OLD SECOND BANCORP INC

For the period ended Jun 30, 2026. Filed Aug 6, 2026.

About this filing

A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Jun 30, 2026 · Filed Aug 6, 2026

OSBC$25.09+2.8%Stored close · as of Nov 9, 2026

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Contents

Item 6. Exhibits

Exhibits:



31.1	Certification of Chief Executive Officer Pursuant to Rule 13a-14(a)/15d-14(a).

31.2	Certification of Chief Financial Officer Pursuant to Rule 13a-14(a)/15d-14(a).

32.1	Certification of Chief Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

32.2	Certification of Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

101	Interactive data files pursuant to Rule 405 of Regulation S-T: (i) Consolidated Balance Sheets at June 30, 2026, and December 31, 2025; (ii) Consolidated Statements of Income for the three and six months ended June 30, 2026 and 2025; (iii) Consolidated Statements of Comprehensive Income (Loss) for the three and six months ended June 30, 2026 and 2025; (iv) Consolidated Statements of Cash Flows for the six months ended June 30, 2026 and 2025; (v) Consolidated Statements of Stockholders’ Equity for the three and six months ended June 30, 2026 and 2025; and (vi) Notes to Consolidated Financial Statements, tagged as blocks of text and in detail.

104	Cover Page Interactive Data File (the cover page XBRL tags are embedded within the Inline XBRL document).

Schedules and similar attachments have been omitted pursuant to Item 601(b)(2) of Regulation S-K. The Registrant will furnish supplementally a copy of any omitted schedules or similar attachment to the SEC upon request.

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