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 |
| 8-K |
Current report
Results of operations
|
Oct 21, 2026 | Oct 21, 2026 |
| 8-K |
Current report
Other events
|
Oct 20, 2026 | Oct 20, 2026 |
| 8-K |
Current report
Officer or director change
|
Oct 19, 2026 | Oct 14, 2026 |
| 8-K |
Current report
Other events
|
Oct 1, 2026 | Oct 1, 2026 |
| S-3ASR | Automatic shelf registration | Aug 18, 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 |
| 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 |
| 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 |
| 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 |
| 8-K |
Current report
Other events
|
Apr 1, 2026 | Apr 1, 2026 |
| 8-K |
Current report
Other events
|
Mar 4, 2026 | Mar 4, 2026 |
| 10-K | Annual report | Feb 26, 2026 | Dec 31, 2025 |
| 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 |
| 8-K |
Current report
Other events
|
Jan 2, 2026 | Jan 2, 2026 |
| 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 |
| 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 |
| 8-K |
Current report
Results of operations
|
Jul 23, 2025 | Jul 23, 2025 |
| 8-K |
Current report
Other events
|
Jul 15, 2025 | Jul 15, 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 | — |
| 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 |
| PRE 14A | Preliminary proxy statement | Apr 1, 2025 | May 20, 2025 |
| 8-K |
Current report
Other events
|
Apr 1, 2025 | Apr 1, 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 |
| 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 |
| 8-K |
Current report
Other events
|
Jan 2, 2025 | Jan 2, 2025 |
| 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 |
| 10-Q | Quarterly report | Nov 7, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Oct 16, 2024 | Oct 16, 2024 |
| 8-K |
Current report
Other events
|
Oct 15, 2024 | Oct 15, 2024 |
| 8-K |
Current report
Other events
|
Oct 1, 2024 | Oct 1, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 27, 2024 | Aug 26, 2024 |
| 10-Q | Quarterly report | Aug 8, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Jul 17, 2024 | Jul 17, 2024 |
| 8-K |
Current report
Other events
|
Jul 16, 2024 | Jul 16, 2024 |
| 8-K |
Current report
Other events
|
Jul 1, 2024 | Jul 1, 2024 |
| 11-K | Employee savings plan report | Jun 28, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Shareholder vote results
|
May 23, 2024 | May 21, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
May 21, 2024 | May 21, 2024 |
| 10-Q | Quarterly report | May 9, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
May 8, 2024 | May 8, 2024 |
| ARS | Annual report to shareholders | Apr 19, 2024 | Dec 31, 2023 |
| DEF 14A | Proxy statement | Apr 19, 2024 | May 21, 2024 |
| 8-K |
Current report
Results of operations
|
Apr 17, 2024 | Apr 17, 2024 |
| 8-K |
Current report
Other events
|
Apr 16, 2024 | Apr 16, 2024 |
| 8-K |
Current report
Other events
|
Apr 1, 2024 | Apr 1, 2024 |
| 8-K |
Current report
Officer or director change
|
Mar 26, 2024 | Mar 20, 2024 |
| 10-K | Annual report | Mar 7, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations
|
Jan 24, 2024 | Jan 24, 2024 |
| 8-K |
Current report
Other events
|
Jan 16, 2024 | Jan 16, 2024 |
| 8-K |
Current report
Other events
|
Jan 3, 2024 | Jan 3, 2024 |
| 8-K |
Current report
Other events
|
Jan 2, 2024 | Jan 2, 2024 |
| 10-Q | Quarterly report | Nov 8, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Officer or director change
