X0508 4 2025-12-15 0 0000868857 AECOM ACM 0001723099 Poloni Lara C/O AECOM 13355 NOEL RD, SUITE 400 DALLAS TX 75240 0 1 0 0 PRESIDENT 1 Common Stock 2025-12-15 4 M 0 10040 0 A 140231 D Common Stock 2025-12-15 4 A 0 16334 0 A 156565 D Common Stock 2025-12-15 4 A 0 23615 0 A 180180 D Common Stock 2025-12-15 4 F 0 13425 97.96 D 166755 D Common Stock 2025-12-17 4 S 0 17340 97.01 D 149415 D Common Stock 2025-12-17 4 S 0 193 98.35 D 149222 D Common Stock 108.13 I by Merrill Lynch under AECOM Retirement & Savings Plan (RSP) Restricted Stock Units 2025-12-15 4 M 0 10040 D Common Stock 10040 0 D Each restricted stock unit represents a contingent right to receive, upon vesting, one share of the Issuer's common stock. These restricted stock units were granted on December 15, 2022, and vested in full on December 15, 2025. Represents annual grant of restricted stock units. Each restricted stock unit represents a contingent right to receive, upon vesting, one share of the Issuer's common stock in accordance with the Issuer's 2020 Stock Incentive Plan. The restricted stock units vest in full on December 15, 2028, subject to continued service through the vesting date. Represents shares acquired pursuant to AECOM's Performance Earnings Program under the 2020 Stock Incentive Plan. Represents shares of common stock withheld by the Issuer to satisfy certain tax withholding obligations in connection with the vesting of the restricted stock units and shares acquired under the Performance Earnings Program. The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 11, 2025. The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $98.35 to $98.48. The Reporting Person undertakes to provide to the Issuer, any security holder, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range noted in this footnote. The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 11, 2025. Matt Benson, Attorney-in-Fact for Lara Poloni 2025-12-17