WELLINGTON MANAGEMENT GROUP LLP

Position in MEC — Mayville Engineering Company, Inc.

CIK 902219 Boston, MA

Position in MEC

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

Position Value

$17,890,257

+$15,684,981 QoQ

Shares Held

477,583

+102.9% QoQ

Ownership

1.87%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

#13

of 153 holders

Holding Since

Mar 2020

10 quarters on record

Voting authority Sole 0% Shared 80% None 20%

Industrials · as of Jun 30, 2026

WELLINGTON MANAGEMENT GROUP LLP holds $397,557,003 across 6 Metal Fabrication names. MEC ranks #4 (4.5% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	CRS	Carpenter Technology Corp	506,167	$312,224,051
2	CMC	COMMERCIAL METALS Co	435,750	$27,343,311
3	GPGI	GPGI, Inc.	1,396,698	$22,137,663
4	MEC	Mayville Engineering Company, Inc. This page	477,583	$17,890,257
5	ATI	Ati Inc	81,401	$16,044,136
6	MLI	Mueller Industries Inc	31,198	$1,917,585

10 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$17,890,257	477,583	+102.9%	Shares	Defined	2026-08-14
2022-03-31	$2,205,276	235,355	-22.8%	Shares	Defined	2022-05-16
2021-12-31	$4,547,520	304,998	-24.9%	Shares	Defined	2022-02-11
2021-09-30	$7,637,537	406,252	-72.2%	Shares	Defined	2021-11-15
2021-06-30	$29,402,407	1,462,079	+8.4%	Shares	Defined	2021-08-16
2021-03-31	$19,402,386	1,349,262	+6.7%	Shares	Defined	2021-05-17
2020-12-31	$16,963,550	1,264,050	+14.9%	Shares	Defined	2021-02-12
2020-09-30	$10,113,740	1,100,516	+69.4%	Shares	Defined	2020-11-16
2020-06-30	$5,131,348	649,538	+37.7%	Shares	Defined	2020-08-14
2020-03-31	$2,892,003	471,779	—	Shares	Defined	2020-05-14
No filing history on record for this holder in this stock.