H2O America CAO reports tax-withheld share disposition

H2O America officer Megan Mattern, CAO, PAO and Controller, reported a tax-withholding disposition of 1,154 shares of Common Stock on July 30, 2026.

Rhea-AI Filing Summary

H2O America officer Megan Mattern, CAO, PAO and Controller, reported a tax-withholding disposition of 1,154 shares of Common Stock on July 30, 2026. These shares were withheld by the issuer at $61.97 per share to satisfy withholding taxes triggered by the vesting of previously granted RSUs. After this event, she holds 3,052 shares of Common Stock and 10,579 RSU-based shares that will vest and become issuable under their terms, reflecting a total equity-based interest of 13,631 shares.

Insider Trade Summary

Tax Withholding: 1,154 shares

Tax Withholding 1 txn

Insider Mattern Megan

Role CAO, PAO and Controller

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1, F2	1,154	$61.97	$72K

Holdings After Transaction: Common Stock — 13,631 shares (Direct)

Footnotes (2)

1. F1. Represents 1,154 shares of the issuer's common stock (Common Stock) withheld in satisfaction of applicable withholding taxes upon the vesting of certain shares of Common Stock that became issuable on July 30, 2026 pursuant to the terms of the Restricted Stock Unit Issuance Agreement between the reporting person and the issuer dated July 30, 2025. The shares underlying such restricted stock units (RSUs) were previously reported as Table I securities at the time the RSUs were granted. Accordingly, the issuance of such shares is not a reportable transaction on this Form 4.
2. F2. Represents 3,052 shares of Common Stock and 10,579 shares of the Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

Key Figures

Shares withheld for taxes: 1,154 shares of Common Stock Withholding value per share: $61.97 per share Common Stock holdings after transaction: 3,052 shares +2 more

5 metrics

Shares withheld for taxes 1,154 shares of Common Stock Withheld on July 30, 2026 to satisfy RSU-related withholding taxes

Withholding value per share $61.97 per share Value applied to the 1,154 shares withheld for tax obligations

Common Stock holdings after transaction 3,052 shares Direct Common Stock held by Megan Mattern following the withholding event

Unvested RSUs after transaction 10,579 shares underlying RSUs RSUs that will vest and become issuable in accordance with their terms

Total equity-based interest 13,631 shares Sum of 3,052 Common Stock shares and 10,579 RSU-based shares after the transaction

Key Terms

Restricted Stock Unit Issuance Agreement, restricted stock units (RSUs), withholding taxes, vest and become issuable

4 terms

Restricted Stock Unit Issuance Agreement financial

"pursuant to the terms of the Restricted Stock Unit Issuance Agreement"

restricted stock units (RSUs) financial

"The shares underlying such restricted stock units (RSUs) were previously reported"

Restricted stock units (RSUs) are a type of company promise to give employees shares of stock in the future, usually after certain conditions like working for a set time. They are like a gift promised today that you receive later, which can become valuable if the company's stock price goes up. RSUs matter because they are a way companies reward employees and can be a significant part of compensation.

withholding taxes financial

"withheld in satisfaction of applicable withholding taxes upon the vesting"

Withholding taxes are amounts a payer or government takes out of payments — such as wages, interest, or dividends — before the recipient gets the money, functioning like a cashier keeping part of a bill to pay taxes on your behalf. For investors this matters because it reduces the cash they actually receive, affects net returns and yield calculations, and may require additional paperwork or treaty claims to recover or offset the withheld amount against final tax bills.

vest and become issuable financial

"RSUs which will vest and become issuable in accordance with their terms"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What transaction did H2O America (HTO) officer Megan Mattern report?

Megan Mattern reported a tax-withholding disposition of 1,154 shares of H2O America Common Stock. The shares were withheld by the issuer to cover withholding taxes due when her restricted stock units vested on July 30, 2026.

How many H2O America (HTO) shares were involved in the tax withholding?

The filing shows 1,154 shares of H2O America Common Stock were withheld. These shares satisfied the applicable withholding taxes arising from the vesting of certain RSUs, based on a value of $61.97 per share.

Was Megan Mattern’s H2O America (HTO) transaction an open-market sale?

No, the Form 4 describes a tax-withholding disposition, not an open-market sale. Shares were withheld by the issuer to pay tax obligations tied to RSU vesting, rather than sold through market transactions.

What are Megan Mattern’s H2O America (HTO) holdings after this Form 4?

After the reported transaction, Megan Mattern holds 3,052 shares of H2O America Common Stock and 10,579 RSU-based shares. Those RSUs will vest and become issuable in the future according to their existing terms.

Did the H2O America (HTO) Form 4 involve newly granted RSUs to Megan Mattern?

No, the footnote explains the RSUs were previously granted under a Restricted Stock Unit Issuance Agreement dated July 30, 2025. The current report covers share withholding for taxes, not a new RSU grant or issuance.

Is Megan Mattern’s H2O America (HTO) Form 4 tied to a Rule 10b5-1 plan?

The filing’s Rule 10b5-1 checkbox is not marked as affirmative, and the footnotes do not reference any trading plan. The reported disposition is specifically described as shares withheld for tax obligations at vesting.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/03/2026 - 07:07 PM Accepted by SEC EDGAR 08/03/2026 - 07:06 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Mattern Megan

(Last) (First) (Middle)

110 W. TAYLOR STREET

(Street)

SAN JOSE CALIFORNIA 95110

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
H2O AMERICA [ HTO ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CAO, PAO and Controller

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/30/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	07/30/2026		F		1,154(1)	D	$61.97	13,631(2)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents 1,154 shares of the issuer's common stock (Common Stock) withheld in satisfaction of applicable withholding taxes upon the vesting of certain shares of Common Stock that became issuable on July 30, 2026 pursuant to the terms of the Restricted Stock Unit Issuance Agreement between the reporting person and the issuer dated July 30, 2025. The shares underlying such restricted stock units (RSUs) were previously reported as Table I securities at the time the RSUs were granted. Accordingly, the issuance of such shares is not a reportable transaction on this Form 4.

2. Represents 3,052 shares of Common Stock and 10,579 shares of the Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

Remarks:

	/s/ Willie Brown Attorney-in-Fact for Megan Mattern	08/03/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)