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Old Second Bancorp
OSBC

185 hedge funds and large institutions have $725M invested in Old Second Bancorp in 2025 Q4 according to their latest regulatory filings, with 22 funds opening new positions, 78 increasing their positions, 59 reducing their positions, and 30 closing their positions.

New
Increased
Maintained
Reduced
Closed

32% more repeat investments, than reductions

Existing positions increased: 78 | Existing positions reduced: 59

16% more capital invested

Capital invested by funds: $624M → $725M (+$100M)

1.95% more ownership

Funds ownership: 68.61% → 70.56% (+1.9%)

6% less funds holding

Funds holding: 197 → 185 (-12)

20% less funds holding in top 10

Funds holding in top 10: 5 → 4 (-1)

27% less first-time investments, than exits

New positions opened: 22 | Existing positions closed: 30

Holders
185
Holders Change
-12
Holders Change %
-6.09%
% of All Funds
2.25%
Holding in Top 10
4
Holding in Top 10 Change
-1
Holding in Top 10 Change %
-20%
% of All Funds
0.05%
New
22
Increased
78
Reduced
59
Closed
30
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

1
Boston Partners
Boston Partners
Massachusetts
+$15.3M
2
Wellington Management Group
Wellington Management Group
Massachusetts
+$15.2M
3
BlackRock
BlackRock
New York
+$6.32M
4
Millennium Management
Millennium Management
New York
+$5.86M
5
DAM
Davis Asset Management
California
+$4.59M

Top Sellers

1
Goldman Sachs
Goldman Sachs
New York
-$5.52M
2
Qube Research & Technologies (QRT)
Qube Research & Technologies (QRT)
United Kingdom
-$3.76M
3
JAM
Jacobs Asset Management
New York
-$3.68M
4
EF
Empowered Funds
Pennsylvania
-$3.43M
5
LSV Asset Management
LSV Asset Management
Illinois
-$3.34M
Name Holding Trade Value Shares
Change 		Change in
Stake
MF
201
Magnetar Financial
Illinois
– -$413K -23,901 Closed
Jane Street
202
Jane Street
New York
– -$386K -22,309 Closed
Tudor Investment Corp
203
Tudor Investment Corp
Connecticut
– -$376K -21,772 Closed
JAM
204
Jupiter Asset Management
United Kingdom
– -$337K -19,522 Closed
PAP
205
Persistent Asset Partners
Hong Kong
– -$314K -18,182 Closed
Jacobs Levy Equity Management
206
Jacobs Levy Equity Management
New Jersey
– -$301K -17,409 Closed
FL
207
Fourthstone LLC
Missouri
– -$216K -12,500 Closed
D.E. Shaw & Co
208
D.E. Shaw & Co
New York
– -$210K -12,166 Closed
Susquehanna International Group
209
Susquehanna International Group
Pennsylvania
– -$195K -11,273 Closed
GCP
210
GSA Capital Partners
United Kingdom
– -$188K -10,881 Closed
SO
211
STRS Ohio
Ohio
– -$181K -10,500 Closed
WANY
212
Wealthspire Advisors (New York)
New York
– -$101K -5,844 Closed
MG
213
Mather Group
Illinois
– -$66.9K -3,872 Closed
TF
214
Tompkins Financial
New York
– -$19.8K -1,145 Closed
VWM
215
Valley Wealth Managers
New Jersey
– -$12 -1 Closed
5 6 7 8
9

OSBC Hedge Fund Activity: Q4 2025 in Review

185 of the 8,223 institutional investors tracked by Wall St. Rank reported a position in Old Second Bancorp (OSBC) for Q4 2025, worth a combined $725M — up 16% from $624M a quarter earlier.

Sellers outnumbered buyers: 30 funds closed out of OSBC and 22 opened new positions — a net loss of 8 holders — while 59 trimmed existing stakes and 78 added.

The largest buyer was Boston Partners, opening a new position worth an estimated $15.3M. The largest seller was Goldman Sachs, cutting an estimated $5.52M.

  • 185 institutional investors held Old Second Bancorp (OSBC) as of Q4 2025, down from 197 in Q3 2025.
  • Funds reported $725M of Old Second Bancorp stock for Q4 2025, up 16% quarter-over-quarter.
  • 22 funds opened new Old Second Bancorp positions in Q4 2025 and 30 closed out, a net change of -8 holders.
  • The largest Old Second Bancorp buyer in Q4 2025 was Boston Partners, an estimated $15.3M added.
  • The largest Old Second Bancorp seller in Q4 2025 was Goldman Sachs, an estimated $5.52M sold.

Based on aggregated 13F filings for Q4 2025.