| Airbound Ltd | Crewe | 2026 |
| Airbox Ltd | Cramlington | 2023 |
| Airbrush Mastery Limited | Wisbech | 2025 |
| Aircol (Collections) Limited | Church Road | 1986 |
| Aircrafft Designs Limited | Kings Langley | 2018 |
| Airdisplays.Com Limited | Sandy | 2015 |
| Airdomes Limited | Pontypridd | 2010 |
| Airdrie Football Club Limited | Airdrie | 2002 |
| Airdrie Youth Limited | Glasgow | 2025 |
| Airdrieonians FC Ltd | Airdrie | 1965 |
| Aire Ancient Baths London Ltd. | London | 2017 |
| Aire Golf Ltd | Huddersfield | 2026 |
| Aire Gymnastics Club Ltd | Bradford | 2025 |
| Aire Music CIC | Bradford | 2025 |
| Aire Padel Limited | Bingley | 2025 |
| Aire Pilates Limited | London | 2026 |
| Aire Place Studios C.I.C. | Leeds | 2016 |
| Aire Valley Gymnastics Limited | Keighley | 2015 |
| Aire Vitality Limited | London | 2026 |
| AIREA51 Limited | Telford | 2017 |
| Airealism Limited | London | 2009 |
| Aireborough Gymnastics Club Ltd | Leeds | 2013 |
| Aireborough Thai Boxing Limited | Leeds | 2010 |
| Airedale Amateur Boxing Club CIC | Castleford | 2025 |
| Airedale Amusements Ltd | York | 2023 |
| Airedale and Pennine Motor Car Club Ltd | Bradford | 2015 |
| Airedale SO Productions Ltd | Cleckheaton | 2025 |
| Airedecor Ltd | London | 2025 |
| Aireplay Padel Ltd | Lothersdale | 2026 |
| Airfield Active Ltd | Toomebridge | 2021 |
| Airfield Research Group Ltd | Huntingdon | 2014 |
| Airfield Shoot Ltd | Spalding | 2021 |
| Airfitness Ltd | London | 2020 |
| Airgun Hunting Solutions Ltd | Hull | 2015 |
| Airhop Bristol Limited | Bristol | 2015 |
| Airhop Guildford Limited | Bristol | 2016 |
| Airhop New Site 1 Limited | Bristol | 2023 |
| Airhop New Site 2 Limited | Bristol | 2024 |
| Airhop New Site 3 Limited | Bristol | 2024 |
| Airhop New Site 4 Limited | Bristol | 2024 |
| Airhop New Site 5 Limited | Bristol | 2024 |
| Airies Gymnastics Club Ltd | Hemel Hempstead | 2018 |
| Airing CIC | London | 2016 |
| Airkart Ltd | Rugeley | 2022 |
| Airlive Limited | London | 2016 |
| Airlock Theatre Limited | London | 2022 |
| Airmaxx Events Limited | Bolton | 2019 |
| Airmyn Padel Ltd | Bury St. Edmunds | 2026 |
| Airobowl Limited | Halifax | 2026 |
| Airpitch International Ltd | Chelmsford | 2023 |
| Airplay Inflatables Ltd | Wythenshawe | 2020 |
| Airplay TV Ltd | | 2003 |
| Airplayer Ltd | Surrey | 2006 |
| Airship Heritage Trust | | 1987 |
| Airsoft (GB) Limited | Sudbury | 2026 |
| Airsoft Armourer Ltd | Lincoln | 2022 |
| Airsoft Cardiff Limited | Cardiff | 2016 |
| Airsoft Evolution Ltd | Canterbury | 2021 |
| Airsoft League Ltd | Glasgow | 2025 |
| Airsoft Warrior Ltd | Leicester | 2022 |
| Airsoftgreatbritain Limited | Maidstone | 2015 |
| Airspace Gallery | Stoke-On-Trent | 2008 |
| Airspace Music Ltd | London | 2023 |
| Airspeed (York) Limited | York | 2013 |
| Airspeeder Ltd | London | 2020 |
| AIRSTRIP1 Ltd | London | 2022 |
| Airstrong Ltd | London | 2022 |
| Airstudios Ltd | Milton Keynes | 2023 |
| Airth Highland Gathering (1999) Limited | Stirling | 1999 |
| Airtime Aerobatics Limited | Cheltenham | 2006 |
| Airtime Halifax Ltd | Halifax | 2017 |
| Airwake Ltd | Cannock | 2019 |
| Airways Gliding Club Limited | Buxton | 2018 |
| Airways Microlight Training Limited | Buxton | 2014 |
| Airways Training (Darley Moor) Limited | Derbyshire | 2006 |
| Airworks Training Limited | Lewes | 2011 |
| Airworld Aviation Museum Limited | Caernarfon | 2010 |
| Airxcite Limited | Telford | 1997 |
| Aish Audio Ltd | Southall | 2020 |
| Aish Funk Limited | London | 2024 |
| Aisha Entertainment Ltd | Doncaster | 2026 |
| AISLE44 Limited | Abingdon | 2024 |
| Aisleyne Limited | Potters Bar | 2006 |
| Aisling a Thagann Fior Ltd | Slough | 2023 |
| Aisling Ghear Theatre Company Limited | Beal Feirste | 1997 |
| Aisling Tara Productions Limited | Princes Risborough | 2015 |
| Aitch : Creative Limited | London | 2003 |
| Aitch and Aitch BEE Events Limited | Gloucester | 2015 |
| AIU Studio Ltd | Brighton | 2019 |
| Aiver Contracts Limited | Hoddesdon | 1985 |
| Aivilo Theatre Limited | Bristol | 2023 |
| AIW UK US Investors Ltd | London | 2025 |
| Aixa Amarante Productions Ltd | London | 2022 |
| AJ & MG Company Limited | Southampton | 2003 |
| AJ Arch Limited | Spalding | 2022 |
| AJ Bands Ltd | Barnoldswick | 2023 |
| AJ Coaching Ltd | Rochester | 2025 |
| AJ Creative Art Limited | Leeds | 2026 |
| AJ Cricket Ltd | London | 2023 |
| AJ Dance Centre Ltd | Grangemouth | 2018 |