Company: OSBC
Filing Date: 2025-05-08
Form Type: 424B3
Source: 0001104659-25-046065
Chunk: 178

Company: OLD SECOND BANCORP INC
Filing Date: 2025-05-08
Form: 424B3
Chunk 178
---
 statement and form of proxy relating to a meeting of stockholders must submit the proposal to Old Second in accordance with SEC Rule 14a-8. With respect to Old Second’s 2026 Annual Meeting of Stockholders, the deadline to submit a notice of a proposal and to include a proposal in Old Second’s proxy statement and form of proxy related to the meeting is December 20, 2025.

Under the Old Second charter, an Old Second stockholder seeking to nominate an individual for election as a director of Old Second must give written notice, delivered to the Corporate Secretary, at 37 South River Street, Aurora, Illinois 60507, not fewer than 14 days nor more than 60 days before any meeting of the stockholders called for the election of directors. If notice of the meeting is given to stockholders less than 21 days before the date of the meeting, such written nomination must be delivered or mailed, as prescribed, to our Corporate Secretary, not later than the close of business on the seventh day following the day on which notice of the meeting was mailed to stockholders.

In addition to satisfying the requirements under Old Second’s charter and bylaws, stockholders who intend to solicit proxies in support of director nominees other than Old Second’s nominees must also comply with the SEC’s universal proxy rules under Rule 14a-19 of the Securities Exchange Act of 1934, as amended.

<div align='center'>125</div>

TABLE OF CONTENTS

INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE The SEC allows Old Second to incorporate certain information into this proxy statement/prospectus by reference to other information that has been filed with the SEC. The information incorporated by reference is deemed to be part of this proxy statement/prospectus, except for any information that is superseded by information contained directly in this proxy statement/prospectus or by information contained in documents filed with or furnished to the SEC after the date of this proxy statement/prospectus. The documents that are incorporated by reference contain important information about Old Second and its financial condition and you should read this proxy statement/prospectus together with any other documents incorporated by reference in this proxy statement/prospectus. This proxy statement/prospectus incorporates by reference the following documents that have previously been filed with the SEC by Old Second (Central Index Key 00000357173), other than, in each case, documents or information deemed to have been furnished and not filed according to SEC rules:

| Old Second SEC Filings                     
 Annual Report on Form