AECOM, together with its subsidiaries, engages in designing, building, financing, and operating infrastructure assets worldwide. It operates through four segments: Design and Consulting Services (DCS), Construction Services (CS), Management Services (MS), and AECOM Capital (ACAP). The DCS segment offers planning, consulting, architectural and engineering design, program management, and construction management services for industrial, commercial, institutional, and government clients, including the transportation, facilities, environmental, energy, and water markets. The CS segment provides building construction and energy, as well as infrastructure and industrial construction services. The MS segment offers program and facilities management and maintenance, training, logistics, consulting, technical assistance, and systems integration and information technology services primarily for agencies of the United States government and other national governments.

The ACAP segment invests in and develops real estate, public-private partnership, and infrastructure projects. The company was formerly known as AECOM Technology Corporation and changed its name to AECOM in January 2015. AECOM was founded in 1980 and is headquartered in Los Angeles, California.