| Adwent Holdings Limited | Kidlington | 2021 |
| Adwin Holdings Limited | West Bromwich | 2021 |
| Adwm (2025) Ltd | Bromley | 2025 |
| Adxba Group Limited | Stalybridge | 2021 |
| ADY Enterprises Ltd | Dungannon | 2021 |
| Adya Group Ltd | Maidenhead | 2020 |
| Adyen UK Limited | London | 2012 |
| Adyton Limited | London | 2024 |
| ADZ Holdings Limited | Hyde | 2021 |
| Adzzip Ltd | Chippenham | 2019 |
| AE & DH Jenkins Limited | Wallingford | 2021 |
| AE & SL Holdings Limited | Birkenhead | 2026 |
| AE Auto Enrolment Limited | Birmingham | 2014 |
| AE Baxter Holdings Ltd | Portsmouth | 2019 |
| AE Bidco Ltd | Clydebank | 2026 |
| AE China Holdings Limited | Aylesford | 2026 |
| AE China Ltd | Aylesford | 2026 |
| AE Financial Limited | Witney | 2023 |
| AE Financial Services Limited | Waterlooville | 1998 |
| AE Financial Wealth Ltd | Motherwell | 2025 |
| AE Group Holdings Limited | Southam | 2023 |
| AE Insurance Brokers Limited | Romsey | 1982 |
| AE International Limited | Manchester | 1956 |
| AE Investment Holdings Ltd | Hertford | 2026 |
| AE London Limited | London | 2024 |
| AE Ownership Company Limited | London | 2021 |
| AE Premier Holdings | Sheffield | 2020 |
| AE Services Continuation Ltd | London | 2003 |
| AE SPV 1 Ltd | London | 2025 |
| AE UK Holdings Limited | Tamworth | 2017 |
| AE Wealth Ltd | Eastbourne | 2024 |
| AE Wealth Management Ltd | Barking | 2020 |
| Ae&Ae Ltd | Cambridge | 2015 |
| AE2 Group Ltd | London | 2025 |
| AEA Financial Services Ltd | Dungannon | 2026 |
| AEA Investors Management (UK) Ltd | London | 1999 |
| AEB Financial Limited | Brentford | 2025 |
| AEB Holdings Ltd | Barrow In Furness | 2025 |
| AEB Shareholdings Limited | Walton-On-Thames | 2024 |
| Aebensoncornerstone Limited | London | 2023 |
| AEC 1 Limited | Grays | 2024 |
| AEC 2 Limited | Grays | 2024 |
| AEC 4 Limited | Grays | 2024 |
| AEC 5 Limited | Grays | 2024 |
| AEC Accounting & Training Experts and Consulting Ltd | London | 2023 |
| AEC Construction Group (Holdings) Limited | Plymouth | 2026 |
| AEC Construction Holdings Limited | Plymouth | 2026 |
| AEC Consultancy Limited | Manchester | 2025 |
| AEC Manufacturing Ltd | West Byfleet | 2019 |
| Aeclipse Ltd | Chester | 2014 |
| Aecm Nominees Limited | Milton Keynes | 2020 |
| Aecom Intercontinental Holdings UK Limited | London | 2012 |
| Aecom Pension Trustee Limited | London | 2015 |
| Aecom SWH1 Limited | London | 2025 |
| Aecom SWH2 Limited | London | 2025 |
| Aecom Worldwide Holdings UK Limited | London | 2012 |
| Aecus Partners UK Ltd | Twickenham | 2025 |
| AED Finance 1 Limited | London | 2019 |
| AED Finance 2 Limited | London | 2019 |
| AED Group Holdings Limited | Bromborough | 2017 |
| AED Roller Group Holdings Limited | Brierley Hill | 2024 |
| AED UK Holdings Limited | London | 2024 |
| Aedes Holdings Ltd | London | 2025 |
| Aedes Limited | Glasgow | 1956 |
| Aedifica UK (Marston) Limited | London | 2021 |
| Aedifica UK (Shrewsbury) Limited | London | 2009 |
| Aedifica UK Limited | London | 2019 |
| Aedificium Capital Holdings Limited | London | 2021 |
| Aedis Warranties Ltd | Birmingham | 2014 |
| Aedk Holdings Ltd | Leeds | 2023 |
| Aedos Capital Partners Ltd | Burnley | 2019 |
| Aedos Limited | Christchurch | 2009 |
| Aedul Ltd | London | 2025 |
| AEE Holdings Ltd | Manchester | 2025 |
| AEF (Malton) Limited | York | 2011 |
| AEF Group Limited | Leamington Spa | 2023 |
| AEG 1440 Holdings Ltd | Stockport | 2021 |
| AEG Capital Ltd | London | 2025 |
| AEG GRC Limited | London | 2024 |
| AEG Mortgages Limited | London | 2017 |
| AEG Operations Ltd | Stockport | 2025 |
| AEG Private Ltd | Stockport | 2025 |
| Aegaea Holdings Limited | Bury St. Edmunds | 2023 |
| Aegean Advisory Ltd | London | 2017 |
| Aegean Bidco Limited | London | 2022 |
| Aegean Blue Ltd | Grange-Over-Sands | 2005 |
| Aegean Holdco Limited | London | 2026 |
| Aegean Holdings Ltd | Finchley | 2022 |
| Aegeus Capital Limited | Maidstone | 2016 |
| Aegf 2 Ltd | Tenbury Wells | 2006 |
| Aegi Holdings Limited | Newcastle Upon Tyne | 2025 |
| Aegila Capital Management Limited | London | 2015 |
| Aegirmist Holdco Limited | London, | 2026 |
| Aegirmist Investco Limited | London | 2026 |
| Aegis & Trident Capital Limited | Potters Bar | 2021 |
| Aegis Asset Finance Holdings Ltd. | London | 2017 |
| Aegis Capital Group Limited | London | 2026 |
| Aegis Capital Holdings Ltd | London | 2025 |
| Aegis Capital Partners Limited | Cambridge | 2025 |
| Aegis Corporate Holdings Limited | Bromborough | 2026 |