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

OLD SECOND BANCORP INC (OSBC) is widely held by institutional investors, with 1 tracked firm reporting positions valued at approximately $494,874 based on SEC Form 13F filings for the quarter ended June 30, 2026.

Renaissance Technologies LLC is the largest disclosed holder, reporting approximately $494,874 in OSBC holdings in its latest filing.

Institutional ownership among tracked investors remains highly concentrated, with Renaissance Technologies LLC representing the majority of disclosed value.

Recent insider activity includes 12 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.