[Form 4/A] H2O AMERICA Amended Insider Trading Activity

Rhea-AI Filing Summary

ATLAS Infrastructure Partners (UK) Ltd. and GIP ATLAS Holdings Ltd, each a ten percent owner of H2O AMERICA, reported an open-market purchase of 2,784 shares of common stock on July 7, 2026 at $62.03 per share. Following this transaction, their reported direct holdings total 4,615,265 shares of H2O AMERICA common stock.

Filing Explained

The amendment reports a 2,784-share open-market purchase that changes reported beneficial ownership at the holder level, not H2O America's capital structure.

The July 13, 2026 Form 4/A amends a Form 4 originally filed on July 8, 2026 and reports a 2,784-share purchase of H2O America common stock on July 7.

This is a holder-level acquisition reported by the filer, so it changes the reporting person's reported beneficial ownership rather than describing an issuer transaction.

Under the supplied Form 4 definitions, transaction code P means an open-market purchase, and Form 4 reports an insider transaction within two business days.

No Rule 10b5-1 plan disclosure appears in the supplied filing for this purchase.

The table reports 2,784 shares acquired at $62.03, with 4,615,265 shares shown as directly beneficially owned afterward; the remarks state that the securities are held for client accounts and managed funds rather than for the reporting person's own account.

Insider Trade Summary

Net Buyer: 2,784 shares ($172,692)

Net Buy 1 txn

Insider ATLAS Infrastructure Partners (UK) Ltd., GIP ATLAS Holdings Ltd

Role 10% Owner | 10% Owner

Bought 2,784 shs ($173K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	2,784	$62.03	$173K

Holdings After Transaction: Common Stock — 4,615,265 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/13/2026 - 12:03 PM Accepted by SEC EDGAR 07/13/2026 - 12:02 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^*

ATLAS Infrastructure Partners (UK) Ltd.

(Last) (First) (Middle)

1ST FLOOR WEST

1-3 COLLEGE HILL

(Street)

LONDON EC4R 2RA

(City) (State) (Zip)

UNITED KINGDOM

(Country)

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

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

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

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

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

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

4. If Amendment, Date of Original Filed (Month/Day/Year)
07/08/2026

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	07/07/2026		P		2,784	A	$62.03	4,615,265	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

1. Name and Address of Reporting Person^*

ATLAS Infrastructure Partners (UK) Ltd.

(Last) (First) (Middle)

1ST FLOOR WEST

1-3 COLLEGE HILL

(Street)

LONDON EC4R 2RA

(City) (State) (Zip)

UNITED KINGDOM

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

GIP ATLAS Holdings Ltd

(Last) (First) (Middle)

1ST FLOOR WEST, 1-3 COLLEGE HILL

(Street)

LONDON EC4R 2RA

(City) (State) (Zip)

UNITED KINGDOM

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

Explanation of Responses:

Remarks:

1. GIP Atlas Holdings Limited is the sole owner of Atlas Infrastructure Partners (UK) Ltd, holding 100% of its equity interests; however, it does not exercise investment discretion with respect to the entity. 2. The securities reported herein are held for the accounts of various underlying clients and investment funds managed and/or advised by the Reporting Person. The Reporting Person may be deemed to beneficially own such securities by virtue of its investment discretion and/or voting authority over such accounts. The filing does not reflect beneficial ownership of the securities by the Reporting Person for its own account.

	/s/ Toni Rizk	07/13/2026
	** 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)