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.
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
Top Buyers
| 1 |
Boston Partners
Boston,
Massachusetts
|
+$12.6M |
| 2 |
Goldman Sachs
New York
|
+$8.59M |
| 3 |
RSA
River Street Advisors
Aurora,
Illinois
|
+$7.64M |
| 4 |
EF
Empowered Funds
Havertown,
Pennsylvania
|
+$4.69M |
| 5 |
Dimensional Fund Advisors
Austin,
Texas
|
+$2.57M |
Top Sellers
| 1 |
FCM
FJ Capital Management
Mclean,
Virginia
|
-$6.51M |
| 2 |
Millennium Management
New York
|
-$5.66M |
| 3 |
Adage Capital Partners
Boston,
Massachusetts
|
-$4.74M |
| 4 |
JP Morgan Chase
New York
|
-$3.17M |
| 5 |
JAM
Jacobs Asset Management
New York
|
-$2.64M |
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.