Old Second Bancorp SEC Filings
NASDAQ: OSBCFinanceMajor BanksUSD
24.61-0.25 (-1.01%)
At close: Oct 9, 4:00 PM ET · Delayed 15 min
Old Second Bancorp filing overview
This page lists 60 recent SEC filings by Old Second Bancorp (OSBC), including 39 4, 14 8-K, 2 10-Q, 1 SCHEDULE 13G. The latest annual report (10-K) was filed on Feb 26, 2026 for the period ending Dec 31, 2025. The most recent quarterly report (10-Q) was filed on Aug 6, 2026.
The latest current report (8-K), used to disclose material events such as earnings releases and executive changes, was filed on Oct 1, 2026. Form 10-K is the audited annual report, 10-Q the quarterly report, 8-K covers material events, and Form 4 reports insider transactions. All documents link directly to SEC EDGAR.
Summary generated from market data by MetaCap's automated system. Methodology
OSBC SEC filings
| Filed | Form | Description | Document |
|---|---|---|---|
| Oct 8, 2026 | SCHEDULE 13G | Beneficial ownership report (passive) | View on EDGAR |
| Oct 1, 2026 | 8-K | Other Events | View on EDGAR |
| Oct 1, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Oct 1, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Oct 1, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Oct 1, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Oct 1, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Sep 23, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Sep 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Sep 8, 2026 | 4/A | Statement of changes in beneficial ownership (amendment) | View on EDGAR |
| Sep 8, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Sep 3, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Sep 3, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 13, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 12, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 6, 2026 | 10-Q | Quarterly report | View on EDGAR |
| Jul 22, 2026 | 8-K | Results of Operations and Financial Condition | View on EDGAR |
| Jul 21, 2026 | 8-K | Other Events | View on EDGAR |
| Jul 8, 2026 | 8-K | Departure or Appointment of Directors or Officers; Compensatory Arrangements | View on EDGAR |
| Jul 2, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jul 2, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jul 2, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jul 2, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jul 2, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jul 1, 2026 | 8-K | Other Events | View on EDGAR |
| Jun 25, 2026 | 8-K | Other Events | View on EDGAR |
| Jun 9, 2026 | 8-K | Departure or Appointment of Directors or Officers; Compensatory Arrangements | View on EDGAR |
| May 26, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| May 21, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| May 20, 2026 | 8-K | Submission of Matters to a Vote of Security Holders | View on EDGAR |
| May 19, 2026 | 8-K | Regulation FD Disclosure | View on EDGAR |
| May 12, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| May 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| May 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| May 7, 2026 | 10-Q | Quarterly report | View on EDGAR |
| Apr 22, 2026 | 8-K | Results of Operations and Financial Condition | View on EDGAR |
| Apr 21, 2026 | 8-K | Other Events | View on EDGAR |
| Apr 6, 2026 | DEF 14A | Definitive proxy statement | View on EDGAR |
| Apr 2, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Apr 2, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Apr 2, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Apr 2, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Apr 2, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Apr 1, 2026 | 8-K | Other Events | View on EDGAR |
| Mar 27, 2026 | SCHEDULE 13G/A | Beneficial ownership report (passive) (amendment) | View on EDGAR |
| Mar 23, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Mar 4, 2026 | 8-K | Other Events | View on EDGAR |
| Mar 4, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Mar 4, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Mar 4, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Mar 4, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Mar 4, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 26, 2026 | 10-K | Annual report | View on EDGAR |
| Feb 24, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 24, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 24, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 24, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 24, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jan 29, 2026 | 8-K | Other Events | View on EDGAR |