Company: OSBC
Filing Date: 2025-05-08
Form Type: 424B3
Source: 0001104659-25-046065
Chunk: 200

Company: OLD SECOND BANCORP INC
Filing Date: 2025-05-08
Form: 424B3
Chunk 200
---
 evaluated subsequent events for potential recognition and/or disclosure through April 15, 2025, the date the consolidated financial statements were available to be issued. On February 24, 2025, the Company and Old Second entered into an Agreement and Plan of Merger (the “merger agreement”). The merger agreement provides that, upon the terms and subject to the conditions set forth therein, the Company will merge with and into Old Second, with Old Second continuing as the surviving entity (the “merger”). Immediately following the merger, the Bank will merge with and into Old Second National Bank, a national banking association and wholly-owned subsidiary of Old Second, with Old Second National Bank continuing as the surviving bank (the “bank merger”). Subject to the terms and conditions of the merger agreement, at the effective time of the merger, each stockholder of the Company will receive 2.5814 shares of Old Second common stock and $15.93 in cash for each share of the Company’s common stock owned by the stockholder. Holders of the Company’s common stock, subject to certain exceptions, will also be entitled to receive cash in lieu of fractional shares of Old Second common stock. The parties to the merger expect to complete the merger in the third quarter of 2025, subject to satisfaction of closing conditions, including receipt of customary required regulatory approvals and the approval of the merger agreement by the Company’s stockholders. Note 2. Securities Carrying amounts and fair values of securities available for sale are summarized as follows:

| December 31, 2024                      | ​ | ​ | AmortizedCost |   |             |   | ​ | ​ | GrossUnrealizedGains |   |        |   | ​ | ​ | GrossUnrealizedLosses |   |            |   | ​ | ​ | FairValue |   |             |   | ​ |
|:---------------------------------------|:--|:--|:--------------|:--|------------:|:--|:--|:--|:---------------------|:--|-------:|:--|:--|:--|:----------------------|:--|-----------:|:--|:--|:--|:----------|:--|------------:|:--|:--|
| U.S. government sponsored agencies     | ​ | ​ | ​             | $ |  20,908,385 | ​ | ​ | ​ | ​                    | $ |      — | ​ | ​ | ​ | ​                     |