|
Oct 27, 2023 | Oct 27, 2023 |
| 8-K |
Current report
Results of operations
|
Oct 18, 2023 | Oct 18, 2023 |
| 8-K |
Current report
Other events
|
Oct 17, 2023 | Oct 17, 2023 |
| 8-K |
Current report
Other events
|
Oct 2, 2023 | Oct 2, 2023 |
| 8-K |
Current report
Officer or director change
|
Sep 11, 2023 | Sep 8, 2023 |
| EFFECT | Filing | Aug 28, 2023 | — |
| CORRESP | Letter to the SEC | Aug 24, 2023 | — |
| S-3/A | Filing | Aug 24, 2023 | — |
| UPLOAD | Letter from the SEC | Aug 23, 2023 | — |
| S-3 | Shelf registration | Aug 18, 2023 | — |
| 8-K |
Current report
Officer or director change
|
Aug 15, 2023 | Aug 15, 2023 |
| 10-Q | Quarterly report | Aug 8, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 7, 2023 | Aug 7, 2023 |
| 8-K |
Current report
Results of operations
|
Jul 19, 2023 | Jul 19, 2023 |
| 8-K |
Current report
Other events
|
Jul 18, 2023 | Jul 18, 2023 |
| 8-K |
Current report
Officer or director change
|
Jul 12, 2023 | Jul 12, 2023 |
| 8-K |
Current report
Other events
|
Jul 3, 2023 | Jul 3, 2023 |
| 11-K | Employee savings plan report | Jun 30, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Other events
|
May 25, 2023 | May 25, 2023 |
| 8-K |
Current report
Shareholder vote results
|
May 24, 2023 | May 23, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
May 23, 2023 | May 23, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
May 15, 2023 | May 15, 2023 |
| 10-Q | Quarterly report | May 9, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Results of operations
|
Apr 19, 2023 | Apr 19, 2023 |
| 8-K |
Current report
Other events
|
Apr 18, 2023 | Apr 18, 2023 |
| ARS | Annual report to shareholders | Apr 14, 2023 | Dec 31, 2022 |
| DEF 14A | Proxy statement | Apr 14, 2023 | — |
| 8-K |
Current report
Other events
|
Apr 3, 2023 | Apr 3, 2023 |
| 10-K | Annual report | Mar 9, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Results of operations
|
Jan 25, 2023 | Jan 25, 2023 |
| 8-K |
Current report
Officer or director change, Other events
|
Jan 17, 2023 | Jan 13, 2023 |
| 8-K |
Current report
Other events
|
Jan 3, 2023 | Jan 3, 2023 |
| 10-Q | Quarterly report | Nov 8, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Officer or director change
|
Oct 27, 2022 | Oct 25, 2022 |
| 8-K |
Current report
Results of operations
|
Oct 26, 2022 | Oct 26, 2022 |
| 8-K |
Current report
Other events
|
Oct 18, 2022 | Oct 18, 2022 |
| 8-K |
Current report
Other events
|
Oct 3, 2022 | Oct 3, 2022 |
| 10-Q | Quarterly report | Aug 8, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Results of operations
|
Jul 27, 2022 | Jul 27, 2022 |
| 8-K |
Current report
Other events
|
Jul 19, 2022 | Jul 19, 2022 |
| 8-K |
Current report
Other events
|
Jul 1, 2022 | Jul 1, 2022 |
| 11-K | Employee savings plan report | Jun 30, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Shareholder vote results, Other events
|
May 18, 2022 | May 17, 2022 |
| 8-K |
Current report
Regulation FD disclosure
|
May 17, 2022 | May 17, 2022 |
| 10-Q | Quarterly report | May 9, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations
|
Apr 27, 2022 | Apr 27, 2022 |
| 8-K/A |
Amended current report
Other events
|
Apr 20, 2022 | Apr 19, 2022 |
| 8-K |
Current report
Other events
|
Apr 19, 2022 | Apr 19, 2022 |
| DEF 14A | Proxy statement | Apr 14, 2022 | Apr 14, 2022 |
| 8-K |
Current report
Other events
|
Apr 1, 2022 | Apr 1, 2022 |
| 10-K | Annual report | Mar 10, 2022 | Dec 31, 2021 |
