Company: OSBC
Filing Date: 2025-05-08
Form Type: 424B3
Source: 0001104659-25-046065
Chunk: 237

Company: OLD SECOND BANCORP INC
Filing Date: 2025-05-08
Form: 424B3
Chunk 237
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adjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date.

Level 2 : Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.

Level 3 : Significant unobservable inputs that reflect a reporting entity’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.

A description of the valuation methodologies used for assets and liabilities measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below.

Assets and Liabilities Recorded at Fair Value on a Recurring Basis

The following tables summarize assets and liabilities measured at fair value on a recurring basis as of December 31, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value:

<div align='center'>F-34</div>

TABLE OF CONTENTS

Bancorp Financial, Inc. and Subsidiary Notes to Consolidated Financial Statements Note 13. Fair Value Measurements (continued)

| ​                                      
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 ​ | ​ 
 ​ | Fair Value Measurements at December 31, 2024 Using 
 December 31,2024                                   |   |            |   | ​ | ​ | Quoted Prices inActive Markets forIdentical Assets(Level 1) |   |   |   | ​ | ​ | Significant OtherObservableInputs(Level 2) |   |            |   | ​ | ​ | Significant OtherUnobservableInputs(Level 3) |   |   |   | ​ 
 ​ |
|:---------------------------------------|:--|:--|:---------------------------------------------------|:--|-----------:|:--|:--|:--|:------------------------------------------------------------|:--|:--|:--|:--|:--|:-------------------------------------------|:--|-----------:|:--|:--|:--|:---------------------------------------------|:--|:--|:--|:--|
| Securities available for sale:         | ​ | ​ | ​                                                  | ​ |          ​ | ​ | ​ | ​ | ​                                                           | ​ | ​ | ​ | ​ | ​ | ​                                          | ​ |          ​ | ​ | ​ | ​ | ​                                            | ​ | ​ | ​ | ​ |
| U.S. government sponsored agencies     | ​ | ​ | ​                                                  |