| Airinei Tech Ltd | London | 2020 |
| Airis Global Limited | Ruislip, | 2025 |
| Airis Security Technologies Limited | London | 2013 |
| Airis Stack Ltd | London | 2023 |
| Airit Consulting Ltd | Lytham St. Annes | 2014 |
| Airivu Innovation Machina (UK) Limited | London | 2025 |
| Airiz Ltd | Leicester | 2026 |
| Airkab UK Ltd | Grimsby | 2017 |
| Airkick Innovations Ltd | Glasgow | 2024 |
| Airless Audio Ltd | Grantham | 2026 |
| Airlie Enterprises Limited | Camberley | 2002 |
| Airlie Matilda Limited | Bristol | 2012 |
| Airlienet IT Limited | London | 2016 |
| Airlift Consulting Limited | Flintshire | 2008 |
| Airlift Global Holdings Ltd | London | 2018 |
| Airlime Ltd | Leicester | 2023 |
| Airline Business Solutions Limited | Swindon | 2007 |
| Airline Insights Limited | London | 2014 |
| Airline Network Technology Services Limited | Bookham | 2015 |
| Airlinen Ltd | London | 2023 |
| AIRLINER1 Europe Limited | Glasgow | 2013 |
| Airliners Live Ltd | Eccles | 2022 |
| Airlines Market Limited | Birmingham | 2017 |
| Airlink Technology Services Ltd | London | 2023 |
| Airlocker Ltd | Hitchin | 2024 |
| Airly Air Quality Services Ltd | Warwick | 2021 |
| Airmageddon Productions Ltd | London | 2015 |
| Airmap Ltd | London | 2023 |
| Airmarkt Ltd | Twickenham | 2025 |
| Airmedia Limited | London | 2023 |
| Airmergent Limited | Malvern | 2024 |
| Airmeter Ltd | Edinburgh | 2025 |
| Airmonk Ltd | Oxford | 2025 |
| Airmyprayer Limited | Aylesbury | 2017 |
| Airnet Project Services Ltd | Harrow | 2019 |
| Airnite Limited | March | 1992 |
| Airnode Limited | Edinburgh | 2017 |
| Airnx Ltd | Bingley | 2018 |
| Airo Games Ltd. | Edinburgh | 2017 |
| Airo Limited | Glasgow | 2008 |
| Airo Response Limited | London | 2024 |
| Airobot Dynamics Limited | Walkerburn | 2021 |
| Airobotiq Talent Ltd | Bromley | 2025 |
| Airofin Trading Limited | Altrincham | 2024 |
| Airohealth Limited | Solihull | 2025 |
| Airomatrix Technologies Ltd | Coventry | 2024 |
| Airon Switch Services Ltd | Purley | 2009 |
| Aironix Ltd | London | 2026 |
| Aironix Tech Ltd | London | 2023 |
| Airopad Ltd | Wolverhampton | 2026 |
| Airops Software Limited | Farnborough | 1989 |
| Airos Tech Ltd | Burnley | 2025 |
| Airowire Networks PVT Ltd | London | 2024 |
| Airowsafe Limited | Gateshead | 2010 |
| Airozen Innovation Ltd | Weybridge | 2025 |
| Airpage Limited | Peterborough | 1991 |
| Airpay Finance Ltd | London | 2023 |
| Airpay Global Limited | Leeds | 2019 |
| Airpedia Ltd | London | 2025 |
| Airpelago Ltd | London | 2024 |
| Airphone Communications Limited | Apollo Road | 1983 |
| Airphone Limited | Peterborough | 1994 |
| Airplace Ltd | | 1988 |
| Airplan Flight Equipment Limited | Manchester | 1973 |
| Airplane Mode IP Ltd | London | 2025 |
| Airplus International Limited | London | 2002 |
| Airpoint Limited | Grimsby | 2003 |
| Airport Action Ltd | Wednesbury | 2024 |
| Airport Acumen Limited | Luton | 2023 |
| Airport Direct Travel Limited | Exeter | 2006 |
| Airport Engineering Solutions Limited | Fareham | 2021 |
| Airport Information Systems Limited | Mansfield | 1990 |
| Airport Staff Discounts Ltd | London | 2024 |
| Airport Taxis Bristol Ltd | Bristol | 2024 |
| Airport World Ltd | Crawley | 2025 |
| Airportlabs Limited | London | 2015 |
| Airportnet Limited | West Yorkshire | 1999 |
| Airpos Limited | Belfast | 2009 |
| Airproof Wireless Limited | North Dean | 2016 |
| Airquake Audio Ltd | Hove | 2021 |
| Airqx Technology Limited | London | 2023 |
| Airrchip Ltd | Harrow | 2023 |
| Airrrr Ltd | Melton Mowbray | 2023 |
| Airsa Solutions Ltd | Hull | 2026 |
| Airsat Data Ltd | Leicester | 2023 |
| Airshares Limited | London | 2025 |
| Airship Interactive Ltd | Manchester | 2010 |
| Airship Limited | Winchester | 2009 |
| Airship Send Ltd | London | 2025 |
| Airship Services Limited | Abingdon | 2001 |
| Airsid Ltd | Manchester | 2025 |
| Airside Data & Training Ltd | Canterbury | 2006 |
| Airside Labs Ltd | Bognor Regis | 2025 |
| Airsip Limited | London | 2025 |
| Airsland Ltd | London | 2026 |
| Airslie Ltd | London | 2011 |
| Airsmat Limited | London | 2020 |
| Airsort Ltd | Manchester | 2026 |
| Airsource Ltd. | Cambridge | 2003 |
| Airspace Software Limited | Sevenoaks | 1999 |