AWK: Financial results

Item 2.02. Results of Operations and Financial Condition. On October 28, 2026, American Water Works Company, Inc. (the “Company”) issued a press release announcing its financial results for the third quarter ended September 30, 2026. A copy of the press release has been included as Exhibit 99.1 and is incorporated by reference herein. The information furnished in Item 2.02 of this Current Report on Form 8-K, including Exhibit 99.1 , shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), nor shall it be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, except as shall be expressly set forth by specific reference in such filing. Item 9.01. Financial Statements and Exhibits. (d) Exhibits. The following exhibits to this Current Report have been provided herewith (as noted below): Exhibit Description 99.1* Press Release, dated Oc to ber 2 8 , 2026, issued by American Water Works Company, Inc. 104 Cover Page Interactive Data File (the cover page XBRL tags are included and formatted as Inline XBRL) * Furnished herewith. 2 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. AMERICAN WATER WORKS COMPANY, INC. Dated: October 28, 2026 By: /s/ DAVID M. BOWLER David M. Bowler Executive Vice President and Chief Financial Officer 3