FRONTIER CAPITAL MANAGEMENT CO LLC

Position in MLI — Mueller Industries Inc

CIK 351173 Boston, MA

Position in MLI

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$15,647,342

+$3,380,274 QoQ

Shares Held

282,443

+32.2% QoQ

Ownership

0.255%

of shares outstanding

% of Portfolio

0.16%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Dec 2025

2 quarters on record

Voting authority Sole 92.8151874891571.ToString("F0")% Shared 0.ToString("F0")% None 7.184812510842896.ToString("F0")%

Industrials · as of Mar 31, 2026

FRONTIER CAPITAL MANAGEMENT CO LLC holds $189,835,185 across 4 Metal Fabrication names. MLI ranks #4 (8.2% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	ATI	Ati Inc	694,422	$101,010,624
2	CRS	Carpenter Technology Corp	99,134	$39,073,666
3	RYZ	Ryerson Holding Corp	1,517,062	$34,103,553
4	MLI	Mueller Industries Inc This page	282,443	$15,647,342

2 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$15,647,342	282,443	+32.2%	Shares	Sole	2026-05-15
2025-12-31	$12,267,068	213,712	—	Shares	Sole	2026-02-17
No filing history on record for this holder in this stock.