Who owns OLD SECOND BANCORP INC?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of OSBC from SEC Form 13F filings across 184 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 184 institutions disclosed 38.8M shares of OLD SECOND BANCORP INC worth $903.3M — about 75.8% of shares outstanding; the largest disclosed holder is BlackRock, Inc.. Source: SEC Form 13F filings, parsed by EvidInvest.
184
13F holders
$903.3M
value, 2026 filers
75.8%
of shares outstanding (38.8M sh)
19
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of OSBC's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 4.3M | $100.2M | 0.0% | 8.4% | +4.2% |
| 2 | DIMENSIONAL FUND ADVISORS LP | 2.5M | $58.3M | 0.0% | 4.9% | +4.6% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 2.2M | $50.8M | 0.0% | 4.3% | -3.2% |
| 4 | STATE STREET CORP | 1.8M | $42.9M | 0.0% | 3.6% | +15.0% |
| 5 | Davis Asset Management, L.P. | 1.8M | $42.0M | 1.1% | 3.5% | 0.0% |
| 6 | AMERICAN CENTURY COMPANIES INC | 1.8M | $41.6M | 0.0% | 3.5% | +12.1% |
| 7 | GOLDMAN SACHS GROUP INC | 1.6M | $37.9M | 0.0% | 3.2% | -3.9% |
| 8 | FJ Capital Management LLC | 1.5M | $34.1M | 4.4% | 2.8% | -3.0% |
| 9 | Boston Partners | 1.4M | $32.9M | 0.0% | 2.8% | -2.0% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 1.3M | $31.5M | 0.0% | 2.6% | +5.3% |
| 11 | KENNEDY CAPITAL MANAGEMENT LLC | 1.2M | $28.8M | 0.5% | 2.4% | -2.5% |
| 12 | BANC FUNDS CO LLC | 1.0M | $24.1M | 4.0% | 2% | +0.5% |
| 13 | MANUFACTURERS LIFE INSURANCE COMPANY, THE | 872,651 | $20.4M | 0.0% | 1.7% | -0.7% |
| 14 | VANGUARD PORTFOLIO MANAGEMENT LLC | 819,368 | $19.1M | 0.0% | 1.6% | +15.0% |
| 15 | Stieven Capital Advisors, L.P. | 815,328 | $19.0M | 3.6% | 1.6% | +5.4% |
| 16 | River Street Advisors LLC | 779,008 | $18.2M | 5.4% | 1.5% | +4.3% |
| 17 | ALLIANCEBERNSTEIN L.P. | 641,845 | $12.9M | 0.0% | 1.3% | -7.1% |
| 18 | JPMORGAN CHASE & CO | 555,602 | $12.9M | 0.0% | 1.1% | -20.7% |
| 19 | NORTHERN TRUST CORP | 555,408 | $13.0M | 0.0% | 1.1% | -27.3% |
| 20 | WELLINGTON MANAGEMENT GROUP LLP | 544,345 | $12.7M | 0.0% | 1.1% | -36.5% |
| 21 | Nuveen, LLC | 492,162 | $11.5M | 0.0% | 1% | +17.3% |
| 22 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 453,323 | $10.6M | 0.2% | 0.9% | +3.4% |
| 23 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 431,304 | $10.1M | 0.0% | 0.8% | +0.1% |
| 24 | AQR CAPITAL MANAGEMENT LLC | 386,234 | $9.0M | 0.0% | 0.8% | -1.5% |
| 25 | BANK OF AMERICA CORP /DE/ | 372,648 | $8.7M | 0.0% | 0.7% | +12.5% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.