Old Second Bancorp, Inc. (OSBC) ownership: Top institutional holder: BlackRock, Inc. ($83.19M). Insider activity: Net Seller (3 buys, 17 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock, Inc. | 4126244.00 | $83.19M | 2026-03-31 |
| VANGUARD GROUP INC | 3278388.00 | $63.93M | 2025-12-31 |
| DIMENSIONAL FUND ADVISORS LP | 2388862.00 | $48.16M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 2251849.00 | $45.40M | 2026-03-31 |
| Davis Asset Management, L.P. | 1800000.00 | $36.29M | 2026-03-31 |
| GOLDMAN SACHS GROUP INC | 1691523.00 | $34.10M | 2026-03-31 |
| STATE STREET CORP | 1599302.00 | $32.24M | 2026-03-31 |
| AMERICAN CENTURY COMPANIES INC | 1590943.00 | $32.07M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-05-22 | |
| Sell | null | 2026-05-21 | |
| Sell | null | 2026-05-11 | |
| Sell | null | 2026-05-11 | |
| Sell | null | 2026-05-08 | |
| Sell | null | 2026-05-08 | |
| Sell | null | 2026-03-31 | |
| Sell | null | 2026-03-31 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.