OLD SECOND BANCORP INC (OSBC) Institutional Ownership and Insiders Activity

OLD SECOND BANCORP INC (OSBC) is widely held by institutional investors, with 180 firms reporting positions valued at approximately $895.12M based on SEC Form 13F filings for the quarter ended June 30, 2026.

Blackrock, Inc. is the largest disclosed holder, reporting approximately $100.25M in OSBC holdings in its latest filing.

Recent insider activity includes 14 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.