WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

Position in NWE — NorthWestern Energy Group, Inc.

CIK 1644956 CHICAGO, IL

Position in NWE

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

Position Value

$24,098,124

-$4,023,967 QoQ

Shares Held

336,472

-21.1% QoQ

Ownership

0.547%

of shares outstanding

% of Portfolio

0.07%

of 13F equity value

Holder Rank

#41

of 374 holders

Holding Since

Jun 2021

21 quarters on record

Voting authority Sole 62% Shared 0% None 38%

Utilities · as of Jun 30, 2026

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $57,119,355 across 4 Utilities - Regulated Electric names. NWE ranks #2 (42.2% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	IDA	Idacorp Inc	213,462	$32,296,800
2	NWE	NorthWestern Energy Group, Inc. This page	336,472	$24,098,124
3	PPL	PPL Corp	12,529	$455,429
4	ETR	Entergy Corp /De/	2,342	$269,002

21 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$24,098,124	336,472	-21.1%	Shares	Sole	2026-08-12
2026-03-31	$28,122,091	426,480	+3.2%	Shares	Sole	2026-05-08
2025-12-31	$26,676,189	413,328	-9.4%	Shares	Sole	2026-02-09
2025-09-30	$26,739,054	456,220	-5.7%	Shares	Sole	2025-11-12
2025-06-30	$24,822,736	483,874	-7.7%	Shares	Sole	2025-07-29
2025-03-31	$30,339,967	524,278	-5.0%	Shares	Sole	2025-05-09
2024-12-31	$29,512,699	552,052	+2.5%	Shares	Sole	2025-02-10
2024-09-30	$30,824,414	538,700	-2.9%	Shares	Sole	2024-11-08
2024-06-30	$27,796,453	555,041	-0.2%	Shares	Sole	2024-08-08
2024-03-31	$28,320,797	556,073	-0.0%	Shares	Sole	2024-05-08
2023-12-31	$28,312,549	556,348	-1.9%	Shares	Sole	2024-02-09
2023-09-30	$27,251,557	567,032	-6.8%	Shares	Sole	2023-11-09
2023-06-30	$34,542,887	608,578	+1.9%	Shares	Sole	2023-08-11
2023-03-31	$34,557,868	597,267	+0.4%	Shares	Sole	2023-05-12
2022-12-31	$35,312,284	595,084	-3.7%	Shares	Sole	2023-02-09
2022-09-30	$30,455,532	618,010	-2.0%	Shares	Sole	2022-11-09
2022-06-30	$37,154,304	630,482	+7.5%	Shares	Sole	2022-08-10
2022-03-31	$35,485,067	586,627	-1.3%	Shares	Sole	2022-05-11
2021-12-31	$33,958,756	594,100	-7.4%	Shares	Sole	2022-02-14
2021-09-30	$36,754,683	641,443	+48678.9%	Shares	Sole	2021-11-10
2021-06-30	$79,189	1,315	—	Shares	Sole	2021-08-12
No filing history on record for this holder in this stock.