AECOM

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment No. )

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Preliminary Proxy Statement

Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

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Definitive Proxy Statement

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Soliciting Material under §240.14a-12

AECOM

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Dear AECOM Stockholder:

You are cordially invited to attend the 2026 Annual Meeting of Stockholders (the “2026 Annual Meeting”) of AECOM, which

will be held on Tuesday, March 3, 2026, at 3:00 p.m. Central Time.

The 2026 Annual Meeting will be a completely virtual meeting, conducted via live webcast. The virtual meeting format allows

all of our stockholders the opportunity to participate in the annual meeting no matter where they are located. You will be able

to attend the annual meeting, vote, and submit questions during the meeting by visitingwww.meetnow.global/MJCU4RZ.

Further information regarding attendance, including how to access the virtual meeting, is set forth in the “Attending the

Virtual Annual Meeting” section of the attached Proxy Statement.

Details of the business to be conducted at the 2026 Annual Meeting are given in the attached Notice of Annual Meeting of

Stockholders and the attached Proxy Statement.

Whether or not you plan to attend the 2026 Annual Meeting, it is important that your shares be represented. The attached

Proxy Statement contains details about how you may vote your shares.

Sincerely,

Troy Rudd

Chairman and Chief Executive Officer

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

TO BE HELD ONMARCH 3, 2026

The 2026 Annual Meeting of Stockholders (the “2026 Annual Meeting”) of AECOM (the “Company,” “our” or “we”) will be held

on Tuesday, March 3, 2026, at 3:00 p.m. Central Time, virtually by live webcast. You will be able to attend the annual

meeting, vote, and submit questions during the meeting by visitingwww.meetnow.global/MJCU4RZ. At the 2026 Annual

Meeting, you will be asked to:

1. Elect each of the 8 director nominees named in the Proxy Statement accompanying this notice to the Company’s

Board of Directors to serve until the Company’s 2027 Annual Meeting of Stockholders.

The Board of Directors recommends that you vote FOR each of the director nominees.

2. Ratify the selection of Ernst & Young LLP as our independent registered public accounting firm for fiscal year

The Board of Directors recommends that you vote FOR the ratification of the selection of Ernst & Young

LLP.

3. Vote to approve the Company’s executive compensation, on an advisory basis.

The Board of Directors recommends that you vote FOR the Company’s executive compensation on an

advisory basis.

We will also attend to any other business properly presented at the 2026 Annual Meeting. The foregoing items of business

are more fully described in the Proxy Statement that is attached to, and a part of, this notice.

Only common stockholders of record at the close of business on January 9, 2026 can vote at the 2026 Annual Meeting or

any adjournment or postponement thereof. A complete list of such stockholders will be open to the examination of any

stockholder for a purpose germane to the meeting for a period of ten days ending on the day before the Annual Meeting at

the Company’s principal place of business, located at 13355 Noel Road, Suite 400, Dallas, Texas 75240. The Annual

Meeting may be continued or adjourned from time to time without notice other than by announcement at the Annual Meeting.

By order of the Board of Directors,

Manav Kumar

Corporate Secretary

Dallas, Texas

January 20, 2026

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