Company: AWK
Filing Date: 2025-03-27
Form Type: DEFA14A
Source: 0001193125-25-064630
Chunk: 0

Company: American Water Works Company, Inc.
Filing Date: 2025-03-27
Form: DEFA14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒Filed by a Party other than the Registrant ☐ Check the appropriate box:

| ☐ |     | Preliminary Proxy Statement                                                     |
| ☐ |     | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| ☐ |     | Definitive Proxy Statement                                                      |
| ☒ |     | Definitive Additional Materials                                                 |
| ☐ |     | Soliciting Material Pursuant to § 240.14a-12                                    |

AMERICAN WATER WORKS COMPANY, INC. (Name of Registrant as Specified in its Charter) (Name of Person(s) Filing Proxy Statement if other than the Registrant) Payment of Filing Fee (Check the appropriate box):

| ☒ |     | No fee required                                                                                     |
| ☐ |     | Fee paid previously with preliminary materials                                                      |
| ☐ |     | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |

You invested in AMERICAN WATER WORKS COMPANY, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the shareholder meeting to be held on May 14, 2025. Get informed before you vote View the 2025 Proxy Statement, 2024 Annual Report and form of Proxy Card online OR you can receive a free paper or email copy of the material(s) by requesting prior to April 30, 2025. If you would like to request a copy of the material(s) for this and/or future shareholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. Information concerning the availability of the list of shareholders of record entitled to vote at the Annual Meeting can be found in the 2025 Proxy Statement.

| * | Please check the meeting materials for