OSBC - CIK 0000357173
OLD SECOND BANCORP INC has filed 1,839 documents with the SEC between 1995 and 2026. The most frequent type is insider trade (1,008 filings), alongside the regular cadence of annual reports, quarterly reports, and event disclosures every public company must make. Use the filters to focus on one filing type, or flip the sort to trace the company's history from its earliest paperwork.
Data parsed from SEC EDGAR XBRL filings. See the full market cap rankings.
| Filing | Type | Filed | Period covered |
|---|---|---|---|
| Insider trade | 4 | 2026-05-26 | 2026-05-22 |
| Insider trade | 4 | 2026-05-21 | 2026-05-21 |
| Major company event | 8-K | 2026-05-20 | 2026-05-19 |
| Major company event | 8-K | 2026-05-19 | 2026-05-19 |
| Insider trade | 4 | 2026-05-12 | 2026-05-11 |
| Insider trade | 4 | 2026-05-11 | 2026-05-11 |
| Insider trade | 4 | 2026-05-11 | 2026-05-08 |
| Quarterly report | 10-Q | 2026-05-07 | 2026-03-31 |
| Major company event | 8-K | 2026-04-22 | 2026-04-22 |
| Major company event | 8-K | 2026-04-21 | 2026-04-21 |
| Annual report to shareholders | ARS | 2026-04-06 | 2025-12-31 |
| Proxy materials | DEFA14A | 2026-04-06 | - |
| Proxy statement | DEF 14A | 2026-04-06 | 2026-05-19 |
| Insider trade | 4 | 2026-04-02 | 2026-03-31 |
| Insider trade | 4 | 2026-04-02 | 2026-03-31 |
| Insider trade | 4 | 2026-04-02 | 2026-03-31 |
| Insider trade | 4 | 2026-04-02 | 2026-03-31 |
| Insider trade | 4 | 2026-04-02 | 2026-03-31 |
| Major company event | 8-K | 2026-04-01 | 2026-04-01 |
| SCHEDULE 13G/A | - | 2026-03-27 | - |
| Insider trade | 4 | 2026-03-23 | 2026-03-20 |
| Insider trade | 4 | 2026-03-04 | 2026-03-02 |
| Insider trade | 4 | 2026-03-04 | 2026-03-02 |
| Insider trade | 4 | 2026-03-04 | 2026-03-02 |
| Insider trade | 4 | 2026-03-04 | 2026-03-02 |
| Insider trade | 4 | 2026-03-04 | 2026-03-02 |
| Major company event | 8-K | 2026-03-04 | 2026-03-04 |
| Annual report | 10-K | 2026-02-26 | 2025-12-31 |
| Insider trade | 4 | 2026-02-24 | 2026-02-17 |
| Insider trade | 4 | 2026-02-24 | 2026-02-17 |
| Insider trade | 4 | 2026-02-24 | 2026-02-17 |
| Insider trade | 4 | 2026-02-24 | 2026-02-17 |
| Insider trade | 4 | 2026-02-24 | 2026-02-17 |
| Insider trade | 4 | 2026-02-24 | 2026-02-17 |
| Insider trade | 4 | 2026-02-24 | 2026-02-17 |
| Insider trade | 4 | 2026-02-24 | 2026-02-17 |
| Insider trade | 4 | 2026-02-24 | 2026-02-17 |
| Insider trade | 4 | 2026-02-24 | 2026-02-17 |
| Insider trade | 4 | 2026-02-24 | 2026-02-17 |
| Insider trade | 4 | 2026-02-24 | 2026-02-17 |
| Insider trade | 4 | 2026-02-24 | 2026-02-21 |
| Insider trade | 4 | 2026-02-24 | 2026-02-17 |
| Insider trade | 4 | 2026-02-24 | 2026-02-17 |
| Insider trade | 4 | 2026-02-19 | 2026-02-18 |
| Insider trade | 4 | 2026-02-18 | 2026-02-13 |
| Insider trade | 4 | 2026-02-10 | 2026-02-09 |
| Insider trade | 4 | 2026-02-05 | 2026-02-05 |
| Major company event | 8-K | 2026-01-29 | 2026-01-29 |
| Major company event | 8-K | 2026-01-21 | 2026-01-21 |
| Major company event | 8-K | 2026-01-20 | 2026-01-20 |