WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

Position in JBI — Janus International Group, Inc.

CIK 1644956 CHICAGO, IL

Position in JBI

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

Position Value

$14,058,243

-$3,194,054 QoQ

Shares Held

2,729,756

+3.5% QoQ

Ownership

2.00%

of shares outstanding

% of Portfolio

0.05%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Sep 2024

7 quarters on record

Voting authority Sole 69.16530268639394.ToString("F0")% Shared 0.ToString("F0")% None 30.834697313606053.ToString("F0")%

Industrials · as of Mar 31, 2026

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $182,215,227 across 5 Building Products & Equipment names. JBI ranks #4 (7.7% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	WMS	Advanced Drainage Systems, Inc.	655,684	$89,913,946
2	LPX	Louisiana-Pacific Corp	596,108	$43,366,857
3	TREX	Trex Co Inc	647,178	$23,570,222
4	JBI	Janus International Group, Inc. This page	2,729,756	$14,058,243
5	OC	Owens Corning	104,472	$11,305,959

7 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$14,058,243	2,729,756	+3.5%	Shares	Sole	2026-05-08
2025-12-31	$17,252,297	2,637,966	-5.0%	Shares	Sole	2026-02-09
2025-09-30	$27,411,358	2,777,240	-23.6%	Shares	Sole	2025-11-12
2025-06-30	$29,607,288	3,637,259	-7.3%	Shares	Sole	2025-07-29
2025-03-31	$28,249,560	3,923,550	+47.8%	Shares	Sole	2025-05-09
2024-12-31	$19,513,228	2,654,861	+1.8%	Shares	Sole	2025-02-10
2024-09-30	$26,366,091	2,607,922	—	Shares	Sole	2024-11-08
No filing history on record for this holder in this stock.