Company · Ownership research

Mayville Engineering Company, Inc. MEC

CIK 0001766368 · CUSIP 578605107

Insider tradingInitial holdingsInstitutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 578605107 (MEC), not CUSIP 578605907 (MEC), CUSIP 578605957 (MEC), and does not merge CUSIPs.

This page lists the top 20 of 114 rows by value; the complete set is available through the API.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	Allspring Global Investments Holdings, LLC CIK 1890906 · View history	$39.77M 2,446,090 shares	0.07%	+5.01K(+0.20%)Added	SEC filing ↗ Jul 25, 2025	▾
02	BlackRock, Inc. CIK 2012383 · View history	$14.57M 913,189 shares	0.00%	+63.60K(+7.50%)Added	SEC filing ↗ Aug 12, 2025	▾
03	VANGUARD GROUP INC CIK 102909 · View history	$14.08M 882,195 shares	0.00%	+266.05K(+43.20%)Added	SEC filing ↗ Aug 11, 2025	▾
04	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$12.99M 814,034 shares	0.00%	+41.47K(+5.40%)Added	SEC filing ↗ Aug 12, 2025	▾
05	TOCQUEVILLE ASSET MANAGEMENT L.P. CIK 883961 · View history	$9.12M 571,187 shares	0.14%	-50.02K(-8.10%)Reduced	SEC filing ↗ Aug 12, 2025	▾
06	ROYCE & ASSOCIATES LP CIK 906304 · View history	$8.92M 558,849 shares	0.09%	-32.47K(-5.50%)Reduced	SEC filing ↗ Aug 11, 2025	▾
07	Granahan Investment Management, LLC CIK 1026710 · View history	$7.95M 498,305 shares	0.32%	+20.27K(+4.20%)Added	SEC filing ↗ Aug 14, 2025	▾
08	BLAIR WILLIAM & CO/IL CIK 902367 · View history	$5.96M 373,448 shares	0.02%	+281.20K(+304.80%)Added	SEC filing ↗ Jul 24, 2025	▾
09	Ancora Advisors LLC CIK 1446114 · View history	$5.74M 359,780 shares	0.12%	+50.20K(+16.20%)Added	SEC filing ↗ Aug 14, 2025	▾
10	First Eagle Investment Management, LLC CIK 1325447 · View history	$5.65M 354,075 shares	0.01%	+2.20K(+0.60%)Added	SEC filing ↗ Aug 6, 2025	▾
11	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$5.08M 318,321 shares	0.00%	+27.55K(+9.50%)Added	SEC filing ↗ Aug 8, 2025	▾
12	AMERICAN CENTURY COMPANIES INC CIK 748054 · View history	$4.90M 306,982 shares	0.00%	+54.84K(+21.80%)Added	SEC filing ↗ Aug 12, 2025	▾
13	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP CIK 1164508 · View history	$4.29M 268,635 shares	0.00%	+2.23K(+0.80%)Added	SEC filing ↗ Aug 13, 2025	▾
14	STATE STREET CORP CIK 93751 · View history	$4.23M 265,050 shares	0.00%	+12.68K(+5.00%)Added	SEC filing ↗ Aug 14, 2025	▾
15	JB CAPITAL PARTNERS LP CIK 1138532 · View history	$4.00M 250,512 shares	0.74%	0(0.00%)Unchanged	SEC filing ↗ Aug 13, 2025	▾
16	BANK OF AMERICA CORP /DE/ CIK 70858 · View history	$3.63M 227,699 shares	0.00%	-12.53K(-5.20%)Reduced	SEC filing ↗ Aug 14, 2025	▾
17	BRIDGEWAY CAPITAL MANAGEMENT, LLC CIK 1107261 · View history	$3.55M 222,654 shares	0.08%	+9.78K(+4.60%)Added	SEC filing ↗ Aug 14, 2025	▾
18	Russell Investments Group, Ltd. CIK 1692234 · View history	$3.45M 216,179 shares	0.00%	+15.87K(+7.90%)Added	SEC filing ↗ Aug 13, 2025	▾
19	22NW, LP CIK 1694297 · View history	$2.48M 155,450 shares	1.56%	+155.45KNew	SEC filing ↗ Aug 14, 2025	▾
20	RENAISSANCE TECHNOLOGIES LLC CIK 1037389 · View history	$2.30M 144,000 shares	0.00%	+58.10K(+67.60%)Added	SEC filing ↗ Aug 13, 2025	▾

Showing 20 / 114 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

114

Cancelled or null records excluded

Disclosed shares

12,642,223

Not deduplicated across managers

Disclosed value

$202.52M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Mayville Engineering Company, Inc. · Q2 2025

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{"action":"holders","cusip":"578605107","quarter":"2025Q2","type":"positions","page_size":100}

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.