Jane Street’s Old Second Bancorp OSBC Stock Holding History

Jane Street’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
2026 Q1	$1.04M	Buy	+51,428	New	+$1.03M	﹤0.01%	6422
2025 Q4	–	Sell	-22,309	Closed	-$386K	–	12026
2025 Q3	$386K	Sell	22,309 -18,277	-45%	-$329K	﹤0.01%	8392
2025 Q2	$720K	Sell	40,586 -42,231	-51%	-$689K	﹤0.01%	6249
2025 Q1	$1.38M	Buy	+82,817	New	+$1.48M	﹤0.01%	4984
2024 Q4	–	Sell	-62,398	Closed	-$973K	–	10239
2024 Q3	$973K	Buy	62,398 +12,785	+26%	+$206K	﹤0.01%	5947
2024 Q2	$735K	Buy	+49,613	New	+$698K	﹤0.01%	6358
2024 Q1	–	Sell	-34,561	Closed	-$534K	–	9845
2023 Q4	$534K	Buy	+34,561	New	+$500K	﹤0.01%	6650
2023 Q1	–	Sell	-13,479	Closed	-$216K	–	9683
2022 Q4	$216K	Buy	+13,479	New	+$215K	﹤0.01%	7549
2021 Q3	–	Sell	-28,038	Closed	-$348K	–	10507
2021 Q2	$348K	Buy	+28,038	New	+$375K	﹤0.01%	7905

Other funds holding OSBC

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

DAM

Davis Asset Management Sausalito, California $3.46B AUM 9.77% 1-Year Est. Return

Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return

FCM

FJ Capital Management Mclean, Virginia $888M AUM 18.97% 1-Year Est. Return

Boston Partners Boston, Massachusetts $113B AUM 38.87% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Jane Street's OSBC Position: Q1 2026 in Review

Jane Street opened a new position in Old Second Bancorp (OSBC) in Q1 2026: 51,428 shares worth $1.04M. The stake represents ﹤0.01% of the portfolio and ranks #6422 among its holdings. This is a return to the name: Jane Street previously reported a position in OSBC as recently as Q3 2025.

Jane Street first reported a position in OSBC in Q2 2021 and has held it in 9 quarters since. The position peaked at $1.38M in Q1 2025. 188 funds tracked by Wall St. Rank hold OSBC as of Q1 2026.

Jane Street held 51,428 shares of Old Second Bancorp worth $1.04M as of Q1 2026.
Old Second Bancorp was a new Jane Street position in Q1 2026.
Old Second Bancorp made up ﹤0.01% of Jane Street's portfolio in Q1 2026, its #6422 holding.
Jane Street first reported a position in Old Second Bancorp in Q2 2021 and has held it in 9 quarters since.
Jane Street's Old Second Bancorp position peaked at $1.38M in Q1 2025.
188 funds tracked by Wall St. Rank held Old Second Bancorp as of Q1 2026.

Based on Jane Street's 13F filing for Q1 2026, filed 12 May 2026.