Company: AWK
Filing Date: 2025-12-17
Form Type: S-4
Source: 0001193125-25-321389
Chunk: 244

Company: American Water Works Company, Inc.
Filing Date: 2025-12-17
Form: S-4
Chunk 244
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 Essential, as the case may be, without charge, excluding any exhibits to them unless the exhibit is specifically listed as an exhibit to the registration statement on Form S-4of which this joint proxy statement/prospectus forms a part. You may also obtain documents incorporated by reference into this joint proxy statement/prospectus by requesting them in writing or by telephone from D.F. King & Co, Inc., American Water’s proxy solicitor, or MacKenzie Partners, Inc., Essential’s proxy solicitor, at the following addresses and telephone numbers:

| For American Water Shareholders:                       |     | For Essential Shareholders:                                             |
| 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                                  |     | MacKenzie Partners, Inc. 7 Penn                                         
 Plaza New York, New York 10001 Shareholders may call toll               
 free: (800) 322-2885 Banks and Brokers may call collect: (212) 929-5500 
 Email: proxy@MacKenziePartners.com                                      |

If you are a shareholder of Essential or American Water and would like to request documents, please do so by [ ], 2026, which is five business days before the special meetings, to receive them before your respective company’s special meeting. If you request any documents from American Water or Essential, American Water or Essential, as applicable, will mail them to you by first class mail, or another equally prompt means, within one business day after American Water or Essential, as the case may be, receives your request. This joint proxy statement/prospectus is a prospectus of American Water and is a joint proxy statement of American Water and Essential for the American Water special meeting and the Essential special meeting. Neither American Water nor Essential has authorized anyone to give any information or make any representation about the merger or American Water or Essential that is different from, or in addition to, that contained in this joint proxy statement/prospectus or in any of the materials that American Water or Essential has incorporated by reference into this joint proxy statement/prospectus. Therefore, if anyone does give you information of this sort, you should not rely on it. The information contained in this joint proxy statement/prospectus speaks only as of the