Form of Proxy

The Merger Agreement Proposal: Approval of the Agreement and Plan of Merger, dated as of October 26, 2025, by and among American Water Works Company, Inc., Alpha Merger Sub, Inc. and Essential Utilities, Inc., as may be amended, restated, or otherwise modified from time to time (the Merger Agreement), and the transactions contemplated thereby, including the merger.

Merger-Related Compensation Proposal: Approval, on a non-binding advisory basis, of the compensation that may be paid or become payable to the named executive officers of Essential Utilities, Inc. in connection with the transactions contemplated by the Merger Agreement.

Essential Adjournment Proposal: If presented at the Special Meeting, approval of the adjournment or postponement of the Special Meeting from time to time, if necessary or appropriate, to solicit additional proxies in the event there are not sufficient votes at the time of the Special Meeting (or any adjournment or postponement thereof) to approve the Merger Agreement Proposal, or to ensure that any supplement or amendment to the accompanying joint proxy statement/prospectus is timely provided to shareholders of Essential Utilities, Inc.