Boston Partners

Position in MEC — Mayville Engineering Company, Inc.

CIK 1386060 BOSTON, MA

Position in MEC

as of Jun 30, 2026 · filed Aug 4, 2026 Compact

Position Value

$26,088,230

+$21,912,397 QoQ

Shares Held

696,429

+199.4% QoQ

Ownership

2.73%

of shares outstanding

% of Portfolio

0.02%

of 13F equity value

Holder Rank

#10

of 154 holders

Holding Since

Sep 2025

4 quarters on record

Voting authority Sole 95% Shared 0% None 5%

Industrials · as of Jun 30, 2026

Boston Partners holds $297,781,549 across 4 Metal Fabrication names. MEC ranks #3 (8.8% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	CMC	COMMERCIAL METALS Co	3,743,011	$234,873,938
2	ESAB	ESAB Corp	368,180	$36,313,592
3	MEC	Mayville Engineering Company, Inc. This page	696,429	$26,088,230
4	IIIN	Insteel Industries Inc	16,748	$505,789

4 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$26,088,230	696,429	+199.4%	Shares	Defined	2026-08-04
2026-03-31	$4,175,833	232,637	+4.4%	Shares	Defined	2026-05-11
2025-12-31	$4,169,505	222,730	+12.4%	Shares	Defined	2026-02-13
2025-09-30	$2,726,681	198,160	—	Shares	Defined	2025-11-13
No filing history on record for this holder in this stock.