WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

Position in NWN — Northwest Natural Holding Co

CIK 1644956 CHICAGO, IL

Position in NWN

as of Jun 30, 2026 · filed Aug 12, 2026 Compact

Position Value

$23,009,532

-$8,614,004 QoQ

Shares Held

469,008

-21.1% QoQ

Ownership

1.11%

of shares outstanding

% of Portfolio

0.07%

of 13F equity value

Holder Rank

#17

of 315 holders

Holding Since

Dec 2025

3 quarters on record

Voting authority Sole 62% Shared 0% None 38%

Utilities · as of Jun 30, 2026

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $64,825,041 across 4 Utilities - Regulated Gas names. NWN ranks #1 (35.5% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	NWN	Northwest Natural Holding Co This page	469,008	$23,009,532
2	SR	Spire Inc	276,218	$21,569,863
3	CTRI	Centuri Holdings, Inc.	652,696	$19,737,527
4	NI	Nisource Inc.	10,686	$508,119

3 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$23,009,532	469,008	-21.1%	Shares	Sole	2026-08-12
2026-03-31	$31,623,536	594,204	+3.3%	Shares	Sole	2026-05-08
2025-12-31	$26,884,754	575,198	—	Shares	Sole	2026-02-09
No filing history on record for this holder in this stock.