| Aethereon Technologies Limited | Plymouth | 2025 |
| Aetherex Ltd | London | 2024 |
| Aethergy Ltd | Lisburn | 2020 |
| Aetherhive Ltd | Rugby | 2025 |
| Aetheria Creations Ltd | Bromley | 2024 |
| Aetheria Group Ltd | Potters Bar | 2023 |
| Aetheria-X Ltd | Cambridge | 2023 |
| Aetheric Ltd | Llandrindod Wells | 2024 |
| Aetherion Energy Ltd | Bridgend | 2025 |
| Aetherion Energy Solutions Limited | Coventry | 2025 |
| Aetherion Ltd | London | 2025 |
| Aetheris London Ltd | London | 2023 |
| Aetherium Engineering Ltd | London | 2023 |
| Aetherix Technologies Ltd | London | 2024 |
| Aetherline Consultancy Limited | London | 2025 |
| Aetherline Limited | Sevenoaks | 2025 |
| Aetherlite Ltd | Ruislip | 2025 |
| Aetherna Group Ltd | London | 2026 |
| Aethir Services Ltd | London | 2025 |
| Aethlos Ltd | Preston | 2022 |
| Aethon Accountancy Limited | Bradford | 2026 |
| Aethon Partners Limited | London | 2018 |
| Aethos Capital Ltd | London | 2025 |
| Aethos Homes Limited | Liverpool | 2026 |
| Aethox Therapeutics Ltd | Brecon | 2025 |
| Aethr Associates Limited | Chichester | 2023 |
| Aethyr Labs Ltd | London | 2026 |
| Aetinq Ltd. | London | 2026 |
| Aetion UK Ltd | Reading | 2015 |
| Aetius Strategy Advisory Limited | Coventry | 2021 |
| Aetos Consulting Group Limited | Warrington | 2021 |
| Aetos Consulting Limited | London | 2008 |
| Aetosense Ltd | Ely | 2023 |
| Aetr Ltd | London | 2025 |
| Aetreum (Global) Limited | London | 2024 |
| Aetrum Ltd | London | 2026 |
| Aetsomne Limited | London | 2018 |
| AEV Design & Development Ltd | Tunbridge Wells | 2024 |
| Aev&D Ltd | Uckfield | 2025 |
| Aeva Consulting Ltd | London | 2026 |
| Aeva Ltd | Tottenham Hale | 2018 |
| Aevec Ltd | Gateshead | 2025 |
| Aeventia Limited | Harrow | 2017 |
| Aevias Ltd | England | 2018 |
| Aevim Limited | Salford | 2025 |
| Aevista Ltd | Bolton | 2025 |
| Aevitas Creative Management UK Limited | London | 2019 |
| Aevitium Ltd | London | 2023 |
| Aevo Solutions Ltd | London | 2009 |
| Aevo-Cx Ltd | Gloucester | 2026 |
| Aevori Labs Ltd | London | 2023 |
| Aevum Data Limited | Grimsby | 2015 |
| Aevum Estate Protection Ltd | Bristol | 2022 |
| Aevum Ventures Limited | Maidstone | 2022 |
| Aevura Labs UK Ltd | London | 2025 |
| AEW Architects & Designers Ltd | Manchester | 1992 |
| AEW Associates Limited | Sutton Coldfield | 2007 |
| AEW Consultancy Ltd | Lowestoft | 2014 |
| AEW Europe Holding Limited | London | 2008 |
| AEW Global Limited | London | 1999 |
| AEW Global UK Limited | London | 1992 |
| AEW People Development Limited | Leeds | 2014 |
| Aewc Limited | Pulborough | 2008 |
| Aewconsult Ltd | Stockport | 2019 |
| Aewright Limited | Colchester | 2025 |
| AEX Finance Limited | Stourbridge | 2024 |
| Aexea Ltd | London | 2015 |
| AEY Finance Ltd | London | 2019 |
| AEY Financials Limited | Deal | 2015 |
| AEY Grading Ltd | Ashington | 2025 |
| AEY Ltd | Bradford | 2016 |
| AEY Mechanical Solutions Ltd | Newcastle Upon Tyne | 2023 |
| AEY Strategic Risk Consultancy Ltd | London | 2026 |
| Aeykay Enterprises Ltd | Aylesbury | 2025 |
| Aeys Associates (UK) Ltd | Norwich | 2015 |
| AEZ Family Holdings Limited | Solihull | 2018 |
| Aeza Planning Ltd | London | 2025 |
| Aezon Ltd | London | 2025 |
| AF - Park Street Ltd | Winsford | 2023 |
| AF Accountancy Services Limited | Gravesend | 2019 |
| AF Accountants Ltd | London | 2014 |
| AF Accounting Services Limited | Welshpool | 2023 |
| AF Active Limited | Altrincham | 2018 |
| AF Advisers Limited | London | 2026 |
| AF Advisors Limited | Camberley | 2013 |
| AF Advisory Inc (UK) Ltd | London | 2017 |
| AF Architecture Ltd | Milton Keynes | 2026 |
| AF Assist Ltd | Folkestone | 2023 |
| AF Associates Accountancy Limited | London | 2021 |
| AF Associates UK Ltd | London | 2015 |
| AF Automation Ltd | Witney | 2023 |
| AF Bookkeeping Services Limited | Liverpool | 2015 |
| AF Broadgate Limited | Leeds | 2021 |
| AF Business Advisory Limited | Wembley | 2022 |
| AF Business Solutions Ltd | Willingham | 2025 |
| AF Construction Management Limited | Nottingham | 2015 |
| AF Consultancy (London) Limited | Hoddesdon | 2014 |
| AF Consultancy (Surrey) Limited | Whitehills Business Park | 2021 |
| AF Consultancy and Solutions Limited | Stratford-Upon-Avon | 2024 |
| AF Consultancy Ireland Ltd | Newry | 2019 |