H2O America (HTO) 10% owner nets 29,566-share mixed trade

Rhea-AI Filing Summary

H2O America had a Form 4/A filed by ten percent owners ATLAS Infrastructure Partners (UK) Ltd. and GIP ATLAS Holdings Ltd showing both buying and selling activity in its common stock. On May 29, 2026, the reporting holder executed an open-market purchase of 31,001 shares of common stock at an average price of $57.624 per share and an open-market sale of 1,435 shares at an average price of $57.5217 per share. These transactions resulted in a net increase of 29,566 shares, bringing the reporting holder’s direct ownership to 4,581,034 shares of H2O America common stock after the trades.

Insider Trade Summary

Net Buyer: 29,566 shares ($1,786,402)

Net Buy 2 txns

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

Role null | null

Bought 31,001 shs ($1.79M)

Sold 1,435 shs ($83K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,435	$57.5217	$83K
Purchase	Common Stock	31,001	$57.624	$1.79M

Holdings After Transaction: Common Stock — 4,581,034 shares (Direct, null)

Footnotes (1)

Key Figures

Shares purchased: 31,001 shares Purchase price: $57.624 per share Shares sold: 1,435 shares +3 more

6 metrics

Shares purchased 31,001 shares Open-market purchase of H2O America common stock on May 29, 2026

Purchase price $57.624 per share Average price for 31,001-share open-market buy

Shares sold 1,435 shares Open-market sale of H2O America common stock on May 29, 2026

Sale price $57.5217 per share Average price for 1,435-share open-market sale

Net share change 29,566 shares Net buy per transaction summary (buys minus sells)

Shares owned after trades 4,581,034 shares Direct H2O America common stock ownership after May 29, 2026 trades

Key Terms

open-market purchase, open-market sale, ten percent owner

3 terms

open-market purchase financial

"transaction_action": "open-market purchase"

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

open-market sale financial

"transaction_action": "open-market sale"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

ten percent owner financial

""is_ten_percent_owner": 1"

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Form 4 Insider Transactions: What Each Field Means →

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)
05/29/2026

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)
04/13/2026

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	05/29/2026		S		1,435	D	$57.5217	4,581,034	D
Common Stock	05/29/2026		P		31,001	A	$57.624	4,612,035	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:

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.

	/s/ Toni Rizk	06/02/2026
	** 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)

FAQ

What insider activity did H2O America (HTO) report on this Form 4/A?

H2O America reported that a ten percent owner conducted both an open-market purchase and sale of common stock on May 29, 2026. The transactions resulted in a net increase of 29,566 shares in the holder’s direct ownership stake.

How many H2O America (HTO) shares were bought and sold in the latest filing?

The reporting holder bought 31,001 shares and sold 1,435 shares of H2O America common stock. Both trades occurred on May 29, 2026, resulting in a net addition of 29,566 shares to the holder’s position.

What prices were paid and received for H2O America (HTO) shares in this Form 4/A?

The reporting holder purchased H2O America common stock at an average price of $57.624 per share and sold shares at an average price of $57.5217 per share. Both transactions were classified as open-market trades.

What is the reporting holder’s total H2O America (HTO) ownership after these transactions?

After completing the reported trades, the ten percent owner directly holds 4,581,034 shares of H2O America common stock. This reflects the net addition of 29,566 shares disclosed in the May 29, 2026 open-market transactions.

Who are the reporting persons in the H2O America (HTO) Form 4/A filing?

The reporting persons are ATLAS Infrastructure Partners (UK) Ltd. and GIP ATLAS Holdings Ltd. Both are identified as ten percent owners of H2O America, with the filing describing their direct ownership in the company’s common stock.