AWK: Other company developments

Item 8.01. Other Events. Filing of Rate Request with the Missouri Public Service Commission (the “MoPSC”) by Missouri-American Water Company (“Missouri American Water”) On July 1, 2026 , Missouri American Water, a wholly owned subsidiary of American Water Works Company, Inc. (the “Company”), announced that it filed with the MoPSC a request for new water and wastewater rates. The request seeks annualized incremental revenue of approximately $179 million, excluding infrastructure surcharges of approximately $32 million, of which $18 million remains subject to approval. The request is based on a return on equity of 10.50 % and a capital structure with an equity component of 50.3% and a long-term debt component of 49.7%. The requested annualized incremental revenue is driven primarily by approximately $1.6 billion of incremental capital investments completed and planned by Missouri American Water from June 2025 through May 2028, the forecasted future test period . Missouri American Water anticipates that new rates will take effect in June 2027. Pursuant to statutory requirements, Missouri American Water will implement subsequent rate adjustments following the conclusion of the future test year based on required reconciliations, subject to regulatory approval. A copy of the press release issued by Missouri American Water on July 1, 2026 , has been filed as Exhibit 99.1 hereto and is incorporated herein by reference. References and links to websites and other information contained in this press release are not provided as active hyperlinks, and the information contained in or accessed through these hyperlinks shall not be incorporated into, or form a part of, this Current Report on Form 8-K. Cautionary Statement Concerning Forward-Looking Statements Certain statements include