Company: AWK
Filing Date: 2025-12-29
Form Type: S-4/A
Source: 0001193125-25-332292
Chunk: 422

Company: American Water Works Company, Inc.
Filing Date: 2025-12-29
Form: S-4/A
Chunk 422
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 Joint Proxy Statement/Prospectus and form of Proxy Card are available at www.proxyvote.com.

American Water will hold the Special Meeting virtually, rather than at a physical location.

You will not be able to attend the

Special Meeting in
person.

To be admitted to the Special Meeting, please access the virtual meeting platform on the Internet at
www.virtualshareholdermeeting.com/AWK2026SM. Shareholders or their legal proxies must log on to the platform by entering the 16-digit control number included on the Proxy Card. Online access to the Special Meeting will open approximately 15 minutes
prior to the start of the virtual meeting.

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V81948-S26627

AMERICAN WATER WORKS COMPANY, INC.

Special Meeting of Shareholders

February 10, 2026, 10:00 a.m., Eastern Time

This proxy is solicited on behalf of the Board of Directors

The undersigned shareholder of AMERICAN WATER WORKS COMPANY, INC., a Delaware corporation (“American
Water”), hereby appoints Karl F. Kurz and John C. Griffith, and each of them individually, as attorneys and proxies for the undersigned, each with the power to appoint his or her substitute, to act with respect to and to vote, all of the
shares of common stock of American Water which the undersigned is entitled to vote, with the powers the undersigned would possess if virtually present at American Water’s Special Meeting of Shareholders, to be held at 10:00 a.m., Eastern Time,
on February 10, 2026 via the virtual meeting website on the Internet at www.virtualshareholdermeeting.com/AWK2026SM, and any adjournment or postponement thereof (the “Special Meeting”), as directed on the reverse side, and with
discretionary authority on all other matters properly presented at the Special Meeting, all as more fully described in the Joint Proxy Statement/Prospectus received by the undersigned shareholder.

This proxy, when properly executed, will be voted in the manner directed herein. If no direction is made, this proxy will be voted “FOR” the share issuance proposal and, if presented for approval at the Special Meeting, “FOR” the American Water adjournment proposal.

The undersigned shareholder hereby rev