Company: OSBC
Filing Date: 2025-05-08
Form Type: 424B3
Source: 0001104659-25-046065
Chunk: 127

Company: OLD SECOND BANCORP INC
Filing Date: 2025-05-08
Form: 424B3
Chunk 127
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 | $ | -147,873 | ​ | ​ | ​ | ​                        | $ |  -42,930 | ​ | ​ | ​ | ​         | ​ | ​ | ​                | $ | 6,911,030 | ​ | ​ |

See accompanying Notes to the Unaudited Pro Forma Condensed Combined Financial Information 82

TABLE OF CONTENTS

UNAUDITED PRO FORMA CONDENSED COMBINED INCOME STATEMENT

| ​                                                                  | ​ | ​ | For the Twelve Months Ended December 31, 2024 |   |         |   |   |   |                            |   |         |   |   |   |                       |   |       |   |   |   |       |   |         |   |   |   |           |   |   |                   |   |         |   | ​ |
|:-------------------------------------------------------------------|:--|:--|:----------------------------------------------|:--|--------:|:--|:--|:--|:---------------------------|:--|--------:|:--|:--|:--|:----------------------|:--|------:|:--|:--|:--|:------|:--|--------:|:--|:--|:--|:----------|:--|:--|:------------------|:--|--------:|:--|:--|
| (in Thousands, except for per share data)                          | ​ | ​ | HistoricalOld Second                          |   |         |   | ​ | ​ | HistoricalBancorpFinancial |   |         |   | ​ | ​ | Fair ValueAdjustments |   |       |   | ​ | ​ | Other |   |         |   | ​ | ​ | Reference | ​ | ​ | Pro FormaCombined |   |         |   | ​ |
| Interest and dividend income                                       | ​ | ​ | ​                                             | ​ |       ​ | ​ | ​ | ​ | ​                          | ​ |       ​ | ​ | ​ | ​ | ​                     | ​ |     ​ | ​ | ​ | ​ | ​     | ​ |       ​ | ​ | ​ | ​ | ​         | ​ | ​ | ​                 | ​ |       ​ | ​ | ​ |
| Loans, including fees                                              | ​ | ​ | ​                                             | $ | 253,319 | ​ | ​ | ​ | ​                          | $ |  97,959 | ​ | ​ |