Filing Flows

Filing Flows › Old Second Bancorp (OSBC) › Who owns the stock

Who owns Old Second Bancorp (OSBC) stock

177 funds reported Old Second Bancorp (OSBC) shares in their latest 13F filings, worth $910M in all. The largest holder is BlackRock ($100M). Last quarter 82 funds added to their stakes and 62 cut them.

Largest holders of OSBC (13F)Largest holders of OSBC (13F)BlackRock$100MVanguard Group$63.9MDimensional Fund Advisors LP$58.3MVanguard Capital Management LLC$50.8MState Street$42.9MDavis Asset Management, L.P.$42.0MAmerican Century Companies$41.6MGoldman Sachs Group$37.9MFJ Capital Management LLC$34.1MBoston Partners$32.9M

Largest holders (13F)

FundSharesValueChangeQuarter
BlackRock4,298,683$100Mincrease2026-06-30
Vanguard Group3,278,388$63.9Mincrease2025-12-31
Dimensional Fund Advisors LP2,498,671$58.3Mincrease2026-06-30
Vanguard Capital Management LLC2,179,877$50.8Mdecrease2026-06-30
State Street1,839,202$42.9Mincrease2026-06-30
Davis Asset Management, L.P.1,800,000$42.0Munchanged2026-06-30
American Century Companies1,783,820$41.6Mincrease2026-06-30
Goldman Sachs Group1,624,852$37.9Mdecrease2026-06-30
FJ Capital Management LLC1,460,413$34.1Mdecrease2026-06-30
Boston Partners1,415,165$32.9Mdecrease2026-06-30
Geode Capital Management, LLC1,349,432$31.5Mincrease2026-06-30
Kennedy Capital Management LLC1,236,983$28.8Mdecrease2026-06-30
Banc Funds Co LLC1,034,143$24.1Mincrease2026-06-30
Manufacturers Life Insurance Company, the872,651$20.4Mdecrease2026-06-30
Vanguard Portfolio Management LLC819,368$19.1Mincrease2026-06-30

Old Second Bancorp's latest quarter

Old Second Bancorp, Q3 2026: revenue $97.1M (+1% year over year), operating margin 39.9%, net earnings $28.9M, operating cash flow $64.8M. The chart follows the revenue to costs, profit and cash.

Questions

Who owns the most OSBC stock?

By the latest 13F filings: BlackRock ($100M); Vanguard Group ($63.9M); Dimensional Fund Advisors LP ($58.3M); Vanguard Capital Management LLC ($50.8M); State Street ($42.9M).

What is the short interest in OSBC?

3,040,735 shares were sold short at the 2026-10-15 settlement, 10.76% of the float.

Open the interactive view →

Updated Nov 8, 2026. Read automatically from SEC filings and public data; errors are possible. Not investment advice.