H2O America

HTO · NASDAQ

$56.87+$0.99 (+1.77%)TodayMarket closed · Oct 20, 4:05 PM ET

Prev close $55.88

Who owns HTO

Largest institutional holders, from their latest 13F filings

The 10 largest institutions hold 66.8% of HTO’s shares.

BlackRock Institutional Trust Company, N.A.12.9%
ATLAS Infrastructure Partners (UK) Ltd11.0%
GIP ATLAS Holdings Ltd.10.9%
Future Fund Board of Guardians6.2%
Next 6 largest institutions25.7%
All other shareholders33.2%

Top institutional holders of HTO
Holder	Shares	% of shares	Change, last filing	Filed
BlackRock Institutional Trust Company, N.A.	5.41M	12.94%	+355.84K	Jun 30, 2026
ATLAS Infrastructure Partners (UK) Ltd	4.62M	11.03%	+6.01K	Jul 7, 2026
GIP ATLAS Holdings Ltd.	4.57M	10.93%	+50.38K	Apr 10, 2026
Future Fund Board of Guardians	2.60M	6.22%	+2.60M	Mar 3, 2026
Moss (Melinda C)	2.55M	6.10%	+0	Mar 24, 2026
Wellington Management Company, LLP	2.00M	4.77%	+382.27K	Jun 30, 2026
Antipodes Partners Limited	1.76M	4.20%	−489.43K	Jun 30, 2026
Vanguard Capital Management, LLC	1.57M	3.76%	−112.88K	Jun 30, 2026
State Street Investment Management (US)	1.55M	3.71%	+123.53K	Jun 30, 2026
Cerity Partners LLC	1.31M	3.12%	−2.45K	Jun 30, 2026

Largest mutual fund holders

Top mutual fund holders of HTO
Holder	Shares	% of shares	Change, last filing	Filed
iShares Core S&P Small-Cap ETF	2.40M	5.72%	−443	Aug 31, 2026
Vanguard Total Stock Market Index Fund	1.07M	2.56%	+5.31K	Jul 31, 2026
iShares Russell 2000 ETF	914.33K	2.18%	−3.98K	Jul 31, 2026
ATLAS Global Infrastructure Fund	719.41K	1.72%	+0	Jun 30, 2026
Renaissance Global Infrastructure Fund	666.30K	1.59%	+562.02K	Mar 31, 2026

Insider trades

Form 4 filings by officers, directors and large holders

Over the last 6 months, insiders bought $2.26M (4 trades) and sold $184.94K (2 trades) of HTO on the open market.

Latest HTO insider transactions
Insider	Date	Type	Shares	Price	Value
Mattern Megan	Jul 30, 2026	Tax withholding	1.15K	$61.97	$71.51K
ATLAS Infrastructure Partners (UK) Ltd.	Jul 7, 2026	Buy	2.78K	$62.03	$172.69K
ATLAS Infrastructure Partners (UK) Ltd.	Jul 7, 2026	Buy	2.78K	$62.03	$172.69K
ATLAS Infrastructure Partners (UK) Ltd.	Jul 1, 2026	Buy	2.13K	$60.76	$129.53K
ATLAS Infrastructure Partners (UK) Ltd.	Jul 1, 2026	Sale	1.69K	$60.74	$102.40K
Kelly Ann P	Jul 1, 2026	Tax withholding	88	$60.74	$5.35K
Walters Andrew F	Jul 1, 2026	Other	374	$60.74	$22.72K
Walters Andrew F	Jun 5, 2026	Gift	3.51K	—	—
ATLAS Infrastructure Partners (UK) Ltd.	May 29, 2026	Buy	31.00K	$57.62	$1.79M
ATLAS Infrastructure Partners (UK) Ltd.	May 29, 2026	Sale	1.44K	$57.52	$82.54K

Short interest

Settled Sep 30, 2026

Shares short: 2.01M
Days to cover: 3.88
% of shares outstanding: 4.81%
Average daily volume: 519.10K
Change since last report: −61.0%

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