Citadel Advisors
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Citadel Advisors’s Old Second Bancorp OSBC Stock Holding History

Citadel Advisors’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
2024
Q4 		– Sell
-700
Closed -$10.9K – 15132
2024
Q3 		$10.9K Hold
700
– – ﹤0.01% 13181
2024
Q2 		$10.4K Buy
700
+600
+600% +$8.44K ﹤0.01% 13089
2024
Q1 		$1.38K Buy
+100
New +$1.4K ﹤0.01% 14137
2023
Q4 		– Sell
-1,000
Closed -$13.6K – 14959
2023
Q3 		$13.6K Buy
+1,000
New +$14.6K ﹤0.01% 12911

Other funds holding OSBC

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
DAM
Davis Asset Management Sausalito, California $3.95B AUM 11.79% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return
FCM
FJ Capital Management Mclean, Virginia $770M AUM 28.42% 1-Year Est. Return
Boston Partners
Boston Partners Boston, Massachusetts $113B AUM 38.87% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Citadel Advisors's OSBC Position: Q2 2026 in Review

Citadel Advisors increased its Old Second Bancorp (OSBC) stake by 406% in Q2 2026, buying an estimated $5.22M and bringing the position to 304,021 shares worth $7.09M. The position accounts for ﹤0.01% of the portfolio, ranked #4131.

Citadel Advisors first reported a position in OSBC in Q1 2014 and has held it in 32 quarters since. 185 funds tracked by Wall St. Rank hold OSBC as of Q2 2026.

  • Citadel Advisors held 304,021 shares of Old Second Bancorp worth $7.09M as of Q2 2026.
  • Citadel Advisors bought 243,956 Old Second Bancorp shares in Q2 2026, an estimated $5.22M.
  • Old Second Bancorp made up ﹤0.01% of Citadel Advisors's portfolio in Q2 2026, its #4131 holding.
  • Citadel Advisors first reported a position in Old Second Bancorp in Q1 2014 and has held it in 32 quarters since.
  • 185 funds tracked by Wall St. Rank held Old Second Bancorp as of Q2 2026.

Based on Citadel Advisors's 13F filing for Q2 2026, filed 14 Aug 2026.