13F Insight
DOSSIER · 13F Holders · Q1 2026CyclicalNet sold
MPX

MARINE PRODS CORP

78 institutions still hold MARINE PRODS CORP as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 568427108·78 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 7.8%
vs prior quarter
13F value held
$39M
71.0% inst. owned
of float
Holders
78
-118 QoQ
filers reporting
Activity
+99 / −33
+935 added · −816 reduced
this quarter
Concentration
14.14%
DIMENSIONAL FUND ADVISORS LP #1
top holder share
AI Holders Summary · Q1 2026

78 institutions reported MPX in Q1 2026. DIMENSIONAL FUND ADVISORS LP leads at 14.1% of the visible book. -118 net institutions QoQ — distribution reading.

Top holders

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

#HolderValueShares% port.Quarter
01
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$6M768K0.00%Q1 202602
BlackRock, Inc.
CIK 0002012383
$5M626K0.00%Q1 202603
GAMCO INVESTORS, INC. ET AL
CIK 0000807249
$4M509K0.04%Q1 202604
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$3M450K0.00%Q1 202605
DEPRINCE RACE & ZOLLO INC
CIK 0001008894
$3M446K0.06%Q1 202606
Russell Investments Group, Ltd.
CIK 0001692234
$3M388K0.00%Q1 202607
De Lisle Partners LLP
CIK 0002011184
$3M364K0.32%Q1 202608
Teton Advisors, Inc.
CIK 0001444874
$2M244K1.26%Q2 202509
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$2M261K0.00%Q1 202610
GABELLI FUNDS LLC
CIK 0001081407
$2M233K0.01%Q1 202611
Teton Advisors, LLC
CIK 0002086025
$2M223K1.14%Q1 202612
STATE STREET CORP
CIK 0000093751
$1M181K0.00%Q1 202613
Bank of New York Mellon Corp
CIK 0001390777
$1M159K0.00%Q1 202614
K2 PRINCIPAL FUND, L.P.
CIK 0001461790
$873,970120K0.06%Q1 202615
NORTHERN TRUST CORP
CIK 0000073124· Index
$624,02886K0.00%Q1 202616
HANOVER ADVISORS INC
CIK 0000914973
$568,04178K0.23%Q1 202617
VANGUARD FIDUCIARY TRUST CO
CIK 0000933478· Index
$523,19372K0.00%Q1 202618
RENAISSANCE TECHNOLOGIES LLC
CIK 0001037389
$479,83566K0.00%Q1 202619
ABC ARBITRAGE SA
CIK 0002049221
$451,22762K0.06%Q1 202620
AMERICAN CENTURY COMPANIES INC
CIK 0000748054
$395,74254K0.00%Q1 2026
Page 1 of 4
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