OSBC Old Second Bancorp Inc.
Old Second Bancorp Inc. (OSBC) Institutional Ownership
What the institutions did with OSBC last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
Sign in or subscribeLargest holders
| Manager | Shares | % of reported |
|---|---|---|
| BlackRock, Inc. | 4.3M | 11.1% |
| DIMENSIONAL FUND ADVISORS LP | 2.5M | 6.4% |
| VANGUARD CAPITAL MANAGEMENT LLC | 2.2M | 5.6% |
| STATE STREET CORP | 1.8M | 4.7% |
| Davis Asset Management, L.P. | 1.8M | 4.6% |
| AMERICAN CENTURY COMPANIES INC | 1.8M | 4.6% |
| GOLDMAN SACHS GROUP INC | 1.6M | 4.2% |
| FJ Capital Management LLC | 1.5M | 3.8% |
| Boston Partners | 1.4M | 3.6% |
| GEODE CAPITAL MANAGEMENT, LLC | 1.3M | 3.5% |
| KENNEDY CAPITAL MANAGEMENT LLC | 1.2M | 3.2% |
| BANC FUNDS CO LLC | 1.0M | 2.7% |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | 872.7K | 2.3% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 819.4K | 2.1% |
| Stieven Capital Advisors, L.P. | 815.3K | 2.1% |
| River Street Advisors LLC | 779.0K | 2.0% |
| ALLIANCEBERNSTEIN L.P. | 641.8K | 1.7% |
| JPMORGAN CHASE & CO | 555.6K | 1.4% |
| NORTHERN TRUST CORP | 555.4K | 1.4% |
| WELLINGTON MANAGEMENT GROUP LLP | 544.3K | 1.4% |
| Nuveen, LLC | 492.2K | 1.3% |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 453.3K | 1.2% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 431.3K | 1.1% |
| AQR CAPITAL MANAGEMENT LLC | 386.2K | 1.0% |
| BANK OF AMERICA CORP /DE/ | 372.6K | 1.0% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| CONGRESS ASSET MANAGEMENT CO | New | 0 | 338.7K | +338.7K |
| WELLINGTON MANAGEMENT GROUP LLP | Reduced | 857.8K | 544.3K | -313.4K |
| CITADEL ADVISORS LLC | Increased | 60.1K | 304.0K | +244.0K |
| STATE STREET CORP | Increased | 1.6M | 1.8M | +239.9K |
| NORTHERN TRUST CORP | Reduced | 764.3K | 555.4K | -208.9K |
| Mariner, LLC | Increased | 18.1K | 225.3K | +207.2K |
| AMERICAN CENTURY COMPANIES INC | Increased | 1.6M | 1.8M | +192.9K |
| BlackRock, Inc. | Increased | 4.1M | 4.3M | +172.4K |
| FRANKLIN RESOURCES INC | Increased | 88.2K | 259.3K | +171.2K |
| JACOBS ASSET MANAGEMENT, LLC | Sold Out | 150.0K | 0 | -150.0K |
| JPMORGAN CHASE & CO | Reduced | 701.0K | 555.6K | -145.4K |
| TWO SIGMA INVESTMENTS, LP | Increased | 67.4K | 200.8K | +133.5K |
| D. E. Shaw & Co., Inc. | New | 0 | 114.3K | +114.3K |
| UBS Group AG | Reduced | 259.3K | 147.2K | -112.1K |
| DIMENSIONAL FUND ADVISORS LP | Increased | 2.4M | 2.5M | +109.8K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 712.4K | 819.4K | +106.9K |
| Thrivent Financial for Lutherans | Increased | 143.1K | 242.3K | +99.2K |
| SEI INVESTMENTS CO | Reduced | 203.1K | 117.7K | -85.4K |
| FIRST TRUST ADVISORS LP | Increased | 18.8K | 94.3K | +75.6K |
| Knights of Columbus Asset Advisors LLC | Reduced | 131.4K | 57.4K | -74.1K |
| Nuveen, LLC | Increased | 419.6K | 492.2K | +72.5K |
| VANGUARD CAPITAL MANAGEMENT LLC | Reduced | 2.3M | 2.2M | -72.0K |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | Increased | 141.0K | 210.7K | +69.7K |
| RENAISSANCE TECHNOLOGIES LLC | Reduced | 90.2K | 21.2K | -69.0K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 1.3M | 1.3M | +67.4K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.