13F Insight
DOSSIER · 13F Holders · Q1 2026Defensive growthQuality
MEC

MAYVILLE ENGR CO INC

126 institutions still hold MAYVILLE ENGR CO INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 578605107·126 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 0.5%
vs prior quarter
13F value held
$188M
54.0% inst. owned
of float
Holders
126
-49 QoQ
filers reporting
Activity
+31 / −49
+1,028 added · −968 reduced
this quarter
Concentration
19.11%
Allspring Global Investments Holdings, LLC #1
top holder share
AI Holders Summary · Q1 2026

126 institutions reported MEC in Q1 2026. Allspring Global Investments Holdings, LLC leads at 19.1% of the visible book. -49 net institutions QoQ — distribution reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
Allspring Global Investments Holdings, LLC
CIK 0001890906
$36M2.0M0.06%Q1 202602
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$17M926K0.00%Q1 202603
BlackRock, Inc.
CIK 0002012383
$16M882K0.00%Q1 202604
ROYCE & ASSOCIATES LP
CIK 0000906304
$13M751K0.13%Q1 202605
EVR Research LP
CIK 0001843019
$11M620K4.45%Q1 202606
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$11M595K0.00%Q1 202607
BLAIR WILLIAM & CO/IL
CIK 0000902367
$10M565K0.03%Q1 202608
Portolan Capital Management, LLC
CIK 0001350290
$10M513K0.51%Q4 202509
First Eagle Investment Management, LLC
CIK 0001325447
$7M404K0.01%Q1 202610
Granahan Investment Management, LLC
CIK 0001026710
$7M387K0.34%Q1 202611
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$7M381K0.00%Q1 202612
AMERIPRISE FINANCIAL INC
CIK 0000820027
$6M352K0.00%Q1 202613
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$6M336K0.00%Q1 202614
STATE STREET CORP
CIK 0000093751
$5M286K0.00%Q1 202615
SILVERCREST ASSET MANAGEMENT GROUP LLC
CIK 0001232395
$5M270K0.04%Q1 202616
JB CAPITAL PARTNERS LP
CIK 0001138532
$4M251K0.77%Q1 202617
Congruence Capital, LLC
CIK 0002085569
$4M234K1.41%Q1 202618
Boston Partners
CIK 0001386060
$4M233K0.00%Q1 202619
BRIDGEWAY CAPITAL MANAGEMENT, LLC
CIK 0001107261
$4M223K0.08%Q1 202620
AMERICAN CENTURY COMPANIES INC
CIK 0000748054
$4M222K0.00%Q1 2026
Page 1 of 7
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