Old Second Bancorp Inc (OSBC) Institutional Ownership

Ownership Summary

According to SEC filings for the period ending September 2025, Old Second Bancorp Inc (NASDAQ:OSBC) is held by 197 institutional firms.

• Institutional ownership in Old Second Bancorp edged up to 77.3% in September 2025, compared to 71.8% in June 2025.
• Quarterly data indicates a 12.07% shift in institutional share volume, and the annual owner count reflects an increase of 13.22%.
• During the quarter, 117 institutions bought more Old Second Bancorp shares, 50 sold shares, and 30 of the 197 total investors held their position steady.
• This class of investors increased its holdings in Old Second Bancorp to 36.14Mn shares for the 13F-cycle ending September 2025, up by 3.89Mn shares quarter on quarter, and up 4.56Mn shares year over year.
• BlackRock, Inc.'s holding of 3.82Mn shares as of September 30, 2025 makes it the primary institutional investor in Old Second Bancorp, owning 8.16% of the stock.
• Among the most significant buyers of Old Second Bancorp during September 2025 were NORTHERN TRUST CORP (583.49K), VANGUARD GROUP INC (553.17K), River Street Advisors LLC (383.95K), BlackRock, Inc. (316.18K), GEODE CAPITAL MANAGEMENT, LLC (211.81K).
• Leading sellers of Old Second Bancorp stock in September 2025 included BANC FUNDS CO LLC (151.00K), UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC (75.92K), JPMORGAN CHASE & CO (69.87K), SUSQUEHANNA INTERNATIONAL GROUP, LLP (55.80K), MORGAN STANLEY (35.11K).
• The top 10 institutional holders of Old Second Bancorp for the quarter ending September 2025 included BlackRock, Inc. (3.82Mn), VANGUARD GROUP INC (3.27Mn), DIMENSIONAL FUND ADVISORS LP (2.20Mn), FJ Capital Management LLC (1.92Mn), GOLDMAN SACHS GROUP INC (1.56Mn), Davis Asset Management, L.P. (1.50Mn), AMERICAN CENTURY COMPANIES INC (1.39Mn), STATE STREET CORP (1.37Mn), GEODE CAPITAL MANAGEMENT, LLC (1.36Mn), KENNEDY CAPITAL MANAGEMENT LLC (1.09Mn).