Mayville Engineering Company MEC Institutional Ownership

NYSE MEC

$15.18 -1.14 (-6.99%)

As of: Sep 30, 2026 · 3:19 PM EDT

Institutions by Trading Activity

157 Institutions

Increased 99 63.1%

Unchanged 18 11.5%

Reduced 40 25.5%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

93.22%

▲+22.78 pp QoQ

Shares Held by Institutions

21.22Mn

of 22.77Mn outstanding

▲+59.02% QoQ

Shares Outstanding

22.77Mn

1.54Mn held outside 13F filers

Institutional Investors

157

filed 13F for Jun 2026

▲+33 vs prior quarter

Net Shares Added (QoQ)

+7.88Mn

accumulated since last quarter

Value of Holdings

$347.02Mn

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

Quarter ending 30 Jun, 2026

Mayville Engineering Company, Inc. (NYSE:MEC) has 157 institutional investors that have filed 13F reports for the period ending June 2026.

Their combined ownership stood at 93.2% of outstanding shares in June 2026, up from 70.4% in March 2026.
Their total shares held in MEC increased 59.02% from the prior quarter, while the number of investors in Mayville Engineering Company increased 41.44% year over year.
Among the 157 funds, 99 bought more Mayville Engineering Company shares, 40 sold down, and 18 held their ground.
Combined, these investors held 21.22Mn shares in MEC for June 2026, up by 7.88Mn shares quarter on quarter, and up 8.66Mn shares year over year.
As of June 30, 2026, Portolan Capital Management, LLC held the largest stake in Mayville Engineering Company with 1.3Mn shares, accounting for 5.71% of total shares outstanding.
The most significant purchases of MEC for the quarter ending June 2026 came from FMR LLC (1.28Mn), DRIEHAUS CAPITAL MANAGEMENT LLC (846.35K), SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC (800.0K), Jupiter Topco LLC (575.28K), Portolan Capital Management, LLC (478.12K).
The biggest sellers of Mayville Engineering Company for the quarter ending June 2026 included Allspring Global Investments Holdings, LLC (927.43K), EVR Research LP (178.09K), AMERICAN CENTURY COMPANIES INC (173.46K), DIMENSIONAL FUND ADVISORS LP (143.94K), MILLENNIUM MANAGEMENT LLC (127.3K).
Per Business Quant, the top 10 investors in MEC for the quarter ending June 2026 include Portolan Capital Management, LLC (1.3Mn), FMR LLC (1.28Mn), BlackRock, Inc. (1.18Mn), Allspring Global Investments Holdings, LLC (1.07Mn), DRIEHAUS CAPITAL MANAGEMENT LLC (846.35K), SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC (800.0K), DIMENSIONAL FUND ADVISORS LP (782.28K), ROYCE & ASSOCIATES LP (752.08K), VANGUARD CAPITAL MANAGEMENT LLC (743.62K), Boston Partners (696.43K).

Form 13F Holdings

157 Institutional Holders

Report period 30 Jun, 2026

Total shares held 21.22Mn

Of outstanding 93.22%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	Portolan Capital Management, LLC	0001350290	1,299,256	5.71%	▲478,120	+58.23%	$48.67Mn
2	FMR LLC	0000315066	1,280,170	5.62%	▲1,275,909	+29,943.89%	$47.96Mn
3	BlackRock, Inc.	0002012383	1,183,443	5.20%	▲301,589	+34.20%	$44.33Mn
4	Allspring Global Investments Holdings, LLC	0001890906	1,072,916	4.71%	▼927,434	-46.36%	$37.78Mn
5	DRIEHAUS CAPITAL MANAGEMENT LLC	0000938206	846,354	3.72%	▲846,354	0.00%	$31.70Mn
6	SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC	0001638555	800,000	3.51%	▲800,000	0.00%	$29.97Mn
7	DIMENSIONAL FUND ADVISORS LP	0000354204	782,276	3.44%	▼143,940	-15.54%	$29.30Mn
8	ROYCE & ASSOCIATES LP	0000906304	752,083	3.30%	▲1,082	+0.14%	$28.17Mn
9	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	743,621	3.27%	▲148,683	+24.99%	$27.86Mn
10	Boston Partners	0001386060	696,429	3.06%	▲463,792	+199.36%	$25.81Mn
11	Jupiter Topco LLC	0002146052	575,278	2.53%	▲575,278	0.00%	$21.55Mn
12	BLAIR WILLIAM & CO/IL	0000902367	546,714	2.40%	▼18,586	-3.29%	$20.48Mn
13	WELLINGTON MANAGEMENT GROUP LLP	0000902219	477,583	2.10%	▲477,583	0.00%	$17.89Mn
14	EVR Research LP	0001843019	441,908	1.94%	▼178,092	-28.72%	$16.55Mn
15	GEODE CAPITAL MANAGEMENT, LLC	0001214717	374,578	1.65%	▲38,743	+11.54%	$14.04Mn
16	First Eagle Investment Management, LLC	0001325447	369,575	1.62%	▼438,575	-54.27%	$13.84Mn
17	JANE STREET GROUP, LLC	0001595888	356,151	1.56%	▲356,151	0.00%	$13.34Mn
18	Jpmorgan Chase & Co	0000019617	347,224	1.53%	▲341,743	+6,235.05%	$13.03Mn
19	KENNEDY CAPITAL MANAGEMENT LLC	0000884589	336,377	1.48%	▲229,586	+214.99%	$12.60Mn
20	Ophir Asset Management Pty Ltd	0001844640	326,699	1.43%	▲326,699	0.00%	$12.24Mn

Showing 1 to 20 of 157 holders