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Old Second Bancorp
OSBC

188 hedge funds and large institutions have $761M invested in Old Second Bancorp in 2026 Q1 according to their latest regulatory filings, with 25 funds opening new positions, 59 increasing their positions, 65 reducing their positions, and 17 closing their positions.

New
Increased
Maintained
Reduced
Closed

47% more first-time investments, than exits

New positions opened: 25 | Existing positions closed: 17

5% more capital invested

Capital invested by funds: $725M → $761M (+$36.5M)

2% more funds holding

Funds holding: 185 → 188 (+3)

1.15% more ownership

Funds ownership: 70.56% → 71.71% (+1.1%)

0% more funds holding in top 10

Funds holding in top 10: 4 → 4 (0)

9% less repeat investments, than reductions

Existing positions increased: 59 | Existing positions reduced: 65

Holders
188
Holders Change
+3
Holders Change %
+1.62%
% of All Funds
2.31%
Holding in Top 10
4
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.05%
New
25
Increased
59
Reduced
65
Closed
17
Calls
$4K
Puts
–
Net Calls
+$4K
Net Calls Change
+$4K

Top Buyers

1
Boston Partners
Boston Partners
Massachusetts
+$12.6M
2
Goldman Sachs
Goldman Sachs
New York
+$8.59M
3
RSA
River Street Advisors
Illinois
+$7.64M
4
EF
Empowered Funds
Pennsylvania
+$4.69M
5
Dimensional Fund Advisors
Dimensional Fund Advisors
Texas
+$2.57M

Top Sellers

1
FCM
FJ Capital Management
Virginia
-$6.51M
2
Millennium Management
Millennium Management
New York
-$5.66M
3
Adage Capital Partners
Adage Capital Partners
Massachusetts
-$4.74M
4
JP Morgan Chase
JP Morgan Chase
New York
-$3.17M
5
JAM
Jacobs Asset Management
New York
-$2.64M
Name Holding Trade Value Shares
Change 		Change in
Stake
Fisher Asset Management
51
Fisher Asset Management
Washington
$1.96M – – –
SBF
52
Sara-Bay Financial
Florida
$1.9M -$100K -5,000 -5%
Renaissance Technologies
53
Renaissance Technologies
New York
$1.82M +$78.2K +3,900 +5%
Franklin Resources
54
Franklin Resources
California
$1.78M +$1.77M +88,166 New
MAM
55
Martingale Asset Management
Massachusetts
$1.76M -$466K -23,244 -21%
Barclays
56
Barclays
United Kingdom
$1.75M -$1.13M -56,186 -39%
HSBC Holdings
57
HSBC Holdings
United Kingdom
$1.72M +$102K +5,078 +6%
MCA
58
MSH Capital Advisors
Arizona
$1.71M – – –
Invesco
59
Invesco
Georgia
$1.65M +$21.4K +1,067 +1%
Principal Financial Group
60
Principal Financial Group
Iowa
$1.51M +$508K +25,308 +51%
JC
61
JCSD Capital
California
$1.49M – – –
UBS AM
62
UBS AM
Illinois
$1.36M +$56K +2,791 +4%
Two Sigma Investments
63
Two Sigma Investments
New York
$1.36M +$697K +34,758 +107%
RhumbLine Advisers
64
RhumbLine Advisers
Massachusetts
$1.33M -$17.6K -879 -1%
Citadel Advisors
65
Citadel Advisors
Florida
$1.21M -$145K -7,248 -11%
YIH
66
Y-Intercept (HK)
Hong Kong
$1.06M +$1.05M +52,576 New
IC
67
IEQ Capital
California
$1.06M -$95.5K -4,758 -8%
Jane Street
68
Jane Street
New York
$1.04M +$1.03M +51,428 New
QCM
69
Quantinno Capital Management
New York
$1.01M +$370K +18,461 +59%
Creative Planning
70
Creative Planning
Kansas
$946K -$5.22K -260 -0.6%
California State Teachers Retirement System (CalSTRS)
71
California State Teachers Retirement System (CalSTRS)
California
$943K -$7.54K -376 -0.8%
Deutsche Bank
72
Deutsche Bank
Germany
$937K +$106K +5,290 +13%
HPCM
73
Hunter Perkins Capital Management
Illinois
$931K +$7.3K +364 +0.8%
Wealth Enhancement Advisory Services
74
Wealth Enhancement Advisory Services
Minnesota
$887K +$289K +14,420 +51%
HighTower Advisors
75
HighTower Advisors
Illinois
$884K -$3.01K -150 -0.3%
1 2
3
4 5

OSBC Hedge Fund Activity: Q1 2026 in Review

188 of the 8,125 institutional investors tracked by Wall St. Rank reported a position in Old Second Bancorp (OSBC) for Q1 2026, worth a combined $761M — up 5% from $725M a quarter earlier.

Buyers outnumbered sellers: 25 funds opened new OSBC positions and 17 closed out — a net gain of 8 holders — while 59 added to existing stakes and 65 trimmed.

The largest buyer was Boston Partners, adding an estimated $12.6M. The largest seller was FJ Capital Management, cutting an estimated $6.51M.

  • 188 institutional investors held Old Second Bancorp (OSBC) as of Q1 2026, up from 185 in Q4 2025.
  • Funds reported $761M of Old Second Bancorp stock for Q1 2026, up 5% quarter-over-quarter.
  • 25 funds opened new Old Second Bancorp positions in Q1 2026 and 17 closed out, a net change of +8 holders.
  • The largest Old Second Bancorp buyer in Q1 2026 was Boston Partners, an estimated $12.6M added.
  • The largest Old Second Bancorp seller in Q1 2026 was FJ Capital Management, an estimated $6.51M sold.

Based on aggregated 13F filings for Q1 2026.