Company: OSBC
Filing Date: 2025-05-06
Form Type: S-4/A
Source: 0001104659-25-045103
Chunk: 153

Company: OLD SECOND BANCORP INC
Filing Date: 2025-05-06
Form: S-4/A
Chunk 153
---

Net interest income, which is our primary source of earnings, is the difference between interest income and fees earned on interest-earning assets, such as loans and investment securities and interest incurred on interest-bearing liabilities, such as deposits and borrowings. Net interest income depends upon the relative mix of interest-earning assets and interest-bearing liabilities, the ratio of interest-earning assets to total assets and of interest-bearing liabilities to total funding sources, and movements in market interest rates. Our net interest income can be significantly influenced by a variety of factors, including overall loan demand, economic conditions, credit risk, the amount of nonearning assets, including nonperforming loans, the amounts of and rates at which assets and liabilities reprice, variances in prepayment of loans and securities, early withdrawal of deposits, exercise of call options on borrowings or securities, a general rise or decline in interest rates, changes in the slope of the yield-curve, and balance sheet growth or contraction. Our asset and liability committee seeks to manage interest rate risk under a variety of rate environments by structuring the balance sheet and off-balance sheet positions.

The following tables set forth certain information relating to our average consolidated balance sheets and reflects the yield on average interest-earning assets and cost of average interest-bearing liabilities for the periods indicated obtained by dividing the related interest by the average balance of assets or liabilities. Average balances are derived from daily balances.

<div align='center'>105</div>

TABLE OF CONTENTS

Analysis of Average Balances
Income/Expense and Rates
(Dollars in thousands-unaudited)

| ​                                          
 ​                                          | ​ 
 ​ | ​ 
 ​ | Year Ended December 31, 
 2024                    |   |           |   |   |   |                  |   |         |   |   |   |       |   |      |   | ​ | ​ | 2023           |   |           |   |   |   |                  |   |        |   |   |   |       |   |      |   | ​ 
 ​ |
|:-------------------------------------------|:--|:--|:------------------------|:--|----------:|:--|:--|:--|:-----------------|:--|--------:|:--|:--|:--|:------|:--|-----:|:--|:--|:--|:---------------|:--|----------:|:--|:--|:--|:-----------------|:--|-------