| AEC PA Solutions Ltd | Glasgow | 2023 |
| AEC Protection Security Ltd | Romsey | 2024 |
| AEC Recruitment Ltd | Southampton | 2025 |
| AEC Technology UK Limited | Orpington | 2026 |
| Aeccp Limited | Rushden | 2016 |
| Aecea Landscapes Limited | Cambridge | 2013 |
| Aeco Global Limited | Birmingham | 2020 |
| Aecom Global Group Limited | London | 1990 |
| Aecon Design Ltd | Bolton | 2025 |
| Aecoplan Integrated Project Services Ltd | Milton Keynes | 2023 |
| Aecoplan Limited | Milton Keynes | 2014 |
| Aecotim Design Limited | Warrington | 2023 |
| Aecr UK Investment I Limited | Glasgow | 2019 |
| Aecs Connections Limited | London | 2017 |
| AED5 Ltd | Ferndown | 2023 |
| Aeda Services Ltd | Basildon | 2025 |
| Aedc Ltd | Rhyl | 2005 |
| Aedifica UK (Ampthill) Limited | London | 2018 |
| Aedifica UK (Hailsham) Limited | London | 2018 |
| Aedifica UK (Whitechapel) Limited | London | 2018 |
| Aedificus Limited | London | 2017 |
| Aedis Consultancy Limited | Chatham | 2022 |
| Aedis Partners Ltd | London | 2026 |
| Aedis Security Systems Ltd | Barnet | 2016 |
| Aedēs Stays Ltd | London | 2024 |
| Aeep Ltd | Huddersfield | 2017 |
| AEF Security Services Ltd | Aldershot | 2024 |
| AEF Services Ltd | Romney Marsh | 2018 |
| AEF Window Cleaning Limited | Pulborough | 2024 |
| Aefifty Ltd | Guildford | 2005 |
| Aefm Limited | Fleet | 2009 |
| AEG (UK) Ltd | Swindon | 2008 |
| AEG Cleaning Services Ltd | Canary Wharf | 2021 |
| AEG Pack Ltd | Blackburn | 2021 |
| AEG Presents Ltd | London | 2005 |
| AEG Travel Ltd | London | 2025 |
| Aega Marketing Limited | Westerham | 2018 |
| Aegean Breeze Ltd | Boston | 2023 |
| Aegean Cleaning Services Ltd | Southampton | 2021 |
| Aegean Island Holidays Limited | London | 2024 |
| Aegeria Procurement Ltd | Milton Keynes | 2019 |
| Aegeus Protection Ltd | Manchester | 2021 |
| Aegidius Solutions Limited | Aylesbury | 2024 |
| Aegilops Limited | London | 2019 |
| Aegios Health Ltd | Bedford | 2019 |
| Aegis Aerial Security Ltd | Emsworth | 2026 |
| Aegis Aftercare Limited | East Grinstead | 2006 |
| Aegis Amyna Limited | Gloucester | 2020 |
| Aegis Blue Limited | Torquay | 2024 |
| Aegis Cleaning Ltd | Cardiff | 2025 |
| Aegis Cleaning Service Ltd | Amble | 2019 |
| Aegis Cleaning Solutions BCP Ltd | London | 2022 |
| Aegis Close Protection Ltd | Fleetwood | 2026 |
| Aegis Collective Limited | Birmingham | 2024 |
| Aegis Commercial Services Ltd | Glasgow | 2026 |
| Aegis Conglomerate Limited | Cardiff | 2001 |
| Aegis Contracting Ltd | Chelmsford | 2024 |
| Aegis Contractor Solutions Ltd | London | 2026 |
| Aegis Crest Protection Ltd | Sutton Coldfield | 2026 |
| Aegis Crowd Safety Limited | Preston | 2026 |
| Aegis Data Consulting Ltd | Bishop'S Stortford | 2025 |
| Aegis Defence Services Limited | London | 2002 |
| Aegis Elite Solutions Ltd | Mildenhall | 2024 |
| Aegis Executive Protection Ltd | London | 2026 |
| Aegis Fire Services Ltd | Bridlington | 2023 |
| Aegis FM Ltd | Plymouth | 2019 |
| Aegis Health Group Ltd | London | 2026 |
| Aegis Healthcare Services Ltd | Barnet | 2019 |
| Aegis Integrated Security Limited | St Osyth | 2003 |
| Aegis Integrated Security Solutions Ltd | London | 2017 |
| Aegis Medicare Limited | London | 2022 |
| Aegis Outsourcing UK Limited | Harrow | 2006 |
| Aegis Paramount Ltd | Warboys | 2022 |
| Aegis Parking Control Ltd | Luton | 2022 |
| Aegis Peace Fund | Nottingham | 2024 |
| Aegis Personal Protection Ltd | Oakham | 2025 |
| Aegis Prime Security Limited | Ilford | 2026 |
| Aegis Protection Group Ltd | London | 2026 |
| Aegis Protection Security Ltd | Luton | 2025 |
| Aegis Rail Limited | Eastbourne | 2006 |
| Aegis Recruitment Ltd | London | 2025 |
| Aegis Risk Management Ltd | Kettering | 2022 |
| Aegis Safeguarding Services Ltd | London | 2022 |
| Aegis Search Ltd | Crowthorne | 2024 |
| Aegis Secure UK Ltd | London | 2024 |
| Aegis Securities Limited | Loughton | 2021 |
| Aegis Security & Protection Services Ltd | Cinderford | 2023 |
| Aegis Security Consultants Limited | Ascot | 2021 |
| Aegis Security Limited | Newport | 2014 |
| Aegis Security Services Ltd | Luton | 2022 |
| Aegis Security Support Ltd | Salisbury | 2015 |
| Aegis Service and Aftercare Ltd | Newark | 2009 |
| Aegis Shield Company Limited | London | 2012 |
| Aegis South Coast Ltd | Salisbury | 2023 |
| Aegis Support Services Limited | Luton | 2021 |
| Aegis Talent Ltd | Hampton | 2023 |
| Aegis Technologies (South) Limited | Coventry | 2023 |
| Aegis Technologies Limited | Newark | 2003 |
| Aegis UK - Recruiting and Consulting Ltd | London | 2016 |
| Aegis Vitae Holding Limited | London | 2025 |