Old Second Bancorp
OSBC
184 hedge funds and large institutions have $903M invested in Old Second Bancorp in 2026 Q2 according to their latest regulatory filings, with 20 funds opening new positions, 78 increasing their positions, 46 reducing their positions, and 20 closing their positions.
70% more repeat investments, than reductions
Existing positions increased: 78 | Existing positions reduced: 46
19% more capital invested
Capital invested by funds: $761M → $903M (+$142M)
3.79% more ownership
Funds ownership: 71.71% → 75.49% (+3.8%)
0% more first-time investments, than exits
New positions opened: 20 | Existing positions closed: 20
2% less funds holding
Funds holding: 188 → 184 (-4)
25% less funds holding in top 10
Funds holding in top 10: 4 → 3 (-1)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
CAM
Congress Asset Management
Boston,
Massachusetts
|
+$7.24M |
| 2 |
Citadel Advisors
Miami,
Florida
|
+$5.22M |
| 3 |
State Street
Boston,
Massachusetts
|
+$5.13M |
| 4 |
Mariner
Overland Park,
Kansas
|
+$4.43M |
| 5 |
American Century Companies
Kansas City,
Missouri
|
+$4.12M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Wellington Management Group
Boston,
Massachusetts
|
-$6.7M |
| 2 |
Northern Trust
Chicago,
Illinois
|
-$4.47M |
| 3 |
JP Morgan Chase
New York
|
-$3.11M |
| 4 |
JAM
Jacobs Asset Management
New York
|
-$3.02M |
| 5 |
UBS Group
Zurich,
Switzerland
|
-$2.4M |
OSBC Hedge Fund Activity: Q2 2026 in Review
184 of the 8,316 institutional investors tracked by Wall St. Rank reported a position in Old Second Bancorp (OSBC) for Q2 2026, worth a combined $903M — up 19% from $761M a quarter earlier.
Fund positioning in OSBC was balanced in Q2 2026: 20 funds opened new positions, 20 closed out, 78 added to existing stakes and 46 trimmed.
The largest buyer was Congress Asset Management, opening a new position worth an estimated $7.24M. The largest seller was Wellington Management Group, cutting an estimated $6.7M.
- 184 institutional investors held Old Second Bancorp (OSBC) as of Q2 2026, down from 188 in Q1 2026.
- Funds reported $903M of Old Second Bancorp stock for Q2 2026, up 19% quarter-over-quarter.
- 20 funds opened new Old Second Bancorp positions in Q2 2026 and 20 closed out, a net change of 0 holders.
- The largest Old Second Bancorp buyer in Q2 2026 was Congress Asset Management, an estimated $7.24M added.
- The largest Old Second Bancorp seller in Q2 2026 was Wellington Management Group, an estimated $6.7M sold.
Based on aggregated 13F filings for Q2 2026.