Old Second Bancorp Inc (OSBC)
Financial Services
Banks - Regional
25.30 $
-0.2%
vs. previous close
Closing price · As of: 31. Jul 2026
Who owns Old Second Bancorp Inc (OSBC)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 96.4% of the shares are freely tradable; institutional investors hold 75.9%.
Ownership Structure
Institutional ownership
Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings.
75.9%
Insiders
Share of the stock held by the executives, founders and major shareholders of the company itself.
4.5%
Float
Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders.
96.4%
Short % of float
Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices.
3.5%
Shares Outstanding
Total number of shares issued. Price times share count gives market cap.
51Mio.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 8.02 | 4,126,244 | -0.7 | 03/31/2026 |
| Vanguard Group Inc | 6.37 | 3,278,388 | +0.3 | 12/31/2025 |
| Dimensional Fund Advisors, Inc. | 4.64 | 2,388,862 | +5.7 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.38 | 2,251,849 | +0.0 | 03/31/2026 |
| Davis Asset Management, L.P. | 3.50 | 1,800,000 | +3.1 | 03/31/2026 |
| The Goldman Sachs Group Inc | 3.29 | 1,691,523 | +33.9 | 03/31/2026 |
| State Street Corp | 3.11 | 1,599,302 | +3.9 | 03/31/2026 |
| American Century Companies Inc | 3.09 | 1,590,943 | +8.2 | 03/31/2026 |
| FJ Capital Management LLC | 2.93 | 1,505,102 | -17.7 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Total Stock Mkt Idx Inv | 3.13 | 1,610,374 | +0.0 | 04/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.