Company: OSBC
Filing Date: 2025-04-23
Form Type: S-4
Source: 0001104659-25-037832
Chunk: 179

Company: OLD SECOND BANCORP INC
Filing Date: 2025-04-23
Form: S-4
Chunk 179
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| ​ | Consolidated Statements of Cash Flows           | ​ | ​ | F-9        | ​ |
| ​ | Notes to Consolidated Financial Statements      | ​ | ​ | F-10– F-36 | ​ |

F-2

TABLE OF CONTENTS

#### Independent Auditor’s Report
Board of Directors 
 Bancorp Financial, Inc. and Subsidiary

### Report on the Audit of the Financial Statements

#### Opinion
We have audited the consolidated financial statements of Bancorp Financial, Inc. and its Subsidiary (the Company), which comprise the consolidated balance sheets as of December 31, 2024 and 2023, the related consolidated statements of income, comprehensive income, stockholders’ equity, and cash flows for the years then ended, and the related notes to the consolidated financial statements (collectively, the financial statements).

In our opinion, the accompanying financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of their operations and their cash flows for the years then ended in accordance with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with auditing standards generally accepted in the United States of America (GAAS), the Company’s internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission in 2013, and our report dated April 15, 2025, expressed an unmodified opinion on the effectiveness of the Company’s internal control over financial reporting.

#### Basis for Opinion
We conducted our audits in accordance with GAAS. Our responsibilities under those standards are further described in the “Auditor’s Responsibilities for the Audit of the Financial Statements” section of our report. We are required to be independent of the Company and to meet our other ethical responsibilities, in accordance with the relevant ethical requirements relating to our audits. We believe that the audit evidence we have obtained is sufficient and appropriate to provide a basis for our audit opinion.

### Responsibilities of Management for the Financial Statements
Management is responsible for the preparation and fair presentation of the financial statements in accordance with accounting principles generally accepted in the United States of America, and for the design, implementation, and maintenance of internal control relevant to the preparation and fair presentation of financial statements that are free from material misstatement, whether due to fraud or error