Company: OSBC
Filing Date: 2025-05-08
Form Type: 424B3
Source: 0001104659-25-046065
Chunk: 201

Company: OLD SECOND BANCORP INC
Filing Date: 2025-05-08
Form: 424B3
Chunk 201
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 | ​ | ​             | $ |  24,322,328 | ​ | ​ | ​ | ​                    | $ |  58,475 | ​ | ​ | ​ | ​                     | $ |  2,241,657 | ​ | ​ | ​ | ​         | $ |  22,139,146 | ​ | ​ |
| Residential mortgage-backed securities | ​ | ​ | ​             | ​ |  61,879,452 | ​ | ​ | ​ | ​                    | ​ |  56,589 | ​ | ​ | ​ | ​                     | ​ |  5,948,270 | ​ | ​ | ​ | ​         | ​ |  55,987,771 | ​ | ​ |
| Municipal bonds                        | ​ | ​ | ​             | ​ |  49,051,655 | ​ | ​ | ​ | ​                    | ​ | 352,581 | ​ | ​ | ​ | ​                     | ​ |  3,241,851 | ​ | ​ | ​ | ​         | ​ |  46,162,385 | ​ | ​ |
| Corporate and other securities         | ​ | ​ | ​             | ​ |   1,997,948 | ​ | ​ | ​ | ​                    | ​ |       — | ​ | ​ | ​ | ​                     | ​ |     93,908 | ​ | ​ | ​ | ​         | ​ |   1,904,040 | ​ | ​ |
| Total securities                       | ​ | ​ | ​             | $ | 137,251,383 | ​ | ​ | ​ | ​                    | $ | 467,645 | ​ | ​ | ​ | ​                     | $ | 11,525,686 | ​ | ​ | ​ | ​         | $ | 126,193,342 | ​ | ​ |

F-18

TABLE OF CONTENTS

Bancorp Financial, Inc. and Subsidiary Notes to Consolidated Financial Statements Note 2. Securities (continued) The following tables show the Company’s gross unrealized losses and fair value on investments, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:

| ​                                      
 Description of Securities              
 As of December 31, 2024:               | ​ 
 ​ 
 ​ | ​ 
 ​ 
 ​ | Continuous unrealizedlosses existing for lessthan 12 months 
 Fair