OSBC Old Second Bancorp Inc.

NASDAQ

$24.40

Old Second Bancorp Inc. (OSBC) SEC Filings

Everything OSBC has filed with the SEC, newest first. An 8-K shows what it was about where we have classified it — an earnings release and a change of chief executive are both 8-Ks, and the form number alone doesn't separate them.

100 filings
Date	Form	Filing
Nov 4, 2026	10-Q	View filing
Oct 30, 2026	SCHEDULE 13G	View filing
Oct 21, 2026	4	View filing
Oct 21, 2026	8-K Earnings Release · Other	View filing
Oct 21, 2026	4/A	View filing
Oct 21, 2026	4/A	View filing
Oct 20, 2026	4/A	View filing
Oct 20, 2026	4/A	View filing
Oct 20, 2026	4/A	View filing
Oct 20, 2026	4/A	View filing
Oct 20, 2026	4/A	View filing
Oct 20, 2026	4/A	View filing
Oct 20, 2026	8-K Other · Other Event	View filing
Oct 20, 2026	4/A	View filing
Oct 19, 2026	8-K Executive Change	View filing
Oct 8, 2026	SCHEDULE 13G	View filing
Oct 1, 2026	4	View filing
Oct 1, 2026	4	View filing
Oct 1, 2026	4	View filing
Oct 1, 2026	4	View filing
Oct 1, 2026	4	View filing
Oct 1, 2026	8-K Earnings Date Announcement · Other Event	View filing
Sep 23, 2026	4	View filing
Sep 23, 2026	144	View filing
Sep 11, 2026	4	View filing
Sep 8, 2026	4	View filing
Sep 8, 2026	4/A	View filing
Sep 8, 2026	144	View filing
Sep 3, 2026	4	View filing
Sep 3, 2026	4	View filing
Sep 2, 2026	144	View filing
Aug 13, 2026	4	View filing
Aug 12, 2026	4	View filing
Aug 11, 2026	4	View filing
Aug 6, 2026	10-Q	View filing
Jul 2, 2026	4	View filing
Jul 2, 2026	4	View filing
Jul 2, 2026	4	View filing
Jul 2, 2026	4	View filing
Jul 2, 2026	4	View filing
May 26, 2026	4	View filing
May 21, 2026	4	View filing
May 12, 2026	4	View filing
May 11, 2026	4	View filing
May 11, 2026	4	View filing
May 7, 2026	10-Q	View filing
Apr 2, 2026	4	View filing
Apr 2, 2026	4	View filing
Apr 2, 2026	4	View filing
Apr 2, 2026	4	View filing
Apr 2, 2026	4	View filing
Mar 23, 2026	4	View filing
Mar 4, 2026	4	View filing
Mar 4, 2026	4	View filing
Mar 4, 2026	4	View filing
Mar 4, 2026	4	View filing
Mar 4, 2026	4	View filing
Feb 26, 2026	10-K	View filing
Feb 24, 2026	4	View filing
Feb 24, 2026	4	View filing
Feb 24, 2026	4	View filing
Feb 24, 2026	4	View filing
Feb 24, 2026	4	View filing
Feb 24, 2026	4	View filing
Feb 24, 2026	4	View filing
Feb 24, 2026	4	View filing
Feb 24, 2026	4	View filing
Feb 24, 2026	4	View filing
Feb 24, 2026	4	View filing
Feb 24, 2026	4	View filing
Feb 24, 2026	4	View filing
Feb 24, 2026	4	View filing
Feb 24, 2026	4	View filing
Feb 19, 2026	4	View filing
Feb 18, 2026	4	View filing
Feb 10, 2026	4	View filing
Feb 5, 2026	4	View filing
Jan 16, 2026	4	View filing
Jan 5, 2026	4	View filing
Jan 5, 2026	4	View filing
Jan 5, 2026	4	View filing
Jan 5, 2026	4	View filing
Jan 5, 2026	4	View filing
Dec 9, 2025	4	View filing
Nov 26, 2025	4	View filing
Nov 13, 2025	4	View filing
Nov 7, 2025	4	View filing
Nov 6, 2025	10-Q	View filing
Oct 1, 2025	4	View filing
Oct 1, 2025	4	View filing
Oct 1, 2025	4	View filing
Oct 1, 2025	4	View filing
Oct 1, 2025	4	View filing
Aug 7, 2025	10-Q	View filing
May 9, 2025	10-Q	View filing
Mar 6, 2025	10-K	View filing
Nov 7, 2024	10-Q	View filing
Aug 8, 2024	10-Q	View filing
May 9, 2024	10-Q	View filing
Mar 7, 2024	10-K	View filing

Filings are sourced from EDGAR and open on the SEC's own site. Classification of 8-K events is ours and is not part of the filing.