Company: AWK
Filing Date: 2025-12-17
Form Type: S-4
Source: 0001193125-25-321389
Chunk: 8

Company: American Water Works Company, Inc.
Filing Date: 2025-12-17
Form: S-4
Chunk 8
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 contemplated
thereby, including the merger, and the other matters to be considered at the American Water special meeting. A summary of the merger agreement is included in the joint proxy statement/prospectus in the sections entitled “The Merger” and “The Merger Agreement,” and a copy of the merger agreement is attached as Annex A to the joint/proxy statement prospectus. We encourage you to carefully read the accompanying joint proxy statement/prospectus
(including the annexes thereto) and any other documents incorporated by reference therein in their entirety.

PLEASE VOTE YOUR SHARES PROMPTLY. YOU CAN FIND INSTRUCTIONS FOR VOTING ON THE ENCLOSED PROXY CARD OR VOTING INSTRUCTION FORM. IF YOU HAVE QUESTIONS ABOUT THE MERGER, THE SHARE ISSUANCE PROPOSAL, THE AMERICAN WATER ADJOURNMENT PROPOSAL, OR VOTING YOUR SHARES, PLEASE CONTACT:

D.F. King & Co, Inc.

28 Liberty Street, 53rd Floor

New
York, New York 10005

Shareholders may call toll free: (888) 869-7406

Banks and Brokers may call collect: (646) 582-2898

Email: AWK@dfking.com

By Order of the Board of
Directors of

American Water Works Company, Inc.

Jeffrey M.
Taylor

Vice President and Secretary

Camden, New
Jersey

[ ], 202[ ]

Essential Utilities, Inc. 762 West Lancaster Avenue Bryn Mawr, Pennsylvania 19010-3489 NOTICE OF SPECIAL MEETING OF SHAREHOLDERS TO BE HELD ON [ ], 2026 Dear Essential Utilities, Inc. Shareholder: I am pleased to notify you of, and invite you to attend, the special meeting of shareholders of Essential Utilities, Inc., which is referred to as the Essential special meeting, which will be held at [ ] Eastern time on [ ], 2026 via remote communication at www.virtualshareholdermeeting.com/WTRG2026SMto allow broad access to the Essential special meeting by Essential’s shareholders and employees. At the Essential special meeting, Essential shareholders will be asked to consider and vote on the following matters:

| 1. | a proposal to approve the merger agreement and the transactions contemplated thereby, including the merger, 
 which proposal is referred to as the merger agreement proposal;                                             |

| 2. | a proposal to approve, on a non-binding advisory basis, the