Company: OSBC
Filing Date: 2025-05-06
Form Type: S-4/A
Source: 0001104659-25-045103
Chunk: 374

Company: OLD SECOND BANCORP INC
Filing Date: 2025-05-06
Form: S-4/A
Chunk 374
---
 Association and Bylaws of Old Second Bank, each as in effect immediately prior to the Bank Merger, until the same shall be amended or changed as provided by law.

#### Section 9.
This Agreement shall terminate immediately and automatically without any further action on the part of Evergreen Bank or Old Second Bank, or any other person, upon the termination of the Merger Agreement.

#### Section 10.
The respective obligations of Evergreen Bank and Old Second Bank under this Agreement shall be conditioned upon (i) the prior consummation of the Merger in accordance with the Merger Agreement and (ii) this Agreement having been ratified and confirmed by the written consent of Old Second as the sole shareholder of Old Second Bank, and by the written consent of Bancorp Financial as the sole shareholder of Evergreen Bank, in each case as required by applicable law.

#### Section 11.
This Agreement may be executed in one or more counterparts, each of which shall be considered one and the same agreement and each of which shall be deemed an original.

#### Section 12.
It is the intention of the parties that the Bank Merger be treated for U.S. federal income tax purposes as a “reorganization” within the meaning of Section 368(a) of the Internal Revenue Code of 1986, as amended (the “

#### Code
”) and this Agreement is intended to be and is adopted as a plan of reorganization for purposes of Sections 354 and 361 of the Code.

<div align='center'>[ Signatures on Following Page ]

B-1-2</div>

TABLE OF CONTENTS

### WITNESS
, the signatures and seals of the merging banks as of the date first written above, each set by its [president and/or chief executive officer] attested to by its secretary, pursuant to a resolution of its board of directors.

### EVERGREEN BANK GROUP
By:

Name:

Title:

Attest:

Name:

Title: Secretary

<div align='center'>B-1-3</div>

TABLE OF CONTENTS

### OLD SECOND NATIONAL BANK
By:

Name:

Title:

Attest:

Name:

Title: Secretary

<div align='center'>B-1-4</div>

TABLE OF CONTENTS

### EXHIBIT C

### FORM OF EMPLOYMENT AGREEMENT

### EXECUTIVE EMPLOYMENT AGREEMENT
This EMPLOYMENT AGREEMENT (the “

#### Agreement
”) is entered into effective as of [ , 2025] (“

#### Effective Date