Old Second Bancorp Inc SEC filings OSBC
Old Second Bancorp Inc has 1,001 filings in SEC EDGAR's recent list, going back to Apr 1, 2016. Its latest annual report, Form ARS, was filed on Apr 6, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 4, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Oct 21, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 30, 2026 | — |
| 4 | Insider transaction | Oct 21, 2026 | May 11, 2021 |
| 4/A | Filing | Oct 21, 2026 | Feb 21, 2026 |
| 4/A | Filing | Oct 21, 2026 | Feb 21, 2026 |
| 4/A | Filing | Oct 20, 2026 | Feb 21, 2026 |
| 4/A | Filing | Oct 20, 2026 | Feb 21, 2026 |
| 4/A | Filing | Oct 20, 2026 | Feb 21, 2026 |
| 4/A | Filing | Oct 20, 2026 | Feb 21, 2026 |
| 4/A | Filing | Oct 20, 2026 | Feb 21, 2026 |
| 4/A | Filing | Oct 20, 2026 | Feb 21, 2026 |
| 4/A | Filing | Oct 20, 2026 | Feb 21, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 8, 2026 | — |
| 4 | Insider transaction | Oct 1, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Oct 1, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Oct 1, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Oct 1, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Oct 1, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Sep 23, 2026 | Sep 23, 2026 |
| 144 | Notice of proposed sale | Sep 23, 2026 | — |
| 4 | Insider transaction | Sep 11, 2026 | Sep 4, 2026 |
| 4 | Insider transaction | Sep 8, 2026 | Sep 8, 2026 |
| 4/A | Filing | Sep 8, 2026 | Sep 3, 2026 |
| 144 | Notice of proposed sale | Sep 8, 2026 | — |
| 4 | Insider transaction | Sep 3, 2026 | Sep 3, 2026 |
| 4 | Insider transaction | Sep 3, 2026 | Sep 2, 2026 |
| 144 | Notice of proposed sale | Sep 2, 2026 | — |
| 4 | Insider transaction | Aug 13, 2026 | Aug 12, 2026 |
| 4 | Insider transaction | Aug 12, 2026 | Aug 11, 2026 |
| 4 | Insider transaction | Aug 11, 2026 | Aug 10, 2026 |
| 144 | Notice of proposed sale | Aug 11, 2026 | — |
| 4 | Insider transaction | Jul 2, 2026 | Jun 30, 2026 |
| 4 | Insider transaction | Jul 2, 2026 | Jun 30, 2026 |
| 4 | Insider transaction | Jul 2, 2026 | Jun 30, 2026 |
| 4 | Insider transaction | Jul 2, 2026 | Jun 30, 2026 |
| 4 | Insider transaction | Jul 2, 2026 | Jun 30, 2026 |
| 4 | Insider transaction | May 26, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 21, 2026 | May 21, 2026 |
| 4 | Insider transaction | May 12, 2026 | May 11, 2026 |
| 4 | Insider transaction | May 11, 2026 | May 11, 2026 |
| 4 | Insider transaction | May 11, 2026 | May 8, 2026 |
| 4 | Insider transaction | Apr 2, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Apr 2, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Apr 2, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Apr 2, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Apr 2, 2026 | Mar 31, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 27, 2026 | — |
| 4 | Insider transaction | Mar 23, 2026 | Mar 20, 2026 |
| 4 | Insider transaction | Mar 4, 2026 | Mar 2, 2026 |
| 4 | Insider transaction | Mar 4, 2026 | Mar 2, 2026 |
| 4 | Insider transaction | Mar 4, 2026 | Mar 2, 2026 |
| 4 | Insider transaction | Mar 4, 2026 | Mar 2, 2026 |
| 4 | Insider transaction | Mar 4, 2026 | Mar 2, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 21, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 19, 2026 | Feb 18, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 13, 2026 |
| 4 | Insider transaction | Feb 10, 2026 | Feb 9, 2026 |
| 4 | Insider transaction | Feb 5, 2026 | Feb 5, 2026 |
| 4 | Insider transaction | Jan 16, 2026 | Jan 15, 2026 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Dec 9, 2025 | Dec 9, 2025 |
| 4 | Insider transaction | Nov 26, 2025 | Nov 26, 2025 |
| 4 | Insider transaction | Nov 13, 2025 | Nov 10, 2025 |
| 4 | Insider transaction | Nov 7, 2025 | Oct 30, 2025 |
| 4 | Insider transaction | Oct 1, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Oct 1, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Oct 1, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Oct 1, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Oct 1, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Aug 5, 2025 | Aug 4, 2025 |
| 4 | Insider transaction | Jul 21, 2025 | Jul 18, 2025 |
| 3 | Initial insider ownership | Jul 8, 2025 | Jul 1, 2025 |
| 4 | Insider transaction | Jul 8, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jul 7, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jul 7, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jul 7, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jul 7, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | May 6, 2025 | May 6, 2025 |
| 4 | Insider transaction | May 6, 2025 | May 5, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Mar 25, 2025 | Mar 11, 2025 |
| 4 | Insider transaction | Mar 6, 2025 | Mar 4, 2025 |
| 4 | Insider transaction | Mar 6, 2025 | Mar 4, 2025 |
| 4 | Insider transaction | Mar 6, 2025 | Mar 4, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| 4 | Insider transaction | Feb 21, 2025 | Feb 19, 2025 |
