AECOM (/eɪ.iːˈkɒm/ US dict: ā·ē·kŏm') (formerly known as AECOM Technology Corporation) is a global provider of professional technical and management support services to a broad range of markets, including transportation, facilities, environmental, energy, water and government.AECOM has approximately 100,000 employees, and is currently listed at #322 on the Fortune 500 list (before URS merge).