Alyth | 2017 |
| Airline Business Services Ltd | Rotherham | 2023 |
| Airline IT Consulting Limited | Exeter | 2018 |
| Airline Placement Limited | Altrincham | 2004 |
| Airline Training Associates Limited | London | 1984 |
| Airlines 4 Dialogue Limited | Peterborough | 2006 |
| Airlines Global Solutions Limited | Leicestershire | 2020 |
| Airlines UK - the Association of UK Airlines Limited | London | 2002 |
| Airlinesolutions Ltd | London | 2017 |
| Airlog Solutions Limited | London | 2018 |
| Airmar Supply Ltd | London | 2013 |
| Airmasters (UK) Ltd | Lutterworth | 2014 |
| Airmen Technical Services Limited | Stevenage | 2024 |
| Airmic Limited | London | 1977 |
| Airmid Therapies Ltd | Newry | 2017 |
| Airnet E-Sim Ltd | London | 2025 |