Old Second Bancorp, Inc.SEC Filings
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All SEC filings by Old Second Bancorp, Inc. (OSBC) — annual and quarterly reports, current reports, registrations, proxies and ownership forms, updated in real time.
Financials
| 10-Q | Quarterly report | View Diff | Aug 6, 2026 | |
| 10-Q | Quarterly report | View Diff | May 7, 2026 | |
| ARS | Annual report to shareholders | Apr 6, 2026 | ||
| 10-K | Annual report | View Diff | Feb 26, 2026 | |
| 10-Q | Quarterly report | View Diff | Nov 6, 2025 | |
| 10-Q | Quarterly report | View Diff | Aug 7, 2025 | |
| 10-Q | Quarterly report | View Diff | May 9, 2025 | |
| ARS | Annual report to shareholders | Apr 25, 2025 | ||
| 10-K | Annual report | View Diff | Mar 6, 2025 | |
| 10-Q | Quarterly report | View Diff | Nov 7, 2024 |
Events
| 8-K | Old Second Bancorp, Inc. Reports Second Quarter 2026 Net Income of $28.2 Million,or $0.54 Per Diluted Share | Jul 22, 2026 | ||
| 8-K | Current report | Jul 21, 2026 | ||
| 8-K | Current report | Jul 8, 2026 | ||
| 8-K | Current report | Jul 1, 2026 | ||
| 8-K | Current report | Jun 25, 2026 | ||
| 8-K | Current report | Jun 9, 2026 | ||
| 8-K | Submission of Matters to a Vote of Security Holders | May 20, 2026 | ||
| 8-K | Regulation Fd Disclosure | May 19, 2026 | ||
| 8-K | Results of Operations and Financial Condition | Apr 22, 2026 | ||
| 8-K | Other Events | Apr 21, 2026 |
Registrations and Prospectuses
| S-3ASR | Automatic shelf registration | Aug 18, 2026 | ||
| S-8 | Registration of securities for employees | Jun 2, 2025 | ||
| 424B3 | Prospectus supplement | May 15, 2025 | ||
| 424B3 | Prospectus supplement | May 8, 2025 | ||
| S-4/A | Registration of securities issued in business combination transactions | View Diff | May 6, 2025 | |
| S-4 | Registration of securities issued in business combination transactions | Apr 23, 2025 | ||
| 425 | Business combination disclosure | Feb 25, 2025 | ||
| 425 | Business combination disclosure | Feb 25, 2025 | ||
| S-3/A | Shelf registration | View Diff | Aug 24, 2023 | |
| S-3 | Shelf registration | Aug 18, 2023 |
Proxies
| DEFA14A | Annual Meeting | Apr 6, 2026 | ||
| DEF 14A | Annual Meeting of Shareholders | View Diff | Apr 6, 2026 | |
| DEF 14A | Definitive proxy | View Diff | Apr 18, 2025 | |
| PRE 14A | Preliminary proxy | Apr 1, 2025 | ||
| DEF 14A | Definitive proxy | View Diff | Apr 19, 2024 | |
| DEF 14A | Definitive proxy | View Diff | Apr 14, 2023 | |
| DEF 14A | Definitive proxy | View Diff | Apr 14, 2022 | |
| DEF 14A | Definitive proxy | View Diff | Apr 16, 2021 | |
| DEF 14A | Definitive proxy | View Diff | Jul 17, 2020 | |
| DEF 14A | Definitive proxy | View Diff | Apr 19, 2019 |
Other
| EFFECT | Notice of effectiveness | May 9, 2025 | ||
| CORRESP | Correspondence with SEC | May 6, 2025 | ||
| UPLOAD | Letter from SEC | May 1, 2025 | ||
| EFFECT | Notice of effectiveness | Aug 29, 2023 | ||
| CORRESP | Correspondence with SEC | Aug 24, 2023 | ||
| UPLOAD | Letter from SEC | Aug 23, 2023 | ||
| EFFECT | Notice of effectiveness | Oct 22, 2021 | ||
| CORRESP | Correspondence with SEC | Oct 19, 2021 | ||
| UPLOAD | Letter from SEC | Oct 6, 2021 | ||
| EFFECT | Notice of effectiveness | Aug 21, 2020 |
Ownership
| 4 | Collins Gary S | Sep 11, 2026 | ||
| 4 | Mclean Hugh H | Sep 8, 2026 | ||
| 4/A | Mclean Hugh H | Sep 8, 2026 | ||
| 144 | Notice of proposed sale of securities | Sep 8, 2026 | ||
| 4 | Mclean Hugh H | Sep 3, 2026 | ||
| 4 | Campbell Darin Patrick | Sep 3, 2026 | ||
| 144 | Notice of proposed sale of securities | Sep 2, 2026 | ||
| 4 | Eccher James | Aug 13, 2026 | ||
| 4 | Eccher James | Aug 12, 2026 | ||
| 4 | Lyons Billy J Jr. | Aug 11, 2026 |