| Aesculetum Investments Limited | London | 2023 |
| Aesir Space Limited | Uckfield | 2025 |
| Aesir Wealth Ltd | Wolverhampton | 2016 |
| Aesn Holdings Ltd | Hayes | 2025 |
| Aesop Bidco Limited | Altrincham | 2024 |
| Aesop Holdco Limited | Altrincham | 2024 |
| Aesora Limited | Wolverhampton | 2024 |
| Aestas Limited | Whitstable | 2019 |
| Aesthelis Limited | Northampton | 2018 |
| Aesthetic 001 Ltd | Bicester | 2023 |
| Aesthetic Equity Partners Limited | Maidenhead | 2025 |
| Aesthetic Growth Solutions Ltd | Manchester | 2025 |
| Aesthetic Holdings Limited | Maidenhead | 2019 |
| Aesthetic Homes Group Limited | Farnham | 2015 |
| Aesthetic Plastic Surgery UK Ltd | Pinner | 2011 |
| Aesthetic Resolution Holdings Limited | Maidenhead | 2025 |
| Aesthetic Software Holding Limited | Birmingham | 2026 |
| Aesthetic Source Holdings Limited | Bedford | 2024 |
| Aesthetic World Holdings Limited | London | 2008 |
| Aesthetically Insured Limited | Chester | 2024 |
| Aesthetics Event Staff Holdings Ltd. | Newcastle Upon Tyne | 2022 |
| Aesthetics Holdings Limited | Belfast | 2024 |
| Aesx Limited | Farnborough | 2005 |
| AET Group Holdings Limited | East Grinstead | 2024 |
| AET Mining International Ltd | London | 2021 |
| AET Transport Group Limited | Poole | 2017 |
| Aetas Global Ltd | Redruth | 2026 |
| Aete Limited | | 1991 |
| Aeterna Group Holdings Ltd | London | 2021 |
| Aeterna Group Ltd | London | 2025 |
| Aeterna Holdings Limited | Swatragh | 2021 |
| Aeternitas International Ltd | Cambridge | 2025 |
| Aeternum Capital Ltd | London | 2026 |
| Aeternum Cornell Ltd | Tring | 2025 |
| Aeternum Investments Limited | London | 2026 |
| Aeternus Associates Limited | Downham Market | 2024 |
| Aeternus Capital Group Ltd | London | 2026 |
| Aeternus Group Ltd | London | 2023 |
| Aeternus Holding Ltd | Bromley | 2025 |
| Aetha Design Holdings Ltd | Poole | 2022 |
| Aethel Energy Limited | London | 2026 |
| Aethel Group Limited | London | 2025 |
| Aethel Healthcare Limited | London | 2016 |
| Aethel Industries Limited | London | 2024 |
| Aethel Mining Portugal Limited | London | 2012 |
| Aethel Real Estate Limited | London | 2020 |
| Aethel Sports Limited | London | 2025 |
| Aethel Sports Portugal Limited | London | 2025 |
| Aethel V Limited | London | 2025 |
| Aether Access Ltd | London | 2025 |
| Aether Assets Management Ltd | London | 2024 |
| Aether Capital Partners Ltd | London | 2024 |
| Aether Energy Limited | London | 2010 |
| Aether Gardens Ltd | Castleford | 2024 |
| Aether IOS Limited | London | 2010 |
| Aether Medical Gases Holding Company Limited | Canterbury | 2020 |
| Aether Ventures Ltd | Manchester | 2025 |
| Aetheri Limited | London | 2022 |
| Aetherion Holdings Limited | Coventry | 2026 |
| Aetheris Capital Ltd | London | 2026 |
| Aetheris Technology Ltd. | Cardiff | 2025 |
| Aethern Integrated Infrastructure UK Ltd | Coventry | 2025 |
| Aethos U.K. Limited | Waterbeach | 2024 |
| Aethrion Limited | London | 2017 |
| Aetia Ltd | London | 2009 |
| Aetios Holdings UK Limited | London | 2022 |
| Aetna Global Benefits (UK) Limited | Birmingham | 1998 |
| Aetna Investments Limited | London | 2024 |
| Aetna Investments Management Limited | London | 2025 |
| Aetos Associates Limited | Rugby | 2018 |
| Aetos Capital Ltd | London | 2017 |
| Aetreum Holding Limited | London | 2021 |
| Aetreum Louth Limited | London | 2022 |
| Aetreum Risk Management Limited | London | 2019 |
| AEU Financial Services Limited | Prescot | 2026 |
| AEV Holdings Limited | Birkenhead | 2007 |
| Aevans Financial Services Ltd | Burton-On-Trent | 2011 |
| Aevian Holdings Limited | Cheadle | 2026 |
| Aevisa Holdings Ltd | Maidstone | 2026 |
| Aevitas Wealth Ltd | Bridgend | 2015 |
| Aevum Group Ltd | Croydon | 2026 |
| Aevum Holdings Ltd | London | 2025 |
| Aevus Partners Limited | London | 2020 |
| AEW Holdings Limited | Witham | 2019 |
| AEW Lerouge Limited | Coventry | 2025 |
| AEW UK Reit PLC | London | 2015 |
| AEW Ventures Limited | Manchester | 2020 |
| AEX Consultancy Limited | Smethwick | 2015 |
| Aexea Capital Ltd | London | 2017 |
| AEY Holdings Ltd | London | 2020 |
| AEY Investco Limited | Manchester | 2020 |
| AF & Associates Ltd | London | 2019 |
| AF & L Ltd | Warrington | 2018 |
| AF (U.K) Ltd | London | 2022 |
| AF Advisory (Holdings) Limited | London | 2015 |
| AF Carr Holdings Group Limited | London | 2023 |
| AF Carr Holdings Ltd | London | 2017 |
| AF Claxton Holding Limited | Great Yarmouth | 2026 |
| AF Financial & Accounting Services Limited | London | 2018 |
| AF Financial Consultants Ltd | Cannock | 2019 |