Company: OSBC
Filing Date: 2025-05-08
Form Type: 424B3
Source: 0001104659-25-046065
Chunk: 241

Company: OLD SECOND BANCORP INC
Filing Date: 2025-05-08
Form: 424B3
Chunk 241
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 unobservable inputs, the resulting fair value measurement is categorized as a Level 3 measurement. Note 14. Earnings Per Share Basic earnings per share is computed by dividing net income for the period by the weighted average number of common shares outstanding. Diluted earnings per common share is computed using the treasury stock method and reflects the potential dilution that could occur if stock-based awards from the Company’s Incentive Compensation Plan were exercised or issued. Earnings per common share have been computed as follows:

| ​                                                                             
 ​                                                                             | ​ 
 ​ | ​ 
 ​ | For the years ended December 31, 
 2024                             |   |           |   | ​ | ​ | 2023 |   |           |   | ​ 
 ​ |
|:------------------------------------------------------------------------------|:--|:--|:---------------------------------|:--|----------:|:--|:--|:--|:-----|:--|----------:|:--|:--|
| Net income available to common stockholders                                   | ​ | ​ | ​                                | $ | 5,083,769 | ​ | ​ | ​ | ​    | $ | 5,790,183 | ​ | ​ |
| Weighted average number of common shares outstanding for basic EPS            | ​ | ​ | ​                                | ​ | 2,793,912 | ​ | ​ | ​ | ​    | ​ | 2,770,059 | ​ | ​ |
| Dilutive effect of stock based awards                                         | ​ | ​ | ​                                | ​ |   187,669 | ​ | ​ | ​ | ​    | ​ |   176,568 | ​ | ​ |
| Weighted average number of common and potential common shares for diluted EPS | ​ | ​ | ​                                | ​ | 2,981,581 | ​ | ​ | ​ | ​    | ​ | 2,946,627 | ​ | ​ |
| Basic earnings per common share                                               | ​ | ​ | ​                                | $ |      1.82 | ​ | ​ | ​ | ​    | $ |      2.09 | ​ | ​ |
| Diluted earnings per common share                                             | ​ | ​ | ​                                | $ |      1.71 | ​ | ​ | ​ | ​    | $ |      1.97 | ​ | ​ |

There were no anti-dilutive shares in the 2024 or 2023 computations.

F-36

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