American Water Works Company, INC. 8-K Filing

Key Financial Figures

• $0.01 — ich Registered Common stock, par value $0.01 per share AWK New York Stock Exchange
• $18.2 million — (the "Company"). The Order approved an $18.2 million annualized increase in water system rev
• $9.9 m — excluding infrastructure surcharges of $9.9 million, based on an authorized return on
• $489.4 m — OE of 9.70%, an authorized rate base of $489.4 million, and a capital structure with a c
• $212 million — e was driven primarily by approximately $212 million of capital investments completed and pl

Filing Documents

• awk-20251216.htm (8-K) — 31KB
• exhibit991-kawcgeneralrate.htm (EX-99.1) — 9KB
• imagea.jpg (GRAPHIC) — 84KB
• 0001410636-25-000185.txt ( ) — 290KB
• awk-20251216.xsd (EX-101.SCH) — 2KB
• awk-20251216_def.xml (EX-101.DEF) — 5KB
• awk-20251216_lab.xml (EX-101.LAB) — 25KB
• awk-20251216_pre.xml (EX-101.PRE) — 15KB
• awk-20251216_htm.xml (XML) — 3KB

01. Other Events

Item 8.01. Other Events. Kentucky Public Service Commission ("KPSC") Issuance of Final Order in Kentucky-American Water Company ("Kentucky American Water") General Rate Case On December 16, 2025, the KPSC issued a final order (the "Order") approving the adjustment of base rates requested in a general rate case originally filed on May 16, 2025 by Kentucky American Water, a wholly owned subsidiary of American Water Works Company, Inc. (the "Company"). The Order approved an $18.2 million annualized increase in water system revenues, excluding infrastructure surcharges of $9.9 million, based on an authorized return on equity ("ROE") of 9.70%, authorized rate base of $ 667.0 million, and a capital structure with a common equity component of 52.26% and a non-equity component of 47.74%, as compared to an authorized ROE of 9.70%, an authorized rate base of $489.4 million, and a capital structure with a common equity component of 52.22% and a non-equity component of 47.78%, all as approved in Kentucky American Water's last general rate case effective May 3, 2024. The Order also terminated Kentucky-American Water's Qualified Infrastructure Program ("QIP") rider and included the costs and investments of the QIP in approved base rates. The requested annualized revenue increase was driven primarily by approximately $212 million of capital investments completed and planned by Kentucky American Water from February 2025 through December 2026. The new rates are effective as of December 16, 2025. A copy of the press release issued by Kentucky American Water on December 17, 2025 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.

01. Financial Statements and Exhibits

Item 9.01. Financial Statements and Exhibits. (d) Exhibits. The following exhibits to this Current Report have been filed herewith (except as noted below): Exhibit No. Description 99.1* Press Release, dated December 1 7 , 2025, issued by Kentucky American Water. 104 Cover Page Interactive Data File (the cover page XBRL tags are included and formatted as Inline XBRL). *Filed herewith. 2

SIGNATURES

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: December 18, 2025 By: /s/ DAVID M. BOWLER David M. Bowler Executive Vice President and Chief Financial Officer 3

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