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 |
|---|---|---|---|
| 10-Q | Quarterly report | Nov 4, 2026 | Sep 30, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 30, 2026 | — |
| 4 | Insider transaction | Oct 21, 2026 | May 11, 2021 |
| 8-K |
Current report
Results of operations
|
Oct 21, 2026 | Oct 21, 2026 |
| 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 |
| 8-K |
Current report
Other events
|
Oct 20, 2026 | Oct 20, 2026 |
| 4/A | Filing | Oct 20, 2026 | Feb 21, 2026 |
| 8-K |
Current report
Officer or director change
|
Oct 19, 2026 | Oct 14, 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 |
| 8-K |
Current report
Other events
|
Oct 1, 2026 | Oct 1, 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 | — |
| S-3ASR | Automatic shelf registration | Aug 18, 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 | — |
| 10-Q | Quarterly report | Aug 6, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Jul 22, 2026 | Jul 22, 2026 |
| 8-K |
Current report
Other events
|
Jul 21, 2026 | Jul 21, 2026 |
| 8-K |
Current report
Officer or director change
|
Jul 8, 2026 | Jul 7, 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 |
| 8-K |
Current report
Other events
|
Jul 1, 2026 | Jul 1, 2026 |
| 11-K | Employee savings plan report | Jun 29, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Other events
|
Jun 25, 2026 | Jun 25, 2026 |
| 8-K |
Current report
Officer or director change
|
Jun 9, 2026 | Jun 5, 2026 |
| 4 | Insider transaction | May 26, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 21, 2026 | May 21, 2026 |
| 8-K |
Current report
Shareholder vote results
|
May 20, 2026 | May 19, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
May 19, 2026 | May 19, 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 |
| 10-Q | Quarterly report | May 7, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
Apr 22, 2026 | Apr 22, 2026 |
| 8-K |
Current report
Other events
|
Apr 21, 2026 | Apr 21, 2026 |
| ARS | Annual report to shareholders | Apr 6, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Apr 6, 2026 | — |
| DEF 14A | Proxy statement | Apr 6, 2026 | May 19, 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 |
| 8-K |
Current report
Other events
|
Apr 1, 2026 | Apr 1, 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 |
| 8-K |
Current report
Other events
|
Mar 4, 2026 | Mar 4, 2026 |
| 10-K | Annual report | Feb 26, 2026 | Dec 31, 2025 |
| 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 |
| 8-K |
Current report
Other events
|
Jan 29, 2026 | Jan 29, 2026 |
| 8-K |
Current report
Results of operations
|
Jan 21, 2026 | Jan 21, 2026 |
| 8-K |
Current report
Other events
|
Jan 20, 2026 | Jan 20, 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 |
| 8-K |
Current report
Other events
|
Jan 2, 2026 | Jan 2, 2026 |
| 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 |
| 10-Q | Quarterly report | Nov 6, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Oct 22, 2025 | Oct 22, 2025 |
| 8-K |
Current report
Other events
|
Oct 21, 2025 | Oct 21, 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 |
| 8-K |
Current report
Other events
|
Oct 1, 2025 | Oct 1, 2025 |
| 8-K/A | Amended current report | Sep 17, 2025 | Jul 1, 2025 |
| 8-K |
Current report
Officer or director change
|
Sep 15, 2025 | Sep 14, 2025 |
| 10-Q | Quarterly report | Aug 7, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Aug 5, 2025 | Aug 4, 2025 |
| 8-K |
Current report
Results of operations
|
Jul 23, 2025 | Jul 23, 2025 |
| 4 | Insider transaction | Jul 21, 2025 | Jul 18, 2025 |
| 8-K |
Current report
Other events
|
Jul 15, 2025 | Jul 15, 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 |
| 8-K |
Current report
Other events
|
Jul 2, 2025 | Jul 2, 2025 |
| 8-K |
Current report
Acquisition or sale of assets, Officer or director change, Other events
|
Jul 1, 2025 | Jul 1, 2025 |
| 11-K | Employee savings plan report | Jun 30, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 18, 2025 | Jun 18, 2025 |
| 8-K/A |
Amended current report
Shareholder vote results
|
Jun 3, 2025 | May 20, 2025 |
| S-8 | Employee stock plan registration | Jun 2, 2025 | — |
| 8-K |
Current report
Bylaw or fiscal year change
|
May 28, 2025 | May 23, 2025 |
| 8-K |
Current report
Other events
|
May 22, 2025 | May 22, 2025 |
| 8-K |
Current report
Shareholder vote results
|
May 20, 2025 | May 20, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
May 20, 2025 | May 20, 2025 |
| 424B3 | Prospectus | May 15, 2025 | — |
| 10-Q | Quarterly report | May 9, 2025 | Mar 31, 2025 |
| EFFECT | Filing | May 8, 2025 | — |
| 424B3 | Prospectus | May 8, 2025 | — |
| CORRESP | Letter to the SEC | May 6, 2025 | — |
| S-4/A | Filing | May 6, 2025 | — |
| 4 | Insider transaction | May 6, 2025 | May 6, 2025 |
| 4 | Insider transaction | May 6, 2025 | May 5, 2025 |
| UPLOAD | Letter from the SEC | May 1, 2025 | — |
| ARS | Annual report to shareholders | Apr 25, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Apr 23, 2025 | Apr 23, 2025 |
| S-4 | Registration for a merger or exchange | Apr 23, 2025 | — |
| DEF 14A | Proxy statement | Apr 18, 2025 | May 20, 2025 |
| 8-K |
Current report
Other events
|
Apr 15, 2025 | Apr 15, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Mar 31, 2025 |
| PRE 14A | Preliminary proxy statement | Apr 1, 2025 | May 20, 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 |
| 8-K |
Current report
Other events
|
Apr 1, 2025 | Apr 1, 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 |
| 10-K | Annual report | Mar 6, 2025 | Dec 31, 2024 |
| 425 | Filing | Feb 26, 2025 | — |
| 425 | Filing | Feb 25, 2025 | — |
| 8-K |
Current report
Material agreement, Other events
|
Feb 25, 2025 | Feb 24, 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 |
| 8-K |
Current report
Results of operations
|
Jan 22, 2025 | Jan 22, 2025 |
| 8-K |
Current report
Other events
|
Jan 21, 2025 | Jan 21, 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 |
| 8-K |
Current report
Other events
|
Jan 2, 2025 | Jan 2, 2025 |
| 4 | Insider transaction | Dec 26, 2024 | Dec 23, 2024 |
| 8-K/A |
Amended current report
Other events
|
Dec 20, 2024 | Dec 17, 2024 |
| 8-K |
Current report
Other events
|
Dec 17, 2024 | Dec 17, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 9, 2024 | Dec 6, 2024 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 13, 2024 | — |
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.