| Aegis Corporate Strategy Limited | Richmond | 1989 |
| Aegis Eagles Security Services Ltd | Huddersfield | 2021 |
| Aegis Electric & GAS International Services 6 Ltd | London | 2025 |
| Aegis Electric & GAS International Services Limited | London | 1996 |
| Aegis Energy Smithywood Ltd | London | 2026 |
| Aegis Equity Ltd | London | 2026 |
| Aegis Finance Ltd | Chatham | 2025 |
| Aegis Financial Consultants Limited | Pembrokeshire | 2001 |
| Aegis Financial Planning Limited | Ashford | 2014 |
| Aegis Financial Services Limited | Cardiff | 2024 |
| Aegis Global Legal & Arbitration Ltd | London | 2025 |
| Aegis Group of Companies Limited | Luton | 2018 |
| Aegis Holdings Ltd | Manchester | 2025 |
| Aegis Horizon Ltd | Margate | 2025 |
| Aegis International Group Limited | London | 2019 |
| Aegis Investco Limited | Stockport | 2024 |
| Aegis Life Financial Services Limited | Stanmore | 2018 |
| Aegis London Holdings Limited | London | 2012 |
| Aegis London Services Limited | London | 2009 |
| Aegis Management Limited | London | 2025 |
| Aegis Managing Agency Limited | London | 1997 |
| Aegis Rail Holdings Limited | Preston | 2020 |
| Aegis Security Solutions NW Ltd | Preston | 2026 |
| Aegis Underwriting Limited | London | 1998 |
| Aegis Vanguard Ltd | Ilford | 2025 |
| Aegis Ventures Holdings Ltd | Hexham | 2025 |
| Aegisium Ltd | London | 2025 |
| Aeglistus Holdings Limited | Spalding | 2024 |
| Aegon Asset Management Limited | Edinburgh | 2000 |
| Aegon Asset Management UK PLC | Edinburgh | 1988 |
| Aegon Investments Limited | London | 2017 |
| Aegon Sipp Guarantee Nominee Limited | London | 2014 |
| Aegon UK Investment Holdings Limited | London | 2020 |
| Aegprp Group Ltd | Bury St. Edmunds | 2024 |
| Aegros Bidco Limited | Chippenham | 2024 |
| Aegros Holdco 1 Limited | Chippenham | 2024 |
| Aegros Holdco 2 Limited | Chippenham | 2024 |
| Aegros Holdco 3 Limited | Chippenham | 2024 |
| Aegys Holdings Ltd | London | 2021 |
| Aegyz Ltd | Sutton | 2026 |
| AEH Alfreton Ltd | Alfreton | 2025 |
| AEH Asset Holdings Limited | Leicester | 2025 |
| Aeht Group Holdings Limited | Ripon | 2024 |
| AEI Holdingco Limited | Maldon | 2026 |
| AEI Holdings Limited | Hailsham | 2001 |
| AEI Management Group Limited | London | 2025 |
| AEI Music Group Limited | London | 2025 |
| Aeif Holdings Limited | London | 2019 |
| Aeif Investment 1 Holdings Limited | London | 2019 |
| Aeif Investment 1 Limited | London | 2021 |
| Aeif RF Investco Limited | London | 2022 |
| Aeight Ltd | Preston | 2014 |
| Aeit Holdings Limited | London | 2022 |
| AEJ Trading Limited | Norwich | 2025 |
| AEK Consultancy Limited | London | 2024 |
| AEK Holdings Ltd | Bognor Regis | 2025 |
| Aekw Holdings Ltd | Glasgow | 2025 |
| AEL (Garlogie) Limited | Norwich | 2025 |
| AEL Group (Northern) Limited | Newton Aycliffe | 2025 |
| AEL Group Limited | Wisbech | 2015 |
| Aelia Assurances UK Ltd | London | 2022 |
| Aelia Capital Limited | London | 2021 |
| Aeliuscircle Ltd | London | 2020 |
| Aelodea Holding Ltd | London | 2025 |
| AEM 25 Ltd | Belfast | 2025 |
| AEM Investments Limited | London | 2024 |
| AEM Ventures Ltd | Williton | 2021 |
| AEN Ventures Limited | London | 2026 |
| Aeo-Uk Limited | London | 2024 |
| Aeolos Energy Investments Ltd | Cardiff | 2021 |
| Aeon Capital Investments Limited | London | 2022 |
| Aeon Capital Limited | London | 2026 |
| Aeon Financial Group Ltd | Rotherham | 2021 |
| Aeon Financial Services Limited | Rotherham | 1996 |
| Aeon Games Holding Limited | London | 2023 |
| Aeon Group Holdings Limited | Rotherham | 2025 |
| Aeon Holdings Ltd | London | 2020 |
| Aeon Nexus Growth Partners Ltd | Northampton | 2024 |
| Aeonaptro Holdings Limited | London | 2026 |
| Aeonian Holdings Limited | Tunbridge Wells | 2020 |
| Aeonian Investments Limited | Skelmersdale | 2022 |
| Aeonic ANT Ltd | London | 2021 |
| Aep-Ii Egypt Holdco 2 Limited | London | 2024 |
| Aep-Ii Egypt Holdco I Limited | London | 2024 |
| Aep-Ii Serbia Holdco Limited | London | 2024 |
| Aep-Ii Turkey I Holdco Limited | London | 2024 |
| Aepep III Reit Limited | London | 2022 |
| Aepep IV Central London Master Limited | London | 2024 |
| Aepep IV UK Master Limited | London | 2024 |
| Aequalis Property Group Ltd. | Stourbridge | 2024 |
| Aequalis Verde IP Limited | High Wycombe | 2015 |
| Aequis Holdings Limited | Salisbury | 2025 |
| Aequitas Automotive Ltd | Birkenhead | 2010 |
| Aequitas Bidco Limited | Maidenhead | 2024 |
| Aequitas Carbon Limited | London | 2025 |
| Aequitas Estates Holdings Limited | Uxbridge | 2017 |
| Aequitas Group Holdings Ltd | Birkenhead | 2020 |
| Aequitas Holdings Limited | Uxbridge | 2024 |
| Aequitas LF UK Ltd | Tonbridge | 2025 |
| Aequitas Research UK Limited | London | 2025 |