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 |
|---|---|---|---|
| S-3ASR | Automatic shelf registration | Aug 18, 2026 | — |
| S-8 | Employee stock plan registration | Jun 2, 2025 | — |
| 424B3 | Prospectus | May 15, 2025 | — |
| 424B3 | Prospectus | May 8, 2025 | — |
| S-4/A | Filing | May 6, 2025 | — |
| S-4 | Registration for a merger or exchange | Apr 23, 2025 | — |
| S-3/A | Filing | Aug 24, 2023 | — |
| S-3 | Shelf registration | Aug 18, 2023 | — |
| 424B3 | Prospectus | Oct 25, 2021 | — |
| S-4/A | Filing | Oct 19, 2021 | — |
| S-4 | Registration for a merger or exchange | Oct 1, 2021 | — |
| S-8 | Employee stock plan registration | Aug 18, 2021 | — |
| S-3 | Shelf registration | Aug 10, 2020 | — |
| S-8 | Employee stock plan registration | May 29, 2019 | — |
| S-3 | Shelf registration | Aug 3, 2017 | — |
| 424B5 | Prospectus supplement | Dec 13, 2016 | — |
| FWP | Free writing prospectus | Dec 12, 2016 | — |
| FWP | Free writing prospectus | Dec 12, 2016 | — |
| 424B5 | Prospectus supplement | Dec 12, 2016 | — |
| S-3/A | Filing | Nov 30, 2016 | — |
| S-3 | Shelf registration | Nov 4, 2016 | — |
Showing 21 filings. 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.