NYSE-listed infrastructure consulting firm that became an independent company in 1990 from Ashland Oil entities, headquartered in Dallas since relocating from Los Angeles in 2021.

AECOM became an independent company in 1990 when five entities formerly under Ashland Oil merged, and was officially named AECOM Technology Corporation until 2015. It is listed on the New York Stock Exchange (ACM), announced in August 2021 that it would move its global headquarters from Los Angeles to Dallas, and is led by CEO Troy Rudd. It provides planning, design, engineering and construction management services for transportation, water, energy and building projects, and reported about US$16.1 billion in revenue for fiscal 2025 with around 51,000 employees.