OLD SECOND BANCORP INC

For the period ended Sep 30, 2025. Filed Nov 6, 2025.

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.

Sep 30, 2025 · Filed Nov 6, 2025

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

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Contents

Item 6. Exhibits

Exhibits:



2.1	Agreement and Plan of Merger between Old Second Bancorp, Inc. and Bancorp Financial, Inc. dated as of February 24, 2025 (incorporated by reference to Exhibit 2.1 of the Old Second Bancorp, Inc. Current Report on Form 8-K filed on February 25, 2025) +

10.1	Executive Employment Agreement, dated February 24, 2025, between Old Second Bancorp, Inc. and Darin Campbell. +

10.2	Compensation and Benefits Assurance Agreement, dated July 1, 2025, between Old Second Bancorp, Inc. and Darin Campbell. +

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 September 30, 2025, and December 31, 2024; (ii) Consolidated Statements of Income for the three and nine months ended September 30, 2025 and 2024; (iii) Consolidated Statements of Comprehensive Income (Loss) for the three and nine months ended September 30, 2025 and 2024; (iv) Consolidated Statements of Cash Flows for the nine months ended September 30, 2025 and 2024; (v) Consolidated Statements of Stockholders’ Equity for the three and nine months ended September 30, 2025 and 2024; 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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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.