| 8-K/A | Amended current report | Feb 16, 2022 | Dec 1, 2021 |
| 8-K |
Current report
Results of operations
|
Jan 26, 2022 | Jan 26, 2022 |
| 8-K |
Current report
Other events
|
Jan 18, 2022 | Jan 18, 2022 |
| 8-K |
Current report
Other events
|
Jan 3, 2022 | Jan 3, 2022 |
| 8-K |
Current report
Acquisition or sale of assets, Officer or director change, Other events
|
Dec 1, 2021 | Dec 1, 2021 |
| 8-K |
Current report
Shareholder vote results, Regulation FD disclosure
|
Nov 30, 2021 | Nov 30, 2021 |
| 10-Q | Quarterly report | Nov 5, 2021 | Sep 30, 2021 |
| 424B3 | Prospectus | Oct 25, 2021 | — |
| EFFECT | Filing | Oct 21, 2021 | — |
| 425 | Filing | Oct 21, 2021 | — |
| 8-K | Current report | Oct 21, 2021 | Oct 20, 2021 |
| CORRESP | Letter to the SEC | Oct 19, 2021 | — |
| 8-K |
Current report
Other events
|
Oct 19, 2021 | Oct 19, 2021 |
| S-4/A | Filing | Oct 19, 2021 | — |
| 425 | Filing | Oct 15, 2021 | — |
| 8-K |
Current report
Other events
|
Oct 15, 2021 | Oct 14, 2021 |
| UPLOAD | Letter from the SEC | Oct 6, 2021 | — |
| S-4 | Registration for a merger or exchange | Oct 1, 2021 | — |
| 8-K |
Current report
Other events
|
Oct 1, 2021 | Oct 1, 2021 |
| S-8 | Employee stock plan registration | Aug 18, 2021 | — |
| 8-K |
Current report
Officer or director change
|
Aug 17, 2021 | Aug 17, 2021 |
| 10-Q | Quarterly report | Aug 6, 2021 | Jun 30, 2021 |
| 425 | Filing | Jul 27, 2021 | — |
| 425 | Filing | Jul 26, 2021 | — |
| 8-K |
Current report
Material agreement, Other events
|
Jul 26, 2021 | Jul 25, 2021 |
| 8-K |
Current report
Results of operations
|
Jul 21, 2021 | Jul 21, 2021 |
| 8-K |
Current report
Other events
|
Jul 20, 2021 | Jul 20, 2021 |
| 8-K |
Current report
Other events
|
Jul 8, 2021 | Jul 7, 2021 |
| 11-K | Employee savings plan report | Jun 25, 2021 | Dec 31, 2020 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
May 19, 2021 | May 18, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
May 18, 2021 | May 18, 2021 |
| 10-Q | Quarterly report | May 7, 2021 | Mar 31, 2021 |
| 8-K |
Current report
Results of operations
|
Apr 21, 2021 | Apr 21, 2021 |
| D | Filing | Apr 20, 2021 | — |
| 8-K |
Current report
Other events
|
Apr 20, 2021 | Apr 20, 2021 |
| DEF 14A | Proxy statement | Apr 16, 2021 | May 18, 2021 |
| 8-K |
Current report
Material agreement, New debt, Regulation FD disclosure
|
Apr 8, 2021 | Apr 6, 2021 |
| 8-K |
Current report
Other events
|
Apr 1, 2021 | Apr 1, 2021 |
| 8-K |
Current report
Officer or director change
|
Mar 19, 2021 | Mar 16, 2021 |
| 10-K | Annual report | Mar 8, 2021 | Dec 31, 2020 |
| 8-K |
Current report
Officer or director change
|
Feb 18, 2021 | Feb 16, 2021 |
| 8-K |
Current report
Results of operations
|
Jan 27, 2021 | Jan 27, 2021 |
| 8-K |
Current report
Other events
|
Jan 19, 2021 | Jan 19, 2021 |
| 8-K |
Current report
Other events
|
Jan 4, 2021 | Jan 4, 2021 |
| 10-Q | Quarterly report | Nov 6, 2020 | Sep 30, 2020 |
| 8-K |
Current report
Results of operations, Other events
|
Oct 21, 2020 | Oct 21, 2020 |
| 8-K |
Current report
Officer or director change, Other events
|
Oct 19, 2020 | Oct 19, 2020 |
| 8-K |
Current report
Other events
|
Oct 1, 2020 | Oct 1, 2020 |
| 8-K |
Current report
Officer or director change
|
Sep 29, 2020 | Sep 23, 2020 |
| EFFECT | Filing | Aug 20, 2020 | — |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Aug 19, 2020 | Aug 18, 2020 |
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.