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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
Bank of New York Mellon
26
Bank of New York Mellon
New York
$6.8M -$141K -7,028 -2%
VFT
27
Vanguard Fiduciary Trust
Pennsylvania
$6.76M +$6.73M +335,483 New
Bank of America
28
Bank of America
North Carolina
$6.68M -$226K -11,249 -3%
Morgan Stanley
29
Morgan Stanley
New York
$5.61M -$195K -9,735 -3%
UBS Group
30
UBS Group
Switzerland
$5.23M +$1.65M +82,172 +46%
EF
31
Empowered Funds
Pennsylvania
$4.71M +$4.69M +233,559 New
FFM
32
Forum Financial Management
Illinois
$4.15M -$64.7K -3,223 -2%
SEI Investments
33
SEI Investments
Pennsylvania
$4.09M +$1.73M +86,057 +74%
GLA
34
Great Lakes Advisors
Illinois
$3.99M +$614K +30,619 +18%
Squarepoint
35
Squarepoint
New York
$3.44M +$2.45M +122,179 +252%
EPCA
36
Elizabeth Park Capital Advisors
Ohio
$3.36M +$156K +7,800 +5%
SCP
37
Siena Capital Partners
Illinois
$3.29M – – –
William Blair & Company
38
William Blair & Company
Illinois
$3.28M +$174K +8,664 +6%
EC
39
EJF Capital
Virginia
$3.05M +$42K +2,094 +1%
JAM
40
Jacobs Asset Management
New York
$3.02M -$2.64M -131,477 -47%
Thrivent Financial for Lutherans
41
Thrivent Financial for Lutherans
Minnesota
$2.88M – – –
Arrowstreet Capital
42
Arrowstreet Capital
Massachusetts
$2.84M -$1.51M -75,485 -35%
Victory Capital Management
43
Victory Capital Management
Texas
$2.8M -$314K -15,661 -10%
KOCAA
44
Knights of Columbus Asset Advisors
Connecticut
$2.65M -$30.2K -1,504 -1%
State of New Jersey Common Pension Fund D
45
State of New Jersey Common Pension Fund D
New Jersey
$2.61M – – –
Bank of Montreal
46
Bank of Montreal
Ontario, Canada
$2.39M -$417K -20,787 -15%
Russell Investments Group
47
Russell Investments Group
United Kingdom
$2.26M -$3.45K -172 -0.2%
CRC
48
Curi RMB Capital
Illinois
$2.03M – – –
MCA
49
Mendon Capital Advisors
Florida
$2.02M – – –
Swiss National Bank
50
Swiss National Bank
Switzerland
$1.99M – – –
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.