Driehaus Capital Management LLC

Position in MEC — Mayville Engineering Company, Inc.

CIK 938206 Chicago, IL

Position in MEC

as of Jun 30, 2026 · filed Aug 14, 2026 Compact

Position Value

$31,704,420

New position

Shares Held

846,354

first reported quarter

Ownership

3.32%

of shares outstanding

% of Portfolio

0.18%

of 13F equity value

Holder Rank

#5

of 153 holders

Holding Since

Jun 2026

1 quarter on record

Voting authority Sole 78% Shared 0% None 22%

Industrials · as of Jun 30, 2026

Driehaus Capital Management LLC holds $242,453,266 across 4 Metal Fabrication names. MEC ranks #3 (13.1% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	CRS	Carpenter Technology Corp	227,203	$140,147,898
2	ATI	Ati Inc	205,124	$40,429,940
3	MEC	Mayville Engineering Company, Inc. This page	846,354	$31,704,420
4	PRLB	Proto Labs Inc	370,151	$30,171,008

1 filing row on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$31,704,420	846,354	—	Shares	Sole	2026-08-14
No filing history on record for this holder in this stock.