WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

Position in ERO — Ero Copper Corp.

CIK 1644956 CHICAGO, IL

Position in ERO

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

Position Value

$11,760,370

New position

Shares Held

439,640

first reported quarter

Ownership

0.422%

of shares outstanding

% of Portfolio

0.04%

of 13F equity value

Holder Rank

#36

of 208 holders

Holding Since

Jun 2026

1 quarter on record

Voting authority Sole 83% Shared 0% None 17%

Basic Materials · as of Jun 30, 2026

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $178,915,815 across 4 Copper names. ERO ranks #3 (6.6% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	HBM	Hudbay Minerals Inc.	4,215,842	$99,536,029
2	SCCO	Southern Copper Corp/	344,780	$59,368,996
3	ERO	Ero Copper Corp. This page	439,640	$11,760,370
4	TGB	Trekor Metals Ltd	1,199,189	$8,250,420

1 filing row on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$11,760,370	439,640	—	Shares	Sole	2026-08-12
No filing history on record for this holder in this stock.