Mayville Engineering Company MEC Institutional Ownership

NYSE MEC

$14.56 +0.66 (+4.79%)

As of: Oct 21, 2026 · 2:35 PM EDT

Institutions by Trading Activity

156 Institutions

Increased 98 62.8%

Unchanged 18 11.5%

Reduced 40 25.6%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

83.05%

▲+12.78 pp QoQ

Shares Held by Institutions

21.18Mn

of 25.50Mn outstanding

▲+47.05% QoQ

Shares Outstanding

25.50Mn

4.32Mn held outside 13F filers

Institutional Investors

156

filed 13F for Jun 2026

▲+32 vs prior quarter

Net Shares Added (QoQ)

+6.78Mn

accumulated since last quarter

Value of Holdings

$293.96Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Updated Oct 11, 2026

Mayville Engineering Company, Inc. (NYSE:MEC) was reported as a holding by 156 institutional investors in 13F filings for the quarter ended June 30, 2026.

Their combined stake equaled 83.05% of outstanding shares in Q2 2026, up from 70.27% in Q1 2026.
Total holdings of Mayville Engineering Company shares rose 47.05% from Q1 2026, and the number of holders rose 43.12% from Q2 2025.
Of these 156 holders, 98 added to their positions, 40 reduced their stakes and 18 left their positions unchanged.
Combined, institutional investors held 21.18Mn shares of MEC as of Q2 2026, up 6.78Mn from the prior quarter and up 8.61Mn from a year earlier.
As of June 30, 2026, the biggest holder of Mayville Engineering Company was Portolan Capital Management, LLC with 1.3Mn shares, or 5.10% of shares outstanding.
Among holders that already owned Mayville Engineering Company, the biggest buyers in Q2 2026 were FMR LLC (+1.28Mn shares), Portolan Capital Management, LLC (+478.12K shares), Boston Partners (+463.79K shares), JPMorgan Chase & Co (+341.74K shares) and BlackRock, Inc. (+301.59K shares).
Among holders that kept a stake in Mayville Engineering Company, the biggest sellers in Q2 2026 were Allspring Global Investments Holdings, LLC (-927.43K shares), EVR Research LP (-178.09K shares), American Century Companies Inc (-173.46K shares), Dimensional Fund Advisors LP (-143.94K shares) and Millennium Management LLC (-127.3K shares).
Mayville Engineering Company's 10 largest institutional shareholders as of Q2 2026 were Portolan Capital Management, LLC (1.3Mn shares), FMR LLC (1.28Mn shares), BlackRock, Inc. (1.18Mn shares), Allspring Global Investments Holdings, LLC (1.07Mn shares), Driehaus Capital Management LLC (846.35K shares), Summit Partners Public Asset Management, LLC (800K shares), Dimensional Fund Advisors LP (782.28K shares), Royce & Associates LP (752.08K shares), Vanguard Capital Management LLC (743.62K shares) and Boston Partners (696.43K shares), per Business Quant data.

Form 13F Holdings

156 Institutional Holders

Report period 30 Jun, 2026

Total shares held 21.18Mn

Of outstanding 83.05%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	Portolan Capital Management, LLC	0001350290	1,299,256	5.10%	▲478,120	+58.23%	$48.67Mn
2	FMR LLC	0000315066	1,280,170	5.02%	▲1,275,909	+29,943.89%	$47.96Mn
3	BlackRock, Inc.	0002012383	1,183,443	4.64%	▲301,589	+34.20%	$44.33Mn
4	Allspring Global Investments Holdings, LLC	0001890906	1,072,916	4.21%	▼927,434	-46.36%	$37.78Mn
5	DRIEHAUS CAPITAL MANAGEMENT LLC	0000938206	846,354	3.32%	▲846,354	0.00%	$31.70Mn
6	SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC	0001638555	800,000	3.14%	▲800,000	0.00%	$29.97Mn
7	DIMENSIONAL FUND ADVISORS LP	0000354204	782,276	3.07%	▼143,940	-15.54%	$29.30Mn
8	ROYCE & ASSOCIATES LP	0000906304	752,083	2.95%	▲1,082	+0.14%	$28.17Mn
9	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	743,621	2.92%	▲148,683	+24.99%	$27.86Mn
10	Boston Partners	0001386060	696,429	2.73%	▲463,792	+199.36%	$25.81Mn
11	Jupiter Topco LLC	0002146052	575,278	2.26%	▲575,278	0.00%	$21.55Mn
12	BLAIR WILLIAM & CO/IL	0000902367	546,714	2.14%	▼18,586	-3.29%	$20.48Mn
13	WELLINGTON MANAGEMENT GROUP LLP	0000902219	477,583	1.87%	▲477,583	0.00%	$17.89Mn
14	EVR Research LP	0001843019	441,908	1.73%	▼178,092	-28.72%	$16.55Mn
15	GEODE CAPITAL MANAGEMENT, LLC	0001214717	374,578	1.47%	▲38,743	+11.54%	$14.04Mn
16	First Eagle Investment Management, LLC	0001325447	369,575	1.45%	▼34,500	-8.54%	$13.84Mn
17	JANE STREET GROUP, LLC	0001595888	356,151	1.40%	▲356,151	0.00%	$13.34Mn
18	Jpmorgan Chase & Co	0000019617	347,224	1.36%	▲341,743	+6,235.05%	$13.03Mn
19	KENNEDY CAPITAL MANAGEMENT LLC	0000884589	336,377	1.32%	▲229,586	+214.99%	$12.60Mn
20	Ophir Asset Management Pty Ltd	0001844640	326,699	1.28%	▲326,699	0.00%	$12.24Mn

Showing 1 to 20 of 156 holders