| Airspace Limited | Alnwick | 2025 |
| Airspaces Events Limited | Wallingford | 2020 |
| Airspares Limited | High Wycombe | 2007 |
| Airstream Rentals Ltd | King'S Lynn | 2008 |
| Airsystems Couriers Limited | South Croydon | 2014 |
| Airtab Limited | Burnley | 2011 |
| Airtec Air Conditioning Limited | East Grinstead | 2015 |
| Airtec Air Conditioning Services Limited | East Grinstead | 2015 |
| Airtech Air Conditioning & Climate Control Limited | East Grinstead | 2015 |
| Airtech Air Conditioning Limited | East Grinstead | 2015 |
| Airtech Building Services Limited | East Grinstead | 2015 |
| Airtech Commissioning Trustee Company Limited | Birmingham | 2025 |
| Airtech Controls Trustee Company Limited | Birmingham | 2020 |
| Airtech Environmental Limited | East Grinstead | 2015 |
| Airtech Environmental Services Limited | East Grinstead | 2015 |
| Airtech Facilities Management Limited | East Grinstead | 2015 |
| Airtech FM Limited | East Grinstead | 2015 |
| Airtech Heating Limited | East Grinstead | 2015 |
| Airtech Installations Limited | East Grinstead | 2015 |
| Airtech Mechanical Services Limited | East Grinstead | 2015 |
| Airtech Services Limited | East Grinstead | 2015 |
| Airtech Yachting Ltd | Blackpool | 2024 |
| Airteck Limited | East Grinstead | 2019 |
| Airtemp Air Conditioning Ltd | St. Leonards-On-Sea | 2006 |
| Airtemp Service Ltd | St. Leonards-On-Sea | 2006 |
| Airtight Fire & Security Systems Limited | Hailsham | 2010 |
| Airtight Sealant Process Limited | Liverpool | 2008 |
| Airtight Solutions Limited | Liverpool | 2008 |
| Airtools Limited | Preston | 2002 |
| Airtrade Ltd | Stratford-Upon-Avon | 2014 |
| Airtrust Limited | Kingswinford | 1991 |
| Airvailability Limited | Saffron Walden | 2020 |
| Airvertise Limited | Pontefract | 2010 |
| Airware Limited | Stratford-Upon-Avon | 2015 |
| Airways Airsports Limited | Buxton | 2014 |
| Airworthiness Assured Limited | Nottingham | 2011 |
| AIS Insulation Supplies Limited | Sheffield | 2004 |
| AIS Integrated Services Ltd | Wigan | 1981 |
| Aisar Ltd | Edinburgh | 2010 |
| Aishaesthetics Ltd | Bradford | 2021 |
| Aisimo Corporation Co., Ltd | Beckenham | 2013 |
| Aisling School of Irish Dance Limited | Belfast | 2022 |
| Aiso Ltd | Manchester | 2019 |
| Aisthorpe 1967 Limited | Sheffield | 2014 |
| Aisyng Consulting Ltd | London | 2024 |
| AIT Group Limited | London | 2025 |
| AIT Logistics Ltd | Northampton | 2020 |
| Aitanna Ltd | London | 2021 |
| Aitch KAY Limited | Bedford | 2015 |
| Aitkin Limited | Harrogate | 2024 |
| Aitt Ltd | London | 2024 |
| Aivaraslag Ltd | Cardiff | 2025 |
| Aivgo Limited | Worthing | 2012 |
| Aivisonas Transport Ltd | St. Neots | 2015 |
| Aixcll Ltd | Cheltenham | 2026 |
| Aiyize Limited | Beckenham | 2023 |
| Aiyoupu (Australia) Crop Protect Ltd | Cardiff | 2020 |
| Aizlewood & Casson Flooring Limited | Sheffield | 2017 |
| AJ & Sons (UK) Limited | Nottingham | 2012 |
| AJ Amor Ltd | Corby | 2023 |
| AJ Bell EBT Limited | Salford Quays | 2012 |
| AJ Bell Sippdeal Limited | Salford Quays | 2008 |
| AJ Foale Limited | London | 2011 |
| AJ Happylife Ltd | Manchester | 2025 |
| AJ Holdco Limited | Kidlington | 2020 |
| AJ Knitting Co., Ltd | Beckenham | 2018 |
| AJ Korklin Limited | Coventry | 2016 |
| AJ Perrin Associates Limited | Farnham | 2013 |
| AJ Pountain Limited | Uttoxeter | 2009 |
| AJ Traders Ltd | Cardiff | 2017 |
| Aj's 1968 Limited | Northampton | 2014 |
| Aj's Cutz Ltd | Tring | 2025 |
| Aj's Ĺuxe Findings Ltd | London | 2020 |
| Aj-Firmj Import and Export Co., Limited | London | 2023 |
| AJ3D Limited | Sharrow Vale Road, Sheffield | 2002 |
| AJA EOT Limited | Norwich | 2024 |
| Ajaws Smiles Limited | Cardiff | 2024 |
| Ajay Singh Bhatoa Ltd | Birmingham | 2024 |
| Ajaz Ahmed Shafi Ltd | Preston | 2022 |
| AJC Haulage Ltd | Walsall | 2023 |
| AJC Import & Export Co., Limited | London | 2021 |
| Ajcj Ltd | London | 2019 |
| AJD Studios (Licensed Trade Nominees) Limited | Clarkston | 2012 |
| AJE Accountants Ltd | Henley | 2017 |
| AJE Electrical Services Ltd | Bristol | 2013 |
| AJE Solutions Ltd | London | 2015 |
| Ajep Ltd | London | 2024 |
| AJF Care Solutions Limited | Sittingbourne | 2016 |
| AJH Building & Property Ltd | Bolton | 2024 |
| AJH Kenmare Limited | Leeds | 2010 |
| AJH Services Ltd | Barry | 2019 |
| AJK Services Group Limited | Watford | 2016 |
| AJL Maintenance Ltd | London | 2024 |
| AJL Stone Sales Ltd | Shipley | 2022 |
| AJM Limited | Evesham | 2023 |
| Ajmaer Singh Ltd | Birmingham | 2024 |
| Ajmal Agro Tech (UK) Limited | Oxted | 1997 |
| Ajmal Fragrances & Fashions (UK) Limited | Oxted | 1997 |
| Ajmal Holdings & Investments (UK) Limited | Oxted | 1997 |
| Ajmere Limited | Bedford | 2012 |