Changes in Beneficial Ownership · 4

H2O America

HTONASDAQEQUITYCurrent

Changes in Beneficial Ownership

Filed Jun 3, 2026Accepted Jun 3, 2026, 5:02 PM EDTFiling CIK 766829Accession 0001313291-26-000004

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Structured filing — 4

wk-form4_1780520535.xml

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Filing details

Report period: 2026-06-02
Issuer: H2O AMERICA
Issuer CIK: 0000766829
Trading symbol: HTO

Reporting owner 1

Name: Johnson A Kristen
Reporting owner CIK: 0001313291
Relationship: Officer
Officer title: Chief Administrative Officer
Address: 110 W. TAYLOR STREET, SAN JOSE, CA, 95110

Non-derivative holdings

Non-derivative holdings · 1 reported row
Security	Amount owned	Ownership
Common Stock	14,565^[F1]	D

Table key

D: Direct

Derivative transactions

Derivative transactions · 1 reported row
Security	Conversion / exercise price (USD)	Transaction date	Code	Amount	A / D	Price (USD)	Exercisable	Expires	Underlying security	Underlying shares	Owned after	Ownership
Common Stck	^[F2]	2026-06-02	A · Form 4	0^[F2]	A	^[F2]	^[F2]	^[F2]	Common Stock	139	18,160	D

Table key

A · Form 4: Acquisition by grant, award or otherwise under Rule 16b-3(d)
A: Acquired
D: Direct

Footnotes

F1: Represents 9,040 shares of Common Stock and 5,525 shares of the Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.↩ 1
F2: Represents 139 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.↩ 1 ↩ 2 ↩ 3 ↩ 4 ↩ 5

Signature 1

Signed: /s/ Willie Brown, Attorney-in-Fact for Kristen A. Johnson
Date: 2026-06-03

Company context

H2O America (NASDAQ: HTO) is a national investor-owned network of local water and wastewater utilities united by one purpose: delivering clean, high-quality water to the communities we call home. For H2O America, providing water is more than a responsibility - it’s a privilege. Every connection we serve helps sustain what matters most: public health, vibrant neighborhoods, and a reliable future. Across approximately 409,000 water and wastewater service connections, we invest in critical infrastructure to strengthen water supply for generations to come. We stay actively engaged in our local communities while focusing on operational excellence and delivering sustainable, long-term value to our investors.

Current securities

HTONASDAQ · EQUITY · Current

Historical securities (1)

SJWOTC · EQUITY · Historical · closed May 5, 2025

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