Company: OSBC
Filing Date: 2025-04-01
Form Type: PRE 14A
Source: 0001558370-25-004277
Chunk: 104

Company: OLD SECOND BANCORP INC
Filing Date: 2025-04-01
Form: PRE 14A
Chunk 104
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 Barry Finn

Mr. Dennis Klaeser

Mr. John Ladowicz

Mr. Billy Lyons

Mr. Hugh McLean

Members of the Audit Committee

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### HOUSEHOLDING
The SEC has adopted rules that permit companies and intermediaries (e.g., brokers) to satisfy the delivery requirements for proxy statements and annual reports, or Notices Regarding the Availability of Proxy Materials, if applicable, with respect to two or more stockholders sharing the same address by delivering a single proxy statement and annual report, or Notice Regarding the Availability of Proxy Materials, if applicable, addressed to those stockholders. This process, which is commonly referred to as “householding,” potentially means extra convenience for stockholders and cost savings for companies. In accordance with these rules, only one proxy statement and annual report, or Notice Regarding the Availability of Proxy Materials, if applicable, may be delivered to multiple stockholders sharing an address unless we have received contrary instructions from one or more of the stockholders. Stockholders who currently receive multiple copies of the proxy statement and annual report at their address and would like to request “householding” of their communications should contact their broker if they are beneficial owners or direct their request to our Stockholder Relations Manager at the contact information below if they are registered holders.

If, at any time, you no longer wish to participate in “householding” and would prefer to receive a separate proxy statement and annual report, or Notice Regarding the Availability of Proxy Materials, if applicable, please notify your broker, if you are a beneficial owner or, if you are a registered holder, direct your written request to our Stockholder Relations Manager at the contact information below.

If requested, we will also promptly deliver, upon oral or written request, a separate copy of the proxy statement and annual report to any stockholder residing at an address to which only one copy was mailed. Please address such requests to our Stockholder Relations Manager at the contact information below.

<div align='center'>Stockholder Relations Manager, Shirley Cantrell

Old Second Bancorp, Inc.

37 S. River St.

Aurora, Illinois 60507

Telephone: 630-906-2303

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GENERAL We will bear the cost of this proxy solicitation. Solicitation will be made primarily through the use of the mail, but our officers, directors or employees may solicit proxies personally, by telephone or through any other mode of communication, without additional remuneration to our officers, directors or employees for such activity. In addition