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 |
|---|---|---|---|
| 11-K | Employee savings plan report | Jun 29, 2026 | Dec 31, 2025 |
| 11-K | Employee savings plan report | Jun 30, 2025 | Dec 31, 2024 |
| EFFECT | Filing | May 8, 2025 | — |
| CORRESP | Letter to the SEC | May 6, 2025 | — |
| UPLOAD | Letter from the SEC | May 1, 2025 | — |
| 425 | Filing | Feb 26, 2025 | — |
| 425 | Filing | Feb 25, 2025 | — |
| 11-K | Employee savings plan report | Jun 28, 2024 | Dec 31, 2023 |
| EFFECT | Filing | Aug 28, 2023 | — |
| CORRESP | Letter to the SEC | Aug 24, 2023 | — |
| UPLOAD | Letter from the SEC | Aug 23, 2023 | — |
| 11-K | Employee savings plan report | Jun 30, 2023 | Dec 31, 2022 |
| 11-K | Employee savings plan report | Jun 30, 2022 | Dec 31, 2021 |
| EFFECT | Filing | Oct 21, 2021 | — |
| 425 | Filing | Oct 21, 2021 | — |
| CORRESP | Letter to the SEC | Oct 19, 2021 | — |
| 425 | Filing | Oct 15, 2021 | — |
| UPLOAD | Letter from the SEC | Oct 6, 2021 | — |
| 425 | Filing | Jul 27, 2021 | — |
| 425 | Filing | Jul 26, 2021 | — |
| 11-K | Employee savings plan report | Jun 25, 2021 | Dec 31, 2020 |
| D | Filing | Apr 20, 2021 | — |
| EFFECT | Filing | Aug 20, 2020 | — |
| CORRESP | Letter to the SEC | Aug 18, 2020 | — |
| UPLOAD | Letter from the SEC | Aug 14, 2020 | — |
| 11-K | Employee savings plan report | Jun 25, 2020 | Dec 31, 2019 |
| 15-12G | Deregistration | Mar 26, 2020 | — |
| 25-NSE | Delisting notice | Feb 28, 2020 | — |
| 11-K | Employee savings plan report | Jun 28, 2019 | Jun 28, 2019 |
| 11-K | Employee savings plan report | Jun 22, 2018 | Jun 22, 2018 |
| EFFECT | Filing | Aug 11, 2017 | — |
| CORRESP | Letter to the SEC | Aug 10, 2017 | — |
| UPLOAD | Letter from the SEC | Aug 8, 2017 | — |
| 11-K | Employee savings plan report | Jun 26, 2017 | Jun 26, 2017 |
| EFFECT | Filing | Dec 2, 2016 | — |
| CORRESP | Letter to the SEC | Dec 1, 2016 | — |
| UPLOAD | Letter from the SEC | Nov 15, 2016 | — |
| 11-K | Employee savings plan report | Jun 22, 2016 | Dec 31, 2015 |
Showing 38 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.