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Magnetar Financial’s Old Second Bancorp OSBC Stock Holding History

Magnetar Financial’s Portfolio OSBC Stock Details OSBC Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		– Sell
-23,901
Closed -$413K – 1146
2025
Q3 		$413K Buy
+23,901
New +$430K ﹤0.01% 632
2024
Q4 		– Sell
-21,365
Closed -$333K – 744
2024
Q3 		$333K Buy
+21,365
New +$344K 0.01% 389

Other funds holding OSBC

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
FCM
FJ Capital Management Mclean, Virginia $888M AUM 18.97% 1-Year Est. Return
DAM
Davis Asset Management Sausalito, California $3.46B AUM 9.77% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
KCM
Kennedy Capital Management St Louis, Missouri $4.72B AUM 36.69% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return

Magnetar Financial's OSBC Position: Q4 2025 in Review

Magnetar Financial sold out of Old Second Bancorp (OSBC) in Q4 2025, closing a stake of 23,901 shares — an estimated $413K sold.

Magnetar Financial first reported a position in OSBC in Q3 2024 and held it in 2 quarters. The position peaked at $413K in Q3 2025. 185 funds tracked by Wall St. Rank hold OSBC as of Q4 2025.

  • Magnetar Financial reported no remaining Old Second Bancorp position as of Q4 2025 after selling out during the quarter.
  • Magnetar Financial sold 23,901 Old Second Bancorp shares in Q4 2025, an estimated $413K.
  • Magnetar Financial first reported a position in Old Second Bancorp in Q3 2024 and held it in 2 quarters.
  • Magnetar Financial's Old Second Bancorp position peaked at $413K in Q3 2025.
  • 185 funds tracked by Wall St. Rank held Old Second Bancorp as of Q4 2025.

Based on Magnetar Financial's 13F filing for Q4 2025, filed 17 Feb 2026.