Who Owns MAYVILLE ENGR CO INC (MEC)? -- Institutional Holders (2026-06-30)

177 institutions reported holding $819.0M of MAYVILLE ENGR CO INC (MEC) in SEC 13F filings for 2026-06-30. Largest institutional holders: Portolan Capital Management, LLC ($48.7M), FMR LLC ($48.0M), BlackRock, Inc. ($44.3M), Allspring Global Investments Holdings, LLC ($37.8M), VANGUARD GROUP INC ($35.5M). Source: SEC Form 13F.

Rank	Institution	Value	Shares	Change
1	Portolan Capital Management, LLC	$48.7M	1.3M	Added
2	FMR LLC	$48.0M	1.3M	Added
3	BlackRock, Inc.	$44.3M	1.2M	Added
4	Allspring Global Investments Holdings, LLC	$37.8M	1.1M	Trimmed
5	VANGUARD GROUP INC	$35.5M	948,711	Added
6	Driehaus Capital Management LLC	$31.7M	846,354	New
7	SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC	$30.0M	800,000	New
8	DIMENSIONAL FUND ADVISORS LP	$29.3M	782,276	Trimmed
9	ROYCE & ASSOCIATES LP	$28.2M	752,083	Added
10	Boston Partners	$25.8M	696,429	Added
11	Jupiter Topco LLC	$21.5M	575,278	New
12	BLAIR WILLIAM & CO/IL	$20.5M	546,714	Trimmed
13	WELLINGTON MANAGEMENT GROUP LLP	$17.9M	477,583	New
14	EVR Research LP	$16.6M	441,908	Trimmed
15	JANE STREET GROUP, LLC	$15.1M	403,351	New
16	GEODE CAPITAL MANAGEMENT, LLC	$14.0M	374,578	Added
17	First Eagle Investment Management, LLC	$13.8M	369,575	Trimmed
18	SUSQUEHANNA INTERNATIONAL GROUP, LLP	$13.5M	361,462	New
19	JPMORGAN CHASE & CO	$13.0M	347,224	Added
20	KENNEDY CAPITAL MANAGEMENT LLC	$12.6M	336,377	Added
21	Ophir Asset Management Pty Ltd	$12.2M	326,699	New
22	Granahan Investment Management, LLC	$12.1M	324,108	Trimmed
23	SILVERCREST ASSET MANAGEMENT GROUP LLC	$11.8M	313,943	Added
24	STATE STREET CORP	$10.9M	291,168	Added
25	Nuveen, LLC	$10.6M	281,914	Added

Source: SEC Form 13F filings · as of 2026-06-30