WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

Position in NWN — Northwest Natural Holding Co

CIK 1644956 CHICAGO, IL

Position in NWN

as of Mar 31, 2026 · filed May 8, 2026 Compact

Position Value

$31,623,536

+$4,738,782 QoQ

Shares Held

594,204

+3.3% QoQ

Ownership

1.41%

of shares outstanding

% of Portfolio

0.11%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Dec 2025

2 quarters on record

Voting authority Sole 69.33056660675459.ToString("F0")% Shared 0.ToString("F0")% None 30.669433393245416.ToString("F0")%

Utilities · as of Mar 31, 2026

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $87,981,677 across 4 Utilities - Regulated Gas names. NWN ranks #2 (35.9% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	SR	Spire Inc	350,033	$31,691,987
2	NWN	Northwest Natural Holding Co This page	594,204	$31,623,536
3	CTRI	Centuri Holdings, Inc.	827,449	$24,169,785
4	NI	Nisource Inc.	10,638	$496,369

2 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
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.