| AE Walker Consulting Ltd | Consett | 2021 |
| Ae&A Ltd | Hainault | 2025 |
| Ae&I Limited | Aberdeen | 2017 |
| Ae&Jo Ltd | Birmingham | 2023 |
| Ae&O Ltd | East Molesey | 2025 |
| AE3 Media Ltd. | Bromsgrove | 2014 |
| AE43 Limited | Birmingham | 2017 |
| AE61 Surveying Limited | Stockport | 2025 |
| AEA Commercial Limited | Hailsham | 2016 |
| AEA Connect Ltd | London | 2024 |
| AEA Consultancy Ltd | Wickford | 2025 |
| AEA Consulting Limited | Mildenhall | 2009 |
| AEA Consulting Services Limited | London | 2018 |
| AEA Consulting Worldwide Ltd | London | 2013 |
| AEA Contracts Ltd | Glasgow | 2025 |
| AEA Fordyce Ltd | London | 2026 |
| AEA Growth Ltd | Kettering | 2025 |
| Aeag Ltd | London | 2020 |
| Aeak Consulting Limited | Stourport-On-Severn | 2026 |
| Aeams Europe Ltd | Liverpool | 2014 |
| Aeardis Limited | Belfast | 2022 |
| Aearyl Limited | London | 2004 |
| AEB (UK) Limited | Malpas | 2009 |
| AEB Architecture & Design Ltd | Hull | 2017 |
| AEB Associates Limited | London | 2014 |
| AEB BI Limited | Whitchurch | 2023 |
| AEB Creative Ltd | Walthamstow | 2015 |
| AEB Design Ltd | London | 2021 |
| AEB Engineering Ltd | Faringdon | 2019 |
| AEB Media Ltd | Welwyn | 2021 |
| AEB Optimum Management Ltd | Lytham St. Annes | 2010 |
| AEB Research & Marketing Limited | London | 2022 |
| AEB Scotland Limited | Bonnyrigg | 2016 |
| AEB Studios Ltd | Sowerby Bridge | 2023 |
| Aebell Limited | Halifax | 2010 |
| AEC Advice Limited | Wilmslow | 2021 |
| AEC BIM Ltd | London | 2024 |
| AEC Consulting Services Ltd | London | 2017 |
| AEC Drones Limited | South Shields | 2020 |
| AEC Engineering & Trading UK Limited | London | 2024 |
| AEC Holdings & Systems Ltd | Walsall | 2026 |
| AEC Holdings Ltd | Horsham | 2018 |
| AEC Invest Ltd | Edgware | 2021 |
| AEC Marketing Limited | Leicestershire | 2005 |
| AEC Photography Limited | Crediton | 2019 |
| AEC Services UK Limited | Bristol | 2007 |
| AEC Wells Limited | Ellon | 2012 |
| Aeca Consulting Limited | Sevenoaks | 2015 |
| Aeca Ltd | London | 2018 |
| Aecare Ltd | Warrington | 2022 |
| Aecc Project Consultancy Ltd | Londonderry | 2020 |
| Aecco Engineering Consultancy Limited | Surbiton | 2016 |
| Aecentus Limited | Dungannon | 2013 |
| Aecer Ltd | Whitchurch | 2015 |
| Aecern Coaching Limited | Stockport | 2012 |
| Aechelonia Limited | London | 2024 |
| Aeclinicalservices Ltd | Dalkeith | 2024 |
| Aecms Ltd | Manchester | 2023 |
| Aecogen Technologies Ltd | London | 2015 |
| Aecom Corporation Holdings (UK) Limited | London | 1995 |
| Aecom Design & Consulting Services UK Limited | London | 2011 |
| Aecom Design Build Limited | London | 1992 |
| Aecom Environmental Solutions Limited | London | 2013 |
| Aecom Europe Holdings Limited | London | 2008 |
| Aecom GHC1 Limited | London | 2015 |
| Aecom Global Holdings UK Limited | London | 2009 |
| Aecom GR1 Limited | London | 2013 |
| Aecom GR2 Limited | London | 2013 |
| Aecom HC1 Limited | London | 2015 |
| Aecom Holdings Limited | London | 1999 |
| Aecom Infrastructure & Environment UK Limited | London | 1966 |
| Aecom Limited | London | 1984 |
| Aecom Technology Corporation Limited | Reading | 2025 |
| Aecom UKHOLDCO1 Limited | London | 2015 |
| Aecom Ukrc Limited | London | 2018 |
| Aecon (UK) Limited | Epsom | 2013 |
| Aecs Engineering Ltd | Stockton-On-Tees | 2025 |
| Aecs Gray Engineering Ltd. | Aberdeen | 2007 |
| Aecsc Limited | Nottingham | 2022 |
| Aecus Recruitment Ltd | Stafford | 2019 |
| Aecw Business Consultants Ltd | Glossop | 2024 |
| AED - Authorising Engineer & Design Limited | London | 2014 |
| AED Adjusting Limited | Bromborough | 2017 |
| AED Consult Ltd | London | 2018 |
| AED Consultancy Limited | Banstead | 2009 |
| AED Consultant Services Ltd | Clydebank | 2020 |
| AED Consulting Ltd | Faversham | 2013 |
| AED Corporation Ltd | Ruislip, | 2025 |
| AED Energy Ltd | London | 2022 |
| AED Ltd | Rochdale | 2013 |
| AED Transformation and Consulting Limited | Huddersfield | 2016 |
| AED Words Ltd | Harrow | 2015 |
| Aeda Corp Limited | London | 2025 |
| Aedaley Ltd | Ellesmere Port | 2023 |
| Aedas Interiors London Limited | London | 2010 |
| Aedas London Limited | London | 2009 |
| Aedas UK Limited | Richmond | 2023 |
| Aedc Capital Limited | London | 2016 |
| Aedea Ltd | Bath | 2023 |
| Aeden Consult Ltd | Doncaster | 2016 |