Company: AWK
Filing Date: 2025-12-17
Form Type: S-4
Source: 0001193125-25-321389
Chunk: 0

Company: American Water Works Company, Inc.
Filing Date: 2025-12-17
Form: S-4
Chunk 0
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As filed with the U.S. Securities and Exchange Commission on December 16, 2025 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form S-4 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AMERICAN WATER WORKS COMPANY, INC. (Exact name of registrant as specified in its charter)

| Delaware                        |     |                         4941 |     | 51-0063696            |
| (State or other jurisdiction of 
 incorporation or organization)  |     | -Primary Standard Industrial 
   Classification Code Number |     | -I.R.S. Employer      
 Identification Number |

1 Water Street Camden, NJ 08102-1658 (856) 955-4001 (Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices) Stacy A. Mitchell, Esq. Executive Vice President and General Counsel American Water Works Company, Inc. 1 Water Street Camden, NJ 08102-1658 (856) 955-4001 (Name, address, including zip code, and telephone number, including area code, of agent for service) Copies To:

| Pankaj K. Sinha, Esq.                    
 Emily Prezioso Walsh, Esq.               
 Skadden, Arps, Slate, Meagher & Flom LLP 
 1440 New York Avenue, N.W.               
 Washington, DC 20005-2111                
 (202) 371-7000                           |     | Christopher P. Luning, Esq.               
 Executive Vice President, General Counsel 
 Essential Utilities, Inc.                 
 762 West Lancaster Avenue                 
 Bryn Mawr, PA 19010-3489                  
 (610) 527-8000                            |     | George Stamas, Esq.         
 Alexander Fine, Esq.        
 Evan D’Amico, Esq.          
 Gibson, Dunn & Crutcher LLP 
 1700 M Street N.W.          
 Washington, DC 20036-4504   
 (202)                       
 955-8500                    |

Approximate date of commencement of proposed sale of the securities to the public:As soon as practicable after the effectiveness of this registration statement and the satisfaction or waiver of all other conditions to the completion of the merger described herein. If the securities being registered on this Form are being offered in connection with the formation of a holding company and there is compliance with General