| 4 | Insider transaction | Feb 11, 2025 | Feb 10, 2025 |
| 4 | Insider transaction | Jan 2, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 2, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 2, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 2, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 2, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Dec 26, 2024 | Dec 23, 2024 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 13, 2024 | — |
| 4 | Insider transaction | Nov 12, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 5, 2024 | Nov 4, 2024 |
| 4 | Insider transaction | Oct 4, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Oct 4, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Oct 4, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Oct 4, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Oct 4, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Aug 6, 2024 | Aug 5, 2024 |
| 4 | Insider transaction | Jul 23, 2024 | Jul 22, 2024 |
| 4 | Insider transaction | Jul 2, 2024 | Mar 31, 2024 |
| 4 | Insider transaction | Jul 2, 2024 | Mar 31, 2024 |
| 4 | Insider transaction | Jul 2, 2024 | Mar 31, 2024 |
| 4 | Insider transaction | Jul 2, 2024 | Mar 31, 2024 |
| 4 | Insider transaction | Jul 2, 2024 | Mar 31, 2024 |
| 4 | Insider transaction | May 9, 2024 | May 8, 2024 |
| 4 | Insider transaction | May 7, 2024 | May 6, 2024 |
| 4 | Insider transaction | Apr 24, 2024 | Apr 22, 2024 |
| 4 | Insider transaction | Mar 21, 2024 | Mar 20, 2024 |
| 4/A | Filing | Mar 18, 2024 | Mar 13, 2024 |
| 4 | Insider transaction | Mar 15, 2024 | Mar 13, 2024 |
| 4 | Insider transaction | Mar 15, 2024 | Mar 13, 2024 |
| 4 | Insider transaction | Mar 15, 2024 | Mar 13, 2024 |
| 4/A | Filing | Feb 22, 2024 | Feb 20, 2024 |
| 4 | Insider transaction | Feb 22, 2024 | Feb 20, 2024 |
| 4 | Insider transaction | Feb 22, 2024 | Feb 20, 2024 |
| 4 | Insider transaction | Feb 22, 2024 | Feb 20, 2024 |
| 4 | Insider transaction | Feb 22, 2024 | Feb 20, 2024 |
| 4 | Insider transaction | Feb 22, 2024 | Feb 20, 2024 |
| 4 | Insider transaction | Feb 22, 2024 | Feb 20, 2024 |
| 4 | Insider transaction | Feb 22, 2024 | Feb 20, 2024 |
| 4 | Insider transaction | Feb 22, 2024 | Feb 20, 2024 |
| 4 | Insider transaction | Feb 22, 2024 | Feb 20, 2024 |
| 4 | Insider transaction | Feb 22, 2024 | Feb 20, 2024 |
| 4 | Insider transaction | Feb 22, 2024 | Feb 20, 2024 |
| 4 | Insider transaction | Feb 22, 2024 | Feb 20, 2024 |
| 4 | Insider transaction | Feb 22, 2024 | Feb 20, 2024 |
| 4 | Insider transaction | Feb 22, 2024 | Feb 20, 2024 |
| SC 13G | Ownership over 5% (passive) | Feb 13, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 8, 2024 | — |
| 4 | Insider transaction | Feb 7, 2024 | Feb 6, 2024 |
| 4 | Insider transaction | Feb 2, 2024 | Feb 1, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 26, 2024 | — |
| 4 | Insider transaction | Jan 2, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Jan 2, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Jan 2, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Jan 2, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Jan 2, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Nov 8, 2023 | Nov 7, 2023 |
| 4 | Insider transaction | Oct 2, 2023 | Sep 30, 2023 |
| 4 | Insider transaction | Oct 2, 2023 | Sep 30, 2023 |
| 4 | Insider transaction | Oct 2, 2023 | Sep 30, 2023 |
| 4 | Insider transaction | Oct 2, 2023 | Sep 30, 2023 |
| 4 | Insider transaction | Oct 2, 2023 | Sep 30, 2023 |
| 4 | Insider transaction | Aug 10, 2023 | Aug 8, 2023 |
| 4 | Insider transaction | Jul 26, 2023 | Jul 25, 2023 |
| 4 | Insider transaction | Jul 24, 2023 | Jul 20, 2023 |
| 4 | Insider transaction | Jul 3, 2023 | Jun 30, 2023 |
| 4 | Insider transaction | Jul 3, 2023 | Jun 30, 2023 |
| 4 | Insider transaction | Jul 3, 2023 | Jun 30, 2023 |
| 4 | Insider transaction | Jul 3, 2023 | Jun 30, 2023 |
| 4 | Insider transaction | Jul 3, 2023 | Jun 30, 2023 |
| 4 | Insider transaction | May 10, 2023 | May 9, 2023 |
| 4 | Insider transaction | Apr 12, 2023 | Apr 11, 2023 |
| 4 | Insider transaction | Apr 4, 2023 | Mar 31, 2023 |
| 4 | Insider transaction | Apr 4, 2023 | Mar 31, 2023 |
| 4 | Insider transaction | Apr 4, 2023 | Mar 31, 2023 |
| 4 | Insider transaction | Apr 4, 2023 | Mar 31, 2023 |
| 4 | Insider transaction | Apr 4, 2023 | Mar 31, 2023 |
| 4 | Insider transaction | Mar 28, 2023 | Jun 9, 2022 |
| 4 | Insider transaction | Mar 23, 2023 | Mar 23, 2023 |
| 4 | Insider transaction | Mar 13, 2023 | Mar 10, 2023 |
| 4 | Insider transaction | Mar 3, 2023 | Mar 2, 2023 |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- State Commercial Banks (SIC 6022)
- Listed as
- OSBC (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Aurora, IL
- SEC filer status
- Large accelerated filer
- SEC CIK
- 357173
Other State Commercial Banks companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.