H2O AMERICA

H2O America intends to post information about the operating and financial performance of H2O America and its subsidiaries on its website www.h2o-america.com from time to time. The content of H2O America’s website is not incorporated by reference to or part of this report.

a. There is no information that was required to be disclosed in a report on Form 8-K during the fourth quarter of 2025 but was not reported.

b. In the quarter ended December 31, 2025, none of our directors or officers (as defined in Rule 16a-1(f) of the Exchange Act)adopted orterminated a plan for the purchase or sale of our securities intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or a non-Rule 10b5-1 trading arrangement for the purchase or sale of our securities, within the meaning of Item 408 of Regulation S-K.

Appointment of New Director

On February 25, 2026, the Board of Directors (the “Board”) of H2O America increased the size of the Board from nine to ten directors, effective as of March 1, 2026, and upon the recommendation of the Nominating and Governance Committee of the Board, appointed Nick O. Rowe to serve as a member of the Board, effective March 1, 2026. In connection with his appointment, the Board also appointed Mr. Rowe to serve as a member of each of the Board’s Sustainability Committee and Finance Committee.

Mr. Rowe is President of N.O.R. Solutions LLC, a leadership coaching and training firm. He previously served as Senior Vice President of American Water Works Company, Inc., where he was employed from September 1987 until his retirement in May 2022.

In connection with his service as a non-employee director, Mr. Rowe will receive compensation and participate in the Company’s Second Amended and Restated Formulaic Equity Award Program for Non-Employee Board Members implemented under the Company’s 2023 Long-Term Incentive Plan, as described in the Company’s form 10-K filed with the Securities and Exchange Commission on February 28, 2025.

In addition, the Company has entered into a director and officer indemnification agreement with Mr. Rowe in the form attached as Exhibit 10.1 to the Company’s Form 8-K filed with the SEC on November 15, 2016.