Exhibit 99.1 Press Release Investor Contact: Media Contact: Will Gabrielski Brendan Ranson-Walsh Senior Vice President, Finance, Senior Vice President, Global Communications Treasurer 213.996.2367 213.593.8208 Brendan.Ranson-Walsh@aecom.com William.Gabrielski@aecom.com AECOM reports second quarter fiscal 2024 results · Delivered strong second quarter and first half financial performance · Increased financial guidance based on year-to-date operational outperformance and confidence in the second half of the y ...