13F Insight
DOSSIER · 13F Holders · Q1 2026Cheap mega-capRe-rated
OSBC

OLD SECOND BANCORP INC ILL

200 institutions still hold OLD SECOND BANCORP INC ILL as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 680277100·200 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 7.6%
vs prior quarter
13F value held
$571M
71.0% inst. owned
of float
Holders
200
-72 QoQ
filers reporting
Activity
+27 / −41
+895 added · −719 reduced
this quarter
Concentration
14.56%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

200 institutions reported OSBC in Q1 2026. BlackRock, Inc. leads at 14.6% of the visible book. -72 net institutions QoQ — distribution reading.

Top holders

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

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$83M4.1M0.00%Q1 202602
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$48M2.4M0.01%Q1 202603
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$45M2.3M0.00%Q1 202604
Davis Asset Management, L.P.
CIK 0001945894
$36M1.8M1.05%Q1 202605
FJ Capital Management LLC
CIK 0001599170
$36M1.8M3.94%Q4 202506
GOLDMAN SACHS GROUP INC
CIK 0000886982
$34M1.7M0.00%Q1 202607
STATE STREET CORP
CIK 0000093751
$32M1.6M0.00%Q1 202608
AMERICAN CENTURY COMPANIES INC
CIK 0000748054
$32M1.6M0.02%Q1 202609
Boston Partners
CIK 0001386060
$29M1.4M0.03%Q1 202610
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$26M1.3M0.00%Q1 202611
KENNEDY CAPITAL MANAGEMENT LLC
CIK 0000884589
$26M1.3M0.54%Q1 202612
BANC FUNDS CO LLC
CIK 0001029311
$21M1.0M3.86%Q1 202613
MANUFACTURERS LIFE INSURANCE COMPANY, THE
CIK 0000928047
$18M879K0.02%Q1 202614
WELLINGTON MANAGEMENT GROUP LLP
CIK 0000902219
$17M858K0.00%Q1 202615
Stieven Capital Advisors, L.P.
CIK 0001388279
$16M774K3.33%Q1 202616
NORTHERN TRUST CORP
CIK 0000073124· Index
$15M764K0.00%Q1 202617
River Street Advisors LLC
CIK 0001964897
$15M747K5.09%Q1 202618
Vanguard Portfolio Management
CIK 0002100121
$14M712K0.00%Q1 202619
JPMORGAN CHASE & CO
CIK 0000019617
$14M701K0.00%Q1 202620
ALLIANCEBERNSTEIN L.P.
CIK 0001109448
$13M691K0.00%Q1 2026
Page 1 of 10
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